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dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / media / v4l2-core / v4l2-ctrls.c
blob523758e71fe6a4c65f80ad581d8f0f5930a308b1
1 /*
2 V4L2 controls framework implementation.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/ctype.h>
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-event.h>
28 #include <media/v4l2-dev.h>
29
30 #define has_op(master, op) \
31 (master->ops && master->ops->op)
32 #define call_op(master, op) \
33 (has_op(master, op) ? master->ops->op(master) : 0)
34
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl *ctrl;
41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
43 u32 next;
44 };
45
46 /* Small helper function to determine if the autocluster is set to manual
47 mode. */
48 static bool is_cur_manual(const struct v4l2_ctrl *master)
49 {
50 return master->is_auto && master->cur.val == master->manual_mode_value;
51 }
52
53 /* Same as above, but this checks the against the new value instead of the
54 current value. */
55 static bool is_new_manual(const struct v4l2_ctrl *master)
56 {
57 return master->is_auto && master->val == master->manual_mode_value;
58 }
59
60 /* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
64 const char * const *v4l2_ctrl_get_menu(u32 id)
65 {
66 static const char * const mpeg_audio_sampling_freq[] = {
67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
72 static const char * const mpeg_audio_encoding[] = {
73 "MPEG-1/2 Layer I",
74 "MPEG-1/2 Layer II",
75 "MPEG-1/2 Layer III",
76 "MPEG-2/4 AAC",
77 "AC-3",
78 NULL
79 };
80 static const char * const mpeg_audio_l1_bitrate[] = {
81 "32 kbps",
82 "64 kbps",
83 "96 kbps",
84 "128 kbps",
85 "160 kbps",
86 "192 kbps",
87 "224 kbps",
88 "256 kbps",
89 "288 kbps",
90 "320 kbps",
91 "352 kbps",
92 "384 kbps",
93 "416 kbps",
94 "448 kbps",
95 NULL
96 };
97 static const char * const mpeg_audio_l2_bitrate[] = {
98 "32 kbps",
99 "48 kbps",
100 "56 kbps",
101 "64 kbps",
102 "80 kbps",
103 "96 kbps",
104 "112 kbps",
105 "128 kbps",
106 "160 kbps",
107 "192 kbps",
108 "224 kbps",
109 "256 kbps",
110 "320 kbps",
111 "384 kbps",
112 NULL
113 };
114 static const char * const mpeg_audio_l3_bitrate[] = {
115 "32 kbps",
116 "40 kbps",
117 "48 kbps",
118 "56 kbps",
119 "64 kbps",
120 "80 kbps",
121 "96 kbps",
122 "112 kbps",
123 "128 kbps",
124 "160 kbps",
125 "192 kbps",
126 "224 kbps",
127 "256 kbps",
128 "320 kbps",
129 NULL
130 };
131 static const char * const mpeg_audio_ac3_bitrate[] = {
132 "32 kbps",
133 "40 kbps",
134 "48 kbps",
135 "56 kbps",
136 "64 kbps",
137 "80 kbps",
138 "96 kbps",
139 "112 kbps",
140 "128 kbps",
141 "160 kbps",
142 "192 kbps",
143 "224 kbps",
144 "256 kbps",
145 "320 kbps",
146 "384 kbps",
147 "448 kbps",
148 "512 kbps",
149 "576 kbps",
150 "640 kbps",
151 NULL
152 };
153 static const char * const mpeg_audio_mode[] = {
154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
160 static const char * const mpeg_audio_mode_extension[] = {
161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
167 static const char * const mpeg_audio_emphasis[] = {
168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
173 static const char * const mpeg_audio_crc[] = {
174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
178 static const char * const mpeg_audio_dec_playback[] = {
179 "Auto",
180 "Stereo",
181 "Left",
182 "Right",
183 "Mono",
184 "Swapped Stereo",
185 NULL
186 };
187 static const char * const mpeg_video_encoding[] = {
188 "MPEG-1",
189 "MPEG-2",
190 "MPEG-4 AVC",
191 NULL
192 };
193 static const char * const mpeg_video_aspect[] = {
194 "1x1",
195 "4x3",
196 "16x9",
197 "2.21x1",
198 NULL
199 };
200 static const char * const mpeg_video_bitrate_mode[] = {
201 "Variable Bitrate",
202 "Constant Bitrate",
203 NULL
204 };
205 static const char * const mpeg_stream_type[] = {
206 "MPEG-2 Program Stream",
207 "MPEG-2 Transport Stream",
208 "MPEG-1 System Stream",
209 "MPEG-2 DVD-compatible Stream",
210 "MPEG-1 VCD-compatible Stream",
211 "MPEG-2 SVCD-compatible Stream",
212 NULL
213 };
214 static const char * const mpeg_stream_vbi_fmt[] = {
215 "No VBI",
216 "Private Packet, IVTV Format",
217 NULL
218 };
219 static const char * const camera_power_line_frequency[] = {
220 "Disabled",
221 "50 Hz",
222 "60 Hz",
223 "Auto",
224 NULL
225 };
226 static const char * const camera_exposure_auto[] = {
227 "Auto Mode",
228 "Manual Mode",
229 "Shutter Priority Mode",
230 "Aperture Priority Mode",
231 NULL
232 };
233 static const char * const camera_exposure_metering[] = {
234 "Average",
235 "Center Weighted",
236 "Spot",
237 "Matrix",
238 NULL
239 };
240 static const char * const camera_auto_focus_range[] = {
241 "Auto",
242 "Normal",
243 "Macro",
244 "Infinity",
245 NULL
246 };
247 static const char * const colorfx[] = {
248 "None",
249 "Black & White",
250 "Sepia",
251 "Negative",
252 "Emboss",
253 "Sketch",
254 "Sky Blue",
255 "Grass Green",
256 "Skin Whiten",
257 "Vivid",
258 "Aqua",
259 "Art Freeze",
260 "Silhouette",
261 "Solarization",
262 "Antique",
263 "Set Cb/Cr",
264 NULL
265 };
266 static const char * const auto_n_preset_white_balance[] = {
267 "Manual",
268 "Auto",
269 "Incandescent",
270 "Fluorescent",
271 "Fluorescent H",
272 "Horizon",
273 "Daylight",
274 "Flash",
275 "Cloudy",
276 "Shade",
277 NULL,
278 };
279 static const char * const camera_iso_sensitivity_auto[] = {
280 "Manual",
281 "Auto",
282 NULL
283 };
284 static const char * const scene_mode[] = {
285 "None",
286 "Backlight",
287 "Beach/Snow",
288 "Candle Light",
289 "Dusk/Dawn",
290 "Fall Colors",
291 "Fireworks",
292 "Landscape",
293 "Night",
294 "Party/Indoor",
295 "Portrait",
296 "Sports",
297 "Sunset",
298 "Text",
299 NULL
300 };
301 static const char * const tune_emphasis[] = {
302 "None",
303 "50 Microseconds",
304 "75 Microseconds",
305 NULL,
306 };
307 static const char * const header_mode[] = {
308 "Separate Buffer",
309 "Joined With 1st Frame",
310 NULL,
311 };
312 static const char * const multi_slice[] = {
313 "Single",
314 "Max Macroblocks",
315 "Max Bytes",
316 NULL,
317 };
318 static const char * const entropy_mode[] = {
319 "CAVLC",
320 "CABAC",
321 NULL,
322 };
323 static const char * const mpeg_h264_level[] = {
324 "1",
325 "1b",
326 "1.1",
327 "1.2",
328 "1.3",
329 "2",
330 "2.1",
331 "2.2",
332 "3",
333 "3.1",
334 "3.2",
335 "4",
336 "4.1",
337 "4.2",
338 "5",
339 "5.1",
340 NULL,
341 };
342 static const char * const h264_loop_filter[] = {
343 "Enabled",
344 "Disabled",
345 "Disabled at Slice Boundary",
346 NULL,
347 };
348 static const char * const h264_profile[] = {
349 "Baseline",
350 "Constrained Baseline",
351 "Main",
352 "Extended",
353 "High",
354 "High 10",
355 "High 422",
356 "High 444 Predictive",
357 "High 10 Intra",
358 "High 422 Intra",
359 "High 444 Intra",
360 "CAVLC 444 Intra",
361 "Scalable Baseline",
362 "Scalable High",
363 "Scalable High Intra",
364 "Multiview High",
365 NULL,
366 };
367 static const char * const vui_sar_idc[] = {
368 "Unspecified",
369 "1:1",
370 "12:11",
371 "10:11",
372 "16:11",
373 "40:33",
374 "24:11",
375 "20:11",
376 "32:11",
377 "80:33",
378 "18:11",
379 "15:11",
380 "64:33",
381 "160:99",
382 "4:3",
383 "3:2",
384 "2:1",
385 "Extended SAR",
386 NULL,
387 };
388 static const char * const h264_fp_arrangement_type[] = {
389 "Checkerboard",
390 "Column",
391 "Row",
392 "Side by Side",
393 "Top Bottom",
394 "Temporal",
395 NULL,
396 };
397 static const char * const h264_fmo_map_type[] = {
398 "Interleaved Slices",
399 "Scattered Slices",
400 "Foreground with Leftover",
401 "Box Out",
402 "Raster Scan",
403 "Wipe Scan",
404 "Explicit",
405 NULL,
406 };
407 static const char * const mpeg_mpeg4_level[] = {
408 "0",
409 "0b",
410 "1",
411 "2",
412 "3",
413 "3b",
414 "4",
415 "5",
416 NULL,
417 };
418 static const char * const mpeg4_profile[] = {
419 "Simple",
420 "Advanced Simple",
421 "Core",
422 "Simple Scalable",
423 "Advanced Coding Efficiency",
424 NULL,
425 };
426
427 static const char * const vpx_golden_frame_sel[] = {
428 "Use Previous Frame",
429 "Use Previous Specific Frame",
430 NULL,
431 };
432
433 static const char * const flash_led_mode[] = {
434 "Off",
435 "Flash",
436 "Torch",
437 NULL,
438 };
439 static const char * const flash_strobe_source[] = {
440 "Software",
441 "External",
442 NULL,
443 };
444
445 static const char * const jpeg_chroma_subsampling[] = {
446 "4:4:4",
447 "4:2:2",
448 "4:2:0",
449 "4:1:1",
450 "4:1:0",
451 "Gray",
452 NULL,
453 };
454 static const char * const dv_tx_mode[] = {
455 "DVI-D",
456 "HDMI",
457 NULL,
458 };
459 static const char * const dv_rgb_range[] = {
460 "Automatic",
461 "RGB limited range (16-235)",
462 "RGB full range (0-255)",
463 NULL,
464 };
465 static const char * const detect_md_mode[] = {
466 "Disabled",
467 "Global",
468 "Threshold Grid",
469 "Region Grid",
470 NULL,
471 };
472
473
474 switch (id) {
475 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
476 return mpeg_audio_sampling_freq;
477 case V4L2_CID_MPEG_AUDIO_ENCODING:
478 return mpeg_audio_encoding;
479 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
480 return mpeg_audio_l1_bitrate;
481 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
482 return mpeg_audio_l2_bitrate;
483 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
484 return mpeg_audio_l3_bitrate;
485 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
486 return mpeg_audio_ac3_bitrate;
487 case V4L2_CID_MPEG_AUDIO_MODE:
488 return mpeg_audio_mode;
489 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
490 return mpeg_audio_mode_extension;
491 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
492 return mpeg_audio_emphasis;
493 case V4L2_CID_MPEG_AUDIO_CRC:
494 return mpeg_audio_crc;
495 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
496 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
497 return mpeg_audio_dec_playback;
498 case V4L2_CID_MPEG_VIDEO_ENCODING:
499 return mpeg_video_encoding;
500 case V4L2_CID_MPEG_VIDEO_ASPECT:
501 return mpeg_video_aspect;
502 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
503 return mpeg_video_bitrate_mode;
504 case V4L2_CID_MPEG_STREAM_TYPE:
505 return mpeg_stream_type;
506 case V4L2_CID_MPEG_STREAM_VBI_FMT:
507 return mpeg_stream_vbi_fmt;
508 case V4L2_CID_POWER_LINE_FREQUENCY:
509 return camera_power_line_frequency;
510 case V4L2_CID_EXPOSURE_AUTO:
511 return camera_exposure_auto;
512 case V4L2_CID_EXPOSURE_METERING:
513 return camera_exposure_metering;
514 case V4L2_CID_AUTO_FOCUS_RANGE:
515 return camera_auto_focus_range;
516 case V4L2_CID_COLORFX:
517 return colorfx;
518 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
519 return auto_n_preset_white_balance;
520 case V4L2_CID_ISO_SENSITIVITY_AUTO:
521 return camera_iso_sensitivity_auto;
522 case V4L2_CID_SCENE_MODE:
523 return scene_mode;
524 case V4L2_CID_TUNE_PREEMPHASIS:
525 return tune_emphasis;
526 case V4L2_CID_TUNE_DEEMPHASIS:
527 return tune_emphasis;
528 case V4L2_CID_FLASH_LED_MODE:
529 return flash_led_mode;
530 case V4L2_CID_FLASH_STROBE_SOURCE:
531 return flash_strobe_source;
532 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
533 return header_mode;
534 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
535 return multi_slice;
536 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
537 return entropy_mode;
538 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
539 return mpeg_h264_level;
540 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
541 return h264_loop_filter;
542 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
543 return h264_profile;
544 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
545 return vui_sar_idc;
546 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
547 return h264_fp_arrangement_type;
548 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
549 return h264_fmo_map_type;
550 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
551 return mpeg_mpeg4_level;
552 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
553 return mpeg4_profile;
554 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
555 return vpx_golden_frame_sel;
556 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
557 return jpeg_chroma_subsampling;
558 case V4L2_CID_DV_TX_MODE:
559 return dv_tx_mode;
560 case V4L2_CID_DV_TX_RGB_RANGE:
561 case V4L2_CID_DV_RX_RGB_RANGE:
562 return dv_rgb_range;
563 case V4L2_CID_DETECT_MD_MODE:
564 return detect_md_mode;
565
566 default:
567 return NULL;
568 }
569 }
570 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
571
572 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
573 /*
574 * Returns NULL or an s64 type array containing the menu for given
575 * control ID. The total number of the menu items is returned in @len.
576 */
577 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
578 {
579 static const s64 qmenu_int_vpx_num_partitions[] = {
580 1, 2, 4, 8,
581 };
582
583 static const s64 qmenu_int_vpx_num_ref_frames[] = {
584 1, 2, 3,
585 };
586
587 switch (id) {
588 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
589 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
590 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
591 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
592 default:
593 *len = 0;
594 return NULL;
595 }
596 }
597 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
598
599 /* Return the control name. */
600 const char *v4l2_ctrl_get_name(u32 id)
601 {
602 switch (id) {
603 /* USER controls */
604 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
605 case V4L2_CID_USER_CLASS: return "User Controls";
606 case V4L2_CID_BRIGHTNESS: return "Brightness";
607 case V4L2_CID_CONTRAST: return "Contrast";
608 case V4L2_CID_SATURATION: return "Saturation";
609 case V4L2_CID_HUE: return "Hue";
610 case V4L2_CID_AUDIO_VOLUME: return "Volume";
611 case V4L2_CID_AUDIO_BALANCE: return "Balance";
612 case V4L2_CID_AUDIO_BASS: return "Bass";
613 case V4L2_CID_AUDIO_TREBLE: return "Treble";
614 case V4L2_CID_AUDIO_MUTE: return "Mute";
615 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
616 case V4L2_CID_BLACK_LEVEL: return "Black Level";
617 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
618 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
619 case V4L2_CID_RED_BALANCE: return "Red Balance";
620 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
621 case V4L2_CID_GAMMA: return "Gamma";
622 case V4L2_CID_EXPOSURE: return "Exposure";
623 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
624 case V4L2_CID_GAIN: return "Gain";
625 case V4L2_CID_HFLIP: return "Horizontal Flip";
626 case V4L2_CID_VFLIP: return "Vertical Flip";
627 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
628 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
629 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
630 case V4L2_CID_SHARPNESS: return "Sharpness";
631 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
632 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
633 case V4L2_CID_COLOR_KILLER: return "Color Killer";
634 case V4L2_CID_COLORFX: return "Color Effects";
635 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
636 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
637 case V4L2_CID_ROTATE: return "Rotate";
638 case V4L2_CID_BG_COLOR: return "Background Color";
639 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
640 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
641 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
642 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
643 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
644 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
645 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
646
647 /* Codec controls */
648 /* The MPEG controls are applicable to all codec controls
649 * and the 'MPEG' part of the define is historical */
650 /* Keep the order of the 'case's the same as in videodev2.h! */
651 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
652 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
653 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
654 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
655 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
656 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
657 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
658 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
659 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
660 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
661 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
662 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
663 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
664 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
665 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
666 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
667 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
668 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
669 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
670 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
671 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
672 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
673 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
674 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
675 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
676 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
677 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
678 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
679 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
680 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
681 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
682 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
683 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
684 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
685 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
686 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
687 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
688 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
689 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
690 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
691 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
692 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
693 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
694 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
695 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
696 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
697 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
698 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
699 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
700 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
701 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
702 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
703 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
704 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
705 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
706 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
707 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
708 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
709 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
710 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
711 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
712 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
713 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
714 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
715 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
716 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
717 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
718 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
719 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
720 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
721 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
722 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
723 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
724 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
725 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
726 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
727 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
728 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
729 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
730 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
731 return "H264 Set QP Value for HC Layers";
732 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
733 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
734 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
735 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
736 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
737 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
738 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
739 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
740 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
741 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
742 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
743 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
744 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
745 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
746 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
747 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
748 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
749 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
750
751 /* VPX controls */
752 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
753 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
754 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
755 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
756 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
757 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
758 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
759 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
760 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
761 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
762 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
763 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
764
765 /* CAMERA controls */
766 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
767 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
768 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
769 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
770 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
771 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
772 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
773 case V4L2_CID_PAN_RESET: return "Pan, Reset";
774 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
775 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
776 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
777 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
778 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
779 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
780 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
781 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
782 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
783 case V4L2_CID_PRIVACY: return "Privacy";
784 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
785 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
786 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
787 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
788 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
789 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
790 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
791 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
792 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
793 case V4L2_CID_SCENE_MODE: return "Scene Mode";
794 case V4L2_CID_3A_LOCK: return "3A Lock";
795 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
796 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
797 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
798 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
799 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
800 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
801
802 /* FM Radio Modulator controls */
803 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
804 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
805 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
806 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
807 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
808 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
809 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
810 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
811 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
812 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
813 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
814 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
815 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
816 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
817 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
818 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
819 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
820 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
821 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
822 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
823 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
824 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
825 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
826 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
827 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
828 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
829 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
830 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
831 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
832 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
833
834 /* Flash controls */
835 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
836 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
837 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
838 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
839 case V4L2_CID_FLASH_STROBE: return "Strobe";
840 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
841 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
842 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
843 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
844 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
845 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
846 case V4L2_CID_FLASH_FAULT: return "Faults";
847 case V4L2_CID_FLASH_CHARGE: return "Charge";
848 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
849
850 /* JPEG encoder controls */
851 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
852 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
853 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
854 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
855 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
856 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
857
858 /* Image source controls */
859 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
860 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
861 case V4L2_CID_VBLANK: return "Vertical Blanking";
862 case V4L2_CID_HBLANK: return "Horizontal Blanking";
863 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
864 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
865 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
866 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
867 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
868
869 /* Image processing controls */
870 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
871 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
872 case V4L2_CID_LINK_FREQ: return "Link Frequency";
873 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
874 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
875
876 /* DV controls */
877 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
878 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
879 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
880 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
881 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
882 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
883 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
884 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
885 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
886
887 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
888 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
889 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
890 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
891 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
892 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
893 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
894 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
895 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
896 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
897 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
898 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
899 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
900 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
901 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
902 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
903 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
904 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
905 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
906 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
907
908 /* Detection controls */
909 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
910 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
911 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
912 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
913 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
914 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
915 default:
916 return NULL;
917 }
918 }
919 EXPORT_SYMBOL(v4l2_ctrl_get_name);
920
921 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
922 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
923 {
924 *name = v4l2_ctrl_get_name(id);
925 *flags = 0;
926
927 switch (id) {
928 case V4L2_CID_AUDIO_MUTE:
929 case V4L2_CID_AUDIO_LOUDNESS:
930 case V4L2_CID_AUTO_WHITE_BALANCE:
931 case V4L2_CID_AUTOGAIN:
932 case V4L2_CID_HFLIP:
933 case V4L2_CID_VFLIP:
934 case V4L2_CID_HUE_AUTO:
935 case V4L2_CID_CHROMA_AGC:
936 case V4L2_CID_COLOR_KILLER:
937 case V4L2_CID_AUTOBRIGHTNESS:
938 case V4L2_CID_MPEG_AUDIO_MUTE:
939 case V4L2_CID_MPEG_VIDEO_MUTE:
940 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
941 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
942 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
943 case V4L2_CID_FOCUS_AUTO:
944 case V4L2_CID_PRIVACY:
945 case V4L2_CID_AUDIO_LIMITER_ENABLED:
946 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
947 case V4L2_CID_PILOT_TONE_ENABLED:
948 case V4L2_CID_ILLUMINATORS_1:
949 case V4L2_CID_ILLUMINATORS_2:
950 case V4L2_CID_FLASH_STROBE_STATUS:
951 case V4L2_CID_FLASH_CHARGE:
952 case V4L2_CID_FLASH_READY:
953 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
954 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
955 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
956 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
957 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
958 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
959 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
960 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
961 case V4L2_CID_WIDE_DYNAMIC_RANGE:
962 case V4L2_CID_IMAGE_STABILIZATION:
963 case V4L2_CID_RDS_RECEPTION:
964 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
965 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
966 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
967 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
968 case V4L2_CID_RF_TUNER_PLL_LOCK:
969 case V4L2_CID_RDS_TX_MONO_STEREO:
970 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
971 case V4L2_CID_RDS_TX_COMPRESSED:
972 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
973 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
974 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
975 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
976 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
977 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
978 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
979 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
980 *type = V4L2_CTRL_TYPE_BOOLEAN;
981 *min = 0;
982 *max = *step = 1;
983 break;
984 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
985 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
986 *type = V4L2_CTRL_TYPE_INTEGER;
987 break;
988 case V4L2_CID_PAN_RESET:
989 case V4L2_CID_TILT_RESET:
990 case V4L2_CID_FLASH_STROBE:
991 case V4L2_CID_FLASH_STROBE_STOP:
992 case V4L2_CID_AUTO_FOCUS_START:
993 case V4L2_CID_AUTO_FOCUS_STOP:
994 *type = V4L2_CTRL_TYPE_BUTTON;
995 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
996 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
997 *min = *max = *step = *def = 0;
998 break;
999 case V4L2_CID_POWER_LINE_FREQUENCY:
1000 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1001 case V4L2_CID_MPEG_AUDIO_ENCODING:
1002 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1003 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1004 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1005 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1006 case V4L2_CID_MPEG_AUDIO_MODE:
1007 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1008 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1009 case V4L2_CID_MPEG_AUDIO_CRC:
1010 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1011 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1012 case V4L2_CID_MPEG_VIDEO_ENCODING:
1013 case V4L2_CID_MPEG_VIDEO_ASPECT:
1014 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1015 case V4L2_CID_MPEG_STREAM_TYPE:
1016 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1017 case V4L2_CID_EXPOSURE_AUTO:
1018 case V4L2_CID_AUTO_FOCUS_RANGE:
1019 case V4L2_CID_COLORFX:
1020 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1021 case V4L2_CID_TUNE_PREEMPHASIS:
1022 case V4L2_CID_FLASH_LED_MODE:
1023 case V4L2_CID_FLASH_STROBE_SOURCE:
1024 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1025 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1026 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1027 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1028 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1029 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1030 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1031 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1032 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1033 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1034 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1035 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1036 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1037 case V4L2_CID_EXPOSURE_METERING:
1038 case V4L2_CID_SCENE_MODE:
1039 case V4L2_CID_DV_TX_MODE:
1040 case V4L2_CID_DV_TX_RGB_RANGE:
1041 case V4L2_CID_DV_RX_RGB_RANGE:
1042 case V4L2_CID_TEST_PATTERN:
1043 case V4L2_CID_TUNE_DEEMPHASIS:
1044 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1045 case V4L2_CID_DETECT_MD_MODE:
1046 *type = V4L2_CTRL_TYPE_MENU;
1047 break;
1048 case V4L2_CID_LINK_FREQ:
1049 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1050 break;
1051 case V4L2_CID_RDS_TX_PS_NAME:
1052 case V4L2_CID_RDS_TX_RADIO_TEXT:
1053 case V4L2_CID_RDS_RX_PS_NAME:
1054 case V4L2_CID_RDS_RX_RADIO_TEXT:
1055 *type = V4L2_CTRL_TYPE_STRING;
1056 break;
1057 case V4L2_CID_ISO_SENSITIVITY:
1058 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1059 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1060 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1061 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1062 break;
1063 case V4L2_CID_USER_CLASS:
1064 case V4L2_CID_CAMERA_CLASS:
1065 case V4L2_CID_MPEG_CLASS:
1066 case V4L2_CID_FM_TX_CLASS:
1067 case V4L2_CID_FLASH_CLASS:
1068 case V4L2_CID_JPEG_CLASS:
1069 case V4L2_CID_IMAGE_SOURCE_CLASS:
1070 case V4L2_CID_IMAGE_PROC_CLASS:
1071 case V4L2_CID_DV_CLASS:
1072 case V4L2_CID_FM_RX_CLASS:
1073 case V4L2_CID_RF_TUNER_CLASS:
1074 case V4L2_CID_DETECT_CLASS:
1075 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1076 /* You can neither read not write these */
1077 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1078 *min = *max = *step = *def = 0;
1079 break;
1080 case V4L2_CID_BG_COLOR:
1081 *type = V4L2_CTRL_TYPE_INTEGER;
1082 *step = 1;
1083 *min = 0;
1084 /* Max is calculated as RGB888 that is 2^24 */
1085 *max = 0xFFFFFF;
1086 break;
1087 case V4L2_CID_FLASH_FAULT:
1088 case V4L2_CID_JPEG_ACTIVE_MARKER:
1089 case V4L2_CID_3A_LOCK:
1090 case V4L2_CID_AUTO_FOCUS_STATUS:
1091 case V4L2_CID_DV_TX_HOTPLUG:
1092 case V4L2_CID_DV_TX_RXSENSE:
1093 case V4L2_CID_DV_TX_EDID_PRESENT:
1094 case V4L2_CID_DV_RX_POWER_PRESENT:
1095 *type = V4L2_CTRL_TYPE_BITMASK;
1096 break;
1097 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1098 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1099 *type = V4L2_CTRL_TYPE_INTEGER;
1100 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1101 break;
1102 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1103 *type = V4L2_CTRL_TYPE_INTEGER64;
1104 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1105 *min = *def = 0;
1106 *max = 0x1ffffffffLL;
1107 *step = 1;
1108 break;
1109 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1110 *type = V4L2_CTRL_TYPE_INTEGER64;
1111 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1112 *min = *def = 0;
1113 *max = 0x7fffffffffffffffLL;
1114 *step = 1;
1115 break;
1116 case V4L2_CID_PIXEL_RATE:
1117 *type = V4L2_CTRL_TYPE_INTEGER64;
1118 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1119 break;
1120 case V4L2_CID_DETECT_MD_REGION_GRID:
1121 *type = V4L2_CTRL_TYPE_U8;
1122 break;
1123 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1124 *type = V4L2_CTRL_TYPE_U16;
1125 break;
1126 case V4L2_CID_RDS_TX_ALT_FREQS:
1127 *type = V4L2_CTRL_TYPE_U32;
1128 break;
1129 default:
1130 *type = V4L2_CTRL_TYPE_INTEGER;
1131 break;
1132 }
1133 switch (id) {
1134 case V4L2_CID_MPEG_AUDIO_ENCODING:
1135 case V4L2_CID_MPEG_AUDIO_MODE:
1136 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1137 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1138 case V4L2_CID_MPEG_STREAM_TYPE:
1139 *flags |= V4L2_CTRL_FLAG_UPDATE;
1140 break;
1141 case V4L2_CID_AUDIO_VOLUME:
1142 case V4L2_CID_AUDIO_BALANCE:
1143 case V4L2_CID_AUDIO_BASS:
1144 case V4L2_CID_AUDIO_TREBLE:
1145 case V4L2_CID_BRIGHTNESS:
1146 case V4L2_CID_CONTRAST:
1147 case V4L2_CID_SATURATION:
1148 case V4L2_CID_HUE:
1149 case V4L2_CID_RED_BALANCE:
1150 case V4L2_CID_BLUE_BALANCE:
1151 case V4L2_CID_GAMMA:
1152 case V4L2_CID_SHARPNESS:
1153 case V4L2_CID_CHROMA_GAIN:
1154 case V4L2_CID_RDS_TX_DEVIATION:
1155 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1156 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1157 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1158 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1159 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1160 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1161 case V4L2_CID_PILOT_TONE_DEVIATION:
1162 case V4L2_CID_PILOT_TONE_FREQUENCY:
1163 case V4L2_CID_TUNE_POWER_LEVEL:
1164 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1165 case V4L2_CID_RF_TUNER_RF_GAIN:
1166 case V4L2_CID_RF_TUNER_LNA_GAIN:
1167 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1168 case V4L2_CID_RF_TUNER_IF_GAIN:
1169 case V4L2_CID_RF_TUNER_BANDWIDTH:
1170 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1171 *flags |= V4L2_CTRL_FLAG_SLIDER;
1172 break;
1173 case V4L2_CID_PAN_RELATIVE:
1174 case V4L2_CID_TILT_RELATIVE:
1175 case V4L2_CID_FOCUS_RELATIVE:
1176 case V4L2_CID_IRIS_RELATIVE:
1177 case V4L2_CID_ZOOM_RELATIVE:
1178 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1179 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1180 break;
1181 case V4L2_CID_FLASH_STROBE_STATUS:
1182 case V4L2_CID_AUTO_FOCUS_STATUS:
1183 case V4L2_CID_FLASH_READY:
1184 case V4L2_CID_DV_TX_HOTPLUG:
1185 case V4L2_CID_DV_TX_RXSENSE:
1186 case V4L2_CID_DV_TX_EDID_PRESENT:
1187 case V4L2_CID_DV_RX_POWER_PRESENT:
1188 case V4L2_CID_RDS_RX_PTY:
1189 case V4L2_CID_RDS_RX_PS_NAME:
1190 case V4L2_CID_RDS_RX_RADIO_TEXT:
1191 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1192 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1193 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1194 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1195 break;
1196 case V4L2_CID_RF_TUNER_PLL_LOCK:
1197 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1198 break;
1199 }
1200 }
1201 EXPORT_SYMBOL(v4l2_ctrl_fill);
1202
1203 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1204 {
1205 u32 flags = ctrl->flags;
1206
1207 if (ctrl->is_ptr)
1208 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1209
1210 return flags;
1211 }
1212
1213 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1214 {
1215 memset(ev->reserved, 0, sizeof(ev->reserved));
1216 ev->type = V4L2_EVENT_CTRL;
1217 ev->id = ctrl->id;
1218 ev->u.ctrl.changes = changes;
1219 ev->u.ctrl.type = ctrl->type;
1220 ev->u.ctrl.flags = user_flags(ctrl);
1221 if (ctrl->is_ptr)
1222 ev->u.ctrl.value64 = 0;
1223 else
1224 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1225 ev->u.ctrl.minimum = ctrl->minimum;
1226 ev->u.ctrl.maximum = ctrl->maximum;
1227 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1228 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1229 ev->u.ctrl.step = 1;
1230 else
1231 ev->u.ctrl.step = ctrl->step;
1232 ev->u.ctrl.default_value = ctrl->default_value;
1233 }
1234
1235 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1236 {
1237 struct v4l2_event ev;
1238 struct v4l2_subscribed_event *sev;
1239
1240 if (list_empty(&ctrl->ev_subs))
1241 return;
1242 fill_event(&ev, ctrl, changes);
1243
1244 list_for_each_entry(sev, &ctrl->ev_subs, node)
1245 if (sev->fh != fh ||
1246 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1247 v4l2_event_queue_fh(sev->fh, &ev);
1248 }
1249
1250 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1251 union v4l2_ctrl_ptr ptr1,
1252 union v4l2_ctrl_ptr ptr2)
1253 {
1254 switch (ctrl->type) {
1255 case V4L2_CTRL_TYPE_BUTTON:
1256 return false;
1257 case V4L2_CTRL_TYPE_STRING:
1258 idx *= ctrl->elem_size;
1259 /* strings are always 0-terminated */
1260 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1261 case V4L2_CTRL_TYPE_INTEGER64:
1262 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1263 case V4L2_CTRL_TYPE_U8:
1264 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1265 case V4L2_CTRL_TYPE_U16:
1266 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1267 case V4L2_CTRL_TYPE_U32:
1268 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1269 default:
1270 if (ctrl->is_int)
1271 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1272 idx *= ctrl->elem_size;
1273 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1274 }
1275 }
1276
1277 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1278 union v4l2_ctrl_ptr ptr)
1279 {
1280 switch (ctrl->type) {
1281 case V4L2_CTRL_TYPE_STRING:
1282 idx *= ctrl->elem_size;
1283 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1284 ptr.p_char[idx + ctrl->minimum] = '\0';
1285 break;
1286 case V4L2_CTRL_TYPE_INTEGER64:
1287 ptr.p_s64[idx] = ctrl->default_value;
1288 break;
1289 case V4L2_CTRL_TYPE_INTEGER:
1290 case V4L2_CTRL_TYPE_INTEGER_MENU:
1291 case V4L2_CTRL_TYPE_MENU:
1292 case V4L2_CTRL_TYPE_BITMASK:
1293 case V4L2_CTRL_TYPE_BOOLEAN:
1294 ptr.p_s32[idx] = ctrl->default_value;
1295 break;
1296 case V4L2_CTRL_TYPE_U8:
1297 ptr.p_u8[idx] = ctrl->default_value;
1298 break;
1299 case V4L2_CTRL_TYPE_U16:
1300 ptr.p_u16[idx] = ctrl->default_value;
1301 break;
1302 case V4L2_CTRL_TYPE_U32:
1303 ptr.p_u32[idx] = ctrl->default_value;
1304 break;
1305 default:
1306 idx *= ctrl->elem_size;
1307 memset(ptr.p + idx, 0, ctrl->elem_size);
1308 break;
1309 }
1310 }
1311
1312 static void std_log(const struct v4l2_ctrl *ctrl)
1313 {
1314 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1315
1316 if (ctrl->is_array) {
1317 unsigned i;
1318
1319 for (i = 0; i < ctrl->nr_of_dims; i++)
1320 pr_cont("[%u]", ctrl->dims[i]);
1321 pr_cont(" ");
1322 }
1323
1324 switch (ctrl->type) {
1325 case V4L2_CTRL_TYPE_INTEGER:
1326 pr_cont("%d", *ptr.p_s32);
1327 break;
1328 case V4L2_CTRL_TYPE_BOOLEAN:
1329 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1330 break;
1331 case V4L2_CTRL_TYPE_MENU:
1332 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1333 break;
1334 case V4L2_CTRL_TYPE_INTEGER_MENU:
1335 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1336 break;
1337 case V4L2_CTRL_TYPE_BITMASK:
1338 pr_cont("0x%08x", *ptr.p_s32);
1339 break;
1340 case V4L2_CTRL_TYPE_INTEGER64:
1341 pr_cont("%lld", *ptr.p_s64);
1342 break;
1343 case V4L2_CTRL_TYPE_STRING:
1344 pr_cont("%s", ptr.p_char);
1345 break;
1346 case V4L2_CTRL_TYPE_U8:
1347 pr_cont("%u", (unsigned)*ptr.p_u8);
1348 break;
1349 case V4L2_CTRL_TYPE_U16:
1350 pr_cont("%u", (unsigned)*ptr.p_u16);
1351 break;
1352 case V4L2_CTRL_TYPE_U32:
1353 pr_cont("%u", (unsigned)*ptr.p_u32);
1354 break;
1355 default:
1356 pr_cont("unknown type %d", ctrl->type);
1357 break;
1358 }
1359 }
1360
1361 /*
1362 * Round towards the closest legal value. Be careful when we are
1363 * close to the maximum range of the control type to prevent
1364 * wrap-arounds.
1365 */
1366 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1367 ({ \
1368 offset_type offset; \
1369 if ((ctrl)->maximum >= 0 && \
1370 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1371 val = (ctrl)->maximum; \
1372 else \
1373 val += (s32)((ctrl)->step / 2); \
1374 val = clamp_t(typeof(val), val, \
1375 (ctrl)->minimum, (ctrl)->maximum); \
1376 offset = (val) - (ctrl)->minimum; \
1377 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1378 val = (ctrl)->minimum + offset; \
1379 0; \
1380 })
1381
1382 /* Validate a new control */
1383 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1384 union v4l2_ctrl_ptr ptr)
1385 {
1386 size_t len;
1387 u64 offset;
1388 s64 val;
1389
1390 switch (ctrl->type) {
1391 case V4L2_CTRL_TYPE_INTEGER:
1392 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1393 case V4L2_CTRL_TYPE_INTEGER64:
1394 /*
1395 * We can't use the ROUND_TO_RANGE define here due to
1396 * the u64 divide that needs special care.
1397 */
1398 val = ptr.p_s64[idx];
1399 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1400 val = ctrl->maximum;
1401 else
1402 val += (s64)(ctrl->step / 2);
1403 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1404 offset = val - ctrl->minimum;
1405 do_div(offset, ctrl->step);
1406 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1407 return 0;
1408 case V4L2_CTRL_TYPE_U8:
1409 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1410 case V4L2_CTRL_TYPE_U16:
1411 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1412 case V4L2_CTRL_TYPE_U32:
1413 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1414
1415 case V4L2_CTRL_TYPE_BOOLEAN:
1416 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1417 return 0;
1418
1419 case V4L2_CTRL_TYPE_MENU:
1420 case V4L2_CTRL_TYPE_INTEGER_MENU:
1421 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1422 return -ERANGE;
1423 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1424 return -EINVAL;
1425 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1426 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1427 return -EINVAL;
1428 return 0;
1429
1430 case V4L2_CTRL_TYPE_BITMASK:
1431 ptr.p_s32[idx] &= ctrl->maximum;
1432 return 0;
1433
1434 case V4L2_CTRL_TYPE_BUTTON:
1435 case V4L2_CTRL_TYPE_CTRL_CLASS:
1436 ptr.p_s32[idx] = 0;
1437 return 0;
1438
1439 case V4L2_CTRL_TYPE_STRING:
1440 idx *= ctrl->elem_size;
1441 len = strlen(ptr.p_char + idx);
1442 if (len < ctrl->minimum)
1443 return -ERANGE;
1444 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1445 return -ERANGE;
1446 return 0;
1447
1448 default:
1449 return -EINVAL;
1450 }
1451 }
1452
1453 static const struct v4l2_ctrl_type_ops std_type_ops = {
1454 .equal = std_equal,
1455 .init = std_init,
1456 .log = std_log,
1457 .validate = std_validate,
1458 };
1459
1460 /* Helper function: copy the given control value back to the caller */
1461 static int ptr_to_user(struct v4l2_ext_control *c,
1462 struct v4l2_ctrl *ctrl,
1463 union v4l2_ctrl_ptr ptr)
1464 {
1465 u32 len;
1466
1467 if (ctrl->is_ptr && !ctrl->is_string)
1468 return copy_to_user(c->ptr, ptr.p, c->size) ?
1469 -EFAULT : 0;
1470
1471 switch (ctrl->type) {
1472 case V4L2_CTRL_TYPE_STRING:
1473 len = strlen(ptr.p_char);
1474 if (c->size < len + 1) {
1475 c->size = ctrl->elem_size;
1476 return -ENOSPC;
1477 }
1478 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1479 -EFAULT : 0;
1480 case V4L2_CTRL_TYPE_INTEGER64:
1481 c->value64 = *ptr.p_s64;
1482 break;
1483 default:
1484 c->value = *ptr.p_s32;
1485 break;
1486 }
1487 return 0;
1488 }
1489
1490 /* Helper function: copy the current control value back to the caller */
1491 static int cur_to_user(struct v4l2_ext_control *c,
1492 struct v4l2_ctrl *ctrl)
1493 {
1494 return ptr_to_user(c, ctrl, ctrl->p_cur);
1495 }
1496
1497 /* Helper function: copy the new control value back to the caller */
1498 static int new_to_user(struct v4l2_ext_control *c,
1499 struct v4l2_ctrl *ctrl)
1500 {
1501 return ptr_to_user(c, ctrl, ctrl->p_new);
1502 }
1503
1504 /* Helper function: copy the caller-provider value to the given control value */
1505 static int user_to_ptr(struct v4l2_ext_control *c,
1506 struct v4l2_ctrl *ctrl,
1507 union v4l2_ctrl_ptr ptr)
1508 {
1509 int ret;
1510 u32 size;
1511
1512 ctrl->is_new = 1;
1513 if (ctrl->is_ptr && !ctrl->is_string) {
1514 unsigned idx;
1515
1516 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1517 if (ret || !ctrl->is_array)
1518 return ret;
1519 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1520 ctrl->type_ops->init(ctrl, idx, ptr);
1521 return 0;
1522 }
1523
1524 switch (ctrl->type) {
1525 case V4L2_CTRL_TYPE_INTEGER64:
1526 *ptr.p_s64 = c->value64;
1527 break;
1528 case V4L2_CTRL_TYPE_STRING:
1529 size = c->size;
1530 if (size == 0)
1531 return -ERANGE;
1532 if (size > ctrl->maximum + 1)
1533 size = ctrl->maximum + 1;
1534 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1535 if (!ret) {
1536 char last = ptr.p_char[size - 1];
1537
1538 ptr.p_char[size - 1] = 0;
1539 /* If the string was longer than ctrl->maximum,
1540 then return an error. */
1541 if (strlen(ptr.p_char) == ctrl->maximum && last)
1542 return -ERANGE;
1543 }
1544 return ret;
1545 default:
1546 *ptr.p_s32 = c->value;
1547 break;
1548 }
1549 return 0;
1550 }
1551
1552 /* Helper function: copy the caller-provider value as the new control value */
1553 static int user_to_new(struct v4l2_ext_control *c,
1554 struct v4l2_ctrl *ctrl)
1555 {
1556 return user_to_ptr(c, ctrl, ctrl->p_new);
1557 }
1558
1559 /* Copy the one value to another. */
1560 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1561 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1562 {
1563 if (ctrl == NULL)
1564 return;
1565 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1566 }
1567
1568 /* Copy the new value to the current value. */
1569 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1570 {
1571 bool changed;
1572
1573 if (ctrl == NULL)
1574 return;
1575
1576 /* has_changed is set by cluster_changed */
1577 changed = ctrl->has_changed;
1578 if (changed)
1579 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1580
1581 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1582 /* Note: CH_FLAGS is only set for auto clusters. */
1583 ctrl->flags &=
1584 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1585 if (!is_cur_manual(ctrl->cluster[0])) {
1586 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1587 if (ctrl->cluster[0]->has_volatiles)
1588 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1589 }
1590 fh = NULL;
1591 }
1592 if (changed || ch_flags) {
1593 /* If a control was changed that was not one of the controls
1594 modified by the application, then send the event to all. */
1595 if (!ctrl->is_new)
1596 fh = NULL;
1597 send_event(fh, ctrl,
1598 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1599 if (ctrl->call_notify && changed && ctrl->handler->notify)
1600 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1601 }
1602 }
1603
1604 /* Copy the current value to the new value */
1605 static void cur_to_new(struct v4l2_ctrl *ctrl)
1606 {
1607 if (ctrl == NULL)
1608 return;
1609 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1610 }
1611
1612 /* Return non-zero if one or more of the controls in the cluster has a new
1613 value that differs from the current value. */
1614 static int cluster_changed(struct v4l2_ctrl *master)
1615 {
1616 bool changed = false;
1617 unsigned idx;
1618 int i;
1619
1620 for (i = 0; i < master->ncontrols; i++) {
1621 struct v4l2_ctrl *ctrl = master->cluster[i];
1622 bool ctrl_changed = false;
1623
1624 if (ctrl == NULL)
1625 continue;
1626
1627 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1628 changed = ctrl_changed = true;
1629
1630 /*
1631 * Set has_changed to false to avoid generating
1632 * the event V4L2_EVENT_CTRL_CH_VALUE
1633 */
1634 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1635 ctrl->has_changed = false;
1636 continue;
1637 }
1638
1639 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1640 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1641 ctrl->p_cur, ctrl->p_new);
1642 ctrl->has_changed = ctrl_changed;
1643 changed |= ctrl->has_changed;
1644 }
1645 return changed;
1646 }
1647
1648 /* Control range checking */
1649 static int check_range(enum v4l2_ctrl_type type,
1650 s64 min, s64 max, u64 step, s64 def)
1651 {
1652 switch (type) {
1653 case V4L2_CTRL_TYPE_BOOLEAN:
1654 if (step != 1 || max > 1 || min < 0)
1655 return -ERANGE;
1656 /* fall through */
1657 case V4L2_CTRL_TYPE_U8:
1658 case V4L2_CTRL_TYPE_U16:
1659 case V4L2_CTRL_TYPE_U32:
1660 case V4L2_CTRL_TYPE_INTEGER:
1661 case V4L2_CTRL_TYPE_INTEGER64:
1662 if (step == 0 || min > max || def < min || def > max)
1663 return -ERANGE;
1664 return 0;
1665 case V4L2_CTRL_TYPE_BITMASK:
1666 if (step || min || !max || (def & ~max))
1667 return -ERANGE;
1668 return 0;
1669 case V4L2_CTRL_TYPE_MENU:
1670 case V4L2_CTRL_TYPE_INTEGER_MENU:
1671 if (min > max || def < min || def > max)
1672 return -ERANGE;
1673 /* Note: step == menu_skip_mask for menu controls.
1674 So here we check if the default value is masked out. */
1675 if (step && ((1 << def) & step))
1676 return -EINVAL;
1677 return 0;
1678 case V4L2_CTRL_TYPE_STRING:
1679 if (min > max || min < 0 || step < 1 || def)
1680 return -ERANGE;
1681 return 0;
1682 default:
1683 return 0;
1684 }
1685 }
1686
1687 /* Validate a new control */
1688 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1689 {
1690 unsigned idx;
1691 int err = 0;
1692
1693 for (idx = 0; !err && idx < ctrl->elems; idx++)
1694 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1695 return err;
1696 }
1697
1698 static inline u32 node2id(struct list_head *node)
1699 {
1700 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1701 }
1702
1703 /* Set the handler's error code if it wasn't set earlier already */
1704 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1705 {
1706 if (hdl->error == 0)
1707 hdl->error = err;
1708 return err;
1709 }
1710
1711 /* Initialize the handler */
1712 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1713 unsigned nr_of_controls_hint,
1714 struct lock_class_key *key, const char *name)
1715 {
1716 hdl->lock = &hdl->_lock;
1717 mutex_init(hdl->lock);
1718 lockdep_set_class_and_name(hdl->lock, key, name);
1719 INIT_LIST_HEAD(&hdl->ctrls);
1720 INIT_LIST_HEAD(&hdl->ctrl_refs);
1721 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1722 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1723 GFP_KERNEL);
1724 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1725 return hdl->error;
1726 }
1727 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1728
1729 /* Free all controls and control refs */
1730 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1731 {
1732 struct v4l2_ctrl_ref *ref, *next_ref;
1733 struct v4l2_ctrl *ctrl, *next_ctrl;
1734 struct v4l2_subscribed_event *sev, *next_sev;
1735
1736 if (hdl == NULL || hdl->buckets == NULL)
1737 return;
1738
1739 mutex_lock(hdl->lock);
1740 /* Free all nodes */
1741 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1742 list_del(&ref->node);
1743 kfree(ref);
1744 }
1745 /* Free all controls owned by the handler */
1746 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1747 list_del(&ctrl->node);
1748 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1749 list_del(&sev->node);
1750 kfree(ctrl);
1751 }
1752 kfree(hdl->buckets);
1753 hdl->buckets = NULL;
1754 hdl->cached = NULL;
1755 hdl->error = 0;
1756 mutex_unlock(hdl->lock);
1757 }
1758 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1759
1760 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1761 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1762 with applications that do not use the NEXT_CTRL flag.
1763
1764 We just find the n-th private user control. It's O(N), but that should not
1765 be an issue in this particular case. */
1766 static struct v4l2_ctrl_ref *find_private_ref(
1767 struct v4l2_ctrl_handler *hdl, u32 id)
1768 {
1769 struct v4l2_ctrl_ref *ref;
1770
1771 id -= V4L2_CID_PRIVATE_BASE;
1772 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1773 /* Search for private user controls that are compatible with
1774 VIDIOC_G/S_CTRL. */
1775 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1776 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1777 if (!ref->ctrl->is_int)
1778 continue;
1779 if (id == 0)
1780 return ref;
1781 id--;
1782 }
1783 }
1784 return NULL;
1785 }
1786
1787 /* Find a control with the given ID. */
1788 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1789 {
1790 struct v4l2_ctrl_ref *ref;
1791 int bucket;
1792
1793 id &= V4L2_CTRL_ID_MASK;
1794
1795 /* Old-style private controls need special handling */
1796 if (id >= V4L2_CID_PRIVATE_BASE)
1797 return find_private_ref(hdl, id);
1798 bucket = id % hdl->nr_of_buckets;
1799
1800 /* Simple optimization: cache the last control found */
1801 if (hdl->cached && hdl->cached->ctrl->id == id)
1802 return hdl->cached;
1803
1804 /* Not in cache, search the hash */
1805 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1806 while (ref && ref->ctrl->id != id)
1807 ref = ref->next;
1808
1809 if (ref)
1810 hdl->cached = ref; /* cache it! */
1811 return ref;
1812 }
1813
1814 /* Find a control with the given ID. Take the handler's lock first. */
1815 static struct v4l2_ctrl_ref *find_ref_lock(
1816 struct v4l2_ctrl_handler *hdl, u32 id)
1817 {
1818 struct v4l2_ctrl_ref *ref = NULL;
1819
1820 if (hdl) {
1821 mutex_lock(hdl->lock);
1822 ref = find_ref(hdl, id);
1823 mutex_unlock(hdl->lock);
1824 }
1825 return ref;
1826 }
1827
1828 /* Find a control with the given ID. */
1829 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1830 {
1831 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1832
1833 return ref ? ref->ctrl : NULL;
1834 }
1835 EXPORT_SYMBOL(v4l2_ctrl_find);
1836
1837 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1838 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1839 struct v4l2_ctrl *ctrl)
1840 {
1841 struct v4l2_ctrl_ref *ref;
1842 struct v4l2_ctrl_ref *new_ref;
1843 u32 id = ctrl->id;
1844 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1845 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1846
1847 /*
1848 * Automatically add the control class if it is not yet present and
1849 * the new control is not a compound control.
1850 */
1851 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1852 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1853 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1854 return hdl->error;
1855
1856 if (hdl->error)
1857 return hdl->error;
1858
1859 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1860 if (!new_ref)
1861 return handler_set_err(hdl, -ENOMEM);
1862 new_ref->ctrl = ctrl;
1863 if (ctrl->handler == hdl) {
1864 /* By default each control starts in a cluster of its own.
1865 new_ref->ctrl is basically a cluster array with one
1866 element, so that's perfect to use as the cluster pointer.
1867 But only do this for the handler that owns the control. */
1868 ctrl->cluster = &new_ref->ctrl;
1869 ctrl->ncontrols = 1;
1870 }
1871
1872 INIT_LIST_HEAD(&new_ref->node);
1873
1874 mutex_lock(hdl->lock);
1875
1876 /* Add immediately at the end of the list if the list is empty, or if
1877 the last element in the list has a lower ID.
1878 This ensures that when elements are added in ascending order the
1879 insertion is an O(1) operation. */
1880 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1881 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1882 goto insert_in_hash;
1883 }
1884
1885 /* Find insert position in sorted list */
1886 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1887 if (ref->ctrl->id < id)
1888 continue;
1889 /* Don't add duplicates */
1890 if (ref->ctrl->id == id) {
1891 kfree(new_ref);
1892 goto unlock;
1893 }
1894 list_add(&new_ref->node, ref->node.prev);
1895 break;
1896 }
1897
1898 insert_in_hash:
1899 /* Insert the control node in the hash */
1900 new_ref->next = hdl->buckets[bucket];
1901 hdl->buckets[bucket] = new_ref;
1902
1903 unlock:
1904 mutex_unlock(hdl->lock);
1905 return 0;
1906 }
1907
1908 /* Add a new control */
1909 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1910 const struct v4l2_ctrl_ops *ops,
1911 const struct v4l2_ctrl_type_ops *type_ops,
1912 u32 id, const char *name, enum v4l2_ctrl_type type,
1913 s64 min, s64 max, u64 step, s64 def,
1914 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1915 u32 flags, const char * const *qmenu,
1916 const s64 *qmenu_int, void *priv)
1917 {
1918 struct v4l2_ctrl *ctrl;
1919 unsigned sz_extra;
1920 unsigned nr_of_dims = 0;
1921 unsigned elems = 1;
1922 bool is_array;
1923 unsigned tot_ctrl_size;
1924 unsigned idx;
1925 void *data;
1926 int err;
1927
1928 if (hdl->error)
1929 return NULL;
1930
1931 while (dims && dims[nr_of_dims]) {
1932 elems *= dims[nr_of_dims];
1933 nr_of_dims++;
1934 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1935 break;
1936 }
1937 is_array = nr_of_dims > 0;
1938
1939 /* Prefill elem_size for all types handled by std_type_ops */
1940 switch (type) {
1941 case V4L2_CTRL_TYPE_INTEGER64:
1942 elem_size = sizeof(s64);
1943 break;
1944 case V4L2_CTRL_TYPE_STRING:
1945 elem_size = max + 1;
1946 break;
1947 case V4L2_CTRL_TYPE_U8:
1948 elem_size = sizeof(u8);
1949 break;
1950 case V4L2_CTRL_TYPE_U16:
1951 elem_size = sizeof(u16);
1952 break;
1953 case V4L2_CTRL_TYPE_U32:
1954 elem_size = sizeof(u32);
1955 break;
1956 default:
1957 if (type < V4L2_CTRL_COMPOUND_TYPES)
1958 elem_size = sizeof(s32);
1959 break;
1960 }
1961 tot_ctrl_size = elem_size * elems;
1962
1963 /* Sanity checks */
1964 if (id == 0 || name == NULL || !elem_size ||
1965 id >= V4L2_CID_PRIVATE_BASE ||
1966 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1967 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1968 handler_set_err(hdl, -ERANGE);
1969 return NULL;
1970 }
1971 err = check_range(type, min, max, step, def);
1972 if (err) {
1973 handler_set_err(hdl, err);
1974 return NULL;
1975 }
1976 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1977 handler_set_err(hdl, -ERANGE);
1978 return NULL;
1979 }
1980 if (is_array &&
1981 (type == V4L2_CTRL_TYPE_BUTTON ||
1982 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
1983 handler_set_err(hdl, -EINVAL);
1984 return NULL;
1985 }
1986
1987 sz_extra = 0;
1988 if (type == V4L2_CTRL_TYPE_BUTTON)
1989 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1990 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1991 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1992 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1993 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
1994 type == V4L2_CTRL_TYPE_STRING ||
1995 type >= V4L2_CTRL_COMPOUND_TYPES ||
1996 is_array)
1997 sz_extra += 2 * tot_ctrl_size;
1998
1999 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2000 if (ctrl == NULL) {
2001 handler_set_err(hdl, -ENOMEM);
2002 return NULL;
2003 }
2004
2005 INIT_LIST_HEAD(&ctrl->node);
2006 INIT_LIST_HEAD(&ctrl->ev_subs);
2007 ctrl->handler = hdl;
2008 ctrl->ops = ops;
2009 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2010 ctrl->id = id;
2011 ctrl->name = name;
2012 ctrl->type = type;
2013 ctrl->flags = flags;
2014 ctrl->minimum = min;
2015 ctrl->maximum = max;
2016 ctrl->step = step;
2017 ctrl->default_value = def;
2018 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2019 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2020 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2021 ctrl->is_array = is_array;
2022 ctrl->elems = elems;
2023 ctrl->nr_of_dims = nr_of_dims;
2024 if (nr_of_dims)
2025 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2026 ctrl->elem_size = elem_size;
2027 if (type == V4L2_CTRL_TYPE_MENU)
2028 ctrl->qmenu = qmenu;
2029 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2030 ctrl->qmenu_int = qmenu_int;
2031 ctrl->priv = priv;
2032 ctrl->cur.val = ctrl->val = def;
2033 data = &ctrl[1];
2034
2035 if (!ctrl->is_int) {
2036 ctrl->p_new.p = data;
2037 ctrl->p_cur.p = data + tot_ctrl_size;
2038 } else {
2039 ctrl->p_new.p = &ctrl->val;
2040 ctrl->p_cur.p = &ctrl->cur.val;
2041 }
2042 for (idx = 0; idx < elems; idx++) {
2043 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2044 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2045 }
2046
2047 if (handler_new_ref(hdl, ctrl)) {
2048 kfree(ctrl);
2049 return NULL;
2050 }
2051 mutex_lock(hdl->lock);
2052 list_add_tail(&ctrl->node, &hdl->ctrls);
2053 mutex_unlock(hdl->lock);
2054 return ctrl;
2055 }
2056
2057 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2058 const struct v4l2_ctrl_config *cfg, void *priv)
2059 {
2060 bool is_menu;
2061 struct v4l2_ctrl *ctrl;
2062 const char *name = cfg->name;
2063 const char * const *qmenu = cfg->qmenu;
2064 const s64 *qmenu_int = cfg->qmenu_int;
2065 enum v4l2_ctrl_type type = cfg->type;
2066 u32 flags = cfg->flags;
2067 s64 min = cfg->min;
2068 s64 max = cfg->max;
2069 u64 step = cfg->step;
2070 s64 def = cfg->def;
2071
2072 if (name == NULL)
2073 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2074 &def, &flags);
2075
2076 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2077 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2078 if (is_menu)
2079 WARN_ON(step);
2080 else
2081 WARN_ON(cfg->menu_skip_mask);
2082 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2083 qmenu = v4l2_ctrl_get_menu(cfg->id);
2084 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2085 qmenu_int == NULL) {
2086 handler_set_err(hdl, -EINVAL);
2087 return NULL;
2088 }
2089
2090 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2091 type, min, max,
2092 is_menu ? cfg->menu_skip_mask : step, def,
2093 cfg->dims, cfg->elem_size,
2094 flags, qmenu, qmenu_int, priv);
2095 if (ctrl)
2096 ctrl->is_private = cfg->is_private;
2097 return ctrl;
2098 }
2099 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2100
2101 /* Helper function for standard non-menu controls */
2102 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2103 const struct v4l2_ctrl_ops *ops,
2104 u32 id, s64 min, s64 max, u64 step, s64 def)
2105 {
2106 const char *name;
2107 enum v4l2_ctrl_type type;
2108 u32 flags;
2109
2110 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2111 if (type == V4L2_CTRL_TYPE_MENU ||
2112 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2113 type >= V4L2_CTRL_COMPOUND_TYPES) {
2114 handler_set_err(hdl, -EINVAL);
2115 return NULL;
2116 }
2117 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2118 min, max, step, def, NULL, 0,
2119 flags, NULL, NULL, NULL);
2120 }
2121 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2122
2123 /* Helper function for standard menu controls */
2124 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2125 const struct v4l2_ctrl_ops *ops,
2126 u32 id, u8 _max, u64 mask, u8 _def)
2127 {
2128 const char * const *qmenu = NULL;
2129 const s64 *qmenu_int = NULL;
2130 unsigned int qmenu_int_len = 0;
2131 const char *name;
2132 enum v4l2_ctrl_type type;
2133 s64 min;
2134 s64 max = _max;
2135 s64 def = _def;
2136 u64 step;
2137 u32 flags;
2138
2139 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2140
2141 if (type == V4L2_CTRL_TYPE_MENU)
2142 qmenu = v4l2_ctrl_get_menu(id);
2143 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2144 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2145
2146 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2147 handler_set_err(hdl, -EINVAL);
2148 return NULL;
2149 }
2150 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2151 0, max, mask, def, NULL, 0,
2152 flags, qmenu, qmenu_int, NULL);
2153 }
2154 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2155
2156 /* Helper function for standard menu controls with driver defined menu */
2157 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2158 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2159 u64 mask, u8 _def, const char * const *qmenu)
2160 {
2161 enum v4l2_ctrl_type type;
2162 const char *name;
2163 u32 flags;
2164 u64 step;
2165 s64 min;
2166 s64 max = _max;
2167 s64 def = _def;
2168
2169 /* v4l2_ctrl_new_std_menu_items() should only be called for
2170 * standard controls without a standard menu.
2171 */
2172 if (v4l2_ctrl_get_menu(id)) {
2173 handler_set_err(hdl, -EINVAL);
2174 return NULL;
2175 }
2176
2177 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2178 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2179 handler_set_err(hdl, -EINVAL);
2180 return NULL;
2181 }
2182 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2183 0, max, mask, def, NULL, 0,
2184 flags, qmenu, NULL, NULL);
2185
2186 }
2187 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2188
2189 /* Helper function for standard integer menu controls */
2190 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2191 const struct v4l2_ctrl_ops *ops,
2192 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2193 {
2194 const char *name;
2195 enum v4l2_ctrl_type type;
2196 s64 min;
2197 u64 step;
2198 s64 max = _max;
2199 s64 def = _def;
2200 u32 flags;
2201
2202 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2203 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2204 handler_set_err(hdl, -EINVAL);
2205 return NULL;
2206 }
2207 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2208 0, max, 0, def, NULL, 0,
2209 flags, NULL, qmenu_int, NULL);
2210 }
2211 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2212
2213 /* Add a control from another handler to this handler */
2214 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
2215 struct v4l2_ctrl *ctrl)
2216 {
2217 if (hdl == NULL || hdl->error)
2218 return NULL;
2219 if (ctrl == NULL) {
2220 handler_set_err(hdl, -EINVAL);
2221 return NULL;
2222 }
2223 if (ctrl->handler == hdl)
2224 return ctrl;
2225 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
2226 }
2227 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
2228
2229 /* Add the controls from another handler to our own. */
2230 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2231 struct v4l2_ctrl_handler *add,
2232 bool (*filter)(const struct v4l2_ctrl *ctrl))
2233 {
2234 struct v4l2_ctrl_ref *ref;
2235 int ret = 0;
2236
2237 /* Do nothing if either handler is NULL or if they are the same */
2238 if (!hdl || !add || hdl == add)
2239 return 0;
2240 if (hdl->error)
2241 return hdl->error;
2242 mutex_lock(add->lock);
2243 list_for_each_entry(ref, &add->ctrl_refs, node) {
2244 struct v4l2_ctrl *ctrl = ref->ctrl;
2245
2246 /* Skip handler-private controls. */
2247 if (ctrl->is_private)
2248 continue;
2249 /* And control classes */
2250 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2251 continue;
2252 /* Filter any unwanted controls */
2253 if (filter && !filter(ctrl))
2254 continue;
2255 ret = handler_new_ref(hdl, ctrl);
2256 if (ret)
2257 break;
2258 }
2259 mutex_unlock(add->lock);
2260 return ret;
2261 }
2262 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2263
2264 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2265 {
2266 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2267 return true;
2268 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2269 return true;
2270 switch (ctrl->id) {
2271 case V4L2_CID_AUDIO_MUTE:
2272 case V4L2_CID_AUDIO_VOLUME:
2273 case V4L2_CID_AUDIO_BALANCE:
2274 case V4L2_CID_AUDIO_BASS:
2275 case V4L2_CID_AUDIO_TREBLE:
2276 case V4L2_CID_AUDIO_LOUDNESS:
2277 return true;
2278 default:
2279 break;
2280 }
2281 return false;
2282 }
2283 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2284
2285 /* Cluster controls */
2286 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2287 {
2288 bool has_volatiles = false;
2289 int i;
2290
2291 /* The first control is the master control and it must not be NULL */
2292 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2293 return;
2294
2295 for (i = 0; i < ncontrols; i++) {
2296 if (controls[i]) {
2297 controls[i]->cluster = controls;
2298 controls[i]->ncontrols = ncontrols;
2299 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2300 has_volatiles = true;
2301 }
2302 }
2303 controls[0]->has_volatiles = has_volatiles;
2304 }
2305 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2306
2307 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2308 u8 manual_val, bool set_volatile)
2309 {
2310 struct v4l2_ctrl *master = controls[0];
2311 u32 flag = 0;
2312 int i;
2313
2314 v4l2_ctrl_cluster(ncontrols, controls);
2315 WARN_ON(ncontrols <= 1);
2316 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2317 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2318 master->is_auto = true;
2319 master->has_volatiles = set_volatile;
2320 master->manual_mode_value = manual_val;
2321 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2322
2323 if (!is_cur_manual(master))
2324 flag = V4L2_CTRL_FLAG_INACTIVE |
2325 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2326
2327 for (i = 1; i < ncontrols; i++)
2328 if (controls[i])
2329 controls[i]->flags |= flag;
2330 }
2331 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2332
2333 /* Activate/deactivate a control. */
2334 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2335 {
2336 /* invert since the actual flag is called 'inactive' */
2337 bool inactive = !active;
2338 bool old;
2339
2340 if (ctrl == NULL)
2341 return;
2342
2343 if (inactive)
2344 /* set V4L2_CTRL_FLAG_INACTIVE */
2345 old = test_and_set_bit(4, &ctrl->flags);
2346 else
2347 /* clear V4L2_CTRL_FLAG_INACTIVE */
2348 old = test_and_clear_bit(4, &ctrl->flags);
2349 if (old != inactive)
2350 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2351 }
2352 EXPORT_SYMBOL(v4l2_ctrl_activate);
2353
2354 /* Grab/ungrab a control.
2355 Typically used when streaming starts and you want to grab controls,
2356 preventing the user from changing them.
2357
2358 Just call this and the framework will block any attempts to change
2359 these controls. */
2360 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2361 {
2362 bool old;
2363
2364 if (ctrl == NULL)
2365 return;
2366
2367 v4l2_ctrl_lock(ctrl);
2368 if (grabbed)
2369 /* set V4L2_CTRL_FLAG_GRABBED */
2370 old = test_and_set_bit(1, &ctrl->flags);
2371 else
2372 /* clear V4L2_CTRL_FLAG_GRABBED */
2373 old = test_and_clear_bit(1, &ctrl->flags);
2374 if (old != grabbed)
2375 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2376 v4l2_ctrl_unlock(ctrl);
2377 }
2378 EXPORT_SYMBOL(v4l2_ctrl_grab);
2379
2380 /* Log the control name and value */
2381 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2382 const char *prefix, const char *colon)
2383 {
2384 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2385 return;
2386 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2387 return;
2388
2389 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2390
2391 ctrl->type_ops->log(ctrl);
2392
2393 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2394 V4L2_CTRL_FLAG_GRABBED |
2395 V4L2_CTRL_FLAG_VOLATILE)) {
2396 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2397 pr_cont(" inactive");
2398 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2399 pr_cont(" grabbed");
2400 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2401 pr_cont(" volatile");
2402 }
2403 pr_cont("\n");
2404 }
2405
2406 /* Log all controls owned by the handler */
2407 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2408 const char *prefix)
2409 {
2410 struct v4l2_ctrl *ctrl;
2411 const char *colon = "";
2412 int len;
2413
2414 if (hdl == NULL)
2415 return;
2416 if (prefix == NULL)
2417 prefix = "";
2418 len = strlen(prefix);
2419 if (len && prefix[len - 1] != ' ')
2420 colon = ": ";
2421 mutex_lock(hdl->lock);
2422 list_for_each_entry(ctrl, &hdl->ctrls, node)
2423 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2424 log_ctrl(ctrl, prefix, colon);
2425 mutex_unlock(hdl->lock);
2426 }
2427 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2428
2429 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2430 {
2431 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2432 return 0;
2433 }
2434 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2435
2436 /* Call s_ctrl for all controls owned by the handler */
2437 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2438 {
2439 struct v4l2_ctrl *ctrl;
2440 int ret = 0;
2441
2442 if (hdl == NULL)
2443 return 0;
2444 mutex_lock(hdl->lock);
2445 list_for_each_entry(ctrl, &hdl->ctrls, node)
2446 ctrl->done = false;
2447
2448 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2449 struct v4l2_ctrl *master = ctrl->cluster[0];
2450 int i;
2451
2452 /* Skip if this control was already handled by a cluster. */
2453 /* Skip button controls and read-only controls. */
2454 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2455 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2456 continue;
2457
2458 for (i = 0; i < master->ncontrols; i++) {
2459 if (master->cluster[i]) {
2460 cur_to_new(master->cluster[i]);
2461 master->cluster[i]->is_new = 1;
2462 master->cluster[i]->done = true;
2463 }
2464 }
2465 ret = call_op(master, s_ctrl);
2466 if (ret)
2467 break;
2468 }
2469 mutex_unlock(hdl->lock);
2470 return ret;
2471 }
2472 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2473
2474 /* Implement VIDIOC_QUERY_EXT_CTRL */
2475 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2476 {
2477 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2478 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2479 struct v4l2_ctrl_ref *ref;
2480 struct v4l2_ctrl *ctrl;
2481
2482 if (hdl == NULL)
2483 return -EINVAL;
2484
2485 mutex_lock(hdl->lock);
2486
2487 /* Try to find it */
2488 ref = find_ref(hdl, id);
2489
2490 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2491 bool is_compound;
2492 /* Match any control that is not hidden */
2493 unsigned mask = 1;
2494 bool match = false;
2495
2496 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2497 /* Match any hidden control */
2498 match = true;
2499 } else if ((qc->id & next_flags) == next_flags) {
2500 /* Match any control, compound or not */
2501 mask = 0;
2502 }
2503
2504 /* Find the next control with ID > qc->id */
2505
2506 /* Did we reach the end of the control list? */
2507 if (id >= node2id(hdl->ctrl_refs.prev)) {
2508 ref = NULL; /* Yes, so there is no next control */
2509 } else if (ref) {
2510 /* We found a control with the given ID, so just get
2511 the next valid one in the list. */
2512 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2513 is_compound = ref->ctrl->is_array ||
2514 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2515 if (id < ref->ctrl->id &&
2516 (is_compound & mask) == match)
2517 break;
2518 }
2519 if (&ref->node == &hdl->ctrl_refs)
2520 ref = NULL;
2521 } else {
2522 /* No control with the given ID exists, so start
2523 searching for the next largest ID. We know there
2524 is one, otherwise the first 'if' above would have
2525 been true. */
2526 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2527 is_compound = ref->ctrl->is_array ||
2528 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2529 if (id < ref->ctrl->id &&
2530 (is_compound & mask) == match)
2531 break;
2532 }
2533 if (&ref->node == &hdl->ctrl_refs)
2534 ref = NULL;
2535 }
2536 }
2537 mutex_unlock(hdl->lock);
2538
2539 if (!ref)
2540 return -EINVAL;
2541
2542 ctrl = ref->ctrl;
2543 memset(qc, 0, sizeof(*qc));
2544 if (id >= V4L2_CID_PRIVATE_BASE)
2545 qc->id = id;
2546 else
2547 qc->id = ctrl->id;
2548 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2549 qc->flags = user_flags(ctrl);
2550 qc->type = ctrl->type;
2551 qc->elem_size = ctrl->elem_size;
2552 qc->elems = ctrl->elems;
2553 qc->nr_of_dims = ctrl->nr_of_dims;
2554 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2555 qc->minimum = ctrl->minimum;
2556 qc->maximum = ctrl->maximum;
2557 qc->default_value = ctrl->default_value;
2558 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2559 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2560 qc->step = 1;
2561 else
2562 qc->step = ctrl->step;
2563 return 0;
2564 }
2565 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2566
2567 /* Implement VIDIOC_QUERYCTRL */
2568 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2569 {
2570 struct v4l2_query_ext_ctrl qec = { qc->id };
2571 int rc;
2572
2573 rc = v4l2_query_ext_ctrl(hdl, &qec);
2574 if (rc)
2575 return rc;
2576
2577 qc->id = qec.id;
2578 qc->type = qec.type;
2579 qc->flags = qec.flags;
2580 strlcpy(qc->name, qec.name, sizeof(qc->name));
2581 switch (qc->type) {
2582 case V4L2_CTRL_TYPE_INTEGER:
2583 case V4L2_CTRL_TYPE_BOOLEAN:
2584 case V4L2_CTRL_TYPE_MENU:
2585 case V4L2_CTRL_TYPE_INTEGER_MENU:
2586 case V4L2_CTRL_TYPE_STRING:
2587 case V4L2_CTRL_TYPE_BITMASK:
2588 qc->minimum = qec.minimum;
2589 qc->maximum = qec.maximum;
2590 qc->step = qec.step;
2591 qc->default_value = qec.default_value;
2592 break;
2593 default:
2594 qc->minimum = 0;
2595 qc->maximum = 0;
2596 qc->step = 0;
2597 qc->default_value = 0;
2598 break;
2599 }
2600 return 0;
2601 }
2602 EXPORT_SYMBOL(v4l2_queryctrl);
2603
2604 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2605 {
2606 if (qc->id & (V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND))
2607 return -EINVAL;
2608 return v4l2_queryctrl(sd->ctrl_handler, qc);
2609 }
2610 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2611
2612 /* Implement VIDIOC_QUERYMENU */
2613 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2614 {
2615 struct v4l2_ctrl *ctrl;
2616 u32 i = qm->index;
2617
2618 ctrl = v4l2_ctrl_find(hdl, qm->id);
2619 if (!ctrl)
2620 return -EINVAL;
2621
2622 qm->reserved = 0;
2623 /* Sanity checks */
2624 switch (ctrl->type) {
2625 case V4L2_CTRL_TYPE_MENU:
2626 if (ctrl->qmenu == NULL)
2627 return -EINVAL;
2628 break;
2629 case V4L2_CTRL_TYPE_INTEGER_MENU:
2630 if (ctrl->qmenu_int == NULL)
2631 return -EINVAL;
2632 break;
2633 default:
2634 return -EINVAL;
2635 }
2636
2637 if (i < ctrl->minimum || i > ctrl->maximum)
2638 return -EINVAL;
2639
2640 /* Use mask to see if this menu item should be skipped */
2641 if (ctrl->menu_skip_mask & (1 << i))
2642 return -EINVAL;
2643 /* Empty menu items should also be skipped */
2644 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2645 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2646 return -EINVAL;
2647 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2648 } else {
2649 qm->value = ctrl->qmenu_int[i];
2650 }
2651 return 0;
2652 }
2653 EXPORT_SYMBOL(v4l2_querymenu);
2654
2655 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2656 {
2657 return v4l2_querymenu(sd->ctrl_handler, qm);
2658 }
2659 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2660
2661
2662
2663 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2664
2665 It is not a fully atomic operation, just best-effort only. After all, if
2666 multiple controls have to be set through multiple i2c writes (for example)
2667 then some initial writes may succeed while others fail. Thus leaving the
2668 system in an inconsistent state. The question is how much effort you are
2669 willing to spend on trying to make something atomic that really isn't.
2670
2671 From the point of view of an application the main requirement is that
2672 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2673 error should be returned without actually affecting any controls.
2674
2675 If all the values are correct, then it is acceptable to just give up
2676 in case of low-level errors.
2677
2678 It is important though that the application can tell when only a partial
2679 configuration was done. The way we do that is through the error_idx field
2680 of struct v4l2_ext_controls: if that is equal to the count field then no
2681 controls were affected. Otherwise all controls before that index were
2682 successful in performing their 'get' or 'set' operation, the control at
2683 the given index failed, and you don't know what happened with the controls
2684 after the failed one. Since if they were part of a control cluster they
2685 could have been successfully processed (if a cluster member was encountered
2686 at index < error_idx), they could have failed (if a cluster member was at
2687 error_idx), or they may not have been processed yet (if the first cluster
2688 member appeared after error_idx).
2689
2690 It is all fairly theoretical, though. In practice all you can do is to
2691 bail out. If error_idx == count, then it is an application bug. If
2692 error_idx < count then it is only an application bug if the error code was
2693 EBUSY. That usually means that something started streaming just when you
2694 tried to set the controls. In all other cases it is a driver/hardware
2695 problem and all you can do is to retry or bail out.
2696
2697 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2698 never modifies controls the error_idx is just set to whatever control
2699 has an invalid value.
2700 */
2701
2702 /* Prepare for the extended g/s/try functions.
2703 Find the controls in the control array and do some basic checks. */
2704 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2705 struct v4l2_ext_controls *cs,
2706 struct v4l2_ctrl_helper *helpers,
2707 bool get)
2708 {
2709 struct v4l2_ctrl_helper *h;
2710 bool have_clusters = false;
2711 u32 i;
2712
2713 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2714 struct v4l2_ext_control *c = &cs->controls[i];
2715 struct v4l2_ctrl_ref *ref;
2716 struct v4l2_ctrl *ctrl;
2717 u32 id = c->id & V4L2_CTRL_ID_MASK;
2718
2719 cs->error_idx = i;
2720
2721 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2722 return -EINVAL;
2723
2724 /* Old-style private controls are not allowed for
2725 extended controls */
2726 if (id >= V4L2_CID_PRIVATE_BASE)
2727 return -EINVAL;
2728 ref = find_ref_lock(hdl, id);
2729 if (ref == NULL)
2730 return -EINVAL;
2731 ctrl = ref->ctrl;
2732 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2733 return -EINVAL;
2734
2735 if (ctrl->cluster[0]->ncontrols > 1)
2736 have_clusters = true;
2737 if (ctrl->cluster[0] != ctrl)
2738 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2739 if (ctrl->is_ptr && !ctrl->is_string) {
2740 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2741
2742 if (c->size < tot_size) {
2743 if (get) {
2744 c->size = tot_size;
2745 return -ENOSPC;
2746 }
2747 return -EFAULT;
2748 }
2749 c->size = tot_size;
2750 }
2751 /* Store the ref to the master control of the cluster */
2752 h->mref = ref;
2753 h->ctrl = ctrl;
2754 /* Initially set next to 0, meaning that there is no other
2755 control in this helper array belonging to the same
2756 cluster */
2757 h->next = 0;
2758 }
2759
2760 /* We are done if there were no controls that belong to a multi-
2761 control cluster. */
2762 if (!have_clusters)
2763 return 0;
2764
2765 /* The code below figures out in O(n) time which controls in the list
2766 belong to the same cluster. */
2767
2768 /* This has to be done with the handler lock taken. */
2769 mutex_lock(hdl->lock);
2770
2771 /* First zero the helper field in the master control references */
2772 for (i = 0; i < cs->count; i++)
2773 helpers[i].mref->helper = NULL;
2774 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2775 struct v4l2_ctrl_ref *mref = h->mref;
2776
2777 /* If the mref->helper is set, then it points to an earlier
2778 helper that belongs to the same cluster. */
2779 if (mref->helper) {
2780 /* Set the next field of mref->helper to the current
2781 index: this means that that earlier helper now
2782 points to the next helper in the same cluster. */
2783 mref->helper->next = i;
2784 /* mref should be set only for the first helper in the
2785 cluster, clear the others. */
2786 h->mref = NULL;
2787 }
2788 /* Point the mref helper to the current helper struct. */
2789 mref->helper = h;
2790 }
2791 mutex_unlock(hdl->lock);
2792 return 0;
2793 }
2794
2795 /* Handles the corner case where cs->count == 0. It checks whether the
2796 specified control class exists. If that class ID is 0, then it checks
2797 whether there are any controls at all. */
2798 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2799 {
2800 if (ctrl_class == 0)
2801 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2802 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2803 }
2804
2805
2806
2807 /* Get extended controls. Allocates the helpers array if needed. */
2808 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2809 {
2810 struct v4l2_ctrl_helper helper[4];
2811 struct v4l2_ctrl_helper *helpers = helper;
2812 int ret;
2813 int i, j;
2814
2815 cs->error_idx = cs->count;
2816 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2817
2818 if (hdl == NULL)
2819 return -EINVAL;
2820
2821 if (cs->count == 0)
2822 return class_check(hdl, cs->ctrl_class);
2823
2824 if (cs->count > ARRAY_SIZE(helper)) {
2825 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2826 GFP_KERNEL);
2827 if (helpers == NULL)
2828 return -ENOMEM;
2829 }
2830
2831 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2832 cs->error_idx = cs->count;
2833
2834 for (i = 0; !ret && i < cs->count; i++)
2835 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2836 ret = -EACCES;
2837
2838 for (i = 0; !ret && i < cs->count; i++) {
2839 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2840 struct v4l2_ctrl *ctrl) = cur_to_user;
2841 struct v4l2_ctrl *master;
2842
2843 if (helpers[i].mref == NULL)
2844 continue;
2845
2846 master = helpers[i].mref->ctrl;
2847 cs->error_idx = i;
2848
2849 v4l2_ctrl_lock(master);
2850
2851 /* g_volatile_ctrl will update the new control values */
2852 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2853 (master->has_volatiles && !is_cur_manual(master))) {
2854 for (j = 0; j < master->ncontrols; j++)
2855 cur_to_new(master->cluster[j]);
2856 ret = call_op(master, g_volatile_ctrl);
2857 ctrl_to_user = new_to_user;
2858 }
2859 /* If OK, then copy the current (for non-volatile controls)
2860 or the new (for volatile controls) control values to the
2861 caller */
2862 if (!ret) {
2863 u32 idx = i;
2864
2865 do {
2866 ret = ctrl_to_user(cs->controls + idx,
2867 helpers[idx].ctrl);
2868 idx = helpers[idx].next;
2869 } while (!ret && idx);
2870 }
2871 v4l2_ctrl_unlock(master);
2872 }
2873
2874 if (cs->count > ARRAY_SIZE(helper))
2875 kfree(helpers);
2876 return ret;
2877 }
2878 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2879
2880 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2881 {
2882 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2883 }
2884 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2885
2886 /* Helper function to get a single control */
2887 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2888 {
2889 struct v4l2_ctrl *master = ctrl->cluster[0];
2890 int ret = 0;
2891 int i;
2892
2893 /* Compound controls are not supported. The new_to_user() and
2894 * cur_to_user() calls below would need to be modified not to access
2895 * userspace memory when called from get_ctrl().
2896 */
2897 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2898 return -EINVAL;
2899
2900 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2901 return -EACCES;
2902
2903 v4l2_ctrl_lock(master);
2904 /* g_volatile_ctrl will update the current control values */
2905 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2906 for (i = 0; i < master->ncontrols; i++)
2907 cur_to_new(master->cluster[i]);
2908 ret = call_op(master, g_volatile_ctrl);
2909 new_to_user(c, ctrl);
2910 } else {
2911 cur_to_user(c, ctrl);
2912 }
2913 v4l2_ctrl_unlock(master);
2914 return ret;
2915 }
2916
2917 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2918 {
2919 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2920 struct v4l2_ext_control c;
2921 int ret;
2922
2923 if (ctrl == NULL || !ctrl->is_int)
2924 return -EINVAL;
2925 ret = get_ctrl(ctrl, &c);
2926 control->value = c.value;
2927 return ret;
2928 }
2929 EXPORT_SYMBOL(v4l2_g_ctrl);
2930
2931 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2932 {
2933 return v4l2_g_ctrl(sd->ctrl_handler, control);
2934 }
2935 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2936
2937 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2938 {
2939 struct v4l2_ext_control c;
2940
2941 /* It's a driver bug if this happens. */
2942 WARN_ON(!ctrl->is_int);
2943 c.value = 0;
2944 get_ctrl(ctrl, &c);
2945 return c.value;
2946 }
2947 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2948
2949 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2950 {
2951 struct v4l2_ext_control c;
2952
2953 /* It's a driver bug if this happens. */
2954 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2955 c.value64 = 0;
2956 get_ctrl(ctrl, &c);
2957 return c.value64;
2958 }
2959 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2960
2961
2962 /* Core function that calls try/s_ctrl and ensures that the new value is
2963 copied to the current value on a set.
2964 Must be called with ctrl->handler->lock held. */
2965 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2966 bool set, u32 ch_flags)
2967 {
2968 bool update_flag;
2969 int ret;
2970 int i;
2971
2972 /* Go through the cluster and either validate the new value or
2973 (if no new value was set), copy the current value to the new
2974 value, ensuring a consistent view for the control ops when
2975 called. */
2976 for (i = 0; i < master->ncontrols; i++) {
2977 struct v4l2_ctrl *ctrl = master->cluster[i];
2978
2979 if (ctrl == NULL)
2980 continue;
2981
2982 if (!ctrl->is_new) {
2983 cur_to_new(ctrl);
2984 continue;
2985 }
2986 /* Check again: it may have changed since the
2987 previous check in try_or_set_ext_ctrls(). */
2988 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2989 return -EBUSY;
2990 }
2991
2992 ret = call_op(master, try_ctrl);
2993
2994 /* Don't set if there is no change */
2995 if (ret || !set || !cluster_changed(master))
2996 return ret;
2997 ret = call_op(master, s_ctrl);
2998 if (ret)
2999 return ret;
3000
3001 /* If OK, then make the new values permanent. */
3002 update_flag = is_cur_manual(master) != is_new_manual(master);
3003 for (i = 0; i < master->ncontrols; i++)
3004 new_to_cur(fh, master->cluster[i], ch_flags |
3005 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3006 return 0;
3007 }
3008
3009 /* Validate controls. */
3010 static int validate_ctrls(struct v4l2_ext_controls *cs,
3011 struct v4l2_ctrl_helper *helpers, bool set)
3012 {
3013 unsigned i;
3014 int ret = 0;
3015
3016 cs->error_idx = cs->count;
3017 for (i = 0; i < cs->count; i++) {
3018 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3019 union v4l2_ctrl_ptr p_new;
3020
3021 cs->error_idx = i;
3022
3023 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3024 return -EACCES;
3025 /* This test is also done in try_set_control_cluster() which
3026 is called in atomic context, so that has the final say,
3027 but it makes sense to do an up-front check as well. Once
3028 an error occurs in try_set_control_cluster() some other
3029 controls may have been set already and we want to do a
3030 best-effort to avoid that. */
3031 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3032 return -EBUSY;
3033 /*
3034 * Skip validation for now if the payload needs to be copied
3035 * from userspace into kernelspace. We'll validate those later.
3036 */
3037 if (ctrl->is_ptr)
3038 continue;
3039 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3040 p_new.p_s64 = &cs->controls[i].value64;
3041 else
3042 p_new.p_s32 = &cs->controls[i].value;
3043 ret = validate_new(ctrl, p_new);
3044 if (ret)
3045 return ret;
3046 }
3047 return 0;
3048 }
3049
3050 /* Obtain the current volatile values of an autocluster and mark them
3051 as new. */
3052 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3053 {
3054 int i;
3055
3056 for (i = 1; i < master->ncontrols; i++)
3057 cur_to_new(master->cluster[i]);
3058 if (!call_op(master, g_volatile_ctrl))
3059 for (i = 1; i < master->ncontrols; i++)
3060 if (master->cluster[i])
3061 master->cluster[i]->is_new = 1;
3062 }
3063
3064 /* Try or try-and-set controls */
3065 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3066 struct v4l2_ext_controls *cs,
3067 bool set)
3068 {
3069 struct v4l2_ctrl_helper helper[4];
3070 struct v4l2_ctrl_helper *helpers = helper;
3071 unsigned i, j;
3072 int ret;
3073
3074 cs->error_idx = cs->count;
3075 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
3076
3077 if (hdl == NULL)
3078 return -EINVAL;
3079
3080 if (cs->count == 0)
3081 return class_check(hdl, cs->ctrl_class);
3082
3083 if (cs->count > ARRAY_SIZE(helper)) {
3084 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3085 GFP_KERNEL);
3086 if (!helpers)
3087 return -ENOMEM;
3088 }
3089 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3090 if (!ret)
3091 ret = validate_ctrls(cs, helpers, set);
3092 if (ret && set)
3093 cs->error_idx = cs->count;
3094 for (i = 0; !ret && i < cs->count; i++) {
3095 struct v4l2_ctrl *master;
3096 u32 idx = i;
3097
3098 if (helpers[i].mref == NULL)
3099 continue;
3100
3101 cs->error_idx = i;
3102 master = helpers[i].mref->ctrl;
3103 v4l2_ctrl_lock(master);
3104
3105 /* Reset the 'is_new' flags of the cluster */
3106 for (j = 0; j < master->ncontrols; j++)
3107 if (master->cluster[j])
3108 master->cluster[j]->is_new = 0;
3109
3110 /* For volatile autoclusters that are currently in auto mode
3111 we need to discover if it will be set to manual mode.
3112 If so, then we have to copy the current volatile values
3113 first since those will become the new manual values (which
3114 may be overwritten by explicit new values from this set
3115 of controls). */
3116 if (master->is_auto && master->has_volatiles &&
3117 !is_cur_manual(master)) {
3118 /* Pick an initial non-manual value */
3119 s32 new_auto_val = master->manual_mode_value + 1;
3120 u32 tmp_idx = idx;
3121
3122 do {
3123 /* Check if the auto control is part of the
3124 list, and remember the new value. */
3125 if (helpers[tmp_idx].ctrl == master)
3126 new_auto_val = cs->controls[tmp_idx].value;
3127 tmp_idx = helpers[tmp_idx].next;
3128 } while (tmp_idx);
3129 /* If the new value == the manual value, then copy
3130 the current volatile values. */
3131 if (new_auto_val == master->manual_mode_value)
3132 update_from_auto_cluster(master);
3133 }
3134
3135 /* Copy the new caller-supplied control values.
3136 user_to_new() sets 'is_new' to 1. */
3137 do {
3138 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3139
3140 ret = user_to_new(cs->controls + idx, ctrl);
3141 if (!ret && ctrl->is_ptr)
3142 ret = validate_new(ctrl, ctrl->p_new);
3143 idx = helpers[idx].next;
3144 } while (!ret && idx);
3145
3146 if (!ret)
3147 ret = try_or_set_cluster(fh, master, set, 0);
3148
3149 /* Copy the new values back to userspace. */
3150 if (!ret) {
3151 idx = i;
3152 do {
3153 ret = new_to_user(cs->controls + idx,
3154 helpers[idx].ctrl);
3155 idx = helpers[idx].next;
3156 } while (!ret && idx);
3157 }
3158 v4l2_ctrl_unlock(master);
3159 }
3160
3161 if (cs->count > ARRAY_SIZE(helper))
3162 kfree(helpers);
3163 return ret;
3164 }
3165
3166 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3167 {
3168 return try_set_ext_ctrls(NULL, hdl, cs, false);
3169 }
3170 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3171
3172 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3173 struct v4l2_ext_controls *cs)
3174 {
3175 return try_set_ext_ctrls(fh, hdl, cs, true);
3176 }
3177 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3178
3179 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3180 {
3181 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
3182 }
3183 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
3184
3185 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3186 {
3187 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
3188 }
3189 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
3190
3191 /* Helper function for VIDIOC_S_CTRL compatibility */
3192 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3193 {
3194 struct v4l2_ctrl *master = ctrl->cluster[0];
3195 int ret;
3196 int i;
3197
3198 /* Reset the 'is_new' flags of the cluster */
3199 for (i = 0; i < master->ncontrols; i++)
3200 if (master->cluster[i])
3201 master->cluster[i]->is_new = 0;
3202
3203 ret = validate_new(ctrl, ctrl->p_new);
3204 if (ret)
3205 return ret;
3206
3207 /* For autoclusters with volatiles that are switched from auto to
3208 manual mode we have to update the current volatile values since
3209 those will become the initial manual values after such a switch. */
3210 if (master->is_auto && master->has_volatiles && ctrl == master &&
3211 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3212 update_from_auto_cluster(master);
3213
3214 ctrl->is_new = 1;
3215 return try_or_set_cluster(fh, master, true, ch_flags);
3216 }
3217
3218 /* Helper function for VIDIOC_S_CTRL compatibility */
3219 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3220 struct v4l2_ext_control *c)
3221 {
3222 int ret;
3223
3224 v4l2_ctrl_lock(ctrl);
3225 user_to_new(c, ctrl);
3226 ret = set_ctrl(fh, ctrl, 0);
3227 if (!ret)
3228 cur_to_user(c, ctrl);
3229 v4l2_ctrl_unlock(ctrl);
3230 return ret;
3231 }
3232
3233 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3234 struct v4l2_control *control)
3235 {
3236 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3237 struct v4l2_ext_control c = { control->id };
3238 int ret;
3239
3240 if (ctrl == NULL || !ctrl->is_int)
3241 return -EINVAL;
3242
3243 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3244 return -EACCES;
3245
3246 c.value = control->value;
3247 ret = set_ctrl_lock(fh, ctrl, &c);
3248 control->value = c.value;
3249 return ret;
3250 }
3251 EXPORT_SYMBOL(v4l2_s_ctrl);
3252
3253 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
3254 {
3255 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
3256 }
3257 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
3258
3259 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3260 {
3261 lockdep_assert_held(ctrl->handler->lock);
3262
3263 /* It's a driver bug if this happens. */
3264 WARN_ON(!ctrl->is_int);
3265 ctrl->val = val;
3266 return set_ctrl(NULL, ctrl, 0);
3267 }
3268 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3269
3270 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3271 {
3272 lockdep_assert_held(ctrl->handler->lock);
3273
3274 /* It's a driver bug if this happens. */
3275 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3276 *ctrl->p_new.p_s64 = val;
3277 return set_ctrl(NULL, ctrl, 0);
3278 }
3279 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3280
3281 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3282 {
3283 lockdep_assert_held(ctrl->handler->lock);
3284
3285 /* It's a driver bug if this happens. */
3286 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3287 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3288 return set_ctrl(NULL, ctrl, 0);
3289 }
3290 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3291
3292 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3293 {
3294 if (ctrl == NULL)
3295 return;
3296 if (notify == NULL) {
3297 ctrl->call_notify = 0;
3298 return;
3299 }
3300 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3301 return;
3302 ctrl->handler->notify = notify;
3303 ctrl->handler->notify_priv = priv;
3304 ctrl->call_notify = 1;
3305 }
3306 EXPORT_SYMBOL(v4l2_ctrl_notify);
3307
3308 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3309 s64 min, s64 max, u64 step, s64 def)
3310 {
3311 bool changed;
3312 int ret;
3313
3314 lockdep_assert_held(ctrl->handler->lock);
3315
3316 switch (ctrl->type) {
3317 case V4L2_CTRL_TYPE_INTEGER:
3318 case V4L2_CTRL_TYPE_INTEGER64:
3319 case V4L2_CTRL_TYPE_BOOLEAN:
3320 case V4L2_CTRL_TYPE_MENU:
3321 case V4L2_CTRL_TYPE_INTEGER_MENU:
3322 case V4L2_CTRL_TYPE_BITMASK:
3323 case V4L2_CTRL_TYPE_U8:
3324 case V4L2_CTRL_TYPE_U16:
3325 case V4L2_CTRL_TYPE_U32:
3326 if (ctrl->is_array)
3327 return -EINVAL;
3328 ret = check_range(ctrl->type, min, max, step, def);
3329 if (ret)
3330 return ret;
3331 break;
3332 default:
3333 return -EINVAL;
3334 }
3335 ctrl->minimum = min;
3336 ctrl->maximum = max;
3337 ctrl->step = step;
3338 ctrl->default_value = def;
3339 cur_to_new(ctrl);
3340 if (validate_new(ctrl, ctrl->p_new)) {
3341 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3342 *ctrl->p_new.p_s64 = def;
3343 else
3344 *ctrl->p_new.p_s32 = def;
3345 }
3346
3347 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3348 changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3349 else
3350 changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3351 if (changed)
3352 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3353 else
3354 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3355 return ret;
3356 }
3357 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3358
3359 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3360 {
3361 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3362
3363 if (ctrl == NULL)
3364 return -EINVAL;
3365
3366 v4l2_ctrl_lock(ctrl);
3367 list_add_tail(&sev->node, &ctrl->ev_subs);
3368 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3369 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3370 struct v4l2_event ev;
3371 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3372
3373 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3374 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3375 fill_event(&ev, ctrl, changes);
3376 /* Mark the queue as active, allowing this initial
3377 event to be accepted. */
3378 sev->elems = elems;
3379 v4l2_event_queue_fh(sev->fh, &ev);
3380 }
3381 v4l2_ctrl_unlock(ctrl);
3382 return 0;
3383 }
3384
3385 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3386 {
3387 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3388
3389 v4l2_ctrl_lock(ctrl);
3390 list_del(&sev->node);
3391 v4l2_ctrl_unlock(ctrl);
3392 }
3393
3394 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3395 {
3396 u32 old_changes = old->u.ctrl.changes;
3397
3398 old->u.ctrl = new->u.ctrl;
3399 old->u.ctrl.changes |= old_changes;
3400 }
3401 EXPORT_SYMBOL(v4l2_ctrl_replace);
3402
3403 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3404 {
3405 new->u.ctrl.changes |= old->u.ctrl.changes;
3406 }
3407 EXPORT_SYMBOL(v4l2_ctrl_merge);
3408
3409 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3410 .add = v4l2_ctrl_add_event,
3411 .del = v4l2_ctrl_del_event,
3412 .replace = v4l2_ctrl_replace,
3413 .merge = v4l2_ctrl_merge,
3414 };
3415 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3416
3417 int v4l2_ctrl_log_status(struct file *file, void *fh)
3418 {
3419 struct video_device *vfd = video_devdata(file);
3420 struct v4l2_fh *vfh = file->private_data;
3421
3422 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3423 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3424 vfd->v4l2_dev->name);
3425 return 0;
3426 }
3427 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3428
3429 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3430 const struct v4l2_event_subscription *sub)
3431 {
3432 if (sub->type == V4L2_EVENT_CTRL)
3433 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3434 return -EINVAL;
3435 }
3436 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3437
3438 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3439 struct v4l2_event_subscription *sub)
3440 {
3441 if (!sd->ctrl_handler)
3442 return -EINVAL;
3443 return v4l2_ctrl_subscribe_event(fh, sub);
3444 }
3445 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3446
3447 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3448 {
3449 struct v4l2_fh *fh = file->private_data;
3450
3451 if (v4l2_event_pending(fh))
3452 return POLLPRI;
3453 poll_wait(file, &fh->wait, wait);
3454 return 0;
3455 }
3456 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux with added FPC-III support