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drm/nvc0: gpuobj_new need only check validity and init the relevant engine
[linux-2.6/libata-dev.git] / drivers / media / video / v4l2-ctrls.c
blob9d2502cd03ffa6b332eb4291b7fc9ae779b8bf76
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 **v4l2_ctrl_get_menu(u32 id)
42 {
43 static const char *mpeg_audio_sampling_freq[] = {
44 "44.1 kHz",
45 "48 kHz",
46 "32 kHz",
47 NULL
48 };
49 static const char *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 *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 *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 *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 *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 *mpeg_audio_mode[] = {
131 "Stereo",
132 "Joint Stereo",
133 "Dual",
134 "Mono",
135 NULL
136 };
137 static const char *mpeg_audio_mode_extension[] = {
138 "Bound 4",
139 "Bound 8",
140 "Bound 12",
141 "Bound 16",
142 NULL
143 };
144 static const char *mpeg_audio_emphasis[] = {
145 "No Emphasis",
146 "50/15 us",
147 "CCITT J17",
148 NULL
149 };
150 static const char *mpeg_audio_crc[] = {
151 "No CRC",
152 "16-bit CRC",
153 NULL
154 };
155 static const char *mpeg_video_encoding[] = {
156 "MPEG-1",
157 "MPEG-2",
158 "MPEG-4 AVC",
159 NULL
160 };
161 static const char *mpeg_video_aspect[] = {
162 "1x1",
163 "4x3",
164 "16x9",
165 "2.21x1",
166 NULL
167 };
168 static const char *mpeg_video_bitrate_mode[] = {
169 "Variable Bitrate",
170 "Constant Bitrate",
171 NULL
172 };
173 static const char *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 *mpeg_stream_vbi_fmt[] = {
183 "No VBI",
184 "Private packet, IVTV format",
185 NULL
186 };
187 static const char *camera_power_line_frequency[] = {
188 "Disabled",
189 "50 Hz",
190 "60 Hz",
191 NULL
192 };
193 static const char *camera_exposure_auto[] = {
194 "Auto Mode",
195 "Manual Mode",
196 "Shutter Priority Mode",
197 "Aperture Priority Mode",
198 NULL
199 };
200 static const char *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 *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->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 */
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 **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 def < min || def > max || 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
973 if (type == V4L2_CTRL_TYPE_BUTTON)
974 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
975 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
976 flags |= V4L2_CTRL_FLAG_READ_ONLY;
977 else if (type == V4L2_CTRL_TYPE_STRING)
978 sz_extra += 2 * (max + 1);
979
980 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
981 if (ctrl == NULL) {
982 handler_set_err(hdl, -ENOMEM);
983 return NULL;
984 }
985
986 INIT_LIST_HEAD(&ctrl->node);
987 ctrl->handler = hdl;
988 ctrl->ops = ops;
989 ctrl->id = id;
990 ctrl->name = name;
991 ctrl->type = type;
992 ctrl->flags = flags;
993 ctrl->minimum = min;
994 ctrl->maximum = max;
995 ctrl->step = step;
996 ctrl->qmenu = qmenu;
997 ctrl->priv = priv;
998 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
999
1000 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1001 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1002 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1003 if (ctrl->minimum)
1004 memset(ctrl->cur.string, ' ', ctrl->minimum);
1005 }
1006 if (handler_new_ref(hdl, ctrl)) {
1007 kfree(ctrl);
1008 return NULL;
1009 }
1010 mutex_lock(&hdl->lock);
1011 list_add_tail(&ctrl->node, &hdl->ctrls);
1012 mutex_unlock(&hdl->lock);
1013 return ctrl;
1014 }
1015
1016 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1017 const struct v4l2_ctrl_config *cfg, void *priv)
1018 {
1019 bool is_menu;
1020 struct v4l2_ctrl *ctrl;
1021 const char *name = cfg->name;
1022 const char **qmenu = cfg->qmenu;
1023 enum v4l2_ctrl_type type = cfg->type;
1024 u32 flags = cfg->flags;
1025 s32 min = cfg->min;
1026 s32 max = cfg->max;
1027 u32 step = cfg->step;
1028 s32 def = cfg->def;
1029
1030 if (name == NULL)
1031 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1032 &def, &flags);
1033
1034 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU);
1035 if (is_menu)
1036 WARN_ON(step);
1037 else
1038 WARN_ON(cfg->menu_skip_mask);
1039 if (is_menu && qmenu == NULL)
1040 qmenu = v4l2_ctrl_get_menu(cfg->id);
1041
1042 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1043 type, min, max,
1044 is_menu ? cfg->menu_skip_mask : step,
1045 def, flags, qmenu, priv);
1046 if (ctrl) {
1047 ctrl->is_private = cfg->is_private;
1048 ctrl->is_volatile = cfg->is_volatile;
1049 }
1050 return ctrl;
1051 }
1052 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1053
1054 /* Helper function for standard non-menu controls */
1055 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1056 const struct v4l2_ctrl_ops *ops,
1057 u32 id, s32 min, s32 max, u32 step, s32 def)
1058 {
1059 const char *name;
1060 enum v4l2_ctrl_type type;
1061 u32 flags;
1062
1063 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1064 if (type == V4L2_CTRL_TYPE_MENU) {
1065 handler_set_err(hdl, -EINVAL);
1066 return NULL;
1067 }
1068 return v4l2_ctrl_new(hdl, ops, id, name, type,
1069 min, max, step, def, flags, NULL, NULL);
1070 }
1071 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1072
1073 /* Helper function for standard menu controls */
1074 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1075 const struct v4l2_ctrl_ops *ops,
1076 u32 id, s32 max, s32 mask, s32 def)
1077 {
1078 const char **qmenu = v4l2_ctrl_get_menu(id);
1079 const char *name;
1080 enum v4l2_ctrl_type type;
1081 s32 min;
1082 s32 step;
1083 u32 flags;
1084
1085 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1086 if (type != V4L2_CTRL_TYPE_MENU) {
1087 handler_set_err(hdl, -EINVAL);
1088 return NULL;
1089 }
1090 return v4l2_ctrl_new(hdl, ops, id, name, type,
1091 0, max, mask, def, flags, qmenu, NULL);
1092 }
1093 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1094
1095 /* Add a control from another handler to this handler */
1096 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1097 struct v4l2_ctrl *ctrl)
1098 {
1099 if (hdl == NULL || hdl->error)
1100 return NULL;
1101 if (ctrl == NULL) {
1102 handler_set_err(hdl, -EINVAL);
1103 return NULL;
1104 }
1105 if (ctrl->handler == hdl)
1106 return ctrl;
1107 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1108 }
1109 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1110
1111 /* Add the controls from another handler to our own. */
1112 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1113 struct v4l2_ctrl_handler *add)
1114 {
1115 struct v4l2_ctrl *ctrl;
1116 int ret = 0;
1117
1118 /* Do nothing if either handler is NULL or if they are the same */
1119 if (!hdl || !add || hdl == add)
1120 return 0;
1121 if (hdl->error)
1122 return hdl->error;
1123 mutex_lock(&add->lock);
1124 list_for_each_entry(ctrl, &add->ctrls, node) {
1125 /* Skip handler-private controls. */
1126 if (ctrl->is_private)
1127 continue;
1128 ret = handler_new_ref(hdl, ctrl);
1129 if (ret)
1130 break;
1131 }
1132 mutex_unlock(&add->lock);
1133 return ret;
1134 }
1135 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1136
1137 /* Cluster controls */
1138 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1139 {
1140 int i;
1141
1142 /* The first control is the master control and it must not be NULL */
1143 BUG_ON(controls[0] == NULL);
1144
1145 for (i = 0; i < ncontrols; i++) {
1146 if (controls[i]) {
1147 controls[i]->cluster = controls;
1148 controls[i]->ncontrols = ncontrols;
1149 }
1150 }
1151 }
1152 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1153
1154 /* Activate/deactivate a control. */
1155 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1156 {
1157 if (ctrl == NULL)
1158 return;
1159
1160 if (!active)
1161 /* set V4L2_CTRL_FLAG_INACTIVE */
1162 set_bit(4, &ctrl->flags);
1163 else
1164 /* clear V4L2_CTRL_FLAG_INACTIVE */
1165 clear_bit(4, &ctrl->flags);
1166 }
1167 EXPORT_SYMBOL(v4l2_ctrl_activate);
1168
1169 /* Grab/ungrab a control.
1170 Typically used when streaming starts and you want to grab controls,
1171 preventing the user from changing them.
1172
1173 Just call this and the framework will block any attempts to change
1174 these controls. */
1175 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1176 {
1177 if (ctrl == NULL)
1178 return;
1179
1180 if (grabbed)
1181 /* set V4L2_CTRL_FLAG_GRABBED */
1182 set_bit(1, &ctrl->flags);
1183 else
1184 /* clear V4L2_CTRL_FLAG_GRABBED */
1185 clear_bit(1, &ctrl->flags);
1186 }
1187 EXPORT_SYMBOL(v4l2_ctrl_grab);
1188
1189 /* Log the control name and value */
1190 static void log_ctrl(const struct v4l2_ctrl *ctrl,
1191 const char *prefix, const char *colon)
1192 {
1193 int fl_inact = ctrl->flags & V4L2_CTRL_FLAG_INACTIVE;
1194 int fl_grabbed = ctrl->flags & V4L2_CTRL_FLAG_GRABBED;
1195
1196 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1197 return;
1198 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1199 return;
1200
1201 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1202
1203 switch (ctrl->type) {
1204 case V4L2_CTRL_TYPE_INTEGER:
1205 printk(KERN_CONT "%d", ctrl->cur.val);
1206 break;
1207 case V4L2_CTRL_TYPE_BOOLEAN:
1208 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1209 break;
1210 case V4L2_CTRL_TYPE_MENU:
1211 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1212 break;
1213 case V4L2_CTRL_TYPE_INTEGER64:
1214 printk(KERN_CONT "%lld", ctrl->cur.val64);
1215 break;
1216 case V4L2_CTRL_TYPE_STRING:
1217 printk(KERN_CONT "%s", ctrl->cur.string);
1218 break;
1219 default:
1220 printk(KERN_CONT "unknown type %d", ctrl->type);
1221 break;
1222 }
1223 if (fl_inact && fl_grabbed)
1224 printk(KERN_CONT " (inactive, grabbed)\n");
1225 else if (fl_inact)
1226 printk(KERN_CONT " (inactive)\n");
1227 else if (fl_grabbed)
1228 printk(KERN_CONT " (grabbed)\n");
1229 else
1230 printk(KERN_CONT "\n");
1231 }
1232
1233 /* Log all controls owned by the handler */
1234 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1235 const char *prefix)
1236 {
1237 struct v4l2_ctrl *ctrl;
1238 const char *colon = "";
1239 int len;
1240
1241 if (hdl == NULL)
1242 return;
1243 if (prefix == NULL)
1244 prefix = "";
1245 len = strlen(prefix);
1246 if (len && prefix[len - 1] != ' ')
1247 colon = ": ";
1248 mutex_lock(&hdl->lock);
1249 list_for_each_entry(ctrl, &hdl->ctrls, node)
1250 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1251 log_ctrl(ctrl, prefix, colon);
1252 mutex_unlock(&hdl->lock);
1253 }
1254 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1255
1256 /* Call s_ctrl for all controls owned by the handler */
1257 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1258 {
1259 struct v4l2_ctrl *ctrl;
1260 int ret = 0;
1261
1262 if (hdl == NULL)
1263 return 0;
1264 mutex_lock(&hdl->lock);
1265 list_for_each_entry(ctrl, &hdl->ctrls, node)
1266 ctrl->done = false;
1267
1268 list_for_each_entry(ctrl, &hdl->ctrls, node) {
1269 struct v4l2_ctrl *master = ctrl->cluster[0];
1270 int i;
1271
1272 /* Skip if this control was already handled by a cluster. */
1273 if (ctrl->done)
1274 continue;
1275
1276 for (i = 0; i < master->ncontrols; i++)
1277 cur_to_new(master->cluster[i]);
1278
1279 /* Skip button controls and read-only controls. */
1280 if (ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1281 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
1282 continue;
1283 ret = master->ops->s_ctrl(master);
1284 if (ret)
1285 break;
1286 for (i = 0; i < master->ncontrols; i++)
1287 if (master->cluster[i])
1288 master->cluster[i]->done = true;
1289 }
1290 mutex_unlock(&hdl->lock);
1291 return ret;
1292 }
1293 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1294
1295 /* Implement VIDIOC_QUERYCTRL */
1296 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1297 {
1298 u32 id = qc->id & V4L2_CTRL_ID_MASK;
1299 struct v4l2_ctrl_ref *ref;
1300 struct v4l2_ctrl *ctrl;
1301
1302 if (hdl == NULL)
1303 return -EINVAL;
1304
1305 mutex_lock(&hdl->lock);
1306
1307 /* Try to find it */
1308 ref = find_ref(hdl, id);
1309
1310 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1311 /* Find the next control with ID > qc->id */
1312
1313 /* Did we reach the end of the control list? */
1314 if (id >= node2id(hdl->ctrl_refs.prev)) {
1315 ref = NULL; /* Yes, so there is no next control */
1316 } else if (ref) {
1317 /* We found a control with the given ID, so just get
1318 the next one in the list. */
1319 ref = list_entry(ref->node.next, typeof(*ref), node);
1320 } else {
1321 /* No control with the given ID exists, so start
1322 searching for the next largest ID. We know there
1323 is one, otherwise the first 'if' above would have
1324 been true. */
1325 list_for_each_entry(ref, &hdl->ctrl_refs, node)
1326 if (id < ref->ctrl->id)
1327 break;
1328 }
1329 }
1330 mutex_unlock(&hdl->lock);
1331 if (!ref)
1332 return -EINVAL;
1333
1334 ctrl = ref->ctrl;
1335 memset(qc, 0, sizeof(*qc));
1336 qc->id = ctrl->id;
1337 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1338 qc->minimum = ctrl->minimum;
1339 qc->maximum = ctrl->maximum;
1340 qc->default_value = ctrl->default_value;
1341 if (qc->type == V4L2_CTRL_TYPE_MENU)
1342 qc->step = 1;
1343 else
1344 qc->step = ctrl->step;
1345 qc->flags = ctrl->flags;
1346 qc->type = ctrl->type;
1347 return 0;
1348 }
1349 EXPORT_SYMBOL(v4l2_queryctrl);
1350
1351 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1352 {
1353 return v4l2_queryctrl(sd->ctrl_handler, qc);
1354 }
1355 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1356
1357 /* Implement VIDIOC_QUERYMENU */
1358 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1359 {
1360 struct v4l2_ctrl *ctrl;
1361 u32 i = qm->index;
1362
1363 ctrl = v4l2_ctrl_find(hdl, qm->id);
1364 if (!ctrl)
1365 return -EINVAL;
1366
1367 qm->reserved = 0;
1368 /* Sanity checks */
1369 if (ctrl->qmenu == NULL ||
1370 i < ctrl->minimum || i > ctrl->maximum)
1371 return -EINVAL;
1372 /* Use mask to see if this menu item should be skipped */
1373 if (ctrl->menu_skip_mask & (1 << i))
1374 return -EINVAL;
1375 /* Empty menu items should also be skipped */
1376 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
1377 return -EINVAL;
1378 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
1379 return 0;
1380 }
1381 EXPORT_SYMBOL(v4l2_querymenu);
1382
1383 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
1384 {
1385 return v4l2_querymenu(sd->ctrl_handler, qm);
1386 }
1387 EXPORT_SYMBOL(v4l2_subdev_querymenu);
1388
1389
1390
1391 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
1392
1393 It is not a fully atomic operation, just best-effort only. After all, if
1394 multiple controls have to be set through multiple i2c writes (for example)
1395 then some initial writes may succeed while others fail. Thus leaving the
1396 system in an inconsistent state. The question is how much effort you are
1397 willing to spend on trying to make something atomic that really isn't.
1398
1399 From the point of view of an application the main requirement is that
1400 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
1401 error should be returned without actually affecting any controls.
1402
1403 If all the values are correct, then it is acceptable to just give up
1404 in case of low-level errors.
1405
1406 It is important though that the application can tell when only a partial
1407 configuration was done. The way we do that is through the error_idx field
1408 of struct v4l2_ext_controls: if that is equal to the count field then no
1409 controls were affected. Otherwise all controls before that index were
1410 successful in performing their 'get' or 'set' operation, the control at
1411 the given index failed, and you don't know what happened with the controls
1412 after the failed one. Since if they were part of a control cluster they
1413 could have been successfully processed (if a cluster member was encountered
1414 at index < error_idx), they could have failed (if a cluster member was at
1415 error_idx), or they may not have been processed yet (if the first cluster
1416 member appeared after error_idx).
1417
1418 It is all fairly theoretical, though. In practice all you can do is to
1419 bail out. If error_idx == count, then it is an application bug. If
1420 error_idx < count then it is only an application bug if the error code was
1421 EBUSY. That usually means that something started streaming just when you
1422 tried to set the controls. In all other cases it is a driver/hardware
1423 problem and all you can do is to retry or bail out.
1424
1425 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
1426 never modifies controls the error_idx is just set to whatever control
1427 has an invalid value.
1428 */
1429
1430 /* Prepare for the extended g/s/try functions.
1431 Find the controls in the control array and do some basic checks. */
1432 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1433 struct v4l2_ext_controls *cs,
1434 struct ctrl_helper *helpers,
1435 bool try)
1436 {
1437 u32 i;
1438
1439 for (i = 0; i < cs->count; i++) {
1440 struct v4l2_ext_control *c = &cs->controls[i];
1441 struct v4l2_ctrl *ctrl;
1442 u32 id = c->id & V4L2_CTRL_ID_MASK;
1443
1444 if (try)
1445 cs->error_idx = i;
1446
1447 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
1448 return -EINVAL;
1449
1450 /* Old-style private controls are not allowed for
1451 extended controls */
1452 if (id >= V4L2_CID_PRIVATE_BASE)
1453 return -EINVAL;
1454 ctrl = v4l2_ctrl_find(hdl, id);
1455 if (ctrl == NULL)
1456 return -EINVAL;
1457 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
1458 return -EINVAL;
1459
1460 helpers[i].ctrl = ctrl;
1461 helpers[i].handled = false;
1462 }
1463 return 0;
1464 }
1465
1466 typedef int (*cluster_func)(struct v4l2_ext_control *c,
1467 struct v4l2_ctrl *ctrl);
1468
1469 /* Walk over all controls in v4l2_ext_controls belonging to the same cluster
1470 and call the provided function. */
1471 static int cluster_walk(unsigned from,
1472 struct v4l2_ext_controls *cs,
1473 struct ctrl_helper *helpers,
1474 cluster_func f)
1475 {
1476 struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster;
1477 int ret = 0;
1478 int i;
1479
1480 /* Find any controls from the same cluster and call the function */
1481 for (i = from; !ret && i < cs->count; i++) {
1482 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1483
1484 if (!helpers[i].handled && ctrl->cluster == cluster)
1485 ret = f(&cs->controls[i], ctrl);
1486 }
1487 return ret;
1488 }
1489
1490 static void cluster_done(unsigned from,
1491 struct v4l2_ext_controls *cs,
1492 struct ctrl_helper *helpers)
1493 {
1494 struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster;
1495 int i;
1496
1497 /* Find any controls from the same cluster and mark them as handled */
1498 for (i = from; i < cs->count; i++)
1499 if (helpers[i].ctrl->cluster == cluster)
1500 helpers[i].handled = true;
1501 }
1502
1503 /* Handles the corner case where cs->count == 0. It checks whether the
1504 specified control class exists. If that class ID is 0, then it checks
1505 whether there are any controls at all. */
1506 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
1507 {
1508 if (ctrl_class == 0)
1509 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
1510 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
1511 }
1512
1513
1514
1515 /* Get extended controls. Allocates the helpers array if needed. */
1516 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1517 {
1518 struct ctrl_helper helper[4];
1519 struct ctrl_helper *helpers = helper;
1520 int ret;
1521 int i;
1522
1523 cs->error_idx = cs->count;
1524 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1525
1526 if (hdl == NULL)
1527 return -EINVAL;
1528
1529 if (cs->count == 0)
1530 return class_check(hdl, cs->ctrl_class);
1531
1532 if (cs->count > ARRAY_SIZE(helper)) {
1533 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1534 if (helpers == NULL)
1535 return -ENOMEM;
1536 }
1537
1538 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
1539
1540 for (i = 0; !ret && i < cs->count; i++)
1541 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1542 ret = -EACCES;
1543
1544 for (i = 0; !ret && i < cs->count; i++) {
1545 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1546 struct v4l2_ctrl *master = ctrl->cluster[0];
1547
1548 if (helpers[i].handled)
1549 continue;
1550
1551 cs->error_idx = i;
1552
1553 v4l2_ctrl_lock(master);
1554 /* g_volatile_ctrl will update the current control values */
1555 if (ctrl->is_volatile && master->ops->g_volatile_ctrl)
1556 ret = master->ops->g_volatile_ctrl(master);
1557 /* If OK, then copy the current control values to the caller */
1558 if (!ret)
1559 ret = cluster_walk(i, cs, helpers, cur_to_user);
1560 v4l2_ctrl_unlock(master);
1561 cluster_done(i, cs, helpers);
1562 }
1563
1564 if (cs->count > ARRAY_SIZE(helper))
1565 kfree(helpers);
1566 return ret;
1567 }
1568 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
1569
1570 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1571 {
1572 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
1573 }
1574 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
1575
1576 /* Helper function to get a single control */
1577 static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
1578 {
1579 struct v4l2_ctrl *master = ctrl->cluster[0];
1580 int ret = 0;
1581
1582 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1583 return -EACCES;
1584
1585 v4l2_ctrl_lock(master);
1586 /* g_volatile_ctrl will update the current control values */
1587 if (ctrl->is_volatile && master->ops->g_volatile_ctrl)
1588 ret = master->ops->g_volatile_ctrl(master);
1589 *val = ctrl->cur.val;
1590 v4l2_ctrl_unlock(master);
1591 return ret;
1592 }
1593
1594 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
1595 {
1596 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
1597
1598 if (ctrl == NULL || !type_is_int(ctrl))
1599 return -EINVAL;
1600 return get_ctrl(ctrl, &control->value);
1601 }
1602 EXPORT_SYMBOL(v4l2_g_ctrl);
1603
1604 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
1605 {
1606 return v4l2_g_ctrl(sd->ctrl_handler, control);
1607 }
1608 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
1609
1610 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
1611 {
1612 s32 val = 0;
1613
1614 /* It's a driver bug if this happens. */
1615 WARN_ON(!type_is_int(ctrl));
1616 get_ctrl(ctrl, &val);
1617 return val;
1618 }
1619 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
1620
1621
1622 /* Core function that calls try/s_ctrl and ensures that the new value is
1623 copied to the current value on a set.
1624 Must be called with ctrl->handler->lock held. */
1625 static int try_or_set_control_cluster(struct v4l2_ctrl *master, bool set)
1626 {
1627 bool try = !set;
1628 int ret = 0;
1629 int i;
1630
1631 /* Go through the cluster and either validate the new value or
1632 (if no new value was set), copy the current value to the new
1633 value, ensuring a consistent view for the control ops when
1634 called. */
1635 for (i = 0; !ret && i < master->ncontrols; i++) {
1636 struct v4l2_ctrl *ctrl = master->cluster[i];
1637
1638 if (ctrl == NULL)
1639 continue;
1640
1641 if (ctrl->has_new) {
1642 /* Double check this: it may have changed since the
1643 last check in try_or_set_ext_ctrls(). */
1644 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
1645 return -EBUSY;
1646
1647 /* Validate if required */
1648 if (!set)
1649 ret = validate_new(ctrl);
1650 continue;
1651 }
1652 /* No new value was set, so copy the current and force
1653 a call to try_ctrl later, since the values for the cluster
1654 may now have changed and the end result might be invalid. */
1655 try = true;
1656 cur_to_new(ctrl);
1657 }
1658
1659 /* For larger clusters you have to call try_ctrl again to
1660 verify that the controls are still valid after the
1661 'cur_to_new' above. */
1662 if (!ret && master->ops->try_ctrl && try)
1663 ret = master->ops->try_ctrl(master);
1664
1665 /* Don't set if there is no change */
1666 if (!ret && set && cluster_changed(master)) {
1667 ret = master->ops->s_ctrl(master);
1668 /* If OK, then make the new values permanent. */
1669 if (!ret)
1670 for (i = 0; i < master->ncontrols; i++)
1671 new_to_cur(master->cluster[i]);
1672 }
1673 return ret;
1674 }
1675
1676 /* Try or set controls. */
1677 static int try_or_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1678 struct v4l2_ext_controls *cs,
1679 struct ctrl_helper *helpers,
1680 bool set)
1681 {
1682 unsigned i, j;
1683 int ret = 0;
1684
1685 cs->error_idx = cs->count;
1686 for (i = 0; i < cs->count; i++) {
1687 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1688
1689 if (!set)
1690 cs->error_idx = i;
1691
1692 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
1693 return -EACCES;
1694 /* This test is also done in try_set_control_cluster() which
1695 is called in atomic context, so that has the final say,
1696 but it makes sense to do an up-front check as well. Once
1697 an error occurs in try_set_control_cluster() some other
1698 controls may have been set already and we want to do a
1699 best-effort to avoid that. */
1700 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
1701 return -EBUSY;
1702 }
1703
1704 for (i = 0; !ret && i < cs->count; i++) {
1705 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1706 struct v4l2_ctrl *master = ctrl->cluster[0];
1707
1708 cs->error_idx = i;
1709
1710 if (helpers[i].handled)
1711 continue;
1712
1713 v4l2_ctrl_lock(ctrl);
1714
1715 /* Reset the 'has_new' flags of the cluster */
1716 for (j = 0; j < master->ncontrols; j++)
1717 if (master->cluster[j])
1718 master->cluster[j]->has_new = 0;
1719
1720 /* Copy the new caller-supplied control values.
1721 user_to_new() sets 'has_new' to 1. */
1722 ret = cluster_walk(i, cs, helpers, user_to_new);
1723
1724 if (!ret)
1725 ret = try_or_set_control_cluster(master, set);
1726
1727 /* Copy the new values back to userspace. */
1728 if (!ret)
1729 ret = cluster_walk(i, cs, helpers, new_to_user);
1730
1731 v4l2_ctrl_unlock(ctrl);
1732 cluster_done(i, cs, helpers);
1733 }
1734 return ret;
1735 }
1736
1737 /* Try or try-and-set controls */
1738 static int try_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1739 struct v4l2_ext_controls *cs,
1740 bool set)
1741 {
1742 struct ctrl_helper helper[4];
1743 struct ctrl_helper *helpers = helper;
1744 int ret;
1745 int i;
1746
1747 cs->error_idx = cs->count;
1748 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1749
1750 if (hdl == NULL)
1751 return -EINVAL;
1752
1753 if (cs->count == 0)
1754 return class_check(hdl, cs->ctrl_class);
1755
1756 if (cs->count > ARRAY_SIZE(helper)) {
1757 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1758 if (!helpers)
1759 return -ENOMEM;
1760 }
1761 ret = prepare_ext_ctrls(hdl, cs, helpers, !set);
1762 if (ret)
1763 goto free;
1764
1765 /* First 'try' all controls and abort on error */
1766 ret = try_or_set_ext_ctrls(hdl, cs, helpers, false);
1767 /* If this is a 'set' operation and the initial 'try' failed,
1768 then set error_idx to count to tell the application that no
1769 controls changed value yet. */
1770 if (set)
1771 cs->error_idx = cs->count;
1772 if (!ret && set) {
1773 /* Reset 'handled' state */
1774 for (i = 0; i < cs->count; i++)
1775 helpers[i].handled = false;
1776 ret = try_or_set_ext_ctrls(hdl, cs, helpers, true);
1777 }
1778
1779 free:
1780 if (cs->count > ARRAY_SIZE(helper))
1781 kfree(helpers);
1782 return ret;
1783 }
1784
1785 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1786 {
1787 return try_set_ext_ctrls(hdl, cs, false);
1788 }
1789 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
1790
1791 int v4l2_s_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1792 {
1793 return try_set_ext_ctrls(hdl, cs, true);
1794 }
1795 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
1796
1797 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1798 {
1799 return try_set_ext_ctrls(sd->ctrl_handler, cs, false);
1800 }
1801 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
1802
1803 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1804 {
1805 return try_set_ext_ctrls(sd->ctrl_handler, cs, true);
1806 }
1807 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
1808
1809 /* Helper function for VIDIOC_S_CTRL compatibility */
1810 static int set_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
1811 {
1812 struct v4l2_ctrl *master = ctrl->cluster[0];
1813 int ret;
1814 int i;
1815
1816 v4l2_ctrl_lock(ctrl);
1817
1818 /* Reset the 'has_new' flags of the cluster */
1819 for (i = 0; i < master->ncontrols; i++)
1820 if (master->cluster[i])
1821 master->cluster[i]->has_new = 0;
1822
1823 ctrl->val = *val;
1824 ctrl->has_new = 1;
1825 ret = try_or_set_control_cluster(master, false);
1826 if (!ret)
1827 ret = try_or_set_control_cluster(master, true);
1828 *val = ctrl->cur.val;
1829 v4l2_ctrl_unlock(ctrl);
1830 return ret;
1831 }
1832
1833 int v4l2_s_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
1834 {
1835 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
1836
1837 if (ctrl == NULL || !type_is_int(ctrl))
1838 return -EINVAL;
1839
1840 return set_ctrl(ctrl, &control->value);
1841 }
1842 EXPORT_SYMBOL(v4l2_s_ctrl);
1843
1844 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
1845 {
1846 return v4l2_s_ctrl(sd->ctrl_handler, control);
1847 }
1848 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
1849
1850 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
1851 {
1852 /* It's a driver bug if this happens. */
1853 WARN_ON(!type_is_int(ctrl));
1854 return set_ctrl(ctrl, &val);
1855 }
1856 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
Linux 2.6 libata-dev (mirror)