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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6-block.git] / drivers / media / video / v4l2-ctrls.c
CommitLineData
0996517c
HV		 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>
2b80163c 22#include <linux/slab.h>
0996517c
HV		 23#include <media/v4l2-ioctl.h>
24#include <media/v4l2-device.h>
25#include <media/v4l2-ctrls.h>
26#include <media/v4l2-dev.h>
27
28/* Internal temporary helper struct, one for each v4l2_ext_control */
29struct ctrl_helper {
30 /* The control corresponding to the v4l2_ext_control ID field. */
31 struct v4l2_ctrl *ctrl;
32 /* Used internally to mark whether this control was already
33 processed. */
34 bool handled;
35};
36
37/* Returns NULL or a character pointer array containing the menu for
38 the given control ID. The pointer array ends with a NULL pointer.
39 An empty string signifies a menu entry that is invalid. This allows
40 drivers to disable certain options if it is not supported. */
513521ea 41const char * const *v4l2_ctrl_get_menu(u32 id)
0996517c 42{
513521ea 43 static const char * const mpeg_audio_sampling_freq[] = {
0996517c
HV		 44 "44.1 kHz",
45 "48 kHz",
46 "32 kHz",
47 NULL
48 };
513521ea 49 static const char * const mpeg_audio_encoding[] = {
0996517c
HV		 50 "MPEG-1/2 Layer I",
51 "MPEG-1/2 Layer II",
52 "MPEG-1/2 Layer III",
53 "MPEG-2/4 AAC",
54 "AC-3",
55 NULL
56 };
513521ea 57 static const char * const mpeg_audio_l1_bitrate[] = {
0996517c
HV		 58 "32 kbps",
59 "64 kbps",
60 "96 kbps",
61 "128 kbps",
62 "160 kbps",
63 "192 kbps",
64 "224 kbps",
65 "256 kbps",
66 "288 kbps",
67 "320 kbps",
68 "352 kbps",
69 "384 kbps",
70 "416 kbps",
71 "448 kbps",
72 NULL
73 };
513521ea 74 static const char * const mpeg_audio_l2_bitrate[] = {
0996517c
HV		 75 "32 kbps",
76 "48 kbps",
77 "56 kbps",
78 "64 kbps",
79 "80 kbps",
80 "96 kbps",
81 "112 kbps",
82 "128 kbps",
83 "160 kbps",
84 "192 kbps",
85 "224 kbps",
86 "256 kbps",
87 "320 kbps",
88 "384 kbps",
89 NULL
90 };
513521ea 91 static const char * const mpeg_audio_l3_bitrate[] = {
0996517c
HV		 92 "32 kbps",
93 "40 kbps",
94 "48 kbps",
95 "56 kbps",
96 "64 kbps",
97 "80 kbps",
98 "96 kbps",
99 "112 kbps",
100 "128 kbps",
101 "160 kbps",
102 "192 kbps",
103 "224 kbps",
104 "256 kbps",
105 "320 kbps",
106 NULL
107 };
513521ea 108 static const char * const mpeg_audio_ac3_bitrate[] = {
0996517c
HV		 109 "32 kbps",
110 "40 kbps",
111 "48 kbps",
112 "56 kbps",
113 "64 kbps",
114 "80 kbps",
115 "96 kbps",
116 "112 kbps",
117 "128 kbps",
118 "160 kbps",
119 "192 kbps",
120 "224 kbps",
121 "256 kbps",
122 "320 kbps",
123 "384 kbps",
124 "448 kbps",
125 "512 kbps",
126 "576 kbps",
127 "640 kbps",
128 NULL
129 };
513521ea 130 static const char * const mpeg_audio_mode[] = {
0996517c
HV		 131 "Stereo",
132 "Joint Stereo",
133 "Dual",
134 "Mono",
135 NULL
136 };
513521ea 137 static const char * const mpeg_audio_mode_extension[] = {
0996517c
HV		 138 "Bound 4",
139 "Bound 8",
140 "Bound 12",
141 "Bound 16",
142 NULL
143 };
513521ea 144 static const char * const mpeg_audio_emphasis[] = {
0996517c
HV		 145 "No Emphasis",
146 "50/15 us",
147 "CCITT J17",
148 NULL
149 };
513521ea 150 static const char * const mpeg_audio_crc[] = {
0996517c
HV		 151 "No CRC",
152 "16-bit CRC",
153 NULL
154 };
513521ea 155 static const char * const mpeg_video_encoding[] = {
0996517c
HV		 156 "MPEG-1",
157 "MPEG-2",
158 "MPEG-4 AVC",
159 NULL
160 };
513521ea 161 static const char * const mpeg_video_aspect[] = {
0996517c
HV		 162 "1x1",
163 "4x3",
164 "16x9",
165 "2.21x1",
166 NULL
167 };
513521ea 168 static const char * const mpeg_video_bitrate_mode[] = {
0996517c
HV		 169 "Variable Bitrate",
170 "Constant Bitrate",
171 NULL
172 };
513521ea 173 static const char * const mpeg_stream_type[] = {
0996517c
HV		 174 "MPEG-2 Program Stream",
175 "MPEG-2 Transport Stream",
176 "MPEG-1 System Stream",
177 "MPEG-2 DVD-compatible Stream",
178 "MPEG-1 VCD-compatible Stream",
179 "MPEG-2 SVCD-compatible Stream",
180 NULL
181 };
513521ea 182 static const char * const mpeg_stream_vbi_fmt[] = {
0996517c
HV		 183 "No VBI",
184 "Private packet, IVTV format",
185 NULL
186 };
513521ea 187 static const char * const camera_power_line_frequency[] = {
0996517c
HV		 188 "Disabled",
189 "50 Hz",
190 "60 Hz",
191 NULL
192 };
513521ea 193 static const char * const camera_exposure_auto[] = {
0996517c
HV		 194 "Auto Mode",
195 "Manual Mode",
196 "Shutter Priority Mode",
197 "Aperture Priority Mode",
198 NULL
199 };
513521ea 200 static const char * const colorfx[] = {
0996517c
HV		 201 "None",
202 "Black & White",
203 "Sepia",
204 "Negative",
205 "Emboss",
206 "Sketch",
207 "Sky blue",
208 "Grass green",
209 "Skin whiten",
210 "Vivid",
211 NULL
212 };
513521ea 213 static const char * const tune_preemphasis[] = {
0996517c
HV		 214 "No preemphasis",
215 "50 useconds",
216 "75 useconds",
217 NULL,
218 };
219
220 switch (id) {
221 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
222 return mpeg_audio_sampling_freq;
223 case V4L2_CID_MPEG_AUDIO_ENCODING:
224 return mpeg_audio_encoding;
225 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
226 return mpeg_audio_l1_bitrate;
227 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
228 return mpeg_audio_l2_bitrate;
229 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
230 return mpeg_audio_l3_bitrate;
231 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
232 return mpeg_audio_ac3_bitrate;
233 case V4L2_CID_MPEG_AUDIO_MODE:
234 return mpeg_audio_mode;
235 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
236 return mpeg_audio_mode_extension;
237 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
238 return mpeg_audio_emphasis;
239 case V4L2_CID_MPEG_AUDIO_CRC:
240 return mpeg_audio_crc;
241 case V4L2_CID_MPEG_VIDEO_ENCODING:
242 return mpeg_video_encoding;
243 case V4L2_CID_MPEG_VIDEO_ASPECT:
244 return mpeg_video_aspect;
245 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
246 return mpeg_video_bitrate_mode;
247 case V4L2_CID_MPEG_STREAM_TYPE:
248 return mpeg_stream_type;
249 case V4L2_CID_MPEG_STREAM_VBI_FMT:
250 return mpeg_stream_vbi_fmt;
251 case V4L2_CID_POWER_LINE_FREQUENCY:
252 return camera_power_line_frequency;
253 case V4L2_CID_EXPOSURE_AUTO:
254 return camera_exposure_auto;
255 case V4L2_CID_COLORFX:
256 return colorfx;
257 case V4L2_CID_TUNE_PREEMPHASIS:
258 return tune_preemphasis;
259 default:
260 return NULL;
261 }
262}
263EXPORT_SYMBOL(v4l2_ctrl_get_menu);
264
265/* Return the control name. */
266const char *v4l2_ctrl_get_name(u32 id)
267{
268 switch (id) {
269 /* USER controls */
6c8d6111 270 /* Keep the order of the 'case's the same as in videodev2.h! */
6dd5aff3
MCC		 271 case V4L2_CID_USER_CLASS: return "User Controls";
272 case V4L2_CID_BRIGHTNESS: return "Brightness";
273 case V4L2_CID_CONTRAST: return "Contrast";
274 case V4L2_CID_SATURATION: return "Saturation";
275 case V4L2_CID_HUE: return "Hue";
276 case V4L2_CID_AUDIO_VOLUME: return "Volume";
277 case V4L2_CID_AUDIO_BALANCE: return "Balance";
278 case V4L2_CID_AUDIO_BASS: return "Bass";
279 case V4L2_CID_AUDIO_TREBLE: return "Treble";
280 case V4L2_CID_AUDIO_MUTE: return "Mute";
281 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
0996517c
HV		 282 case V4L2_CID_BLACK_LEVEL: return "Black Level";
283 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
284 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
285 case V4L2_CID_RED_BALANCE: return "Red Balance";
286 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
287 case V4L2_CID_GAMMA: return "Gamma";
288 case V4L2_CID_EXPOSURE: return "Exposure";
289 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
290 case V4L2_CID_GAIN: return "Gain";
291 case V4L2_CID_HFLIP: return "Horizontal Flip";
292 case V4L2_CID_VFLIP: return "Vertical Flip";
293 case V4L2_CID_HCENTER: return "Horizontal Center";
294 case V4L2_CID_VCENTER: return "Vertical Center";
295 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
296 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
297 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
298 case V4L2_CID_SHARPNESS: return "Sharpness";
299 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
300 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
0996517c
HV		 301 case V4L2_CID_COLOR_KILLER: return "Color Killer";
302 case V4L2_CID_COLORFX: return "Color Effects";
303 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
304 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
305 case V4L2_CID_ROTATE: return "Rotate";
306 case V4L2_CID_BG_COLOR: return "Background Color";
6c8d6111 307 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
008d35f2
JFM		 308 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
309 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
0996517c
HV		 310
311 /* MPEG controls */
6c8d6111 312 /* Keep the order of the 'case's the same as in videodev2.h! */
6dd5aff3
MCC		 313 case V4L2_CID_MPEG_CLASS: return "MPEG Encoder Controls";
314 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
315 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
316 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
317 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
318 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
6c8d6111
HV		 319 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
320 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
321 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
0996517c 322 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
6dd5aff3
MCC		 323 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
324 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
325 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
326 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
327 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
0996517c 328 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
6dd5aff3
MCC		 329 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
330 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
331 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
332 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
333 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
334 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
335 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
336 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
337 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
338 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
339 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
340 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
341 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
342 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
0996517c 343 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
6dd5aff3 344 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
0996517c 345 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
0996517c
HV		 346
347 /* CAMERA controls */
6c8d6111 348 /* Keep the order of the 'case's the same as in videodev2.h! */
0996517c
HV		 349 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
350 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
351 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
352 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
353 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
354 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
355 case V4L2_CID_PAN_RESET: return "Pan, Reset";
356 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
357 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
358 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
359 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
360 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
361 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic";
0996517c
HV		 362 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
363 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
364 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
365 case V4L2_CID_PRIVACY: return "Privacy";
6c8d6111
HV		 366 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
367 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
0996517c
HV		 368
369 /* FM Radio Modulator control */
6c8d6111 370 /* Keep the order of the 'case's the same as in videodev2.h! */
0996517c
HV		 371 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
372 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
373 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
374 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
375 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
376 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
377 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
378 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
379 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
380 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Feature Enabled";
381 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
382 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
383 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
384 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
385 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
386 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
387 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
388 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-emphasis settings";
389 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
390 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
391
392 default:
393 return NULL;
394 }
395}
396EXPORT_SYMBOL(v4l2_ctrl_get_name);
397
398void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
399 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
400{
401 *name = v4l2_ctrl_get_name(id);
402 *flags = 0;
403
404 switch (id) {
405 case V4L2_CID_AUDIO_MUTE:
406 case V4L2_CID_AUDIO_LOUDNESS:
407 case V4L2_CID_AUTO_WHITE_BALANCE:
408 case V4L2_CID_AUTOGAIN:
409 case V4L2_CID_HFLIP:
410 case V4L2_CID_VFLIP:
411 case V4L2_CID_HUE_AUTO:
412 case V4L2_CID_CHROMA_AGC:
413 case V4L2_CID_COLOR_KILLER:
414 case V4L2_CID_MPEG_AUDIO_MUTE:
415 case V4L2_CID_MPEG_VIDEO_MUTE:
416 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
417 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
418 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
419 case V4L2_CID_FOCUS_AUTO:
420 case V4L2_CID_PRIVACY:
421 case V4L2_CID_AUDIO_LIMITER_ENABLED:
422 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
423 case V4L2_CID_PILOT_TONE_ENABLED:
008d35f2
JFM		 424 case V4L2_CID_ILLUMINATORS_1:
425 case V4L2_CID_ILLUMINATORS_2:
0996517c
HV		 426 *type = V4L2_CTRL_TYPE_BOOLEAN;
427 *min = 0;
428 *max = *step = 1;
429 break;
430 case V4L2_CID_PAN_RESET:
431 case V4L2_CID_TILT_RESET:
432 *type = V4L2_CTRL_TYPE_BUTTON;
433 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
434 *min = *max = *step = *def = 0;
435 break;
436 case V4L2_CID_POWER_LINE_FREQUENCY:
437 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
438 case V4L2_CID_MPEG_AUDIO_ENCODING:
439 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
440 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
441 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
442 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
443 case V4L2_CID_MPEG_AUDIO_MODE:
444 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
445 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
446 case V4L2_CID_MPEG_AUDIO_CRC:
447 case V4L2_CID_MPEG_VIDEO_ENCODING:
448 case V4L2_CID_MPEG_VIDEO_ASPECT:
449 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
450 case V4L2_CID_MPEG_STREAM_TYPE:
451 case V4L2_CID_MPEG_STREAM_VBI_FMT:
452 case V4L2_CID_EXPOSURE_AUTO:
453 case V4L2_CID_COLORFX:
454 case V4L2_CID_TUNE_PREEMPHASIS:
455 *type = V4L2_CTRL_TYPE_MENU;
456 break;
457 case V4L2_CID_RDS_TX_PS_NAME:
458 case V4L2_CID_RDS_TX_RADIO_TEXT:
459 *type = V4L2_CTRL_TYPE_STRING;
460 break;
461 case V4L2_CID_USER_CLASS:
462 case V4L2_CID_CAMERA_CLASS:
463 case V4L2_CID_MPEG_CLASS:
464 case V4L2_CID_FM_TX_CLASS:
465 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
466 /* You can neither read not write these */
467 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
468 *min = *max = *step = *def = 0;
469 break;
470 case V4L2_CID_BG_COLOR:
471 *type = V4L2_CTRL_TYPE_INTEGER;
472 *step = 1;
473 *min = 0;
474 /* Max is calculated as RGB888 that is 2^24 */
475 *max = 0xFFFFFF;
476 break;
477 default:
478 *type = V4L2_CTRL_TYPE_INTEGER;
479 break;
480 }
481 switch (id) {
482 case V4L2_CID_MPEG_AUDIO_ENCODING:
483 case V4L2_CID_MPEG_AUDIO_MODE:
484 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
485 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
486 case V4L2_CID_MPEG_STREAM_TYPE:
487 *flags |= V4L2_CTRL_FLAG_UPDATE;
488 break;
489 case V4L2_CID_AUDIO_VOLUME:
490 case V4L2_CID_AUDIO_BALANCE:
491 case V4L2_CID_AUDIO_BASS:
492 case V4L2_CID_AUDIO_TREBLE:
493 case V4L2_CID_BRIGHTNESS:
494 case V4L2_CID_CONTRAST:
495 case V4L2_CID_SATURATION:
496 case V4L2_CID_HUE:
497 case V4L2_CID_RED_BALANCE:
498 case V4L2_CID_BLUE_BALANCE:
499 case V4L2_CID_GAMMA:
500 case V4L2_CID_SHARPNESS:
501 case V4L2_CID_CHROMA_GAIN:
502 case V4L2_CID_RDS_TX_DEVIATION:
503 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
504 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
505 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
506 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
507 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
508 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
509 case V4L2_CID_PILOT_TONE_DEVIATION:
510 case V4L2_CID_PILOT_TONE_FREQUENCY:
511 case V4L2_CID_TUNE_POWER_LEVEL:
512 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
513 *flags |= V4L2_CTRL_FLAG_SLIDER;
514 break;
515 case V4L2_CID_PAN_RELATIVE:
516 case V4L2_CID_TILT_RELATIVE:
517 case V4L2_CID_FOCUS_RELATIVE:
518 case V4L2_CID_IRIS_RELATIVE:
519 case V4L2_CID_ZOOM_RELATIVE:
520 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
521 break;
522 }
523}
524EXPORT_SYMBOL(v4l2_ctrl_fill);
525
526/* Helper function to determine whether the control type is compatible with
527 VIDIOC_G/S_CTRL. */
528static bool type_is_int(const struct v4l2_ctrl *ctrl)
529{
530 switch (ctrl->type) {
531 case V4L2_CTRL_TYPE_INTEGER64:
532 case V4L2_CTRL_TYPE_STRING:
533 /* Nope, these need v4l2_ext_control */
534 return false;
535 default:
536 return true;
537 }
538}
539
540/* Helper function: copy the current control value back to the caller */
541static int cur_to_user(struct v4l2_ext_control *c,
542 struct v4l2_ctrl *ctrl)
543{
544 u32 len;
545
546 switch (ctrl->type) {
547 case V4L2_CTRL_TYPE_STRING:
548 len = strlen(ctrl->cur.string);
549 if (c->size < len + 1) {
550 c->size = len + 1;
551 return -ENOSPC;
552 }
553 return copy_to_user(c->string, ctrl->cur.string,
554 len + 1) ? -EFAULT : 0;
555 case V4L2_CTRL_TYPE_INTEGER64:
556 c->value64 = ctrl->cur.val64;
557 break;
558 default:
559 c->value = ctrl->cur.val;
560 break;
561 }
562 return 0;
563}
564
565/* Helper function: copy the caller-provider value as the new control value */
566static int user_to_new(struct v4l2_ext_control *c,
567 struct v4l2_ctrl *ctrl)
568{
569 int ret;
570 u32 size;
571
572 ctrl->has_new = 1;
573 switch (ctrl->type) {
574 case V4L2_CTRL_TYPE_INTEGER64:
575 ctrl->val64 = c->value64;
576 break;
577 case V4L2_CTRL_TYPE_STRING:
578 size = c->size;
579 if (size == 0)
580 return -ERANGE;
581 if (size > ctrl->maximum + 1)
582 size = ctrl->maximum + 1;
583 ret = copy_from_user(ctrl->string, c->string, size);
584 if (!ret) {
585 char last = ctrl->string[size - 1];
586
587 ctrl->string[size - 1] = 0;
588 /* If the string was longer than ctrl->maximum,
589 then return an error. */
590 if (strlen(ctrl->string) == ctrl->maximum && last)
591 return -ERANGE;
592 }
593 return ret ? -EFAULT : 0;
594 default:
595 ctrl->val = c->value;
596 break;
597 }
598 return 0;
599}
600
601/* Helper function: copy the new control value back to the caller */
602static int new_to_user(struct v4l2_ext_control *c,
603 struct v4l2_ctrl *ctrl)
604{
605 u32 len;
606
607 switch (ctrl->type) {
608 case V4L2_CTRL_TYPE_STRING:
609 len = strlen(ctrl->string);
610 if (c->size < len + 1) {
611 c->size = ctrl->maximum + 1;
612 return -ENOSPC;
613 }
614 return copy_to_user(c->string, ctrl->string,
615 len + 1) ? -EFAULT : 0;
616 case V4L2_CTRL_TYPE_INTEGER64:
617 c->value64 = ctrl->val64;
618 break;
619 default:
620 c->value = ctrl->val;
621 break;
622 }
623 return 0;
624}
625
626/* Copy the new value to the current value. */
627static void new_to_cur(struct v4l2_ctrl *ctrl)
628{
629 if (ctrl == NULL)
630 return;
631 switch (ctrl->type) {
632 case V4L2_CTRL_TYPE_STRING:
633 /* strings are always 0-terminated */
634 strcpy(ctrl->cur.string, ctrl->string);
635 break;
636 case V4L2_CTRL_TYPE_INTEGER64:
637 ctrl->cur.val64 = ctrl->val64;
638 break;
639 default:
640 ctrl->cur.val = ctrl->val;
641 break;
642 }
643}
644
645/* Copy the current value to the new value */
646static void cur_to_new(struct v4l2_ctrl *ctrl)
647{
648 if (ctrl == NULL)
649 return;
650 switch (ctrl->type) {
651 case V4L2_CTRL_TYPE_STRING:
652 /* strings are always 0-terminated */
653 strcpy(ctrl->string, ctrl->cur.string);
654 break;
655 case V4L2_CTRL_TYPE_INTEGER64:
656 ctrl->val64 = ctrl->cur.val64;
657 break;
658 default:
659 ctrl->val = ctrl->cur.val;
660 break;
661 }
662}
663
664/* Return non-zero if one or more of the controls in the cluster has a new
665 value that differs from the current value. */
666static int cluster_changed(struct v4l2_ctrl *master)
667{
668 int diff = 0;
669 int i;
670
671 for (i = 0; !diff && i < master->ncontrols; i++) {
672 struct v4l2_ctrl *ctrl = master->cluster[i];
673
674 if (ctrl == NULL)
675 continue;
676 switch (ctrl->type) {
677 case V4L2_CTRL_TYPE_BUTTON:
678 /* Button controls are always 'different' */
679 return 1;
680 case V4L2_CTRL_TYPE_STRING:
681 /* strings are always 0-terminated */
682 diff = strcmp(ctrl->string, ctrl->cur.string);
683 break;
684 case V4L2_CTRL_TYPE_INTEGER64:
685 diff = ctrl->val64 != ctrl->cur.val64;
686 break;
687 default:
688 diff = ctrl->val != ctrl->cur.val;
689 break;
690 }
691 }
692 return diff;
693}
694
695/* Validate a new control */
696static int validate_new(struct v4l2_ctrl *ctrl)
697{
698 s32 val = ctrl->val;
699 char *s = ctrl->string;
700 u32 offset;
701 size_t len;
702
703 switch (ctrl->type) {
704 case V4L2_CTRL_TYPE_INTEGER:
705 /* Round towards the closest legal value */
706 val += ctrl->step / 2;
707 if (val < ctrl->minimum)
708 val = ctrl->minimum;
709 if (val > ctrl->maximum)
710 val = ctrl->maximum;
711 offset = val - ctrl->minimum;
712 offset = ctrl->step * (offset / ctrl->step);
713 val = ctrl->minimum + offset;
714 ctrl->val = val;
715 return 0;
716
717 case V4L2_CTRL_TYPE_BOOLEAN:
718 ctrl->val = !!ctrl->val;
719 return 0;
720
721 case V4L2_CTRL_TYPE_MENU:
722 if (val < ctrl->minimum || val > ctrl->maximum)
723 return -ERANGE;
724 if (ctrl->qmenu[val][0] == '\0' ||
725 (ctrl->menu_skip_mask & (1 << val)))
726 return -EINVAL;
727 return 0;
728
729 case V4L2_CTRL_TYPE_BUTTON:
730 case V4L2_CTRL_TYPE_CTRL_CLASS:
731 ctrl->val64 = 0;
732 return 0;
733
734 case V4L2_CTRL_TYPE_INTEGER64:
735 return 0;
736
737 case V4L2_CTRL_TYPE_STRING:
738 len = strlen(s);
739 if (len < ctrl->minimum)
740 return -ERANGE;
741 if ((len - ctrl->minimum) % ctrl->step)
742 return -ERANGE;
743 return 0;
744
745 default:
746 return -EINVAL;
747 }
748}
749
750static inline u32 node2id(struct list_head *node)
751{
752 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
753}
754
755/* Set the handler's error code if it wasn't set earlier already */
756static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
757{
758 if (hdl->error == 0)
759 hdl->error = err;
760 return err;
761}
762
763/* Initialize the handler */
764int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
765 unsigned nr_of_controls_hint)
766{
767 mutex_init(&hdl->lock);
768 INIT_LIST_HEAD(&hdl->ctrls);
769 INIT_LIST_HEAD(&hdl->ctrl_refs);
770 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
771 hdl->buckets = kzalloc(sizeof(hdl->buckets[0]) * hdl->nr_of_buckets,
772 GFP_KERNEL);
773 hdl->error = hdl->buckets ? 0 : -ENOMEM;
774 return hdl->error;
775}
776EXPORT_SYMBOL(v4l2_ctrl_handler_init);
777
778/* Free all controls and control refs */
779void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
780{
781 struct v4l2_ctrl_ref *ref, *next_ref;
782 struct v4l2_ctrl *ctrl, *next_ctrl;
783
784 if (hdl == NULL || hdl->buckets == NULL)
785 return;
786
787 mutex_lock(&hdl->lock);
788 /* Free all nodes */
789 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
790 list_del(&ref->node);
791 kfree(ref);
792 }
793 /* Free all controls owned by the handler */
794 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
795 list_del(&ctrl->node);
796 kfree(ctrl);
797 }
798 kfree(hdl->buckets);
799 hdl->buckets = NULL;
800 hdl->cached = NULL;
801 hdl->error = 0;
802 mutex_unlock(&hdl->lock);
803}
804EXPORT_SYMBOL(v4l2_ctrl_handler_free);
805
806/* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
807 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
808 with applications that do not use the NEXT_CTRL flag.
809
810 We just find the n-th private user control. It's O(N), but that should not
811 be an issue in this particular case. */
812static struct v4l2_ctrl_ref *find_private_ref(
813 struct v4l2_ctrl_handler *hdl, u32 id)
814{
815 struct v4l2_ctrl_ref *ref;
816
817 id -= V4L2_CID_PRIVATE_BASE;
818 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
819 /* Search for private user controls that are compatible with
820 VIDIOC_G/S_CTRL. */
821 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
822 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
823 if (!type_is_int(ref->ctrl))
824 continue;
825 if (id == 0)
826 return ref;
827 id--;
828 }
829 }
830 return NULL;
831}
832
833/* Find a control with the given ID. */
834static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
835{
836 struct v4l2_ctrl_ref *ref;
837 int bucket;
838
839 id &= V4L2_CTRL_ID_MASK;
840
841 /* Old-style private controls need special handling */
842 if (id >= V4L2_CID_PRIVATE_BASE)
843 return find_private_ref(hdl, id);
844 bucket = id % hdl->nr_of_buckets;
845
846 /* Simple optimization: cache the last control found */
847 if (hdl->cached && hdl->cached->ctrl->id == id)
848 return hdl->cached;
849
850 /* Not in cache, search the hash */
851 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
852 while (ref && ref->ctrl->id != id)
853 ref = ref->next;
854
855 if (ref)
856 hdl->cached = ref; /* cache it! */
857 return ref;
858}
859
860/* Find a control with the given ID. Take the handler's lock first. */
861static struct v4l2_ctrl_ref *find_ref_lock(
862 struct v4l2_ctrl_handler *hdl, u32 id)
863{
864 struct v4l2_ctrl_ref *ref = NULL;
865
866 if (hdl) {
867 mutex_lock(&hdl->lock);
868 ref = find_ref(hdl, id);
869 mutex_unlock(&hdl->lock);
870 }
871 return ref;
872}
873
874/* Find a control with the given ID. */
875struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
876{
877 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
878
879 return ref ? ref->ctrl : NULL;
880}
881EXPORT_SYMBOL(v4l2_ctrl_find);
882
883/* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
884static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
885 struct v4l2_ctrl *ctrl)
886{
887 struct v4l2_ctrl_ref *ref;
888 struct v4l2_ctrl_ref *new_ref;
889 u32 id = ctrl->id;
890 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
891 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
892
893 /* Automatically add the control class if it is not yet present. */
894 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
895 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
896 return hdl->error;
897
898 if (hdl->error)
899 return hdl->error;
900
901 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
902 if (!new_ref)
903 return handler_set_err(hdl, -ENOMEM);
904 new_ref->ctrl = ctrl;
905 if (ctrl->handler == hdl) {
906 /* By default each control starts in a cluster of its own.
907 new_ref->ctrl is basically a cluster array with one
908 element, so that's perfect to use as the cluster pointer.
909 But only do this for the handler that owns the control. */
910 ctrl->cluster = &new_ref->ctrl;
911 ctrl->ncontrols = 1;
912 }
913
914 INIT_LIST_HEAD(&new_ref->node);
915
916 mutex_lock(&hdl->lock);
917
918 /* Add immediately at the end of the list if the list is empty, or if
919 the last element in the list has a lower ID.
920 This ensures that when elements are added in ascending order the
921 insertion is an O(1) operation. */
922 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
923 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
924 goto insert_in_hash;
925 }
926
927 /* Find insert position in sorted list */
928 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
929 if (ref->ctrl->id < id)
930 continue;
931 /* Don't add duplicates */
932 if (ref->ctrl->id == id) {
933 kfree(new_ref);
934 goto unlock;
935 }
936 list_add(&new_ref->node, ref->node.prev);
937 break;
938 }
939
940insert_in_hash:
941 /* Insert the control node in the hash */
942 new_ref->next = hdl->buckets[bucket];
943 hdl->buckets[bucket] = new_ref;
944
945unlock:
946 mutex_unlock(&hdl->lock);
947 return 0;
948}
949
950/* Add a new control */
951static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
952 const struct v4l2_ctrl_ops *ops,
953 u32 id, const char *name, enum v4l2_ctrl_type type,
954 s32 min, s32 max, u32 step, s32 def,
513521ea 955 u32 flags, const char * const *qmenu, void *priv)
0996517c
HV		 956{
957 struct v4l2_ctrl *ctrl;
958 unsigned sz_extra = 0;
959
960 if (hdl->error)
961 return NULL;
962
963 /* Sanity checks */
964 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
02ac0480 965 max < min ||
0996517c
HV		 966 (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
967 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
968 (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
969 handler_set_err(hdl, -ERANGE);
970 return NULL;
971 }
02ac0480
HV		 972 if ((type == V4L2_CTRL_TYPE_INTEGER ||
973 type == V4L2_CTRL_TYPE_MENU ||
974 type == V4L2_CTRL_TYPE_BOOLEAN) &&
975 (def < min || def > max)) {
976 handler_set_err(hdl, -ERANGE);
977 return NULL;
978 }
0996517c
HV		 979
980 if (type == V4L2_CTRL_TYPE_BUTTON)
981 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
982 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
983 flags |= V4L2_CTRL_FLAG_READ_ONLY;
984 else if (type == V4L2_CTRL_TYPE_STRING)
985 sz_extra += 2 * (max + 1);
986
987 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
988 if (ctrl == NULL) {
989 handler_set_err(hdl, -ENOMEM);
990 return NULL;
991 }
992
993 INIT_LIST_HEAD(&ctrl->node);
994 ctrl->handler = hdl;
995 ctrl->ops = ops;
996 ctrl->id = id;
997 ctrl->name = name;
998 ctrl->type = type;
999 ctrl->flags = flags;
1000 ctrl->minimum = min;
1001 ctrl->maximum = max;
1002 ctrl->step = step;
1003 ctrl->qmenu = qmenu;
1004 ctrl->priv = priv;
1005 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1006
1007 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1008 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1009 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1010 if (ctrl->minimum)
1011 memset(ctrl->cur.string, ' ', ctrl->minimum);
1012 }
1013 if (handler_new_ref(hdl, ctrl)) {
1014 kfree(ctrl);
1015 return NULL;
1016 }
1017 mutex_lock(&hdl->lock);
1018 list_add_tail(&ctrl->node, &hdl->ctrls);
1019 mutex_unlock(&hdl->lock);
1020 return ctrl;
1021}
1022
1023struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1024 const struct v4l2_ctrl_config *cfg, void *priv)
1025{
1026 bool is_menu;
1027 struct v4l2_ctrl *ctrl;
1028 const char *name = cfg->name;
513521ea 1029 const char * const *qmenu = cfg->qmenu;
0996517c
HV		 1030 enum v4l2_ctrl_type type = cfg->type;
1031 u32 flags = cfg->flags;
1032 s32 min = cfg->min;
1033 s32 max = cfg->max;
1034 u32 step = cfg->step;
1035 s32 def = cfg->def;
1036
1037 if (name == NULL)
1038 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1039 &def, &flags);
1040
1041 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU);
1042 if (is_menu)
1043 WARN_ON(step);
1044 else
1045 WARN_ON(cfg->menu_skip_mask);
1046 if (is_menu && qmenu == NULL)
1047 qmenu = v4l2_ctrl_get_menu(cfg->id);
1048
1049 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1050 type, min, max,
1051 is_menu ? cfg->menu_skip_mask : step,
1052 def, flags, qmenu, priv);
1053 if (ctrl) {
1054 ctrl->is_private = cfg->is_private;
1055 ctrl->is_volatile = cfg->is_volatile;
1056 }
1057 return ctrl;
1058}
1059EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1060
1061/* Helper function for standard non-menu controls */
1062struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1063 const struct v4l2_ctrl_ops *ops,
1064 u32 id, s32 min, s32 max, u32 step, s32 def)
1065{
1066 const char *name;
1067 enum v4l2_ctrl_type type;
1068 u32 flags;
1069
1070 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1071 if (type == V4L2_CTRL_TYPE_MENU) {
1072 handler_set_err(hdl, -EINVAL);
1073 return NULL;
1074 }
1075 return v4l2_ctrl_new(hdl, ops, id, name, type,
1076 min, max, step, def, flags, NULL, NULL);
1077}
1078EXPORT_SYMBOL(v4l2_ctrl_new_std);
1079
1080/* Helper function for standard menu controls */
1081struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1082 const struct v4l2_ctrl_ops *ops,
1083 u32 id, s32 max, s32 mask, s32 def)
1084{
513521ea 1085 const char * const *qmenu = v4l2_ctrl_get_menu(id);
0996517c
HV		 1086 const char *name;
1087 enum v4l2_ctrl_type type;
1088 s32 min;
1089 s32 step;
1090 u32 flags;
1091
1092 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1093 if (type != V4L2_CTRL_TYPE_MENU) {
1094 handler_set_err(hdl, -EINVAL);
1095 return NULL;
1096 }
1097 return v4l2_ctrl_new(hdl, ops, id, name, type,
1098 0, max, mask, def, flags, qmenu, NULL);
1099}
1100EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1101
1102/* Add a control from another handler to this handler */
1103struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1104 struct v4l2_ctrl *ctrl)
1105{
1106 if (hdl == NULL || hdl->error)
1107 return NULL;
1108 if (ctrl == NULL) {
1109 handler_set_err(hdl, -EINVAL);
1110 return NULL;
1111 }
1112 if (ctrl->handler == hdl)
1113 return ctrl;
1114 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1115}
1116EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1117
1118/* Add the controls from another handler to our own. */
1119int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1120 struct v4l2_ctrl_handler *add)
1121{
1122 struct v4l2_ctrl *ctrl;
1123 int ret = 0;
1124
1125 /* Do nothing if either handler is NULL or if they are the same */
1126 if (!hdl || !add || hdl == add)
1127 return 0;
1128 if (hdl->error)
1129 return hdl->error;
1130 mutex_lock(&add->lock);
1131 list_for_each_entry(ctrl, &add->ctrls, node) {
1132 /* Skip handler-private controls. */
1133 if (ctrl->is_private)
1134 continue;
1135 ret = handler_new_ref(hdl, ctrl);
1136 if (ret)
1137 break;
1138 }
1139 mutex_unlock(&add->lock);
1140 return ret;
1141}
1142EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1143
1144/* Cluster controls */
1145void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1146{
1147 int i;
1148
1149 /* The first control is the master control and it must not be NULL */
1150 BUG_ON(controls[0] == NULL);
1151
1152 for (i = 0; i < ncontrols; i++) {
1153 if (controls[i]) {
1154 controls[i]->cluster = controls;
1155 controls[i]->ncontrols = ncontrols;
1156 }
1157 }
1158}
1159EXPORT_SYMBOL(v4l2_ctrl_cluster);
1160
1161/* Activate/deactivate a control. */
1162void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1163{
1164 if (ctrl == NULL)
1165 return;
1166
1167 if (!active)
1168 /* set V4L2_CTRL_FLAG_INACTIVE */
1169 set_bit(4, &ctrl->flags);
1170 else
1171 /* clear V4L2_CTRL_FLAG_INACTIVE */
1172 clear_bit(4, &ctrl->flags);
1173}
1174EXPORT_SYMBOL(v4l2_ctrl_activate);
1175
1176/* Grab/ungrab a control.
1177 Typically used when streaming starts and you want to grab controls,
1178 preventing the user from changing them.
1179
1180 Just call this and the framework will block any attempts to change
1181 these controls. */
1182void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1183{
1184 if (ctrl == NULL)
1185 return;
1186
1187 if (grabbed)
1188 /* set V4L2_CTRL_FLAG_GRABBED */
1189 set_bit(1, &ctrl->flags);
1190 else
1191 /* clear V4L2_CTRL_FLAG_GRABBED */
1192 clear_bit(1, &ctrl->flags);
1193}
1194EXPORT_SYMBOL(v4l2_ctrl_grab);
1195
1196/* Log the control name and value */
1197static void log_ctrl(const struct v4l2_ctrl *ctrl,
1198 const char *prefix, const char *colon)
1199{
1200 int fl_inact = ctrl->flags & V4L2_CTRL_FLAG_INACTIVE;
1201 int fl_grabbed = ctrl->flags & V4L2_CTRL_FLAG_GRABBED;
1202
1203 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1204 return;
1205 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1206 return;
1207
1208 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1209
1210 switch (ctrl->type) {
1211 case V4L2_CTRL_TYPE_INTEGER:
1212 printk(KERN_CONT "%d", ctrl->cur.val);
1213 break;
1214 case V4L2_CTRL_TYPE_BOOLEAN:
1215 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1216 break;
1217 case V4L2_CTRL_TYPE_MENU:
1218 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1219 break;
1220 case V4L2_CTRL_TYPE_INTEGER64:
1221 printk(KERN_CONT "%lld", ctrl->cur.val64);
1222 break;
1223 case V4L2_CTRL_TYPE_STRING:
1224 printk(KERN_CONT "%s", ctrl->cur.string);
1225 break;
1226 default:
1227 printk(KERN_CONT "unknown type %d", ctrl->type);
1228 break;
1229 }
1230 if (fl_inact && fl_grabbed)
1231 printk(KERN_CONT " (inactive, grabbed)\n");
1232 else if (fl_inact)
1233 printk(KERN_CONT " (inactive)\n");
1234 else if (fl_grabbed)
1235 printk(KERN_CONT " (grabbed)\n");
1236 else
1237 printk(KERN_CONT "\n");
1238}
1239
1240/* Log all controls owned by the handler */
1241void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1242 const char *prefix)
1243{
1244 struct v4l2_ctrl *ctrl;
1245 const char *colon = "";
1246 int len;
1247
1248 if (hdl == NULL)
1249 return;
1250 if (prefix == NULL)
1251 prefix = "";
1252 len = strlen(prefix);
1253 if (len && prefix[len - 1] != ' ')
1254 colon = ": ";
1255 mutex_lock(&hdl->lock);
1256 list_for_each_entry(ctrl, &hdl->ctrls, node)
1257 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1258 log_ctrl(ctrl, prefix, colon);
1259 mutex_unlock(&hdl->lock);
1260}
1261EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1262
1263/* Call s_ctrl for all controls owned by the handler */
1264int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1265{
1266 struct v4l2_ctrl *ctrl;
1267 int ret = 0;
1268
1269 if (hdl == NULL)
1270 return 0;
1271 mutex_lock(&hdl->lock);
1272 list_for_each_entry(ctrl, &hdl->ctrls, node)
1273 ctrl->done = false;
1274
1275 list_for_each_entry(ctrl, &hdl->ctrls, node) {
1276 struct v4l2_ctrl *master = ctrl->cluster[0];
1277 int i;
1278
1279 /* Skip if this control was already handled by a cluster. */
1280 if (ctrl->done)
1281 continue;
1282
1283 for (i = 0; i < master->ncontrols; i++)
1284 cur_to_new(master->cluster[i]);
1285
1286 /* Skip button controls and read-only controls. */
1287 if (ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1288 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
1289 continue;
1290 ret = master->ops->s_ctrl(master);
1291 if (ret)
1292 break;
1293 for (i = 0; i < master->ncontrols; i++)
1294 if (master->cluster[i])
1295 master->cluster[i]->done = true;
1296 }
1297 mutex_unlock(&hdl->lock);
1298 return ret;
1299}
1300EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1301
1302/* Implement VIDIOC_QUERYCTRL */
1303int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1304{
1305 u32 id = qc->id & V4L2_CTRL_ID_MASK;
1306 struct v4l2_ctrl_ref *ref;
1307 struct v4l2_ctrl *ctrl;
1308
1309 if (hdl == NULL)
1310 return -EINVAL;
1311
1312 mutex_lock(&hdl->lock);
1313
1314 /* Try to find it */
1315 ref = find_ref(hdl, id);
1316
1317 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1318 /* Find the next control with ID > qc->id */
1319
1320 /* Did we reach the end of the control list? */
1321 if (id >= node2id(hdl->ctrl_refs.prev)) {
1322 ref = NULL; /* Yes, so there is no next control */
1323 } else if (ref) {
1324 /* We found a control with the given ID, so just get
1325 the next one in the list. */
1326 ref = list_entry(ref->node.next, typeof(*ref), node);
1327 } else {
1328 /* No control with the given ID exists, so start
1329 searching for the next largest ID. We know there
1330 is one, otherwise the first 'if' above would have
1331 been true. */
1332 list_for_each_entry(ref, &hdl->ctrl_refs, node)
1333 if (id < ref->ctrl->id)
1334 break;
1335 }
1336 }
1337 mutex_unlock(&hdl->lock);
1338 if (!ref)
1339 return -EINVAL;
1340
1341 ctrl = ref->ctrl;
1342 memset(qc, 0, sizeof(*qc));
1343 qc->id = ctrl->id;
1344 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1345 qc->minimum = ctrl->minimum;
1346 qc->maximum = ctrl->maximum;
1347 qc->default_value = ctrl->default_value;
1348 if (qc->type == V4L2_CTRL_TYPE_MENU)
1349 qc->step = 1;
1350 else
1351 qc->step = ctrl->step;
1352 qc->flags = ctrl->flags;
1353 qc->type = ctrl->type;
1354 return 0;
1355}
1356EXPORT_SYMBOL(v4l2_queryctrl);
1357
1358int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1359{
1360 return v4l2_queryctrl(sd->ctrl_handler, qc);
1361}
1362EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1363
1364/* Implement VIDIOC_QUERYMENU */
1365int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1366{
1367 struct v4l2_ctrl *ctrl;
1368 u32 i = qm->index;
1369
1370 ctrl = v4l2_ctrl_find(hdl, qm->id);
1371 if (!ctrl)
1372 return -EINVAL;
1373
1374 qm->reserved = 0;
1375 /* Sanity checks */
1376 if (ctrl->qmenu == NULL ||
1377 i < ctrl->minimum || i > ctrl->maximum)
1378 return -EINVAL;
1379 /* Use mask to see if this menu item should be skipped */
1380 if (ctrl->menu_skip_mask & (1 << i))
1381 return -EINVAL;
1382 /* Empty menu items should also be skipped */
1383 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
1384 return -EINVAL;
1385 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
1386 return 0;
1387}
1388EXPORT_SYMBOL(v4l2_querymenu);
1389
1390int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
1391{
1392 return v4l2_querymenu(sd->ctrl_handler, qm);
1393}
1394EXPORT_SYMBOL(v4l2_subdev_querymenu);
1395
1396
1397
1398/* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
1399
1400 It is not a fully atomic operation, just best-effort only. After all, if
1401 multiple controls have to be set through multiple i2c writes (for example)
1402 then some initial writes may succeed while others fail. Thus leaving the
1403 system in an inconsistent state. The question is how much effort you are
1404 willing to spend on trying to make something atomic that really isn't.
1405
1406 From the point of view of an application the main requirement is that
1407 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
1408 error should be returned without actually affecting any controls.
1409
1410 If all the values are correct, then it is acceptable to just give up
1411 in case of low-level errors.
1412
1413 It is important though that the application can tell when only a partial
1414 configuration was done. The way we do that is through the error_idx field
1415 of struct v4l2_ext_controls: if that is equal to the count field then no
1416 controls were affected. Otherwise all controls before that index were
1417 successful in performing their 'get' or 'set' operation, the control at
1418 the given index failed, and you don't know what happened with the controls
1419 after the failed one. Since if they were part of a control cluster they
1420 could have been successfully processed (if a cluster member was encountered
1421 at index < error_idx), they could have failed (if a cluster member was at
1422 error_idx), or they may not have been processed yet (if the first cluster
1423 member appeared after error_idx).
1424
1425 It is all fairly theoretical, though. In practice all you can do is to
1426 bail out. If error_idx == count, then it is an application bug. If
1427 error_idx < count then it is only an application bug if the error code was
1428 EBUSY. That usually means that something started streaming just when you
1429 tried to set the controls. In all other cases it is a driver/hardware
1430 problem and all you can do is to retry or bail out.
1431
1432 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
1433 never modifies controls the error_idx is just set to whatever control
1434 has an invalid value.
1435 */
1436
1437/* Prepare for the extended g/s/try functions.
1438 Find the controls in the control array and do some basic checks. */
1439static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1440 struct v4l2_ext_controls *cs,
1441 struct ctrl_helper *helpers,
1442 bool try)
1443{
1444 u32 i;
1445
1446 for (i = 0; i < cs->count; i++) {
1447 struct v4l2_ext_control *c = &cs->controls[i];
1448 struct v4l2_ctrl *ctrl;
1449 u32 id = c->id & V4L2_CTRL_ID_MASK;
1450
1451 if (try)
1452 cs->error_idx = i;
1453
1454 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
1455 return -EINVAL;
1456
1457 /* Old-style private controls are not allowed for
1458 extended controls */
1459 if (id >= V4L2_CID_PRIVATE_BASE)
1460 return -EINVAL;
1461 ctrl = v4l2_ctrl_find(hdl, id);
1462 if (ctrl == NULL)
1463 return -EINVAL;
1464 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
1465 return -EINVAL;
1466
1467 helpers[i].ctrl = ctrl;
1468 helpers[i].handled = false;
1469 }
1470 return 0;
1471}
1472
1473typedef int (*cluster_func)(struct v4l2_ext_control *c,
1474 struct v4l2_ctrl *ctrl);
1475
1476/* Walk over all controls in v4l2_ext_controls belonging to the same cluster
1477 and call the provided function. */
1478static int cluster_walk(unsigned from,
1479 struct v4l2_ext_controls *cs,
1480 struct ctrl_helper *helpers,
1481 cluster_func f)
1482{
1483 struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster;
1484 int ret = 0;
1485 int i;
1486
1487 /* Find any controls from the same cluster and call the function */
1488 for (i = from; !ret && i < cs->count; i++) {
1489 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1490
1491 if (!helpers[i].handled && ctrl->cluster == cluster)
1492 ret = f(&cs->controls[i], ctrl);
1493 }
1494 return ret;
1495}
1496
1497static void cluster_done(unsigned from,
1498 struct v4l2_ext_controls *cs,
1499 struct ctrl_helper *helpers)
1500{
1501 struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster;
1502 int i;
1503
1504 /* Find any controls from the same cluster and mark them as handled */
1505 for (i = from; i < cs->count; i++)
1506 if (helpers[i].ctrl->cluster == cluster)
1507 helpers[i].handled = true;
1508}
1509
1510/* Handles the corner case where cs->count == 0. It checks whether the
1511 specified control class exists. If that class ID is 0, then it checks
1512 whether there are any controls at all. */
1513static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
1514{
1515 if (ctrl_class == 0)
1516 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
1517 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
1518}
1519
1520
1521
1522/* Get extended controls. Allocates the helpers array if needed. */
1523int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1524{
1525 struct ctrl_helper helper[4];
1526 struct ctrl_helper *helpers = helper;
1527 int ret;
1528 int i;
1529
1530 cs->error_idx = cs->count;
1531 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1532
1533 if (hdl == NULL)
1534 return -EINVAL;
1535
1536 if (cs->count == 0)
1537 return class_check(hdl, cs->ctrl_class);
1538
1539 if (cs->count > ARRAY_SIZE(helper)) {
1540 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1541 if (helpers == NULL)
1542 return -ENOMEM;
1543 }
1544
1545 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
1546
1547 for (i = 0; !ret && i < cs->count; i++)
1548 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1549 ret = -EACCES;
1550
1551 for (i = 0; !ret && i < cs->count; i++) {
1552 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1553 struct v4l2_ctrl *master = ctrl->cluster[0];
1554
1555 if (helpers[i].handled)
1556 continue;
1557
1558 cs->error_idx = i;
1559
1560 v4l2_ctrl_lock(master);
1561 /* g_volatile_ctrl will update the current control values */
1562 if (ctrl->is_volatile && master->ops->g_volatile_ctrl)
1563 ret = master->ops->g_volatile_ctrl(master);
1564 /* If OK, then copy the current control values to the caller */
1565 if (!ret)
1566 ret = cluster_walk(i, cs, helpers, cur_to_user);
1567 v4l2_ctrl_unlock(master);
1568 cluster_done(i, cs, helpers);
1569 }
1570
1571 if (cs->count > ARRAY_SIZE(helper))
1572 kfree(helpers);
1573 return ret;
1574}
1575EXPORT_SYMBOL(v4l2_g_ext_ctrls);
1576
1577int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1578{
1579 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
1580}
1581EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
1582
1583/* Helper function to get a single control */
1584static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
1585{
1586 struct v4l2_ctrl *master = ctrl->cluster[0];
1587 int ret = 0;
1588
1589 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1590 return -EACCES;
1591
1592 v4l2_ctrl_lock(master);
1593 /* g_volatile_ctrl will update the current control values */
1594 if (ctrl->is_volatile && master->ops->g_volatile_ctrl)
1595 ret = master->ops->g_volatile_ctrl(master);
1596 *val = ctrl->cur.val;
1597 v4l2_ctrl_unlock(master);
1598 return ret;
1599}
1600
1601int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
1602{
1603 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
1604
1605 if (ctrl == NULL || !type_is_int(ctrl))
1606 return -EINVAL;
1607 return get_ctrl(ctrl, &control->value);
1608}
1609EXPORT_SYMBOL(v4l2_g_ctrl);
1610
1611int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
1612{
1613 return v4l2_g_ctrl(sd->ctrl_handler, control);
1614}
1615EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
1616
1617s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
1618{
1619 s32 val = 0;
1620
1621 /* It's a driver bug if this happens. */
1622 WARN_ON(!type_is_int(ctrl));
1623 get_ctrl(ctrl, &val);
1624 return val;
1625}
1626EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
1627
1628
1629/* Core function that calls try/s_ctrl and ensures that the new value is
1630 copied to the current value on a set.
1631 Must be called with ctrl->handler->lock held. */
1632static int try_or_set_control_cluster(struct v4l2_ctrl *master, bool set)
1633{
1634 bool try = !set;
1635 int ret = 0;
1636 int i;
1637
1638 /* Go through the cluster and either validate the new value or
1639 (if no new value was set), copy the current value to the new
1640 value, ensuring a consistent view for the control ops when
1641 called. */
1642 for (i = 0; !ret && i < master->ncontrols; i++) {
1643 struct v4l2_ctrl *ctrl = master->cluster[i];
1644
1645 if (ctrl == NULL)
1646 continue;
1647
1648 if (ctrl->has_new) {
1649 /* Double check this: it may have changed since the
1650 last check in try_or_set_ext_ctrls(). */
1651 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
1652 return -EBUSY;
1653
1654 /* Validate if required */
1655 if (!set)
1656 ret = validate_new(ctrl);
1657 continue;
1658 }
1659 /* No new value was set, so copy the current and force
1660 a call to try_ctrl later, since the values for the cluster
1661 may now have changed and the end result might be invalid. */
1662 try = true;
1663 cur_to_new(ctrl);
1664 }
1665
1666 /* For larger clusters you have to call try_ctrl again to
1667 verify that the controls are still valid after the
1668 'cur_to_new' above. */
1669 if (!ret && master->ops->try_ctrl && try)
1670 ret = master->ops->try_ctrl(master);
1671
1672 /* Don't set if there is no change */
1673 if (!ret && set && cluster_changed(master)) {
1674 ret = master->ops->s_ctrl(master);
1675 /* If OK, then make the new values permanent. */
1676 if (!ret)
1677 for (i = 0; i < master->ncontrols; i++)
1678 new_to_cur(master->cluster[i]);
1679 }
1680 return ret;
1681}
1682
1683/* Try or set controls. */
1684static int try_or_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1685 struct v4l2_ext_controls *cs,
1686 struct ctrl_helper *helpers,
1687 bool set)
1688{
1689 unsigned i, j;
1690 int ret = 0;
1691
1692 cs->error_idx = cs->count;
1693 for (i = 0; i < cs->count; i++) {
1694 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1695
1696 if (!set)
1697 cs->error_idx = i;
1698
1699 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
1700 return -EACCES;
1701 /* This test is also done in try_set_control_cluster() which
1702 is called in atomic context, so that has the final say,
1703 but it makes sense to do an up-front check as well. Once
1704 an error occurs in try_set_control_cluster() some other
1705 controls may have been set already and we want to do a
1706 best-effort to avoid that. */
1707 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
1708 return -EBUSY;
1709 }
1710
1711 for (i = 0; !ret && i < cs->count; i++) {
1712 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1713 struct v4l2_ctrl *master = ctrl->cluster[0];
1714
1715 cs->error_idx = i;
1716
1717 if (helpers[i].handled)
1718 continue;
1719
1720 v4l2_ctrl_lock(ctrl);
1721
1722 /* Reset the 'has_new' flags of the cluster */
1723 for (j = 0; j < master->ncontrols; j++)
1724 if (master->cluster[j])
1725 master->cluster[j]->has_new = 0;
1726
1727 /* Copy the new caller-supplied control values.
1728 user_to_new() sets 'has_new' to 1. */
1729 ret = cluster_walk(i, cs, helpers, user_to_new);
1730
1731 if (!ret)
1732 ret = try_or_set_control_cluster(master, set);
1733
1734 /* Copy the new values back to userspace. */
1735 if (!ret)
1736 ret = cluster_walk(i, cs, helpers, new_to_user);
1737
1738 v4l2_ctrl_unlock(ctrl);
1739 cluster_done(i, cs, helpers);
1740 }
1741 return ret;
1742}
1743
1744/* Try or try-and-set controls */
1745static int try_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1746 struct v4l2_ext_controls *cs,
1747 bool set)
1748{
1749 struct ctrl_helper helper[4];
1750 struct ctrl_helper *helpers = helper;
1751 int ret;
1752 int i;
1753
1754 cs->error_idx = cs->count;
1755 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1756
1757 if (hdl == NULL)
1758 return -EINVAL;
1759
1760 if (cs->count == 0)
1761 return class_check(hdl, cs->ctrl_class);
1762
1763 if (cs->count > ARRAY_SIZE(helper)) {
1764 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1765 if (!helpers)
1766 return -ENOMEM;
1767 }
1768 ret = prepare_ext_ctrls(hdl, cs, helpers, !set);
1769 if (ret)
1770 goto free;
1771
1772 /* First 'try' all controls and abort on error */
1773 ret = try_or_set_ext_ctrls(hdl, cs, helpers, false);
1774 /* If this is a 'set' operation and the initial 'try' failed,
1775 then set error_idx to count to tell the application that no
1776 controls changed value yet. */
1777 if (set)
1778 cs->error_idx = cs->count;
1779 if (!ret && set) {
1780 /* Reset 'handled' state */
1781 for (i = 0; i < cs->count; i++)
1782 helpers[i].handled = false;
1783 ret = try_or_set_ext_ctrls(hdl, cs, helpers, true);
1784 }
1785
1786free:
1787 if (cs->count > ARRAY_SIZE(helper))
1788 kfree(helpers);
1789 return ret;
1790}
1791
1792int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1793{
1794 return try_set_ext_ctrls(hdl, cs, false);
1795}
1796EXPORT_SYMBOL(v4l2_try_ext_ctrls);
1797
1798int v4l2_s_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1799{
1800 return try_set_ext_ctrls(hdl, cs, true);
1801}
1802EXPORT_SYMBOL(v4l2_s_ext_ctrls);
1803
1804int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1805{
1806 return try_set_ext_ctrls(sd->ctrl_handler, cs, false);
1807}
1808EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
1809
1810int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1811{
1812 return try_set_ext_ctrls(sd->ctrl_handler, cs, true);
1813}
1814EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
1815
1816/* Helper function for VIDIOC_S_CTRL compatibility */
1817static int set_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
1818{
1819 struct v4l2_ctrl *master = ctrl->cluster[0];
1820 int ret;
1821 int i;
1822
1823 v4l2_ctrl_lock(ctrl);
1824
1825 /* Reset the 'has_new' flags of the cluster */
1826 for (i = 0; i < master->ncontrols; i++)
1827 if (master->cluster[i])
1828 master->cluster[i]->has_new = 0;
1829
1830 ctrl->val = *val;
1831 ctrl->has_new = 1;
1832 ret = try_or_set_control_cluster(master, false);
1833 if (!ret)
1834 ret = try_or_set_control_cluster(master, true);
1835 *val = ctrl->cur.val;
1836 v4l2_ctrl_unlock(ctrl);
1837 return ret;
1838}
1839
1840int v4l2_s_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
1841{
1842 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
1843
1844 if (ctrl == NULL || !type_is_int(ctrl))
1845 return -EINVAL;
1846
1847 return set_ctrl(ctrl, &control->value);
1848}
1849EXPORT_SYMBOL(v4l2_s_ctrl);
1850
1851int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
1852{
1853 return v4l2_s_ctrl(sd->ctrl_handler, control);
1854}
1855EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
1856
1857int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
1858{
1859 /* It's a driver bug if this happens. */
1860 WARN_ON(!type_is_int(ctrl));
1861 return set_ctrl(ctrl, &val);
1862}
1863EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
Linux 6.x block layer and io_uring tree(s)