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Merge tag 'extcon-next-for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / drivers / media / v4l2-core / v4l2-ctrls.c
blob371537dd8cd345cb075814b427aa77cdc959dca5
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 #include <linux/ctype.h>
10 #include <linux/mm.h>
11 #include <linux/slab.h>
12 #include <linux/export.h>
13 #include <media/v4l2-ioctl.h>
14 #include <media/v4l2-device.h>
15 #include <media/v4l2-ctrls.h>
16 #include <media/v4l2-event.h>
17 #include <media/v4l2-dev.h>
18
19 #define has_op(master, op) \
20 (master->ops && master->ops->op)
21 #define call_op(master, op) \
22 (has_op(master, op) ? master->ops->op(master) : 0)
23
24 /* Internal temporary helper struct, one for each v4l2_ext_control */
25 struct v4l2_ctrl_helper {
26 /* Pointer to the control reference of the master control */
27 struct v4l2_ctrl_ref *mref;
28 /* The control ref corresponding to the v4l2_ext_control ID field. */
29 struct v4l2_ctrl_ref *ref;
30 /* v4l2_ext_control index of the next control belonging to the
31 same cluster, or 0 if there isn't any. */
32 u32 next;
33 };
34
35 /* Small helper function to determine if the autocluster is set to manual
36 mode. */
37 static bool is_cur_manual(const struct v4l2_ctrl *master)
38 {
39 return master->is_auto && master->cur.val == master->manual_mode_value;
40 }
41
42 /* Same as above, but this checks the against the new value instead of the
43 current value. */
44 static bool is_new_manual(const struct v4l2_ctrl *master)
45 {
46 return master->is_auto && master->val == master->manual_mode_value;
47 }
48
49 /* Returns NULL or a character pointer array containing the menu for
50 the given control ID. The pointer array ends with a NULL pointer.
51 An empty string signifies a menu entry that is invalid. This allows
52 drivers to disable certain options if it is not supported. */
53 const char * const *v4l2_ctrl_get_menu(u32 id)
54 {
55 static const char * const mpeg_audio_sampling_freq[] = {
56 "44.1 kHz",
57 "48 kHz",
58 "32 kHz",
59 NULL
60 };
61 static const char * const mpeg_audio_encoding[] = {
62 "MPEG-1/2 Layer I",
63 "MPEG-1/2 Layer II",
64 "MPEG-1/2 Layer III",
65 "MPEG-2/4 AAC",
66 "AC-3",
67 NULL
68 };
69 static const char * const mpeg_audio_l1_bitrate[] = {
70 "32 kbps",
71 "64 kbps",
72 "96 kbps",
73 "128 kbps",
74 "160 kbps",
75 "192 kbps",
76 "224 kbps",
77 "256 kbps",
78 "288 kbps",
79 "320 kbps",
80 "352 kbps",
81 "384 kbps",
82 "416 kbps",
83 "448 kbps",
84 NULL
85 };
86 static const char * const mpeg_audio_l2_bitrate[] = {
87 "32 kbps",
88 "48 kbps",
89 "56 kbps",
90 "64 kbps",
91 "80 kbps",
92 "96 kbps",
93 "112 kbps",
94 "128 kbps",
95 "160 kbps",
96 "192 kbps",
97 "224 kbps",
98 "256 kbps",
99 "320 kbps",
100 "384 kbps",
101 NULL
102 };
103 static const char * const mpeg_audio_l3_bitrate[] = {
104 "32 kbps",
105 "40 kbps",
106 "48 kbps",
107 "56 kbps",
108 "64 kbps",
109 "80 kbps",
110 "96 kbps",
111 "112 kbps",
112 "128 kbps",
113 "160 kbps",
114 "192 kbps",
115 "224 kbps",
116 "256 kbps",
117 "320 kbps",
118 NULL
119 };
120 static const char * const mpeg_audio_ac3_bitrate[] = {
121 "32 kbps",
122 "40 kbps",
123 "48 kbps",
124 "56 kbps",
125 "64 kbps",
126 "80 kbps",
127 "96 kbps",
128 "112 kbps",
129 "128 kbps",
130 "160 kbps",
131 "192 kbps",
132 "224 kbps",
133 "256 kbps",
134 "320 kbps",
135 "384 kbps",
136 "448 kbps",
137 "512 kbps",
138 "576 kbps",
139 "640 kbps",
140 NULL
141 };
142 static const char * const mpeg_audio_mode[] = {
143 "Stereo",
144 "Joint Stereo",
145 "Dual",
146 "Mono",
147 NULL
148 };
149 static const char * const mpeg_audio_mode_extension[] = {
150 "Bound 4",
151 "Bound 8",
152 "Bound 12",
153 "Bound 16",
154 NULL
155 };
156 static const char * const mpeg_audio_emphasis[] = {
157 "No Emphasis",
158 "50/15 us",
159 "CCITT J17",
160 NULL
161 };
162 static const char * const mpeg_audio_crc[] = {
163 "No CRC",
164 "16-bit CRC",
165 NULL
166 };
167 static const char * const mpeg_audio_dec_playback[] = {
168 "Auto",
169 "Stereo",
170 "Left",
171 "Right",
172 "Mono",
173 "Swapped Stereo",
174 NULL
175 };
176 static const char * const mpeg_video_encoding[] = {
177 "MPEG-1",
178 "MPEG-2",
179 "MPEG-4 AVC",
180 NULL
181 };
182 static const char * const mpeg_video_aspect[] = {
183 "1x1",
184 "4x3",
185 "16x9",
186 "2.21x1",
187 NULL
188 };
189 static const char * const mpeg_video_bitrate_mode[] = {
190 "Variable Bitrate",
191 "Constant Bitrate",
192 NULL
193 };
194 static const char * const mpeg_stream_type[] = {
195 "MPEG-2 Program Stream",
196 "MPEG-2 Transport Stream",
197 "MPEG-1 System Stream",
198 "MPEG-2 DVD-compatible Stream",
199 "MPEG-1 VCD-compatible Stream",
200 "MPEG-2 SVCD-compatible Stream",
201 NULL
202 };
203 static const char * const mpeg_stream_vbi_fmt[] = {
204 "No VBI",
205 "Private Packet, IVTV Format",
206 NULL
207 };
208 static const char * const camera_power_line_frequency[] = {
209 "Disabled",
210 "50 Hz",
211 "60 Hz",
212 "Auto",
213 NULL
214 };
215 static const char * const camera_exposure_auto[] = {
216 "Auto Mode",
217 "Manual Mode",
218 "Shutter Priority Mode",
219 "Aperture Priority Mode",
220 NULL
221 };
222 static const char * const camera_exposure_metering[] = {
223 "Average",
224 "Center Weighted",
225 "Spot",
226 "Matrix",
227 NULL
228 };
229 static const char * const camera_auto_focus_range[] = {
230 "Auto",
231 "Normal",
232 "Macro",
233 "Infinity",
234 NULL
235 };
236 static const char * const colorfx[] = {
237 "None",
238 "Black & White",
239 "Sepia",
240 "Negative",
241 "Emboss",
242 "Sketch",
243 "Sky Blue",
244 "Grass Green",
245 "Skin Whiten",
246 "Vivid",
247 "Aqua",
248 "Art Freeze",
249 "Silhouette",
250 "Solarization",
251 "Antique",
252 "Set Cb/Cr",
253 NULL
254 };
255 static const char * const auto_n_preset_white_balance[] = {
256 "Manual",
257 "Auto",
258 "Incandescent",
259 "Fluorescent",
260 "Fluorescent H",
261 "Horizon",
262 "Daylight",
263 "Flash",
264 "Cloudy",
265 "Shade",
266 NULL,
267 };
268 static const char * const camera_iso_sensitivity_auto[] = {
269 "Manual",
270 "Auto",
271 NULL
272 };
273 static const char * const scene_mode[] = {
274 "None",
275 "Backlight",
276 "Beach/Snow",
277 "Candle Light",
278 "Dusk/Dawn",
279 "Fall Colors",
280 "Fireworks",
281 "Landscape",
282 "Night",
283 "Party/Indoor",
284 "Portrait",
285 "Sports",
286 "Sunset",
287 "Text",
288 NULL
289 };
290 static const char * const tune_emphasis[] = {
291 "None",
292 "50 Microseconds",
293 "75 Microseconds",
294 NULL,
295 };
296 static const char * const header_mode[] = {
297 "Separate Buffer",
298 "Joined With 1st Frame",
299 NULL,
300 };
301 static const char * const multi_slice[] = {
302 "Single",
303 "Max Macroblocks",
304 "Max Bytes",
305 NULL,
306 };
307 static const char * const entropy_mode[] = {
308 "CAVLC",
309 "CABAC",
310 NULL,
311 };
312 static const char * const mpeg_h264_level[] = {
313 "1",
314 "1b",
315 "1.1",
316 "1.2",
317 "1.3",
318 "2",
319 "2.1",
320 "2.2",
321 "3",
322 "3.1",
323 "3.2",
324 "4",
325 "4.1",
326 "4.2",
327 "5",
328 "5.1",
329 NULL,
330 };
331 static const char * const h264_loop_filter[] = {
332 "Enabled",
333 "Disabled",
334 "Disabled at Slice Boundary",
335 NULL,
336 };
337 static const char * const h264_profile[] = {
338 "Baseline",
339 "Constrained Baseline",
340 "Main",
341 "Extended",
342 "High",
343 "High 10",
344 "High 422",
345 "High 444 Predictive",
346 "High 10 Intra",
347 "High 422 Intra",
348 "High 444 Intra",
349 "CAVLC 444 Intra",
350 "Scalable Baseline",
351 "Scalable High",
352 "Scalable High Intra",
353 "Stereo High",
354 "Multiview High",
355 NULL,
356 };
357 static const char * const vui_sar_idc[] = {
358 "Unspecified",
359 "1:1",
360 "12:11",
361 "10:11",
362 "16:11",
363 "40:33",
364 "24:11",
365 "20:11",
366 "32:11",
367 "80:33",
368 "18:11",
369 "15:11",
370 "64:33",
371 "160:99",
372 "4:3",
373 "3:2",
374 "2:1",
375 "Extended SAR",
376 NULL,
377 };
378 static const char * const h264_fp_arrangement_type[] = {
379 "Checkerboard",
380 "Column",
381 "Row",
382 "Side by Side",
383 "Top Bottom",
384 "Temporal",
385 NULL,
386 };
387 static const char * const h264_fmo_map_type[] = {
388 "Interleaved Slices",
389 "Scattered Slices",
390 "Foreground with Leftover",
391 "Box Out",
392 "Raster Scan",
393 "Wipe Scan",
394 "Explicit",
395 NULL,
396 };
397 static const char * const mpeg_mpeg2_level[] = {
398 "Low",
399 "Main",
400 "High 1440",
401 "High",
402 NULL,
403 };
404 static const char * const mpeg2_profile[] = {
405 "Simple",
406 "Main",
407 "SNR Scalable",
408 "Spatially Scalable",
409 "High",
410 NULL,
411 };
412 static const char * const mpeg_mpeg4_level[] = {
413 "0",
414 "0b",
415 "1",
416 "2",
417 "3",
418 "3b",
419 "4",
420 "5",
421 NULL,
422 };
423 static const char * const mpeg4_profile[] = {
424 "Simple",
425 "Advanced Simple",
426 "Core",
427 "Simple Scalable",
428 "Advanced Coding Efficiency",
429 NULL,
430 };
431
432 static const char * const vpx_golden_frame_sel[] = {
433 "Use Previous Frame",
434 "Use Previous Specific Frame",
435 NULL,
436 };
437 static const char * const vp8_profile[] = {
438 "0",
439 "1",
440 "2",
441 "3",
442 NULL,
443 };
444 static const char * const vp9_profile[] = {
445 "0",
446 "1",
447 "2",
448 "3",
449 NULL,
450 };
451
452 static const char * const flash_led_mode[] = {
453 "Off",
454 "Flash",
455 "Torch",
456 NULL,
457 };
458 static const char * const flash_strobe_source[] = {
459 "Software",
460 "External",
461 NULL,
462 };
463
464 static const char * const jpeg_chroma_subsampling[] = {
465 "4:4:4",
466 "4:2:2",
467 "4:2:0",
468 "4:1:1",
469 "4:1:0",
470 "Gray",
471 NULL,
472 };
473 static const char * const dv_tx_mode[] = {
474 "DVI-D",
475 "HDMI",
476 NULL,
477 };
478 static const char * const dv_rgb_range[] = {
479 "Automatic",
480 "RGB Limited Range (16-235)",
481 "RGB Full Range (0-255)",
482 NULL,
483 };
484 static const char * const dv_it_content_type[] = {
485 "Graphics",
486 "Photo",
487 "Cinema",
488 "Game",
489 "No IT Content",
490 NULL,
491 };
492 static const char * const detect_md_mode[] = {
493 "Disabled",
494 "Global",
495 "Threshold Grid",
496 "Region Grid",
497 NULL,
498 };
499
500 static const char * const hevc_profile[] = {
501 "Main",
502 "Main Still Picture",
503 "Main 10",
504 NULL,
505 };
506 static const char * const hevc_level[] = {
507 "1",
508 "2",
509 "2.1",
510 "3",
511 "3.1",
512 "4",
513 "4.1",
514 "5",
515 "5.1",
516 "5.2",
517 "6",
518 "6.1",
519 "6.2",
520 NULL,
521 };
522 static const char * const hevc_hierarchial_coding_type[] = {
523 "B",
524 "P",
525 NULL,
526 };
527 static const char * const hevc_refresh_type[] = {
528 "None",
529 "CRA",
530 "IDR",
531 NULL,
532 };
533 static const char * const hevc_size_of_length_field[] = {
534 "0",
535 "1",
536 "2",
537 "4",
538 NULL,
539 };
540 static const char * const hevc_tier[] = {
541 "Main",
542 "High",
543 NULL,
544 };
545 static const char * const hevc_loop_filter_mode[] = {
546 "Disabled",
547 "Enabled",
548 "Disabled at slice boundary",
549 "NULL",
550 };
551
552 switch (id) {
553 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
554 return mpeg_audio_sampling_freq;
555 case V4L2_CID_MPEG_AUDIO_ENCODING:
556 return mpeg_audio_encoding;
557 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
558 return mpeg_audio_l1_bitrate;
559 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
560 return mpeg_audio_l2_bitrate;
561 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
562 return mpeg_audio_l3_bitrate;
563 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
564 return mpeg_audio_ac3_bitrate;
565 case V4L2_CID_MPEG_AUDIO_MODE:
566 return mpeg_audio_mode;
567 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
568 return mpeg_audio_mode_extension;
569 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
570 return mpeg_audio_emphasis;
571 case V4L2_CID_MPEG_AUDIO_CRC:
572 return mpeg_audio_crc;
573 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
574 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
575 return mpeg_audio_dec_playback;
576 case V4L2_CID_MPEG_VIDEO_ENCODING:
577 return mpeg_video_encoding;
578 case V4L2_CID_MPEG_VIDEO_ASPECT:
579 return mpeg_video_aspect;
580 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
581 return mpeg_video_bitrate_mode;
582 case V4L2_CID_MPEG_STREAM_TYPE:
583 return mpeg_stream_type;
584 case V4L2_CID_MPEG_STREAM_VBI_FMT:
585 return mpeg_stream_vbi_fmt;
586 case V4L2_CID_POWER_LINE_FREQUENCY:
587 return camera_power_line_frequency;
588 case V4L2_CID_EXPOSURE_AUTO:
589 return camera_exposure_auto;
590 case V4L2_CID_EXPOSURE_METERING:
591 return camera_exposure_metering;
592 case V4L2_CID_AUTO_FOCUS_RANGE:
593 return camera_auto_focus_range;
594 case V4L2_CID_COLORFX:
595 return colorfx;
596 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
597 return auto_n_preset_white_balance;
598 case V4L2_CID_ISO_SENSITIVITY_AUTO:
599 return camera_iso_sensitivity_auto;
600 case V4L2_CID_SCENE_MODE:
601 return scene_mode;
602 case V4L2_CID_TUNE_PREEMPHASIS:
603 return tune_emphasis;
604 case V4L2_CID_TUNE_DEEMPHASIS:
605 return tune_emphasis;
606 case V4L2_CID_FLASH_LED_MODE:
607 return flash_led_mode;
608 case V4L2_CID_FLASH_STROBE_SOURCE:
609 return flash_strobe_source;
610 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
611 return header_mode;
612 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
613 return multi_slice;
614 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
615 return entropy_mode;
616 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
617 return mpeg_h264_level;
618 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
619 return h264_loop_filter;
620 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
621 return h264_profile;
622 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
623 return vui_sar_idc;
624 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
625 return h264_fp_arrangement_type;
626 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
627 return h264_fmo_map_type;
628 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
629 return mpeg_mpeg2_level;
630 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
631 return mpeg2_profile;
632 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
633 return mpeg_mpeg4_level;
634 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
635 return mpeg4_profile;
636 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
637 return vpx_golden_frame_sel;
638 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
639 return vp8_profile;
640 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
641 return vp9_profile;
642 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
643 return jpeg_chroma_subsampling;
644 case V4L2_CID_DV_TX_MODE:
645 return dv_tx_mode;
646 case V4L2_CID_DV_TX_RGB_RANGE:
647 case V4L2_CID_DV_RX_RGB_RANGE:
648 return dv_rgb_range;
649 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
650 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
651 return dv_it_content_type;
652 case V4L2_CID_DETECT_MD_MODE:
653 return detect_md_mode;
654 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
655 return hevc_profile;
656 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
657 return hevc_level;
658 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
659 return hevc_hierarchial_coding_type;
660 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
661 return hevc_refresh_type;
662 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
663 return hevc_size_of_length_field;
664 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
665 return hevc_tier;
666 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
667 return hevc_loop_filter_mode;
668
669 default:
670 return NULL;
671 }
672 }
673 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
674
675 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
676 /*
677 * Returns NULL or an s64 type array containing the menu for given
678 * control ID. The total number of the menu items is returned in @len.
679 */
680 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
681 {
682 static const s64 qmenu_int_vpx_num_partitions[] = {
683 1, 2, 4, 8,
684 };
685
686 static const s64 qmenu_int_vpx_num_ref_frames[] = {
687 1, 2, 3,
688 };
689
690 switch (id) {
691 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
692 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
693 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
694 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
695 default:
696 *len = 0;
697 return NULL;
698 }
699 }
700 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
701
702 /* Return the control name. */
703 const char *v4l2_ctrl_get_name(u32 id)
704 {
705 switch (id) {
706 /* USER controls */
707 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
708 case V4L2_CID_USER_CLASS: return "User Controls";
709 case V4L2_CID_BRIGHTNESS: return "Brightness";
710 case V4L2_CID_CONTRAST: return "Contrast";
711 case V4L2_CID_SATURATION: return "Saturation";
712 case V4L2_CID_HUE: return "Hue";
713 case V4L2_CID_AUDIO_VOLUME: return "Volume";
714 case V4L2_CID_AUDIO_BALANCE: return "Balance";
715 case V4L2_CID_AUDIO_BASS: return "Bass";
716 case V4L2_CID_AUDIO_TREBLE: return "Treble";
717 case V4L2_CID_AUDIO_MUTE: return "Mute";
718 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
719 case V4L2_CID_BLACK_LEVEL: return "Black Level";
720 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
721 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
722 case V4L2_CID_RED_BALANCE: return "Red Balance";
723 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
724 case V4L2_CID_GAMMA: return "Gamma";
725 case V4L2_CID_EXPOSURE: return "Exposure";
726 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
727 case V4L2_CID_GAIN: return "Gain";
728 case V4L2_CID_HFLIP: return "Horizontal Flip";
729 case V4L2_CID_VFLIP: return "Vertical Flip";
730 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
731 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
732 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
733 case V4L2_CID_SHARPNESS: return "Sharpness";
734 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
735 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
736 case V4L2_CID_COLOR_KILLER: return "Color Killer";
737 case V4L2_CID_COLORFX: return "Color Effects";
738 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
739 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
740 case V4L2_CID_ROTATE: return "Rotate";
741 case V4L2_CID_BG_COLOR: return "Background Color";
742 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
743 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
744 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
745 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
746 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
747 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
748 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
749
750 /* Codec controls */
751 /* The MPEG controls are applicable to all codec controls
752 * and the 'MPEG' part of the define is historical */
753 /* Keep the order of the 'case's the same as in videodev2.h! */
754 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
755 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
756 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
757 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
758 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
759 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
760 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
761 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
762 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
763 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
764 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
765 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
766 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
767 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
768 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
769 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
770 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
771 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
772 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
773 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
774 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
775 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
776 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
777 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
778 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
779 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
780 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
781 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
782 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
783 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
784 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
785 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
786 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
787 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
788 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
789 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
790 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
791 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
792 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
793 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
794 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
795 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
796 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
797 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
798 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
799 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
800 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
801 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
802 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
803 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
804 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
805 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
806 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
807 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
808 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
809 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
810 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
811 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
812 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
813 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
814 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
815 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
816 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
817 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
818 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
819 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
820 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
821 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
822 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
823 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
824 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
825 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
826 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
827 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
828 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
829 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
830 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
831 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
832 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
833 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
834 return "H264 Set QP Value for HC Layers";
835 case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
836 return "H264 Constrained Intra Pred";
837 case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET: return "H264 Chroma QP Index Offset";
838 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP: return "H264 I-Frame Minimum QP Value";
839 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP: return "H264 I-Frame Maximum QP Value";
840 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP: return "H264 P-Frame Minimum QP Value";
841 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP: return "H264 P-Frame Maximum QP Value";
842 case V4L2_CID_MPEG_VIDEO_H264_SPS: return "H264 Sequence Parameter Set";
843 case V4L2_CID_MPEG_VIDEO_H264_PPS: return "H264 Picture Parameter Set";
844 case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX: return "H264 Scaling Matrix";
845 case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS: return "H264 Slice Parameters";
846 case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS: return "H264 Decode Parameters";
847 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL: return "MPEG2 Level";
848 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE: return "MPEG2 Profile";
849 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
850 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
851 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
852 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
853 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
854 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
855 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
856 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
857 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
858 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
859 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
860 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
861 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
862 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
863 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
864 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
865 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
866 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
867 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
868 case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS: return "MPEG-2 Slice Parameters";
869 case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION: return "MPEG-2 Quantization Matrices";
870 case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS: return "FWHT Stateless Parameters";
871 case V4L2_CID_FWHT_I_FRAME_QP: return "FWHT I-Frame QP Value";
872 case V4L2_CID_FWHT_P_FRAME_QP: return "FWHT P-Frame QP Value";
873
874 /* VPX controls */
875 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
876 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
877 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
878 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
879 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
880 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
881 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
882 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
883 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
884 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
885 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
886 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE: return "VP8 Profile";
887 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE: return "VP9 Profile";
888
889 /* HEVC controls */
890 case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP: return "HEVC I-Frame QP Value";
891 case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP: return "HEVC P-Frame QP Value";
892 case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP: return "HEVC B-Frame QP Value";
893 case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP: return "HEVC Minimum QP Value";
894 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP: return "HEVC Maximum QP Value";
895 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE: return "HEVC Profile";
896 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL: return "HEVC Level";
897 case V4L2_CID_MPEG_VIDEO_HEVC_TIER: return "HEVC Tier";
898 case V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION: return "HEVC Frame Rate Resolution";
899 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH: return "HEVC Maximum Coding Unit Depth";
900 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE: return "HEVC Refresh Type";
901 case V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED: return "HEVC Constant Intra Prediction";
902 case V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU: return "HEVC Lossless Encoding";
903 case V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT: return "HEVC Wavefront";
904 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE: return "HEVC Loop Filter";
905 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP: return "HEVC QP Values";
906 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE: return "HEVC Hierarchical Coding Type";
907 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER: return "HEVC Hierarchical Coding Layer";
908 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP: return "HEVC Hierarchical Layer 0 QP";
909 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP: return "HEVC Hierarchical Layer 1 QP";
910 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP: return "HEVC Hierarchical Layer 2 QP";
911 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP: return "HEVC Hierarchical Layer 3 QP";
912 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP: return "HEVC Hierarchical Layer 4 QP";
913 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP: return "HEVC Hierarchical Layer 5 QP";
914 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP: return "HEVC Hierarchical Layer 6 QP";
915 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR: return "HEVC Hierarchical Lay 0 BitRate";
916 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR: return "HEVC Hierarchical Lay 1 BitRate";
917 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR: return "HEVC Hierarchical Lay 2 BitRate";
918 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR: return "HEVC Hierarchical Lay 3 BitRate";
919 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR: return "HEVC Hierarchical Lay 4 BitRate";
920 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR: return "HEVC Hierarchical Lay 5 BitRate";
921 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR: return "HEVC Hierarchical Lay 6 BitRate";
922 case V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB: return "HEVC General PB";
923 case V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID: return "HEVC Temporal ID";
924 case V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING: return "HEVC Strong Intra Smoothing";
925 case V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT: return "HEVC Intra PU Split";
926 case V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION: return "HEVC TMV Prediction";
927 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1: return "HEVC Max Num of Candidate MVs";
928 case V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE: return "HEVC ENC Without Startcode";
929 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD: return "HEVC Num of I-Frame b/w 2 IDR";
930 case V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2: return "HEVC Loop Filter Beta Offset";
931 case V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2: return "HEVC Loop Filter TC Offset";
932 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD: return "HEVC Size of Length Field";
933 case V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES: return "Reference Frames for a P-Frame";
934 case V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR: return "Prepend SPS and PPS to IDR";
935
936 /* CAMERA controls */
937 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
938 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
939 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
940 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
941 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
942 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
943 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
944 case V4L2_CID_PAN_RESET: return "Pan, Reset";
945 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
946 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
947 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
948 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
949 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
950 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
951 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
952 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
953 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
954 case V4L2_CID_PRIVACY: return "Privacy";
955 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
956 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
957 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
958 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
959 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
960 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
961 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
962 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
963 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
964 case V4L2_CID_SCENE_MODE: return "Scene Mode";
965 case V4L2_CID_3A_LOCK: return "3A Lock";
966 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
967 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
968 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
969 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
970 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
971 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
972
973 /* FM Radio Modulator controls */
974 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
975 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
976 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
977 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
978 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
979 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
980 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
981 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
982 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
983 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
984 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
985 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
986 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
987 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
988 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
989 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
990 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
991 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
992 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
993 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
994 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
995 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
996 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
997 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
998 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
999 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
1000 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
1001 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
1002 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
1003 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
1004
1005 /* Flash controls */
1006 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1007 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
1008 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
1009 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
1010 case V4L2_CID_FLASH_STROBE: return "Strobe";
1011 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
1012 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
1013 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
1014 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
1015 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
1016 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
1017 case V4L2_CID_FLASH_FAULT: return "Faults";
1018 case V4L2_CID_FLASH_CHARGE: return "Charge";
1019 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
1020
1021 /* JPEG encoder controls */
1022 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1023 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
1024 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
1025 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
1026 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
1027 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
1028
1029 /* Image source controls */
1030 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1031 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
1032 case V4L2_CID_VBLANK: return "Vertical Blanking";
1033 case V4L2_CID_HBLANK: return "Horizontal Blanking";
1034 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
1035 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
1036 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
1037 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
1038 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
1039
1040 /* Image processing controls */
1041 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1042 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
1043 case V4L2_CID_LINK_FREQ: return "Link Frequency";
1044 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
1045 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
1046 case V4L2_CID_DEINTERLACING_MODE: return "Deinterlacing Mode";
1047 case V4L2_CID_DIGITAL_GAIN: return "Digital Gain";
1048
1049 /* DV controls */
1050 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1051 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
1052 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
1053 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
1054 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
1055 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
1056 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
1057 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
1058 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
1059 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
1060 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
1061
1062 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
1063 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
1064 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
1065 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
1066 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
1067 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
1068 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
1069 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
1070 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
1071 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
1072 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
1073 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
1074 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
1075 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
1076 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
1077 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
1078 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
1079 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1080 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
1081 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
1082
1083 /* Detection controls */
1084 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1085 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
1086 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
1087 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
1088 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
1089 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
1090 default:
1091 return NULL;
1092 }
1093 }
1094 EXPORT_SYMBOL(v4l2_ctrl_get_name);
1095
1096 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
1097 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
1098 {
1099 *name = v4l2_ctrl_get_name(id);
1100 *flags = 0;
1101
1102 switch (id) {
1103 case V4L2_CID_AUDIO_MUTE:
1104 case V4L2_CID_AUDIO_LOUDNESS:
1105 case V4L2_CID_AUTO_WHITE_BALANCE:
1106 case V4L2_CID_AUTOGAIN:
1107 case V4L2_CID_HFLIP:
1108 case V4L2_CID_VFLIP:
1109 case V4L2_CID_HUE_AUTO:
1110 case V4L2_CID_CHROMA_AGC:
1111 case V4L2_CID_COLOR_KILLER:
1112 case V4L2_CID_AUTOBRIGHTNESS:
1113 case V4L2_CID_MPEG_AUDIO_MUTE:
1114 case V4L2_CID_MPEG_VIDEO_MUTE:
1115 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
1116 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
1117 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
1118 case V4L2_CID_FOCUS_AUTO:
1119 case V4L2_CID_PRIVACY:
1120 case V4L2_CID_AUDIO_LIMITER_ENABLED:
1121 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
1122 case V4L2_CID_PILOT_TONE_ENABLED:
1123 case V4L2_CID_ILLUMINATORS_1:
1124 case V4L2_CID_ILLUMINATORS_2:
1125 case V4L2_CID_FLASH_STROBE_STATUS:
1126 case V4L2_CID_FLASH_CHARGE:
1127 case V4L2_CID_FLASH_READY:
1128 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
1129 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
1130 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
1131 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
1132 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
1133 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
1134 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
1135 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
1136 case V4L2_CID_WIDE_DYNAMIC_RANGE:
1137 case V4L2_CID_IMAGE_STABILIZATION:
1138 case V4L2_CID_RDS_RECEPTION:
1139 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
1140 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
1141 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
1142 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
1143 case V4L2_CID_RF_TUNER_PLL_LOCK:
1144 case V4L2_CID_RDS_TX_MONO_STEREO:
1145 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
1146 case V4L2_CID_RDS_TX_COMPRESSED:
1147 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
1148 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
1149 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
1150 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
1151 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
1152 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1153 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1154 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1155 *type = V4L2_CTRL_TYPE_BOOLEAN;
1156 *min = 0;
1157 *max = *step = 1;
1158 break;
1159 case V4L2_CID_ROTATE:
1160 *type = V4L2_CTRL_TYPE_INTEGER;
1161 *flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
1162 break;
1163 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1164 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1165 *type = V4L2_CTRL_TYPE_INTEGER;
1166 break;
1167 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1168 case V4L2_CID_PAN_RESET:
1169 case V4L2_CID_TILT_RESET:
1170 case V4L2_CID_FLASH_STROBE:
1171 case V4L2_CID_FLASH_STROBE_STOP:
1172 case V4L2_CID_AUTO_FOCUS_START:
1173 case V4L2_CID_AUTO_FOCUS_STOP:
1174 case V4L2_CID_DO_WHITE_BALANCE:
1175 *type = V4L2_CTRL_TYPE_BUTTON;
1176 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1177 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1178 *min = *max = *step = *def = 0;
1179 break;
1180 case V4L2_CID_POWER_LINE_FREQUENCY:
1181 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1182 case V4L2_CID_MPEG_AUDIO_ENCODING:
1183 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1184 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1185 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1186 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1187 case V4L2_CID_MPEG_AUDIO_MODE:
1188 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1189 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1190 case V4L2_CID_MPEG_AUDIO_CRC:
1191 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1192 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1193 case V4L2_CID_MPEG_VIDEO_ENCODING:
1194 case V4L2_CID_MPEG_VIDEO_ASPECT:
1195 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1196 case V4L2_CID_MPEG_STREAM_TYPE:
1197 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1198 case V4L2_CID_EXPOSURE_AUTO:
1199 case V4L2_CID_AUTO_FOCUS_RANGE:
1200 case V4L2_CID_COLORFX:
1201 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1202 case V4L2_CID_TUNE_PREEMPHASIS:
1203 case V4L2_CID_FLASH_LED_MODE:
1204 case V4L2_CID_FLASH_STROBE_SOURCE:
1205 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1206 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1207 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1208 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1209 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1210 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1211 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1212 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1213 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1214 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
1215 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
1216 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1217 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1218 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1219 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1220 case V4L2_CID_EXPOSURE_METERING:
1221 case V4L2_CID_SCENE_MODE:
1222 case V4L2_CID_DV_TX_MODE:
1223 case V4L2_CID_DV_TX_RGB_RANGE:
1224 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1225 case V4L2_CID_DV_RX_RGB_RANGE:
1226 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1227 case V4L2_CID_TEST_PATTERN:
1228 case V4L2_CID_DEINTERLACING_MODE:
1229 case V4L2_CID_TUNE_DEEMPHASIS:
1230 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1231 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
1232 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
1233 case V4L2_CID_DETECT_MD_MODE:
1234 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
1235 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
1236 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
1237 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
1238 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
1239 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
1240 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
1241 *type = V4L2_CTRL_TYPE_MENU;
1242 break;
1243 case V4L2_CID_LINK_FREQ:
1244 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1245 break;
1246 case V4L2_CID_RDS_TX_PS_NAME:
1247 case V4L2_CID_RDS_TX_RADIO_TEXT:
1248 case V4L2_CID_RDS_RX_PS_NAME:
1249 case V4L2_CID_RDS_RX_RADIO_TEXT:
1250 *type = V4L2_CTRL_TYPE_STRING;
1251 break;
1252 case V4L2_CID_ISO_SENSITIVITY:
1253 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1254 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1255 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1256 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1257 break;
1258 case V4L2_CID_USER_CLASS:
1259 case V4L2_CID_CAMERA_CLASS:
1260 case V4L2_CID_MPEG_CLASS:
1261 case V4L2_CID_FM_TX_CLASS:
1262 case V4L2_CID_FLASH_CLASS:
1263 case V4L2_CID_JPEG_CLASS:
1264 case V4L2_CID_IMAGE_SOURCE_CLASS:
1265 case V4L2_CID_IMAGE_PROC_CLASS:
1266 case V4L2_CID_DV_CLASS:
1267 case V4L2_CID_FM_RX_CLASS:
1268 case V4L2_CID_RF_TUNER_CLASS:
1269 case V4L2_CID_DETECT_CLASS:
1270 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1271 /* You can neither read not write these */
1272 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1273 *min = *max = *step = *def = 0;
1274 break;
1275 case V4L2_CID_BG_COLOR:
1276 *type = V4L2_CTRL_TYPE_INTEGER;
1277 *step = 1;
1278 *min = 0;
1279 /* Max is calculated as RGB888 that is 2^24 */
1280 *max = 0xFFFFFF;
1281 break;
1282 case V4L2_CID_FLASH_FAULT:
1283 case V4L2_CID_JPEG_ACTIVE_MARKER:
1284 case V4L2_CID_3A_LOCK:
1285 case V4L2_CID_AUTO_FOCUS_STATUS:
1286 case V4L2_CID_DV_TX_HOTPLUG:
1287 case V4L2_CID_DV_TX_RXSENSE:
1288 case V4L2_CID_DV_TX_EDID_PRESENT:
1289 case V4L2_CID_DV_RX_POWER_PRESENT:
1290 *type = V4L2_CTRL_TYPE_BITMASK;
1291 break;
1292 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1293 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1294 *type = V4L2_CTRL_TYPE_INTEGER;
1295 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1296 break;
1297 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1298 *type = V4L2_CTRL_TYPE_INTEGER64;
1299 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1300 *min = *def = 0;
1301 *max = 0x1ffffffffLL;
1302 *step = 1;
1303 break;
1304 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1305 *type = V4L2_CTRL_TYPE_INTEGER64;
1306 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1307 *min = *def = 0;
1308 *max = 0x7fffffffffffffffLL;
1309 *step = 1;
1310 break;
1311 case V4L2_CID_PIXEL_RATE:
1312 *type = V4L2_CTRL_TYPE_INTEGER64;
1313 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1314 break;
1315 case V4L2_CID_DETECT_MD_REGION_GRID:
1316 *type = V4L2_CTRL_TYPE_U8;
1317 break;
1318 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1319 *type = V4L2_CTRL_TYPE_U16;
1320 break;
1321 case V4L2_CID_RDS_TX_ALT_FREQS:
1322 *type = V4L2_CTRL_TYPE_U32;
1323 break;
1324 case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:
1325 *type = V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS;
1326 break;
1327 case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:
1328 *type = V4L2_CTRL_TYPE_MPEG2_QUANTIZATION;
1329 break;
1330 case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS:
1331 *type = V4L2_CTRL_TYPE_FWHT_PARAMS;
1332 break;
1333 case V4L2_CID_MPEG_VIDEO_H264_SPS:
1334 *type = V4L2_CTRL_TYPE_H264_SPS;
1335 break;
1336 case V4L2_CID_MPEG_VIDEO_H264_PPS:
1337 *type = V4L2_CTRL_TYPE_H264_PPS;
1338 break;
1339 case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX:
1340 *type = V4L2_CTRL_TYPE_H264_SCALING_MATRIX;
1341 break;
1342 case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS:
1343 *type = V4L2_CTRL_TYPE_H264_SLICE_PARAMS;
1344 break;
1345 case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS:
1346 *type = V4L2_CTRL_TYPE_H264_DECODE_PARAMS;
1347 break;
1348 default:
1349 *type = V4L2_CTRL_TYPE_INTEGER;
1350 break;
1351 }
1352 switch (id) {
1353 case V4L2_CID_MPEG_AUDIO_ENCODING:
1354 case V4L2_CID_MPEG_AUDIO_MODE:
1355 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1356 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1357 case V4L2_CID_MPEG_STREAM_TYPE:
1358 *flags |= V4L2_CTRL_FLAG_UPDATE;
1359 break;
1360 case V4L2_CID_AUDIO_VOLUME:
1361 case V4L2_CID_AUDIO_BALANCE:
1362 case V4L2_CID_AUDIO_BASS:
1363 case V4L2_CID_AUDIO_TREBLE:
1364 case V4L2_CID_BRIGHTNESS:
1365 case V4L2_CID_CONTRAST:
1366 case V4L2_CID_SATURATION:
1367 case V4L2_CID_HUE:
1368 case V4L2_CID_RED_BALANCE:
1369 case V4L2_CID_BLUE_BALANCE:
1370 case V4L2_CID_GAMMA:
1371 case V4L2_CID_SHARPNESS:
1372 case V4L2_CID_CHROMA_GAIN:
1373 case V4L2_CID_RDS_TX_DEVIATION:
1374 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1375 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1376 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1377 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1378 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1379 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1380 case V4L2_CID_PILOT_TONE_DEVIATION:
1381 case V4L2_CID_PILOT_TONE_FREQUENCY:
1382 case V4L2_CID_TUNE_POWER_LEVEL:
1383 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1384 case V4L2_CID_RF_TUNER_RF_GAIN:
1385 case V4L2_CID_RF_TUNER_LNA_GAIN:
1386 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1387 case V4L2_CID_RF_TUNER_IF_GAIN:
1388 case V4L2_CID_RF_TUNER_BANDWIDTH:
1389 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1390 *flags |= V4L2_CTRL_FLAG_SLIDER;
1391 break;
1392 case V4L2_CID_PAN_RELATIVE:
1393 case V4L2_CID_TILT_RELATIVE:
1394 case V4L2_CID_FOCUS_RELATIVE:
1395 case V4L2_CID_IRIS_RELATIVE:
1396 case V4L2_CID_ZOOM_RELATIVE:
1397 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1398 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1399 break;
1400 case V4L2_CID_FLASH_STROBE_STATUS:
1401 case V4L2_CID_AUTO_FOCUS_STATUS:
1402 case V4L2_CID_FLASH_READY:
1403 case V4L2_CID_DV_TX_HOTPLUG:
1404 case V4L2_CID_DV_TX_RXSENSE:
1405 case V4L2_CID_DV_TX_EDID_PRESENT:
1406 case V4L2_CID_DV_RX_POWER_PRESENT:
1407 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1408 case V4L2_CID_RDS_RX_PTY:
1409 case V4L2_CID_RDS_RX_PS_NAME:
1410 case V4L2_CID_RDS_RX_RADIO_TEXT:
1411 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1412 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1413 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1414 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1415 break;
1416 case V4L2_CID_RF_TUNER_PLL_LOCK:
1417 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1418 break;
1419 }
1420 }
1421 EXPORT_SYMBOL(v4l2_ctrl_fill);
1422
1423 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1424 {
1425 u32 flags = ctrl->flags;
1426
1427 if (ctrl->is_ptr)
1428 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1429
1430 return flags;
1431 }
1432
1433 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1434 {
1435 memset(ev, 0, sizeof(*ev));
1436 ev->type = V4L2_EVENT_CTRL;
1437 ev->id = ctrl->id;
1438 ev->u.ctrl.changes = changes;
1439 ev->u.ctrl.type = ctrl->type;
1440 ev->u.ctrl.flags = user_flags(ctrl);
1441 if (ctrl->is_ptr)
1442 ev->u.ctrl.value64 = 0;
1443 else
1444 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1445 ev->u.ctrl.minimum = ctrl->minimum;
1446 ev->u.ctrl.maximum = ctrl->maximum;
1447 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1448 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1449 ev->u.ctrl.step = 1;
1450 else
1451 ev->u.ctrl.step = ctrl->step;
1452 ev->u.ctrl.default_value = ctrl->default_value;
1453 }
1454
1455 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1456 {
1457 struct v4l2_event ev;
1458 struct v4l2_subscribed_event *sev;
1459
1460 if (list_empty(&ctrl->ev_subs))
1461 return;
1462 fill_event(&ev, ctrl, changes);
1463
1464 list_for_each_entry(sev, &ctrl->ev_subs, node)
1465 if (sev->fh != fh ||
1466 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1467 v4l2_event_queue_fh(sev->fh, &ev);
1468 }
1469
1470 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1471 union v4l2_ctrl_ptr ptr1,
1472 union v4l2_ctrl_ptr ptr2)
1473 {
1474 switch (ctrl->type) {
1475 case V4L2_CTRL_TYPE_BUTTON:
1476 return false;
1477 case V4L2_CTRL_TYPE_STRING:
1478 idx *= ctrl->elem_size;
1479 /* strings are always 0-terminated */
1480 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1481 case V4L2_CTRL_TYPE_INTEGER64:
1482 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1483 case V4L2_CTRL_TYPE_U8:
1484 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1485 case V4L2_CTRL_TYPE_U16:
1486 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1487 case V4L2_CTRL_TYPE_U32:
1488 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1489 default:
1490 if (ctrl->is_int)
1491 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1492 idx *= ctrl->elem_size;
1493 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1494 }
1495 }
1496
1497 static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx,
1498 union v4l2_ctrl_ptr ptr)
1499 {
1500 struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1501 void *p = ptr.p + idx * ctrl->elem_size;
1502
1503 memset(p, 0, ctrl->elem_size);
1504
1505 /*
1506 * The cast is needed to get rid of a gcc warning complaining that
1507 * V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS is not part of the
1508 * v4l2_ctrl_type enum.
1509 */
1510 switch ((u32)ctrl->type) {
1511 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1512 p_mpeg2_slice_params = p;
1513 /* 4:2:0 */
1514 p_mpeg2_slice_params->sequence.chroma_format = 1;
1515 /* interlaced top field */
1516 p_mpeg2_slice_params->picture.picture_structure = 1;
1517 p_mpeg2_slice_params->picture.picture_coding_type =
1518 V4L2_MPEG2_PICTURE_CODING_TYPE_I;
1519 break;
1520 }
1521 }
1522
1523 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1524 union v4l2_ctrl_ptr ptr)
1525 {
1526 switch (ctrl->type) {
1527 case V4L2_CTRL_TYPE_STRING:
1528 idx *= ctrl->elem_size;
1529 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1530 ptr.p_char[idx + ctrl->minimum] = '\0';
1531 break;
1532 case V4L2_CTRL_TYPE_INTEGER64:
1533 ptr.p_s64[idx] = ctrl->default_value;
1534 break;
1535 case V4L2_CTRL_TYPE_INTEGER:
1536 case V4L2_CTRL_TYPE_INTEGER_MENU:
1537 case V4L2_CTRL_TYPE_MENU:
1538 case V4L2_CTRL_TYPE_BITMASK:
1539 case V4L2_CTRL_TYPE_BOOLEAN:
1540 ptr.p_s32[idx] = ctrl->default_value;
1541 break;
1542 case V4L2_CTRL_TYPE_BUTTON:
1543 case V4L2_CTRL_TYPE_CTRL_CLASS:
1544 ptr.p_s32[idx] = 0;
1545 break;
1546 case V4L2_CTRL_TYPE_U8:
1547 ptr.p_u8[idx] = ctrl->default_value;
1548 break;
1549 case V4L2_CTRL_TYPE_U16:
1550 ptr.p_u16[idx] = ctrl->default_value;
1551 break;
1552 case V4L2_CTRL_TYPE_U32:
1553 ptr.p_u32[idx] = ctrl->default_value;
1554 break;
1555 default:
1556 std_init_compound(ctrl, idx, ptr);
1557 break;
1558 }
1559 }
1560
1561 static void std_log(const struct v4l2_ctrl *ctrl)
1562 {
1563 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1564
1565 if (ctrl->is_array) {
1566 unsigned i;
1567
1568 for (i = 0; i < ctrl->nr_of_dims; i++)
1569 pr_cont("[%u]", ctrl->dims[i]);
1570 pr_cont(" ");
1571 }
1572
1573 switch (ctrl->type) {
1574 case V4L2_CTRL_TYPE_INTEGER:
1575 pr_cont("%d", *ptr.p_s32);
1576 break;
1577 case V4L2_CTRL_TYPE_BOOLEAN:
1578 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1579 break;
1580 case V4L2_CTRL_TYPE_MENU:
1581 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1582 break;
1583 case V4L2_CTRL_TYPE_INTEGER_MENU:
1584 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1585 break;
1586 case V4L2_CTRL_TYPE_BITMASK:
1587 pr_cont("0x%08x", *ptr.p_s32);
1588 break;
1589 case V4L2_CTRL_TYPE_INTEGER64:
1590 pr_cont("%lld", *ptr.p_s64);
1591 break;
1592 case V4L2_CTRL_TYPE_STRING:
1593 pr_cont("%s", ptr.p_char);
1594 break;
1595 case V4L2_CTRL_TYPE_U8:
1596 pr_cont("%u", (unsigned)*ptr.p_u8);
1597 break;
1598 case V4L2_CTRL_TYPE_U16:
1599 pr_cont("%u", (unsigned)*ptr.p_u16);
1600 break;
1601 case V4L2_CTRL_TYPE_U32:
1602 pr_cont("%u", (unsigned)*ptr.p_u32);
1603 break;
1604 default:
1605 pr_cont("unknown type %d", ctrl->type);
1606 break;
1607 }
1608 }
1609
1610 /*
1611 * Round towards the closest legal value. Be careful when we are
1612 * close to the maximum range of the control type to prevent
1613 * wrap-arounds.
1614 */
1615 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1616 ({ \
1617 offset_type offset; \
1618 if ((ctrl)->maximum >= 0 && \
1619 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1620 val = (ctrl)->maximum; \
1621 else \
1622 val += (s32)((ctrl)->step / 2); \
1623 val = clamp_t(typeof(val), val, \
1624 (ctrl)->minimum, (ctrl)->maximum); \
1625 offset = (val) - (ctrl)->minimum; \
1626 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1627 val = (ctrl)->minimum + offset; \
1628 0; \
1629 })
1630
1631 /* Validate a new control */
1632 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1633 union v4l2_ctrl_ptr ptr)
1634 {
1635 struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1636 size_t len;
1637 u64 offset;
1638 s64 val;
1639
1640 switch ((u32)ctrl->type) {
1641 case V4L2_CTRL_TYPE_INTEGER:
1642 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1643 case V4L2_CTRL_TYPE_INTEGER64:
1644 /*
1645 * We can't use the ROUND_TO_RANGE define here due to
1646 * the u64 divide that needs special care.
1647 */
1648 val = ptr.p_s64[idx];
1649 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1650 val = ctrl->maximum;
1651 else
1652 val += (s64)(ctrl->step / 2);
1653 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1654 offset = val - ctrl->minimum;
1655 do_div(offset, ctrl->step);
1656 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1657 return 0;
1658 case V4L2_CTRL_TYPE_U8:
1659 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1660 case V4L2_CTRL_TYPE_U16:
1661 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1662 case V4L2_CTRL_TYPE_U32:
1663 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1664
1665 case V4L2_CTRL_TYPE_BOOLEAN:
1666 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1667 return 0;
1668
1669 case V4L2_CTRL_TYPE_MENU:
1670 case V4L2_CTRL_TYPE_INTEGER_MENU:
1671 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1672 return -ERANGE;
1673 if (ctrl->menu_skip_mask & (1ULL << ptr.p_s32[idx]))
1674 return -EINVAL;
1675 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1676 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1677 return -EINVAL;
1678 return 0;
1679
1680 case V4L2_CTRL_TYPE_BITMASK:
1681 ptr.p_s32[idx] &= ctrl->maximum;
1682 return 0;
1683
1684 case V4L2_CTRL_TYPE_BUTTON:
1685 case V4L2_CTRL_TYPE_CTRL_CLASS:
1686 ptr.p_s32[idx] = 0;
1687 return 0;
1688
1689 case V4L2_CTRL_TYPE_STRING:
1690 idx *= ctrl->elem_size;
1691 len = strlen(ptr.p_char + idx);
1692 if (len < ctrl->minimum)
1693 return -ERANGE;
1694 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1695 return -ERANGE;
1696 return 0;
1697
1698 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1699 p_mpeg2_slice_params = ptr.p;
1700
1701 switch (p_mpeg2_slice_params->sequence.chroma_format) {
1702 case 1: /* 4:2:0 */
1703 case 2: /* 4:2:2 */
1704 case 3: /* 4:4:4 */
1705 break;
1706 default:
1707 return -EINVAL;
1708 }
1709
1710 switch (p_mpeg2_slice_params->picture.intra_dc_precision) {
1711 case 0: /* 8 bits */
1712 case 1: /* 9 bits */
1713 case 2: /* 10 bits */
1714 case 3: /* 11 bits */
1715 break;
1716 default:
1717 return -EINVAL;
1718 }
1719
1720 switch (p_mpeg2_slice_params->picture.picture_structure) {
1721 case 1: /* interlaced top field */
1722 case 2: /* interlaced bottom field */
1723 case 3: /* progressive */
1724 break;
1725 default:
1726 return -EINVAL;
1727 }
1728
1729 switch (p_mpeg2_slice_params->picture.picture_coding_type) {
1730 case V4L2_MPEG2_PICTURE_CODING_TYPE_I:
1731 case V4L2_MPEG2_PICTURE_CODING_TYPE_P:
1732 case V4L2_MPEG2_PICTURE_CODING_TYPE_B:
1733 break;
1734 default:
1735 return -EINVAL;
1736 }
1737
1738 return 0;
1739
1740 case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
1741 return 0;
1742
1743 case V4L2_CTRL_TYPE_FWHT_PARAMS:
1744 return 0;
1745
1746 case V4L2_CTRL_TYPE_H264_SPS:
1747 case V4L2_CTRL_TYPE_H264_PPS:
1748 case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
1749 case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
1750 case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
1751 return 0;
1752
1753 default:
1754 return -EINVAL;
1755 }
1756 }
1757
1758 static const struct v4l2_ctrl_type_ops std_type_ops = {
1759 .equal = std_equal,
1760 .init = std_init,
1761 .log = std_log,
1762 .validate = std_validate,
1763 };
1764
1765 /* Helper function: copy the given control value back to the caller */
1766 static int ptr_to_user(struct v4l2_ext_control *c,
1767 struct v4l2_ctrl *ctrl,
1768 union v4l2_ctrl_ptr ptr)
1769 {
1770 u32 len;
1771
1772 if (ctrl->is_ptr && !ctrl->is_string)
1773 return copy_to_user(c->ptr, ptr.p, c->size) ?
1774 -EFAULT : 0;
1775
1776 switch (ctrl->type) {
1777 case V4L2_CTRL_TYPE_STRING:
1778 len = strlen(ptr.p_char);
1779 if (c->size < len + 1) {
1780 c->size = ctrl->elem_size;
1781 return -ENOSPC;
1782 }
1783 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1784 -EFAULT : 0;
1785 case V4L2_CTRL_TYPE_INTEGER64:
1786 c->value64 = *ptr.p_s64;
1787 break;
1788 default:
1789 c->value = *ptr.p_s32;
1790 break;
1791 }
1792 return 0;
1793 }
1794
1795 /* Helper function: copy the current control value back to the caller */
1796 static int cur_to_user(struct v4l2_ext_control *c,
1797 struct v4l2_ctrl *ctrl)
1798 {
1799 return ptr_to_user(c, ctrl, ctrl->p_cur);
1800 }
1801
1802 /* Helper function: copy the new control value back to the caller */
1803 static int new_to_user(struct v4l2_ext_control *c,
1804 struct v4l2_ctrl *ctrl)
1805 {
1806 return ptr_to_user(c, ctrl, ctrl->p_new);
1807 }
1808
1809 /* Helper function: copy the request value back to the caller */
1810 static int req_to_user(struct v4l2_ext_control *c,
1811 struct v4l2_ctrl_ref *ref)
1812 {
1813 return ptr_to_user(c, ref->ctrl, ref->p_req);
1814 }
1815
1816 /* Helper function: copy the initial control value back to the caller */
1817 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1818 {
1819 int idx;
1820
1821 for (idx = 0; idx < ctrl->elems; idx++)
1822 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1823
1824 return ptr_to_user(c, ctrl, ctrl->p_new);
1825 }
1826
1827 /* Helper function: copy the caller-provider value to the given control value */
1828 static int user_to_ptr(struct v4l2_ext_control *c,
1829 struct v4l2_ctrl *ctrl,
1830 union v4l2_ctrl_ptr ptr)
1831 {
1832 int ret;
1833 u32 size;
1834
1835 ctrl->is_new = 1;
1836 if (ctrl->is_ptr && !ctrl->is_string) {
1837 unsigned idx;
1838
1839 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1840 if (ret || !ctrl->is_array)
1841 return ret;
1842 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1843 ctrl->type_ops->init(ctrl, idx, ptr);
1844 return 0;
1845 }
1846
1847 switch (ctrl->type) {
1848 case V4L2_CTRL_TYPE_INTEGER64:
1849 *ptr.p_s64 = c->value64;
1850 break;
1851 case V4L2_CTRL_TYPE_STRING:
1852 size = c->size;
1853 if (size == 0)
1854 return -ERANGE;
1855 if (size > ctrl->maximum + 1)
1856 size = ctrl->maximum + 1;
1857 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1858 if (!ret) {
1859 char last = ptr.p_char[size - 1];
1860
1861 ptr.p_char[size - 1] = 0;
1862 /* If the string was longer than ctrl->maximum,
1863 then return an error. */
1864 if (strlen(ptr.p_char) == ctrl->maximum && last)
1865 return -ERANGE;
1866 }
1867 return ret;
1868 default:
1869 *ptr.p_s32 = c->value;
1870 break;
1871 }
1872 return 0;
1873 }
1874
1875 /* Helper function: copy the caller-provider value as the new control value */
1876 static int user_to_new(struct v4l2_ext_control *c,
1877 struct v4l2_ctrl *ctrl)
1878 {
1879 return user_to_ptr(c, ctrl, ctrl->p_new);
1880 }
1881
1882 /* Copy the one value to another. */
1883 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1884 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1885 {
1886 if (ctrl == NULL)
1887 return;
1888 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1889 }
1890
1891 /* Copy the new value to the current value. */
1892 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1893 {
1894 bool changed;
1895
1896 if (ctrl == NULL)
1897 return;
1898
1899 /* has_changed is set by cluster_changed */
1900 changed = ctrl->has_changed;
1901 if (changed)
1902 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1903
1904 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1905 /* Note: CH_FLAGS is only set for auto clusters. */
1906 ctrl->flags &=
1907 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1908 if (!is_cur_manual(ctrl->cluster[0])) {
1909 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1910 if (ctrl->cluster[0]->has_volatiles)
1911 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1912 }
1913 fh = NULL;
1914 }
1915 if (changed || ch_flags) {
1916 /* If a control was changed that was not one of the controls
1917 modified by the application, then send the event to all. */
1918 if (!ctrl->is_new)
1919 fh = NULL;
1920 send_event(fh, ctrl,
1921 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1922 if (ctrl->call_notify && changed && ctrl->handler->notify)
1923 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1924 }
1925 }
1926
1927 /* Copy the current value to the new value */
1928 static void cur_to_new(struct v4l2_ctrl *ctrl)
1929 {
1930 if (ctrl == NULL)
1931 return;
1932 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1933 }
1934
1935 /* Copy the new value to the request value */
1936 static void new_to_req(struct v4l2_ctrl_ref *ref)
1937 {
1938 if (!ref)
1939 return;
1940 ptr_to_ptr(ref->ctrl, ref->ctrl->p_new, ref->p_req);
1941 ref->req = ref;
1942 }
1943
1944 /* Copy the request value to the new value */
1945 static void req_to_new(struct v4l2_ctrl_ref *ref)
1946 {
1947 if (!ref)
1948 return;
1949 if (ref->req)
1950 ptr_to_ptr(ref->ctrl, ref->req->p_req, ref->ctrl->p_new);
1951 else
1952 ptr_to_ptr(ref->ctrl, ref->ctrl->p_cur, ref->ctrl->p_new);
1953 }
1954
1955 /* Return non-zero if one or more of the controls in the cluster has a new
1956 value that differs from the current value. */
1957 static int cluster_changed(struct v4l2_ctrl *master)
1958 {
1959 bool changed = false;
1960 unsigned idx;
1961 int i;
1962
1963 for (i = 0; i < master->ncontrols; i++) {
1964 struct v4l2_ctrl *ctrl = master->cluster[i];
1965 bool ctrl_changed = false;
1966
1967 if (ctrl == NULL)
1968 continue;
1969
1970 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1971 changed = ctrl_changed = true;
1972
1973 /*
1974 * Set has_changed to false to avoid generating
1975 * the event V4L2_EVENT_CTRL_CH_VALUE
1976 */
1977 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1978 ctrl->has_changed = false;
1979 continue;
1980 }
1981
1982 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1983 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1984 ctrl->p_cur, ctrl->p_new);
1985 ctrl->has_changed = ctrl_changed;
1986 changed |= ctrl->has_changed;
1987 }
1988 return changed;
1989 }
1990
1991 /* Control range checking */
1992 static int check_range(enum v4l2_ctrl_type type,
1993 s64 min, s64 max, u64 step, s64 def)
1994 {
1995 switch (type) {
1996 case V4L2_CTRL_TYPE_BOOLEAN:
1997 if (step != 1 || max > 1 || min < 0)
1998 return -ERANGE;
1999 /* fall through */
2000 case V4L2_CTRL_TYPE_U8:
2001 case V4L2_CTRL_TYPE_U16:
2002 case V4L2_CTRL_TYPE_U32:
2003 case V4L2_CTRL_TYPE_INTEGER:
2004 case V4L2_CTRL_TYPE_INTEGER64:
2005 if (step == 0 || min > max || def < min || def > max)
2006 return -ERANGE;
2007 return 0;
2008 case V4L2_CTRL_TYPE_BITMASK:
2009 if (step || min || !max || (def & ~max))
2010 return -ERANGE;
2011 return 0;
2012 case V4L2_CTRL_TYPE_MENU:
2013 case V4L2_CTRL_TYPE_INTEGER_MENU:
2014 if (min > max || def < min || def > max)
2015 return -ERANGE;
2016 /* Note: step == menu_skip_mask for menu controls.
2017 So here we check if the default value is masked out. */
2018 if (step && ((1 << def) & step))
2019 return -EINVAL;
2020 return 0;
2021 case V4L2_CTRL_TYPE_STRING:
2022 if (min > max || min < 0 || step < 1 || def)
2023 return -ERANGE;
2024 return 0;
2025 default:
2026 return 0;
2027 }
2028 }
2029
2030 /* Validate a new control */
2031 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
2032 {
2033 unsigned idx;
2034 int err = 0;
2035
2036 for (idx = 0; !err && idx < ctrl->elems; idx++)
2037 err = ctrl->type_ops->validate(ctrl, idx, p_new);
2038 return err;
2039 }
2040
2041 static inline u32 node2id(struct list_head *node)
2042 {
2043 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
2044 }
2045
2046 /* Set the handler's error code if it wasn't set earlier already */
2047 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
2048 {
2049 if (hdl->error == 0)
2050 hdl->error = err;
2051 return err;
2052 }
2053
2054 /* Initialize the handler */
2055 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
2056 unsigned nr_of_controls_hint,
2057 struct lock_class_key *key, const char *name)
2058 {
2059 mutex_init(&hdl->_lock);
2060 hdl->lock = &hdl->_lock;
2061 lockdep_set_class_and_name(hdl->lock, key, name);
2062 INIT_LIST_HEAD(&hdl->ctrls);
2063 INIT_LIST_HEAD(&hdl->ctrl_refs);
2064 INIT_LIST_HEAD(&hdl->requests);
2065 INIT_LIST_HEAD(&hdl->requests_queued);
2066 hdl->request_is_queued = false;
2067 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
2068 hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
2069 sizeof(hdl->buckets[0]),
2070 GFP_KERNEL | __GFP_ZERO);
2071 hdl->error = hdl->buckets ? 0 : -ENOMEM;
2072 media_request_object_init(&hdl->req_obj);
2073 return hdl->error;
2074 }
2075 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
2076
2077 /* Free all controls and control refs */
2078 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
2079 {
2080 struct v4l2_ctrl_ref *ref, *next_ref;
2081 struct v4l2_ctrl *ctrl, *next_ctrl;
2082 struct v4l2_subscribed_event *sev, *next_sev;
2083
2084 if (hdl == NULL || hdl->buckets == NULL)
2085 return;
2086
2087 if (!hdl->req_obj.req && !list_empty(&hdl->requests)) {
2088 struct v4l2_ctrl_handler *req, *next_req;
2089
2090 list_for_each_entry_safe(req, next_req, &hdl->requests, requests) {
2091 media_request_object_unbind(&req->req_obj);
2092 media_request_object_put(&req->req_obj);
2093 }
2094 }
2095 mutex_lock(hdl->lock);
2096 /* Free all nodes */
2097 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
2098 list_del(&ref->node);
2099 kfree(ref);
2100 }
2101 /* Free all controls owned by the handler */
2102 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
2103 list_del(&ctrl->node);
2104 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
2105 list_del(&sev->node);
2106 kvfree(ctrl);
2107 }
2108 kvfree(hdl->buckets);
2109 hdl->buckets = NULL;
2110 hdl->cached = NULL;
2111 hdl->error = 0;
2112 mutex_unlock(hdl->lock);
2113 mutex_destroy(&hdl->_lock);
2114 }
2115 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
2116
2117 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
2118 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
2119 with applications that do not use the NEXT_CTRL flag.
2120
2121 We just find the n-th private user control. It's O(N), but that should not
2122 be an issue in this particular case. */
2123 static struct v4l2_ctrl_ref *find_private_ref(
2124 struct v4l2_ctrl_handler *hdl, u32 id)
2125 {
2126 struct v4l2_ctrl_ref *ref;
2127
2128 id -= V4L2_CID_PRIVATE_BASE;
2129 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2130 /* Search for private user controls that are compatible with
2131 VIDIOC_G/S_CTRL. */
2132 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
2133 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
2134 if (!ref->ctrl->is_int)
2135 continue;
2136 if (id == 0)
2137 return ref;
2138 id--;
2139 }
2140 }
2141 return NULL;
2142 }
2143
2144 /* Find a control with the given ID. */
2145 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
2146 {
2147 struct v4l2_ctrl_ref *ref;
2148 int bucket;
2149
2150 id &= V4L2_CTRL_ID_MASK;
2151
2152 /* Old-style private controls need special handling */
2153 if (id >= V4L2_CID_PRIVATE_BASE)
2154 return find_private_ref(hdl, id);
2155 bucket = id % hdl->nr_of_buckets;
2156
2157 /* Simple optimization: cache the last control found */
2158 if (hdl->cached && hdl->cached->ctrl->id == id)
2159 return hdl->cached;
2160
2161 /* Not in cache, search the hash */
2162 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
2163 while (ref && ref->ctrl->id != id)
2164 ref = ref->next;
2165
2166 if (ref)
2167 hdl->cached = ref; /* cache it! */
2168 return ref;
2169 }
2170
2171 /* Find a control with the given ID. Take the handler's lock first. */
2172 static struct v4l2_ctrl_ref *find_ref_lock(
2173 struct v4l2_ctrl_handler *hdl, u32 id)
2174 {
2175 struct v4l2_ctrl_ref *ref = NULL;
2176
2177 if (hdl) {
2178 mutex_lock(hdl->lock);
2179 ref = find_ref(hdl, id);
2180 mutex_unlock(hdl->lock);
2181 }
2182 return ref;
2183 }
2184
2185 /* Find a control with the given ID. */
2186 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
2187 {
2188 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
2189
2190 return ref ? ref->ctrl : NULL;
2191 }
2192 EXPORT_SYMBOL(v4l2_ctrl_find);
2193
2194 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
2195 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
2196 struct v4l2_ctrl *ctrl,
2197 struct v4l2_ctrl_ref **ctrl_ref,
2198 bool from_other_dev, bool allocate_req)
2199 {
2200 struct v4l2_ctrl_ref *ref;
2201 struct v4l2_ctrl_ref *new_ref;
2202 u32 id = ctrl->id;
2203 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
2204 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
2205 unsigned int size_extra_req = 0;
2206
2207 if (ctrl_ref)
2208 *ctrl_ref = NULL;
2209
2210 /*
2211 * Automatically add the control class if it is not yet present and
2212 * the new control is not a compound control.
2213 */
2214 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
2215 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
2216 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
2217 return hdl->error;
2218
2219 if (hdl->error)
2220 return hdl->error;
2221
2222 if (allocate_req)
2223 size_extra_req = ctrl->elems * ctrl->elem_size;
2224 new_ref = kzalloc(sizeof(*new_ref) + size_extra_req, GFP_KERNEL);
2225 if (!new_ref)
2226 return handler_set_err(hdl, -ENOMEM);
2227 new_ref->ctrl = ctrl;
2228 new_ref->from_other_dev = from_other_dev;
2229 if (size_extra_req)
2230 new_ref->p_req.p = &new_ref[1];
2231
2232 INIT_LIST_HEAD(&new_ref->node);
2233
2234 mutex_lock(hdl->lock);
2235
2236 /* Add immediately at the end of the list if the list is empty, or if
2237 the last element in the list has a lower ID.
2238 This ensures that when elements are added in ascending order the
2239 insertion is an O(1) operation. */
2240 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
2241 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
2242 goto insert_in_hash;
2243 }
2244
2245 /* Find insert position in sorted list */
2246 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2247 if (ref->ctrl->id < id)
2248 continue;
2249 /* Don't add duplicates */
2250 if (ref->ctrl->id == id) {
2251 kfree(new_ref);
2252 goto unlock;
2253 }
2254 list_add(&new_ref->node, ref->node.prev);
2255 break;
2256 }
2257
2258 insert_in_hash:
2259 /* Insert the control node in the hash */
2260 new_ref->next = hdl->buckets[bucket];
2261 hdl->buckets[bucket] = new_ref;
2262 if (ctrl_ref)
2263 *ctrl_ref = new_ref;
2264 if (ctrl->handler == hdl) {
2265 /* By default each control starts in a cluster of its own.
2266 * new_ref->ctrl is basically a cluster array with one
2267 * element, so that's perfect to use as the cluster pointer.
2268 * But only do this for the handler that owns the control.
2269 */
2270 ctrl->cluster = &new_ref->ctrl;
2271 ctrl->ncontrols = 1;
2272 }
2273
2274 unlock:
2275 mutex_unlock(hdl->lock);
2276 return 0;
2277 }
2278
2279 /* Add a new control */
2280 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
2281 const struct v4l2_ctrl_ops *ops,
2282 const struct v4l2_ctrl_type_ops *type_ops,
2283 u32 id, const char *name, enum v4l2_ctrl_type type,
2284 s64 min, s64 max, u64 step, s64 def,
2285 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
2286 u32 flags, const char * const *qmenu,
2287 const s64 *qmenu_int, void *priv)
2288 {
2289 struct v4l2_ctrl *ctrl;
2290 unsigned sz_extra;
2291 unsigned nr_of_dims = 0;
2292 unsigned elems = 1;
2293 bool is_array;
2294 unsigned tot_ctrl_size;
2295 unsigned idx;
2296 void *data;
2297 int err;
2298
2299 if (hdl->error)
2300 return NULL;
2301
2302 while (dims && dims[nr_of_dims]) {
2303 elems *= dims[nr_of_dims];
2304 nr_of_dims++;
2305 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
2306 break;
2307 }
2308 is_array = nr_of_dims > 0;
2309
2310 /* Prefill elem_size for all types handled by std_type_ops */
2311 switch ((u32)type) {
2312 case V4L2_CTRL_TYPE_INTEGER64:
2313 elem_size = sizeof(s64);
2314 break;
2315 case V4L2_CTRL_TYPE_STRING:
2316 elem_size = max + 1;
2317 break;
2318 case V4L2_CTRL_TYPE_U8:
2319 elem_size = sizeof(u8);
2320 break;
2321 case V4L2_CTRL_TYPE_U16:
2322 elem_size = sizeof(u16);
2323 break;
2324 case V4L2_CTRL_TYPE_U32:
2325 elem_size = sizeof(u32);
2326 break;
2327 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
2328 elem_size = sizeof(struct v4l2_ctrl_mpeg2_slice_params);
2329 break;
2330 case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
2331 elem_size = sizeof(struct v4l2_ctrl_mpeg2_quantization);
2332 break;
2333 case V4L2_CTRL_TYPE_FWHT_PARAMS:
2334 elem_size = sizeof(struct v4l2_ctrl_fwht_params);
2335 break;
2336 case V4L2_CTRL_TYPE_H264_SPS:
2337 elem_size = sizeof(struct v4l2_ctrl_h264_sps);
2338 break;
2339 case V4L2_CTRL_TYPE_H264_PPS:
2340 elem_size = sizeof(struct v4l2_ctrl_h264_pps);
2341 break;
2342 case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
2343 elem_size = sizeof(struct v4l2_ctrl_h264_scaling_matrix);
2344 break;
2345 case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
2346 elem_size = sizeof(struct v4l2_ctrl_h264_slice_params);
2347 break;
2348 case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
2349 elem_size = sizeof(struct v4l2_ctrl_h264_decode_params);
2350 break;
2351 default:
2352 if (type < V4L2_CTRL_COMPOUND_TYPES)
2353 elem_size = sizeof(s32);
2354 break;
2355 }
2356 tot_ctrl_size = elem_size * elems;
2357
2358 /* Sanity checks */
2359 if (id == 0 || name == NULL || !elem_size ||
2360 id >= V4L2_CID_PRIVATE_BASE ||
2361 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2362 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2363 handler_set_err(hdl, -ERANGE);
2364 return NULL;
2365 }
2366 err = check_range(type, min, max, step, def);
2367 if (err) {
2368 handler_set_err(hdl, err);
2369 return NULL;
2370 }
2371 if (is_array &&
2372 (type == V4L2_CTRL_TYPE_BUTTON ||
2373 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2374 handler_set_err(hdl, -EINVAL);
2375 return NULL;
2376 }
2377
2378 sz_extra = 0;
2379 if (type == V4L2_CTRL_TYPE_BUTTON)
2380 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2381 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2382 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2383 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2384 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2385 type == V4L2_CTRL_TYPE_STRING ||
2386 type >= V4L2_CTRL_COMPOUND_TYPES ||
2387 is_array)
2388 sz_extra += 2 * tot_ctrl_size;
2389
2390 ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2391 if (ctrl == NULL) {
2392 handler_set_err(hdl, -ENOMEM);
2393 return NULL;
2394 }
2395
2396 INIT_LIST_HEAD(&ctrl->node);
2397 INIT_LIST_HEAD(&ctrl->ev_subs);
2398 ctrl->handler = hdl;
2399 ctrl->ops = ops;
2400 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2401 ctrl->id = id;
2402 ctrl->name = name;
2403 ctrl->type = type;
2404 ctrl->flags = flags;
2405 ctrl->minimum = min;
2406 ctrl->maximum = max;
2407 ctrl->step = step;
2408 ctrl->default_value = def;
2409 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2410 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2411 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2412 ctrl->is_array = is_array;
2413 ctrl->elems = elems;
2414 ctrl->nr_of_dims = nr_of_dims;
2415 if (nr_of_dims)
2416 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2417 ctrl->elem_size = elem_size;
2418 if (type == V4L2_CTRL_TYPE_MENU)
2419 ctrl->qmenu = qmenu;
2420 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2421 ctrl->qmenu_int = qmenu_int;
2422 ctrl->priv = priv;
2423 ctrl->cur.val = ctrl->val = def;
2424 data = &ctrl[1];
2425
2426 if (!ctrl->is_int) {
2427 ctrl->p_new.p = data;
2428 ctrl->p_cur.p = data + tot_ctrl_size;
2429 } else {
2430 ctrl->p_new.p = &ctrl->val;
2431 ctrl->p_cur.p = &ctrl->cur.val;
2432 }
2433 for (idx = 0; idx < elems; idx++) {
2434 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2435 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2436 }
2437
2438 if (handler_new_ref(hdl, ctrl, NULL, false, false)) {
2439 kvfree(ctrl);
2440 return NULL;
2441 }
2442 mutex_lock(hdl->lock);
2443 list_add_tail(&ctrl->node, &hdl->ctrls);
2444 mutex_unlock(hdl->lock);
2445 return ctrl;
2446 }
2447
2448 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2449 const struct v4l2_ctrl_config *cfg, void *priv)
2450 {
2451 bool is_menu;
2452 struct v4l2_ctrl *ctrl;
2453 const char *name = cfg->name;
2454 const char * const *qmenu = cfg->qmenu;
2455 const s64 *qmenu_int = cfg->qmenu_int;
2456 enum v4l2_ctrl_type type = cfg->type;
2457 u32 flags = cfg->flags;
2458 s64 min = cfg->min;
2459 s64 max = cfg->max;
2460 u64 step = cfg->step;
2461 s64 def = cfg->def;
2462
2463 if (name == NULL)
2464 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2465 &def, &flags);
2466
2467 is_menu = (type == V4L2_CTRL_TYPE_MENU ||
2468 type == V4L2_CTRL_TYPE_INTEGER_MENU);
2469 if (is_menu)
2470 WARN_ON(step);
2471 else
2472 WARN_ON(cfg->menu_skip_mask);
2473 if (type == V4L2_CTRL_TYPE_MENU && !qmenu) {
2474 qmenu = v4l2_ctrl_get_menu(cfg->id);
2475 } else if (type == V4L2_CTRL_TYPE_INTEGER_MENU && !qmenu_int) {
2476 handler_set_err(hdl, -EINVAL);
2477 return NULL;
2478 }
2479
2480 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2481 type, min, max,
2482 is_menu ? cfg->menu_skip_mask : step, def,
2483 cfg->dims, cfg->elem_size,
2484 flags, qmenu, qmenu_int, priv);
2485 if (ctrl)
2486 ctrl->is_private = cfg->is_private;
2487 return ctrl;
2488 }
2489 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2490
2491 /* Helper function for standard non-menu controls */
2492 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2493 const struct v4l2_ctrl_ops *ops,
2494 u32 id, s64 min, s64 max, u64 step, s64 def)
2495 {
2496 const char *name;
2497 enum v4l2_ctrl_type type;
2498 u32 flags;
2499
2500 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2501 if (type == V4L2_CTRL_TYPE_MENU ||
2502 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2503 type >= V4L2_CTRL_COMPOUND_TYPES) {
2504 handler_set_err(hdl, -EINVAL);
2505 return NULL;
2506 }
2507 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2508 min, max, step, def, NULL, 0,
2509 flags, NULL, NULL, NULL);
2510 }
2511 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2512
2513 /* Helper function for standard menu controls */
2514 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2515 const struct v4l2_ctrl_ops *ops,
2516 u32 id, u8 _max, u64 mask, u8 _def)
2517 {
2518 const char * const *qmenu = NULL;
2519 const s64 *qmenu_int = NULL;
2520 unsigned int qmenu_int_len = 0;
2521 const char *name;
2522 enum v4l2_ctrl_type type;
2523 s64 min;
2524 s64 max = _max;
2525 s64 def = _def;
2526 u64 step;
2527 u32 flags;
2528
2529 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2530
2531 if (type == V4L2_CTRL_TYPE_MENU)
2532 qmenu = v4l2_ctrl_get_menu(id);
2533 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2534 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2535
2536 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2537 handler_set_err(hdl, -EINVAL);
2538 return NULL;
2539 }
2540 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2541 0, max, mask, def, NULL, 0,
2542 flags, qmenu, qmenu_int, NULL);
2543 }
2544 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2545
2546 /* Helper function for standard menu controls with driver defined menu */
2547 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2548 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2549 u64 mask, u8 _def, const char * const *qmenu)
2550 {
2551 enum v4l2_ctrl_type type;
2552 const char *name;
2553 u32 flags;
2554 u64 step;
2555 s64 min;
2556 s64 max = _max;
2557 s64 def = _def;
2558
2559 /* v4l2_ctrl_new_std_menu_items() should only be called for
2560 * standard controls without a standard menu.
2561 */
2562 if (v4l2_ctrl_get_menu(id)) {
2563 handler_set_err(hdl, -EINVAL);
2564 return NULL;
2565 }
2566
2567 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2568 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2569 handler_set_err(hdl, -EINVAL);
2570 return NULL;
2571 }
2572 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2573 0, max, mask, def, NULL, 0,
2574 flags, qmenu, NULL, NULL);
2575
2576 }
2577 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2578
2579 /* Helper function for standard integer menu controls */
2580 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2581 const struct v4l2_ctrl_ops *ops,
2582 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2583 {
2584 const char *name;
2585 enum v4l2_ctrl_type type;
2586 s64 min;
2587 u64 step;
2588 s64 max = _max;
2589 s64 def = _def;
2590 u32 flags;
2591
2592 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2593 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2594 handler_set_err(hdl, -EINVAL);
2595 return NULL;
2596 }
2597 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2598 0, max, 0, def, NULL, 0,
2599 flags, NULL, qmenu_int, NULL);
2600 }
2601 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2602
2603 /* Add the controls from another handler to our own. */
2604 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2605 struct v4l2_ctrl_handler *add,
2606 bool (*filter)(const struct v4l2_ctrl *ctrl),
2607 bool from_other_dev)
2608 {
2609 struct v4l2_ctrl_ref *ref;
2610 int ret = 0;
2611
2612 /* Do nothing if either handler is NULL or if they are the same */
2613 if (!hdl || !add || hdl == add)
2614 return 0;
2615 if (hdl->error)
2616 return hdl->error;
2617 mutex_lock(add->lock);
2618 list_for_each_entry(ref, &add->ctrl_refs, node) {
2619 struct v4l2_ctrl *ctrl = ref->ctrl;
2620
2621 /* Skip handler-private controls. */
2622 if (ctrl->is_private)
2623 continue;
2624 /* And control classes */
2625 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2626 continue;
2627 /* Filter any unwanted controls */
2628 if (filter && !filter(ctrl))
2629 continue;
2630 ret = handler_new_ref(hdl, ctrl, NULL, from_other_dev, false);
2631 if (ret)
2632 break;
2633 }
2634 mutex_unlock(add->lock);
2635 return ret;
2636 }
2637 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2638
2639 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2640 {
2641 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2642 return true;
2643 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2644 return true;
2645 switch (ctrl->id) {
2646 case V4L2_CID_AUDIO_MUTE:
2647 case V4L2_CID_AUDIO_VOLUME:
2648 case V4L2_CID_AUDIO_BALANCE:
2649 case V4L2_CID_AUDIO_BASS:
2650 case V4L2_CID_AUDIO_TREBLE:
2651 case V4L2_CID_AUDIO_LOUDNESS:
2652 return true;
2653 default:
2654 break;
2655 }
2656 return false;
2657 }
2658 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2659
2660 /* Cluster controls */
2661 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2662 {
2663 bool has_volatiles = false;
2664 int i;
2665
2666 /* The first control is the master control and it must not be NULL */
2667 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2668 return;
2669
2670 for (i = 0; i < ncontrols; i++) {
2671 if (controls[i]) {
2672 controls[i]->cluster = controls;
2673 controls[i]->ncontrols = ncontrols;
2674 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2675 has_volatiles = true;
2676 }
2677 }
2678 controls[0]->has_volatiles = has_volatiles;
2679 }
2680 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2681
2682 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2683 u8 manual_val, bool set_volatile)
2684 {
2685 struct v4l2_ctrl *master = controls[0];
2686 u32 flag = 0;
2687 int i;
2688
2689 v4l2_ctrl_cluster(ncontrols, controls);
2690 WARN_ON(ncontrols <= 1);
2691 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2692 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2693 master->is_auto = true;
2694 master->has_volatiles = set_volatile;
2695 master->manual_mode_value = manual_val;
2696 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2697
2698 if (!is_cur_manual(master))
2699 flag = V4L2_CTRL_FLAG_INACTIVE |
2700 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2701
2702 for (i = 1; i < ncontrols; i++)
2703 if (controls[i])
2704 controls[i]->flags |= flag;
2705 }
2706 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2707
2708 /* Activate/deactivate a control. */
2709 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2710 {
2711 /* invert since the actual flag is called 'inactive' */
2712 bool inactive = !active;
2713 bool old;
2714
2715 if (ctrl == NULL)
2716 return;
2717
2718 if (inactive)
2719 /* set V4L2_CTRL_FLAG_INACTIVE */
2720 old = test_and_set_bit(4, &ctrl->flags);
2721 else
2722 /* clear V4L2_CTRL_FLAG_INACTIVE */
2723 old = test_and_clear_bit(4, &ctrl->flags);
2724 if (old != inactive)
2725 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2726 }
2727 EXPORT_SYMBOL(v4l2_ctrl_activate);
2728
2729 void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2730 {
2731 bool old;
2732
2733 if (ctrl == NULL)
2734 return;
2735
2736 lockdep_assert_held(ctrl->handler->lock);
2737
2738 if (grabbed)
2739 /* set V4L2_CTRL_FLAG_GRABBED */
2740 old = test_and_set_bit(1, &ctrl->flags);
2741 else
2742 /* clear V4L2_CTRL_FLAG_GRABBED */
2743 old = test_and_clear_bit(1, &ctrl->flags);
2744 if (old != grabbed)
2745 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2746 }
2747 EXPORT_SYMBOL(__v4l2_ctrl_grab);
2748
2749 /* Log the control name and value */
2750 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2751 const char *prefix, const char *colon)
2752 {
2753 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2754 return;
2755 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2756 return;
2757
2758 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2759
2760 ctrl->type_ops->log(ctrl);
2761
2762 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2763 V4L2_CTRL_FLAG_GRABBED |
2764 V4L2_CTRL_FLAG_VOLATILE)) {
2765 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2766 pr_cont(" inactive");
2767 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2768 pr_cont(" grabbed");
2769 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2770 pr_cont(" volatile");
2771 }
2772 pr_cont("\n");
2773 }
2774
2775 /* Log all controls owned by the handler */
2776 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2777 const char *prefix)
2778 {
2779 struct v4l2_ctrl *ctrl;
2780 const char *colon = "";
2781 int len;
2782
2783 if (hdl == NULL)
2784 return;
2785 if (prefix == NULL)
2786 prefix = "";
2787 len = strlen(prefix);
2788 if (len && prefix[len - 1] != ' ')
2789 colon = ": ";
2790 mutex_lock(hdl->lock);
2791 list_for_each_entry(ctrl, &hdl->ctrls, node)
2792 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2793 log_ctrl(ctrl, prefix, colon);
2794 mutex_unlock(hdl->lock);
2795 }
2796 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2797
2798 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2799 {
2800 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2801 return 0;
2802 }
2803 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2804
2805 /* Call s_ctrl for all controls owned by the handler */
2806 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2807 {
2808 struct v4l2_ctrl *ctrl;
2809 int ret = 0;
2810
2811 if (hdl == NULL)
2812 return 0;
2813
2814 lockdep_assert_held(hdl->lock);
2815
2816 list_for_each_entry(ctrl, &hdl->ctrls, node)
2817 ctrl->done = false;
2818
2819 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2820 struct v4l2_ctrl *master = ctrl->cluster[0];
2821 int i;
2822
2823 /* Skip if this control was already handled by a cluster. */
2824 /* Skip button controls and read-only controls. */
2825 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2826 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2827 continue;
2828
2829 for (i = 0; i < master->ncontrols; i++) {
2830 if (master->cluster[i]) {
2831 cur_to_new(master->cluster[i]);
2832 master->cluster[i]->is_new = 1;
2833 master->cluster[i]->done = true;
2834 }
2835 }
2836 ret = call_op(master, s_ctrl);
2837 if (ret)
2838 break;
2839 }
2840
2841 return ret;
2842 }
2843 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
2844
2845 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2846 {
2847 int ret;
2848
2849 if (hdl == NULL)
2850 return 0;
2851
2852 mutex_lock(hdl->lock);
2853 ret = __v4l2_ctrl_handler_setup(hdl);
2854 mutex_unlock(hdl->lock);
2855
2856 return ret;
2857 }
2858 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2859
2860 /* Implement VIDIOC_QUERY_EXT_CTRL */
2861 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2862 {
2863 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2864 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2865 struct v4l2_ctrl_ref *ref;
2866 struct v4l2_ctrl *ctrl;
2867
2868 if (hdl == NULL)
2869 return -EINVAL;
2870
2871 mutex_lock(hdl->lock);
2872
2873 /* Try to find it */
2874 ref = find_ref(hdl, id);
2875
2876 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2877 bool is_compound;
2878 /* Match any control that is not hidden */
2879 unsigned mask = 1;
2880 bool match = false;
2881
2882 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2883 /* Match any hidden control */
2884 match = true;
2885 } else if ((qc->id & next_flags) == next_flags) {
2886 /* Match any control, compound or not */
2887 mask = 0;
2888 }
2889
2890 /* Find the next control with ID > qc->id */
2891
2892 /* Did we reach the end of the control list? */
2893 if (id >= node2id(hdl->ctrl_refs.prev)) {
2894 ref = NULL; /* Yes, so there is no next control */
2895 } else if (ref) {
2896 /* We found a control with the given ID, so just get
2897 the next valid one in the list. */
2898 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2899 is_compound = ref->ctrl->is_array ||
2900 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2901 if (id < ref->ctrl->id &&
2902 (is_compound & mask) == match)
2903 break;
2904 }
2905 if (&ref->node == &hdl->ctrl_refs)
2906 ref = NULL;
2907 } else {
2908 /* No control with the given ID exists, so start
2909 searching for the next largest ID. We know there
2910 is one, otherwise the first 'if' above would have
2911 been true. */
2912 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2913 is_compound = ref->ctrl->is_array ||
2914 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2915 if (id < ref->ctrl->id &&
2916 (is_compound & mask) == match)
2917 break;
2918 }
2919 if (&ref->node == &hdl->ctrl_refs)
2920 ref = NULL;
2921 }
2922 }
2923 mutex_unlock(hdl->lock);
2924
2925 if (!ref)
2926 return -EINVAL;
2927
2928 ctrl = ref->ctrl;
2929 memset(qc, 0, sizeof(*qc));
2930 if (id >= V4L2_CID_PRIVATE_BASE)
2931 qc->id = id;
2932 else
2933 qc->id = ctrl->id;
2934 strscpy(qc->name, ctrl->name, sizeof(qc->name));
2935 qc->flags = user_flags(ctrl);
2936 qc->type = ctrl->type;
2937 qc->elem_size = ctrl->elem_size;
2938 qc->elems = ctrl->elems;
2939 qc->nr_of_dims = ctrl->nr_of_dims;
2940 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2941 qc->minimum = ctrl->minimum;
2942 qc->maximum = ctrl->maximum;
2943 qc->default_value = ctrl->default_value;
2944 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2945 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2946 qc->step = 1;
2947 else
2948 qc->step = ctrl->step;
2949 return 0;
2950 }
2951 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2952
2953 /* Implement VIDIOC_QUERYCTRL */
2954 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2955 {
2956 struct v4l2_query_ext_ctrl qec = { qc->id };
2957 int rc;
2958
2959 rc = v4l2_query_ext_ctrl(hdl, &qec);
2960 if (rc)
2961 return rc;
2962
2963 qc->id = qec.id;
2964 qc->type = qec.type;
2965 qc->flags = qec.flags;
2966 strscpy(qc->name, qec.name, sizeof(qc->name));
2967 switch (qc->type) {
2968 case V4L2_CTRL_TYPE_INTEGER:
2969 case V4L2_CTRL_TYPE_BOOLEAN:
2970 case V4L2_CTRL_TYPE_MENU:
2971 case V4L2_CTRL_TYPE_INTEGER_MENU:
2972 case V4L2_CTRL_TYPE_STRING:
2973 case V4L2_CTRL_TYPE_BITMASK:
2974 qc->minimum = qec.minimum;
2975 qc->maximum = qec.maximum;
2976 qc->step = qec.step;
2977 qc->default_value = qec.default_value;
2978 break;
2979 default:
2980 qc->minimum = 0;
2981 qc->maximum = 0;
2982 qc->step = 0;
2983 qc->default_value = 0;
2984 break;
2985 }
2986 return 0;
2987 }
2988 EXPORT_SYMBOL(v4l2_queryctrl);
2989
2990 /* Implement VIDIOC_QUERYMENU */
2991 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2992 {
2993 struct v4l2_ctrl *ctrl;
2994 u32 i = qm->index;
2995
2996 ctrl = v4l2_ctrl_find(hdl, qm->id);
2997 if (!ctrl)
2998 return -EINVAL;
2999
3000 qm->reserved = 0;
3001 /* Sanity checks */
3002 switch (ctrl->type) {
3003 case V4L2_CTRL_TYPE_MENU:
3004 if (ctrl->qmenu == NULL)
3005 return -EINVAL;
3006 break;
3007 case V4L2_CTRL_TYPE_INTEGER_MENU:
3008 if (ctrl->qmenu_int == NULL)
3009 return -EINVAL;
3010 break;
3011 default:
3012 return -EINVAL;
3013 }
3014
3015 if (i < ctrl->minimum || i > ctrl->maximum)
3016 return -EINVAL;
3017
3018 /* Use mask to see if this menu item should be skipped */
3019 if (ctrl->menu_skip_mask & (1ULL << i))
3020 return -EINVAL;
3021 /* Empty menu items should also be skipped */
3022 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
3023 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
3024 return -EINVAL;
3025 strscpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
3026 } else {
3027 qm->value = ctrl->qmenu_int[i];
3028 }
3029 return 0;
3030 }
3031 EXPORT_SYMBOL(v4l2_querymenu);
3032
3033 static int v4l2_ctrl_request_clone(struct v4l2_ctrl_handler *hdl,
3034 const struct v4l2_ctrl_handler *from)
3035 {
3036 struct v4l2_ctrl_ref *ref;
3037 int err = 0;
3038
3039 if (WARN_ON(!hdl || hdl == from))
3040 return -EINVAL;
3041
3042 if (hdl->error)
3043 return hdl->error;
3044
3045 WARN_ON(hdl->lock != &hdl->_lock);
3046
3047 mutex_lock(from->lock);
3048 list_for_each_entry(ref, &from->ctrl_refs, node) {
3049 struct v4l2_ctrl *ctrl = ref->ctrl;
3050 struct v4l2_ctrl_ref *new_ref;
3051
3052 /* Skip refs inherited from other devices */
3053 if (ref->from_other_dev)
3054 continue;
3055 /* And buttons */
3056 if (ctrl->type == V4L2_CTRL_TYPE_BUTTON)
3057 continue;
3058 err = handler_new_ref(hdl, ctrl, &new_ref, false, true);
3059 if (err)
3060 break;
3061 }
3062 mutex_unlock(from->lock);
3063 return err;
3064 }
3065
3066 static void v4l2_ctrl_request_queue(struct media_request_object *obj)
3067 {
3068 struct v4l2_ctrl_handler *hdl =
3069 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3070 struct v4l2_ctrl_handler *main_hdl = obj->priv;
3071 struct v4l2_ctrl_handler *prev_hdl = NULL;
3072 struct v4l2_ctrl_ref *ref_ctrl, *ref_ctrl_prev = NULL;
3073
3074 if (list_empty(&main_hdl->requests_queued))
3075 goto queue;
3076
3077 prev_hdl = list_last_entry(&main_hdl->requests_queued,
3078 struct v4l2_ctrl_handler, requests_queued);
3079 /*
3080 * Note: prev_hdl and hdl must contain the same list of control
3081 * references, so if any differences are detected then that is a
3082 * driver bug and the WARN_ON is triggered.
3083 */
3084 mutex_lock(prev_hdl->lock);
3085 ref_ctrl_prev = list_first_entry(&prev_hdl->ctrl_refs,
3086 struct v4l2_ctrl_ref, node);
3087 list_for_each_entry(ref_ctrl, &hdl->ctrl_refs, node) {
3088 if (ref_ctrl->req)
3089 continue;
3090 while (ref_ctrl_prev->ctrl->id < ref_ctrl->ctrl->id) {
3091 /* Should never happen, but just in case... */
3092 if (list_is_last(&ref_ctrl_prev->node,
3093 &prev_hdl->ctrl_refs))
3094 break;
3095 ref_ctrl_prev = list_next_entry(ref_ctrl_prev, node);
3096 }
3097 if (WARN_ON(ref_ctrl_prev->ctrl->id != ref_ctrl->ctrl->id))
3098 break;
3099 ref_ctrl->req = ref_ctrl_prev->req;
3100 }
3101 mutex_unlock(prev_hdl->lock);
3102 queue:
3103 list_add_tail(&hdl->requests_queued, &main_hdl->requests_queued);
3104 hdl->request_is_queued = true;
3105 }
3106
3107 static void v4l2_ctrl_request_unbind(struct media_request_object *obj)
3108 {
3109 struct v4l2_ctrl_handler *hdl =
3110 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3111
3112 list_del_init(&hdl->requests);
3113 if (hdl->request_is_queued) {
3114 list_del_init(&hdl->requests_queued);
3115 hdl->request_is_queued = false;
3116 }
3117 }
3118
3119 static void v4l2_ctrl_request_release(struct media_request_object *obj)
3120 {
3121 struct v4l2_ctrl_handler *hdl =
3122 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3123
3124 v4l2_ctrl_handler_free(hdl);
3125 kfree(hdl);
3126 }
3127
3128 static const struct media_request_object_ops req_ops = {
3129 .queue = v4l2_ctrl_request_queue,
3130 .unbind = v4l2_ctrl_request_unbind,
3131 .release = v4l2_ctrl_request_release,
3132 };
3133
3134 struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
3135 struct v4l2_ctrl_handler *parent)
3136 {
3137 struct media_request_object *obj;
3138
3139 if (WARN_ON(req->state != MEDIA_REQUEST_STATE_VALIDATING &&
3140 req->state != MEDIA_REQUEST_STATE_QUEUED))
3141 return NULL;
3142
3143 obj = media_request_object_find(req, &req_ops, parent);
3144 if (obj)
3145 return container_of(obj, struct v4l2_ctrl_handler, req_obj);
3146 return NULL;
3147 }
3148 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_find);
3149
3150 struct v4l2_ctrl *
3151 v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
3152 {
3153 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
3154
3155 return (ref && ref->req == ref) ? ref->ctrl : NULL;
3156 }
3157 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_ctrl_find);
3158
3159 static int v4l2_ctrl_request_bind(struct media_request *req,
3160 struct v4l2_ctrl_handler *hdl,
3161 struct v4l2_ctrl_handler *from)
3162 {
3163 int ret;
3164
3165 ret = v4l2_ctrl_request_clone(hdl, from);
3166
3167 if (!ret) {
3168 ret = media_request_object_bind(req, &req_ops,
3169 from, false, &hdl->req_obj);
3170 if (!ret)
3171 list_add_tail(&hdl->requests, &from->requests);
3172 }
3173 return ret;
3174 }
3175
3176 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
3177
3178 It is not a fully atomic operation, just best-effort only. After all, if
3179 multiple controls have to be set through multiple i2c writes (for example)
3180 then some initial writes may succeed while others fail. Thus leaving the
3181 system in an inconsistent state. The question is how much effort you are
3182 willing to spend on trying to make something atomic that really isn't.
3183
3184 From the point of view of an application the main requirement is that
3185 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
3186 error should be returned without actually affecting any controls.
3187
3188 If all the values are correct, then it is acceptable to just give up
3189 in case of low-level errors.
3190
3191 It is important though that the application can tell when only a partial
3192 configuration was done. The way we do that is through the error_idx field
3193 of struct v4l2_ext_controls: if that is equal to the count field then no
3194 controls were affected. Otherwise all controls before that index were
3195 successful in performing their 'get' or 'set' operation, the control at
3196 the given index failed, and you don't know what happened with the controls
3197 after the failed one. Since if they were part of a control cluster they
3198 could have been successfully processed (if a cluster member was encountered
3199 at index < error_idx), they could have failed (if a cluster member was at
3200 error_idx), or they may not have been processed yet (if the first cluster
3201 member appeared after error_idx).
3202
3203 It is all fairly theoretical, though. In practice all you can do is to
3204 bail out. If error_idx == count, then it is an application bug. If
3205 error_idx < count then it is only an application bug if the error code was
3206 EBUSY. That usually means that something started streaming just when you
3207 tried to set the controls. In all other cases it is a driver/hardware
3208 problem and all you can do is to retry or bail out.
3209
3210 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
3211 never modifies controls the error_idx is just set to whatever control
3212 has an invalid value.
3213 */
3214
3215 /* Prepare for the extended g/s/try functions.
3216 Find the controls in the control array and do some basic checks. */
3217 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
3218 struct v4l2_ext_controls *cs,
3219 struct v4l2_ctrl_helper *helpers,
3220 bool get)
3221 {
3222 struct v4l2_ctrl_helper *h;
3223 bool have_clusters = false;
3224 u32 i;
3225
3226 for (i = 0, h = helpers; i < cs->count; i++, h++) {
3227 struct v4l2_ext_control *c = &cs->controls[i];
3228 struct v4l2_ctrl_ref *ref;
3229 struct v4l2_ctrl *ctrl;
3230 u32 id = c->id & V4L2_CTRL_ID_MASK;
3231
3232 cs->error_idx = i;
3233
3234 if (cs->which &&
3235 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
3236 cs->which != V4L2_CTRL_WHICH_REQUEST_VAL &&
3237 V4L2_CTRL_ID2WHICH(id) != cs->which)
3238 return -EINVAL;
3239
3240 /* Old-style private controls are not allowed for
3241 extended controls */
3242 if (id >= V4L2_CID_PRIVATE_BASE)
3243 return -EINVAL;
3244 ref = find_ref_lock(hdl, id);
3245 if (ref == NULL)
3246 return -EINVAL;
3247 h->ref = ref;
3248 ctrl = ref->ctrl;
3249 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
3250 return -EINVAL;
3251
3252 if (ctrl->cluster[0]->ncontrols > 1)
3253 have_clusters = true;
3254 if (ctrl->cluster[0] != ctrl)
3255 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
3256 if (ctrl->is_ptr && !ctrl->is_string) {
3257 unsigned tot_size = ctrl->elems * ctrl->elem_size;
3258
3259 if (c->size < tot_size) {
3260 if (get) {
3261 c->size = tot_size;
3262 return -ENOSPC;
3263 }
3264 return -EFAULT;
3265 }
3266 c->size = tot_size;
3267 }
3268 /* Store the ref to the master control of the cluster */
3269 h->mref = ref;
3270 /* Initially set next to 0, meaning that there is no other
3271 control in this helper array belonging to the same
3272 cluster */
3273 h->next = 0;
3274 }
3275
3276 /* We are done if there were no controls that belong to a multi-
3277 control cluster. */
3278 if (!have_clusters)
3279 return 0;
3280
3281 /* The code below figures out in O(n) time which controls in the list
3282 belong to the same cluster. */
3283
3284 /* This has to be done with the handler lock taken. */
3285 mutex_lock(hdl->lock);
3286
3287 /* First zero the helper field in the master control references */
3288 for (i = 0; i < cs->count; i++)
3289 helpers[i].mref->helper = NULL;
3290 for (i = 0, h = helpers; i < cs->count; i++, h++) {
3291 struct v4l2_ctrl_ref *mref = h->mref;
3292
3293 /* If the mref->helper is set, then it points to an earlier
3294 helper that belongs to the same cluster. */
3295 if (mref->helper) {
3296 /* Set the next field of mref->helper to the current
3297 index: this means that that earlier helper now
3298 points to the next helper in the same cluster. */
3299 mref->helper->next = i;
3300 /* mref should be set only for the first helper in the
3301 cluster, clear the others. */
3302 h->mref = NULL;
3303 }
3304 /* Point the mref helper to the current helper struct. */
3305 mref->helper = h;
3306 }
3307 mutex_unlock(hdl->lock);
3308 return 0;
3309 }
3310
3311 /* Handles the corner case where cs->count == 0. It checks whether the
3312 specified control class exists. If that class ID is 0, then it checks
3313 whether there are any controls at all. */
3314 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
3315 {
3316 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL ||
3317 which == V4L2_CTRL_WHICH_REQUEST_VAL)
3318 return 0;
3319 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
3320 }
3321
3322 /* Get extended controls. Allocates the helpers array if needed. */
3323 static int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl,
3324 struct v4l2_ext_controls *cs)
3325 {
3326 struct v4l2_ctrl_helper helper[4];
3327 struct v4l2_ctrl_helper *helpers = helper;
3328 int ret;
3329 int i, j;
3330 bool def_value;
3331
3332 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
3333
3334 cs->error_idx = cs->count;
3335 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3336
3337 if (hdl == NULL)
3338 return -EINVAL;
3339
3340 if (cs->count == 0)
3341 return class_check(hdl, cs->which);
3342
3343 if (cs->count > ARRAY_SIZE(helper)) {
3344 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3345 GFP_KERNEL);
3346 if (helpers == NULL)
3347 return -ENOMEM;
3348 }
3349
3350 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
3351 cs->error_idx = cs->count;
3352
3353 for (i = 0; !ret && i < cs->count; i++)
3354 if (helpers[i].ref->ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3355 ret = -EACCES;
3356
3357 for (i = 0; !ret && i < cs->count; i++) {
3358 int (*ctrl_to_user)(struct v4l2_ext_control *c,
3359 struct v4l2_ctrl *ctrl);
3360 struct v4l2_ctrl *master;
3361
3362 ctrl_to_user = def_value ? def_to_user : cur_to_user;
3363
3364 if (helpers[i].mref == NULL)
3365 continue;
3366
3367 master = helpers[i].mref->ctrl;
3368 cs->error_idx = i;
3369
3370 v4l2_ctrl_lock(master);
3371
3372 /* g_volatile_ctrl will update the new control values */
3373 if (!def_value &&
3374 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
3375 (master->has_volatiles && !is_cur_manual(master)))) {
3376 for (j = 0; j < master->ncontrols; j++)
3377 cur_to_new(master->cluster[j]);
3378 ret = call_op(master, g_volatile_ctrl);
3379 ctrl_to_user = new_to_user;
3380 }
3381 /* If OK, then copy the current (for non-volatile controls)
3382 or the new (for volatile controls) control values to the
3383 caller */
3384 if (!ret) {
3385 u32 idx = i;
3386
3387 do {
3388 if (helpers[idx].ref->req)
3389 ret = req_to_user(cs->controls + idx,
3390 helpers[idx].ref->req);
3391 else
3392 ret = ctrl_to_user(cs->controls + idx,
3393 helpers[idx].ref->ctrl);
3394 idx = helpers[idx].next;
3395 } while (!ret && idx);
3396 }
3397 v4l2_ctrl_unlock(master);
3398 }
3399
3400 if (cs->count > ARRAY_SIZE(helper))
3401 kvfree(helpers);
3402 return ret;
3403 }
3404
3405 static struct media_request_object *
3406 v4l2_ctrls_find_req_obj(struct v4l2_ctrl_handler *hdl,
3407 struct media_request *req, bool set)
3408 {
3409 struct media_request_object *obj;
3410 struct v4l2_ctrl_handler *new_hdl;
3411 int ret;
3412
3413 if (IS_ERR(req))
3414 return ERR_CAST(req);
3415
3416 if (set && WARN_ON(req->state != MEDIA_REQUEST_STATE_UPDATING))
3417 return ERR_PTR(-EBUSY);
3418
3419 obj = media_request_object_find(req, &req_ops, hdl);
3420 if (obj)
3421 return obj;
3422 if (!set)
3423 return ERR_PTR(-ENOENT);
3424
3425 new_hdl = kzalloc(sizeof(*new_hdl), GFP_KERNEL);
3426 if (!new_hdl)
3427 return ERR_PTR(-ENOMEM);
3428
3429 obj = &new_hdl->req_obj;
3430 ret = v4l2_ctrl_handler_init(new_hdl, (hdl->nr_of_buckets - 1) * 8);
3431 if (!ret)
3432 ret = v4l2_ctrl_request_bind(req, new_hdl, hdl);
3433 if (ret) {
3434 kfree(new_hdl);
3435
3436 return ERR_PTR(ret);
3437 }
3438
3439 media_request_object_get(obj);
3440 return obj;
3441 }
3442
3443 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3444 struct v4l2_ext_controls *cs)
3445 {
3446 struct media_request_object *obj = NULL;
3447 struct media_request *req = NULL;
3448 int ret;
3449
3450 if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3451 if (!mdev || cs->request_fd < 0)
3452 return -EINVAL;
3453
3454 req = media_request_get_by_fd(mdev, cs->request_fd);
3455 if (IS_ERR(req))
3456 return PTR_ERR(req);
3457
3458 if (req->state != MEDIA_REQUEST_STATE_COMPLETE) {
3459 media_request_put(req);
3460 return -EACCES;
3461 }
3462
3463 ret = media_request_lock_for_access(req);
3464 if (ret) {
3465 media_request_put(req);
3466 return ret;
3467 }
3468
3469 obj = v4l2_ctrls_find_req_obj(hdl, req, false);
3470 if (IS_ERR(obj)) {
3471 media_request_unlock_for_access(req);
3472 media_request_put(req);
3473 return PTR_ERR(obj);
3474 }
3475
3476 hdl = container_of(obj, struct v4l2_ctrl_handler,
3477 req_obj);
3478 }
3479
3480 ret = v4l2_g_ext_ctrls_common(hdl, cs);
3481
3482 if (obj) {
3483 media_request_unlock_for_access(req);
3484 media_request_object_put(obj);
3485 media_request_put(req);
3486 }
3487 return ret;
3488 }
3489 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
3490
3491 /* Helper function to get a single control */
3492 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
3493 {
3494 struct v4l2_ctrl *master = ctrl->cluster[0];
3495 int ret = 0;
3496 int i;
3497
3498 /* Compound controls are not supported. The new_to_user() and
3499 * cur_to_user() calls below would need to be modified not to access
3500 * userspace memory when called from get_ctrl().
3501 */
3502 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
3503 return -EINVAL;
3504
3505 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3506 return -EACCES;
3507
3508 v4l2_ctrl_lock(master);
3509 /* g_volatile_ctrl will update the current control values */
3510 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3511 for (i = 0; i < master->ncontrols; i++)
3512 cur_to_new(master->cluster[i]);
3513 ret = call_op(master, g_volatile_ctrl);
3514 new_to_user(c, ctrl);
3515 } else {
3516 cur_to_user(c, ctrl);
3517 }
3518 v4l2_ctrl_unlock(master);
3519 return ret;
3520 }
3521
3522 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
3523 {
3524 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3525 struct v4l2_ext_control c;
3526 int ret;
3527
3528 if (ctrl == NULL || !ctrl->is_int)
3529 return -EINVAL;
3530 ret = get_ctrl(ctrl, &c);
3531 control->value = c.value;
3532 return ret;
3533 }
3534 EXPORT_SYMBOL(v4l2_g_ctrl);
3535
3536 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
3537 {
3538 struct v4l2_ext_control c;
3539
3540 /* It's a driver bug if this happens. */
3541 WARN_ON(!ctrl->is_int);
3542 c.value = 0;
3543 get_ctrl(ctrl, &c);
3544 return c.value;
3545 }
3546 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
3547
3548 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
3549 {
3550 struct v4l2_ext_control c;
3551
3552 /* It's a driver bug if this happens. */
3553 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3554 c.value64 = 0;
3555 get_ctrl(ctrl, &c);
3556 return c.value64;
3557 }
3558 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
3559
3560
3561 /* Core function that calls try/s_ctrl and ensures that the new value is
3562 copied to the current value on a set.
3563 Must be called with ctrl->handler->lock held. */
3564 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
3565 bool set, u32 ch_flags)
3566 {
3567 bool update_flag;
3568 int ret;
3569 int i;
3570
3571 /* Go through the cluster and either validate the new value or
3572 (if no new value was set), copy the current value to the new
3573 value, ensuring a consistent view for the control ops when
3574 called. */
3575 for (i = 0; i < master->ncontrols; i++) {
3576 struct v4l2_ctrl *ctrl = master->cluster[i];
3577
3578 if (ctrl == NULL)
3579 continue;
3580
3581 if (!ctrl->is_new) {
3582 cur_to_new(ctrl);
3583 continue;
3584 }
3585 /* Check again: it may have changed since the
3586 previous check in try_or_set_ext_ctrls(). */
3587 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3588 return -EBUSY;
3589 }
3590
3591 ret = call_op(master, try_ctrl);
3592
3593 /* Don't set if there is no change */
3594 if (ret || !set || !cluster_changed(master))
3595 return ret;
3596 ret = call_op(master, s_ctrl);
3597 if (ret)
3598 return ret;
3599
3600 /* If OK, then make the new values permanent. */
3601 update_flag = is_cur_manual(master) != is_new_manual(master);
3602
3603 for (i = 0; i < master->ncontrols; i++) {
3604 /*
3605 * If we switch from auto to manual mode, and this cluster
3606 * contains volatile controls, then all non-master controls
3607 * have to be marked as changed. The 'new' value contains
3608 * the volatile value (obtained by update_from_auto_cluster),
3609 * which now has to become the current value.
3610 */
3611 if (i && update_flag && is_new_manual(master) &&
3612 master->has_volatiles && master->cluster[i])
3613 master->cluster[i]->has_changed = true;
3614
3615 new_to_cur(fh, master->cluster[i], ch_flags |
3616 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3617 }
3618 return 0;
3619 }
3620
3621 /* Validate controls. */
3622 static int validate_ctrls(struct v4l2_ext_controls *cs,
3623 struct v4l2_ctrl_helper *helpers, bool set)
3624 {
3625 unsigned i;
3626 int ret = 0;
3627
3628 cs->error_idx = cs->count;
3629 for (i = 0; i < cs->count; i++) {
3630 struct v4l2_ctrl *ctrl = helpers[i].ref->ctrl;
3631 union v4l2_ctrl_ptr p_new;
3632
3633 cs->error_idx = i;
3634
3635 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3636 return -EACCES;
3637 /* This test is also done in try_set_control_cluster() which
3638 is called in atomic context, so that has the final say,
3639 but it makes sense to do an up-front check as well. Once
3640 an error occurs in try_set_control_cluster() some other
3641 controls may have been set already and we want to do a
3642 best-effort to avoid that. */
3643 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3644 return -EBUSY;
3645 /*
3646 * Skip validation for now if the payload needs to be copied
3647 * from userspace into kernelspace. We'll validate those later.
3648 */
3649 if (ctrl->is_ptr)
3650 continue;
3651 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3652 p_new.p_s64 = &cs->controls[i].value64;
3653 else
3654 p_new.p_s32 = &cs->controls[i].value;
3655 ret = validate_new(ctrl, p_new);
3656 if (ret)
3657 return ret;
3658 }
3659 return 0;
3660 }
3661
3662 /* Obtain the current volatile values of an autocluster and mark them
3663 as new. */
3664 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3665 {
3666 int i;
3667
3668 for (i = 1; i < master->ncontrols; i++)
3669 cur_to_new(master->cluster[i]);
3670 if (!call_op(master, g_volatile_ctrl))
3671 for (i = 1; i < master->ncontrols; i++)
3672 if (master->cluster[i])
3673 master->cluster[i]->is_new = 1;
3674 }
3675
3676 /* Try or try-and-set controls */
3677 static int try_set_ext_ctrls_common(struct v4l2_fh *fh,
3678 struct v4l2_ctrl_handler *hdl,
3679 struct v4l2_ext_controls *cs, bool set)
3680 {
3681 struct v4l2_ctrl_helper helper[4];
3682 struct v4l2_ctrl_helper *helpers = helper;
3683 unsigned i, j;
3684 int ret;
3685
3686 cs->error_idx = cs->count;
3687
3688 /* Default value cannot be changed */
3689 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3690 return -EINVAL;
3691
3692 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3693
3694 if (hdl == NULL)
3695 return -EINVAL;
3696
3697 if (cs->count == 0)
3698 return class_check(hdl, cs->which);
3699
3700 if (cs->count > ARRAY_SIZE(helper)) {
3701 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3702 GFP_KERNEL);
3703 if (!helpers)
3704 return -ENOMEM;
3705 }
3706 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3707 if (!ret)
3708 ret = validate_ctrls(cs, helpers, set);
3709 if (ret && set)
3710 cs->error_idx = cs->count;
3711 for (i = 0; !ret && i < cs->count; i++) {
3712 struct v4l2_ctrl *master;
3713 u32 idx = i;
3714
3715 if (helpers[i].mref == NULL)
3716 continue;
3717
3718 cs->error_idx = i;
3719 master = helpers[i].mref->ctrl;
3720 v4l2_ctrl_lock(master);
3721
3722 /* Reset the 'is_new' flags of the cluster */
3723 for (j = 0; j < master->ncontrols; j++)
3724 if (master->cluster[j])
3725 master->cluster[j]->is_new = 0;
3726
3727 /* For volatile autoclusters that are currently in auto mode
3728 we need to discover if it will be set to manual mode.
3729 If so, then we have to copy the current volatile values
3730 first since those will become the new manual values (which
3731 may be overwritten by explicit new values from this set
3732 of controls). */
3733 if (master->is_auto && master->has_volatiles &&
3734 !is_cur_manual(master)) {
3735 /* Pick an initial non-manual value */
3736 s32 new_auto_val = master->manual_mode_value + 1;
3737 u32 tmp_idx = idx;
3738
3739 do {
3740 /* Check if the auto control is part of the
3741 list, and remember the new value. */
3742 if (helpers[tmp_idx].ref->ctrl == master)
3743 new_auto_val = cs->controls[tmp_idx].value;
3744 tmp_idx = helpers[tmp_idx].next;
3745 } while (tmp_idx);
3746 /* If the new value == the manual value, then copy
3747 the current volatile values. */
3748 if (new_auto_val == master->manual_mode_value)
3749 update_from_auto_cluster(master);
3750 }
3751
3752 /* Copy the new caller-supplied control values.
3753 user_to_new() sets 'is_new' to 1. */
3754 do {
3755 struct v4l2_ctrl *ctrl = helpers[idx].ref->ctrl;
3756
3757 ret = user_to_new(cs->controls + idx, ctrl);
3758 if (!ret && ctrl->is_ptr)
3759 ret = validate_new(ctrl, ctrl->p_new);
3760 idx = helpers[idx].next;
3761 } while (!ret && idx);
3762
3763 if (!ret)
3764 ret = try_or_set_cluster(fh, master,
3765 !hdl->req_obj.req && set, 0);
3766 if (!ret && hdl->req_obj.req && set) {
3767 for (j = 0; j < master->ncontrols; j++) {
3768 struct v4l2_ctrl_ref *ref =
3769 find_ref(hdl, master->cluster[j]->id);
3770
3771 new_to_req(ref);
3772 }
3773 }
3774
3775 /* Copy the new values back to userspace. */
3776 if (!ret) {
3777 idx = i;
3778 do {
3779 ret = new_to_user(cs->controls + idx,
3780 helpers[idx].ref->ctrl);
3781 idx = helpers[idx].next;
3782 } while (!ret && idx);
3783 }
3784 v4l2_ctrl_unlock(master);
3785 }
3786
3787 if (cs->count > ARRAY_SIZE(helper))
3788 kvfree(helpers);
3789 return ret;
3790 }
3791
3792 static int try_set_ext_ctrls(struct v4l2_fh *fh,
3793 struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3794 struct v4l2_ext_controls *cs, bool set)
3795 {
3796 struct media_request_object *obj = NULL;
3797 struct media_request *req = NULL;
3798 int ret;
3799
3800 if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3801 if (!mdev || cs->request_fd < 0)
3802 return -EINVAL;
3803
3804 req = media_request_get_by_fd(mdev, cs->request_fd);
3805 if (IS_ERR(req))
3806 return PTR_ERR(req);
3807
3808 ret = media_request_lock_for_update(req);
3809 if (ret) {
3810 media_request_put(req);
3811 return ret;
3812 }
3813
3814 obj = v4l2_ctrls_find_req_obj(hdl, req, set);
3815 if (IS_ERR(obj)) {
3816 media_request_unlock_for_update(req);
3817 media_request_put(req);
3818 return PTR_ERR(obj);
3819 }
3820 hdl = container_of(obj, struct v4l2_ctrl_handler,
3821 req_obj);
3822 }
3823
3824 ret = try_set_ext_ctrls_common(fh, hdl, cs, set);
3825
3826 if (obj) {
3827 media_request_unlock_for_update(req);
3828 media_request_object_put(obj);
3829 media_request_put(req);
3830 }
3831
3832 return ret;
3833 }
3834
3835 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3836 struct v4l2_ext_controls *cs)
3837 {
3838 return try_set_ext_ctrls(NULL, hdl, mdev, cs, false);
3839 }
3840 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3841
3842 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3843 struct media_device *mdev, struct v4l2_ext_controls *cs)
3844 {
3845 return try_set_ext_ctrls(fh, hdl, mdev, cs, true);
3846 }
3847 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3848
3849 /* Helper function for VIDIOC_S_CTRL compatibility */
3850 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3851 {
3852 struct v4l2_ctrl *master = ctrl->cluster[0];
3853 int ret;
3854 int i;
3855
3856 /* Reset the 'is_new' flags of the cluster */
3857 for (i = 0; i < master->ncontrols; i++)
3858 if (master->cluster[i])
3859 master->cluster[i]->is_new = 0;
3860
3861 ret = validate_new(ctrl, ctrl->p_new);
3862 if (ret)
3863 return ret;
3864
3865 /* For autoclusters with volatiles that are switched from auto to
3866 manual mode we have to update the current volatile values since
3867 those will become the initial manual values after such a switch. */
3868 if (master->is_auto && master->has_volatiles && ctrl == master &&
3869 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3870 update_from_auto_cluster(master);
3871
3872 ctrl->is_new = 1;
3873 return try_or_set_cluster(fh, master, true, ch_flags);
3874 }
3875
3876 /* Helper function for VIDIOC_S_CTRL compatibility */
3877 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3878 struct v4l2_ext_control *c)
3879 {
3880 int ret;
3881
3882 v4l2_ctrl_lock(ctrl);
3883 user_to_new(c, ctrl);
3884 ret = set_ctrl(fh, ctrl, 0);
3885 if (!ret)
3886 cur_to_user(c, ctrl);
3887 v4l2_ctrl_unlock(ctrl);
3888 return ret;
3889 }
3890
3891 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3892 struct v4l2_control *control)
3893 {
3894 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3895 struct v4l2_ext_control c = { control->id };
3896 int ret;
3897
3898 if (ctrl == NULL || !ctrl->is_int)
3899 return -EINVAL;
3900
3901 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3902 return -EACCES;
3903
3904 c.value = control->value;
3905 ret = set_ctrl_lock(fh, ctrl, &c);
3906 control->value = c.value;
3907 return ret;
3908 }
3909 EXPORT_SYMBOL(v4l2_s_ctrl);
3910
3911 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3912 {
3913 lockdep_assert_held(ctrl->handler->lock);
3914
3915 /* It's a driver bug if this happens. */
3916 WARN_ON(!ctrl->is_int);
3917 ctrl->val = val;
3918 return set_ctrl(NULL, ctrl, 0);
3919 }
3920 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3921
3922 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3923 {
3924 lockdep_assert_held(ctrl->handler->lock);
3925
3926 /* It's a driver bug if this happens. */
3927 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3928 *ctrl->p_new.p_s64 = val;
3929 return set_ctrl(NULL, ctrl, 0);
3930 }
3931 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3932
3933 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3934 {
3935 lockdep_assert_held(ctrl->handler->lock);
3936
3937 /* It's a driver bug if this happens. */
3938 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3939 strscpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3940 return set_ctrl(NULL, ctrl, 0);
3941 }
3942 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3943
3944 void v4l2_ctrl_request_complete(struct media_request *req,
3945 struct v4l2_ctrl_handler *main_hdl)
3946 {
3947 struct media_request_object *obj;
3948 struct v4l2_ctrl_handler *hdl;
3949 struct v4l2_ctrl_ref *ref;
3950
3951 if (!req || !main_hdl)
3952 return;
3953
3954 /*
3955 * Note that it is valid if nothing was found. It means
3956 * that this request doesn't have any controls and so just
3957 * wants to leave the controls unchanged.
3958 */
3959 obj = media_request_object_find(req, &req_ops, main_hdl);
3960 if (!obj)
3961 return;
3962 hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
3963
3964 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
3965 struct v4l2_ctrl *ctrl = ref->ctrl;
3966 struct v4l2_ctrl *master = ctrl->cluster[0];
3967 unsigned int i;
3968
3969 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3970 ref->req = ref;
3971
3972 v4l2_ctrl_lock(master);
3973 /* g_volatile_ctrl will update the current control values */
3974 for (i = 0; i < master->ncontrols; i++)
3975 cur_to_new(master->cluster[i]);
3976 call_op(master, g_volatile_ctrl);
3977 new_to_req(ref);
3978 v4l2_ctrl_unlock(master);
3979 continue;
3980 }
3981 if (ref->req == ref)
3982 continue;
3983
3984 v4l2_ctrl_lock(ctrl);
3985 if (ref->req)
3986 ptr_to_ptr(ctrl, ref->req->p_req, ref->p_req);
3987 else
3988 ptr_to_ptr(ctrl, ctrl->p_cur, ref->p_req);
3989 v4l2_ctrl_unlock(ctrl);
3990 }
3991
3992 WARN_ON(!hdl->request_is_queued);
3993 list_del_init(&hdl->requests_queued);
3994 hdl->request_is_queued = false;
3995 media_request_object_complete(obj);
3996 media_request_object_put(obj);
3997 }
3998 EXPORT_SYMBOL(v4l2_ctrl_request_complete);
3999
4000 int v4l2_ctrl_request_setup(struct media_request *req,
4001 struct v4l2_ctrl_handler *main_hdl)
4002 {
4003 struct media_request_object *obj;
4004 struct v4l2_ctrl_handler *hdl;
4005 struct v4l2_ctrl_ref *ref;
4006 int ret = 0;
4007
4008 if (!req || !main_hdl)
4009 return 0;
4010
4011 if (WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED))
4012 return -EBUSY;
4013
4014 /*
4015 * Note that it is valid if nothing was found. It means
4016 * that this request doesn't have any controls and so just
4017 * wants to leave the controls unchanged.
4018 */
4019 obj = media_request_object_find(req, &req_ops, main_hdl);
4020 if (!obj)
4021 return 0;
4022 if (obj->completed) {
4023 media_request_object_put(obj);
4024 return -EBUSY;
4025 }
4026 hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
4027
4028 list_for_each_entry(ref, &hdl->ctrl_refs, node)
4029 ref->req_done = false;
4030
4031 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
4032 struct v4l2_ctrl *ctrl = ref->ctrl;
4033 struct v4l2_ctrl *master = ctrl->cluster[0];
4034 bool have_new_data = false;
4035 int i;
4036
4037 /*
4038 * Skip if this control was already handled by a cluster.
4039 * Skip button controls and read-only controls.
4040 */
4041 if (ref->req_done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
4042 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
4043 continue;
4044
4045 v4l2_ctrl_lock(master);
4046 for (i = 0; i < master->ncontrols; i++) {
4047 if (master->cluster[i]) {
4048 struct v4l2_ctrl_ref *r =
4049 find_ref(hdl, master->cluster[i]->id);
4050
4051 if (r->req && r == r->req) {
4052 have_new_data = true;
4053 break;
4054 }
4055 }
4056 }
4057 if (!have_new_data) {
4058 v4l2_ctrl_unlock(master);
4059 continue;
4060 }
4061
4062 for (i = 0; i < master->ncontrols; i++) {
4063 if (master->cluster[i]) {
4064 struct v4l2_ctrl_ref *r =
4065 find_ref(hdl, master->cluster[i]->id);
4066
4067 req_to_new(r);
4068 master->cluster[i]->is_new = 1;
4069 r->req_done = true;
4070 }
4071 }
4072 /*
4073 * For volatile autoclusters that are currently in auto mode
4074 * we need to discover if it will be set to manual mode.
4075 * If so, then we have to copy the current volatile values
4076 * first since those will become the new manual values (which
4077 * may be overwritten by explicit new values from this set
4078 * of controls).
4079 */
4080 if (master->is_auto && master->has_volatiles &&
4081 !is_cur_manual(master)) {
4082 s32 new_auto_val = *master->p_new.p_s32;
4083
4084 /*
4085 * If the new value == the manual value, then copy
4086 * the current volatile values.
4087 */
4088 if (new_auto_val == master->manual_mode_value)
4089 update_from_auto_cluster(master);
4090 }
4091
4092 ret = try_or_set_cluster(NULL, master, true, 0);
4093 v4l2_ctrl_unlock(master);
4094
4095 if (ret)
4096 break;
4097 }
4098
4099 media_request_object_put(obj);
4100 return ret;
4101 }
4102 EXPORT_SYMBOL(v4l2_ctrl_request_setup);
4103
4104 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
4105 {
4106 if (ctrl == NULL)
4107 return;
4108 if (notify == NULL) {
4109 ctrl->call_notify = 0;
4110 return;
4111 }
4112 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
4113 return;
4114 ctrl->handler->notify = notify;
4115 ctrl->handler->notify_priv = priv;
4116 ctrl->call_notify = 1;
4117 }
4118 EXPORT_SYMBOL(v4l2_ctrl_notify);
4119
4120 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
4121 s64 min, s64 max, u64 step, s64 def)
4122 {
4123 bool value_changed;
4124 bool range_changed = false;
4125 int ret;
4126
4127 lockdep_assert_held(ctrl->handler->lock);
4128
4129 switch (ctrl->type) {
4130 case V4L2_CTRL_TYPE_INTEGER:
4131 case V4L2_CTRL_TYPE_INTEGER64:
4132 case V4L2_CTRL_TYPE_BOOLEAN:
4133 case V4L2_CTRL_TYPE_MENU:
4134 case V4L2_CTRL_TYPE_INTEGER_MENU:
4135 case V4L2_CTRL_TYPE_BITMASK:
4136 case V4L2_CTRL_TYPE_U8:
4137 case V4L2_CTRL_TYPE_U16:
4138 case V4L2_CTRL_TYPE_U32:
4139 if (ctrl->is_array)
4140 return -EINVAL;
4141 ret = check_range(ctrl->type, min, max, step, def);
4142 if (ret)
4143 return ret;
4144 break;
4145 default:
4146 return -EINVAL;
4147 }
4148 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
4149 (ctrl->step != step) || ctrl->default_value != def) {
4150 range_changed = true;
4151 ctrl->minimum = min;
4152 ctrl->maximum = max;
4153 ctrl->step = step;
4154 ctrl->default_value = def;
4155 }
4156 cur_to_new(ctrl);
4157 if (validate_new(ctrl, ctrl->p_new)) {
4158 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4159 *ctrl->p_new.p_s64 = def;
4160 else
4161 *ctrl->p_new.p_s32 = def;
4162 }
4163
4164 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4165 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
4166 else
4167 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
4168 if (value_changed)
4169 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4170 else if (range_changed)
4171 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4172 return ret;
4173 }
4174 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
4175
4176 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
4177 {
4178 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4179
4180 if (ctrl == NULL)
4181 return -EINVAL;
4182
4183 v4l2_ctrl_lock(ctrl);
4184 list_add_tail(&sev->node, &ctrl->ev_subs);
4185 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
4186 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
4187 struct v4l2_event ev;
4188 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
4189
4190 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
4191 changes |= V4L2_EVENT_CTRL_CH_VALUE;
4192 fill_event(&ev, ctrl, changes);
4193 /* Mark the queue as active, allowing this initial
4194 event to be accepted. */
4195 sev->elems = elems;
4196 v4l2_event_queue_fh(sev->fh, &ev);
4197 }
4198 v4l2_ctrl_unlock(ctrl);
4199 return 0;
4200 }
4201
4202 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
4203 {
4204 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4205
4206 if (ctrl == NULL)
4207 return;
4208
4209 v4l2_ctrl_lock(ctrl);
4210 list_del(&sev->node);
4211 v4l2_ctrl_unlock(ctrl);
4212 }
4213
4214 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
4215 {
4216 u32 old_changes = old->u.ctrl.changes;
4217
4218 old->u.ctrl = new->u.ctrl;
4219 old->u.ctrl.changes |= old_changes;
4220 }
4221 EXPORT_SYMBOL(v4l2_ctrl_replace);
4222
4223 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
4224 {
4225 new->u.ctrl.changes |= old->u.ctrl.changes;
4226 }
4227 EXPORT_SYMBOL(v4l2_ctrl_merge);
4228
4229 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
4230 .add = v4l2_ctrl_add_event,
4231 .del = v4l2_ctrl_del_event,
4232 .replace = v4l2_ctrl_replace,
4233 .merge = v4l2_ctrl_merge,
4234 };
4235 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
4236
4237 int v4l2_ctrl_log_status(struct file *file, void *fh)
4238 {
4239 struct video_device *vfd = video_devdata(file);
4240 struct v4l2_fh *vfh = file->private_data;
4241
4242 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
4243 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
4244 vfd->v4l2_dev->name);
4245 return 0;
4246 }
4247 EXPORT_SYMBOL(v4l2_ctrl_log_status);
4248
4249 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
4250 const struct v4l2_event_subscription *sub)
4251 {
4252 if (sub->type == V4L2_EVENT_CTRL)
4253 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
4254 return -EINVAL;
4255 }
4256 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
4257
4258 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
4259 struct v4l2_event_subscription *sub)
4260 {
4261 if (!sd->ctrl_handler)
4262 return -EINVAL;
4263 return v4l2_ctrl_subscribe_event(fh, sub);
4264 }
4265 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
4266
4267 __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
4268 {
4269 struct v4l2_fh *fh = file->private_data;
4270
4271 poll_wait(file, &fh->wait, wait);
4272 if (v4l2_event_pending(fh))
4273 return EPOLLPRI;
4274 return 0;
4275 }
4276 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux with added FPC-III support