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Merge tag 'regmap-fix-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / drivers / media / v4l2-core / v4l2-ctrls.c
blob5cbe0ffbf501f126d77df0a2aab0d7c16b12d571
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 V4L2 controls framework implementation.
4
5 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
6
7 */
8
9 #define pr_fmt(fmt) "v4l2-ctrls: " fmt
10
11 #include <linux/ctype.h>
12 #include <linux/export.h>
13 #include <linux/mm.h>
14 #include <linux/slab.h>
15 #include <media/v4l2-ctrls.h>
16 #include <media/v4l2-dev.h>
17 #include <media/v4l2-device.h>
18 #include <media/v4l2-event.h>
19 #include <media/v4l2-fwnode.h>
20 #include <media/v4l2-ioctl.h>
21
22 #define dprintk(vdev, fmt, arg...) do { \
23 if (!WARN_ON(!(vdev)) && ((vdev)->dev_debug & V4L2_DEV_DEBUG_CTRL)) \
24 printk(KERN_DEBUG pr_fmt("%s: %s: " fmt), \
25 __func__, video_device_node_name(vdev), ##arg); \
26 } while (0)
27
28 #define has_op(master, op) \
29 (master->ops && master->ops->op)
30 #define call_op(master, op) \
31 (has_op(master, op) ? master->ops->op(master) : 0)
32
33 static const union v4l2_ctrl_ptr ptr_null;
34
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control ref corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl_ref *ref;
41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
43 u32 next;
44 };
45
46 /* Small helper function to determine if the autocluster is set to manual
47 mode. */
48 static bool is_cur_manual(const struct v4l2_ctrl *master)
49 {
50 return master->is_auto && master->cur.val == master->manual_mode_value;
51 }
52
53 /* Same as above, but this checks the against the new value instead of the
54 current value. */
55 static bool is_new_manual(const struct v4l2_ctrl *master)
56 {
57 return master->is_auto && master->val == master->manual_mode_value;
58 }
59
60 /* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
64 const char * const *v4l2_ctrl_get_menu(u32 id)
65 {
66 static const char * const mpeg_audio_sampling_freq[] = {
67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
72 static const char * const mpeg_audio_encoding[] = {
73 "MPEG-1/2 Layer I",
74 "MPEG-1/2 Layer II",
75 "MPEG-1/2 Layer III",
76 "MPEG-2/4 AAC",
77 "AC-3",
78 NULL
79 };
80 static const char * const mpeg_audio_l1_bitrate[] = {
81 "32 kbps",
82 "64 kbps",
83 "96 kbps",
84 "128 kbps",
85 "160 kbps",
86 "192 kbps",
87 "224 kbps",
88 "256 kbps",
89 "288 kbps",
90 "320 kbps",
91 "352 kbps",
92 "384 kbps",
93 "416 kbps",
94 "448 kbps",
95 NULL
96 };
97 static const char * const mpeg_audio_l2_bitrate[] = {
98 "32 kbps",
99 "48 kbps",
100 "56 kbps",
101 "64 kbps",
102 "80 kbps",
103 "96 kbps",
104 "112 kbps",
105 "128 kbps",
106 "160 kbps",
107 "192 kbps",
108 "224 kbps",
109 "256 kbps",
110 "320 kbps",
111 "384 kbps",
112 NULL
113 };
114 static const char * const mpeg_audio_l3_bitrate[] = {
115 "32 kbps",
116 "40 kbps",
117 "48 kbps",
118 "56 kbps",
119 "64 kbps",
120 "80 kbps",
121 "96 kbps",
122 "112 kbps",
123 "128 kbps",
124 "160 kbps",
125 "192 kbps",
126 "224 kbps",
127 "256 kbps",
128 "320 kbps",
129 NULL
130 };
131 static const char * const mpeg_audio_ac3_bitrate[] = {
132 "32 kbps",
133 "40 kbps",
134 "48 kbps",
135 "56 kbps",
136 "64 kbps",
137 "80 kbps",
138 "96 kbps",
139 "112 kbps",
140 "128 kbps",
141 "160 kbps",
142 "192 kbps",
143 "224 kbps",
144 "256 kbps",
145 "320 kbps",
146 "384 kbps",
147 "448 kbps",
148 "512 kbps",
149 "576 kbps",
150 "640 kbps",
151 NULL
152 };
153 static const char * const mpeg_audio_mode[] = {
154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
160 static const char * const mpeg_audio_mode_extension[] = {
161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
167 static const char * const mpeg_audio_emphasis[] = {
168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
173 static const char * const mpeg_audio_crc[] = {
174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
178 static const char * const mpeg_audio_dec_playback[] = {
179 "Auto",
180 "Stereo",
181 "Left",
182 "Right",
183 "Mono",
184 "Swapped Stereo",
185 NULL
186 };
187 static const char * const mpeg_video_encoding[] = {
188 "MPEG-1",
189 "MPEG-2",
190 "MPEG-4 AVC",
191 NULL
192 };
193 static const char * const mpeg_video_aspect[] = {
194 "1x1",
195 "4x3",
196 "16x9",
197 "2.21x1",
198 NULL
199 };
200 static const char * const mpeg_video_bitrate_mode[] = {
201 "Variable Bitrate",
202 "Constant Bitrate",
203 "Constant Quality",
204 NULL
205 };
206 static const char * const mpeg_stream_type[] = {
207 "MPEG-2 Program Stream",
208 "MPEG-2 Transport Stream",
209 "MPEG-1 System Stream",
210 "MPEG-2 DVD-compatible Stream",
211 "MPEG-1 VCD-compatible Stream",
212 "MPEG-2 SVCD-compatible Stream",
213 NULL
214 };
215 static const char * const mpeg_stream_vbi_fmt[] = {
216 "No VBI",
217 "Private Packet, IVTV Format",
218 NULL
219 };
220 static const char * const camera_power_line_frequency[] = {
221 "Disabled",
222 "50 Hz",
223 "60 Hz",
224 "Auto",
225 NULL
226 };
227 static const char * const camera_exposure_auto[] = {
228 "Auto Mode",
229 "Manual Mode",
230 "Shutter Priority Mode",
231 "Aperture Priority Mode",
232 NULL
233 };
234 static const char * const camera_exposure_metering[] = {
235 "Average",
236 "Center Weighted",
237 "Spot",
238 "Matrix",
239 NULL
240 };
241 static const char * const camera_auto_focus_range[] = {
242 "Auto",
243 "Normal",
244 "Macro",
245 "Infinity",
246 NULL
247 };
248 static const char * const colorfx[] = {
249 "None",
250 "Black & White",
251 "Sepia",
252 "Negative",
253 "Emboss",
254 "Sketch",
255 "Sky Blue",
256 "Grass Green",
257 "Skin Whiten",
258 "Vivid",
259 "Aqua",
260 "Art Freeze",
261 "Silhouette",
262 "Solarization",
263 "Antique",
264 "Set Cb/Cr",
265 NULL
266 };
267 static const char * const auto_n_preset_white_balance[] = {
268 "Manual",
269 "Auto",
270 "Incandescent",
271 "Fluorescent",
272 "Fluorescent H",
273 "Horizon",
274 "Daylight",
275 "Flash",
276 "Cloudy",
277 "Shade",
278 NULL,
279 };
280 static const char * const camera_iso_sensitivity_auto[] = {
281 "Manual",
282 "Auto",
283 NULL
284 };
285 static const char * const scene_mode[] = {
286 "None",
287 "Backlight",
288 "Beach/Snow",
289 "Candle Light",
290 "Dusk/Dawn",
291 "Fall Colors",
292 "Fireworks",
293 "Landscape",
294 "Night",
295 "Party/Indoor",
296 "Portrait",
297 "Sports",
298 "Sunset",
299 "Text",
300 NULL
301 };
302 static const char * const tune_emphasis[] = {
303 "None",
304 "50 Microseconds",
305 "75 Microseconds",
306 NULL,
307 };
308 static const char * const header_mode[] = {
309 "Separate Buffer",
310 "Joined With 1st Frame",
311 NULL,
312 };
313 static const char * const multi_slice[] = {
314 "Single",
315 "Max Macroblocks",
316 "Max Bytes",
317 NULL,
318 };
319 static const char * const entropy_mode[] = {
320 "CAVLC",
321 "CABAC",
322 NULL,
323 };
324 static const char * const mpeg_h264_level[] = {
325 "1",
326 "1b",
327 "1.1",
328 "1.2",
329 "1.3",
330 "2",
331 "2.1",
332 "2.2",
333 "3",
334 "3.1",
335 "3.2",
336 "4",
337 "4.1",
338 "4.2",
339 "5",
340 "5.1",
341 "5.2",
342 "6.0",
343 "6.1",
344 "6.2",
345 NULL,
346 };
347 static const char * const h264_loop_filter[] = {
348 "Enabled",
349 "Disabled",
350 "Disabled at Slice Boundary",
351 NULL,
352 };
353 static const char * const h264_profile[] = {
354 "Baseline",
355 "Constrained Baseline",
356 "Main",
357 "Extended",
358 "High",
359 "High 10",
360 "High 422",
361 "High 444 Predictive",
362 "High 10 Intra",
363 "High 422 Intra",
364 "High 444 Intra",
365 "CAVLC 444 Intra",
366 "Scalable Baseline",
367 "Scalable High",
368 "Scalable High Intra",
369 "Stereo High",
370 "Multiview High",
371 "Constrained High",
372 NULL,
373 };
374 static const char * const vui_sar_idc[] = {
375 "Unspecified",
376 "1:1",
377 "12:11",
378 "10:11",
379 "16:11",
380 "40:33",
381 "24:11",
382 "20:11",
383 "32:11",
384 "80:33",
385 "18:11",
386 "15:11",
387 "64:33",
388 "160:99",
389 "4:3",
390 "3:2",
391 "2:1",
392 "Extended SAR",
393 NULL,
394 };
395 static const char * const h264_fp_arrangement_type[] = {
396 "Checkerboard",
397 "Column",
398 "Row",
399 "Side by Side",
400 "Top Bottom",
401 "Temporal",
402 NULL,
403 };
404 static const char * const h264_fmo_map_type[] = {
405 "Interleaved Slices",
406 "Scattered Slices",
407 "Foreground with Leftover",
408 "Box Out",
409 "Raster Scan",
410 "Wipe Scan",
411 "Explicit",
412 NULL,
413 };
414 static const char * const h264_decode_mode[] = {
415 "Slice-Based",
416 "Frame-Based",
417 NULL,
418 };
419 static const char * const h264_start_code[] = {
420 "No Start Code",
421 "Annex B Start Code",
422 NULL,
423 };
424 static const char * const mpeg_mpeg2_level[] = {
425 "Low",
426 "Main",
427 "High 1440",
428 "High",
429 NULL,
430 };
431 static const char * const mpeg2_profile[] = {
432 "Simple",
433 "Main",
434 "SNR Scalable",
435 "Spatially Scalable",
436 "High",
437 NULL,
438 };
439 static const char * const mpeg_mpeg4_level[] = {
440 "0",
441 "0b",
442 "1",
443 "2",
444 "3",
445 "3b",
446 "4",
447 "5",
448 NULL,
449 };
450 static const char * const mpeg4_profile[] = {
451 "Simple",
452 "Advanced Simple",
453 "Core",
454 "Simple Scalable",
455 "Advanced Coding Efficiency",
456 NULL,
457 };
458
459 static const char * const vpx_golden_frame_sel[] = {
460 "Use Previous Frame",
461 "Use Previous Specific Frame",
462 NULL,
463 };
464 static const char * const vp8_profile[] = {
465 "0",
466 "1",
467 "2",
468 "3",
469 NULL,
470 };
471 static const char * const vp9_profile[] = {
472 "0",
473 "1",
474 "2",
475 "3",
476 NULL,
477 };
478 static const char * const vp9_level[] = {
479 "1",
480 "1.1",
481 "2",
482 "2.1",
483 "3",
484 "3.1",
485 "4",
486 "4.1",
487 "5",
488 "5.1",
489 "5.2",
490 "6",
491 "6.1",
492 "6.2",
493 NULL,
494 };
495
496 static const char * const flash_led_mode[] = {
497 "Off",
498 "Flash",
499 "Torch",
500 NULL,
501 };
502 static const char * const flash_strobe_source[] = {
503 "Software",
504 "External",
505 NULL,
506 };
507
508 static const char * const jpeg_chroma_subsampling[] = {
509 "4:4:4",
510 "4:2:2",
511 "4:2:0",
512 "4:1:1",
513 "4:1:0",
514 "Gray",
515 NULL,
516 };
517 static const char * const dv_tx_mode[] = {
518 "DVI-D",
519 "HDMI",
520 NULL,
521 };
522 static const char * const dv_rgb_range[] = {
523 "Automatic",
524 "RGB Limited Range (16-235)",
525 "RGB Full Range (0-255)",
526 NULL,
527 };
528 static const char * const dv_it_content_type[] = {
529 "Graphics",
530 "Photo",
531 "Cinema",
532 "Game",
533 "No IT Content",
534 NULL,
535 };
536 static const char * const detect_md_mode[] = {
537 "Disabled",
538 "Global",
539 "Threshold Grid",
540 "Region Grid",
541 NULL,
542 };
543
544 static const char * const hevc_profile[] = {
545 "Main",
546 "Main Still Picture",
547 "Main 10",
548 NULL,
549 };
550 static const char * const hevc_level[] = {
551 "1",
552 "2",
553 "2.1",
554 "3",
555 "3.1",
556 "4",
557 "4.1",
558 "5",
559 "5.1",
560 "5.2",
561 "6",
562 "6.1",
563 "6.2",
564 NULL,
565 };
566 static const char * const hevc_hierarchial_coding_type[] = {
567 "B",
568 "P",
569 NULL,
570 };
571 static const char * const hevc_refresh_type[] = {
572 "None",
573 "CRA",
574 "IDR",
575 NULL,
576 };
577 static const char * const hevc_size_of_length_field[] = {
578 "0",
579 "1",
580 "2",
581 "4",
582 NULL,
583 };
584 static const char * const hevc_tier[] = {
585 "Main",
586 "High",
587 NULL,
588 };
589 static const char * const hevc_loop_filter_mode[] = {
590 "Disabled",
591 "Enabled",
592 "Disabled at slice boundary",
593 "NULL",
594 };
595 static const char * const hevc_decode_mode[] = {
596 "Slice-Based",
597 "Frame-Based",
598 NULL,
599 };
600 static const char * const hevc_start_code[] = {
601 "No Start Code",
602 "Annex B Start Code",
603 NULL,
604 };
605 static const char * const camera_orientation[] = {
606 "Front",
607 "Back",
608 "External",
609 NULL,
610 };
611 static const char * const mpeg_video_frame_skip[] = {
612 "Disabled",
613 "Level Limit",
614 "VBV/CPB Limit",
615 NULL,
616 };
617
618 switch (id) {
619 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
620 return mpeg_audio_sampling_freq;
621 case V4L2_CID_MPEG_AUDIO_ENCODING:
622 return mpeg_audio_encoding;
623 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
624 return mpeg_audio_l1_bitrate;
625 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
626 return mpeg_audio_l2_bitrate;
627 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
628 return mpeg_audio_l3_bitrate;
629 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
630 return mpeg_audio_ac3_bitrate;
631 case V4L2_CID_MPEG_AUDIO_MODE:
632 return mpeg_audio_mode;
633 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
634 return mpeg_audio_mode_extension;
635 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
636 return mpeg_audio_emphasis;
637 case V4L2_CID_MPEG_AUDIO_CRC:
638 return mpeg_audio_crc;
639 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
640 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
641 return mpeg_audio_dec_playback;
642 case V4L2_CID_MPEG_VIDEO_ENCODING:
643 return mpeg_video_encoding;
644 case V4L2_CID_MPEG_VIDEO_ASPECT:
645 return mpeg_video_aspect;
646 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
647 return mpeg_video_bitrate_mode;
648 case V4L2_CID_MPEG_STREAM_TYPE:
649 return mpeg_stream_type;
650 case V4L2_CID_MPEG_STREAM_VBI_FMT:
651 return mpeg_stream_vbi_fmt;
652 case V4L2_CID_POWER_LINE_FREQUENCY:
653 return camera_power_line_frequency;
654 case V4L2_CID_EXPOSURE_AUTO:
655 return camera_exposure_auto;
656 case V4L2_CID_EXPOSURE_METERING:
657 return camera_exposure_metering;
658 case V4L2_CID_AUTO_FOCUS_RANGE:
659 return camera_auto_focus_range;
660 case V4L2_CID_COLORFX:
661 return colorfx;
662 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
663 return auto_n_preset_white_balance;
664 case V4L2_CID_ISO_SENSITIVITY_AUTO:
665 return camera_iso_sensitivity_auto;
666 case V4L2_CID_SCENE_MODE:
667 return scene_mode;
668 case V4L2_CID_TUNE_PREEMPHASIS:
669 return tune_emphasis;
670 case V4L2_CID_TUNE_DEEMPHASIS:
671 return tune_emphasis;
672 case V4L2_CID_FLASH_LED_MODE:
673 return flash_led_mode;
674 case V4L2_CID_FLASH_STROBE_SOURCE:
675 return flash_strobe_source;
676 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
677 return header_mode;
678 case V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE:
679 return mpeg_video_frame_skip;
680 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
681 return multi_slice;
682 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
683 return entropy_mode;
684 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
685 return mpeg_h264_level;
686 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
687 return h264_loop_filter;
688 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
689 return h264_profile;
690 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
691 return vui_sar_idc;
692 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
693 return h264_fp_arrangement_type;
694 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
695 return h264_fmo_map_type;
696 case V4L2_CID_STATELESS_H264_DECODE_MODE:
697 return h264_decode_mode;
698 case V4L2_CID_STATELESS_H264_START_CODE:
699 return h264_start_code;
700 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
701 return mpeg_mpeg2_level;
702 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
703 return mpeg2_profile;
704 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
705 return mpeg_mpeg4_level;
706 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
707 return mpeg4_profile;
708 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
709 return vpx_golden_frame_sel;
710 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
711 return vp8_profile;
712 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
713 return vp9_profile;
714 case V4L2_CID_MPEG_VIDEO_VP9_LEVEL:
715 return vp9_level;
716 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
717 return jpeg_chroma_subsampling;
718 case V4L2_CID_DV_TX_MODE:
719 return dv_tx_mode;
720 case V4L2_CID_DV_TX_RGB_RANGE:
721 case V4L2_CID_DV_RX_RGB_RANGE:
722 return dv_rgb_range;
723 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
724 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
725 return dv_it_content_type;
726 case V4L2_CID_DETECT_MD_MODE:
727 return detect_md_mode;
728 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
729 return hevc_profile;
730 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
731 return hevc_level;
732 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
733 return hevc_hierarchial_coding_type;
734 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
735 return hevc_refresh_type;
736 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
737 return hevc_size_of_length_field;
738 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
739 return hevc_tier;
740 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
741 return hevc_loop_filter_mode;
742 case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE:
743 return hevc_decode_mode;
744 case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE:
745 return hevc_start_code;
746 case V4L2_CID_CAMERA_ORIENTATION:
747 return camera_orientation;
748 default:
749 return NULL;
750 }
751 }
752 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
753
754 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
755 /*
756 * Returns NULL or an s64 type array containing the menu for given
757 * control ID. The total number of the menu items is returned in @len.
758 */
759 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
760 {
761 static const s64 qmenu_int_vpx_num_partitions[] = {
762 1, 2, 4, 8,
763 };
764
765 static const s64 qmenu_int_vpx_num_ref_frames[] = {
766 1, 2, 3,
767 };
768
769 switch (id) {
770 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
771 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
772 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
773 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
774 default:
775 *len = 0;
776 return NULL;
777 }
778 }
779 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
780
781 /* Return the control name. */
782 const char *v4l2_ctrl_get_name(u32 id)
783 {
784 switch (id) {
785 /* USER controls */
786 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
787 case V4L2_CID_USER_CLASS: return "User Controls";
788 case V4L2_CID_BRIGHTNESS: return "Brightness";
789 case V4L2_CID_CONTRAST: return "Contrast";
790 case V4L2_CID_SATURATION: return "Saturation";
791 case V4L2_CID_HUE: return "Hue";
792 case V4L2_CID_AUDIO_VOLUME: return "Volume";
793 case V4L2_CID_AUDIO_BALANCE: return "Balance";
794 case V4L2_CID_AUDIO_BASS: return "Bass";
795 case V4L2_CID_AUDIO_TREBLE: return "Treble";
796 case V4L2_CID_AUDIO_MUTE: return "Mute";
797 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
798 case V4L2_CID_BLACK_LEVEL: return "Black Level";
799 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
800 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
801 case V4L2_CID_RED_BALANCE: return "Red Balance";
802 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
803 case V4L2_CID_GAMMA: return "Gamma";
804 case V4L2_CID_EXPOSURE: return "Exposure";
805 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
806 case V4L2_CID_GAIN: return "Gain";
807 case V4L2_CID_HFLIP: return "Horizontal Flip";
808 case V4L2_CID_VFLIP: return "Vertical Flip";
809 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
810 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
811 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
812 case V4L2_CID_SHARPNESS: return "Sharpness";
813 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
814 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
815 case V4L2_CID_COLOR_KILLER: return "Color Killer";
816 case V4L2_CID_COLORFX: return "Color Effects";
817 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
818 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
819 case V4L2_CID_ROTATE: return "Rotate";
820 case V4L2_CID_BG_COLOR: return "Background Color";
821 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
822 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
823 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
824 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
825 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
826 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
827 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
828
829 /* Codec controls */
830 /* The MPEG controls are applicable to all codec controls
831 * and the 'MPEG' part of the define is historical */
832 /* Keep the order of the 'case's the same as in videodev2.h! */
833 case V4L2_CID_CODEC_CLASS: return "Codec Controls";
834 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
835 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
836 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
837 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
838 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
839 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
840 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
841 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
842 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
843 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
844 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
845 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
846 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
847 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
848 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
849 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
850 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
851 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
852 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
853 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
854 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
855 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
856 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
857 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
858 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
859 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
860 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
861 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
862 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
863 case V4L2_CID_MPEG_VIDEO_CONSTANT_QUALITY: return "Constant Quality";
864 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
865 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
866 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
867 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
868 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
869 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
870 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
871 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
872 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
873 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
874 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
875 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
876 case V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE: return "Frame Skip Mode";
877 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
878 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
879 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
880 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
881 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
882 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
883 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
884 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
885 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
886 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
887 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
888 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
889 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
890 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
891 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
892 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
893 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
894 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
895 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
896 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
897 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
898 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
899 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
900 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
901 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
902 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
903 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
904 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
905 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
906 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
907 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
908 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
909 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
910 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
911 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
912 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
913 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
914 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
915 return "H264 Set QP Value for HC Layers";
916 case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
917 return "H264 Constrained Intra Pred";
918 case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET: return "H264 Chroma QP Index Offset";
919 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP: return "H264 I-Frame Minimum QP Value";
920 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP: return "H264 I-Frame Maximum QP Value";
921 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP: return "H264 P-Frame Minimum QP Value";
922 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP: return "H264 P-Frame Maximum QP Value";
923 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL: return "MPEG2 Level";
924 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE: return "MPEG2 Profile";
925 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
926 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
927 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
928 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
929 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
930 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
931 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
932 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
933 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
934 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
935 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
936 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
937 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
938 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
939 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
940 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
941 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
942 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
943 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
944 case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS: return "MPEG-2 Slice Parameters";
945 case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION: return "MPEG-2 Quantization Matrices";
946 case V4L2_CID_FWHT_I_FRAME_QP: return "FWHT I-Frame QP Value";
947 case V4L2_CID_FWHT_P_FRAME_QP: return "FWHT P-Frame QP Value";
948
949 /* VPX controls */
950 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
951 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
952 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
953 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
954 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
955 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
956 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
957 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
958 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
959 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
960 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
961 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE: return "VP8 Profile";
962 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE: return "VP9 Profile";
963 case V4L2_CID_MPEG_VIDEO_VP9_LEVEL: return "VP9 Level";
964 case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER: return "VP8 Frame Header";
965
966 /* HEVC controls */
967 case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP: return "HEVC I-Frame QP Value";
968 case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP: return "HEVC P-Frame QP Value";
969 case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP: return "HEVC B-Frame QP Value";
970 case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP: return "HEVC Minimum QP Value";
971 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP: return "HEVC Maximum QP Value";
972 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE: return "HEVC Profile";
973 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL: return "HEVC Level";
974 case V4L2_CID_MPEG_VIDEO_HEVC_TIER: return "HEVC Tier";
975 case V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION: return "HEVC Frame Rate Resolution";
976 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH: return "HEVC Maximum Coding Unit Depth";
977 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE: return "HEVC Refresh Type";
978 case V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED: return "HEVC Constant Intra Prediction";
979 case V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU: return "HEVC Lossless Encoding";
980 case V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT: return "HEVC Wavefront";
981 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE: return "HEVC Loop Filter";
982 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP: return "HEVC QP Values";
983 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE: return "HEVC Hierarchical Coding Type";
984 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER: return "HEVC Hierarchical Coding Layer";
985 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP: return "HEVC Hierarchical Layer 0 QP";
986 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP: return "HEVC Hierarchical Layer 1 QP";
987 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP: return "HEVC Hierarchical Layer 2 QP";
988 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP: return "HEVC Hierarchical Layer 3 QP";
989 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP: return "HEVC Hierarchical Layer 4 QP";
990 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP: return "HEVC Hierarchical Layer 5 QP";
991 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP: return "HEVC Hierarchical Layer 6 QP";
992 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR: return "HEVC Hierarchical Lay 0 BitRate";
993 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR: return "HEVC Hierarchical Lay 1 BitRate";
994 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR: return "HEVC Hierarchical Lay 2 BitRate";
995 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR: return "HEVC Hierarchical Lay 3 BitRate";
996 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR: return "HEVC Hierarchical Lay 4 BitRate";
997 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR: return "HEVC Hierarchical Lay 5 BitRate";
998 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR: return "HEVC Hierarchical Lay 6 BitRate";
999 case V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB: return "HEVC General PB";
1000 case V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID: return "HEVC Temporal ID";
1001 case V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING: return "HEVC Strong Intra Smoothing";
1002 case V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT: return "HEVC Intra PU Split";
1003 case V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION: return "HEVC TMV Prediction";
1004 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1: return "HEVC Max Num of Candidate MVs";
1005 case V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE: return "HEVC ENC Without Startcode";
1006 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD: return "HEVC Num of I-Frame b/w 2 IDR";
1007 case V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2: return "HEVC Loop Filter Beta Offset";
1008 case V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2: return "HEVC Loop Filter TC Offset";
1009 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD: return "HEVC Size of Length Field";
1010 case V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES: return "Reference Frames for a P-Frame";
1011 case V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR: return "Prepend SPS and PPS to IDR";
1012 case V4L2_CID_MPEG_VIDEO_HEVC_SPS: return "HEVC Sequence Parameter Set";
1013 case V4L2_CID_MPEG_VIDEO_HEVC_PPS: return "HEVC Picture Parameter Set";
1014 case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS: return "HEVC Slice Parameters";
1015 case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE: return "HEVC Decode Mode";
1016 case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE: return "HEVC Start Code";
1017
1018 /* CAMERA controls */
1019 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1020 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
1021 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
1022 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
1023 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
1024 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
1025 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
1026 case V4L2_CID_PAN_RESET: return "Pan, Reset";
1027 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
1028 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
1029 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
1030 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
1031 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
1032 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
1033 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
1034 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
1035 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
1036 case V4L2_CID_PRIVACY: return "Privacy";
1037 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
1038 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
1039 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
1040 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
1041 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
1042 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
1043 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
1044 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
1045 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
1046 case V4L2_CID_SCENE_MODE: return "Scene Mode";
1047 case V4L2_CID_3A_LOCK: return "3A Lock";
1048 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
1049 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
1050 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
1051 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
1052 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
1053 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
1054 case V4L2_CID_UNIT_CELL_SIZE: return "Unit Cell Size";
1055 case V4L2_CID_CAMERA_ORIENTATION: return "Camera Orientation";
1056 case V4L2_CID_CAMERA_SENSOR_ROTATION: return "Camera Sensor Rotation";
1057
1058 /* FM Radio Modulator controls */
1059 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1060 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
1061 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
1062 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
1063 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
1064 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
1065 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
1066 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
1067 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
1068 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
1069 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
1070 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1071 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
1072 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
1073 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
1074 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
1075 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
1076 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
1077 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
1078 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
1079 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
1080 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
1081 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
1082 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
1083 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
1084 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
1085 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
1086 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
1087 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
1088 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
1089
1090 /* Flash controls */
1091 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1092 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
1093 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
1094 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
1095 case V4L2_CID_FLASH_STROBE: return "Strobe";
1096 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
1097 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
1098 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
1099 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
1100 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
1101 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
1102 case V4L2_CID_FLASH_FAULT: return "Faults";
1103 case V4L2_CID_FLASH_CHARGE: return "Charge";
1104 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
1105
1106 /* JPEG encoder controls */
1107 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1108 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
1109 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
1110 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
1111 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
1112 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
1113
1114 /* Image source controls */
1115 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1116 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
1117 case V4L2_CID_VBLANK: return "Vertical Blanking";
1118 case V4L2_CID_HBLANK: return "Horizontal Blanking";
1119 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
1120 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
1121 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
1122 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
1123 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
1124
1125 /* Image processing controls */
1126 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1127 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
1128 case V4L2_CID_LINK_FREQ: return "Link Frequency";
1129 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
1130 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
1131 case V4L2_CID_DEINTERLACING_MODE: return "Deinterlacing Mode";
1132 case V4L2_CID_DIGITAL_GAIN: return "Digital Gain";
1133
1134 /* DV controls */
1135 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1136 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
1137 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
1138 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
1139 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
1140 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
1141 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
1142 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
1143 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
1144 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
1145 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
1146
1147 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
1148 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
1149 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
1150 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
1151 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
1152 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
1153 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
1154 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
1155 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
1156 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
1157 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
1158 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
1159 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
1160 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
1161 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
1162 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
1163 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
1164 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1165 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
1166 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
1167
1168 /* Detection controls */
1169 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1170 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
1171 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
1172 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
1173 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
1174 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
1175
1176 /* Stateless Codec controls */
1177 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1178 case V4L2_CID_CODEC_STATELESS_CLASS: return "Stateless Codec Controls";
1179 case V4L2_CID_STATELESS_H264_DECODE_MODE: return "H264 Decode Mode";
1180 case V4L2_CID_STATELESS_H264_START_CODE: return "H264 Start Code";
1181 case V4L2_CID_STATELESS_H264_SPS: return "H264 Sequence Parameter Set";
1182 case V4L2_CID_STATELESS_H264_PPS: return "H264 Picture Parameter Set";
1183 case V4L2_CID_STATELESS_H264_SCALING_MATRIX: return "H264 Scaling Matrix";
1184 case V4L2_CID_STATELESS_H264_PRED_WEIGHTS: return "H264 Prediction Weight Table";
1185 case V4L2_CID_STATELESS_H264_SLICE_PARAMS: return "H264 Slice Parameters";
1186 case V4L2_CID_STATELESS_H264_DECODE_PARAMS: return "H264 Decode Parameters";
1187 case V4L2_CID_STATELESS_FWHT_PARAMS: return "FWHT Stateless Parameters";
1188 default:
1189 return NULL;
1190 }
1191 }
1192 EXPORT_SYMBOL(v4l2_ctrl_get_name);
1193
1194 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
1195 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
1196 {
1197 *name = v4l2_ctrl_get_name(id);
1198 *flags = 0;
1199
1200 switch (id) {
1201 case V4L2_CID_AUDIO_MUTE:
1202 case V4L2_CID_AUDIO_LOUDNESS:
1203 case V4L2_CID_AUTO_WHITE_BALANCE:
1204 case V4L2_CID_AUTOGAIN:
1205 case V4L2_CID_HFLIP:
1206 case V4L2_CID_VFLIP:
1207 case V4L2_CID_HUE_AUTO:
1208 case V4L2_CID_CHROMA_AGC:
1209 case V4L2_CID_COLOR_KILLER:
1210 case V4L2_CID_AUTOBRIGHTNESS:
1211 case V4L2_CID_MPEG_AUDIO_MUTE:
1212 case V4L2_CID_MPEG_VIDEO_MUTE:
1213 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
1214 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
1215 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
1216 case V4L2_CID_FOCUS_AUTO:
1217 case V4L2_CID_PRIVACY:
1218 case V4L2_CID_AUDIO_LIMITER_ENABLED:
1219 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
1220 case V4L2_CID_PILOT_TONE_ENABLED:
1221 case V4L2_CID_ILLUMINATORS_1:
1222 case V4L2_CID_ILLUMINATORS_2:
1223 case V4L2_CID_FLASH_STROBE_STATUS:
1224 case V4L2_CID_FLASH_CHARGE:
1225 case V4L2_CID_FLASH_READY:
1226 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
1227 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
1228 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
1229 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
1230 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
1231 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
1232 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
1233 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
1234 case V4L2_CID_WIDE_DYNAMIC_RANGE:
1235 case V4L2_CID_IMAGE_STABILIZATION:
1236 case V4L2_CID_RDS_RECEPTION:
1237 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
1238 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
1239 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
1240 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
1241 case V4L2_CID_RF_TUNER_PLL_LOCK:
1242 case V4L2_CID_RDS_TX_MONO_STEREO:
1243 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
1244 case V4L2_CID_RDS_TX_COMPRESSED:
1245 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
1246 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
1247 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
1248 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
1249 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
1250 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1251 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1252 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1253 *type = V4L2_CTRL_TYPE_BOOLEAN;
1254 *min = 0;
1255 *max = *step = 1;
1256 break;
1257 case V4L2_CID_ROTATE:
1258 *type = V4L2_CTRL_TYPE_INTEGER;
1259 *flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
1260 break;
1261 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1262 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1263 *type = V4L2_CTRL_TYPE_INTEGER;
1264 break;
1265 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1266 case V4L2_CID_PAN_RESET:
1267 case V4L2_CID_TILT_RESET:
1268 case V4L2_CID_FLASH_STROBE:
1269 case V4L2_CID_FLASH_STROBE_STOP:
1270 case V4L2_CID_AUTO_FOCUS_START:
1271 case V4L2_CID_AUTO_FOCUS_STOP:
1272 case V4L2_CID_DO_WHITE_BALANCE:
1273 *type = V4L2_CTRL_TYPE_BUTTON;
1274 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1275 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1276 *min = *max = *step = *def = 0;
1277 break;
1278 case V4L2_CID_POWER_LINE_FREQUENCY:
1279 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1280 case V4L2_CID_MPEG_AUDIO_ENCODING:
1281 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1282 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1283 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1284 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1285 case V4L2_CID_MPEG_AUDIO_MODE:
1286 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1287 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1288 case V4L2_CID_MPEG_AUDIO_CRC:
1289 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1290 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1291 case V4L2_CID_MPEG_VIDEO_ENCODING:
1292 case V4L2_CID_MPEG_VIDEO_ASPECT:
1293 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1294 case V4L2_CID_MPEG_STREAM_TYPE:
1295 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1296 case V4L2_CID_EXPOSURE_AUTO:
1297 case V4L2_CID_AUTO_FOCUS_RANGE:
1298 case V4L2_CID_COLORFX:
1299 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1300 case V4L2_CID_TUNE_PREEMPHASIS:
1301 case V4L2_CID_FLASH_LED_MODE:
1302 case V4L2_CID_FLASH_STROBE_SOURCE:
1303 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1304 case V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE:
1305 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1306 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1307 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1308 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1309 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1310 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1311 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1312 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1313 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
1314 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
1315 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1316 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1317 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1318 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1319 case V4L2_CID_EXPOSURE_METERING:
1320 case V4L2_CID_SCENE_MODE:
1321 case V4L2_CID_DV_TX_MODE:
1322 case V4L2_CID_DV_TX_RGB_RANGE:
1323 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1324 case V4L2_CID_DV_RX_RGB_RANGE:
1325 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1326 case V4L2_CID_TEST_PATTERN:
1327 case V4L2_CID_DEINTERLACING_MODE:
1328 case V4L2_CID_TUNE_DEEMPHASIS:
1329 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1330 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
1331 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
1332 case V4L2_CID_MPEG_VIDEO_VP9_LEVEL:
1333 case V4L2_CID_DETECT_MD_MODE:
1334 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
1335 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
1336 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
1337 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
1338 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
1339 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
1340 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
1341 case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE:
1342 case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE:
1343 case V4L2_CID_STATELESS_H264_DECODE_MODE:
1344 case V4L2_CID_STATELESS_H264_START_CODE:
1345 case V4L2_CID_CAMERA_ORIENTATION:
1346 *type = V4L2_CTRL_TYPE_MENU;
1347 break;
1348 case V4L2_CID_LINK_FREQ:
1349 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1350 break;
1351 case V4L2_CID_RDS_TX_PS_NAME:
1352 case V4L2_CID_RDS_TX_RADIO_TEXT:
1353 case V4L2_CID_RDS_RX_PS_NAME:
1354 case V4L2_CID_RDS_RX_RADIO_TEXT:
1355 *type = V4L2_CTRL_TYPE_STRING;
1356 break;
1357 case V4L2_CID_ISO_SENSITIVITY:
1358 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1359 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1360 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1361 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1362 break;
1363 case V4L2_CID_USER_CLASS:
1364 case V4L2_CID_CAMERA_CLASS:
1365 case V4L2_CID_CODEC_CLASS:
1366 case V4L2_CID_FM_TX_CLASS:
1367 case V4L2_CID_FLASH_CLASS:
1368 case V4L2_CID_JPEG_CLASS:
1369 case V4L2_CID_IMAGE_SOURCE_CLASS:
1370 case V4L2_CID_IMAGE_PROC_CLASS:
1371 case V4L2_CID_DV_CLASS:
1372 case V4L2_CID_FM_RX_CLASS:
1373 case V4L2_CID_RF_TUNER_CLASS:
1374 case V4L2_CID_DETECT_CLASS:
1375 case V4L2_CID_CODEC_STATELESS_CLASS:
1376 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1377 /* You can neither read not write these */
1378 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1379 *min = *max = *step = *def = 0;
1380 break;
1381 case V4L2_CID_BG_COLOR:
1382 *type = V4L2_CTRL_TYPE_INTEGER;
1383 *step = 1;
1384 *min = 0;
1385 /* Max is calculated as RGB888 that is 2^24 */
1386 *max = 0xFFFFFF;
1387 break;
1388 case V4L2_CID_FLASH_FAULT:
1389 case V4L2_CID_JPEG_ACTIVE_MARKER:
1390 case V4L2_CID_3A_LOCK:
1391 case V4L2_CID_AUTO_FOCUS_STATUS:
1392 case V4L2_CID_DV_TX_HOTPLUG:
1393 case V4L2_CID_DV_TX_RXSENSE:
1394 case V4L2_CID_DV_TX_EDID_PRESENT:
1395 case V4L2_CID_DV_RX_POWER_PRESENT:
1396 *type = V4L2_CTRL_TYPE_BITMASK;
1397 break;
1398 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1399 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1400 *type = V4L2_CTRL_TYPE_INTEGER;
1401 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1402 break;
1403 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1404 *type = V4L2_CTRL_TYPE_INTEGER64;
1405 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1406 *min = *def = 0;
1407 *max = 0x1ffffffffLL;
1408 *step = 1;
1409 break;
1410 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1411 *type = V4L2_CTRL_TYPE_INTEGER64;
1412 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1413 *min = *def = 0;
1414 *max = 0x7fffffffffffffffLL;
1415 *step = 1;
1416 break;
1417 case V4L2_CID_PIXEL_RATE:
1418 *type = V4L2_CTRL_TYPE_INTEGER64;
1419 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1420 break;
1421 case V4L2_CID_DETECT_MD_REGION_GRID:
1422 *type = V4L2_CTRL_TYPE_U8;
1423 break;
1424 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1425 *type = V4L2_CTRL_TYPE_U16;
1426 break;
1427 case V4L2_CID_RDS_TX_ALT_FREQS:
1428 *type = V4L2_CTRL_TYPE_U32;
1429 break;
1430 case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:
1431 *type = V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS;
1432 break;
1433 case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:
1434 *type = V4L2_CTRL_TYPE_MPEG2_QUANTIZATION;
1435 break;
1436 case V4L2_CID_STATELESS_FWHT_PARAMS:
1437 *type = V4L2_CTRL_TYPE_FWHT_PARAMS;
1438 break;
1439 case V4L2_CID_STATELESS_H264_SPS:
1440 *type = V4L2_CTRL_TYPE_H264_SPS;
1441 break;
1442 case V4L2_CID_STATELESS_H264_PPS:
1443 *type = V4L2_CTRL_TYPE_H264_PPS;
1444 break;
1445 case V4L2_CID_STATELESS_H264_SCALING_MATRIX:
1446 *type = V4L2_CTRL_TYPE_H264_SCALING_MATRIX;
1447 break;
1448 case V4L2_CID_STATELESS_H264_SLICE_PARAMS:
1449 *type = V4L2_CTRL_TYPE_H264_SLICE_PARAMS;
1450 break;
1451 case V4L2_CID_STATELESS_H264_DECODE_PARAMS:
1452 *type = V4L2_CTRL_TYPE_H264_DECODE_PARAMS;
1453 break;
1454 case V4L2_CID_STATELESS_H264_PRED_WEIGHTS:
1455 *type = V4L2_CTRL_TYPE_H264_PRED_WEIGHTS;
1456 break;
1457 case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER:
1458 *type = V4L2_CTRL_TYPE_VP8_FRAME_HEADER;
1459 break;
1460 case V4L2_CID_MPEG_VIDEO_HEVC_SPS:
1461 *type = V4L2_CTRL_TYPE_HEVC_SPS;
1462 break;
1463 case V4L2_CID_MPEG_VIDEO_HEVC_PPS:
1464 *type = V4L2_CTRL_TYPE_HEVC_PPS;
1465 break;
1466 case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:
1467 *type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
1468 break;
1469 case V4L2_CID_UNIT_CELL_SIZE:
1470 *type = V4L2_CTRL_TYPE_AREA;
1471 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1472 break;
1473 default:
1474 *type = V4L2_CTRL_TYPE_INTEGER;
1475 break;
1476 }
1477 switch (id) {
1478 case V4L2_CID_MPEG_AUDIO_ENCODING:
1479 case V4L2_CID_MPEG_AUDIO_MODE:
1480 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1481 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1482 case V4L2_CID_MPEG_STREAM_TYPE:
1483 *flags |= V4L2_CTRL_FLAG_UPDATE;
1484 break;
1485 case V4L2_CID_AUDIO_VOLUME:
1486 case V4L2_CID_AUDIO_BALANCE:
1487 case V4L2_CID_AUDIO_BASS:
1488 case V4L2_CID_AUDIO_TREBLE:
1489 case V4L2_CID_BRIGHTNESS:
1490 case V4L2_CID_CONTRAST:
1491 case V4L2_CID_SATURATION:
1492 case V4L2_CID_HUE:
1493 case V4L2_CID_RED_BALANCE:
1494 case V4L2_CID_BLUE_BALANCE:
1495 case V4L2_CID_GAMMA:
1496 case V4L2_CID_SHARPNESS:
1497 case V4L2_CID_CHROMA_GAIN:
1498 case V4L2_CID_RDS_TX_DEVIATION:
1499 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1500 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1501 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1502 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1503 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1504 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1505 case V4L2_CID_PILOT_TONE_DEVIATION:
1506 case V4L2_CID_PILOT_TONE_FREQUENCY:
1507 case V4L2_CID_TUNE_POWER_LEVEL:
1508 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1509 case V4L2_CID_RF_TUNER_RF_GAIN:
1510 case V4L2_CID_RF_TUNER_LNA_GAIN:
1511 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1512 case V4L2_CID_RF_TUNER_IF_GAIN:
1513 case V4L2_CID_RF_TUNER_BANDWIDTH:
1514 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1515 *flags |= V4L2_CTRL_FLAG_SLIDER;
1516 break;
1517 case V4L2_CID_PAN_RELATIVE:
1518 case V4L2_CID_TILT_RELATIVE:
1519 case V4L2_CID_FOCUS_RELATIVE:
1520 case V4L2_CID_IRIS_RELATIVE:
1521 case V4L2_CID_ZOOM_RELATIVE:
1522 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1523 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1524 break;
1525 case V4L2_CID_FLASH_STROBE_STATUS:
1526 case V4L2_CID_AUTO_FOCUS_STATUS:
1527 case V4L2_CID_FLASH_READY:
1528 case V4L2_CID_DV_TX_HOTPLUG:
1529 case V4L2_CID_DV_TX_RXSENSE:
1530 case V4L2_CID_DV_TX_EDID_PRESENT:
1531 case V4L2_CID_DV_RX_POWER_PRESENT:
1532 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1533 case V4L2_CID_RDS_RX_PTY:
1534 case V4L2_CID_RDS_RX_PS_NAME:
1535 case V4L2_CID_RDS_RX_RADIO_TEXT:
1536 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1537 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1538 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1539 case V4L2_CID_CAMERA_ORIENTATION:
1540 case V4L2_CID_CAMERA_SENSOR_ROTATION:
1541 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1542 break;
1543 case V4L2_CID_RF_TUNER_PLL_LOCK:
1544 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1545 break;
1546 }
1547 }
1548 EXPORT_SYMBOL(v4l2_ctrl_fill);
1549
1550 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1551 {
1552 u32 flags = ctrl->flags;
1553
1554 if (ctrl->is_ptr)
1555 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1556
1557 return flags;
1558 }
1559
1560 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1561 {
1562 memset(ev, 0, sizeof(*ev));
1563 ev->type = V4L2_EVENT_CTRL;
1564 ev->id = ctrl->id;
1565 ev->u.ctrl.changes = changes;
1566 ev->u.ctrl.type = ctrl->type;
1567 ev->u.ctrl.flags = user_flags(ctrl);
1568 if (ctrl->is_ptr)
1569 ev->u.ctrl.value64 = 0;
1570 else
1571 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1572 ev->u.ctrl.minimum = ctrl->minimum;
1573 ev->u.ctrl.maximum = ctrl->maximum;
1574 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1575 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1576 ev->u.ctrl.step = 1;
1577 else
1578 ev->u.ctrl.step = ctrl->step;
1579 ev->u.ctrl.default_value = ctrl->default_value;
1580 }
1581
1582 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1583 {
1584 struct v4l2_event ev;
1585 struct v4l2_subscribed_event *sev;
1586
1587 if (list_empty(&ctrl->ev_subs))
1588 return;
1589 fill_event(&ev, ctrl, changes);
1590
1591 list_for_each_entry(sev, &ctrl->ev_subs, node)
1592 if (sev->fh != fh ||
1593 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1594 v4l2_event_queue_fh(sev->fh, &ev);
1595 }
1596
1597 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1598 union v4l2_ctrl_ptr ptr1,
1599 union v4l2_ctrl_ptr ptr2)
1600 {
1601 switch (ctrl->type) {
1602 case V4L2_CTRL_TYPE_BUTTON:
1603 return false;
1604 case V4L2_CTRL_TYPE_STRING:
1605 idx *= ctrl->elem_size;
1606 /* strings are always 0-terminated */
1607 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1608 case V4L2_CTRL_TYPE_INTEGER64:
1609 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1610 case V4L2_CTRL_TYPE_U8:
1611 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1612 case V4L2_CTRL_TYPE_U16:
1613 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1614 case V4L2_CTRL_TYPE_U32:
1615 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1616 default:
1617 if (ctrl->is_int)
1618 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1619 idx *= ctrl->elem_size;
1620 return !memcmp(ptr1.p_const + idx, ptr2.p_const + idx,
1621 ctrl->elem_size);
1622 }
1623 }
1624
1625 static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx,
1626 union v4l2_ctrl_ptr ptr)
1627 {
1628 struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1629 struct v4l2_ctrl_vp8_frame_header *p_vp8_frame_header;
1630 struct v4l2_ctrl_fwht_params *p_fwht_params;
1631 void *p = ptr.p + idx * ctrl->elem_size;
1632
1633 if (ctrl->p_def.p_const)
1634 memcpy(p, ctrl->p_def.p_const, ctrl->elem_size);
1635 else
1636 memset(p, 0, ctrl->elem_size);
1637
1638 /*
1639 * The cast is needed to get rid of a gcc warning complaining that
1640 * V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS is not part of the
1641 * v4l2_ctrl_type enum.
1642 */
1643 switch ((u32)ctrl->type) {
1644 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1645 p_mpeg2_slice_params = p;
1646 /* 4:2:0 */
1647 p_mpeg2_slice_params->sequence.chroma_format = 1;
1648 /* interlaced top field */
1649 p_mpeg2_slice_params->picture.picture_structure = 1;
1650 p_mpeg2_slice_params->picture.picture_coding_type =
1651 V4L2_MPEG2_PICTURE_CODING_TYPE_I;
1652 break;
1653 case V4L2_CTRL_TYPE_VP8_FRAME_HEADER:
1654 p_vp8_frame_header = p;
1655 p_vp8_frame_header->num_dct_parts = 1;
1656 break;
1657 case V4L2_CTRL_TYPE_FWHT_PARAMS:
1658 p_fwht_params = p;
1659 p_fwht_params->version = V4L2_FWHT_VERSION;
1660 p_fwht_params->width = 1280;
1661 p_fwht_params->height = 720;
1662 break;
1663 }
1664 }
1665
1666 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1667 union v4l2_ctrl_ptr ptr)
1668 {
1669 switch (ctrl->type) {
1670 case V4L2_CTRL_TYPE_STRING:
1671 idx *= ctrl->elem_size;
1672 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1673 ptr.p_char[idx + ctrl->minimum] = '\0';
1674 break;
1675 case V4L2_CTRL_TYPE_INTEGER64:
1676 ptr.p_s64[idx] = ctrl->default_value;
1677 break;
1678 case V4L2_CTRL_TYPE_INTEGER:
1679 case V4L2_CTRL_TYPE_INTEGER_MENU:
1680 case V4L2_CTRL_TYPE_MENU:
1681 case V4L2_CTRL_TYPE_BITMASK:
1682 case V4L2_CTRL_TYPE_BOOLEAN:
1683 ptr.p_s32[idx] = ctrl->default_value;
1684 break;
1685 case V4L2_CTRL_TYPE_BUTTON:
1686 case V4L2_CTRL_TYPE_CTRL_CLASS:
1687 ptr.p_s32[idx] = 0;
1688 break;
1689 case V4L2_CTRL_TYPE_U8:
1690 ptr.p_u8[idx] = ctrl->default_value;
1691 break;
1692 case V4L2_CTRL_TYPE_U16:
1693 ptr.p_u16[idx] = ctrl->default_value;
1694 break;
1695 case V4L2_CTRL_TYPE_U32:
1696 ptr.p_u32[idx] = ctrl->default_value;
1697 break;
1698 default:
1699 std_init_compound(ctrl, idx, ptr);
1700 break;
1701 }
1702 }
1703
1704 static void std_log(const struct v4l2_ctrl *ctrl)
1705 {
1706 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1707
1708 if (ctrl->is_array) {
1709 unsigned i;
1710
1711 for (i = 0; i < ctrl->nr_of_dims; i++)
1712 pr_cont("[%u]", ctrl->dims[i]);
1713 pr_cont(" ");
1714 }
1715
1716 switch (ctrl->type) {
1717 case V4L2_CTRL_TYPE_INTEGER:
1718 pr_cont("%d", *ptr.p_s32);
1719 break;
1720 case V4L2_CTRL_TYPE_BOOLEAN:
1721 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1722 break;
1723 case V4L2_CTRL_TYPE_MENU:
1724 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1725 break;
1726 case V4L2_CTRL_TYPE_INTEGER_MENU:
1727 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1728 break;
1729 case V4L2_CTRL_TYPE_BITMASK:
1730 pr_cont("0x%08x", *ptr.p_s32);
1731 break;
1732 case V4L2_CTRL_TYPE_INTEGER64:
1733 pr_cont("%lld", *ptr.p_s64);
1734 break;
1735 case V4L2_CTRL_TYPE_STRING:
1736 pr_cont("%s", ptr.p_char);
1737 break;
1738 case V4L2_CTRL_TYPE_U8:
1739 pr_cont("%u", (unsigned)*ptr.p_u8);
1740 break;
1741 case V4L2_CTRL_TYPE_U16:
1742 pr_cont("%u", (unsigned)*ptr.p_u16);
1743 break;
1744 case V4L2_CTRL_TYPE_U32:
1745 pr_cont("%u", (unsigned)*ptr.p_u32);
1746 break;
1747 case V4L2_CTRL_TYPE_H264_SPS:
1748 pr_cont("H264_SPS");
1749 break;
1750 case V4L2_CTRL_TYPE_H264_PPS:
1751 pr_cont("H264_PPS");
1752 break;
1753 case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
1754 pr_cont("H264_SCALING_MATRIX");
1755 break;
1756 case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
1757 pr_cont("H264_SLICE_PARAMS");
1758 break;
1759 case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
1760 pr_cont("H264_DECODE_PARAMS");
1761 break;
1762 case V4L2_CTRL_TYPE_H264_PRED_WEIGHTS:
1763 pr_cont("H264_PRED_WEIGHTS");
1764 break;
1765 case V4L2_CTRL_TYPE_FWHT_PARAMS:
1766 pr_cont("FWHT_PARAMS");
1767 break;
1768 default:
1769 pr_cont("unknown type %d", ctrl->type);
1770 break;
1771 }
1772 }
1773
1774 /*
1775 * Round towards the closest legal value. Be careful when we are
1776 * close to the maximum range of the control type to prevent
1777 * wrap-arounds.
1778 */
1779 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1780 ({ \
1781 offset_type offset; \
1782 if ((ctrl)->maximum >= 0 && \
1783 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1784 val = (ctrl)->maximum; \
1785 else \
1786 val += (s32)((ctrl)->step / 2); \
1787 val = clamp_t(typeof(val), val, \
1788 (ctrl)->minimum, (ctrl)->maximum); \
1789 offset = (val) - (ctrl)->minimum; \
1790 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1791 val = (ctrl)->minimum + offset; \
1792 0; \
1793 })
1794
1795 /* Validate a new control */
1796
1797 #define zero_padding(s) \
1798 memset(&(s).padding, 0, sizeof((s).padding))
1799 #define zero_reserved(s) \
1800 memset(&(s).reserved, 0, sizeof((s).reserved))
1801
1802 /*
1803 * Compound controls validation requires setting unused fields/flags to zero
1804 * in order to properly detect unchanged controls with std_equal's memcmp.
1805 */
1806 static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
1807 union v4l2_ctrl_ptr ptr)
1808 {
1809 struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1810 struct v4l2_ctrl_vp8_frame_header *p_vp8_frame_header;
1811 struct v4l2_ctrl_fwht_params *p_fwht_params;
1812 struct v4l2_ctrl_h264_sps *p_h264_sps;
1813 struct v4l2_ctrl_h264_pps *p_h264_pps;
1814 struct v4l2_ctrl_h264_pred_weights *p_h264_pred_weights;
1815 struct v4l2_ctrl_h264_slice_params *p_h264_slice_params;
1816 struct v4l2_ctrl_h264_decode_params *p_h264_dec_params;
1817 struct v4l2_ctrl_hevc_sps *p_hevc_sps;
1818 struct v4l2_ctrl_hevc_pps *p_hevc_pps;
1819 struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
1820 struct v4l2_area *area;
1821 void *p = ptr.p + idx * ctrl->elem_size;
1822 unsigned int i;
1823
1824 switch ((u32)ctrl->type) {
1825 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1826 p_mpeg2_slice_params = p;
1827
1828 switch (p_mpeg2_slice_params->sequence.chroma_format) {
1829 case 1: /* 4:2:0 */
1830 case 2: /* 4:2:2 */
1831 case 3: /* 4:4:4 */
1832 break;
1833 default:
1834 return -EINVAL;
1835 }
1836
1837 switch (p_mpeg2_slice_params->picture.intra_dc_precision) {
1838 case 0: /* 8 bits */
1839 case 1: /* 9 bits */
1840 case 2: /* 10 bits */
1841 case 3: /* 11 bits */
1842 break;
1843 default:
1844 return -EINVAL;
1845 }
1846
1847 switch (p_mpeg2_slice_params->picture.picture_structure) {
1848 case 1: /* interlaced top field */
1849 case 2: /* interlaced bottom field */
1850 case 3: /* progressive */
1851 break;
1852 default:
1853 return -EINVAL;
1854 }
1855
1856 switch (p_mpeg2_slice_params->picture.picture_coding_type) {
1857 case V4L2_MPEG2_PICTURE_CODING_TYPE_I:
1858 case V4L2_MPEG2_PICTURE_CODING_TYPE_P:
1859 case V4L2_MPEG2_PICTURE_CODING_TYPE_B:
1860 break;
1861 default:
1862 return -EINVAL;
1863 }
1864
1865 break;
1866
1867 case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
1868 break;
1869
1870 case V4L2_CTRL_TYPE_FWHT_PARAMS:
1871 p_fwht_params = p;
1872 if (p_fwht_params->version < V4L2_FWHT_VERSION)
1873 return -EINVAL;
1874 if (!p_fwht_params->width || !p_fwht_params->height)
1875 return -EINVAL;
1876 break;
1877
1878 case V4L2_CTRL_TYPE_H264_SPS:
1879 p_h264_sps = p;
1880
1881 /* Some syntax elements are only conditionally valid */
1882 if (p_h264_sps->pic_order_cnt_type != 0) {
1883 p_h264_sps->log2_max_pic_order_cnt_lsb_minus4 = 0;
1884 } else if (p_h264_sps->pic_order_cnt_type != 1) {
1885 p_h264_sps->num_ref_frames_in_pic_order_cnt_cycle = 0;
1886 p_h264_sps->offset_for_non_ref_pic = 0;
1887 p_h264_sps->offset_for_top_to_bottom_field = 0;
1888 memset(&p_h264_sps->offset_for_ref_frame, 0,
1889 sizeof(p_h264_sps->offset_for_ref_frame));
1890 }
1891
1892 if (!V4L2_H264_SPS_HAS_CHROMA_FORMAT(p_h264_sps)) {
1893 p_h264_sps->chroma_format_idc = 1;
1894 p_h264_sps->bit_depth_luma_minus8 = 0;
1895 p_h264_sps->bit_depth_chroma_minus8 = 0;
1896
1897 p_h264_sps->flags &=
1898 ~V4L2_H264_SPS_FLAG_QPPRIME_Y_ZERO_TRANSFORM_BYPASS;
1899
1900 if (p_h264_sps->chroma_format_idc < 3)
1901 p_h264_sps->flags &=
1902 ~V4L2_H264_SPS_FLAG_SEPARATE_COLOUR_PLANE;
1903 }
1904
1905 if (p_h264_sps->flags & V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY)
1906 p_h264_sps->flags &=
1907 ~V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD;
1908
1909 /*
1910 * Chroma 4:2:2 format require at least High 4:2:2 profile.
1911 *
1912 * The H264 specification and well-known parser implementations
1913 * use profile-idc values directly, as that is clearer and
1914 * less ambiguous. We do the same here.
1915 */
1916 if (p_h264_sps->profile_idc < 122 &&
1917 p_h264_sps->chroma_format_idc > 1)
1918 return -EINVAL;
1919 /* Chroma 4:4:4 format require at least High 4:2:2 profile */
1920 if (p_h264_sps->profile_idc < 244 &&
1921 p_h264_sps->chroma_format_idc > 2)
1922 return -EINVAL;
1923 if (p_h264_sps->chroma_format_idc > 3)
1924 return -EINVAL;
1925
1926 if (p_h264_sps->bit_depth_luma_minus8 > 6)
1927 return -EINVAL;
1928 if (p_h264_sps->bit_depth_chroma_minus8 > 6)
1929 return -EINVAL;
1930 if (p_h264_sps->log2_max_frame_num_minus4 > 12)
1931 return -EINVAL;
1932 if (p_h264_sps->pic_order_cnt_type > 2)
1933 return -EINVAL;
1934 if (p_h264_sps->log2_max_pic_order_cnt_lsb_minus4 > 12)
1935 return -EINVAL;
1936 if (p_h264_sps->max_num_ref_frames > V4L2_H264_REF_LIST_LEN)
1937 return -EINVAL;
1938 break;
1939
1940 case V4L2_CTRL_TYPE_H264_PPS:
1941 p_h264_pps = p;
1942
1943 if (p_h264_pps->num_slice_groups_minus1 > 7)
1944 return -EINVAL;
1945 if (p_h264_pps->num_ref_idx_l0_default_active_minus1 >
1946 (V4L2_H264_REF_LIST_LEN - 1))
1947 return -EINVAL;
1948 if (p_h264_pps->num_ref_idx_l1_default_active_minus1 >
1949 (V4L2_H264_REF_LIST_LEN - 1))
1950 return -EINVAL;
1951 if (p_h264_pps->weighted_bipred_idc > 2)
1952 return -EINVAL;
1953 /*
1954 * pic_init_qp_minus26 shall be in the range of
1955 * -(26 + QpBdOffset_y) to +25, inclusive,
1956 * where QpBdOffset_y is 6 * bit_depth_luma_minus8
1957 */
1958 if (p_h264_pps->pic_init_qp_minus26 < -62 ||
1959 p_h264_pps->pic_init_qp_minus26 > 25)
1960 return -EINVAL;
1961 if (p_h264_pps->pic_init_qs_minus26 < -26 ||
1962 p_h264_pps->pic_init_qs_minus26 > 25)
1963 return -EINVAL;
1964 if (p_h264_pps->chroma_qp_index_offset < -12 ||
1965 p_h264_pps->chroma_qp_index_offset > 12)
1966 return -EINVAL;
1967 if (p_h264_pps->second_chroma_qp_index_offset < -12 ||
1968 p_h264_pps->second_chroma_qp_index_offset > 12)
1969 return -EINVAL;
1970 break;
1971
1972 case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
1973 break;
1974
1975 case V4L2_CTRL_TYPE_H264_PRED_WEIGHTS:
1976 p_h264_pred_weights = p;
1977
1978 if (p_h264_pred_weights->luma_log2_weight_denom > 7)
1979 return -EINVAL;
1980 if (p_h264_pred_weights->chroma_log2_weight_denom > 7)
1981 return -EINVAL;
1982 break;
1983
1984 case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
1985 p_h264_slice_params = p;
1986
1987 if (p_h264_slice_params->slice_type != V4L2_H264_SLICE_TYPE_B)
1988 p_h264_slice_params->flags &=
1989 ~V4L2_H264_SLICE_FLAG_DIRECT_SPATIAL_MV_PRED;
1990
1991 if (p_h264_slice_params->colour_plane_id > 2)
1992 return -EINVAL;
1993 if (p_h264_slice_params->cabac_init_idc > 2)
1994 return -EINVAL;
1995 if (p_h264_slice_params->disable_deblocking_filter_idc > 2)
1996 return -EINVAL;
1997 if (p_h264_slice_params->slice_alpha_c0_offset_div2 < -6 ||
1998 p_h264_slice_params->slice_alpha_c0_offset_div2 > 6)
1999 return -EINVAL;
2000 if (p_h264_slice_params->slice_beta_offset_div2 < -6 ||
2001 p_h264_slice_params->slice_beta_offset_div2 > 6)
2002 return -EINVAL;
2003
2004 if (p_h264_slice_params->slice_type == V4L2_H264_SLICE_TYPE_I ||
2005 p_h264_slice_params->slice_type == V4L2_H264_SLICE_TYPE_SI)
2006 p_h264_slice_params->num_ref_idx_l0_active_minus1 = 0;
2007 if (p_h264_slice_params->slice_type != V4L2_H264_SLICE_TYPE_B)
2008 p_h264_slice_params->num_ref_idx_l1_active_minus1 = 0;
2009
2010 if (p_h264_slice_params->num_ref_idx_l0_active_minus1 >
2011 (V4L2_H264_REF_LIST_LEN - 1))
2012 return -EINVAL;
2013 if (p_h264_slice_params->num_ref_idx_l1_active_minus1 >
2014 (V4L2_H264_REF_LIST_LEN - 1))
2015 return -EINVAL;
2016 zero_reserved(*p_h264_slice_params);
2017 break;
2018
2019 case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
2020 p_h264_dec_params = p;
2021
2022 if (p_h264_dec_params->nal_ref_idc > 3)
2023 return -EINVAL;
2024 for (i = 0; i < V4L2_H264_NUM_DPB_ENTRIES; i++) {
2025 struct v4l2_h264_dpb_entry *dpb_entry =
2026 &p_h264_dec_params->dpb[i];
2027
2028 zero_reserved(*dpb_entry);
2029 }
2030 zero_reserved(*p_h264_dec_params);
2031 break;
2032
2033 case V4L2_CTRL_TYPE_VP8_FRAME_HEADER:
2034 p_vp8_frame_header = p;
2035
2036 switch (p_vp8_frame_header->num_dct_parts) {
2037 case 1:
2038 case 2:
2039 case 4:
2040 case 8:
2041 break;
2042 default:
2043 return -EINVAL;
2044 }
2045 zero_padding(p_vp8_frame_header->segment_header);
2046 zero_padding(p_vp8_frame_header->lf_header);
2047 zero_padding(p_vp8_frame_header->quant_header);
2048 zero_padding(p_vp8_frame_header->entropy_header);
2049 zero_padding(p_vp8_frame_header->coder_state);
2050 break;
2051
2052 case V4L2_CTRL_TYPE_HEVC_SPS:
2053 p_hevc_sps = p;
2054
2055 if (!(p_hevc_sps->flags & V4L2_HEVC_SPS_FLAG_PCM_ENABLED)) {
2056 p_hevc_sps->pcm_sample_bit_depth_luma_minus1 = 0;
2057 p_hevc_sps->pcm_sample_bit_depth_chroma_minus1 = 0;
2058 p_hevc_sps->log2_min_pcm_luma_coding_block_size_minus3 = 0;
2059 p_hevc_sps->log2_diff_max_min_pcm_luma_coding_block_size = 0;
2060 }
2061
2062 if (!(p_hevc_sps->flags &
2063 V4L2_HEVC_SPS_FLAG_LONG_TERM_REF_PICS_PRESENT))
2064 p_hevc_sps->num_long_term_ref_pics_sps = 0;
2065 break;
2066
2067 case V4L2_CTRL_TYPE_HEVC_PPS:
2068 p_hevc_pps = p;
2069
2070 if (!(p_hevc_pps->flags &
2071 V4L2_HEVC_PPS_FLAG_CU_QP_DELTA_ENABLED))
2072 p_hevc_pps->diff_cu_qp_delta_depth = 0;
2073
2074 if (!(p_hevc_pps->flags & V4L2_HEVC_PPS_FLAG_TILES_ENABLED)) {
2075 p_hevc_pps->num_tile_columns_minus1 = 0;
2076 p_hevc_pps->num_tile_rows_minus1 = 0;
2077 memset(&p_hevc_pps->column_width_minus1, 0,
2078 sizeof(p_hevc_pps->column_width_minus1));
2079 memset(&p_hevc_pps->row_height_minus1, 0,
2080 sizeof(p_hevc_pps->row_height_minus1));
2081
2082 p_hevc_pps->flags &=
2083 ~V4L2_HEVC_PPS_FLAG_LOOP_FILTER_ACROSS_TILES_ENABLED;
2084 }
2085
2086 if (p_hevc_pps->flags &
2087 V4L2_HEVC_PPS_FLAG_PPS_DISABLE_DEBLOCKING_FILTER) {
2088 p_hevc_pps->pps_beta_offset_div2 = 0;
2089 p_hevc_pps->pps_tc_offset_div2 = 0;
2090 }
2091
2092 zero_padding(*p_hevc_pps);
2093 break;
2094
2095 case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
2096 p_hevc_slice_params = p;
2097
2098 if (p_hevc_slice_params->num_active_dpb_entries >
2099 V4L2_HEVC_DPB_ENTRIES_NUM_MAX)
2100 return -EINVAL;
2101
2102 zero_padding(p_hevc_slice_params->pred_weight_table);
2103
2104 for (i = 0; i < p_hevc_slice_params->num_active_dpb_entries;
2105 i++) {
2106 struct v4l2_hevc_dpb_entry *dpb_entry =
2107 &p_hevc_slice_params->dpb[i];
2108
2109 zero_padding(*dpb_entry);
2110 }
2111
2112 zero_padding(*p_hevc_slice_params);
2113 break;
2114
2115 case V4L2_CTRL_TYPE_AREA:
2116 area = p;
2117 if (!area->width || !area->height)
2118 return -EINVAL;
2119 break;
2120
2121 default:
2122 return -EINVAL;
2123 }
2124
2125 return 0;
2126 }
2127
2128 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
2129 union v4l2_ctrl_ptr ptr)
2130 {
2131 size_t len;
2132 u64 offset;
2133 s64 val;
2134
2135 switch ((u32)ctrl->type) {
2136 case V4L2_CTRL_TYPE_INTEGER:
2137 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
2138 case V4L2_CTRL_TYPE_INTEGER64:
2139 /*
2140 * We can't use the ROUND_TO_RANGE define here due to
2141 * the u64 divide that needs special care.
2142 */
2143 val = ptr.p_s64[idx];
2144 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
2145 val = ctrl->maximum;
2146 else
2147 val += (s64)(ctrl->step / 2);
2148 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
2149 offset = val - ctrl->minimum;
2150 do_div(offset, ctrl->step);
2151 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
2152 return 0;
2153 case V4L2_CTRL_TYPE_U8:
2154 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
2155 case V4L2_CTRL_TYPE_U16:
2156 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
2157 case V4L2_CTRL_TYPE_U32:
2158 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
2159
2160 case V4L2_CTRL_TYPE_BOOLEAN:
2161 ptr.p_s32[idx] = !!ptr.p_s32[idx];
2162 return 0;
2163
2164 case V4L2_CTRL_TYPE_MENU:
2165 case V4L2_CTRL_TYPE_INTEGER_MENU:
2166 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
2167 return -ERANGE;
2168 if (ctrl->menu_skip_mask & (1ULL << ptr.p_s32[idx]))
2169 return -EINVAL;
2170 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
2171 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
2172 return -EINVAL;
2173 return 0;
2174
2175 case V4L2_CTRL_TYPE_BITMASK:
2176 ptr.p_s32[idx] &= ctrl->maximum;
2177 return 0;
2178
2179 case V4L2_CTRL_TYPE_BUTTON:
2180 case V4L2_CTRL_TYPE_CTRL_CLASS:
2181 ptr.p_s32[idx] = 0;
2182 return 0;
2183
2184 case V4L2_CTRL_TYPE_STRING:
2185 idx *= ctrl->elem_size;
2186 len = strlen(ptr.p_char + idx);
2187 if (len < ctrl->minimum)
2188 return -ERANGE;
2189 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
2190 return -ERANGE;
2191 return 0;
2192
2193 default:
2194 return std_validate_compound(ctrl, idx, ptr);
2195 }
2196 }
2197
2198 static const struct v4l2_ctrl_type_ops std_type_ops = {
2199 .equal = std_equal,
2200 .init = std_init,
2201 .log = std_log,
2202 .validate = std_validate,
2203 };
2204
2205 /* Helper function: copy the given control value back to the caller */
2206 static int ptr_to_user(struct v4l2_ext_control *c,
2207 struct v4l2_ctrl *ctrl,
2208 union v4l2_ctrl_ptr ptr)
2209 {
2210 u32 len;
2211
2212 if (ctrl->is_ptr && !ctrl->is_string)
2213 return copy_to_user(c->ptr, ptr.p_const, c->size) ?
2214 -EFAULT : 0;
2215
2216 switch (ctrl->type) {
2217 case V4L2_CTRL_TYPE_STRING:
2218 len = strlen(ptr.p_char);
2219 if (c->size < len + 1) {
2220 c->size = ctrl->elem_size;
2221 return -ENOSPC;
2222 }
2223 return copy_to_user(c->string, ptr.p_char, len + 1) ?
2224 -EFAULT : 0;
2225 case V4L2_CTRL_TYPE_INTEGER64:
2226 c->value64 = *ptr.p_s64;
2227 break;
2228 default:
2229 c->value = *ptr.p_s32;
2230 break;
2231 }
2232 return 0;
2233 }
2234
2235 /* Helper function: copy the current control value back to the caller */
2236 static int cur_to_user(struct v4l2_ext_control *c,
2237 struct v4l2_ctrl *ctrl)
2238 {
2239 return ptr_to_user(c, ctrl, ctrl->p_cur);
2240 }
2241
2242 /* Helper function: copy the new control value back to the caller */
2243 static int new_to_user(struct v4l2_ext_control *c,
2244 struct v4l2_ctrl *ctrl)
2245 {
2246 return ptr_to_user(c, ctrl, ctrl->p_new);
2247 }
2248
2249 /* Helper function: copy the request value back to the caller */
2250 static int req_to_user(struct v4l2_ext_control *c,
2251 struct v4l2_ctrl_ref *ref)
2252 {
2253 return ptr_to_user(c, ref->ctrl, ref->p_req);
2254 }
2255
2256 /* Helper function: copy the initial control value back to the caller */
2257 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
2258 {
2259 int idx;
2260
2261 for (idx = 0; idx < ctrl->elems; idx++)
2262 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2263
2264 return ptr_to_user(c, ctrl, ctrl->p_new);
2265 }
2266
2267 /* Helper function: copy the caller-provider value to the given control value */
2268 static int user_to_ptr(struct v4l2_ext_control *c,
2269 struct v4l2_ctrl *ctrl,
2270 union v4l2_ctrl_ptr ptr)
2271 {
2272 int ret;
2273 u32 size;
2274
2275 ctrl->is_new = 1;
2276 if (ctrl->is_ptr && !ctrl->is_string) {
2277 unsigned idx;
2278
2279 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
2280 if (ret || !ctrl->is_array)
2281 return ret;
2282 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
2283 ctrl->type_ops->init(ctrl, idx, ptr);
2284 return 0;
2285 }
2286
2287 switch (ctrl->type) {
2288 case V4L2_CTRL_TYPE_INTEGER64:
2289 *ptr.p_s64 = c->value64;
2290 break;
2291 case V4L2_CTRL_TYPE_STRING:
2292 size = c->size;
2293 if (size == 0)
2294 return -ERANGE;
2295 if (size > ctrl->maximum + 1)
2296 size = ctrl->maximum + 1;
2297 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
2298 if (!ret) {
2299 char last = ptr.p_char[size - 1];
2300
2301 ptr.p_char[size - 1] = 0;
2302 /* If the string was longer than ctrl->maximum,
2303 then return an error. */
2304 if (strlen(ptr.p_char) == ctrl->maximum && last)
2305 return -ERANGE;
2306 }
2307 return ret;
2308 default:
2309 *ptr.p_s32 = c->value;
2310 break;
2311 }
2312 return 0;
2313 }
2314
2315 /* Helper function: copy the caller-provider value as the new control value */
2316 static int user_to_new(struct v4l2_ext_control *c,
2317 struct v4l2_ctrl *ctrl)
2318 {
2319 return user_to_ptr(c, ctrl, ctrl->p_new);
2320 }
2321
2322 /* Copy the one value to another. */
2323 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
2324 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
2325 {
2326 if (ctrl == NULL)
2327 return;
2328 memcpy(to.p, from.p_const, ctrl->elems * ctrl->elem_size);
2329 }
2330
2331 /* Copy the new value to the current value. */
2332 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
2333 {
2334 bool changed;
2335
2336 if (ctrl == NULL)
2337 return;
2338
2339 /* has_changed is set by cluster_changed */
2340 changed = ctrl->has_changed;
2341 if (changed)
2342 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
2343
2344 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
2345 /* Note: CH_FLAGS is only set for auto clusters. */
2346 ctrl->flags &=
2347 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
2348 if (!is_cur_manual(ctrl->cluster[0])) {
2349 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
2350 if (ctrl->cluster[0]->has_volatiles)
2351 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
2352 }
2353 fh = NULL;
2354 }
2355 if (changed || ch_flags) {
2356 /* If a control was changed that was not one of the controls
2357 modified by the application, then send the event to all. */
2358 if (!ctrl->is_new)
2359 fh = NULL;
2360 send_event(fh, ctrl,
2361 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
2362 if (ctrl->call_notify && changed && ctrl->handler->notify)
2363 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
2364 }
2365 }
2366
2367 /* Copy the current value to the new value */
2368 static void cur_to_new(struct v4l2_ctrl *ctrl)
2369 {
2370 if (ctrl == NULL)
2371 return;
2372 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
2373 }
2374
2375 /* Copy the new value to the request value */
2376 static void new_to_req(struct v4l2_ctrl_ref *ref)
2377 {
2378 if (!ref)
2379 return;
2380 ptr_to_ptr(ref->ctrl, ref->ctrl->p_new, ref->p_req);
2381 ref->req = ref;
2382 }
2383
2384 /* Copy the request value to the new value */
2385 static void req_to_new(struct v4l2_ctrl_ref *ref)
2386 {
2387 if (!ref)
2388 return;
2389 if (ref->req)
2390 ptr_to_ptr(ref->ctrl, ref->req->p_req, ref->ctrl->p_new);
2391 else
2392 ptr_to_ptr(ref->ctrl, ref->ctrl->p_cur, ref->ctrl->p_new);
2393 }
2394
2395 /* Return non-zero if one or more of the controls in the cluster has a new
2396 value that differs from the current value. */
2397 static int cluster_changed(struct v4l2_ctrl *master)
2398 {
2399 bool changed = false;
2400 unsigned idx;
2401 int i;
2402
2403 for (i = 0; i < master->ncontrols; i++) {
2404 struct v4l2_ctrl *ctrl = master->cluster[i];
2405 bool ctrl_changed = false;
2406
2407 if (ctrl == NULL)
2408 continue;
2409
2410 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
2411 changed = ctrl_changed = true;
2412
2413 /*
2414 * Set has_changed to false to avoid generating
2415 * the event V4L2_EVENT_CTRL_CH_VALUE
2416 */
2417 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2418 ctrl->has_changed = false;
2419 continue;
2420 }
2421
2422 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
2423 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
2424 ctrl->p_cur, ctrl->p_new);
2425 ctrl->has_changed = ctrl_changed;
2426 changed |= ctrl->has_changed;
2427 }
2428 return changed;
2429 }
2430
2431 /* Control range checking */
2432 static int check_range(enum v4l2_ctrl_type type,
2433 s64 min, s64 max, u64 step, s64 def)
2434 {
2435 switch (type) {
2436 case V4L2_CTRL_TYPE_BOOLEAN:
2437 if (step != 1 || max > 1 || min < 0)
2438 return -ERANGE;
2439 fallthrough;
2440 case V4L2_CTRL_TYPE_U8:
2441 case V4L2_CTRL_TYPE_U16:
2442 case V4L2_CTRL_TYPE_U32:
2443 case V4L2_CTRL_TYPE_INTEGER:
2444 case V4L2_CTRL_TYPE_INTEGER64:
2445 if (step == 0 || min > max || def < min || def > max)
2446 return -ERANGE;
2447 return 0;
2448 case V4L2_CTRL_TYPE_BITMASK:
2449 if (step || min || !max || (def & ~max))
2450 return -ERANGE;
2451 return 0;
2452 case V4L2_CTRL_TYPE_MENU:
2453 case V4L2_CTRL_TYPE_INTEGER_MENU:
2454 if (min > max || def < min || def > max)
2455 return -ERANGE;
2456 /* Note: step == menu_skip_mask for menu controls.
2457 So here we check if the default value is masked out. */
2458 if (step && ((1 << def) & step))
2459 return -EINVAL;
2460 return 0;
2461 case V4L2_CTRL_TYPE_STRING:
2462 if (min > max || min < 0 || step < 1 || def)
2463 return -ERANGE;
2464 return 0;
2465 default:
2466 return 0;
2467 }
2468 }
2469
2470 /* Validate a new control */
2471 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
2472 {
2473 unsigned idx;
2474 int err = 0;
2475
2476 for (idx = 0; !err && idx < ctrl->elems; idx++)
2477 err = ctrl->type_ops->validate(ctrl, idx, p_new);
2478 return err;
2479 }
2480
2481 static inline u32 node2id(struct list_head *node)
2482 {
2483 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
2484 }
2485
2486 /* Set the handler's error code if it wasn't set earlier already */
2487 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
2488 {
2489 if (hdl->error == 0)
2490 hdl->error = err;
2491 return err;
2492 }
2493
2494 /* Initialize the handler */
2495 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
2496 unsigned nr_of_controls_hint,
2497 struct lock_class_key *key, const char *name)
2498 {
2499 mutex_init(&hdl->_lock);
2500 hdl->lock = &hdl->_lock;
2501 lockdep_set_class_and_name(hdl->lock, key, name);
2502 INIT_LIST_HEAD(&hdl->ctrls);
2503 INIT_LIST_HEAD(&hdl->ctrl_refs);
2504 INIT_LIST_HEAD(&hdl->requests);
2505 INIT_LIST_HEAD(&hdl->requests_queued);
2506 hdl->request_is_queued = false;
2507 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
2508 hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
2509 sizeof(hdl->buckets[0]),
2510 GFP_KERNEL | __GFP_ZERO);
2511 hdl->error = hdl->buckets ? 0 : -ENOMEM;
2512 media_request_object_init(&hdl->req_obj);
2513 return hdl->error;
2514 }
2515 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
2516
2517 /* Free all controls and control refs */
2518 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
2519 {
2520 struct v4l2_ctrl_ref *ref, *next_ref;
2521 struct v4l2_ctrl *ctrl, *next_ctrl;
2522 struct v4l2_subscribed_event *sev, *next_sev;
2523
2524 if (hdl == NULL || hdl->buckets == NULL)
2525 return;
2526
2527 if (!hdl->req_obj.req && !list_empty(&hdl->requests)) {
2528 struct v4l2_ctrl_handler *req, *next_req;
2529
2530 list_for_each_entry_safe(req, next_req, &hdl->requests, requests) {
2531 media_request_object_unbind(&req->req_obj);
2532 media_request_object_put(&req->req_obj);
2533 }
2534 }
2535 mutex_lock(hdl->lock);
2536 /* Free all nodes */
2537 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
2538 list_del(&ref->node);
2539 kfree(ref);
2540 }
2541 /* Free all controls owned by the handler */
2542 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
2543 list_del(&ctrl->node);
2544 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
2545 list_del(&sev->node);
2546 kvfree(ctrl);
2547 }
2548 kvfree(hdl->buckets);
2549 hdl->buckets = NULL;
2550 hdl->cached = NULL;
2551 hdl->error = 0;
2552 mutex_unlock(hdl->lock);
2553 mutex_destroy(&hdl->_lock);
2554 }
2555 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
2556
2557 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
2558 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
2559 with applications that do not use the NEXT_CTRL flag.
2560
2561 We just find the n-th private user control. It's O(N), but that should not
2562 be an issue in this particular case. */
2563 static struct v4l2_ctrl_ref *find_private_ref(
2564 struct v4l2_ctrl_handler *hdl, u32 id)
2565 {
2566 struct v4l2_ctrl_ref *ref;
2567
2568 id -= V4L2_CID_PRIVATE_BASE;
2569 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2570 /* Search for private user controls that are compatible with
2571 VIDIOC_G/S_CTRL. */
2572 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
2573 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
2574 if (!ref->ctrl->is_int)
2575 continue;
2576 if (id == 0)
2577 return ref;
2578 id--;
2579 }
2580 }
2581 return NULL;
2582 }
2583
2584 /* Find a control with the given ID. */
2585 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
2586 {
2587 struct v4l2_ctrl_ref *ref;
2588 int bucket;
2589
2590 id &= V4L2_CTRL_ID_MASK;
2591
2592 /* Old-style private controls need special handling */
2593 if (id >= V4L2_CID_PRIVATE_BASE)
2594 return find_private_ref(hdl, id);
2595 bucket = id % hdl->nr_of_buckets;
2596
2597 /* Simple optimization: cache the last control found */
2598 if (hdl->cached && hdl->cached->ctrl->id == id)
2599 return hdl->cached;
2600
2601 /* Not in cache, search the hash */
2602 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
2603 while (ref && ref->ctrl->id != id)
2604 ref = ref->next;
2605
2606 if (ref)
2607 hdl->cached = ref; /* cache it! */
2608 return ref;
2609 }
2610
2611 /* Find a control with the given ID. Take the handler's lock first. */
2612 static struct v4l2_ctrl_ref *find_ref_lock(
2613 struct v4l2_ctrl_handler *hdl, u32 id)
2614 {
2615 struct v4l2_ctrl_ref *ref = NULL;
2616
2617 if (hdl) {
2618 mutex_lock(hdl->lock);
2619 ref = find_ref(hdl, id);
2620 mutex_unlock(hdl->lock);
2621 }
2622 return ref;
2623 }
2624
2625 /* Find a control with the given ID. */
2626 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
2627 {
2628 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
2629
2630 return ref ? ref->ctrl : NULL;
2631 }
2632 EXPORT_SYMBOL(v4l2_ctrl_find);
2633
2634 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
2635 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
2636 struct v4l2_ctrl *ctrl,
2637 struct v4l2_ctrl_ref **ctrl_ref,
2638 bool from_other_dev, bool allocate_req)
2639 {
2640 struct v4l2_ctrl_ref *ref;
2641 struct v4l2_ctrl_ref *new_ref;
2642 u32 id = ctrl->id;
2643 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
2644 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
2645 unsigned int size_extra_req = 0;
2646
2647 if (ctrl_ref)
2648 *ctrl_ref = NULL;
2649
2650 /*
2651 * Automatically add the control class if it is not yet present and
2652 * the new control is not a compound control.
2653 */
2654 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
2655 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
2656 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
2657 return hdl->error;
2658
2659 if (hdl->error)
2660 return hdl->error;
2661
2662 if (allocate_req)
2663 size_extra_req = ctrl->elems * ctrl->elem_size;
2664 new_ref = kzalloc(sizeof(*new_ref) + size_extra_req, GFP_KERNEL);
2665 if (!new_ref)
2666 return handler_set_err(hdl, -ENOMEM);
2667 new_ref->ctrl = ctrl;
2668 new_ref->from_other_dev = from_other_dev;
2669 if (size_extra_req)
2670 new_ref->p_req.p = &new_ref[1];
2671
2672 INIT_LIST_HEAD(&new_ref->node);
2673
2674 mutex_lock(hdl->lock);
2675
2676 /* Add immediately at the end of the list if the list is empty, or if
2677 the last element in the list has a lower ID.
2678 This ensures that when elements are added in ascending order the
2679 insertion is an O(1) operation. */
2680 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
2681 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
2682 goto insert_in_hash;
2683 }
2684
2685 /* Find insert position in sorted list */
2686 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2687 if (ref->ctrl->id < id)
2688 continue;
2689 /* Don't add duplicates */
2690 if (ref->ctrl->id == id) {
2691 kfree(new_ref);
2692 goto unlock;
2693 }
2694 list_add(&new_ref->node, ref->node.prev);
2695 break;
2696 }
2697
2698 insert_in_hash:
2699 /* Insert the control node in the hash */
2700 new_ref->next = hdl->buckets[bucket];
2701 hdl->buckets[bucket] = new_ref;
2702 if (ctrl_ref)
2703 *ctrl_ref = new_ref;
2704 if (ctrl->handler == hdl) {
2705 /* By default each control starts in a cluster of its own.
2706 * new_ref->ctrl is basically a cluster array with one
2707 * element, so that's perfect to use as the cluster pointer.
2708 * But only do this for the handler that owns the control.
2709 */
2710 ctrl->cluster = &new_ref->ctrl;
2711 ctrl->ncontrols = 1;
2712 }
2713
2714 unlock:
2715 mutex_unlock(hdl->lock);
2716 return 0;
2717 }
2718
2719 /* Add a new control */
2720 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
2721 const struct v4l2_ctrl_ops *ops,
2722 const struct v4l2_ctrl_type_ops *type_ops,
2723 u32 id, const char *name, enum v4l2_ctrl_type type,
2724 s64 min, s64 max, u64 step, s64 def,
2725 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
2726 u32 flags, const char * const *qmenu,
2727 const s64 *qmenu_int, const union v4l2_ctrl_ptr p_def,
2728 void *priv)
2729 {
2730 struct v4l2_ctrl *ctrl;
2731 unsigned sz_extra;
2732 unsigned nr_of_dims = 0;
2733 unsigned elems = 1;
2734 bool is_array;
2735 unsigned tot_ctrl_size;
2736 unsigned idx;
2737 void *data;
2738 int err;
2739
2740 if (hdl->error)
2741 return NULL;
2742
2743 while (dims && dims[nr_of_dims]) {
2744 elems *= dims[nr_of_dims];
2745 nr_of_dims++;
2746 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
2747 break;
2748 }
2749 is_array = nr_of_dims > 0;
2750
2751 /* Prefill elem_size for all types handled by std_type_ops */
2752 switch ((u32)type) {
2753 case V4L2_CTRL_TYPE_INTEGER64:
2754 elem_size = sizeof(s64);
2755 break;
2756 case V4L2_CTRL_TYPE_STRING:
2757 elem_size = max + 1;
2758 break;
2759 case V4L2_CTRL_TYPE_U8:
2760 elem_size = sizeof(u8);
2761 break;
2762 case V4L2_CTRL_TYPE_U16:
2763 elem_size = sizeof(u16);
2764 break;
2765 case V4L2_CTRL_TYPE_U32:
2766 elem_size = sizeof(u32);
2767 break;
2768 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
2769 elem_size = sizeof(struct v4l2_ctrl_mpeg2_slice_params);
2770 break;
2771 case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
2772 elem_size = sizeof(struct v4l2_ctrl_mpeg2_quantization);
2773 break;
2774 case V4L2_CTRL_TYPE_FWHT_PARAMS:
2775 elem_size = sizeof(struct v4l2_ctrl_fwht_params);
2776 break;
2777 case V4L2_CTRL_TYPE_H264_SPS:
2778 elem_size = sizeof(struct v4l2_ctrl_h264_sps);
2779 break;
2780 case V4L2_CTRL_TYPE_H264_PPS:
2781 elem_size = sizeof(struct v4l2_ctrl_h264_pps);
2782 break;
2783 case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
2784 elem_size = sizeof(struct v4l2_ctrl_h264_scaling_matrix);
2785 break;
2786 case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
2787 elem_size = sizeof(struct v4l2_ctrl_h264_slice_params);
2788 break;
2789 case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
2790 elem_size = sizeof(struct v4l2_ctrl_h264_decode_params);
2791 break;
2792 case V4L2_CTRL_TYPE_H264_PRED_WEIGHTS:
2793 elem_size = sizeof(struct v4l2_ctrl_h264_pred_weights);
2794 break;
2795 case V4L2_CTRL_TYPE_VP8_FRAME_HEADER:
2796 elem_size = sizeof(struct v4l2_ctrl_vp8_frame_header);
2797 break;
2798 case V4L2_CTRL_TYPE_HEVC_SPS:
2799 elem_size = sizeof(struct v4l2_ctrl_hevc_sps);
2800 break;
2801 case V4L2_CTRL_TYPE_HEVC_PPS:
2802 elem_size = sizeof(struct v4l2_ctrl_hevc_pps);
2803 break;
2804 case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
2805 elem_size = sizeof(struct v4l2_ctrl_hevc_slice_params);
2806 break;
2807 case V4L2_CTRL_TYPE_AREA:
2808 elem_size = sizeof(struct v4l2_area);
2809 break;
2810 default:
2811 if (type < V4L2_CTRL_COMPOUND_TYPES)
2812 elem_size = sizeof(s32);
2813 break;
2814 }
2815 tot_ctrl_size = elem_size * elems;
2816
2817 /* Sanity checks */
2818 if (id == 0 || name == NULL || !elem_size ||
2819 id >= V4L2_CID_PRIVATE_BASE ||
2820 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2821 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2822 handler_set_err(hdl, -ERANGE);
2823 return NULL;
2824 }
2825 err = check_range(type, min, max, step, def);
2826 if (err) {
2827 handler_set_err(hdl, err);
2828 return NULL;
2829 }
2830 if (is_array &&
2831 (type == V4L2_CTRL_TYPE_BUTTON ||
2832 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2833 handler_set_err(hdl, -EINVAL);
2834 return NULL;
2835 }
2836
2837 sz_extra = 0;
2838 if (type == V4L2_CTRL_TYPE_BUTTON)
2839 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2840 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2841 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2842 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2843 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2844 type == V4L2_CTRL_TYPE_STRING ||
2845 type >= V4L2_CTRL_COMPOUND_TYPES ||
2846 is_array)
2847 sz_extra += 2 * tot_ctrl_size;
2848
2849 if (type >= V4L2_CTRL_COMPOUND_TYPES && p_def.p_const)
2850 sz_extra += elem_size;
2851
2852 ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2853 if (ctrl == NULL) {
2854 handler_set_err(hdl, -ENOMEM);
2855 return NULL;
2856 }
2857
2858 INIT_LIST_HEAD(&ctrl->node);
2859 INIT_LIST_HEAD(&ctrl->ev_subs);
2860 ctrl->handler = hdl;
2861 ctrl->ops = ops;
2862 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2863 ctrl->id = id;
2864 ctrl->name = name;
2865 ctrl->type = type;
2866 ctrl->flags = flags;
2867 ctrl->minimum = min;
2868 ctrl->maximum = max;
2869 ctrl->step = step;
2870 ctrl->default_value = def;
2871 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2872 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2873 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2874 ctrl->is_array = is_array;
2875 ctrl->elems = elems;
2876 ctrl->nr_of_dims = nr_of_dims;
2877 if (nr_of_dims)
2878 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2879 ctrl->elem_size = elem_size;
2880 if (type == V4L2_CTRL_TYPE_MENU)
2881 ctrl->qmenu = qmenu;
2882 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2883 ctrl->qmenu_int = qmenu_int;
2884 ctrl->priv = priv;
2885 ctrl->cur.val = ctrl->val = def;
2886 data = &ctrl[1];
2887
2888 if (!ctrl->is_int) {
2889 ctrl->p_new.p = data;
2890 ctrl->p_cur.p = data + tot_ctrl_size;
2891 } else {
2892 ctrl->p_new.p = &ctrl->val;
2893 ctrl->p_cur.p = &ctrl->cur.val;
2894 }
2895
2896 if (type >= V4L2_CTRL_COMPOUND_TYPES && p_def.p_const) {
2897 ctrl->p_def.p = ctrl->p_cur.p + tot_ctrl_size;
2898 memcpy(ctrl->p_def.p, p_def.p_const, elem_size);
2899 }
2900
2901 for (idx = 0; idx < elems; idx++) {
2902 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2903 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2904 }
2905
2906 if (handler_new_ref(hdl, ctrl, NULL, false, false)) {
2907 kvfree(ctrl);
2908 return NULL;
2909 }
2910 mutex_lock(hdl->lock);
2911 list_add_tail(&ctrl->node, &hdl->ctrls);
2912 mutex_unlock(hdl->lock);
2913 return ctrl;
2914 }
2915
2916 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2917 const struct v4l2_ctrl_config *cfg, void *priv)
2918 {
2919 bool is_menu;
2920 struct v4l2_ctrl *ctrl;
2921 const char *name = cfg->name;
2922 const char * const *qmenu = cfg->qmenu;
2923 const s64 *qmenu_int = cfg->qmenu_int;
2924 enum v4l2_ctrl_type type = cfg->type;
2925 u32 flags = cfg->flags;
2926 s64 min = cfg->min;
2927 s64 max = cfg->max;
2928 u64 step = cfg->step;
2929 s64 def = cfg->def;
2930
2931 if (name == NULL)
2932 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2933 &def, &flags);
2934
2935 is_menu = (type == V4L2_CTRL_TYPE_MENU ||
2936 type == V4L2_CTRL_TYPE_INTEGER_MENU);
2937 if (is_menu)
2938 WARN_ON(step);
2939 else
2940 WARN_ON(cfg->menu_skip_mask);
2941 if (type == V4L2_CTRL_TYPE_MENU && !qmenu) {
2942 qmenu = v4l2_ctrl_get_menu(cfg->id);
2943 } else if (type == V4L2_CTRL_TYPE_INTEGER_MENU && !qmenu_int) {
2944 handler_set_err(hdl, -EINVAL);
2945 return NULL;
2946 }
2947
2948 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2949 type, min, max,
2950 is_menu ? cfg->menu_skip_mask : step, def,
2951 cfg->dims, cfg->elem_size,
2952 flags, qmenu, qmenu_int, cfg->p_def, priv);
2953 if (ctrl)
2954 ctrl->is_private = cfg->is_private;
2955 return ctrl;
2956 }
2957 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2958
2959 /* Helper function for standard non-menu controls */
2960 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2961 const struct v4l2_ctrl_ops *ops,
2962 u32 id, s64 min, s64 max, u64 step, s64 def)
2963 {
2964 const char *name;
2965 enum v4l2_ctrl_type type;
2966 u32 flags;
2967
2968 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2969 if (type == V4L2_CTRL_TYPE_MENU ||
2970 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2971 type >= V4L2_CTRL_COMPOUND_TYPES) {
2972 handler_set_err(hdl, -EINVAL);
2973 return NULL;
2974 }
2975 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2976 min, max, step, def, NULL, 0,
2977 flags, NULL, NULL, ptr_null, NULL);
2978 }
2979 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2980
2981 /* Helper function for standard menu controls */
2982 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2983 const struct v4l2_ctrl_ops *ops,
2984 u32 id, u8 _max, u64 mask, u8 _def)
2985 {
2986 const char * const *qmenu = NULL;
2987 const s64 *qmenu_int = NULL;
2988 unsigned int qmenu_int_len = 0;
2989 const char *name;
2990 enum v4l2_ctrl_type type;
2991 s64 min;
2992 s64 max = _max;
2993 s64 def = _def;
2994 u64 step;
2995 u32 flags;
2996
2997 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2998
2999 if (type == V4L2_CTRL_TYPE_MENU)
3000 qmenu = v4l2_ctrl_get_menu(id);
3001 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
3002 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
3003
3004 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
3005 handler_set_err(hdl, -EINVAL);
3006 return NULL;
3007 }
3008 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
3009 0, max, mask, def, NULL, 0,
3010 flags, qmenu, qmenu_int, ptr_null, NULL);
3011 }
3012 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
3013
3014 /* Helper function for standard menu controls with driver defined menu */
3015 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
3016 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
3017 u64 mask, u8 _def, const char * const *qmenu)
3018 {
3019 enum v4l2_ctrl_type type;
3020 const char *name;
3021 u32 flags;
3022 u64 step;
3023 s64 min;
3024 s64 max = _max;
3025 s64 def = _def;
3026
3027 /* v4l2_ctrl_new_std_menu_items() should only be called for
3028 * standard controls without a standard menu.
3029 */
3030 if (v4l2_ctrl_get_menu(id)) {
3031 handler_set_err(hdl, -EINVAL);
3032 return NULL;
3033 }
3034
3035 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
3036 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
3037 handler_set_err(hdl, -EINVAL);
3038 return NULL;
3039 }
3040 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
3041 0, max, mask, def, NULL, 0,
3042 flags, qmenu, NULL, ptr_null, NULL);
3043
3044 }
3045 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
3046
3047 /* Helper function for standard compound controls */
3048 struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl,
3049 const struct v4l2_ctrl_ops *ops, u32 id,
3050 const union v4l2_ctrl_ptr p_def)
3051 {
3052 const char *name;
3053 enum v4l2_ctrl_type type;
3054 u32 flags;
3055 s64 min, max, step, def;
3056
3057 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
3058 if (type < V4L2_CTRL_COMPOUND_TYPES) {
3059 handler_set_err(hdl, -EINVAL);
3060 return NULL;
3061 }
3062 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
3063 min, max, step, def, NULL, 0,
3064 flags, NULL, NULL, p_def, NULL);
3065 }
3066 EXPORT_SYMBOL(v4l2_ctrl_new_std_compound);
3067
3068 /* Helper function for standard integer menu controls */
3069 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
3070 const struct v4l2_ctrl_ops *ops,
3071 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
3072 {
3073 const char *name;
3074 enum v4l2_ctrl_type type;
3075 s64 min;
3076 u64 step;
3077 s64 max = _max;
3078 s64 def = _def;
3079 u32 flags;
3080
3081 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
3082 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
3083 handler_set_err(hdl, -EINVAL);
3084 return NULL;
3085 }
3086 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
3087 0, max, 0, def, NULL, 0,
3088 flags, NULL, qmenu_int, ptr_null, NULL);
3089 }
3090 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
3091
3092 /* Add the controls from another handler to our own. */
3093 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
3094 struct v4l2_ctrl_handler *add,
3095 bool (*filter)(const struct v4l2_ctrl *ctrl),
3096 bool from_other_dev)
3097 {
3098 struct v4l2_ctrl_ref *ref;
3099 int ret = 0;
3100
3101 /* Do nothing if either handler is NULL or if they are the same */
3102 if (!hdl || !add || hdl == add)
3103 return 0;
3104 if (hdl->error)
3105 return hdl->error;
3106 mutex_lock(add->lock);
3107 list_for_each_entry(ref, &add->ctrl_refs, node) {
3108 struct v4l2_ctrl *ctrl = ref->ctrl;
3109
3110 /* Skip handler-private controls. */
3111 if (ctrl->is_private)
3112 continue;
3113 /* And control classes */
3114 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
3115 continue;
3116 /* Filter any unwanted controls */
3117 if (filter && !filter(ctrl))
3118 continue;
3119 ret = handler_new_ref(hdl, ctrl, NULL, from_other_dev, false);
3120 if (ret)
3121 break;
3122 }
3123 mutex_unlock(add->lock);
3124 return ret;
3125 }
3126 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
3127
3128 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
3129 {
3130 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
3131 return true;
3132 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
3133 return true;
3134 switch (ctrl->id) {
3135 case V4L2_CID_AUDIO_MUTE:
3136 case V4L2_CID_AUDIO_VOLUME:
3137 case V4L2_CID_AUDIO_BALANCE:
3138 case V4L2_CID_AUDIO_BASS:
3139 case V4L2_CID_AUDIO_TREBLE:
3140 case V4L2_CID_AUDIO_LOUDNESS:
3141 return true;
3142 default:
3143 break;
3144 }
3145 return false;
3146 }
3147 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
3148
3149 /* Cluster controls */
3150 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
3151 {
3152 bool has_volatiles = false;
3153 int i;
3154
3155 /* The first control is the master control and it must not be NULL */
3156 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
3157 return;
3158
3159 for (i = 0; i < ncontrols; i++) {
3160 if (controls[i]) {
3161 controls[i]->cluster = controls;
3162 controls[i]->ncontrols = ncontrols;
3163 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
3164 has_volatiles = true;
3165 }
3166 }
3167 controls[0]->has_volatiles = has_volatiles;
3168 }
3169 EXPORT_SYMBOL(v4l2_ctrl_cluster);
3170
3171 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
3172 u8 manual_val, bool set_volatile)
3173 {
3174 struct v4l2_ctrl *master = controls[0];
3175 u32 flag = 0;
3176 int i;
3177
3178 v4l2_ctrl_cluster(ncontrols, controls);
3179 WARN_ON(ncontrols <= 1);
3180 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
3181 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
3182 master->is_auto = true;
3183 master->has_volatiles = set_volatile;
3184 master->manual_mode_value = manual_val;
3185 master->flags |= V4L2_CTRL_FLAG_UPDATE;
3186
3187 if (!is_cur_manual(master))
3188 flag = V4L2_CTRL_FLAG_INACTIVE |
3189 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
3190
3191 for (i = 1; i < ncontrols; i++)
3192 if (controls[i])
3193 controls[i]->flags |= flag;
3194 }
3195 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
3196
3197 /* Activate/deactivate a control. */
3198 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
3199 {
3200 /* invert since the actual flag is called 'inactive' */
3201 bool inactive = !active;
3202 bool old;
3203
3204 if (ctrl == NULL)
3205 return;
3206
3207 if (inactive)
3208 /* set V4L2_CTRL_FLAG_INACTIVE */
3209 old = test_and_set_bit(4, &ctrl->flags);
3210 else
3211 /* clear V4L2_CTRL_FLAG_INACTIVE */
3212 old = test_and_clear_bit(4, &ctrl->flags);
3213 if (old != inactive)
3214 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
3215 }
3216 EXPORT_SYMBOL(v4l2_ctrl_activate);
3217
3218 void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
3219 {
3220 bool old;
3221
3222 if (ctrl == NULL)
3223 return;
3224
3225 lockdep_assert_held(ctrl->handler->lock);
3226
3227 if (grabbed)
3228 /* set V4L2_CTRL_FLAG_GRABBED */
3229 old = test_and_set_bit(1, &ctrl->flags);
3230 else
3231 /* clear V4L2_CTRL_FLAG_GRABBED */
3232 old = test_and_clear_bit(1, &ctrl->flags);
3233 if (old != grabbed)
3234 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
3235 }
3236 EXPORT_SYMBOL(__v4l2_ctrl_grab);
3237
3238 /* Log the control name and value */
3239 static void log_ctrl(const struct v4l2_ctrl *ctrl,
3240 const char *prefix, const char *colon)
3241 {
3242 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
3243 return;
3244 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
3245 return;
3246
3247 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
3248
3249 ctrl->type_ops->log(ctrl);
3250
3251 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
3252 V4L2_CTRL_FLAG_GRABBED |
3253 V4L2_CTRL_FLAG_VOLATILE)) {
3254 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
3255 pr_cont(" inactive");
3256 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
3257 pr_cont(" grabbed");
3258 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
3259 pr_cont(" volatile");
3260 }
3261 pr_cont("\n");
3262 }
3263
3264 /* Log all controls owned by the handler */
3265 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
3266 const char *prefix)
3267 {
3268 struct v4l2_ctrl *ctrl;
3269 const char *colon = "";
3270 int len;
3271
3272 if (hdl == NULL)
3273 return;
3274 if (prefix == NULL)
3275 prefix = "";
3276 len = strlen(prefix);
3277 if (len && prefix[len - 1] != ' ')
3278 colon = ": ";
3279 mutex_lock(hdl->lock);
3280 list_for_each_entry(ctrl, &hdl->ctrls, node)
3281 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
3282 log_ctrl(ctrl, prefix, colon);
3283 mutex_unlock(hdl->lock);
3284 }
3285 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
3286
3287 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
3288 {
3289 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
3290 return 0;
3291 }
3292 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
3293
3294 /* Call s_ctrl for all controls owned by the handler */
3295 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
3296 {
3297 struct v4l2_ctrl *ctrl;
3298 int ret = 0;
3299
3300 if (hdl == NULL)
3301 return 0;
3302
3303 lockdep_assert_held(hdl->lock);
3304
3305 list_for_each_entry(ctrl, &hdl->ctrls, node)
3306 ctrl->done = false;
3307
3308 list_for_each_entry(ctrl, &hdl->ctrls, node) {
3309 struct v4l2_ctrl *master = ctrl->cluster[0];
3310 int i;
3311
3312 /* Skip if this control was already handled by a cluster. */
3313 /* Skip button controls and read-only controls. */
3314 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
3315 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
3316 continue;
3317
3318 for (i = 0; i < master->ncontrols; i++) {
3319 if (master->cluster[i]) {
3320 cur_to_new(master->cluster[i]);
3321 master->cluster[i]->is_new = 1;
3322 master->cluster[i]->done = true;
3323 }
3324 }
3325 ret = call_op(master, s_ctrl);
3326 if (ret)
3327 break;
3328 }
3329
3330 return ret;
3331 }
3332 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
3333
3334 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
3335 {
3336 int ret;
3337
3338 if (hdl == NULL)
3339 return 0;
3340
3341 mutex_lock(hdl->lock);
3342 ret = __v4l2_ctrl_handler_setup(hdl);
3343 mutex_unlock(hdl->lock);
3344
3345 return ret;
3346 }
3347 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
3348
3349 /* Implement VIDIOC_QUERY_EXT_CTRL */
3350 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
3351 {
3352 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
3353 u32 id = qc->id & V4L2_CTRL_ID_MASK;
3354 struct v4l2_ctrl_ref *ref;
3355 struct v4l2_ctrl *ctrl;
3356
3357 if (hdl == NULL)
3358 return -EINVAL;
3359
3360 mutex_lock(hdl->lock);
3361
3362 /* Try to find it */
3363 ref = find_ref(hdl, id);
3364
3365 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
3366 bool is_compound;
3367 /* Match any control that is not hidden */
3368 unsigned mask = 1;
3369 bool match = false;
3370
3371 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
3372 /* Match any hidden control */
3373 match = true;
3374 } else if ((qc->id & next_flags) == next_flags) {
3375 /* Match any control, compound or not */
3376 mask = 0;
3377 }
3378
3379 /* Find the next control with ID > qc->id */
3380
3381 /* Did we reach the end of the control list? */
3382 if (id >= node2id(hdl->ctrl_refs.prev)) {
3383 ref = NULL; /* Yes, so there is no next control */
3384 } else if (ref) {
3385 /* We found a control with the given ID, so just get
3386 the next valid one in the list. */
3387 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
3388 is_compound = ref->ctrl->is_array ||
3389 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
3390 if (id < ref->ctrl->id &&
3391 (is_compound & mask) == match)
3392 break;
3393 }
3394 if (&ref->node == &hdl->ctrl_refs)
3395 ref = NULL;
3396 } else {
3397 /* No control with the given ID exists, so start
3398 searching for the next largest ID. We know there
3399 is one, otherwise the first 'if' above would have
3400 been true. */
3401 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
3402 is_compound = ref->ctrl->is_array ||
3403 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
3404 if (id < ref->ctrl->id &&
3405 (is_compound & mask) == match)
3406 break;
3407 }
3408 if (&ref->node == &hdl->ctrl_refs)
3409 ref = NULL;
3410 }
3411 }
3412 mutex_unlock(hdl->lock);
3413
3414 if (!ref)
3415 return -EINVAL;
3416
3417 ctrl = ref->ctrl;
3418 memset(qc, 0, sizeof(*qc));
3419 if (id >= V4L2_CID_PRIVATE_BASE)
3420 qc->id = id;
3421 else
3422 qc->id = ctrl->id;
3423 strscpy(qc->name, ctrl->name, sizeof(qc->name));
3424 qc->flags = user_flags(ctrl);
3425 qc->type = ctrl->type;
3426 qc->elem_size = ctrl->elem_size;
3427 qc->elems = ctrl->elems;
3428 qc->nr_of_dims = ctrl->nr_of_dims;
3429 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
3430 qc->minimum = ctrl->minimum;
3431 qc->maximum = ctrl->maximum;
3432 qc->default_value = ctrl->default_value;
3433 if (ctrl->type == V4L2_CTRL_TYPE_MENU
3434 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
3435 qc->step = 1;
3436 else
3437 qc->step = ctrl->step;
3438 return 0;
3439 }
3440 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
3441
3442 /* Implement VIDIOC_QUERYCTRL */
3443 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
3444 {
3445 struct v4l2_query_ext_ctrl qec = { qc->id };
3446 int rc;
3447
3448 rc = v4l2_query_ext_ctrl(hdl, &qec);
3449 if (rc)
3450 return rc;
3451
3452 qc->id = qec.id;
3453 qc->type = qec.type;
3454 qc->flags = qec.flags;
3455 strscpy(qc->name, qec.name, sizeof(qc->name));
3456 switch (qc->type) {
3457 case V4L2_CTRL_TYPE_INTEGER:
3458 case V4L2_CTRL_TYPE_BOOLEAN:
3459 case V4L2_CTRL_TYPE_MENU:
3460 case V4L2_CTRL_TYPE_INTEGER_MENU:
3461 case V4L2_CTRL_TYPE_STRING:
3462 case V4L2_CTRL_TYPE_BITMASK:
3463 qc->minimum = qec.minimum;
3464 qc->maximum = qec.maximum;
3465 qc->step = qec.step;
3466 qc->default_value = qec.default_value;
3467 break;
3468 default:
3469 qc->minimum = 0;
3470 qc->maximum = 0;
3471 qc->step = 0;
3472 qc->default_value = 0;
3473 break;
3474 }
3475 return 0;
3476 }
3477 EXPORT_SYMBOL(v4l2_queryctrl);
3478
3479 /* Implement VIDIOC_QUERYMENU */
3480 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
3481 {
3482 struct v4l2_ctrl *ctrl;
3483 u32 i = qm->index;
3484
3485 ctrl = v4l2_ctrl_find(hdl, qm->id);
3486 if (!ctrl)
3487 return -EINVAL;
3488
3489 qm->reserved = 0;
3490 /* Sanity checks */
3491 switch (ctrl->type) {
3492 case V4L2_CTRL_TYPE_MENU:
3493 if (ctrl->qmenu == NULL)
3494 return -EINVAL;
3495 break;
3496 case V4L2_CTRL_TYPE_INTEGER_MENU:
3497 if (ctrl->qmenu_int == NULL)
3498 return -EINVAL;
3499 break;
3500 default:
3501 return -EINVAL;
3502 }
3503
3504 if (i < ctrl->minimum || i > ctrl->maximum)
3505 return -EINVAL;
3506
3507 /* Use mask to see if this menu item should be skipped */
3508 if (ctrl->menu_skip_mask & (1ULL << i))
3509 return -EINVAL;
3510 /* Empty menu items should also be skipped */
3511 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
3512 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
3513 return -EINVAL;
3514 strscpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
3515 } else {
3516 qm->value = ctrl->qmenu_int[i];
3517 }
3518 return 0;
3519 }
3520 EXPORT_SYMBOL(v4l2_querymenu);
3521
3522 static int v4l2_ctrl_request_clone(struct v4l2_ctrl_handler *hdl,
3523 const struct v4l2_ctrl_handler *from)
3524 {
3525 struct v4l2_ctrl_ref *ref;
3526 int err = 0;
3527
3528 if (WARN_ON(!hdl || hdl == from))
3529 return -EINVAL;
3530
3531 if (hdl->error)
3532 return hdl->error;
3533
3534 WARN_ON(hdl->lock != &hdl->_lock);
3535
3536 mutex_lock(from->lock);
3537 list_for_each_entry(ref, &from->ctrl_refs, node) {
3538 struct v4l2_ctrl *ctrl = ref->ctrl;
3539 struct v4l2_ctrl_ref *new_ref;
3540
3541 /* Skip refs inherited from other devices */
3542 if (ref->from_other_dev)
3543 continue;
3544 err = handler_new_ref(hdl, ctrl, &new_ref, false, true);
3545 if (err)
3546 break;
3547 }
3548 mutex_unlock(from->lock);
3549 return err;
3550 }
3551
3552 static void v4l2_ctrl_request_queue(struct media_request_object *obj)
3553 {
3554 struct v4l2_ctrl_handler *hdl =
3555 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3556 struct v4l2_ctrl_handler *main_hdl = obj->priv;
3557 struct v4l2_ctrl_handler *prev_hdl = NULL;
3558 struct v4l2_ctrl_ref *ref_ctrl, *ref_ctrl_prev = NULL;
3559
3560 mutex_lock(main_hdl->lock);
3561 if (list_empty(&main_hdl->requests_queued))
3562 goto queue;
3563
3564 prev_hdl = list_last_entry(&main_hdl->requests_queued,
3565 struct v4l2_ctrl_handler, requests_queued);
3566 /*
3567 * Note: prev_hdl and hdl must contain the same list of control
3568 * references, so if any differences are detected then that is a
3569 * driver bug and the WARN_ON is triggered.
3570 */
3571 mutex_lock(prev_hdl->lock);
3572 ref_ctrl_prev = list_first_entry(&prev_hdl->ctrl_refs,
3573 struct v4l2_ctrl_ref, node);
3574 list_for_each_entry(ref_ctrl, &hdl->ctrl_refs, node) {
3575 if (ref_ctrl->req)
3576 continue;
3577 while (ref_ctrl_prev->ctrl->id < ref_ctrl->ctrl->id) {
3578 /* Should never happen, but just in case... */
3579 if (list_is_last(&ref_ctrl_prev->node,
3580 &prev_hdl->ctrl_refs))
3581 break;
3582 ref_ctrl_prev = list_next_entry(ref_ctrl_prev, node);
3583 }
3584 if (WARN_ON(ref_ctrl_prev->ctrl->id != ref_ctrl->ctrl->id))
3585 break;
3586 ref_ctrl->req = ref_ctrl_prev->req;
3587 }
3588 mutex_unlock(prev_hdl->lock);
3589 queue:
3590 list_add_tail(&hdl->requests_queued, &main_hdl->requests_queued);
3591 hdl->request_is_queued = true;
3592 mutex_unlock(main_hdl->lock);
3593 }
3594
3595 static void v4l2_ctrl_request_unbind(struct media_request_object *obj)
3596 {
3597 struct v4l2_ctrl_handler *hdl =
3598 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3599 struct v4l2_ctrl_handler *main_hdl = obj->priv;
3600
3601 list_del_init(&hdl->requests);
3602 mutex_lock(main_hdl->lock);
3603 if (hdl->request_is_queued) {
3604 list_del_init(&hdl->requests_queued);
3605 hdl->request_is_queued = false;
3606 }
3607 mutex_unlock(main_hdl->lock);
3608 }
3609
3610 static void v4l2_ctrl_request_release(struct media_request_object *obj)
3611 {
3612 struct v4l2_ctrl_handler *hdl =
3613 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3614
3615 v4l2_ctrl_handler_free(hdl);
3616 kfree(hdl);
3617 }
3618
3619 static const struct media_request_object_ops req_ops = {
3620 .queue = v4l2_ctrl_request_queue,
3621 .unbind = v4l2_ctrl_request_unbind,
3622 .release = v4l2_ctrl_request_release,
3623 };
3624
3625 struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
3626 struct v4l2_ctrl_handler *parent)
3627 {
3628 struct media_request_object *obj;
3629
3630 if (WARN_ON(req->state != MEDIA_REQUEST_STATE_VALIDATING &&
3631 req->state != MEDIA_REQUEST_STATE_QUEUED))
3632 return NULL;
3633
3634 obj = media_request_object_find(req, &req_ops, parent);
3635 if (obj)
3636 return container_of(obj, struct v4l2_ctrl_handler, req_obj);
3637 return NULL;
3638 }
3639 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_find);
3640
3641 struct v4l2_ctrl *
3642 v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
3643 {
3644 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
3645
3646 return (ref && ref->req == ref) ? ref->ctrl : NULL;
3647 }
3648 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_ctrl_find);
3649
3650 static int v4l2_ctrl_request_bind(struct media_request *req,
3651 struct v4l2_ctrl_handler *hdl,
3652 struct v4l2_ctrl_handler *from)
3653 {
3654 int ret;
3655
3656 ret = v4l2_ctrl_request_clone(hdl, from);
3657
3658 if (!ret) {
3659 ret = media_request_object_bind(req, &req_ops,
3660 from, false, &hdl->req_obj);
3661 if (!ret)
3662 list_add_tail(&hdl->requests, &from->requests);
3663 }
3664 return ret;
3665 }
3666
3667 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
3668
3669 It is not a fully atomic operation, just best-effort only. After all, if
3670 multiple controls have to be set through multiple i2c writes (for example)
3671 then some initial writes may succeed while others fail. Thus leaving the
3672 system in an inconsistent state. The question is how much effort you are
3673 willing to spend on trying to make something atomic that really isn't.
3674
3675 From the point of view of an application the main requirement is that
3676 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
3677 error should be returned without actually affecting any controls.
3678
3679 If all the values are correct, then it is acceptable to just give up
3680 in case of low-level errors.
3681
3682 It is important though that the application can tell when only a partial
3683 configuration was done. The way we do that is through the error_idx field
3684 of struct v4l2_ext_controls: if that is equal to the count field then no
3685 controls were affected. Otherwise all controls before that index were
3686 successful in performing their 'get' or 'set' operation, the control at
3687 the given index failed, and you don't know what happened with the controls
3688 after the failed one. Since if they were part of a control cluster they
3689 could have been successfully processed (if a cluster member was encountered
3690 at index < error_idx), they could have failed (if a cluster member was at
3691 error_idx), or they may not have been processed yet (if the first cluster
3692 member appeared after error_idx).
3693
3694 It is all fairly theoretical, though. In practice all you can do is to
3695 bail out. If error_idx == count, then it is an application bug. If
3696 error_idx < count then it is only an application bug if the error code was
3697 EBUSY. That usually means that something started streaming just when you
3698 tried to set the controls. In all other cases it is a driver/hardware
3699 problem and all you can do is to retry or bail out.
3700
3701 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
3702 never modifies controls the error_idx is just set to whatever control
3703 has an invalid value.
3704 */
3705
3706 /* Prepare for the extended g/s/try functions.
3707 Find the controls in the control array and do some basic checks. */
3708 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
3709 struct v4l2_ext_controls *cs,
3710 struct v4l2_ctrl_helper *helpers,
3711 struct video_device *vdev,
3712 bool get)
3713 {
3714 struct v4l2_ctrl_helper *h;
3715 bool have_clusters = false;
3716 u32 i;
3717
3718 for (i = 0, h = helpers; i < cs->count; i++, h++) {
3719 struct v4l2_ext_control *c = &cs->controls[i];
3720 struct v4l2_ctrl_ref *ref;
3721 struct v4l2_ctrl *ctrl;
3722 u32 id = c->id & V4L2_CTRL_ID_MASK;
3723
3724 cs->error_idx = i;
3725
3726 if (cs->which &&
3727 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
3728 cs->which != V4L2_CTRL_WHICH_REQUEST_VAL &&
3729 V4L2_CTRL_ID2WHICH(id) != cs->which) {
3730 dprintk(vdev,
3731 "invalid which 0x%x or control id 0x%x\n",
3732 cs->which, id);
3733 return -EINVAL;
3734 }
3735
3736 /* Old-style private controls are not allowed for
3737 extended controls */
3738 if (id >= V4L2_CID_PRIVATE_BASE) {
3739 dprintk(vdev,
3740 "old-style private controls not allowed\n");
3741 return -EINVAL;
3742 }
3743 ref = find_ref_lock(hdl, id);
3744 if (ref == NULL) {
3745 dprintk(vdev, "cannot find control id 0x%x\n", id);
3746 return -EINVAL;
3747 }
3748 h->ref = ref;
3749 ctrl = ref->ctrl;
3750 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED) {
3751 dprintk(vdev, "control id 0x%x is disabled\n", id);
3752 return -EINVAL;
3753 }
3754
3755 if (ctrl->cluster[0]->ncontrols > 1)
3756 have_clusters = true;
3757 if (ctrl->cluster[0] != ctrl)
3758 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
3759 if (ctrl->is_ptr && !ctrl->is_string) {
3760 unsigned tot_size = ctrl->elems * ctrl->elem_size;
3761
3762 if (c->size < tot_size) {
3763 /*
3764 * In the get case the application first
3765 * queries to obtain the size of the control.
3766 */
3767 if (get) {
3768 c->size = tot_size;
3769 return -ENOSPC;
3770 }
3771 dprintk(vdev,
3772 "pointer control id 0x%x size too small, %d bytes but %d bytes needed\n",
3773 id, c->size, tot_size);
3774 return -EFAULT;
3775 }
3776 c->size = tot_size;
3777 }
3778 /* Store the ref to the master control of the cluster */
3779 h->mref = ref;
3780 /* Initially set next to 0, meaning that there is no other
3781 control in this helper array belonging to the same
3782 cluster */
3783 h->next = 0;
3784 }
3785
3786 /* We are done if there were no controls that belong to a multi-
3787 control cluster. */
3788 if (!have_clusters)
3789 return 0;
3790
3791 /* The code below figures out in O(n) time which controls in the list
3792 belong to the same cluster. */
3793
3794 /* This has to be done with the handler lock taken. */
3795 mutex_lock(hdl->lock);
3796
3797 /* First zero the helper field in the master control references */
3798 for (i = 0; i < cs->count; i++)
3799 helpers[i].mref->helper = NULL;
3800 for (i = 0, h = helpers; i < cs->count; i++, h++) {
3801 struct v4l2_ctrl_ref *mref = h->mref;
3802
3803 /* If the mref->helper is set, then it points to an earlier
3804 helper that belongs to the same cluster. */
3805 if (mref->helper) {
3806 /* Set the next field of mref->helper to the current
3807 index: this means that that earlier helper now
3808 points to the next helper in the same cluster. */
3809 mref->helper->next = i;
3810 /* mref should be set only for the first helper in the
3811 cluster, clear the others. */
3812 h->mref = NULL;
3813 }
3814 /* Point the mref helper to the current helper struct. */
3815 mref->helper = h;
3816 }
3817 mutex_unlock(hdl->lock);
3818 return 0;
3819 }
3820
3821 /* Handles the corner case where cs->count == 0. It checks whether the
3822 specified control class exists. If that class ID is 0, then it checks
3823 whether there are any controls at all. */
3824 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
3825 {
3826 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL ||
3827 which == V4L2_CTRL_WHICH_REQUEST_VAL)
3828 return 0;
3829 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
3830 }
3831
3832 /* Get extended controls. Allocates the helpers array if needed. */
3833 static int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl,
3834 struct v4l2_ext_controls *cs,
3835 struct video_device *vdev)
3836 {
3837 struct v4l2_ctrl_helper helper[4];
3838 struct v4l2_ctrl_helper *helpers = helper;
3839 int ret;
3840 int i, j;
3841 bool def_value;
3842
3843 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
3844
3845 cs->error_idx = cs->count;
3846 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3847
3848 if (hdl == NULL)
3849 return -EINVAL;
3850
3851 if (cs->count == 0)
3852 return class_check(hdl, cs->which);
3853
3854 if (cs->count > ARRAY_SIZE(helper)) {
3855 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3856 GFP_KERNEL);
3857 if (helpers == NULL)
3858 return -ENOMEM;
3859 }
3860
3861 ret = prepare_ext_ctrls(hdl, cs, helpers, vdev, true);
3862 cs->error_idx = cs->count;
3863
3864 for (i = 0; !ret && i < cs->count; i++)
3865 if (helpers[i].ref->ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3866 ret = -EACCES;
3867
3868 for (i = 0; !ret && i < cs->count; i++) {
3869 int (*ctrl_to_user)(struct v4l2_ext_control *c,
3870 struct v4l2_ctrl *ctrl);
3871 struct v4l2_ctrl *master;
3872
3873 ctrl_to_user = def_value ? def_to_user : cur_to_user;
3874
3875 if (helpers[i].mref == NULL)
3876 continue;
3877
3878 master = helpers[i].mref->ctrl;
3879 cs->error_idx = i;
3880
3881 v4l2_ctrl_lock(master);
3882
3883 /* g_volatile_ctrl will update the new control values */
3884 if (!def_value &&
3885 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
3886 (master->has_volatiles && !is_cur_manual(master)))) {
3887 for (j = 0; j < master->ncontrols; j++)
3888 cur_to_new(master->cluster[j]);
3889 ret = call_op(master, g_volatile_ctrl);
3890 ctrl_to_user = new_to_user;
3891 }
3892 /* If OK, then copy the current (for non-volatile controls)
3893 or the new (for volatile controls) control values to the
3894 caller */
3895 if (!ret) {
3896 u32 idx = i;
3897
3898 do {
3899 if (helpers[idx].ref->req)
3900 ret = req_to_user(cs->controls + idx,
3901 helpers[idx].ref->req);
3902 else
3903 ret = ctrl_to_user(cs->controls + idx,
3904 helpers[idx].ref->ctrl);
3905 idx = helpers[idx].next;
3906 } while (!ret && idx);
3907 }
3908 v4l2_ctrl_unlock(master);
3909 }
3910
3911 if (cs->count > ARRAY_SIZE(helper))
3912 kvfree(helpers);
3913 return ret;
3914 }
3915
3916 static struct media_request_object *
3917 v4l2_ctrls_find_req_obj(struct v4l2_ctrl_handler *hdl,
3918 struct media_request *req, bool set)
3919 {
3920 struct media_request_object *obj;
3921 struct v4l2_ctrl_handler *new_hdl;
3922 int ret;
3923
3924 if (IS_ERR(req))
3925 return ERR_CAST(req);
3926
3927 if (set && WARN_ON(req->state != MEDIA_REQUEST_STATE_UPDATING))
3928 return ERR_PTR(-EBUSY);
3929
3930 obj = media_request_object_find(req, &req_ops, hdl);
3931 if (obj)
3932 return obj;
3933 if (!set)
3934 return ERR_PTR(-ENOENT);
3935
3936 new_hdl = kzalloc(sizeof(*new_hdl), GFP_KERNEL);
3937 if (!new_hdl)
3938 return ERR_PTR(-ENOMEM);
3939
3940 obj = &new_hdl->req_obj;
3941 ret = v4l2_ctrl_handler_init(new_hdl, (hdl->nr_of_buckets - 1) * 8);
3942 if (!ret)
3943 ret = v4l2_ctrl_request_bind(req, new_hdl, hdl);
3944 if (ret) {
3945 kfree(new_hdl);
3946
3947 return ERR_PTR(ret);
3948 }
3949
3950 media_request_object_get(obj);
3951 return obj;
3952 }
3953
3954 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct video_device *vdev,
3955 struct media_device *mdev, struct v4l2_ext_controls *cs)
3956 {
3957 struct media_request_object *obj = NULL;
3958 struct media_request *req = NULL;
3959 int ret;
3960
3961 if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3962 if (!mdev || cs->request_fd < 0)
3963 return -EINVAL;
3964
3965 req = media_request_get_by_fd(mdev, cs->request_fd);
3966 if (IS_ERR(req))
3967 return PTR_ERR(req);
3968
3969 if (req->state != MEDIA_REQUEST_STATE_COMPLETE) {
3970 media_request_put(req);
3971 return -EACCES;
3972 }
3973
3974 ret = media_request_lock_for_access(req);
3975 if (ret) {
3976 media_request_put(req);
3977 return ret;
3978 }
3979
3980 obj = v4l2_ctrls_find_req_obj(hdl, req, false);
3981 if (IS_ERR(obj)) {
3982 media_request_unlock_for_access(req);
3983 media_request_put(req);
3984 return PTR_ERR(obj);
3985 }
3986
3987 hdl = container_of(obj, struct v4l2_ctrl_handler,
3988 req_obj);
3989 }
3990
3991 ret = v4l2_g_ext_ctrls_common(hdl, cs, vdev);
3992
3993 if (obj) {
3994 media_request_unlock_for_access(req);
3995 media_request_object_put(obj);
3996 media_request_put(req);
3997 }
3998 return ret;
3999 }
4000 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
4001
4002 /* Helper function to get a single control */
4003 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
4004 {
4005 struct v4l2_ctrl *master = ctrl->cluster[0];
4006 int ret = 0;
4007 int i;
4008
4009 /* Compound controls are not supported. The new_to_user() and
4010 * cur_to_user() calls below would need to be modified not to access
4011 * userspace memory when called from get_ctrl().
4012 */
4013 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
4014 return -EINVAL;
4015
4016 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
4017 return -EACCES;
4018
4019 v4l2_ctrl_lock(master);
4020 /* g_volatile_ctrl will update the current control values */
4021 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
4022 for (i = 0; i < master->ncontrols; i++)
4023 cur_to_new(master->cluster[i]);
4024 ret = call_op(master, g_volatile_ctrl);
4025 new_to_user(c, ctrl);
4026 } else {
4027 cur_to_user(c, ctrl);
4028 }
4029 v4l2_ctrl_unlock(master);
4030 return ret;
4031 }
4032
4033 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
4034 {
4035 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
4036 struct v4l2_ext_control c;
4037 int ret;
4038
4039 if (ctrl == NULL || !ctrl->is_int)
4040 return -EINVAL;
4041 ret = get_ctrl(ctrl, &c);
4042 control->value = c.value;
4043 return ret;
4044 }
4045 EXPORT_SYMBOL(v4l2_g_ctrl);
4046
4047 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
4048 {
4049 struct v4l2_ext_control c;
4050
4051 /* It's a driver bug if this happens. */
4052 if (WARN_ON(!ctrl->is_int))
4053 return 0;
4054 c.value = 0;
4055 get_ctrl(ctrl, &c);
4056 return c.value;
4057 }
4058 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
4059
4060 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
4061 {
4062 struct v4l2_ext_control c;
4063
4064 /* It's a driver bug if this happens. */
4065 if (WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64))
4066 return 0;
4067 c.value64 = 0;
4068 get_ctrl(ctrl, &c);
4069 return c.value64;
4070 }
4071 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
4072
4073
4074 /* Core function that calls try/s_ctrl and ensures that the new value is
4075 copied to the current value on a set.
4076 Must be called with ctrl->handler->lock held. */
4077 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
4078 bool set, u32 ch_flags)
4079 {
4080 bool update_flag;
4081 int ret;
4082 int i;
4083
4084 /* Go through the cluster and either validate the new value or
4085 (if no new value was set), copy the current value to the new
4086 value, ensuring a consistent view for the control ops when
4087 called. */
4088 for (i = 0; i < master->ncontrols; i++) {
4089 struct v4l2_ctrl *ctrl = master->cluster[i];
4090
4091 if (ctrl == NULL)
4092 continue;
4093
4094 if (!ctrl->is_new) {
4095 cur_to_new(ctrl);
4096 continue;
4097 }
4098 /* Check again: it may have changed since the
4099 previous check in try_or_set_ext_ctrls(). */
4100 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
4101 return -EBUSY;
4102 }
4103
4104 ret = call_op(master, try_ctrl);
4105
4106 /* Don't set if there is no change */
4107 if (ret || !set || !cluster_changed(master))
4108 return ret;
4109 ret = call_op(master, s_ctrl);
4110 if (ret)
4111 return ret;
4112
4113 /* If OK, then make the new values permanent. */
4114 update_flag = is_cur_manual(master) != is_new_manual(master);
4115
4116 for (i = 0; i < master->ncontrols; i++) {
4117 /*
4118 * If we switch from auto to manual mode, and this cluster
4119 * contains volatile controls, then all non-master controls
4120 * have to be marked as changed. The 'new' value contains
4121 * the volatile value (obtained by update_from_auto_cluster),
4122 * which now has to become the current value.
4123 */
4124 if (i && update_flag && is_new_manual(master) &&
4125 master->has_volatiles && master->cluster[i])
4126 master->cluster[i]->has_changed = true;
4127
4128 new_to_cur(fh, master->cluster[i], ch_flags |
4129 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
4130 }
4131 return 0;
4132 }
4133
4134 /* Validate controls. */
4135 static int validate_ctrls(struct v4l2_ext_controls *cs,
4136 struct v4l2_ctrl_helper *helpers,
4137 struct video_device *vdev,
4138 bool set)
4139 {
4140 unsigned i;
4141 int ret = 0;
4142
4143 cs->error_idx = cs->count;
4144 for (i = 0; i < cs->count; i++) {
4145 struct v4l2_ctrl *ctrl = helpers[i].ref->ctrl;
4146 union v4l2_ctrl_ptr p_new;
4147
4148 cs->error_idx = i;
4149
4150 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY) {
4151 dprintk(vdev,
4152 "control id 0x%x is read-only\n",
4153 ctrl->id);
4154 return -EACCES;
4155 }
4156 /* This test is also done in try_set_control_cluster() which
4157 is called in atomic context, so that has the final say,
4158 but it makes sense to do an up-front check as well. Once
4159 an error occurs in try_set_control_cluster() some other
4160 controls may have been set already and we want to do a
4161 best-effort to avoid that. */
4162 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)) {
4163 dprintk(vdev,
4164 "control id 0x%x is grabbed, cannot set\n",
4165 ctrl->id);
4166 return -EBUSY;
4167 }
4168 /*
4169 * Skip validation for now if the payload needs to be copied
4170 * from userspace into kernelspace. We'll validate those later.
4171 */
4172 if (ctrl->is_ptr)
4173 continue;
4174 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4175 p_new.p_s64 = &cs->controls[i].value64;
4176 else
4177 p_new.p_s32 = &cs->controls[i].value;
4178 ret = validate_new(ctrl, p_new);
4179 if (ret)
4180 return ret;
4181 }
4182 return 0;
4183 }
4184
4185 /* Obtain the current volatile values of an autocluster and mark them
4186 as new. */
4187 static void update_from_auto_cluster(struct v4l2_ctrl *master)
4188 {
4189 int i;
4190
4191 for (i = 1; i < master->ncontrols; i++)
4192 cur_to_new(master->cluster[i]);
4193 if (!call_op(master, g_volatile_ctrl))
4194 for (i = 1; i < master->ncontrols; i++)
4195 if (master->cluster[i])
4196 master->cluster[i]->is_new = 1;
4197 }
4198
4199 /* Try or try-and-set controls */
4200 static int try_set_ext_ctrls_common(struct v4l2_fh *fh,
4201 struct v4l2_ctrl_handler *hdl,
4202 struct v4l2_ext_controls *cs,
4203 struct video_device *vdev, bool set)
4204 {
4205 struct v4l2_ctrl_helper helper[4];
4206 struct v4l2_ctrl_helper *helpers = helper;
4207 unsigned i, j;
4208 int ret;
4209
4210 cs->error_idx = cs->count;
4211
4212 /* Default value cannot be changed */
4213 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL) {
4214 dprintk(vdev, "%s: cannot change default value\n",
4215 video_device_node_name(vdev));
4216 return -EINVAL;
4217 }
4218
4219 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
4220
4221 if (hdl == NULL) {
4222 dprintk(vdev, "%s: invalid null control handler\n",
4223 video_device_node_name(vdev));
4224 return -EINVAL;
4225 }
4226
4227 if (cs->count == 0)
4228 return class_check(hdl, cs->which);
4229
4230 if (cs->count > ARRAY_SIZE(helper)) {
4231 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
4232 GFP_KERNEL);
4233 if (!helpers)
4234 return -ENOMEM;
4235 }
4236 ret = prepare_ext_ctrls(hdl, cs, helpers, vdev, false);
4237 if (!ret)
4238 ret = validate_ctrls(cs, helpers, vdev, set);
4239 if (ret && set)
4240 cs->error_idx = cs->count;
4241 for (i = 0; !ret && i < cs->count; i++) {
4242 struct v4l2_ctrl *master;
4243 u32 idx = i;
4244
4245 if (helpers[i].mref == NULL)
4246 continue;
4247
4248 cs->error_idx = i;
4249 master = helpers[i].mref->ctrl;
4250 v4l2_ctrl_lock(master);
4251
4252 /* Reset the 'is_new' flags of the cluster */
4253 for (j = 0; j < master->ncontrols; j++)
4254 if (master->cluster[j])
4255 master->cluster[j]->is_new = 0;
4256
4257 /* For volatile autoclusters that are currently in auto mode
4258 we need to discover if it will be set to manual mode.
4259 If so, then we have to copy the current volatile values
4260 first since those will become the new manual values (which
4261 may be overwritten by explicit new values from this set
4262 of controls). */
4263 if (master->is_auto && master->has_volatiles &&
4264 !is_cur_manual(master)) {
4265 /* Pick an initial non-manual value */
4266 s32 new_auto_val = master->manual_mode_value + 1;
4267 u32 tmp_idx = idx;
4268
4269 do {
4270 /* Check if the auto control is part of the
4271 list, and remember the new value. */
4272 if (helpers[tmp_idx].ref->ctrl == master)
4273 new_auto_val = cs->controls[tmp_idx].value;
4274 tmp_idx = helpers[tmp_idx].next;
4275 } while (tmp_idx);
4276 /* If the new value == the manual value, then copy
4277 the current volatile values. */
4278 if (new_auto_val == master->manual_mode_value)
4279 update_from_auto_cluster(master);
4280 }
4281
4282 /* Copy the new caller-supplied control values.
4283 user_to_new() sets 'is_new' to 1. */
4284 do {
4285 struct v4l2_ctrl *ctrl = helpers[idx].ref->ctrl;
4286
4287 ret = user_to_new(cs->controls + idx, ctrl);
4288 if (!ret && ctrl->is_ptr) {
4289 ret = validate_new(ctrl, ctrl->p_new);
4290 if (ret)
4291 dprintk(vdev,
4292 "failed to validate control %s (%d)\n",
4293 v4l2_ctrl_get_name(ctrl->id), ret);
4294 }
4295 idx = helpers[idx].next;
4296 } while (!ret && idx);
4297
4298 if (!ret)
4299 ret = try_or_set_cluster(fh, master,
4300 !hdl->req_obj.req && set, 0);
4301 if (!ret && hdl->req_obj.req && set) {
4302 for (j = 0; j < master->ncontrols; j++) {
4303 struct v4l2_ctrl_ref *ref =
4304 find_ref(hdl, master->cluster[j]->id);
4305
4306 new_to_req(ref);
4307 }
4308 }
4309
4310 /* Copy the new values back to userspace. */
4311 if (!ret) {
4312 idx = i;
4313 do {
4314 ret = new_to_user(cs->controls + idx,
4315 helpers[idx].ref->ctrl);
4316 idx = helpers[idx].next;
4317 } while (!ret && idx);
4318 }
4319 v4l2_ctrl_unlock(master);
4320 }
4321
4322 if (cs->count > ARRAY_SIZE(helper))
4323 kvfree(helpers);
4324 return ret;
4325 }
4326
4327 static int try_set_ext_ctrls(struct v4l2_fh *fh,
4328 struct v4l2_ctrl_handler *hdl,
4329 struct video_device *vdev,
4330 struct media_device *mdev,
4331 struct v4l2_ext_controls *cs, bool set)
4332 {
4333 struct media_request_object *obj = NULL;
4334 struct media_request *req = NULL;
4335 int ret;
4336
4337 if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
4338 if (!mdev) {
4339 dprintk(vdev, "%s: missing media device\n",
4340 video_device_node_name(vdev));
4341 return -EINVAL;
4342 }
4343
4344 if (cs->request_fd < 0) {
4345 dprintk(vdev, "%s: invalid request fd %d\n",
4346 video_device_node_name(vdev), cs->request_fd);
4347 return -EINVAL;
4348 }
4349
4350 req = media_request_get_by_fd(mdev, cs->request_fd);
4351 if (IS_ERR(req)) {
4352 dprintk(vdev, "%s: cannot find request fd %d\n",
4353 video_device_node_name(vdev), cs->request_fd);
4354 return PTR_ERR(req);
4355 }
4356
4357 ret = media_request_lock_for_update(req);
4358 if (ret) {
4359 dprintk(vdev, "%s: cannot lock request fd %d\n",
4360 video_device_node_name(vdev), cs->request_fd);
4361 media_request_put(req);
4362 return ret;
4363 }
4364
4365 obj = v4l2_ctrls_find_req_obj(hdl, req, set);
4366 if (IS_ERR(obj)) {
4367 dprintk(vdev,
4368 "%s: cannot find request object for request fd %d\n",
4369 video_device_node_name(vdev),
4370 cs->request_fd);
4371 media_request_unlock_for_update(req);
4372 media_request_put(req);
4373 return PTR_ERR(obj);
4374 }
4375 hdl = container_of(obj, struct v4l2_ctrl_handler,
4376 req_obj);
4377 }
4378
4379 ret = try_set_ext_ctrls_common(fh, hdl, cs, vdev, set);
4380 if (ret)
4381 dprintk(vdev,
4382 "%s: try_set_ext_ctrls_common failed (%d)\n",
4383 video_device_node_name(vdev), ret);
4384
4385 if (obj) {
4386 media_request_unlock_for_update(req);
4387 media_request_object_put(obj);
4388 media_request_put(req);
4389 }
4390
4391 return ret;
4392 }
4393
4394 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl,
4395 struct video_device *vdev,
4396 struct media_device *mdev,
4397 struct v4l2_ext_controls *cs)
4398 {
4399 return try_set_ext_ctrls(NULL, hdl, vdev, mdev, cs, false);
4400 }
4401 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
4402
4403 int v4l2_s_ext_ctrls(struct v4l2_fh *fh,
4404 struct v4l2_ctrl_handler *hdl,
4405 struct video_device *vdev,
4406 struct media_device *mdev,
4407 struct v4l2_ext_controls *cs)
4408 {
4409 return try_set_ext_ctrls(fh, hdl, vdev, mdev, cs, true);
4410 }
4411 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
4412
4413 /* Helper function for VIDIOC_S_CTRL compatibility */
4414 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
4415 {
4416 struct v4l2_ctrl *master = ctrl->cluster[0];
4417 int ret;
4418 int i;
4419
4420 /* Reset the 'is_new' flags of the cluster */
4421 for (i = 0; i < master->ncontrols; i++)
4422 if (master->cluster[i])
4423 master->cluster[i]->is_new = 0;
4424
4425 ret = validate_new(ctrl, ctrl->p_new);
4426 if (ret)
4427 return ret;
4428
4429 /* For autoclusters with volatiles that are switched from auto to
4430 manual mode we have to update the current volatile values since
4431 those will become the initial manual values after such a switch. */
4432 if (master->is_auto && master->has_volatiles && ctrl == master &&
4433 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
4434 update_from_auto_cluster(master);
4435
4436 ctrl->is_new = 1;
4437 return try_or_set_cluster(fh, master, true, ch_flags);
4438 }
4439
4440 /* Helper function for VIDIOC_S_CTRL compatibility */
4441 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
4442 struct v4l2_ext_control *c)
4443 {
4444 int ret;
4445
4446 v4l2_ctrl_lock(ctrl);
4447 user_to_new(c, ctrl);
4448 ret = set_ctrl(fh, ctrl, 0);
4449 if (!ret)
4450 cur_to_user(c, ctrl);
4451 v4l2_ctrl_unlock(ctrl);
4452 return ret;
4453 }
4454
4455 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
4456 struct v4l2_control *control)
4457 {
4458 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
4459 struct v4l2_ext_control c = { control->id };
4460 int ret;
4461
4462 if (ctrl == NULL || !ctrl->is_int)
4463 return -EINVAL;
4464
4465 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
4466 return -EACCES;
4467
4468 c.value = control->value;
4469 ret = set_ctrl_lock(fh, ctrl, &c);
4470 control->value = c.value;
4471 return ret;
4472 }
4473 EXPORT_SYMBOL(v4l2_s_ctrl);
4474
4475 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
4476 {
4477 lockdep_assert_held(ctrl->handler->lock);
4478
4479 /* It's a driver bug if this happens. */
4480 if (WARN_ON(!ctrl->is_int))
4481 return -EINVAL;
4482 ctrl->val = val;
4483 return set_ctrl(NULL, ctrl, 0);
4484 }
4485 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
4486
4487 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
4488 {
4489 lockdep_assert_held(ctrl->handler->lock);
4490
4491 /* It's a driver bug if this happens. */
4492 if (WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64))
4493 return -EINVAL;
4494 *ctrl->p_new.p_s64 = val;
4495 return set_ctrl(NULL, ctrl, 0);
4496 }
4497 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
4498
4499 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
4500 {
4501 lockdep_assert_held(ctrl->handler->lock);
4502
4503 /* It's a driver bug if this happens. */
4504 if (WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING))
4505 return -EINVAL;
4506 strscpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
4507 return set_ctrl(NULL, ctrl, 0);
4508 }
4509 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
4510
4511 int __v4l2_ctrl_s_ctrl_compound(struct v4l2_ctrl *ctrl,
4512 enum v4l2_ctrl_type type, const void *p)
4513 {
4514 lockdep_assert_held(ctrl->handler->lock);
4515
4516 /* It's a driver bug if this happens. */
4517 if (WARN_ON(ctrl->type != type))
4518 return -EINVAL;
4519 memcpy(ctrl->p_new.p, p, ctrl->elems * ctrl->elem_size);
4520 return set_ctrl(NULL, ctrl, 0);
4521 }
4522 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_compound);
4523
4524 void v4l2_ctrl_request_complete(struct media_request *req,
4525 struct v4l2_ctrl_handler *main_hdl)
4526 {
4527 struct media_request_object *obj;
4528 struct v4l2_ctrl_handler *hdl;
4529 struct v4l2_ctrl_ref *ref;
4530
4531 if (!req || !main_hdl)
4532 return;
4533
4534 /*
4535 * Note that it is valid if nothing was found. It means
4536 * that this request doesn't have any controls and so just
4537 * wants to leave the controls unchanged.
4538 */
4539 obj = media_request_object_find(req, &req_ops, main_hdl);
4540 if (!obj)
4541 return;
4542 hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
4543
4544 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
4545 struct v4l2_ctrl *ctrl = ref->ctrl;
4546 struct v4l2_ctrl *master = ctrl->cluster[0];
4547 unsigned int i;
4548
4549 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
4550 ref->req = ref;
4551
4552 v4l2_ctrl_lock(master);
4553 /* g_volatile_ctrl will update the current control values */
4554 for (i = 0; i < master->ncontrols; i++)
4555 cur_to_new(master->cluster[i]);
4556 call_op(master, g_volatile_ctrl);
4557 new_to_req(ref);
4558 v4l2_ctrl_unlock(master);
4559 continue;
4560 }
4561 if (ref->req == ref)
4562 continue;
4563
4564 v4l2_ctrl_lock(ctrl);
4565 if (ref->req) {
4566 ptr_to_ptr(ctrl, ref->req->p_req, ref->p_req);
4567 } else {
4568 ptr_to_ptr(ctrl, ctrl->p_cur, ref->p_req);
4569 /*
4570 * Set ref->req to ensure that when userspace wants to
4571 * obtain the controls of this request it will take
4572 * this value and not the current value of the control.
4573 */
4574 ref->req = ref;
4575 }
4576 v4l2_ctrl_unlock(ctrl);
4577 }
4578
4579 mutex_lock(main_hdl->lock);
4580 WARN_ON(!hdl->request_is_queued);
4581 list_del_init(&hdl->requests_queued);
4582 hdl->request_is_queued = false;
4583 mutex_unlock(main_hdl->lock);
4584 media_request_object_complete(obj);
4585 media_request_object_put(obj);
4586 }
4587 EXPORT_SYMBOL(v4l2_ctrl_request_complete);
4588
4589 int v4l2_ctrl_request_setup(struct media_request *req,
4590 struct v4l2_ctrl_handler *main_hdl)
4591 {
4592 struct media_request_object *obj;
4593 struct v4l2_ctrl_handler *hdl;
4594 struct v4l2_ctrl_ref *ref;
4595 int ret = 0;
4596
4597 if (!req || !main_hdl)
4598 return 0;
4599
4600 if (WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED))
4601 return -EBUSY;
4602
4603 /*
4604 * Note that it is valid if nothing was found. It means
4605 * that this request doesn't have any controls and so just
4606 * wants to leave the controls unchanged.
4607 */
4608 obj = media_request_object_find(req, &req_ops, main_hdl);
4609 if (!obj)
4610 return 0;
4611 if (obj->completed) {
4612 media_request_object_put(obj);
4613 return -EBUSY;
4614 }
4615 hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
4616
4617 list_for_each_entry(ref, &hdl->ctrl_refs, node)
4618 ref->req_done = false;
4619
4620 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
4621 struct v4l2_ctrl *ctrl = ref->ctrl;
4622 struct v4l2_ctrl *master = ctrl->cluster[0];
4623 bool have_new_data = false;
4624 int i;
4625
4626 /*
4627 * Skip if this control was already handled by a cluster.
4628 * Skip button controls and read-only controls.
4629 */
4630 if (ref->req_done || (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
4631 continue;
4632
4633 v4l2_ctrl_lock(master);
4634 for (i = 0; i < master->ncontrols; i++) {
4635 if (master->cluster[i]) {
4636 struct v4l2_ctrl_ref *r =
4637 find_ref(hdl, master->cluster[i]->id);
4638
4639 if (r->req && r == r->req) {
4640 have_new_data = true;
4641 break;
4642 }
4643 }
4644 }
4645 if (!have_new_data) {
4646 v4l2_ctrl_unlock(master);
4647 continue;
4648 }
4649
4650 for (i = 0; i < master->ncontrols; i++) {
4651 if (master->cluster[i]) {
4652 struct v4l2_ctrl_ref *r =
4653 find_ref(hdl, master->cluster[i]->id);
4654
4655 req_to_new(r);
4656 master->cluster[i]->is_new = 1;
4657 r->req_done = true;
4658 }
4659 }
4660 /*
4661 * For volatile autoclusters that are currently in auto mode
4662 * we need to discover if it will be set to manual mode.
4663 * If so, then we have to copy the current volatile values
4664 * first since those will become the new manual values (which
4665 * may be overwritten by explicit new values from this set
4666 * of controls).
4667 */
4668 if (master->is_auto && master->has_volatiles &&
4669 !is_cur_manual(master)) {
4670 s32 new_auto_val = *master->p_new.p_s32;
4671
4672 /*
4673 * If the new value == the manual value, then copy
4674 * the current volatile values.
4675 */
4676 if (new_auto_val == master->manual_mode_value)
4677 update_from_auto_cluster(master);
4678 }
4679
4680 ret = try_or_set_cluster(NULL, master, true, 0);
4681 v4l2_ctrl_unlock(master);
4682
4683 if (ret)
4684 break;
4685 }
4686
4687 media_request_object_put(obj);
4688 return ret;
4689 }
4690 EXPORT_SYMBOL(v4l2_ctrl_request_setup);
4691
4692 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
4693 {
4694 if (ctrl == NULL)
4695 return;
4696 if (notify == NULL) {
4697 ctrl->call_notify = 0;
4698 return;
4699 }
4700 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
4701 return;
4702 ctrl->handler->notify = notify;
4703 ctrl->handler->notify_priv = priv;
4704 ctrl->call_notify = 1;
4705 }
4706 EXPORT_SYMBOL(v4l2_ctrl_notify);
4707
4708 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
4709 s64 min, s64 max, u64 step, s64 def)
4710 {
4711 bool value_changed;
4712 bool range_changed = false;
4713 int ret;
4714
4715 lockdep_assert_held(ctrl->handler->lock);
4716
4717 switch (ctrl->type) {
4718 case V4L2_CTRL_TYPE_INTEGER:
4719 case V4L2_CTRL_TYPE_INTEGER64:
4720 case V4L2_CTRL_TYPE_BOOLEAN:
4721 case V4L2_CTRL_TYPE_MENU:
4722 case V4L2_CTRL_TYPE_INTEGER_MENU:
4723 case V4L2_CTRL_TYPE_BITMASK:
4724 case V4L2_CTRL_TYPE_U8:
4725 case V4L2_CTRL_TYPE_U16:
4726 case V4L2_CTRL_TYPE_U32:
4727 if (ctrl->is_array)
4728 return -EINVAL;
4729 ret = check_range(ctrl->type, min, max, step, def);
4730 if (ret)
4731 return ret;
4732 break;
4733 default:
4734 return -EINVAL;
4735 }
4736 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
4737 (ctrl->step != step) || ctrl->default_value != def) {
4738 range_changed = true;
4739 ctrl->minimum = min;
4740 ctrl->maximum = max;
4741 ctrl->step = step;
4742 ctrl->default_value = def;
4743 }
4744 cur_to_new(ctrl);
4745 if (validate_new(ctrl, ctrl->p_new)) {
4746 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4747 *ctrl->p_new.p_s64 = def;
4748 else
4749 *ctrl->p_new.p_s32 = def;
4750 }
4751
4752 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4753 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
4754 else
4755 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
4756 if (value_changed)
4757 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4758 else if (range_changed)
4759 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4760 return ret;
4761 }
4762 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
4763
4764 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
4765 {
4766 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4767
4768 if (ctrl == NULL)
4769 return -EINVAL;
4770
4771 v4l2_ctrl_lock(ctrl);
4772 list_add_tail(&sev->node, &ctrl->ev_subs);
4773 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
4774 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
4775 struct v4l2_event ev;
4776 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
4777
4778 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
4779 changes |= V4L2_EVENT_CTRL_CH_VALUE;
4780 fill_event(&ev, ctrl, changes);
4781 /* Mark the queue as active, allowing this initial
4782 event to be accepted. */
4783 sev->elems = elems;
4784 v4l2_event_queue_fh(sev->fh, &ev);
4785 }
4786 v4l2_ctrl_unlock(ctrl);
4787 return 0;
4788 }
4789
4790 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
4791 {
4792 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4793
4794 if (ctrl == NULL)
4795 return;
4796
4797 v4l2_ctrl_lock(ctrl);
4798 list_del(&sev->node);
4799 v4l2_ctrl_unlock(ctrl);
4800 }
4801
4802 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
4803 {
4804 u32 old_changes = old->u.ctrl.changes;
4805
4806 old->u.ctrl = new->u.ctrl;
4807 old->u.ctrl.changes |= old_changes;
4808 }
4809 EXPORT_SYMBOL(v4l2_ctrl_replace);
4810
4811 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
4812 {
4813 new->u.ctrl.changes |= old->u.ctrl.changes;
4814 }
4815 EXPORT_SYMBOL(v4l2_ctrl_merge);
4816
4817 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
4818 .add = v4l2_ctrl_add_event,
4819 .del = v4l2_ctrl_del_event,
4820 .replace = v4l2_ctrl_replace,
4821 .merge = v4l2_ctrl_merge,
4822 };
4823 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
4824
4825 int v4l2_ctrl_log_status(struct file *file, void *fh)
4826 {
4827 struct video_device *vfd = video_devdata(file);
4828 struct v4l2_fh *vfh = file->private_data;
4829
4830 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
4831 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
4832 vfd->v4l2_dev->name);
4833 return 0;
4834 }
4835 EXPORT_SYMBOL(v4l2_ctrl_log_status);
4836
4837 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
4838 const struct v4l2_event_subscription *sub)
4839 {
4840 if (sub->type == V4L2_EVENT_CTRL)
4841 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
4842 return -EINVAL;
4843 }
4844 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
4845
4846 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
4847 struct v4l2_event_subscription *sub)
4848 {
4849 if (!sd->ctrl_handler)
4850 return -EINVAL;
4851 return v4l2_ctrl_subscribe_event(fh, sub);
4852 }
4853 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
4854
4855 __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
4856 {
4857 struct v4l2_fh *fh = file->private_data;
4858
4859 poll_wait(file, &fh->wait, wait);
4860 if (v4l2_event_pending(fh))
4861 return EPOLLPRI;
4862 return 0;
4863 }
4864 EXPORT_SYMBOL(v4l2_ctrl_poll);
4865
4866 int v4l2_ctrl_new_fwnode_properties(struct v4l2_ctrl_handler *hdl,
4867 const struct v4l2_ctrl_ops *ctrl_ops,
4868 const struct v4l2_fwnode_device_properties *p)
4869 {
4870 if (p->orientation != V4L2_FWNODE_PROPERTY_UNSET) {
4871 u32 orientation_ctrl;
4872
4873 switch (p->orientation) {
4874 case V4L2_FWNODE_ORIENTATION_FRONT:
4875 orientation_ctrl = V4L2_CAMERA_ORIENTATION_FRONT;
4876 break;
4877 case V4L2_FWNODE_ORIENTATION_BACK:
4878 orientation_ctrl = V4L2_CAMERA_ORIENTATION_BACK;
4879 break;
4880 case V4L2_FWNODE_ORIENTATION_EXTERNAL:
4881 orientation_ctrl = V4L2_CAMERA_ORIENTATION_EXTERNAL;
4882 break;
4883 default:
4884 return -EINVAL;
4885 }
4886 if (!v4l2_ctrl_new_std_menu(hdl, ctrl_ops,
4887 V4L2_CID_CAMERA_ORIENTATION,
4888 V4L2_CAMERA_ORIENTATION_EXTERNAL, 0,
4889 orientation_ctrl))
4890 return hdl->error;
4891 }
4892
4893 if (p->rotation != V4L2_FWNODE_PROPERTY_UNSET) {
4894 if (!v4l2_ctrl_new_std(hdl, ctrl_ops,
4895 V4L2_CID_CAMERA_SENSOR_ROTATION,
4896 p->rotation, p->rotation, 1,
4897 p->rotation))
4898 return hdl->error;
4899 }
4900
4901 return hdl->error;
4902 }
4903 EXPORT_SYMBOL(v4l2_ctrl_new_fwnode_properties);
Linux with added FPC-III support