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Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / media / video / v4l2-ctrls.c
blobf7824a02680c8204025e6d92c34cf1c1c0b8a687
1 /*
2 V4L2 controls framework implementation.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/ctype.h>
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-event.h>
28 #include <media/v4l2-dev.h>
29
30 #define has_op(master, op) \
31 (master->ops && master->ops->op)
32 #define call_op(master, op) \
33 (has_op(master, op) ? master->ops->op(master) : 0)
34
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl *ctrl;
41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
43 u32 next;
44 };
45
46 /* Small helper function to determine if the autocluster is set to manual
47 mode. In that case the is_volatile flag should be ignored. */
48 static bool is_cur_manual(const struct v4l2_ctrl *master)
49 {
50 return master->is_auto && master->cur.val == master->manual_mode_value;
51 }
52
53 /* Same as above, but this checks the against the new value instead of the
54 current value. */
55 static bool is_new_manual(const struct v4l2_ctrl *master)
56 {
57 return master->is_auto && master->val == master->manual_mode_value;
58 }
59
60 /* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
64 const char * const *v4l2_ctrl_get_menu(u32 id)
65 {
66 static const char * const mpeg_audio_sampling_freq[] = {
67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
72 static const char * const mpeg_audio_encoding[] = {
73 "MPEG-1/2 Layer I",
74 "MPEG-1/2 Layer II",
75 "MPEG-1/2 Layer III",
76 "MPEG-2/4 AAC",
77 "AC-3",
78 NULL
79 };
80 static const char * const mpeg_audio_l1_bitrate[] = {
81 "32 kbps",
82 "64 kbps",
83 "96 kbps",
84 "128 kbps",
85 "160 kbps",
86 "192 kbps",
87 "224 kbps",
88 "256 kbps",
89 "288 kbps",
90 "320 kbps",
91 "352 kbps",
92 "384 kbps",
93 "416 kbps",
94 "448 kbps",
95 NULL
96 };
97 static const char * const mpeg_audio_l2_bitrate[] = {
98 "32 kbps",
99 "48 kbps",
100 "56 kbps",
101 "64 kbps",
102 "80 kbps",
103 "96 kbps",
104 "112 kbps",
105 "128 kbps",
106 "160 kbps",
107 "192 kbps",
108 "224 kbps",
109 "256 kbps",
110 "320 kbps",
111 "384 kbps",
112 NULL
113 };
114 static const char * const mpeg_audio_l3_bitrate[] = {
115 "32 kbps",
116 "40 kbps",
117 "48 kbps",
118 "56 kbps",
119 "64 kbps",
120 "80 kbps",
121 "96 kbps",
122 "112 kbps",
123 "128 kbps",
124 "160 kbps",
125 "192 kbps",
126 "224 kbps",
127 "256 kbps",
128 "320 kbps",
129 NULL
130 };
131 static const char * const mpeg_audio_ac3_bitrate[] = {
132 "32 kbps",
133 "40 kbps",
134 "48 kbps",
135 "56 kbps",
136 "64 kbps",
137 "80 kbps",
138 "96 kbps",
139 "112 kbps",
140 "128 kbps",
141 "160 kbps",
142 "192 kbps",
143 "224 kbps",
144 "256 kbps",
145 "320 kbps",
146 "384 kbps",
147 "448 kbps",
148 "512 kbps",
149 "576 kbps",
150 "640 kbps",
151 NULL
152 };
153 static const char * const mpeg_audio_mode[] = {
154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
160 static const char * const mpeg_audio_mode_extension[] = {
161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
167 static const char * const mpeg_audio_emphasis[] = {
168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
173 static const char * const mpeg_audio_crc[] = {
174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
178 static const char * const mpeg_video_encoding[] = {
179 "MPEG-1",
180 "MPEG-2",
181 "MPEG-4 AVC",
182 NULL
183 };
184 static const char * const mpeg_video_aspect[] = {
185 "1x1",
186 "4x3",
187 "16x9",
188 "2.21x1",
189 NULL
190 };
191 static const char * const mpeg_video_bitrate_mode[] = {
192 "Variable Bitrate",
193 "Constant Bitrate",
194 NULL
195 };
196 static const char * const mpeg_stream_type[] = {
197 "MPEG-2 Program Stream",
198 "MPEG-2 Transport Stream",
199 "MPEG-1 System Stream",
200 "MPEG-2 DVD-compatible Stream",
201 "MPEG-1 VCD-compatible Stream",
202 "MPEG-2 SVCD-compatible Stream",
203 NULL
204 };
205 static const char * const mpeg_stream_vbi_fmt[] = {
206 "No VBI",
207 "Private Packet, IVTV Format",
208 NULL
209 };
210 static const char * const camera_power_line_frequency[] = {
211 "Disabled",
212 "50 Hz",
213 "60 Hz",
214 NULL
215 };
216 static const char * const camera_exposure_auto[] = {
217 "Auto Mode",
218 "Manual Mode",
219 "Shutter Priority Mode",
220 "Aperture Priority Mode",
221 NULL
222 };
223 static const char * const colorfx[] = {
224 "None",
225 "Black & White",
226 "Sepia",
227 "Negative",
228 "Emboss",
229 "Sketch",
230 "Sky Blue",
231 "Grass Green",
232 "Skin Whiten",
233 "Vivid",
234 NULL
235 };
236 static const char * const tune_preemphasis[] = {
237 "No Preemphasis",
238 "50 useconds",
239 "75 useconds",
240 NULL,
241 };
242 static const char * const header_mode[] = {
243 "Separate Buffer",
244 "Joined With 1st Frame",
245 NULL,
246 };
247 static const char * const multi_slice[] = {
248 "Single",
249 "Max Macroblocks",
250 "Max Bytes",
251 NULL,
252 };
253 static const char * const entropy_mode[] = {
254 "CAVLC",
255 "CABAC",
256 NULL,
257 };
258 static const char * const mpeg_h264_level[] = {
259 "1",
260 "1b",
261 "1.1",
262 "1.2",
263 "1.3",
264 "2",
265 "2.1",
266 "2.2",
267 "3",
268 "3.1",
269 "3.2",
270 "4",
271 "4.1",
272 "4.2",
273 "5",
274 "5.1",
275 NULL,
276 };
277 static const char * const h264_loop_filter[] = {
278 "Enabled",
279 "Disabled",
280 "Disabled at Slice Boundary",
281 NULL,
282 };
283 static const char * const h264_profile[] = {
284 "Baseline",
285 "Constrained Baseline",
286 "Main",
287 "Extended",
288 "High",
289 "High 10",
290 "High 422",
291 "High 444 Predictive",
292 "High 10 Intra",
293 "High 422 Intra",
294 "High 444 Intra",
295 "CAVLC 444 Intra",
296 "Scalable Baseline",
297 "Scalable High",
298 "Scalable High Intra",
299 "Multiview High",
300 NULL,
301 };
302 static const char * const vui_sar_idc[] = {
303 "Unspecified",
304 "1:1",
305 "12:11",
306 "10:11",
307 "16:11",
308 "40:33",
309 "24:11",
310 "20:11",
311 "32:11",
312 "80:33",
313 "18:11",
314 "15:11",
315 "64:33",
316 "160:99",
317 "4:3",
318 "3:2",
319 "2:1",
320 "Extended SAR",
321 NULL,
322 };
323 static const char * const mpeg_mpeg4_level[] = {
324 "0",
325 "0b",
326 "1",
327 "2",
328 "3",
329 "3b",
330 "4",
331 "5",
332 NULL,
333 };
334 static const char * const mpeg4_profile[] = {
335 "Simple",
336 "Adcanved Simple",
337 "Core",
338 "Simple Scalable",
339 "Advanced Coding Efficency",
340 NULL,
341 };
342
343 static const char * const flash_led_mode[] = {
344 "Off",
345 "Flash",
346 "Torch",
347 NULL,
348 };
349 static const char * const flash_strobe_source[] = {
350 "Software",
351 "External",
352 NULL,
353 };
354
355 switch (id) {
356 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
357 return mpeg_audio_sampling_freq;
358 case V4L2_CID_MPEG_AUDIO_ENCODING:
359 return mpeg_audio_encoding;
360 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
361 return mpeg_audio_l1_bitrate;
362 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
363 return mpeg_audio_l2_bitrate;
364 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
365 return mpeg_audio_l3_bitrate;
366 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
367 return mpeg_audio_ac3_bitrate;
368 case V4L2_CID_MPEG_AUDIO_MODE:
369 return mpeg_audio_mode;
370 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
371 return mpeg_audio_mode_extension;
372 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
373 return mpeg_audio_emphasis;
374 case V4L2_CID_MPEG_AUDIO_CRC:
375 return mpeg_audio_crc;
376 case V4L2_CID_MPEG_VIDEO_ENCODING:
377 return mpeg_video_encoding;
378 case V4L2_CID_MPEG_VIDEO_ASPECT:
379 return mpeg_video_aspect;
380 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
381 return mpeg_video_bitrate_mode;
382 case V4L2_CID_MPEG_STREAM_TYPE:
383 return mpeg_stream_type;
384 case V4L2_CID_MPEG_STREAM_VBI_FMT:
385 return mpeg_stream_vbi_fmt;
386 case V4L2_CID_POWER_LINE_FREQUENCY:
387 return camera_power_line_frequency;
388 case V4L2_CID_EXPOSURE_AUTO:
389 return camera_exposure_auto;
390 case V4L2_CID_COLORFX:
391 return colorfx;
392 case V4L2_CID_TUNE_PREEMPHASIS:
393 return tune_preemphasis;
394 case V4L2_CID_FLASH_LED_MODE:
395 return flash_led_mode;
396 case V4L2_CID_FLASH_STROBE_SOURCE:
397 return flash_strobe_source;
398 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
399 return header_mode;
400 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
401 return multi_slice;
402 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
403 return entropy_mode;
404 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
405 return mpeg_h264_level;
406 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
407 return h264_loop_filter;
408 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
409 return h264_profile;
410 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
411 return vui_sar_idc;
412 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
413 return mpeg_mpeg4_level;
414 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
415 return mpeg4_profile;
416 default:
417 return NULL;
418 }
419 }
420 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
421
422 /* Return the control name. */
423 const char *v4l2_ctrl_get_name(u32 id)
424 {
425 switch (id) {
426 /* USER controls */
427 /* Keep the order of the 'case's the same as in videodev2.h! */
428 case V4L2_CID_USER_CLASS: return "User Controls";
429 case V4L2_CID_BRIGHTNESS: return "Brightness";
430 case V4L2_CID_CONTRAST: return "Contrast";
431 case V4L2_CID_SATURATION: return "Saturation";
432 case V4L2_CID_HUE: return "Hue";
433 case V4L2_CID_AUDIO_VOLUME: return "Volume";
434 case V4L2_CID_AUDIO_BALANCE: return "Balance";
435 case V4L2_CID_AUDIO_BASS: return "Bass";
436 case V4L2_CID_AUDIO_TREBLE: return "Treble";
437 case V4L2_CID_AUDIO_MUTE: return "Mute";
438 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
439 case V4L2_CID_BLACK_LEVEL: return "Black Level";
440 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
441 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
442 case V4L2_CID_RED_BALANCE: return "Red Balance";
443 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
444 case V4L2_CID_GAMMA: return "Gamma";
445 case V4L2_CID_EXPOSURE: return "Exposure";
446 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
447 case V4L2_CID_GAIN: return "Gain";
448 case V4L2_CID_HFLIP: return "Horizontal Flip";
449 case V4L2_CID_VFLIP: return "Vertical Flip";
450 case V4L2_CID_HCENTER: return "Horizontal Center";
451 case V4L2_CID_VCENTER: return "Vertical Center";
452 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
453 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
454 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
455 case V4L2_CID_SHARPNESS: return "Sharpness";
456 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
457 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
458 case V4L2_CID_COLOR_KILLER: return "Color Killer";
459 case V4L2_CID_COLORFX: return "Color Effects";
460 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
461 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
462 case V4L2_CID_ROTATE: return "Rotate";
463 case V4L2_CID_BG_COLOR: return "Background Color";
464 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
465 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
466 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
467 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Minimum Number of Capture Buffers";
468 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Minimum Number of Output Buffers";
469
470 /* MPEG controls */
471 /* Keep the order of the 'case's the same as in videodev2.h! */
472 case V4L2_CID_MPEG_CLASS: return "MPEG Encoder Controls";
473 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
474 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
475 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
476 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
477 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
478 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
479 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
480 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
481 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
482 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
483 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
484 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
485 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
486 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
487 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
488 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
489 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
490 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
491 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
492 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
493 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
494 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
495 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
496 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
497 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
498 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
499 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
500 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
501 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
502 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
503 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
504 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
505 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
506 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
507 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "The Number of Intra Refresh MBs";
508 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
509 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
510 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
511 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "The Max Number of Reference Picture";
512 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
513 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P frame QP Value";
514 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B frame QP Value";
515 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
516 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
517 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
518 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P frame QP Value";
519 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B frame QP Value";
520 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
521 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
522 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
523 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
524 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entorpy Mode";
525 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I Period";
526 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
527 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
528 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
529 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
530 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
531 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
532 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
533 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
534 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
535 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
536 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P frame QP Value";
537 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B frame QP Value";
538 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
539 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
540 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
541 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
542 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
543 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "The Maximum Bytes Per Slice";
544 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "The Number of MB in a Slice";
545 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "The Slice Partitioning Method";
546 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
547
548 /* CAMERA controls */
549 /* Keep the order of the 'case's the same as in videodev2.h! */
550 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
551 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
552 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
553 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
554 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
555 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
556 case V4L2_CID_PAN_RESET: return "Pan, Reset";
557 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
558 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
559 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
560 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
561 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
562 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic";
563 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
564 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
565 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
566 case V4L2_CID_PRIVACY: return "Privacy";
567 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
568 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
569
570 /* FM Radio Modulator control */
571 /* Keep the order of the 'case's the same as in videodev2.h! */
572 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
573 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
574 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
575 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
576 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
577 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
578 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
579 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
580 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
581 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Feature Enabled";
582 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
583 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
584 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
585 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
586 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
587 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
588 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
589 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-emphasis settings";
590 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
591 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
592
593 /* Flash controls */
594 case V4L2_CID_FLASH_CLASS: return "Flash controls";
595 case V4L2_CID_FLASH_LED_MODE: return "LED mode";
596 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe source";
597 case V4L2_CID_FLASH_STROBE: return "Strobe";
598 case V4L2_CID_FLASH_STROBE_STOP: return "Stop strobe";
599 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe status";
600 case V4L2_CID_FLASH_TIMEOUT: return "Strobe timeout";
601 case V4L2_CID_FLASH_INTENSITY: return "Intensity, flash mode";
602 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, torch mode";
603 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, indicator";
604 case V4L2_CID_FLASH_FAULT: return "Faults";
605 case V4L2_CID_FLASH_CHARGE: return "Charge";
606 case V4L2_CID_FLASH_READY: return "Ready to strobe";
607
608 default:
609 return NULL;
610 }
611 }
612 EXPORT_SYMBOL(v4l2_ctrl_get_name);
613
614 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
615 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
616 {
617 *name = v4l2_ctrl_get_name(id);
618 *flags = 0;
619
620 switch (id) {
621 case V4L2_CID_AUDIO_MUTE:
622 case V4L2_CID_AUDIO_LOUDNESS:
623 case V4L2_CID_AUTO_WHITE_BALANCE:
624 case V4L2_CID_AUTOGAIN:
625 case V4L2_CID_HFLIP:
626 case V4L2_CID_VFLIP:
627 case V4L2_CID_HUE_AUTO:
628 case V4L2_CID_CHROMA_AGC:
629 case V4L2_CID_COLOR_KILLER:
630 case V4L2_CID_MPEG_AUDIO_MUTE:
631 case V4L2_CID_MPEG_VIDEO_MUTE:
632 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
633 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
634 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
635 case V4L2_CID_FOCUS_AUTO:
636 case V4L2_CID_PRIVACY:
637 case V4L2_CID_AUDIO_LIMITER_ENABLED:
638 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
639 case V4L2_CID_PILOT_TONE_ENABLED:
640 case V4L2_CID_ILLUMINATORS_1:
641 case V4L2_CID_ILLUMINATORS_2:
642 case V4L2_CID_FLASH_STROBE_STATUS:
643 case V4L2_CID_FLASH_CHARGE:
644 case V4L2_CID_FLASH_READY:
645 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
646 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
647 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
648 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
649 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
650 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
651 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
652 *type = V4L2_CTRL_TYPE_BOOLEAN;
653 *min = 0;
654 *max = *step = 1;
655 break;
656 case V4L2_CID_PAN_RESET:
657 case V4L2_CID_TILT_RESET:
658 case V4L2_CID_FLASH_STROBE:
659 case V4L2_CID_FLASH_STROBE_STOP:
660 *type = V4L2_CTRL_TYPE_BUTTON;
661 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
662 *min = *max = *step = *def = 0;
663 break;
664 case V4L2_CID_POWER_LINE_FREQUENCY:
665 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
666 case V4L2_CID_MPEG_AUDIO_ENCODING:
667 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
668 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
669 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
670 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
671 case V4L2_CID_MPEG_AUDIO_MODE:
672 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
673 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
674 case V4L2_CID_MPEG_AUDIO_CRC:
675 case V4L2_CID_MPEG_VIDEO_ENCODING:
676 case V4L2_CID_MPEG_VIDEO_ASPECT:
677 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
678 case V4L2_CID_MPEG_STREAM_TYPE:
679 case V4L2_CID_MPEG_STREAM_VBI_FMT:
680 case V4L2_CID_EXPOSURE_AUTO:
681 case V4L2_CID_COLORFX:
682 case V4L2_CID_TUNE_PREEMPHASIS:
683 case V4L2_CID_FLASH_LED_MODE:
684 case V4L2_CID_FLASH_STROBE_SOURCE:
685 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
686 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
687 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
688 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
689 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
690 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
691 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
692 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
693 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
694 *type = V4L2_CTRL_TYPE_MENU;
695 break;
696 case V4L2_CID_RDS_TX_PS_NAME:
697 case V4L2_CID_RDS_TX_RADIO_TEXT:
698 *type = V4L2_CTRL_TYPE_STRING;
699 break;
700 case V4L2_CID_USER_CLASS:
701 case V4L2_CID_CAMERA_CLASS:
702 case V4L2_CID_MPEG_CLASS:
703 case V4L2_CID_FM_TX_CLASS:
704 case V4L2_CID_FLASH_CLASS:
705 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
706 /* You can neither read not write these */
707 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
708 *min = *max = *step = *def = 0;
709 break;
710 case V4L2_CID_BG_COLOR:
711 *type = V4L2_CTRL_TYPE_INTEGER;
712 *step = 1;
713 *min = 0;
714 /* Max is calculated as RGB888 that is 2^24 */
715 *max = 0xFFFFFF;
716 break;
717 case V4L2_CID_FLASH_FAULT:
718 *type = V4L2_CTRL_TYPE_BITMASK;
719 break;
720 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
721 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
722 *type = V4L2_CTRL_TYPE_INTEGER;
723 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
724 break;
725 default:
726 *type = V4L2_CTRL_TYPE_INTEGER;
727 break;
728 }
729 switch (id) {
730 case V4L2_CID_MPEG_AUDIO_ENCODING:
731 case V4L2_CID_MPEG_AUDIO_MODE:
732 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
733 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
734 case V4L2_CID_MPEG_STREAM_TYPE:
735 *flags |= V4L2_CTRL_FLAG_UPDATE;
736 break;
737 case V4L2_CID_AUDIO_VOLUME:
738 case V4L2_CID_AUDIO_BALANCE:
739 case V4L2_CID_AUDIO_BASS:
740 case V4L2_CID_AUDIO_TREBLE:
741 case V4L2_CID_BRIGHTNESS:
742 case V4L2_CID_CONTRAST:
743 case V4L2_CID_SATURATION:
744 case V4L2_CID_HUE:
745 case V4L2_CID_RED_BALANCE:
746 case V4L2_CID_BLUE_BALANCE:
747 case V4L2_CID_GAMMA:
748 case V4L2_CID_SHARPNESS:
749 case V4L2_CID_CHROMA_GAIN:
750 case V4L2_CID_RDS_TX_DEVIATION:
751 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
752 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
753 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
754 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
755 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
756 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
757 case V4L2_CID_PILOT_TONE_DEVIATION:
758 case V4L2_CID_PILOT_TONE_FREQUENCY:
759 case V4L2_CID_TUNE_POWER_LEVEL:
760 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
761 *flags |= V4L2_CTRL_FLAG_SLIDER;
762 break;
763 case V4L2_CID_PAN_RELATIVE:
764 case V4L2_CID_TILT_RELATIVE:
765 case V4L2_CID_FOCUS_RELATIVE:
766 case V4L2_CID_IRIS_RELATIVE:
767 case V4L2_CID_ZOOM_RELATIVE:
768 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
769 break;
770 case V4L2_CID_FLASH_STROBE_STATUS:
771 case V4L2_CID_FLASH_READY:
772 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
773 break;
774 }
775 }
776 EXPORT_SYMBOL(v4l2_ctrl_fill);
777
778 /* Helper function to determine whether the control type is compatible with
779 VIDIOC_G/S_CTRL. */
780 static bool type_is_int(const struct v4l2_ctrl *ctrl)
781 {
782 switch (ctrl->type) {
783 case V4L2_CTRL_TYPE_INTEGER64:
784 case V4L2_CTRL_TYPE_STRING:
785 /* Nope, these need v4l2_ext_control */
786 return false;
787 default:
788 return true;
789 }
790 }
791
792 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
793 {
794 memset(ev->reserved, 0, sizeof(ev->reserved));
795 ev->type = V4L2_EVENT_CTRL;
796 ev->id = ctrl->id;
797 ev->u.ctrl.changes = changes;
798 ev->u.ctrl.type = ctrl->type;
799 ev->u.ctrl.flags = ctrl->flags;
800 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
801 ev->u.ctrl.value64 = 0;
802 else
803 ev->u.ctrl.value64 = ctrl->cur.val64;
804 ev->u.ctrl.minimum = ctrl->minimum;
805 ev->u.ctrl.maximum = ctrl->maximum;
806 if (ctrl->type == V4L2_CTRL_TYPE_MENU)
807 ev->u.ctrl.step = 1;
808 else
809 ev->u.ctrl.step = ctrl->step;
810 ev->u.ctrl.default_value = ctrl->default_value;
811 }
812
813 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
814 {
815 struct v4l2_event ev;
816 struct v4l2_subscribed_event *sev;
817
818 if (list_empty(&ctrl->ev_subs))
819 return;
820 fill_event(&ev, ctrl, changes);
821
822 list_for_each_entry(sev, &ctrl->ev_subs, node)
823 if (sev->fh && (sev->fh != fh ||
824 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK)))
825 v4l2_event_queue_fh(sev->fh, &ev);
826 }
827
828 /* Helper function: copy the current control value back to the caller */
829 static int cur_to_user(struct v4l2_ext_control *c,
830 struct v4l2_ctrl *ctrl)
831 {
832 u32 len;
833
834 switch (ctrl->type) {
835 case V4L2_CTRL_TYPE_STRING:
836 len = strlen(ctrl->cur.string);
837 if (c->size < len + 1) {
838 c->size = len + 1;
839 return -ENOSPC;
840 }
841 return copy_to_user(c->string, ctrl->cur.string,
842 len + 1) ? -EFAULT : 0;
843 case V4L2_CTRL_TYPE_INTEGER64:
844 c->value64 = ctrl->cur.val64;
845 break;
846 default:
847 c->value = ctrl->cur.val;
848 break;
849 }
850 return 0;
851 }
852
853 /* Helper function: copy the caller-provider value as the new control value */
854 static int user_to_new(struct v4l2_ext_control *c,
855 struct v4l2_ctrl *ctrl)
856 {
857 int ret;
858 u32 size;
859
860 ctrl->is_new = 1;
861 switch (ctrl->type) {
862 case V4L2_CTRL_TYPE_INTEGER64:
863 ctrl->val64 = c->value64;
864 break;
865 case V4L2_CTRL_TYPE_STRING:
866 size = c->size;
867 if (size == 0)
868 return -ERANGE;
869 if (size > ctrl->maximum + 1)
870 size = ctrl->maximum + 1;
871 ret = copy_from_user(ctrl->string, c->string, size);
872 if (!ret) {
873 char last = ctrl->string[size - 1];
874
875 ctrl->string[size - 1] = 0;
876 /* If the string was longer than ctrl->maximum,
877 then return an error. */
878 if (strlen(ctrl->string) == ctrl->maximum && last)
879 return -ERANGE;
880 }
881 return ret ? -EFAULT : 0;
882 default:
883 ctrl->val = c->value;
884 break;
885 }
886 return 0;
887 }
888
889 /* Helper function: copy the new control value back to the caller */
890 static int new_to_user(struct v4l2_ext_control *c,
891 struct v4l2_ctrl *ctrl)
892 {
893 u32 len;
894
895 switch (ctrl->type) {
896 case V4L2_CTRL_TYPE_STRING:
897 len = strlen(ctrl->string);
898 if (c->size < len + 1) {
899 c->size = ctrl->maximum + 1;
900 return -ENOSPC;
901 }
902 return copy_to_user(c->string, ctrl->string,
903 len + 1) ? -EFAULT : 0;
904 case V4L2_CTRL_TYPE_INTEGER64:
905 c->value64 = ctrl->val64;
906 break;
907 default:
908 c->value = ctrl->val;
909 break;
910 }
911 return 0;
912 }
913
914 /* Copy the new value to the current value. */
915 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
916 bool update_inactive)
917 {
918 bool changed = false;
919
920 if (ctrl == NULL)
921 return;
922 switch (ctrl->type) {
923 case V4L2_CTRL_TYPE_BUTTON:
924 changed = true;
925 break;
926 case V4L2_CTRL_TYPE_STRING:
927 /* strings are always 0-terminated */
928 changed = strcmp(ctrl->string, ctrl->cur.string);
929 strcpy(ctrl->cur.string, ctrl->string);
930 break;
931 case V4L2_CTRL_TYPE_INTEGER64:
932 changed = ctrl->val64 != ctrl->cur.val64;
933 ctrl->cur.val64 = ctrl->val64;
934 break;
935 default:
936 changed = ctrl->val != ctrl->cur.val;
937 ctrl->cur.val = ctrl->val;
938 break;
939 }
940 if (update_inactive) {
941 ctrl->flags &= ~V4L2_CTRL_FLAG_INACTIVE;
942 if (!is_cur_manual(ctrl->cluster[0]))
943 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
944 }
945 if (changed || update_inactive) {
946 /* If a control was changed that was not one of the controls
947 modified by the application, then send the event to all. */
948 if (!ctrl->is_new)
949 fh = NULL;
950 send_event(fh, ctrl,
951 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
952 (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
953 }
954 }
955
956 /* Copy the current value to the new value */
957 static void cur_to_new(struct v4l2_ctrl *ctrl)
958 {
959 if (ctrl == NULL)
960 return;
961 switch (ctrl->type) {
962 case V4L2_CTRL_TYPE_STRING:
963 /* strings are always 0-terminated */
964 strcpy(ctrl->string, ctrl->cur.string);
965 break;
966 case V4L2_CTRL_TYPE_INTEGER64:
967 ctrl->val64 = ctrl->cur.val64;
968 break;
969 default:
970 ctrl->val = ctrl->cur.val;
971 break;
972 }
973 }
974
975 /* Return non-zero if one or more of the controls in the cluster has a new
976 value that differs from the current value. */
977 static int cluster_changed(struct v4l2_ctrl *master)
978 {
979 int diff = 0;
980 int i;
981
982 for (i = 0; !diff && i < master->ncontrols; i++) {
983 struct v4l2_ctrl *ctrl = master->cluster[i];
984
985 if (ctrl == NULL)
986 continue;
987 switch (ctrl->type) {
988 case V4L2_CTRL_TYPE_BUTTON:
989 /* Button controls are always 'different' */
990 return 1;
991 case V4L2_CTRL_TYPE_STRING:
992 /* strings are always 0-terminated */
993 diff = strcmp(ctrl->string, ctrl->cur.string);
994 break;
995 case V4L2_CTRL_TYPE_INTEGER64:
996 diff = ctrl->val64 != ctrl->cur.val64;
997 break;
998 default:
999 diff = ctrl->val != ctrl->cur.val;
1000 break;
1001 }
1002 }
1003 return diff;
1004 }
1005
1006 /* Validate integer-type control */
1007 static int validate_new_int(const struct v4l2_ctrl *ctrl, s32 *pval)
1008 {
1009 s32 val = *pval;
1010 u32 offset;
1011
1012 switch (ctrl->type) {
1013 case V4L2_CTRL_TYPE_INTEGER:
1014 /* Round towards the closest legal value */
1015 val += ctrl->step / 2;
1016 if (val < ctrl->minimum)
1017 val = ctrl->minimum;
1018 if (val > ctrl->maximum)
1019 val = ctrl->maximum;
1020 offset = val - ctrl->minimum;
1021 offset = ctrl->step * (offset / ctrl->step);
1022 val = ctrl->minimum + offset;
1023 *pval = val;
1024 return 0;
1025
1026 case V4L2_CTRL_TYPE_BOOLEAN:
1027 *pval = !!val;
1028 return 0;
1029
1030 case V4L2_CTRL_TYPE_MENU:
1031 if (val < ctrl->minimum || val > ctrl->maximum)
1032 return -ERANGE;
1033 if (ctrl->qmenu[val][0] == '\0' ||
1034 (ctrl->menu_skip_mask & (1 << val)))
1035 return -EINVAL;
1036 return 0;
1037
1038 case V4L2_CTRL_TYPE_BITMASK:
1039 *pval &= ctrl->maximum;
1040 return 0;
1041
1042 case V4L2_CTRL_TYPE_BUTTON:
1043 case V4L2_CTRL_TYPE_CTRL_CLASS:
1044 *pval = 0;
1045 return 0;
1046
1047 default:
1048 return -EINVAL;
1049 }
1050 }
1051
1052 /* Validate a new control */
1053 static int validate_new(const struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
1054 {
1055 char *s = c->string;
1056 size_t len;
1057
1058 switch (ctrl->type) {
1059 case V4L2_CTRL_TYPE_INTEGER:
1060 case V4L2_CTRL_TYPE_BOOLEAN:
1061 case V4L2_CTRL_TYPE_MENU:
1062 case V4L2_CTRL_TYPE_BITMASK:
1063 case V4L2_CTRL_TYPE_BUTTON:
1064 case V4L2_CTRL_TYPE_CTRL_CLASS:
1065 return validate_new_int(ctrl, &c->value);
1066
1067 case V4L2_CTRL_TYPE_INTEGER64:
1068 return 0;
1069
1070 case V4L2_CTRL_TYPE_STRING:
1071 len = strlen(s);
1072 if (len < ctrl->minimum)
1073 return -ERANGE;
1074 if ((len - ctrl->minimum) % ctrl->step)
1075 return -ERANGE;
1076 return 0;
1077
1078 default:
1079 return -EINVAL;
1080 }
1081 }
1082
1083 static inline u32 node2id(struct list_head *node)
1084 {
1085 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1086 }
1087
1088 /* Set the handler's error code if it wasn't set earlier already */
1089 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1090 {
1091 if (hdl->error == 0)
1092 hdl->error = err;
1093 return err;
1094 }
1095
1096 /* Initialize the handler */
1097 int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
1098 unsigned nr_of_controls_hint)
1099 {
1100 mutex_init(&hdl->lock);
1101 INIT_LIST_HEAD(&hdl->ctrls);
1102 INIT_LIST_HEAD(&hdl->ctrl_refs);
1103 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1104 hdl->buckets = kzalloc(sizeof(hdl->buckets[0]) * hdl->nr_of_buckets,
1105 GFP_KERNEL);
1106 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1107 return hdl->error;
1108 }
1109 EXPORT_SYMBOL(v4l2_ctrl_handler_init);
1110
1111 /* Free all controls and control refs */
1112 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1113 {
1114 struct v4l2_ctrl_ref *ref, *next_ref;
1115 struct v4l2_ctrl *ctrl, *next_ctrl;
1116 struct v4l2_subscribed_event *sev, *next_sev;
1117
1118 if (hdl == NULL || hdl->buckets == NULL)
1119 return;
1120
1121 mutex_lock(&hdl->lock);
1122 /* Free all nodes */
1123 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1124 list_del(&ref->node);
1125 kfree(ref);
1126 }
1127 /* Free all controls owned by the handler */
1128 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1129 list_del(&ctrl->node);
1130 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1131 list_del(&sev->node);
1132 kfree(ctrl);
1133 }
1134 kfree(hdl->buckets);
1135 hdl->buckets = NULL;
1136 hdl->cached = NULL;
1137 hdl->error = 0;
1138 mutex_unlock(&hdl->lock);
1139 }
1140 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1141
1142 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1143 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1144 with applications that do not use the NEXT_CTRL flag.
1145
1146 We just find the n-th private user control. It's O(N), but that should not
1147 be an issue in this particular case. */
1148 static struct v4l2_ctrl_ref *find_private_ref(
1149 struct v4l2_ctrl_handler *hdl, u32 id)
1150 {
1151 struct v4l2_ctrl_ref *ref;
1152
1153 id -= V4L2_CID_PRIVATE_BASE;
1154 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1155 /* Search for private user controls that are compatible with
1156 VIDIOC_G/S_CTRL. */
1157 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1158 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1159 if (!type_is_int(ref->ctrl))
1160 continue;
1161 if (id == 0)
1162 return ref;
1163 id--;
1164 }
1165 }
1166 return NULL;
1167 }
1168
1169 /* Find a control with the given ID. */
1170 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1171 {
1172 struct v4l2_ctrl_ref *ref;
1173 int bucket;
1174
1175 id &= V4L2_CTRL_ID_MASK;
1176
1177 /* Old-style private controls need special handling */
1178 if (id >= V4L2_CID_PRIVATE_BASE)
1179 return find_private_ref(hdl, id);
1180 bucket = id % hdl->nr_of_buckets;
1181
1182 /* Simple optimization: cache the last control found */
1183 if (hdl->cached && hdl->cached->ctrl->id == id)
1184 return hdl->cached;
1185
1186 /* Not in cache, search the hash */
1187 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1188 while (ref && ref->ctrl->id != id)
1189 ref = ref->next;
1190
1191 if (ref)
1192 hdl->cached = ref; /* cache it! */
1193 return ref;
1194 }
1195
1196 /* Find a control with the given ID. Take the handler's lock first. */
1197 static struct v4l2_ctrl_ref *find_ref_lock(
1198 struct v4l2_ctrl_handler *hdl, u32 id)
1199 {
1200 struct v4l2_ctrl_ref *ref = NULL;
1201
1202 if (hdl) {
1203 mutex_lock(&hdl->lock);
1204 ref = find_ref(hdl, id);
1205 mutex_unlock(&hdl->lock);
1206 }
1207 return ref;
1208 }
1209
1210 /* Find a control with the given ID. */
1211 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1212 {
1213 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1214
1215 return ref ? ref->ctrl : NULL;
1216 }
1217 EXPORT_SYMBOL(v4l2_ctrl_find);
1218
1219 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1220 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1221 struct v4l2_ctrl *ctrl)
1222 {
1223 struct v4l2_ctrl_ref *ref;
1224 struct v4l2_ctrl_ref *new_ref;
1225 u32 id = ctrl->id;
1226 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1227 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1228
1229 /* Automatically add the control class if it is not yet present. */
1230 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1231 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1232 return hdl->error;
1233
1234 if (hdl->error)
1235 return hdl->error;
1236
1237 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1238 if (!new_ref)
1239 return handler_set_err(hdl, -ENOMEM);
1240 new_ref->ctrl = ctrl;
1241 if (ctrl->handler == hdl) {
1242 /* By default each control starts in a cluster of its own.
1243 new_ref->ctrl is basically a cluster array with one
1244 element, so that's perfect to use as the cluster pointer.
1245 But only do this for the handler that owns the control. */
1246 ctrl->cluster = &new_ref->ctrl;
1247 ctrl->ncontrols = 1;
1248 }
1249
1250 INIT_LIST_HEAD(&new_ref->node);
1251
1252 mutex_lock(&hdl->lock);
1253
1254 /* Add immediately at the end of the list if the list is empty, or if
1255 the last element in the list has a lower ID.
1256 This ensures that when elements are added in ascending order the
1257 insertion is an O(1) operation. */
1258 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1259 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1260 goto insert_in_hash;
1261 }
1262
1263 /* Find insert position in sorted list */
1264 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1265 if (ref->ctrl->id < id)
1266 continue;
1267 /* Don't add duplicates */
1268 if (ref->ctrl->id == id) {
1269 kfree(new_ref);
1270 goto unlock;
1271 }
1272 list_add(&new_ref->node, ref->node.prev);
1273 break;
1274 }
1275
1276 insert_in_hash:
1277 /* Insert the control node in the hash */
1278 new_ref->next = hdl->buckets[bucket];
1279 hdl->buckets[bucket] = new_ref;
1280
1281 unlock:
1282 mutex_unlock(&hdl->lock);
1283 return 0;
1284 }
1285
1286 /* Add a new control */
1287 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1288 const struct v4l2_ctrl_ops *ops,
1289 u32 id, const char *name, enum v4l2_ctrl_type type,
1290 s32 min, s32 max, u32 step, s32 def,
1291 u32 flags, const char * const *qmenu, void *priv)
1292 {
1293 struct v4l2_ctrl *ctrl;
1294 unsigned sz_extra = 0;
1295
1296 if (hdl->error)
1297 return NULL;
1298
1299 /* Sanity checks */
1300 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1301 (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
1302 (type == V4L2_CTRL_TYPE_BITMASK && max == 0) ||
1303 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1304 (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
1305 handler_set_err(hdl, -ERANGE);
1306 return NULL;
1307 }
1308 if (type != V4L2_CTRL_TYPE_BITMASK && max < min) {
1309 handler_set_err(hdl, -ERANGE);
1310 return NULL;
1311 }
1312 if ((type == V4L2_CTRL_TYPE_INTEGER ||
1313 type == V4L2_CTRL_TYPE_MENU ||
1314 type == V4L2_CTRL_TYPE_BOOLEAN) &&
1315 (def < min || def > max)) {
1316 handler_set_err(hdl, -ERANGE);
1317 return NULL;
1318 }
1319 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1320 handler_set_err(hdl, -ERANGE);
1321 return NULL;
1322 }
1323
1324 if (type == V4L2_CTRL_TYPE_BUTTON)
1325 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1326 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1327 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1328 else if (type == V4L2_CTRL_TYPE_STRING)
1329 sz_extra += 2 * (max + 1);
1330
1331 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1332 if (ctrl == NULL) {
1333 handler_set_err(hdl, -ENOMEM);
1334 return NULL;
1335 }
1336
1337 INIT_LIST_HEAD(&ctrl->node);
1338 INIT_LIST_HEAD(&ctrl->ev_subs);
1339 ctrl->handler = hdl;
1340 ctrl->ops = ops;
1341 ctrl->id = id;
1342 ctrl->name = name;
1343 ctrl->type = type;
1344 ctrl->flags = flags;
1345 ctrl->minimum = min;
1346 ctrl->maximum = max;
1347 ctrl->step = step;
1348 ctrl->qmenu = qmenu;
1349 ctrl->priv = priv;
1350 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1351
1352 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1353 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1354 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1355 if (ctrl->minimum)
1356 memset(ctrl->cur.string, ' ', ctrl->minimum);
1357 }
1358 if (handler_new_ref(hdl, ctrl)) {
1359 kfree(ctrl);
1360 return NULL;
1361 }
1362 mutex_lock(&hdl->lock);
1363 list_add_tail(&ctrl->node, &hdl->ctrls);
1364 mutex_unlock(&hdl->lock);
1365 return ctrl;
1366 }
1367
1368 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1369 const struct v4l2_ctrl_config *cfg, void *priv)
1370 {
1371 bool is_menu;
1372 struct v4l2_ctrl *ctrl;
1373 const char *name = cfg->name;
1374 const char * const *qmenu = cfg->qmenu;
1375 enum v4l2_ctrl_type type = cfg->type;
1376 u32 flags = cfg->flags;
1377 s32 min = cfg->min;
1378 s32 max = cfg->max;
1379 u32 step = cfg->step;
1380 s32 def = cfg->def;
1381
1382 if (name == NULL)
1383 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1384 &def, &flags);
1385
1386 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU);
1387 if (is_menu)
1388 WARN_ON(step);
1389 else
1390 WARN_ON(cfg->menu_skip_mask);
1391 if (is_menu && qmenu == NULL)
1392 qmenu = v4l2_ctrl_get_menu(cfg->id);
1393
1394 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1395 type, min, max,
1396 is_menu ? cfg->menu_skip_mask : step,
1397 def, flags, qmenu, priv);
1398 if (ctrl) {
1399 ctrl->is_private = cfg->is_private;
1400 ctrl->is_volatile = cfg->is_volatile;
1401 }
1402 return ctrl;
1403 }
1404 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1405
1406 /* Helper function for standard non-menu controls */
1407 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1408 const struct v4l2_ctrl_ops *ops,
1409 u32 id, s32 min, s32 max, u32 step, s32 def)
1410 {
1411 const char *name;
1412 enum v4l2_ctrl_type type;
1413 u32 flags;
1414
1415 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1416 if (type == V4L2_CTRL_TYPE_MENU) {
1417 handler_set_err(hdl, -EINVAL);
1418 return NULL;
1419 }
1420 return v4l2_ctrl_new(hdl, ops, id, name, type,
1421 min, max, step, def, flags, NULL, NULL);
1422 }
1423 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1424
1425 /* Helper function for standard menu controls */
1426 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1427 const struct v4l2_ctrl_ops *ops,
1428 u32 id, s32 max, s32 mask, s32 def)
1429 {
1430 const char * const *qmenu = v4l2_ctrl_get_menu(id);
1431 const char *name;
1432 enum v4l2_ctrl_type type;
1433 s32 min;
1434 s32 step;
1435 u32 flags;
1436
1437 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1438 if (type != V4L2_CTRL_TYPE_MENU) {
1439 handler_set_err(hdl, -EINVAL);
1440 return NULL;
1441 }
1442 return v4l2_ctrl_new(hdl, ops, id, name, type,
1443 0, max, mask, def, flags, qmenu, NULL);
1444 }
1445 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1446
1447 /* Add a control from another handler to this handler */
1448 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1449 struct v4l2_ctrl *ctrl)
1450 {
1451 if (hdl == NULL || hdl->error)
1452 return NULL;
1453 if (ctrl == NULL) {
1454 handler_set_err(hdl, -EINVAL);
1455 return NULL;
1456 }
1457 if (ctrl->handler == hdl)
1458 return ctrl;
1459 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1460 }
1461 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1462
1463 /* Add the controls from another handler to our own. */
1464 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1465 struct v4l2_ctrl_handler *add)
1466 {
1467 struct v4l2_ctrl *ctrl;
1468 int ret = 0;
1469
1470 /* Do nothing if either handler is NULL or if they are the same */
1471 if (!hdl || !add || hdl == add)
1472 return 0;
1473 if (hdl->error)
1474 return hdl->error;
1475 mutex_lock(&add->lock);
1476 list_for_each_entry(ctrl, &add->ctrls, node) {
1477 /* Skip handler-private controls. */
1478 if (ctrl->is_private)
1479 continue;
1480 /* And control classes */
1481 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1482 continue;
1483 ret = handler_new_ref(hdl, ctrl);
1484 if (ret)
1485 break;
1486 }
1487 mutex_unlock(&add->lock);
1488 return ret;
1489 }
1490 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1491
1492 /* Cluster controls */
1493 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1494 {
1495 int i;
1496
1497 /* The first control is the master control and it must not be NULL */
1498 BUG_ON(ncontrols == 0 || controls[0] == NULL);
1499
1500 for (i = 0; i < ncontrols; i++) {
1501 if (controls[i]) {
1502 controls[i]->cluster = controls;
1503 controls[i]->ncontrols = ncontrols;
1504 }
1505 }
1506 }
1507 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1508
1509 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1510 u8 manual_val, bool set_volatile)
1511 {
1512 struct v4l2_ctrl *master = controls[0];
1513 u32 flag;
1514 int i;
1515
1516 v4l2_ctrl_cluster(ncontrols, controls);
1517 WARN_ON(ncontrols <= 1);
1518 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1519 master->is_auto = true;
1520 master->manual_mode_value = manual_val;
1521 master->flags |= V4L2_CTRL_FLAG_UPDATE;
1522 flag = is_cur_manual(master) ? 0 : V4L2_CTRL_FLAG_INACTIVE;
1523
1524 for (i = 1; i < ncontrols; i++)
1525 if (controls[i]) {
1526 controls[i]->is_volatile = set_volatile;
1527 controls[i]->flags |= flag;
1528 }
1529 }
1530 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1531
1532 /* Activate/deactivate a control. */
1533 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1534 {
1535 /* invert since the actual flag is called 'inactive' */
1536 bool inactive = !active;
1537 bool old;
1538
1539 if (ctrl == NULL)
1540 return;
1541
1542 if (inactive)
1543 /* set V4L2_CTRL_FLAG_INACTIVE */
1544 old = test_and_set_bit(4, &ctrl->flags);
1545 else
1546 /* clear V4L2_CTRL_FLAG_INACTIVE */
1547 old = test_and_clear_bit(4, &ctrl->flags);
1548 if (old != inactive)
1549 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1550 }
1551 EXPORT_SYMBOL(v4l2_ctrl_activate);
1552
1553 /* Grab/ungrab a control.
1554 Typically used when streaming starts and you want to grab controls,
1555 preventing the user from changing them.
1556
1557 Just call this and the framework will block any attempts to change
1558 these controls. */
1559 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1560 {
1561 bool old;
1562
1563 if (ctrl == NULL)
1564 return;
1565
1566 v4l2_ctrl_lock(ctrl);
1567 if (grabbed)
1568 /* set V4L2_CTRL_FLAG_GRABBED */
1569 old = test_and_set_bit(1, &ctrl->flags);
1570 else
1571 /* clear V4L2_CTRL_FLAG_GRABBED */
1572 old = test_and_clear_bit(1, &ctrl->flags);
1573 if (old != grabbed)
1574 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1575 v4l2_ctrl_unlock(ctrl);
1576 }
1577 EXPORT_SYMBOL(v4l2_ctrl_grab);
1578
1579 /* Log the control name and value */
1580 static void log_ctrl(const struct v4l2_ctrl *ctrl,
1581 const char *prefix, const char *colon)
1582 {
1583 int fl_inact = ctrl->flags & V4L2_CTRL_FLAG_INACTIVE;
1584 int fl_grabbed = ctrl->flags & V4L2_CTRL_FLAG_GRABBED;
1585
1586 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1587 return;
1588 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1589 return;
1590
1591 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1592
1593 switch (ctrl->type) {
1594 case V4L2_CTRL_TYPE_INTEGER:
1595 printk(KERN_CONT "%d", ctrl->cur.val);
1596 break;
1597 case V4L2_CTRL_TYPE_BOOLEAN:
1598 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1599 break;
1600 case V4L2_CTRL_TYPE_MENU:
1601 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1602 break;
1603 case V4L2_CTRL_TYPE_BITMASK:
1604 printk(KERN_CONT "0x%08x", ctrl->cur.val);
1605 break;
1606 case V4L2_CTRL_TYPE_INTEGER64:
1607 printk(KERN_CONT "%lld", ctrl->cur.val64);
1608 break;
1609 case V4L2_CTRL_TYPE_STRING:
1610 printk(KERN_CONT "%s", ctrl->cur.string);
1611 break;
1612 default:
1613 printk(KERN_CONT "unknown type %d", ctrl->type);
1614 break;
1615 }
1616 if (fl_inact && fl_grabbed)
1617 printk(KERN_CONT " (inactive, grabbed)\n");
1618 else if (fl_inact)
1619 printk(KERN_CONT " (inactive)\n");
1620 else if (fl_grabbed)
1621 printk(KERN_CONT " (grabbed)\n");
1622 else
1623 printk(KERN_CONT "\n");
1624 }
1625
1626 /* Log all controls owned by the handler */
1627 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1628 const char *prefix)
1629 {
1630 struct v4l2_ctrl *ctrl;
1631 const char *colon = "";
1632 int len;
1633
1634 if (hdl == NULL)
1635 return;
1636 if (prefix == NULL)
1637 prefix = "";
1638 len = strlen(prefix);
1639 if (len && prefix[len - 1] != ' ')
1640 colon = ": ";
1641 mutex_lock(&hdl->lock);
1642 list_for_each_entry(ctrl, &hdl->ctrls, node)
1643 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1644 log_ctrl(ctrl, prefix, colon);
1645 mutex_unlock(&hdl->lock);
1646 }
1647 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1648
1649 /* Call s_ctrl for all controls owned by the handler */
1650 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1651 {
1652 struct v4l2_ctrl *ctrl;
1653 int ret = 0;
1654
1655 if (hdl == NULL)
1656 return 0;
1657 mutex_lock(&hdl->lock);
1658 list_for_each_entry(ctrl, &hdl->ctrls, node)
1659 ctrl->done = false;
1660
1661 list_for_each_entry(ctrl, &hdl->ctrls, node) {
1662 struct v4l2_ctrl *master = ctrl->cluster[0];
1663 int i;
1664
1665 /* Skip if this control was already handled by a cluster. */
1666 /* Skip button controls and read-only controls. */
1667 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1668 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
1669 continue;
1670
1671 for (i = 0; i < master->ncontrols; i++) {
1672 if (master->cluster[i]) {
1673 cur_to_new(master->cluster[i]);
1674 master->cluster[i]->is_new = 1;
1675 master->cluster[i]->done = true;
1676 }
1677 }
1678 ret = call_op(master, s_ctrl);
1679 if (ret)
1680 break;
1681 }
1682 mutex_unlock(&hdl->lock);
1683 return ret;
1684 }
1685 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1686
1687 /* Implement VIDIOC_QUERYCTRL */
1688 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1689 {
1690 u32 id = qc->id & V4L2_CTRL_ID_MASK;
1691 struct v4l2_ctrl_ref *ref;
1692 struct v4l2_ctrl *ctrl;
1693
1694 if (hdl == NULL)
1695 return -EINVAL;
1696
1697 mutex_lock(&hdl->lock);
1698
1699 /* Try to find it */
1700 ref = find_ref(hdl, id);
1701
1702 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1703 /* Find the next control with ID > qc->id */
1704
1705 /* Did we reach the end of the control list? */
1706 if (id >= node2id(hdl->ctrl_refs.prev)) {
1707 ref = NULL; /* Yes, so there is no next control */
1708 } else if (ref) {
1709 /* We found a control with the given ID, so just get
1710 the next one in the list. */
1711 ref = list_entry(ref->node.next, typeof(*ref), node);
1712 } else {
1713 /* No control with the given ID exists, so start
1714 searching for the next largest ID. We know there
1715 is one, otherwise the first 'if' above would have
1716 been true. */
1717 list_for_each_entry(ref, &hdl->ctrl_refs, node)
1718 if (id < ref->ctrl->id)
1719 break;
1720 }
1721 }
1722 mutex_unlock(&hdl->lock);
1723 if (!ref)
1724 return -EINVAL;
1725
1726 ctrl = ref->ctrl;
1727 memset(qc, 0, sizeof(*qc));
1728 if (id >= V4L2_CID_PRIVATE_BASE)
1729 qc->id = id;
1730 else
1731 qc->id = ctrl->id;
1732 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1733 qc->minimum = ctrl->minimum;
1734 qc->maximum = ctrl->maximum;
1735 qc->default_value = ctrl->default_value;
1736 if (ctrl->type == V4L2_CTRL_TYPE_MENU)
1737 qc->step = 1;
1738 else
1739 qc->step = ctrl->step;
1740 qc->flags = ctrl->flags;
1741 qc->type = ctrl->type;
1742 return 0;
1743 }
1744 EXPORT_SYMBOL(v4l2_queryctrl);
1745
1746 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1747 {
1748 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
1749 return -EINVAL;
1750 return v4l2_queryctrl(sd->ctrl_handler, qc);
1751 }
1752 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1753
1754 /* Implement VIDIOC_QUERYMENU */
1755 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1756 {
1757 struct v4l2_ctrl *ctrl;
1758 u32 i = qm->index;
1759
1760 ctrl = v4l2_ctrl_find(hdl, qm->id);
1761 if (!ctrl)
1762 return -EINVAL;
1763
1764 qm->reserved = 0;
1765 /* Sanity checks */
1766 if (ctrl->qmenu == NULL ||
1767 i < ctrl->minimum || i > ctrl->maximum)
1768 return -EINVAL;
1769 /* Use mask to see if this menu item should be skipped */
1770 if (ctrl->menu_skip_mask & (1 << i))
1771 return -EINVAL;
1772 /* Empty menu items should also be skipped */
1773 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
1774 return -EINVAL;
1775 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
1776 return 0;
1777 }
1778 EXPORT_SYMBOL(v4l2_querymenu);
1779
1780 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
1781 {
1782 return v4l2_querymenu(sd->ctrl_handler, qm);
1783 }
1784 EXPORT_SYMBOL(v4l2_subdev_querymenu);
1785
1786
1787
1788 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
1789
1790 It is not a fully atomic operation, just best-effort only. After all, if
1791 multiple controls have to be set through multiple i2c writes (for example)
1792 then some initial writes may succeed while others fail. Thus leaving the
1793 system in an inconsistent state. The question is how much effort you are
1794 willing to spend on trying to make something atomic that really isn't.
1795
1796 From the point of view of an application the main requirement is that
1797 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
1798 error should be returned without actually affecting any controls.
1799
1800 If all the values are correct, then it is acceptable to just give up
1801 in case of low-level errors.
1802
1803 It is important though that the application can tell when only a partial
1804 configuration was done. The way we do that is through the error_idx field
1805 of struct v4l2_ext_controls: if that is equal to the count field then no
1806 controls were affected. Otherwise all controls before that index were
1807 successful in performing their 'get' or 'set' operation, the control at
1808 the given index failed, and you don't know what happened with the controls
1809 after the failed one. Since if they were part of a control cluster they
1810 could have been successfully processed (if a cluster member was encountered
1811 at index < error_idx), they could have failed (if a cluster member was at
1812 error_idx), or they may not have been processed yet (if the first cluster
1813 member appeared after error_idx).
1814
1815 It is all fairly theoretical, though. In practice all you can do is to
1816 bail out. If error_idx == count, then it is an application bug. If
1817 error_idx < count then it is only an application bug if the error code was
1818 EBUSY. That usually means that something started streaming just when you
1819 tried to set the controls. In all other cases it is a driver/hardware
1820 problem and all you can do is to retry or bail out.
1821
1822 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
1823 never modifies controls the error_idx is just set to whatever control
1824 has an invalid value.
1825 */
1826
1827 /* Prepare for the extended g/s/try functions.
1828 Find the controls in the control array and do some basic checks. */
1829 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1830 struct v4l2_ext_controls *cs,
1831 struct v4l2_ctrl_helper *helpers)
1832 {
1833 struct v4l2_ctrl_helper *h;
1834 bool have_clusters = false;
1835 u32 i;
1836
1837 for (i = 0, h = helpers; i < cs->count; i++, h++) {
1838 struct v4l2_ext_control *c = &cs->controls[i];
1839 struct v4l2_ctrl_ref *ref;
1840 struct v4l2_ctrl *ctrl;
1841 u32 id = c->id & V4L2_CTRL_ID_MASK;
1842
1843 cs->error_idx = i;
1844
1845 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
1846 return -EINVAL;
1847
1848 /* Old-style private controls are not allowed for
1849 extended controls */
1850 if (id >= V4L2_CID_PRIVATE_BASE)
1851 return -EINVAL;
1852 ref = find_ref_lock(hdl, id);
1853 if (ref == NULL)
1854 return -EINVAL;
1855 ctrl = ref->ctrl;
1856 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
1857 return -EINVAL;
1858
1859 if (ctrl->cluster[0]->ncontrols > 1)
1860 have_clusters = true;
1861 if (ctrl->cluster[0] != ctrl)
1862 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
1863 /* Store the ref to the master control of the cluster */
1864 h->mref = ref;
1865 h->ctrl = ctrl;
1866 /* Initially set next to 0, meaning that there is no other
1867 control in this helper array belonging to the same
1868 cluster */
1869 h->next = 0;
1870 }
1871
1872 /* We are done if there were no controls that belong to a multi-
1873 control cluster. */
1874 if (!have_clusters)
1875 return 0;
1876
1877 /* The code below figures out in O(n) time which controls in the list
1878 belong to the same cluster. */
1879
1880 /* This has to be done with the handler lock taken. */
1881 mutex_lock(&hdl->lock);
1882
1883 /* First zero the helper field in the master control references */
1884 for (i = 0; i < cs->count; i++)
1885 helpers[i].mref->helper = 0;
1886 for (i = 0, h = helpers; i < cs->count; i++, h++) {
1887 struct v4l2_ctrl_ref *mref = h->mref;
1888
1889 /* If the mref->helper is set, then it points to an earlier
1890 helper that belongs to the same cluster. */
1891 if (mref->helper) {
1892 /* Set the next field of mref->helper to the current
1893 index: this means that that earlier helper now
1894 points to the next helper in the same cluster. */
1895 mref->helper->next = i;
1896 /* mref should be set only for the first helper in the
1897 cluster, clear the others. */
1898 h->mref = NULL;
1899 }
1900 /* Point the mref helper to the current helper struct. */
1901 mref->helper = h;
1902 }
1903 mutex_unlock(&hdl->lock);
1904 return 0;
1905 }
1906
1907 /* Handles the corner case where cs->count == 0. It checks whether the
1908 specified control class exists. If that class ID is 0, then it checks
1909 whether there are any controls at all. */
1910 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
1911 {
1912 if (ctrl_class == 0)
1913 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
1914 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
1915 }
1916
1917
1918
1919 /* Get extended controls. Allocates the helpers array if needed. */
1920 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1921 {
1922 struct v4l2_ctrl_helper helper[4];
1923 struct v4l2_ctrl_helper *helpers = helper;
1924 int ret;
1925 int i, j;
1926
1927 cs->error_idx = cs->count;
1928 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1929
1930 if (hdl == NULL)
1931 return -EINVAL;
1932
1933 if (cs->count == 0)
1934 return class_check(hdl, cs->ctrl_class);
1935
1936 if (cs->count > ARRAY_SIZE(helper)) {
1937 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1938 if (helpers == NULL)
1939 return -ENOMEM;
1940 }
1941
1942 ret = prepare_ext_ctrls(hdl, cs, helpers);
1943 cs->error_idx = cs->count;
1944
1945 for (i = 0; !ret && i < cs->count; i++)
1946 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1947 ret = -EACCES;
1948
1949 for (i = 0; !ret && i < cs->count; i++) {
1950 int (*ctrl_to_user)(struct v4l2_ext_control *c,
1951 struct v4l2_ctrl *ctrl) = cur_to_user;
1952 struct v4l2_ctrl *master;
1953
1954 if (helpers[i].mref == NULL)
1955 continue;
1956
1957 master = helpers[i].mref->ctrl;
1958 cs->error_idx = i;
1959
1960 v4l2_ctrl_lock(master);
1961
1962 /* g_volatile_ctrl will update the new control values */
1963 if (has_op(master, g_volatile_ctrl) && !is_cur_manual(master)) {
1964 for (j = 0; j < master->ncontrols; j++)
1965 cur_to_new(master->cluster[j]);
1966 ret = call_op(master, g_volatile_ctrl);
1967 ctrl_to_user = new_to_user;
1968 }
1969 /* If OK, then copy the current (for non-volatile controls)
1970 or the new (for volatile controls) control values to the
1971 caller */
1972 if (!ret) {
1973 u32 idx = i;
1974
1975 do {
1976 ret = ctrl_to_user(cs->controls + idx,
1977 helpers[idx].ctrl);
1978 idx = helpers[idx].next;
1979 } while (!ret && idx);
1980 }
1981 v4l2_ctrl_unlock(master);
1982 }
1983
1984 if (cs->count > ARRAY_SIZE(helper))
1985 kfree(helpers);
1986 return ret;
1987 }
1988 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
1989
1990 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1991 {
1992 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
1993 }
1994 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
1995
1996 /* Helper function to get a single control */
1997 static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
1998 {
1999 struct v4l2_ctrl *master = ctrl->cluster[0];
2000 int ret = 0;
2001 int i;
2002
2003 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2004 return -EACCES;
2005
2006 v4l2_ctrl_lock(master);
2007 /* g_volatile_ctrl will update the current control values */
2008 if (ctrl->is_volatile && !is_cur_manual(master)) {
2009 for (i = 0; i < master->ncontrols; i++)
2010 cur_to_new(master->cluster[i]);
2011 ret = call_op(master, g_volatile_ctrl);
2012 *val = ctrl->val;
2013 } else {
2014 *val = ctrl->cur.val;
2015 }
2016 v4l2_ctrl_unlock(master);
2017 return ret;
2018 }
2019
2020 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2021 {
2022 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2023
2024 if (ctrl == NULL || !type_is_int(ctrl))
2025 return -EINVAL;
2026 return get_ctrl(ctrl, &control->value);
2027 }
2028 EXPORT_SYMBOL(v4l2_g_ctrl);
2029
2030 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2031 {
2032 return v4l2_g_ctrl(sd->ctrl_handler, control);
2033 }
2034 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2035
2036 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2037 {
2038 s32 val = 0;
2039
2040 /* It's a driver bug if this happens. */
2041 WARN_ON(!type_is_int(ctrl));
2042 get_ctrl(ctrl, &val);
2043 return val;
2044 }
2045 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2046
2047
2048 /* Core function that calls try/s_ctrl and ensures that the new value is
2049 copied to the current value on a set.
2050 Must be called with ctrl->handler->lock held. */
2051 static int try_or_set_cluster(struct v4l2_fh *fh,
2052 struct v4l2_ctrl *master, bool set)
2053 {
2054 bool update_flag;
2055 int ret;
2056 int i;
2057
2058 /* Go through the cluster and either validate the new value or
2059 (if no new value was set), copy the current value to the new
2060 value, ensuring a consistent view for the control ops when
2061 called. */
2062 for (i = 0; i < master->ncontrols; i++) {
2063 struct v4l2_ctrl *ctrl = master->cluster[i];
2064
2065 if (ctrl == NULL)
2066 continue;
2067
2068 if (!ctrl->is_new) {
2069 cur_to_new(ctrl);
2070 continue;
2071 }
2072 /* Check again: it may have changed since the
2073 previous check in try_or_set_ext_ctrls(). */
2074 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2075 return -EBUSY;
2076 }
2077
2078 ret = call_op(master, try_ctrl);
2079
2080 /* Don't set if there is no change */
2081 if (ret || !set || !cluster_changed(master))
2082 return ret;
2083 ret = call_op(master, s_ctrl);
2084 if (ret)
2085 return ret;
2086
2087 /* If OK, then make the new values permanent. */
2088 update_flag = is_cur_manual(master) != is_new_manual(master);
2089 for (i = 0; i < master->ncontrols; i++)
2090 new_to_cur(fh, master->cluster[i], update_flag && i > 0);
2091 return 0;
2092 }
2093
2094 /* Validate controls. */
2095 static int validate_ctrls(struct v4l2_ext_controls *cs,
2096 struct v4l2_ctrl_helper *helpers, bool set)
2097 {
2098 unsigned i;
2099 int ret = 0;
2100
2101 cs->error_idx = cs->count;
2102 for (i = 0; i < cs->count; i++) {
2103 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2104
2105 cs->error_idx = i;
2106
2107 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2108 return -EACCES;
2109 /* This test is also done in try_set_control_cluster() which
2110 is called in atomic context, so that has the final say,
2111 but it makes sense to do an up-front check as well. Once
2112 an error occurs in try_set_control_cluster() some other
2113 controls may have been set already and we want to do a
2114 best-effort to avoid that. */
2115 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2116 return -EBUSY;
2117 ret = validate_new(ctrl, &cs->controls[i]);
2118 if (ret)
2119 return ret;
2120 }
2121 return 0;
2122 }
2123
2124 /* Try or try-and-set controls */
2125 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2126 struct v4l2_ext_controls *cs,
2127 bool set)
2128 {
2129 struct v4l2_ctrl_helper helper[4];
2130 struct v4l2_ctrl_helper *helpers = helper;
2131 unsigned i, j;
2132 int ret;
2133
2134 cs->error_idx = cs->count;
2135 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2136
2137 if (hdl == NULL)
2138 return -EINVAL;
2139
2140 if (cs->count == 0)
2141 return class_check(hdl, cs->ctrl_class);
2142
2143 if (cs->count > ARRAY_SIZE(helper)) {
2144 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
2145 if (!helpers)
2146 return -ENOMEM;
2147 }
2148 ret = prepare_ext_ctrls(hdl, cs, helpers);
2149 if (!ret)
2150 ret = validate_ctrls(cs, helpers, set);
2151 if (ret && set)
2152 cs->error_idx = cs->count;
2153 for (i = 0; !ret && i < cs->count; i++) {
2154 struct v4l2_ctrl *master;
2155 u32 idx = i;
2156
2157 if (helpers[i].mref == NULL)
2158 continue;
2159
2160 cs->error_idx = i;
2161 master = helpers[i].mref->ctrl;
2162 v4l2_ctrl_lock(master);
2163
2164 /* Reset the 'is_new' flags of the cluster */
2165 for (j = 0; j < master->ncontrols; j++)
2166 if (master->cluster[j])
2167 master->cluster[j]->is_new = 0;
2168
2169 /* Copy the new caller-supplied control values.
2170 user_to_new() sets 'is_new' to 1. */
2171 do {
2172 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2173 idx = helpers[idx].next;
2174 } while (!ret && idx);
2175
2176 if (!ret)
2177 ret = try_or_set_cluster(fh, master, set);
2178
2179 /* Copy the new values back to userspace. */
2180 if (!ret) {
2181 idx = i;
2182 do {
2183 ret = new_to_user(cs->controls + idx,
2184 helpers[idx].ctrl);
2185 idx = helpers[idx].next;
2186 } while (!ret && idx);
2187 }
2188 v4l2_ctrl_unlock(master);
2189 }
2190
2191 if (cs->count > ARRAY_SIZE(helper))
2192 kfree(helpers);
2193 return ret;
2194 }
2195
2196 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2197 {
2198 return try_set_ext_ctrls(NULL, hdl, cs, false);
2199 }
2200 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2201
2202 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2203 struct v4l2_ext_controls *cs)
2204 {
2205 return try_set_ext_ctrls(fh, hdl, cs, true);
2206 }
2207 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2208
2209 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2210 {
2211 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2212 }
2213 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2214
2215 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2216 {
2217 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2218 }
2219 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2220
2221 /* Helper function for VIDIOC_S_CTRL compatibility */
2222 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val)
2223 {
2224 struct v4l2_ctrl *master = ctrl->cluster[0];
2225 int ret;
2226 int i;
2227
2228 ret = validate_new_int(ctrl, val);
2229 if (ret)
2230 return ret;
2231
2232 v4l2_ctrl_lock(ctrl);
2233
2234 /* Reset the 'is_new' flags of the cluster */
2235 for (i = 0; i < master->ncontrols; i++)
2236 if (master->cluster[i])
2237 master->cluster[i]->is_new = 0;
2238
2239 ctrl->val = *val;
2240 ctrl->is_new = 1;
2241 ret = try_or_set_cluster(fh, master, true);
2242 *val = ctrl->cur.val;
2243 v4l2_ctrl_unlock(ctrl);
2244 return ret;
2245 }
2246
2247 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2248 struct v4l2_control *control)
2249 {
2250 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2251
2252 if (ctrl == NULL || !type_is_int(ctrl))
2253 return -EINVAL;
2254
2255 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2256 return -EACCES;
2257
2258 return set_ctrl(fh, ctrl, &control->value);
2259 }
2260 EXPORT_SYMBOL(v4l2_s_ctrl);
2261
2262 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2263 {
2264 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2265 }
2266 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2267
2268 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2269 {
2270 /* It's a driver bug if this happens. */
2271 WARN_ON(!type_is_int(ctrl));
2272 return set_ctrl(NULL, ctrl, &val);
2273 }
2274 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2275
2276 void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl,
2277 struct v4l2_subscribed_event *sev)
2278 {
2279 v4l2_ctrl_lock(ctrl);
2280 list_add_tail(&sev->node, &ctrl->ev_subs);
2281 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2282 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2283 struct v4l2_event ev;
2284 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2285
2286 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2287 changes |= V4L2_EVENT_CTRL_CH_VALUE;
2288 fill_event(&ev, ctrl, changes);
2289 v4l2_event_queue_fh(sev->fh, &ev);
2290 }
2291 v4l2_ctrl_unlock(ctrl);
2292 }
2293 EXPORT_SYMBOL(v4l2_ctrl_add_event);
2294
2295 void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
2296 struct v4l2_subscribed_event *sev)
2297 {
2298 v4l2_ctrl_lock(ctrl);
2299 list_del(&sev->node);
2300 v4l2_ctrl_unlock(ctrl);
2301 }
2302 EXPORT_SYMBOL(v4l2_ctrl_del_event);
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