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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus
[mirror_ubuntu-bionic-kernel.git] / drivers / media / video / v4l2-ctrls.c
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 <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 */
29 struct 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. */
41 const char * const *v4l2_ctrl_get_menu(u32 id)
42 {
43 static const char * const mpeg_audio_sampling_freq[] = {
44 "44.1 kHz",
45 "48 kHz",
46 "32 kHz",
47 NULL
48 };
49 static const char * const mpeg_audio_encoding[] = {
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 };
57 static const char * const mpeg_audio_l1_bitrate[] = {
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 };
74 static const char * const mpeg_audio_l2_bitrate[] = {
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 };
91 static const char * const mpeg_audio_l3_bitrate[] = {
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 };
108 static const char * const mpeg_audio_ac3_bitrate[] = {
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 };
130 static const char * const mpeg_audio_mode[] = {
131 "Stereo",
132 "Joint Stereo",
133 "Dual",
134 "Mono",
135 NULL
136 };
137 static const char * const mpeg_audio_mode_extension[] = {
138 "Bound 4",
139 "Bound 8",
140 "Bound 12",
141 "Bound 16",
142 NULL
143 };
144 static const char * const mpeg_audio_emphasis[] = {
145 "No Emphasis",
146 "50/15 us",
147 "CCITT J17",
148 NULL
149 };
150 static const char * const mpeg_audio_crc[] = {
151 "No CRC",
152 "16-bit CRC",
153 NULL
154 };
155 static const char * const mpeg_video_encoding[] = {
156 "MPEG-1",
157 "MPEG-2",
158 "MPEG-4 AVC",
159 NULL
160 };
161 static const char * const mpeg_video_aspect[] = {
162 "1x1",
163 "4x3",
164 "16x9",
165 "2.21x1",
166 NULL
167 };
168 static const char * const mpeg_video_bitrate_mode[] = {
169 "Variable Bitrate",
170 "Constant Bitrate",
171 NULL
172 };
173 static const char * const mpeg_stream_type[] = {
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 };
182 static const char * const mpeg_stream_vbi_fmt[] = {
183 "No VBI",
184 "Private packet, IVTV format",
185 NULL
186 };
187 static const char * const camera_power_line_frequency[] = {
188 "Disabled",
189 "50 Hz",
190 "60 Hz",
191 NULL
192 };
193 static const char * const camera_exposure_auto[] = {
194 "Auto Mode",
195 "Manual Mode",
196 "Shutter Priority Mode",
197 "Aperture Priority Mode",
198 NULL
199 };
200 static const char * const colorfx[] = {
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 };
213 static const char * const tune_preemphasis[] = {
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 }
263 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
264
265 /* Return the control name. */
266 const char *v4l2_ctrl_get_name(u32 id)
267 {
268 switch (id) {
269 /* USER controls */
270 /* Keep the order of the 'case's the same as in videodev2.h! */
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";
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";
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";
307 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
308 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
309 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
310
311 /* MPEG controls */
312 /* Keep the order of the 'case's the same as in videodev2.h! */
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";
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";
322 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
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";
328 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
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";
343 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
344 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
345 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
346
347 /* CAMERA controls */
348 /* Keep the order of the 'case's the same as in videodev2.h! */
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";
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";
366 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
367 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
368
369 /* FM Radio Modulator control */
370 /* Keep the order of the 'case's the same as in videodev2.h! */
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 }
396 EXPORT_SYMBOL(v4l2_ctrl_get_name);
397
398 void 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:
424 case V4L2_CID_ILLUMINATORS_1:
425 case V4L2_CID_ILLUMINATORS_2:
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 }
524 EXPORT_SYMBOL(v4l2_ctrl_fill);
525
526 /* Helper function to determine whether the control type is compatible with
527 VIDIOC_G/S_CTRL. */
528 static 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 */
541 static 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 */
566 static int user_to_new(struct v4l2_ext_control *c,
567 struct v4l2_ctrl *ctrl)
568 {
569 int ret;
570 u32 size;
571
572 ctrl->is_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 */
602 static 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. */
627 static 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 */
646 static 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. */
666 static 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 */
696 static 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
750 static 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 */
756 static 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 */
764 int 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 }
776 EXPORT_SYMBOL(v4l2_ctrl_handler_init);
777
778 /* Free all controls and control refs */
779 void 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 }
804 EXPORT_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. */
812 static 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. */
834 static 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. */
861 static 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. */
875 struct 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 }
881 EXPORT_SYMBOL(v4l2_ctrl_find);
882
883 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
884 static 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
940 insert_in_hash:
941 /* Insert the control node in the hash */
942 new_ref->next = hdl->buckets[bucket];
943 hdl->buckets[bucket] = new_ref;
944
945 unlock:
946 mutex_unlock(&hdl->lock);
947 return 0;
948 }
949
950 /* Add a new control */
951 static 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,
955 u32 flags, const char * const *qmenu, void *priv)
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 ||
965 max < min ||
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 }
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 }
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
1023 struct 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;
1029 const char * const *qmenu = cfg->qmenu;
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 }
1059 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1060
1061 /* Helper function for standard non-menu controls */
1062 struct 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 }
1078 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1079
1080 /* Helper function for standard menu controls */
1081 struct 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 {
1085 const char * const *qmenu = v4l2_ctrl_get_menu(id);
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 }
1100 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1101
1102 /* Add a control from another handler to this handler */
1103 struct 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 }
1116 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1117
1118 /* Add the controls from another handler to our own. */
1119 int 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 }
1142 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1143
1144 /* Cluster controls */
1145 void 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 }
1159 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1160
1161 /* Activate/deactivate a control. */
1162 void 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 }
1174 EXPORT_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. */
1182 void 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 }
1194 EXPORT_SYMBOL(v4l2_ctrl_grab);
1195
1196 /* Log the control name and value */
1197 static 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 */
1241 void 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 }
1261 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1262
1263 /* Call s_ctrl for all controls owned by the handler */
1264 int 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 if (master->cluster[i]) {
1285 cur_to_new(master->cluster[i]);
1286 master->cluster[i]->is_new = 1;
1287 }
1288 }
1289
1290 /* Skip button controls and read-only controls. */
1291 if (ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1292 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
1293 continue;
1294 ret = master->ops->s_ctrl(master);
1295 if (ret)
1296 break;
1297 for (i = 0; i < master->ncontrols; i++)
1298 if (master->cluster[i])
1299 master->cluster[i]->done = true;
1300 }
1301 mutex_unlock(&hdl->lock);
1302 return ret;
1303 }
1304 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1305
1306 /* Implement VIDIOC_QUERYCTRL */
1307 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1308 {
1309 u32 id = qc->id & V4L2_CTRL_ID_MASK;
1310 struct v4l2_ctrl_ref *ref;
1311 struct v4l2_ctrl *ctrl;
1312
1313 if (hdl == NULL)
1314 return -EINVAL;
1315
1316 mutex_lock(&hdl->lock);
1317
1318 /* Try to find it */
1319 ref = find_ref(hdl, id);
1320
1321 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1322 /* Find the next control with ID > qc->id */
1323
1324 /* Did we reach the end of the control list? */
1325 if (id >= node2id(hdl->ctrl_refs.prev)) {
1326 ref = NULL; /* Yes, so there is no next control */
1327 } else if (ref) {
1328 /* We found a control with the given ID, so just get
1329 the next one in the list. */
1330 ref = list_entry(ref->node.next, typeof(*ref), node);
1331 } else {
1332 /* No control with the given ID exists, so start
1333 searching for the next largest ID. We know there
1334 is one, otherwise the first 'if' above would have
1335 been true. */
1336 list_for_each_entry(ref, &hdl->ctrl_refs, node)
1337 if (id < ref->ctrl->id)
1338 break;
1339 }
1340 }
1341 mutex_unlock(&hdl->lock);
1342 if (!ref)
1343 return -EINVAL;
1344
1345 ctrl = ref->ctrl;
1346 memset(qc, 0, sizeof(*qc));
1347 if (id >= V4L2_CID_PRIVATE_BASE)
1348 qc->id = id;
1349 else
1350 qc->id = ctrl->id;
1351 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1352 qc->minimum = ctrl->minimum;
1353 qc->maximum = ctrl->maximum;
1354 qc->default_value = ctrl->default_value;
1355 if (ctrl->type == V4L2_CTRL_TYPE_MENU)
1356 qc->step = 1;
1357 else
1358 qc->step = ctrl->step;
1359 qc->flags = ctrl->flags;
1360 qc->type = ctrl->type;
1361 return 0;
1362 }
1363 EXPORT_SYMBOL(v4l2_queryctrl);
1364
1365 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1366 {
1367 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
1368 return -EINVAL;
1369 return v4l2_queryctrl(sd->ctrl_handler, qc);
1370 }
1371 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1372
1373 /* Implement VIDIOC_QUERYMENU */
1374 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1375 {
1376 struct v4l2_ctrl *ctrl;
1377 u32 i = qm->index;
1378
1379 ctrl = v4l2_ctrl_find(hdl, qm->id);
1380 if (!ctrl)
1381 return -EINVAL;
1382
1383 qm->reserved = 0;
1384 /* Sanity checks */
1385 if (ctrl->qmenu == NULL ||
1386 i < ctrl->minimum || i > ctrl->maximum)
1387 return -EINVAL;
1388 /* Use mask to see if this menu item should be skipped */
1389 if (ctrl->menu_skip_mask & (1 << i))
1390 return -EINVAL;
1391 /* Empty menu items should also be skipped */
1392 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
1393 return -EINVAL;
1394 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
1395 return 0;
1396 }
1397 EXPORT_SYMBOL(v4l2_querymenu);
1398
1399 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
1400 {
1401 return v4l2_querymenu(sd->ctrl_handler, qm);
1402 }
1403 EXPORT_SYMBOL(v4l2_subdev_querymenu);
1404
1405
1406
1407 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
1408
1409 It is not a fully atomic operation, just best-effort only. After all, if
1410 multiple controls have to be set through multiple i2c writes (for example)
1411 then some initial writes may succeed while others fail. Thus leaving the
1412 system in an inconsistent state. The question is how much effort you are
1413 willing to spend on trying to make something atomic that really isn't.
1414
1415 From the point of view of an application the main requirement is that
1416 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
1417 error should be returned without actually affecting any controls.
1418
1419 If all the values are correct, then it is acceptable to just give up
1420 in case of low-level errors.
1421
1422 It is important though that the application can tell when only a partial
1423 configuration was done. The way we do that is through the error_idx field
1424 of struct v4l2_ext_controls: if that is equal to the count field then no
1425 controls were affected. Otherwise all controls before that index were
1426 successful in performing their 'get' or 'set' operation, the control at
1427 the given index failed, and you don't know what happened with the controls
1428 after the failed one. Since if they were part of a control cluster they
1429 could have been successfully processed (if a cluster member was encountered
1430 at index < error_idx), they could have failed (if a cluster member was at
1431 error_idx), or they may not have been processed yet (if the first cluster
1432 member appeared after error_idx).
1433
1434 It is all fairly theoretical, though. In practice all you can do is to
1435 bail out. If error_idx == count, then it is an application bug. If
1436 error_idx < count then it is only an application bug if the error code was
1437 EBUSY. That usually means that something started streaming just when you
1438 tried to set the controls. In all other cases it is a driver/hardware
1439 problem and all you can do is to retry or bail out.
1440
1441 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
1442 never modifies controls the error_idx is just set to whatever control
1443 has an invalid value.
1444 */
1445
1446 /* Prepare for the extended g/s/try functions.
1447 Find the controls in the control array and do some basic checks. */
1448 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1449 struct v4l2_ext_controls *cs,
1450 struct ctrl_helper *helpers,
1451 bool try)
1452 {
1453 u32 i;
1454
1455 for (i = 0; i < cs->count; i++) {
1456 struct v4l2_ext_control *c = &cs->controls[i];
1457 struct v4l2_ctrl *ctrl;
1458 u32 id = c->id & V4L2_CTRL_ID_MASK;
1459
1460 if (try)
1461 cs->error_idx = i;
1462
1463 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
1464 return -EINVAL;
1465
1466 /* Old-style private controls are not allowed for
1467 extended controls */
1468 if (id >= V4L2_CID_PRIVATE_BASE)
1469 return -EINVAL;
1470 ctrl = v4l2_ctrl_find(hdl, id);
1471 if (ctrl == NULL)
1472 return -EINVAL;
1473 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
1474 return -EINVAL;
1475
1476 helpers[i].ctrl = ctrl;
1477 helpers[i].handled = false;
1478 }
1479 return 0;
1480 }
1481
1482 typedef int (*cluster_func)(struct v4l2_ext_control *c,
1483 struct v4l2_ctrl *ctrl);
1484
1485 /* Walk over all controls in v4l2_ext_controls belonging to the same cluster
1486 and call the provided function. */
1487 static int cluster_walk(unsigned from,
1488 struct v4l2_ext_controls *cs,
1489 struct ctrl_helper *helpers,
1490 cluster_func f)
1491 {
1492 struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster;
1493 int ret = 0;
1494 int i;
1495
1496 /* Find any controls from the same cluster and call the function */
1497 for (i = from; !ret && i < cs->count; i++) {
1498 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1499
1500 if (!helpers[i].handled && ctrl->cluster == cluster)
1501 ret = f(&cs->controls[i], ctrl);
1502 }
1503 return ret;
1504 }
1505
1506 static void cluster_done(unsigned from,
1507 struct v4l2_ext_controls *cs,
1508 struct ctrl_helper *helpers)
1509 {
1510 struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster;
1511 int i;
1512
1513 /* Find any controls from the same cluster and mark them as handled */
1514 for (i = from; i < cs->count; i++)
1515 if (helpers[i].ctrl->cluster == cluster)
1516 helpers[i].handled = true;
1517 }
1518
1519 /* Handles the corner case where cs->count == 0. It checks whether the
1520 specified control class exists. If that class ID is 0, then it checks
1521 whether there are any controls at all. */
1522 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
1523 {
1524 if (ctrl_class == 0)
1525 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
1526 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
1527 }
1528
1529
1530
1531 /* Get extended controls. Allocates the helpers array if needed. */
1532 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1533 {
1534 struct ctrl_helper helper[4];
1535 struct ctrl_helper *helpers = helper;
1536 int ret;
1537 int i;
1538
1539 cs->error_idx = cs->count;
1540 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1541
1542 if (hdl == NULL)
1543 return -EINVAL;
1544
1545 if (cs->count == 0)
1546 return class_check(hdl, cs->ctrl_class);
1547
1548 if (cs->count > ARRAY_SIZE(helper)) {
1549 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1550 if (helpers == NULL)
1551 return -ENOMEM;
1552 }
1553
1554 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
1555
1556 for (i = 0; !ret && i < cs->count; i++)
1557 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1558 ret = -EACCES;
1559
1560 for (i = 0; !ret && i < cs->count; i++) {
1561 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1562 struct v4l2_ctrl *master = ctrl->cluster[0];
1563
1564 if (helpers[i].handled)
1565 continue;
1566
1567 cs->error_idx = i;
1568
1569 v4l2_ctrl_lock(master);
1570 /* g_volatile_ctrl will update the current control values */
1571 if (ctrl->is_volatile && master->ops->g_volatile_ctrl)
1572 ret = master->ops->g_volatile_ctrl(master);
1573 /* If OK, then copy the current control values to the caller */
1574 if (!ret)
1575 ret = cluster_walk(i, cs, helpers, cur_to_user);
1576 v4l2_ctrl_unlock(master);
1577 cluster_done(i, cs, helpers);
1578 }
1579
1580 if (cs->count > ARRAY_SIZE(helper))
1581 kfree(helpers);
1582 return ret;
1583 }
1584 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
1585
1586 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1587 {
1588 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
1589 }
1590 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
1591
1592 /* Helper function to get a single control */
1593 static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
1594 {
1595 struct v4l2_ctrl *master = ctrl->cluster[0];
1596 int ret = 0;
1597
1598 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1599 return -EACCES;
1600
1601 v4l2_ctrl_lock(master);
1602 /* g_volatile_ctrl will update the current control values */
1603 if (ctrl->is_volatile && master->ops->g_volatile_ctrl)
1604 ret = master->ops->g_volatile_ctrl(master);
1605 *val = ctrl->cur.val;
1606 v4l2_ctrl_unlock(master);
1607 return ret;
1608 }
1609
1610 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
1611 {
1612 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
1613
1614 if (ctrl == NULL || !type_is_int(ctrl))
1615 return -EINVAL;
1616 return get_ctrl(ctrl, &control->value);
1617 }
1618 EXPORT_SYMBOL(v4l2_g_ctrl);
1619
1620 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
1621 {
1622 return v4l2_g_ctrl(sd->ctrl_handler, control);
1623 }
1624 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
1625
1626 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
1627 {
1628 s32 val = 0;
1629
1630 /* It's a driver bug if this happens. */
1631 WARN_ON(!type_is_int(ctrl));
1632 get_ctrl(ctrl, &val);
1633 return val;
1634 }
1635 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
1636
1637
1638 /* Core function that calls try/s_ctrl and ensures that the new value is
1639 copied to the current value on a set.
1640 Must be called with ctrl->handler->lock held. */
1641 static int try_or_set_control_cluster(struct v4l2_ctrl *master, bool set)
1642 {
1643 bool try = !set;
1644 int ret = 0;
1645 int i;
1646
1647 /* Go through the cluster and either validate the new value or
1648 (if no new value was set), copy the current value to the new
1649 value, ensuring a consistent view for the control ops when
1650 called. */
1651 for (i = 0; !ret && i < master->ncontrols; i++) {
1652 struct v4l2_ctrl *ctrl = master->cluster[i];
1653
1654 if (ctrl == NULL)
1655 continue;
1656
1657 if (ctrl->is_new) {
1658 /* Double check this: it may have changed since the
1659 last check in try_or_set_ext_ctrls(). */
1660 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
1661 return -EBUSY;
1662
1663 /* Validate if required */
1664 if (!set)
1665 ret = validate_new(ctrl);
1666 continue;
1667 }
1668 /* No new value was set, so copy the current and force
1669 a call to try_ctrl later, since the values for the cluster
1670 may now have changed and the end result might be invalid. */
1671 try = true;
1672 cur_to_new(ctrl);
1673 }
1674
1675 /* For larger clusters you have to call try_ctrl again to
1676 verify that the controls are still valid after the
1677 'cur_to_new' above. */
1678 if (!ret && master->ops->try_ctrl && try)
1679 ret = master->ops->try_ctrl(master);
1680
1681 /* Don't set if there is no change */
1682 if (!ret && set && cluster_changed(master)) {
1683 ret = master->ops->s_ctrl(master);
1684 /* If OK, then make the new values permanent. */
1685 if (!ret)
1686 for (i = 0; i < master->ncontrols; i++)
1687 new_to_cur(master->cluster[i]);
1688 }
1689 return ret;
1690 }
1691
1692 /* Try or set controls. */
1693 static int try_or_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1694 struct v4l2_ext_controls *cs,
1695 struct ctrl_helper *helpers,
1696 bool set)
1697 {
1698 unsigned i, j;
1699 int ret = 0;
1700
1701 cs->error_idx = cs->count;
1702 for (i = 0; i < cs->count; i++) {
1703 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1704
1705 if (!set)
1706 cs->error_idx = i;
1707
1708 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
1709 return -EACCES;
1710 /* This test is also done in try_set_control_cluster() which
1711 is called in atomic context, so that has the final say,
1712 but it makes sense to do an up-front check as well. Once
1713 an error occurs in try_set_control_cluster() some other
1714 controls may have been set already and we want to do a
1715 best-effort to avoid that. */
1716 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
1717 return -EBUSY;
1718 }
1719
1720 for (i = 0; !ret && i < cs->count; i++) {
1721 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1722 struct v4l2_ctrl *master = ctrl->cluster[0];
1723
1724 cs->error_idx = i;
1725
1726 if (helpers[i].handled)
1727 continue;
1728
1729 v4l2_ctrl_lock(ctrl);
1730
1731 /* Reset the 'is_new' flags of the cluster */
1732 for (j = 0; j < master->ncontrols; j++)
1733 if (master->cluster[j])
1734 master->cluster[j]->is_new = 0;
1735
1736 /* Copy the new caller-supplied control values.
1737 user_to_new() sets 'is_new' to 1. */
1738 ret = cluster_walk(i, cs, helpers, user_to_new);
1739
1740 if (!ret)
1741 ret = try_or_set_control_cluster(master, set);
1742
1743 /* Copy the new values back to userspace. */
1744 if (!ret)
1745 ret = cluster_walk(i, cs, helpers, new_to_user);
1746
1747 v4l2_ctrl_unlock(ctrl);
1748 cluster_done(i, cs, helpers);
1749 }
1750 return ret;
1751 }
1752
1753 /* Try or try-and-set controls */
1754 static int try_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1755 struct v4l2_ext_controls *cs,
1756 bool set)
1757 {
1758 struct ctrl_helper helper[4];
1759 struct ctrl_helper *helpers = helper;
1760 int ret;
1761 int i;
1762
1763 cs->error_idx = cs->count;
1764 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1765
1766 if (hdl == NULL)
1767 return -EINVAL;
1768
1769 if (cs->count == 0)
1770 return class_check(hdl, cs->ctrl_class);
1771
1772 if (cs->count > ARRAY_SIZE(helper)) {
1773 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1774 if (!helpers)
1775 return -ENOMEM;
1776 }
1777 ret = prepare_ext_ctrls(hdl, cs, helpers, !set);
1778 if (ret)
1779 goto free;
1780
1781 /* First 'try' all controls and abort on error */
1782 ret = try_or_set_ext_ctrls(hdl, cs, helpers, false);
1783 /* If this is a 'set' operation and the initial 'try' failed,
1784 then set error_idx to count to tell the application that no
1785 controls changed value yet. */
1786 if (set)
1787 cs->error_idx = cs->count;
1788 if (!ret && set) {
1789 /* Reset 'handled' state */
1790 for (i = 0; i < cs->count; i++)
1791 helpers[i].handled = false;
1792 ret = try_or_set_ext_ctrls(hdl, cs, helpers, true);
1793 }
1794
1795 free:
1796 if (cs->count > ARRAY_SIZE(helper))
1797 kfree(helpers);
1798 return ret;
1799 }
1800
1801 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1802 {
1803 return try_set_ext_ctrls(hdl, cs, false);
1804 }
1805 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
1806
1807 int v4l2_s_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1808 {
1809 return try_set_ext_ctrls(hdl, cs, true);
1810 }
1811 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
1812
1813 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1814 {
1815 return try_set_ext_ctrls(sd->ctrl_handler, cs, false);
1816 }
1817 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
1818
1819 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1820 {
1821 return try_set_ext_ctrls(sd->ctrl_handler, cs, true);
1822 }
1823 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
1824
1825 /* Helper function for VIDIOC_S_CTRL compatibility */
1826 static int set_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
1827 {
1828 struct v4l2_ctrl *master = ctrl->cluster[0];
1829 int ret;
1830 int i;
1831
1832 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
1833 return -EACCES;
1834
1835 v4l2_ctrl_lock(ctrl);
1836
1837 /* Reset the 'is_new' flags of the cluster */
1838 for (i = 0; i < master->ncontrols; i++)
1839 if (master->cluster[i])
1840 master->cluster[i]->is_new = 0;
1841
1842 ctrl->val = *val;
1843 ctrl->is_new = 1;
1844 ret = try_or_set_control_cluster(master, false);
1845 if (!ret)
1846 ret = try_or_set_control_cluster(master, true);
1847 *val = ctrl->cur.val;
1848 v4l2_ctrl_unlock(ctrl);
1849 return ret;
1850 }
1851
1852 int v4l2_s_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
1853 {
1854 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
1855
1856 if (ctrl == NULL || !type_is_int(ctrl))
1857 return -EINVAL;
1858
1859 return set_ctrl(ctrl, &control->value);
1860 }
1861 EXPORT_SYMBOL(v4l2_s_ctrl);
1862
1863 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
1864 {
1865 return v4l2_s_ctrl(sd->ctrl_handler, control);
1866 }
1867 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
1868
1869 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
1870 {
1871 /* It's a driver bug if this happens. */
1872 WARN_ON(!type_is_int(ctrl));
1873 return set_ctrl(ctrl, &val);
1874 }
1875 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
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