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Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-artful-kernel.git] / drivers / media / video / v4l2-ctrls.c
1 /*
2 V4L2 controls framework implementation.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/ctype.h>
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-event.h>
28 #include <media/v4l2-dev.h>
29
30 #define has_op(master, op) \
31 (master->ops && master->ops->op)
32 #define call_op(master, op) \
33 (has_op(master, op) ? master->ops->op(master) : 0)
34
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl *ctrl;
41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
43 u32 next;
44 };
45
46 /* Small helper function to determine if the autocluster is set to manual
47 mode. */
48 static bool is_cur_manual(const struct v4l2_ctrl *master)
49 {
50 return master->is_auto && master->cur.val == master->manual_mode_value;
51 }
52
53 /* Same as above, but this checks the against the new value instead of the
54 current value. */
55 static bool is_new_manual(const struct v4l2_ctrl *master)
56 {
57 return master->is_auto && master->val == master->manual_mode_value;
58 }
59
60 /* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
64 const char * const *v4l2_ctrl_get_menu(u32 id)
65 {
66 static const char * const mpeg_audio_sampling_freq[] = {
67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
72 static const char * const mpeg_audio_encoding[] = {
73 "MPEG-1/2 Layer I",
74 "MPEG-1/2 Layer II",
75 "MPEG-1/2 Layer III",
76 "MPEG-2/4 AAC",
77 "AC-3",
78 NULL
79 };
80 static const char * const mpeg_audio_l1_bitrate[] = {
81 "32 kbps",
82 "64 kbps",
83 "96 kbps",
84 "128 kbps",
85 "160 kbps",
86 "192 kbps",
87 "224 kbps",
88 "256 kbps",
89 "288 kbps",
90 "320 kbps",
91 "352 kbps",
92 "384 kbps",
93 "416 kbps",
94 "448 kbps",
95 NULL
96 };
97 static const char * const mpeg_audio_l2_bitrate[] = {
98 "32 kbps",
99 "48 kbps",
100 "56 kbps",
101 "64 kbps",
102 "80 kbps",
103 "96 kbps",
104 "112 kbps",
105 "128 kbps",
106 "160 kbps",
107 "192 kbps",
108 "224 kbps",
109 "256 kbps",
110 "320 kbps",
111 "384 kbps",
112 NULL
113 };
114 static const char * const mpeg_audio_l3_bitrate[] = {
115 "32 kbps",
116 "40 kbps",
117 "48 kbps",
118 "56 kbps",
119 "64 kbps",
120 "80 kbps",
121 "96 kbps",
122 "112 kbps",
123 "128 kbps",
124 "160 kbps",
125 "192 kbps",
126 "224 kbps",
127 "256 kbps",
128 "320 kbps",
129 NULL
130 };
131 static const char * const mpeg_audio_ac3_bitrate[] = {
132 "32 kbps",
133 "40 kbps",
134 "48 kbps",
135 "56 kbps",
136 "64 kbps",
137 "80 kbps",
138 "96 kbps",
139 "112 kbps",
140 "128 kbps",
141 "160 kbps",
142 "192 kbps",
143 "224 kbps",
144 "256 kbps",
145 "320 kbps",
146 "384 kbps",
147 "448 kbps",
148 "512 kbps",
149 "576 kbps",
150 "640 kbps",
151 NULL
152 };
153 static const char * const mpeg_audio_mode[] = {
154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
160 static const char * const mpeg_audio_mode_extension[] = {
161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
167 static const char * const mpeg_audio_emphasis[] = {
168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
173 static const char * const mpeg_audio_crc[] = {
174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
178 static const char * const mpeg_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 "Auto",
215 NULL
216 };
217 static const char * const camera_exposure_auto[] = {
218 "Auto Mode",
219 "Manual Mode",
220 "Shutter Priority Mode",
221 "Aperture Priority Mode",
222 NULL
223 };
224 static const char * const colorfx[] = {
225 "None",
226 "Black & White",
227 "Sepia",
228 "Negative",
229 "Emboss",
230 "Sketch",
231 "Sky Blue",
232 "Grass Green",
233 "Skin Whiten",
234 "Vivid",
235 NULL
236 };
237 static const char * const tune_preemphasis[] = {
238 "No Preemphasis",
239 "50 useconds",
240 "75 useconds",
241 NULL,
242 };
243 static const char * const header_mode[] = {
244 "Separate Buffer",
245 "Joined With 1st Frame",
246 NULL,
247 };
248 static const char * const multi_slice[] = {
249 "Single",
250 "Max Macroblocks",
251 "Max Bytes",
252 NULL,
253 };
254 static const char * const entropy_mode[] = {
255 "CAVLC",
256 "CABAC",
257 NULL,
258 };
259 static const char * const mpeg_h264_level[] = {
260 "1",
261 "1b",
262 "1.1",
263 "1.2",
264 "1.3",
265 "2",
266 "2.1",
267 "2.2",
268 "3",
269 "3.1",
270 "3.2",
271 "4",
272 "4.1",
273 "4.2",
274 "5",
275 "5.1",
276 NULL,
277 };
278 static const char * const h264_loop_filter[] = {
279 "Enabled",
280 "Disabled",
281 "Disabled at Slice Boundary",
282 NULL,
283 };
284 static const char * const h264_profile[] = {
285 "Baseline",
286 "Constrained Baseline",
287 "Main",
288 "Extended",
289 "High",
290 "High 10",
291 "High 422",
292 "High 444 Predictive",
293 "High 10 Intra",
294 "High 422 Intra",
295 "High 444 Intra",
296 "CAVLC 444 Intra",
297 "Scalable Baseline",
298 "Scalable High",
299 "Scalable High Intra",
300 "Multiview High",
301 NULL,
302 };
303 static const char * const vui_sar_idc[] = {
304 "Unspecified",
305 "1:1",
306 "12:11",
307 "10:11",
308 "16:11",
309 "40:33",
310 "24:11",
311 "20:11",
312 "32:11",
313 "80:33",
314 "18:11",
315 "15:11",
316 "64:33",
317 "160:99",
318 "4:3",
319 "3:2",
320 "2:1",
321 "Extended SAR",
322 NULL,
323 };
324 static const char * const mpeg_mpeg4_level[] = {
325 "0",
326 "0b",
327 "1",
328 "2",
329 "3",
330 "3b",
331 "4",
332 "5",
333 NULL,
334 };
335 static const char * const mpeg4_profile[] = {
336 "Simple",
337 "Adcanved Simple",
338 "Core",
339 "Simple Scalable",
340 "Advanced Coding Efficency",
341 NULL,
342 };
343
344 static const char * const flash_led_mode[] = {
345 "Off",
346 "Flash",
347 "Torch",
348 NULL,
349 };
350 static const char * const flash_strobe_source[] = {
351 "Software",
352 "External",
353 NULL,
354 };
355
356 switch (id) {
357 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
358 return mpeg_audio_sampling_freq;
359 case V4L2_CID_MPEG_AUDIO_ENCODING:
360 return mpeg_audio_encoding;
361 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
362 return mpeg_audio_l1_bitrate;
363 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
364 return mpeg_audio_l2_bitrate;
365 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
366 return mpeg_audio_l3_bitrate;
367 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
368 return mpeg_audio_ac3_bitrate;
369 case V4L2_CID_MPEG_AUDIO_MODE:
370 return mpeg_audio_mode;
371 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
372 return mpeg_audio_mode_extension;
373 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
374 return mpeg_audio_emphasis;
375 case V4L2_CID_MPEG_AUDIO_CRC:
376 return mpeg_audio_crc;
377 case V4L2_CID_MPEG_VIDEO_ENCODING:
378 return mpeg_video_encoding;
379 case V4L2_CID_MPEG_VIDEO_ASPECT:
380 return mpeg_video_aspect;
381 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
382 return mpeg_video_bitrate_mode;
383 case V4L2_CID_MPEG_STREAM_TYPE:
384 return mpeg_stream_type;
385 case V4L2_CID_MPEG_STREAM_VBI_FMT:
386 return mpeg_stream_vbi_fmt;
387 case V4L2_CID_POWER_LINE_FREQUENCY:
388 return camera_power_line_frequency;
389 case V4L2_CID_EXPOSURE_AUTO:
390 return camera_exposure_auto;
391 case V4L2_CID_COLORFX:
392 return colorfx;
393 case V4L2_CID_TUNE_PREEMPHASIS:
394 return tune_preemphasis;
395 case V4L2_CID_FLASH_LED_MODE:
396 return flash_led_mode;
397 case V4L2_CID_FLASH_STROBE_SOURCE:
398 return flash_strobe_source;
399 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
400 return header_mode;
401 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
402 return multi_slice;
403 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
404 return entropy_mode;
405 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
406 return mpeg_h264_level;
407 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
408 return h264_loop_filter;
409 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
410 return h264_profile;
411 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
412 return vui_sar_idc;
413 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
414 return mpeg_mpeg4_level;
415 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
416 return mpeg4_profile;
417 default:
418 return NULL;
419 }
420 }
421 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
422
423 /* Return the control name. */
424 const char *v4l2_ctrl_get_name(u32 id)
425 {
426 switch (id) {
427 /* USER controls */
428 /* Keep the order of the 'case's the same as in videodev2.h! */
429 case V4L2_CID_USER_CLASS: return "User Controls";
430 case V4L2_CID_BRIGHTNESS: return "Brightness";
431 case V4L2_CID_CONTRAST: return "Contrast";
432 case V4L2_CID_SATURATION: return "Saturation";
433 case V4L2_CID_HUE: return "Hue";
434 case V4L2_CID_AUDIO_VOLUME: return "Volume";
435 case V4L2_CID_AUDIO_BALANCE: return "Balance";
436 case V4L2_CID_AUDIO_BASS: return "Bass";
437 case V4L2_CID_AUDIO_TREBLE: return "Treble";
438 case V4L2_CID_AUDIO_MUTE: return "Mute";
439 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
440 case V4L2_CID_BLACK_LEVEL: return "Black Level";
441 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
442 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
443 case V4L2_CID_RED_BALANCE: return "Red Balance";
444 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
445 case V4L2_CID_GAMMA: return "Gamma";
446 case V4L2_CID_EXPOSURE: return "Exposure";
447 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
448 case V4L2_CID_GAIN: return "Gain";
449 case V4L2_CID_HFLIP: return "Horizontal Flip";
450 case V4L2_CID_VFLIP: return "Vertical Flip";
451 case V4L2_CID_HCENTER: return "Horizontal Center";
452 case V4L2_CID_VCENTER: return "Vertical Center";
453 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
454 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
455 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
456 case V4L2_CID_SHARPNESS: return "Sharpness";
457 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
458 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
459 case V4L2_CID_COLOR_KILLER: return "Color Killer";
460 case V4L2_CID_COLORFX: return "Color Effects";
461 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
462 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
463 case V4L2_CID_ROTATE: return "Rotate";
464 case V4L2_CID_BG_COLOR: return "Background Color";
465 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
466 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
467 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
468 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Minimum Number of Capture Buffers";
469 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Minimum Number of Output Buffers";
470
471 /* MPEG controls */
472 /* Keep the order of the 'case's the same as in videodev2.h! */
473 case V4L2_CID_MPEG_CLASS: return "MPEG Encoder Controls";
474 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
475 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
476 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
477 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
478 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
479 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
480 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
481 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
482 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
483 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
484 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
485 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
486 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
487 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
488 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
489 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
490 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
491 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
492 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
493 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
494 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
495 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
496 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
497 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
498 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
499 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
500 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
501 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
502 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
503 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
504 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
505 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
506 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
507 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
508 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "The Number of Intra Refresh MBs";
509 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
510 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
511 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
512 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "The Max Number of Reference Picture";
513 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
514 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P frame QP Value";
515 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B frame QP Value";
516 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
517 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
518 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
519 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P frame QP Value";
520 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B frame QP Value";
521 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
522 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
523 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
524 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
525 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entorpy Mode";
526 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I Period";
527 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
528 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
529 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
530 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
531 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
532 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
533 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
534 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
535 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
536 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
537 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P frame QP Value";
538 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B frame QP Value";
539 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
540 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
541 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
542 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
543 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
544 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "The Maximum Bytes Per Slice";
545 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "The Number of MB in a Slice";
546 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "The Slice Partitioning Method";
547 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
548
549 /* CAMERA controls */
550 /* Keep the order of the 'case's the same as in videodev2.h! */
551 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
552 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
553 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
554 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
555 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
556 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
557 case V4L2_CID_PAN_RESET: return "Pan, Reset";
558 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
559 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
560 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
561 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
562 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
563 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic";
564 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
565 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
566 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
567 case V4L2_CID_PRIVACY: return "Privacy";
568 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
569 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
570
571 /* FM Radio Modulator control */
572 /* Keep the order of the 'case's the same as in videodev2.h! */
573 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
574 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
575 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
576 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
577 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
578 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
579 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
580 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
581 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
582 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Feature Enabled";
583 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
584 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
585 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
586 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
587 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
588 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
589 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
590 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-emphasis settings";
591 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
592 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
593
594 /* Flash controls */
595 case V4L2_CID_FLASH_CLASS: return "Flash controls";
596 case V4L2_CID_FLASH_LED_MODE: return "LED mode";
597 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe source";
598 case V4L2_CID_FLASH_STROBE: return "Strobe";
599 case V4L2_CID_FLASH_STROBE_STOP: return "Stop strobe";
600 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe status";
601 case V4L2_CID_FLASH_TIMEOUT: return "Strobe timeout";
602 case V4L2_CID_FLASH_INTENSITY: return "Intensity, flash mode";
603 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, torch mode";
604 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, indicator";
605 case V4L2_CID_FLASH_FAULT: return "Faults";
606 case V4L2_CID_FLASH_CHARGE: return "Charge";
607 case V4L2_CID_FLASH_READY: return "Ready to strobe";
608
609 default:
610 return NULL;
611 }
612 }
613 EXPORT_SYMBOL(v4l2_ctrl_get_name);
614
615 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
616 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
617 {
618 *name = v4l2_ctrl_get_name(id);
619 *flags = 0;
620
621 switch (id) {
622 case V4L2_CID_AUDIO_MUTE:
623 case V4L2_CID_AUDIO_LOUDNESS:
624 case V4L2_CID_AUTO_WHITE_BALANCE:
625 case V4L2_CID_AUTOGAIN:
626 case V4L2_CID_HFLIP:
627 case V4L2_CID_VFLIP:
628 case V4L2_CID_HUE_AUTO:
629 case V4L2_CID_CHROMA_AGC:
630 case V4L2_CID_COLOR_KILLER:
631 case V4L2_CID_MPEG_AUDIO_MUTE:
632 case V4L2_CID_MPEG_VIDEO_MUTE:
633 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
634 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
635 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
636 case V4L2_CID_FOCUS_AUTO:
637 case V4L2_CID_PRIVACY:
638 case V4L2_CID_AUDIO_LIMITER_ENABLED:
639 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
640 case V4L2_CID_PILOT_TONE_ENABLED:
641 case V4L2_CID_ILLUMINATORS_1:
642 case V4L2_CID_ILLUMINATORS_2:
643 case V4L2_CID_FLASH_STROBE_STATUS:
644 case V4L2_CID_FLASH_CHARGE:
645 case V4L2_CID_FLASH_READY:
646 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
647 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
648 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
649 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
650 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
651 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
652 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
653 *type = V4L2_CTRL_TYPE_BOOLEAN;
654 *min = 0;
655 *max = *step = 1;
656 break;
657 case V4L2_CID_PAN_RESET:
658 case V4L2_CID_TILT_RESET:
659 case V4L2_CID_FLASH_STROBE:
660 case V4L2_CID_FLASH_STROBE_STOP:
661 *type = V4L2_CTRL_TYPE_BUTTON;
662 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
663 *min = *max = *step = *def = 0;
664 break;
665 case V4L2_CID_POWER_LINE_FREQUENCY:
666 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
667 case V4L2_CID_MPEG_AUDIO_ENCODING:
668 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
669 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
670 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
671 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
672 case V4L2_CID_MPEG_AUDIO_MODE:
673 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
674 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
675 case V4L2_CID_MPEG_AUDIO_CRC:
676 case V4L2_CID_MPEG_VIDEO_ENCODING:
677 case V4L2_CID_MPEG_VIDEO_ASPECT:
678 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
679 case V4L2_CID_MPEG_STREAM_TYPE:
680 case V4L2_CID_MPEG_STREAM_VBI_FMT:
681 case V4L2_CID_EXPOSURE_AUTO:
682 case V4L2_CID_COLORFX:
683 case V4L2_CID_TUNE_PREEMPHASIS:
684 case V4L2_CID_FLASH_LED_MODE:
685 case V4L2_CID_FLASH_STROBE_SOURCE:
686 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
687 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
688 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
689 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
690 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
691 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
692 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
693 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
694 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
695 *type = V4L2_CTRL_TYPE_MENU;
696 break;
697 case V4L2_CID_RDS_TX_PS_NAME:
698 case V4L2_CID_RDS_TX_RADIO_TEXT:
699 *type = V4L2_CTRL_TYPE_STRING;
700 break;
701 case V4L2_CID_USER_CLASS:
702 case V4L2_CID_CAMERA_CLASS:
703 case V4L2_CID_MPEG_CLASS:
704 case V4L2_CID_FM_TX_CLASS:
705 case V4L2_CID_FLASH_CLASS:
706 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
707 /* You can neither read not write these */
708 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
709 *min = *max = *step = *def = 0;
710 break;
711 case V4L2_CID_BG_COLOR:
712 *type = V4L2_CTRL_TYPE_INTEGER;
713 *step = 1;
714 *min = 0;
715 /* Max is calculated as RGB888 that is 2^24 */
716 *max = 0xFFFFFF;
717 break;
718 case V4L2_CID_FLASH_FAULT:
719 *type = V4L2_CTRL_TYPE_BITMASK;
720 break;
721 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
722 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
723 *type = V4L2_CTRL_TYPE_INTEGER;
724 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
725 break;
726 default:
727 *type = V4L2_CTRL_TYPE_INTEGER;
728 break;
729 }
730 switch (id) {
731 case V4L2_CID_MPEG_AUDIO_ENCODING:
732 case V4L2_CID_MPEG_AUDIO_MODE:
733 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
734 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
735 case V4L2_CID_MPEG_STREAM_TYPE:
736 *flags |= V4L2_CTRL_FLAG_UPDATE;
737 break;
738 case V4L2_CID_AUDIO_VOLUME:
739 case V4L2_CID_AUDIO_BALANCE:
740 case V4L2_CID_AUDIO_BASS:
741 case V4L2_CID_AUDIO_TREBLE:
742 case V4L2_CID_BRIGHTNESS:
743 case V4L2_CID_CONTRAST:
744 case V4L2_CID_SATURATION:
745 case V4L2_CID_HUE:
746 case V4L2_CID_RED_BALANCE:
747 case V4L2_CID_BLUE_BALANCE:
748 case V4L2_CID_GAMMA:
749 case V4L2_CID_SHARPNESS:
750 case V4L2_CID_CHROMA_GAIN:
751 case V4L2_CID_RDS_TX_DEVIATION:
752 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
753 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
754 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
755 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
756 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
757 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
758 case V4L2_CID_PILOT_TONE_DEVIATION:
759 case V4L2_CID_PILOT_TONE_FREQUENCY:
760 case V4L2_CID_TUNE_POWER_LEVEL:
761 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
762 *flags |= V4L2_CTRL_FLAG_SLIDER;
763 break;
764 case V4L2_CID_PAN_RELATIVE:
765 case V4L2_CID_TILT_RELATIVE:
766 case V4L2_CID_FOCUS_RELATIVE:
767 case V4L2_CID_IRIS_RELATIVE:
768 case V4L2_CID_ZOOM_RELATIVE:
769 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
770 break;
771 case V4L2_CID_FLASH_STROBE_STATUS:
772 case V4L2_CID_FLASH_READY:
773 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
774 break;
775 }
776 }
777 EXPORT_SYMBOL(v4l2_ctrl_fill);
778
779 /* Helper function to determine whether the control type is compatible with
780 VIDIOC_G/S_CTRL. */
781 static bool type_is_int(const struct v4l2_ctrl *ctrl)
782 {
783 switch (ctrl->type) {
784 case V4L2_CTRL_TYPE_INTEGER64:
785 case V4L2_CTRL_TYPE_STRING:
786 /* Nope, these need v4l2_ext_control */
787 return false;
788 default:
789 return true;
790 }
791 }
792
793 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
794 {
795 memset(ev->reserved, 0, sizeof(ev->reserved));
796 ev->type = V4L2_EVENT_CTRL;
797 ev->id = ctrl->id;
798 ev->u.ctrl.changes = changes;
799 ev->u.ctrl.type = ctrl->type;
800 ev->u.ctrl.flags = ctrl->flags;
801 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
802 ev->u.ctrl.value64 = 0;
803 else
804 ev->u.ctrl.value64 = ctrl->cur.val64;
805 ev->u.ctrl.minimum = ctrl->minimum;
806 ev->u.ctrl.maximum = ctrl->maximum;
807 if (ctrl->type == V4L2_CTRL_TYPE_MENU)
808 ev->u.ctrl.step = 1;
809 else
810 ev->u.ctrl.step = ctrl->step;
811 ev->u.ctrl.default_value = ctrl->default_value;
812 }
813
814 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
815 {
816 struct v4l2_event ev;
817 struct v4l2_subscribed_event *sev;
818
819 if (list_empty(&ctrl->ev_subs))
820 return;
821 fill_event(&ev, ctrl, changes);
822
823 list_for_each_entry(sev, &ctrl->ev_subs, node)
824 if (sev->fh && (sev->fh != fh ||
825 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK)))
826 v4l2_event_queue_fh(sev->fh, &ev);
827 }
828
829 /* Helper function: copy the current control value back to the caller */
830 static int cur_to_user(struct v4l2_ext_control *c,
831 struct v4l2_ctrl *ctrl)
832 {
833 u32 len;
834
835 switch (ctrl->type) {
836 case V4L2_CTRL_TYPE_STRING:
837 len = strlen(ctrl->cur.string);
838 if (c->size < len + 1) {
839 c->size = len + 1;
840 return -ENOSPC;
841 }
842 return copy_to_user(c->string, ctrl->cur.string,
843 len + 1) ? -EFAULT : 0;
844 case V4L2_CTRL_TYPE_INTEGER64:
845 c->value64 = ctrl->cur.val64;
846 break;
847 default:
848 c->value = ctrl->cur.val;
849 break;
850 }
851 return 0;
852 }
853
854 /* Helper function: copy the caller-provider value as the new control value */
855 static int user_to_new(struct v4l2_ext_control *c,
856 struct v4l2_ctrl *ctrl)
857 {
858 int ret;
859 u32 size;
860
861 ctrl->is_new = 1;
862 switch (ctrl->type) {
863 case V4L2_CTRL_TYPE_INTEGER64:
864 ctrl->val64 = c->value64;
865 break;
866 case V4L2_CTRL_TYPE_STRING:
867 size = c->size;
868 if (size == 0)
869 return -ERANGE;
870 if (size > ctrl->maximum + 1)
871 size = ctrl->maximum + 1;
872 ret = copy_from_user(ctrl->string, c->string, size);
873 if (!ret) {
874 char last = ctrl->string[size - 1];
875
876 ctrl->string[size - 1] = 0;
877 /* If the string was longer than ctrl->maximum,
878 then return an error. */
879 if (strlen(ctrl->string) == ctrl->maximum && last)
880 return -ERANGE;
881 }
882 return ret ? -EFAULT : 0;
883 default:
884 ctrl->val = c->value;
885 break;
886 }
887 return 0;
888 }
889
890 /* Helper function: copy the new control value back to the caller */
891 static int new_to_user(struct v4l2_ext_control *c,
892 struct v4l2_ctrl *ctrl)
893 {
894 u32 len;
895
896 switch (ctrl->type) {
897 case V4L2_CTRL_TYPE_STRING:
898 len = strlen(ctrl->string);
899 if (c->size < len + 1) {
900 c->size = ctrl->maximum + 1;
901 return -ENOSPC;
902 }
903 return copy_to_user(c->string, ctrl->string,
904 len + 1) ? -EFAULT : 0;
905 case V4L2_CTRL_TYPE_INTEGER64:
906 c->value64 = ctrl->val64;
907 break;
908 default:
909 c->value = ctrl->val;
910 break;
911 }
912 return 0;
913 }
914
915 /* Copy the new value to the current value. */
916 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
917 bool update_inactive)
918 {
919 bool changed = false;
920
921 if (ctrl == NULL)
922 return;
923 switch (ctrl->type) {
924 case V4L2_CTRL_TYPE_BUTTON:
925 changed = true;
926 break;
927 case V4L2_CTRL_TYPE_STRING:
928 /* strings are always 0-terminated */
929 changed = strcmp(ctrl->string, ctrl->cur.string);
930 strcpy(ctrl->cur.string, ctrl->string);
931 break;
932 case V4L2_CTRL_TYPE_INTEGER64:
933 changed = ctrl->val64 != ctrl->cur.val64;
934 ctrl->cur.val64 = ctrl->val64;
935 break;
936 default:
937 changed = ctrl->val != ctrl->cur.val;
938 ctrl->cur.val = ctrl->val;
939 break;
940 }
941 if (update_inactive) {
942 /* Note: update_inactive can only be true for auto clusters. */
943 ctrl->flags &=
944 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
945 if (!is_cur_manual(ctrl->cluster[0])) {
946 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
947 if (ctrl->cluster[0]->has_volatiles)
948 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
949 }
950 }
951 if (changed || update_inactive) {
952 /* If a control was changed that was not one of the controls
953 modified by the application, then send the event to all. */
954 if (!ctrl->is_new)
955 fh = NULL;
956 send_event(fh, ctrl,
957 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
958 (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
959 }
960 }
961
962 /* Copy the current value to the new value */
963 static void cur_to_new(struct v4l2_ctrl *ctrl)
964 {
965 if (ctrl == NULL)
966 return;
967 switch (ctrl->type) {
968 case V4L2_CTRL_TYPE_STRING:
969 /* strings are always 0-terminated */
970 strcpy(ctrl->string, ctrl->cur.string);
971 break;
972 case V4L2_CTRL_TYPE_INTEGER64:
973 ctrl->val64 = ctrl->cur.val64;
974 break;
975 default:
976 ctrl->val = ctrl->cur.val;
977 break;
978 }
979 }
980
981 /* Return non-zero if one or more of the controls in the cluster has a new
982 value that differs from the current value. */
983 static int cluster_changed(struct v4l2_ctrl *master)
984 {
985 int diff = 0;
986 int i;
987
988 for (i = 0; !diff && i < master->ncontrols; i++) {
989 struct v4l2_ctrl *ctrl = master->cluster[i];
990
991 if (ctrl == NULL)
992 continue;
993 switch (ctrl->type) {
994 case V4L2_CTRL_TYPE_BUTTON:
995 /* Button controls are always 'different' */
996 return 1;
997 case V4L2_CTRL_TYPE_STRING:
998 /* strings are always 0-terminated */
999 diff = strcmp(ctrl->string, ctrl->cur.string);
1000 break;
1001 case V4L2_CTRL_TYPE_INTEGER64:
1002 diff = ctrl->val64 != ctrl->cur.val64;
1003 break;
1004 default:
1005 diff = ctrl->val != ctrl->cur.val;
1006 break;
1007 }
1008 }
1009 return diff;
1010 }
1011
1012 /* Validate integer-type control */
1013 static int validate_new_int(const struct v4l2_ctrl *ctrl, s32 *pval)
1014 {
1015 s32 val = *pval;
1016 u32 offset;
1017
1018 switch (ctrl->type) {
1019 case V4L2_CTRL_TYPE_INTEGER:
1020 /* Round towards the closest legal value */
1021 val += ctrl->step / 2;
1022 if (val < ctrl->minimum)
1023 val = ctrl->minimum;
1024 if (val > ctrl->maximum)
1025 val = ctrl->maximum;
1026 offset = val - ctrl->minimum;
1027 offset = ctrl->step * (offset / ctrl->step);
1028 val = ctrl->minimum + offset;
1029 *pval = val;
1030 return 0;
1031
1032 case V4L2_CTRL_TYPE_BOOLEAN:
1033 *pval = !!val;
1034 return 0;
1035
1036 case V4L2_CTRL_TYPE_MENU:
1037 if (val < ctrl->minimum || val > ctrl->maximum)
1038 return -ERANGE;
1039 if (ctrl->qmenu[val][0] == '\0' ||
1040 (ctrl->menu_skip_mask & (1 << val)))
1041 return -EINVAL;
1042 return 0;
1043
1044 case V4L2_CTRL_TYPE_BITMASK:
1045 *pval &= ctrl->maximum;
1046 return 0;
1047
1048 case V4L2_CTRL_TYPE_BUTTON:
1049 case V4L2_CTRL_TYPE_CTRL_CLASS:
1050 *pval = 0;
1051 return 0;
1052
1053 default:
1054 return -EINVAL;
1055 }
1056 }
1057
1058 /* Validate a new control */
1059 static int validate_new(const struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
1060 {
1061 char *s = c->string;
1062 size_t len;
1063
1064 switch (ctrl->type) {
1065 case V4L2_CTRL_TYPE_INTEGER:
1066 case V4L2_CTRL_TYPE_BOOLEAN:
1067 case V4L2_CTRL_TYPE_MENU:
1068 case V4L2_CTRL_TYPE_BITMASK:
1069 case V4L2_CTRL_TYPE_BUTTON:
1070 case V4L2_CTRL_TYPE_CTRL_CLASS:
1071 return validate_new_int(ctrl, &c->value);
1072
1073 case V4L2_CTRL_TYPE_INTEGER64:
1074 return 0;
1075
1076 case V4L2_CTRL_TYPE_STRING:
1077 len = strlen(s);
1078 if (len < ctrl->minimum)
1079 return -ERANGE;
1080 if ((len - ctrl->minimum) % ctrl->step)
1081 return -ERANGE;
1082 return 0;
1083
1084 default:
1085 return -EINVAL;
1086 }
1087 }
1088
1089 static inline u32 node2id(struct list_head *node)
1090 {
1091 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1092 }
1093
1094 /* Set the handler's error code if it wasn't set earlier already */
1095 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1096 {
1097 if (hdl->error == 0)
1098 hdl->error = err;
1099 return err;
1100 }
1101
1102 /* Initialize the handler */
1103 int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
1104 unsigned nr_of_controls_hint)
1105 {
1106 mutex_init(&hdl->lock);
1107 INIT_LIST_HEAD(&hdl->ctrls);
1108 INIT_LIST_HEAD(&hdl->ctrl_refs);
1109 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1110 hdl->buckets = kzalloc(sizeof(hdl->buckets[0]) * hdl->nr_of_buckets,
1111 GFP_KERNEL);
1112 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1113 return hdl->error;
1114 }
1115 EXPORT_SYMBOL(v4l2_ctrl_handler_init);
1116
1117 /* Free all controls and control refs */
1118 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1119 {
1120 struct v4l2_ctrl_ref *ref, *next_ref;
1121 struct v4l2_ctrl *ctrl, *next_ctrl;
1122 struct v4l2_subscribed_event *sev, *next_sev;
1123
1124 if (hdl == NULL || hdl->buckets == NULL)
1125 return;
1126
1127 mutex_lock(&hdl->lock);
1128 /* Free all nodes */
1129 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1130 list_del(&ref->node);
1131 kfree(ref);
1132 }
1133 /* Free all controls owned by the handler */
1134 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1135 list_del(&ctrl->node);
1136 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1137 list_del(&sev->node);
1138 kfree(ctrl);
1139 }
1140 kfree(hdl->buckets);
1141 hdl->buckets = NULL;
1142 hdl->cached = NULL;
1143 hdl->error = 0;
1144 mutex_unlock(&hdl->lock);
1145 }
1146 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1147
1148 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1149 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1150 with applications that do not use the NEXT_CTRL flag.
1151
1152 We just find the n-th private user control. It's O(N), but that should not
1153 be an issue in this particular case. */
1154 static struct v4l2_ctrl_ref *find_private_ref(
1155 struct v4l2_ctrl_handler *hdl, u32 id)
1156 {
1157 struct v4l2_ctrl_ref *ref;
1158
1159 id -= V4L2_CID_PRIVATE_BASE;
1160 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1161 /* Search for private user controls that are compatible with
1162 VIDIOC_G/S_CTRL. */
1163 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1164 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1165 if (!type_is_int(ref->ctrl))
1166 continue;
1167 if (id == 0)
1168 return ref;
1169 id--;
1170 }
1171 }
1172 return NULL;
1173 }
1174
1175 /* Find a control with the given ID. */
1176 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1177 {
1178 struct v4l2_ctrl_ref *ref;
1179 int bucket;
1180
1181 id &= V4L2_CTRL_ID_MASK;
1182
1183 /* Old-style private controls need special handling */
1184 if (id >= V4L2_CID_PRIVATE_BASE)
1185 return find_private_ref(hdl, id);
1186 bucket = id % hdl->nr_of_buckets;
1187
1188 /* Simple optimization: cache the last control found */
1189 if (hdl->cached && hdl->cached->ctrl->id == id)
1190 return hdl->cached;
1191
1192 /* Not in cache, search the hash */
1193 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1194 while (ref && ref->ctrl->id != id)
1195 ref = ref->next;
1196
1197 if (ref)
1198 hdl->cached = ref; /* cache it! */
1199 return ref;
1200 }
1201
1202 /* Find a control with the given ID. Take the handler's lock first. */
1203 static struct v4l2_ctrl_ref *find_ref_lock(
1204 struct v4l2_ctrl_handler *hdl, u32 id)
1205 {
1206 struct v4l2_ctrl_ref *ref = NULL;
1207
1208 if (hdl) {
1209 mutex_lock(&hdl->lock);
1210 ref = find_ref(hdl, id);
1211 mutex_unlock(&hdl->lock);
1212 }
1213 return ref;
1214 }
1215
1216 /* Find a control with the given ID. */
1217 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1218 {
1219 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1220
1221 return ref ? ref->ctrl : NULL;
1222 }
1223 EXPORT_SYMBOL(v4l2_ctrl_find);
1224
1225 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1226 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1227 struct v4l2_ctrl *ctrl)
1228 {
1229 struct v4l2_ctrl_ref *ref;
1230 struct v4l2_ctrl_ref *new_ref;
1231 u32 id = ctrl->id;
1232 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1233 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1234
1235 /* Automatically add the control class if it is not yet present. */
1236 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1237 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1238 return hdl->error;
1239
1240 if (hdl->error)
1241 return hdl->error;
1242
1243 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1244 if (!new_ref)
1245 return handler_set_err(hdl, -ENOMEM);
1246 new_ref->ctrl = ctrl;
1247 if (ctrl->handler == hdl) {
1248 /* By default each control starts in a cluster of its own.
1249 new_ref->ctrl is basically a cluster array with one
1250 element, so that's perfect to use as the cluster pointer.
1251 But only do this for the handler that owns the control. */
1252 ctrl->cluster = &new_ref->ctrl;
1253 ctrl->ncontrols = 1;
1254 }
1255
1256 INIT_LIST_HEAD(&new_ref->node);
1257
1258 mutex_lock(&hdl->lock);
1259
1260 /* Add immediately at the end of the list if the list is empty, or if
1261 the last element in the list has a lower ID.
1262 This ensures that when elements are added in ascending order the
1263 insertion is an O(1) operation. */
1264 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1265 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1266 goto insert_in_hash;
1267 }
1268
1269 /* Find insert position in sorted list */
1270 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1271 if (ref->ctrl->id < id)
1272 continue;
1273 /* Don't add duplicates */
1274 if (ref->ctrl->id == id) {
1275 kfree(new_ref);
1276 goto unlock;
1277 }
1278 list_add(&new_ref->node, ref->node.prev);
1279 break;
1280 }
1281
1282 insert_in_hash:
1283 /* Insert the control node in the hash */
1284 new_ref->next = hdl->buckets[bucket];
1285 hdl->buckets[bucket] = new_ref;
1286
1287 unlock:
1288 mutex_unlock(&hdl->lock);
1289 return 0;
1290 }
1291
1292 /* Add a new control */
1293 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1294 const struct v4l2_ctrl_ops *ops,
1295 u32 id, const char *name, enum v4l2_ctrl_type type,
1296 s32 min, s32 max, u32 step, s32 def,
1297 u32 flags, const char * const *qmenu, void *priv)
1298 {
1299 struct v4l2_ctrl *ctrl;
1300 unsigned sz_extra = 0;
1301
1302 if (hdl->error)
1303 return NULL;
1304
1305 /* Sanity checks */
1306 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1307 (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
1308 (type == V4L2_CTRL_TYPE_BITMASK && max == 0) ||
1309 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1310 (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
1311 handler_set_err(hdl, -ERANGE);
1312 return NULL;
1313 }
1314 if (type != V4L2_CTRL_TYPE_BITMASK && max < min) {
1315 handler_set_err(hdl, -ERANGE);
1316 return NULL;
1317 }
1318 if ((type == V4L2_CTRL_TYPE_INTEGER ||
1319 type == V4L2_CTRL_TYPE_MENU ||
1320 type == V4L2_CTRL_TYPE_BOOLEAN) &&
1321 (def < min || def > max)) {
1322 handler_set_err(hdl, -ERANGE);
1323 return NULL;
1324 }
1325 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1326 handler_set_err(hdl, -ERANGE);
1327 return NULL;
1328 }
1329
1330 if (type == V4L2_CTRL_TYPE_BUTTON)
1331 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1332 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1333 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1334 else if (type == V4L2_CTRL_TYPE_STRING)
1335 sz_extra += 2 * (max + 1);
1336
1337 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1338 if (ctrl == NULL) {
1339 handler_set_err(hdl, -ENOMEM);
1340 return NULL;
1341 }
1342
1343 INIT_LIST_HEAD(&ctrl->node);
1344 INIT_LIST_HEAD(&ctrl->ev_subs);
1345 ctrl->handler = hdl;
1346 ctrl->ops = ops;
1347 ctrl->id = id;
1348 ctrl->name = name;
1349 ctrl->type = type;
1350 ctrl->flags = flags;
1351 ctrl->minimum = min;
1352 ctrl->maximum = max;
1353 ctrl->step = step;
1354 ctrl->qmenu = qmenu;
1355 ctrl->priv = priv;
1356 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1357
1358 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1359 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1360 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1361 if (ctrl->minimum)
1362 memset(ctrl->cur.string, ' ', ctrl->minimum);
1363 }
1364 if (handler_new_ref(hdl, ctrl)) {
1365 kfree(ctrl);
1366 return NULL;
1367 }
1368 mutex_lock(&hdl->lock);
1369 list_add_tail(&ctrl->node, &hdl->ctrls);
1370 mutex_unlock(&hdl->lock);
1371 return ctrl;
1372 }
1373
1374 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1375 const struct v4l2_ctrl_config *cfg, void *priv)
1376 {
1377 bool is_menu;
1378 struct v4l2_ctrl *ctrl;
1379 const char *name = cfg->name;
1380 const char * const *qmenu = cfg->qmenu;
1381 enum v4l2_ctrl_type type = cfg->type;
1382 u32 flags = cfg->flags;
1383 s32 min = cfg->min;
1384 s32 max = cfg->max;
1385 u32 step = cfg->step;
1386 s32 def = cfg->def;
1387
1388 if (name == NULL)
1389 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1390 &def, &flags);
1391
1392 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU);
1393 if (is_menu)
1394 WARN_ON(step);
1395 else
1396 WARN_ON(cfg->menu_skip_mask);
1397 if (is_menu && qmenu == NULL)
1398 qmenu = v4l2_ctrl_get_menu(cfg->id);
1399
1400 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1401 type, min, max,
1402 is_menu ? cfg->menu_skip_mask : step,
1403 def, flags, qmenu, priv);
1404 if (ctrl)
1405 ctrl->is_private = cfg->is_private;
1406 return ctrl;
1407 }
1408 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1409
1410 /* Helper function for standard non-menu controls */
1411 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1412 const struct v4l2_ctrl_ops *ops,
1413 u32 id, s32 min, s32 max, u32 step, s32 def)
1414 {
1415 const char *name;
1416 enum v4l2_ctrl_type type;
1417 u32 flags;
1418
1419 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1420 if (type == V4L2_CTRL_TYPE_MENU) {
1421 handler_set_err(hdl, -EINVAL);
1422 return NULL;
1423 }
1424 return v4l2_ctrl_new(hdl, ops, id, name, type,
1425 min, max, step, def, flags, NULL, NULL);
1426 }
1427 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1428
1429 /* Helper function for standard menu controls */
1430 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1431 const struct v4l2_ctrl_ops *ops,
1432 u32 id, s32 max, s32 mask, s32 def)
1433 {
1434 const char * const *qmenu = v4l2_ctrl_get_menu(id);
1435 const char *name;
1436 enum v4l2_ctrl_type type;
1437 s32 min;
1438 s32 step;
1439 u32 flags;
1440
1441 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1442 if (type != V4L2_CTRL_TYPE_MENU) {
1443 handler_set_err(hdl, -EINVAL);
1444 return NULL;
1445 }
1446 return v4l2_ctrl_new(hdl, ops, id, name, type,
1447 0, max, mask, def, flags, qmenu, NULL);
1448 }
1449 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1450
1451 /* Add a control from another handler to this handler */
1452 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1453 struct v4l2_ctrl *ctrl)
1454 {
1455 if (hdl == NULL || hdl->error)
1456 return NULL;
1457 if (ctrl == NULL) {
1458 handler_set_err(hdl, -EINVAL);
1459 return NULL;
1460 }
1461 if (ctrl->handler == hdl)
1462 return ctrl;
1463 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1464 }
1465 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1466
1467 /* Add the controls from another handler to our own. */
1468 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1469 struct v4l2_ctrl_handler *add)
1470 {
1471 struct v4l2_ctrl *ctrl;
1472 int ret = 0;
1473
1474 /* Do nothing if either handler is NULL or if they are the same */
1475 if (!hdl || !add || hdl == add)
1476 return 0;
1477 if (hdl->error)
1478 return hdl->error;
1479 mutex_lock(&add->lock);
1480 list_for_each_entry(ctrl, &add->ctrls, node) {
1481 /* Skip handler-private controls. */
1482 if (ctrl->is_private)
1483 continue;
1484 /* And control classes */
1485 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1486 continue;
1487 ret = handler_new_ref(hdl, ctrl);
1488 if (ret)
1489 break;
1490 }
1491 mutex_unlock(&add->lock);
1492 return ret;
1493 }
1494 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1495
1496 /* Cluster controls */
1497 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1498 {
1499 bool has_volatiles = false;
1500 int i;
1501
1502 /* The first control is the master control and it must not be NULL */
1503 BUG_ON(ncontrols == 0 || controls[0] == NULL);
1504
1505 for (i = 0; i < ncontrols; i++) {
1506 if (controls[i]) {
1507 controls[i]->cluster = controls;
1508 controls[i]->ncontrols = ncontrols;
1509 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1510 has_volatiles = true;
1511 }
1512 }
1513 controls[0]->has_volatiles = has_volatiles;
1514 }
1515 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1516
1517 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1518 u8 manual_val, bool set_volatile)
1519 {
1520 struct v4l2_ctrl *master = controls[0];
1521 u32 flag = 0;
1522 int i;
1523
1524 v4l2_ctrl_cluster(ncontrols, controls);
1525 WARN_ON(ncontrols <= 1);
1526 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1527 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1528 master->is_auto = true;
1529 master->has_volatiles = set_volatile;
1530 master->manual_mode_value = manual_val;
1531 master->flags |= V4L2_CTRL_FLAG_UPDATE;
1532
1533 if (!is_cur_manual(master))
1534 flag = V4L2_CTRL_FLAG_INACTIVE |
1535 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1536
1537 for (i = 1; i < ncontrols; i++)
1538 if (controls[i])
1539 controls[i]->flags |= flag;
1540 }
1541 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1542
1543 /* Activate/deactivate a control. */
1544 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1545 {
1546 /* invert since the actual flag is called 'inactive' */
1547 bool inactive = !active;
1548 bool old;
1549
1550 if (ctrl == NULL)
1551 return;
1552
1553 if (inactive)
1554 /* set V4L2_CTRL_FLAG_INACTIVE */
1555 old = test_and_set_bit(4, &ctrl->flags);
1556 else
1557 /* clear V4L2_CTRL_FLAG_INACTIVE */
1558 old = test_and_clear_bit(4, &ctrl->flags);
1559 if (old != inactive)
1560 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1561 }
1562 EXPORT_SYMBOL(v4l2_ctrl_activate);
1563
1564 /* Grab/ungrab a control.
1565 Typically used when streaming starts and you want to grab controls,
1566 preventing the user from changing them.
1567
1568 Just call this and the framework will block any attempts to change
1569 these controls. */
1570 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1571 {
1572 bool old;
1573
1574 if (ctrl == NULL)
1575 return;
1576
1577 v4l2_ctrl_lock(ctrl);
1578 if (grabbed)
1579 /* set V4L2_CTRL_FLAG_GRABBED */
1580 old = test_and_set_bit(1, &ctrl->flags);
1581 else
1582 /* clear V4L2_CTRL_FLAG_GRABBED */
1583 old = test_and_clear_bit(1, &ctrl->flags);
1584 if (old != grabbed)
1585 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1586 v4l2_ctrl_unlock(ctrl);
1587 }
1588 EXPORT_SYMBOL(v4l2_ctrl_grab);
1589
1590 /* Log the control name and value */
1591 static void log_ctrl(const struct v4l2_ctrl *ctrl,
1592 const char *prefix, const char *colon)
1593 {
1594 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1595 return;
1596 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1597 return;
1598
1599 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1600
1601 switch (ctrl->type) {
1602 case V4L2_CTRL_TYPE_INTEGER:
1603 printk(KERN_CONT "%d", ctrl->cur.val);
1604 break;
1605 case V4L2_CTRL_TYPE_BOOLEAN:
1606 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1607 break;
1608 case V4L2_CTRL_TYPE_MENU:
1609 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1610 break;
1611 case V4L2_CTRL_TYPE_BITMASK:
1612 printk(KERN_CONT "0x%08x", ctrl->cur.val);
1613 break;
1614 case V4L2_CTRL_TYPE_INTEGER64:
1615 printk(KERN_CONT "%lld", ctrl->cur.val64);
1616 break;
1617 case V4L2_CTRL_TYPE_STRING:
1618 printk(KERN_CONT "%s", ctrl->cur.string);
1619 break;
1620 default:
1621 printk(KERN_CONT "unknown type %d", ctrl->type);
1622 break;
1623 }
1624 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
1625 V4L2_CTRL_FLAG_GRABBED |
1626 V4L2_CTRL_FLAG_VOLATILE)) {
1627 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
1628 printk(KERN_CONT " inactive");
1629 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
1630 printk(KERN_CONT " grabbed");
1631 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
1632 printk(KERN_CONT " volatile");
1633 }
1634 printk(KERN_CONT "\n");
1635 }
1636
1637 /* Log all controls owned by the handler */
1638 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1639 const char *prefix)
1640 {
1641 struct v4l2_ctrl *ctrl;
1642 const char *colon = "";
1643 int len;
1644
1645 if (hdl == NULL)
1646 return;
1647 if (prefix == NULL)
1648 prefix = "";
1649 len = strlen(prefix);
1650 if (len && prefix[len - 1] != ' ')
1651 colon = ": ";
1652 mutex_lock(&hdl->lock);
1653 list_for_each_entry(ctrl, &hdl->ctrls, node)
1654 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1655 log_ctrl(ctrl, prefix, colon);
1656 mutex_unlock(&hdl->lock);
1657 }
1658 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1659
1660 /* Call s_ctrl for all controls owned by the handler */
1661 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1662 {
1663 struct v4l2_ctrl *ctrl;
1664 int ret = 0;
1665
1666 if (hdl == NULL)
1667 return 0;
1668 mutex_lock(&hdl->lock);
1669 list_for_each_entry(ctrl, &hdl->ctrls, node)
1670 ctrl->done = false;
1671
1672 list_for_each_entry(ctrl, &hdl->ctrls, node) {
1673 struct v4l2_ctrl *master = ctrl->cluster[0];
1674 int i;
1675
1676 /* Skip if this control was already handled by a cluster. */
1677 /* Skip button controls and read-only controls. */
1678 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1679 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
1680 continue;
1681
1682 for (i = 0; i < master->ncontrols; i++) {
1683 if (master->cluster[i]) {
1684 cur_to_new(master->cluster[i]);
1685 master->cluster[i]->is_new = 1;
1686 master->cluster[i]->done = true;
1687 }
1688 }
1689 ret = call_op(master, s_ctrl);
1690 if (ret)
1691 break;
1692 }
1693 mutex_unlock(&hdl->lock);
1694 return ret;
1695 }
1696 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1697
1698 /* Implement VIDIOC_QUERYCTRL */
1699 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1700 {
1701 u32 id = qc->id & V4L2_CTRL_ID_MASK;
1702 struct v4l2_ctrl_ref *ref;
1703 struct v4l2_ctrl *ctrl;
1704
1705 if (hdl == NULL)
1706 return -EINVAL;
1707
1708 mutex_lock(&hdl->lock);
1709
1710 /* Try to find it */
1711 ref = find_ref(hdl, id);
1712
1713 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1714 /* Find the next control with ID > qc->id */
1715
1716 /* Did we reach the end of the control list? */
1717 if (id >= node2id(hdl->ctrl_refs.prev)) {
1718 ref = NULL; /* Yes, so there is no next control */
1719 } else if (ref) {
1720 /* We found a control with the given ID, so just get
1721 the next one in the list. */
1722 ref = list_entry(ref->node.next, typeof(*ref), node);
1723 } else {
1724 /* No control with the given ID exists, so start
1725 searching for the next largest ID. We know there
1726 is one, otherwise the first 'if' above would have
1727 been true. */
1728 list_for_each_entry(ref, &hdl->ctrl_refs, node)
1729 if (id < ref->ctrl->id)
1730 break;
1731 }
1732 }
1733 mutex_unlock(&hdl->lock);
1734 if (!ref)
1735 return -EINVAL;
1736
1737 ctrl = ref->ctrl;
1738 memset(qc, 0, sizeof(*qc));
1739 if (id >= V4L2_CID_PRIVATE_BASE)
1740 qc->id = id;
1741 else
1742 qc->id = ctrl->id;
1743 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1744 qc->minimum = ctrl->minimum;
1745 qc->maximum = ctrl->maximum;
1746 qc->default_value = ctrl->default_value;
1747 if (ctrl->type == V4L2_CTRL_TYPE_MENU)
1748 qc->step = 1;
1749 else
1750 qc->step = ctrl->step;
1751 qc->flags = ctrl->flags;
1752 qc->type = ctrl->type;
1753 return 0;
1754 }
1755 EXPORT_SYMBOL(v4l2_queryctrl);
1756
1757 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1758 {
1759 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
1760 return -EINVAL;
1761 return v4l2_queryctrl(sd->ctrl_handler, qc);
1762 }
1763 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1764
1765 /* Implement VIDIOC_QUERYMENU */
1766 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1767 {
1768 struct v4l2_ctrl *ctrl;
1769 u32 i = qm->index;
1770
1771 ctrl = v4l2_ctrl_find(hdl, qm->id);
1772 if (!ctrl)
1773 return -EINVAL;
1774
1775 qm->reserved = 0;
1776 /* Sanity checks */
1777 if (ctrl->qmenu == NULL ||
1778 i < ctrl->minimum || i > ctrl->maximum)
1779 return -EINVAL;
1780 /* Use mask to see if this menu item should be skipped */
1781 if (ctrl->menu_skip_mask & (1 << i))
1782 return -EINVAL;
1783 /* Empty menu items should also be skipped */
1784 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
1785 return -EINVAL;
1786 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
1787 return 0;
1788 }
1789 EXPORT_SYMBOL(v4l2_querymenu);
1790
1791 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
1792 {
1793 return v4l2_querymenu(sd->ctrl_handler, qm);
1794 }
1795 EXPORT_SYMBOL(v4l2_subdev_querymenu);
1796
1797
1798
1799 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
1800
1801 It is not a fully atomic operation, just best-effort only. After all, if
1802 multiple controls have to be set through multiple i2c writes (for example)
1803 then some initial writes may succeed while others fail. Thus leaving the
1804 system in an inconsistent state. The question is how much effort you are
1805 willing to spend on trying to make something atomic that really isn't.
1806
1807 From the point of view of an application the main requirement is that
1808 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
1809 error should be returned without actually affecting any controls.
1810
1811 If all the values are correct, then it is acceptable to just give up
1812 in case of low-level errors.
1813
1814 It is important though that the application can tell when only a partial
1815 configuration was done. The way we do that is through the error_idx field
1816 of struct v4l2_ext_controls: if that is equal to the count field then no
1817 controls were affected. Otherwise all controls before that index were
1818 successful in performing their 'get' or 'set' operation, the control at
1819 the given index failed, and you don't know what happened with the controls
1820 after the failed one. Since if they were part of a control cluster they
1821 could have been successfully processed (if a cluster member was encountered
1822 at index < error_idx), they could have failed (if a cluster member was at
1823 error_idx), or they may not have been processed yet (if the first cluster
1824 member appeared after error_idx).
1825
1826 It is all fairly theoretical, though. In practice all you can do is to
1827 bail out. If error_idx == count, then it is an application bug. If
1828 error_idx < count then it is only an application bug if the error code was
1829 EBUSY. That usually means that something started streaming just when you
1830 tried to set the controls. In all other cases it is a driver/hardware
1831 problem and all you can do is to retry or bail out.
1832
1833 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
1834 never modifies controls the error_idx is just set to whatever control
1835 has an invalid value.
1836 */
1837
1838 /* Prepare for the extended g/s/try functions.
1839 Find the controls in the control array and do some basic checks. */
1840 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1841 struct v4l2_ext_controls *cs,
1842 struct v4l2_ctrl_helper *helpers)
1843 {
1844 struct v4l2_ctrl_helper *h;
1845 bool have_clusters = false;
1846 u32 i;
1847
1848 for (i = 0, h = helpers; i < cs->count; i++, h++) {
1849 struct v4l2_ext_control *c = &cs->controls[i];
1850 struct v4l2_ctrl_ref *ref;
1851 struct v4l2_ctrl *ctrl;
1852 u32 id = c->id & V4L2_CTRL_ID_MASK;
1853
1854 cs->error_idx = i;
1855
1856 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
1857 return -EINVAL;
1858
1859 /* Old-style private controls are not allowed for
1860 extended controls */
1861 if (id >= V4L2_CID_PRIVATE_BASE)
1862 return -EINVAL;
1863 ref = find_ref_lock(hdl, id);
1864 if (ref == NULL)
1865 return -EINVAL;
1866 ctrl = ref->ctrl;
1867 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
1868 return -EINVAL;
1869
1870 if (ctrl->cluster[0]->ncontrols > 1)
1871 have_clusters = true;
1872 if (ctrl->cluster[0] != ctrl)
1873 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
1874 /* Store the ref to the master control of the cluster */
1875 h->mref = ref;
1876 h->ctrl = ctrl;
1877 /* Initially set next to 0, meaning that there is no other
1878 control in this helper array belonging to the same
1879 cluster */
1880 h->next = 0;
1881 }
1882
1883 /* We are done if there were no controls that belong to a multi-
1884 control cluster. */
1885 if (!have_clusters)
1886 return 0;
1887
1888 /* The code below figures out in O(n) time which controls in the list
1889 belong to the same cluster. */
1890
1891 /* This has to be done with the handler lock taken. */
1892 mutex_lock(&hdl->lock);
1893
1894 /* First zero the helper field in the master control references */
1895 for (i = 0; i < cs->count; i++)
1896 helpers[i].mref->helper = 0;
1897 for (i = 0, h = helpers; i < cs->count; i++, h++) {
1898 struct v4l2_ctrl_ref *mref = h->mref;
1899
1900 /* If the mref->helper is set, then it points to an earlier
1901 helper that belongs to the same cluster. */
1902 if (mref->helper) {
1903 /* Set the next field of mref->helper to the current
1904 index: this means that that earlier helper now
1905 points to the next helper in the same cluster. */
1906 mref->helper->next = i;
1907 /* mref should be set only for the first helper in the
1908 cluster, clear the others. */
1909 h->mref = NULL;
1910 }
1911 /* Point the mref helper to the current helper struct. */
1912 mref->helper = h;
1913 }
1914 mutex_unlock(&hdl->lock);
1915 return 0;
1916 }
1917
1918 /* Handles the corner case where cs->count == 0. It checks whether the
1919 specified control class exists. If that class ID is 0, then it checks
1920 whether there are any controls at all. */
1921 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
1922 {
1923 if (ctrl_class == 0)
1924 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
1925 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
1926 }
1927
1928
1929
1930 /* Get extended controls. Allocates the helpers array if needed. */
1931 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1932 {
1933 struct v4l2_ctrl_helper helper[4];
1934 struct v4l2_ctrl_helper *helpers = helper;
1935 int ret;
1936 int i, j;
1937
1938 cs->error_idx = cs->count;
1939 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1940
1941 if (hdl == NULL)
1942 return -EINVAL;
1943
1944 if (cs->count == 0)
1945 return class_check(hdl, cs->ctrl_class);
1946
1947 if (cs->count > ARRAY_SIZE(helper)) {
1948 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1949 if (helpers == NULL)
1950 return -ENOMEM;
1951 }
1952
1953 ret = prepare_ext_ctrls(hdl, cs, helpers);
1954 cs->error_idx = cs->count;
1955
1956 for (i = 0; !ret && i < cs->count; i++)
1957 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1958 ret = -EACCES;
1959
1960 for (i = 0; !ret && i < cs->count; i++) {
1961 int (*ctrl_to_user)(struct v4l2_ext_control *c,
1962 struct v4l2_ctrl *ctrl) = cur_to_user;
1963 struct v4l2_ctrl *master;
1964
1965 if (helpers[i].mref == NULL)
1966 continue;
1967
1968 master = helpers[i].mref->ctrl;
1969 cs->error_idx = i;
1970
1971 v4l2_ctrl_lock(master);
1972
1973 /* g_volatile_ctrl will update the new control values */
1974 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
1975 (master->has_volatiles && !is_cur_manual(master))) {
1976 for (j = 0; j < master->ncontrols; j++)
1977 cur_to_new(master->cluster[j]);
1978 ret = call_op(master, g_volatile_ctrl);
1979 ctrl_to_user = new_to_user;
1980 }
1981 /* If OK, then copy the current (for non-volatile controls)
1982 or the new (for volatile controls) control values to the
1983 caller */
1984 if (!ret) {
1985 u32 idx = i;
1986
1987 do {
1988 ret = ctrl_to_user(cs->controls + idx,
1989 helpers[idx].ctrl);
1990 idx = helpers[idx].next;
1991 } while (!ret && idx);
1992 }
1993 v4l2_ctrl_unlock(master);
1994 }
1995
1996 if (cs->count > ARRAY_SIZE(helper))
1997 kfree(helpers);
1998 return ret;
1999 }
2000 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2001
2002 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2003 {
2004 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2005 }
2006 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2007
2008 /* Helper function to get a single control */
2009 static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
2010 {
2011 struct v4l2_ctrl *master = ctrl->cluster[0];
2012 int ret = 0;
2013 int i;
2014
2015 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2016 return -EACCES;
2017
2018 v4l2_ctrl_lock(master);
2019 /* g_volatile_ctrl will update the current control values */
2020 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2021 for (i = 0; i < master->ncontrols; i++)
2022 cur_to_new(master->cluster[i]);
2023 ret = call_op(master, g_volatile_ctrl);
2024 *val = ctrl->val;
2025 } else {
2026 *val = ctrl->cur.val;
2027 }
2028 v4l2_ctrl_unlock(master);
2029 return ret;
2030 }
2031
2032 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2033 {
2034 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2035
2036 if (ctrl == NULL || !type_is_int(ctrl))
2037 return -EINVAL;
2038 return get_ctrl(ctrl, &control->value);
2039 }
2040 EXPORT_SYMBOL(v4l2_g_ctrl);
2041
2042 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2043 {
2044 return v4l2_g_ctrl(sd->ctrl_handler, control);
2045 }
2046 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2047
2048 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2049 {
2050 s32 val = 0;
2051
2052 /* It's a driver bug if this happens. */
2053 WARN_ON(!type_is_int(ctrl));
2054 get_ctrl(ctrl, &val);
2055 return val;
2056 }
2057 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2058
2059
2060 /* Core function that calls try/s_ctrl and ensures that the new value is
2061 copied to the current value on a set.
2062 Must be called with ctrl->handler->lock held. */
2063 static int try_or_set_cluster(struct v4l2_fh *fh,
2064 struct v4l2_ctrl *master, bool set)
2065 {
2066 bool update_flag;
2067 int ret;
2068 int i;
2069
2070 /* Go through the cluster and either validate the new value or
2071 (if no new value was set), copy the current value to the new
2072 value, ensuring a consistent view for the control ops when
2073 called. */
2074 for (i = 0; i < master->ncontrols; i++) {
2075 struct v4l2_ctrl *ctrl = master->cluster[i];
2076
2077 if (ctrl == NULL)
2078 continue;
2079
2080 if (!ctrl->is_new) {
2081 cur_to_new(ctrl);
2082 continue;
2083 }
2084 /* Check again: it may have changed since the
2085 previous check in try_or_set_ext_ctrls(). */
2086 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2087 return -EBUSY;
2088 }
2089
2090 ret = call_op(master, try_ctrl);
2091
2092 /* Don't set if there is no change */
2093 if (ret || !set || !cluster_changed(master))
2094 return ret;
2095 ret = call_op(master, s_ctrl);
2096 if (ret)
2097 return ret;
2098
2099 /* If OK, then make the new values permanent. */
2100 update_flag = is_cur_manual(master) != is_new_manual(master);
2101 for (i = 0; i < master->ncontrols; i++)
2102 new_to_cur(fh, master->cluster[i], update_flag && i > 0);
2103 return 0;
2104 }
2105
2106 /* Validate controls. */
2107 static int validate_ctrls(struct v4l2_ext_controls *cs,
2108 struct v4l2_ctrl_helper *helpers, bool set)
2109 {
2110 unsigned i;
2111 int ret = 0;
2112
2113 cs->error_idx = cs->count;
2114 for (i = 0; i < cs->count; i++) {
2115 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2116
2117 cs->error_idx = i;
2118
2119 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2120 return -EACCES;
2121 /* This test is also done in try_set_control_cluster() which
2122 is called in atomic context, so that has the final say,
2123 but it makes sense to do an up-front check as well. Once
2124 an error occurs in try_set_control_cluster() some other
2125 controls may have been set already and we want to do a
2126 best-effort to avoid that. */
2127 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2128 return -EBUSY;
2129 ret = validate_new(ctrl, &cs->controls[i]);
2130 if (ret)
2131 return ret;
2132 }
2133 return 0;
2134 }
2135
2136 /* Obtain the current volatile values of an autocluster and mark them
2137 as new. */
2138 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2139 {
2140 int i;
2141
2142 for (i = 0; i < master->ncontrols; i++)
2143 cur_to_new(master->cluster[i]);
2144 if (!call_op(master, g_volatile_ctrl))
2145 for (i = 1; i < master->ncontrols; i++)
2146 if (master->cluster[i])
2147 master->cluster[i]->is_new = 1;
2148 }
2149
2150 /* Try or try-and-set controls */
2151 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2152 struct v4l2_ext_controls *cs,
2153 bool set)
2154 {
2155 struct v4l2_ctrl_helper helper[4];
2156 struct v4l2_ctrl_helper *helpers = helper;
2157 unsigned i, j;
2158 int ret;
2159
2160 cs->error_idx = cs->count;
2161 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2162
2163 if (hdl == NULL)
2164 return -EINVAL;
2165
2166 if (cs->count == 0)
2167 return class_check(hdl, cs->ctrl_class);
2168
2169 if (cs->count > ARRAY_SIZE(helper)) {
2170 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
2171 if (!helpers)
2172 return -ENOMEM;
2173 }
2174 ret = prepare_ext_ctrls(hdl, cs, helpers);
2175 if (!ret)
2176 ret = validate_ctrls(cs, helpers, set);
2177 if (ret && set)
2178 cs->error_idx = cs->count;
2179 for (i = 0; !ret && i < cs->count; i++) {
2180 struct v4l2_ctrl *master;
2181 u32 idx = i;
2182
2183 if (helpers[i].mref == NULL)
2184 continue;
2185
2186 cs->error_idx = i;
2187 master = helpers[i].mref->ctrl;
2188 v4l2_ctrl_lock(master);
2189
2190 /* Reset the 'is_new' flags of the cluster */
2191 for (j = 0; j < master->ncontrols; j++)
2192 if (master->cluster[j])
2193 master->cluster[j]->is_new = 0;
2194
2195 /* For volatile autoclusters that are currently in auto mode
2196 we need to discover if it will be set to manual mode.
2197 If so, then we have to copy the current volatile values
2198 first since those will become the new manual values (which
2199 may be overwritten by explicit new values from this set
2200 of controls). */
2201 if (master->is_auto && master->has_volatiles &&
2202 !is_cur_manual(master)) {
2203 /* Pick an initial non-manual value */
2204 s32 new_auto_val = master->manual_mode_value + 1;
2205 u32 tmp_idx = idx;
2206
2207 do {
2208 /* Check if the auto control is part of the
2209 list, and remember the new value. */
2210 if (helpers[tmp_idx].ctrl == master)
2211 new_auto_val = cs->controls[tmp_idx].value;
2212 tmp_idx = helpers[tmp_idx].next;
2213 } while (tmp_idx);
2214 /* If the new value == the manual value, then copy
2215 the current volatile values. */
2216 if (new_auto_val == master->manual_mode_value)
2217 update_from_auto_cluster(master);
2218 }
2219
2220 /* Copy the new caller-supplied control values.
2221 user_to_new() sets 'is_new' to 1. */
2222 do {
2223 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2224 idx = helpers[idx].next;
2225 } while (!ret && idx);
2226
2227 if (!ret)
2228 ret = try_or_set_cluster(fh, master, set);
2229
2230 /* Copy the new values back to userspace. */
2231 if (!ret) {
2232 idx = i;
2233 do {
2234 ret = new_to_user(cs->controls + idx,
2235 helpers[idx].ctrl);
2236 idx = helpers[idx].next;
2237 } while (!ret && idx);
2238 }
2239 v4l2_ctrl_unlock(master);
2240 }
2241
2242 if (cs->count > ARRAY_SIZE(helper))
2243 kfree(helpers);
2244 return ret;
2245 }
2246
2247 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2248 {
2249 return try_set_ext_ctrls(NULL, hdl, cs, false);
2250 }
2251 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2252
2253 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2254 struct v4l2_ext_controls *cs)
2255 {
2256 return try_set_ext_ctrls(fh, hdl, cs, true);
2257 }
2258 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2259
2260 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2261 {
2262 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2263 }
2264 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2265
2266 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2267 {
2268 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2269 }
2270 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2271
2272 /* Helper function for VIDIOC_S_CTRL compatibility */
2273 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val)
2274 {
2275 struct v4l2_ctrl *master = ctrl->cluster[0];
2276 int ret;
2277 int i;
2278
2279 ret = validate_new_int(ctrl, val);
2280 if (ret)
2281 return ret;
2282
2283 v4l2_ctrl_lock(ctrl);
2284
2285 /* Reset the 'is_new' flags of the cluster */
2286 for (i = 0; i < master->ncontrols; i++)
2287 if (master->cluster[i])
2288 master->cluster[i]->is_new = 0;
2289
2290 /* For autoclusters with volatiles that are switched from auto to
2291 manual mode we have to update the current volatile values since
2292 those will become the initial manual values after such a switch. */
2293 if (master->is_auto && master->has_volatiles && ctrl == master &&
2294 !is_cur_manual(master) && *val == master->manual_mode_value)
2295 update_from_auto_cluster(master);
2296 ctrl->val = *val;
2297 ctrl->is_new = 1;
2298 ret = try_or_set_cluster(fh, master, true);
2299 *val = ctrl->cur.val;
2300 v4l2_ctrl_unlock(ctrl);
2301 return ret;
2302 }
2303
2304 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2305 struct v4l2_control *control)
2306 {
2307 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2308
2309 if (ctrl == NULL || !type_is_int(ctrl))
2310 return -EINVAL;
2311
2312 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2313 return -EACCES;
2314
2315 return set_ctrl(fh, ctrl, &control->value);
2316 }
2317 EXPORT_SYMBOL(v4l2_s_ctrl);
2318
2319 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2320 {
2321 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2322 }
2323 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2324
2325 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2326 {
2327 /* It's a driver bug if this happens. */
2328 WARN_ON(!type_is_int(ctrl));
2329 return set_ctrl(NULL, ctrl, &val);
2330 }
2331 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2332
2333 void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl,
2334 struct v4l2_subscribed_event *sev)
2335 {
2336 v4l2_ctrl_lock(ctrl);
2337 list_add_tail(&sev->node, &ctrl->ev_subs);
2338 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2339 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2340 struct v4l2_event ev;
2341 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2342
2343 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2344 changes |= V4L2_EVENT_CTRL_CH_VALUE;
2345 fill_event(&ev, ctrl, changes);
2346 v4l2_event_queue_fh(sev->fh, &ev);
2347 }
2348 v4l2_ctrl_unlock(ctrl);
2349 }
2350 EXPORT_SYMBOL(v4l2_ctrl_add_event);
2351
2352 void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
2353 struct v4l2_subscribed_event *sev)
2354 {
2355 v4l2_ctrl_lock(ctrl);
2356 list_del(&sev->node);
2357 v4l2_ctrl_unlock(ctrl);
2358 }
2359 EXPORT_SYMBOL(v4l2_ctrl_del_event);
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