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[media] v4l2-ctrls: Teach v4l2-ctrls that V4L2_CID_AUTOBRIGHTNESS is a boolean
[GitHub/mt8127/android_kernel_alcatel_ttab.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_audio_dec_playback[] = {
179 "Auto",
180 "Stereo",
181 "Left",
182 "Right",
183 "Mono",
184 "Swapped Stereo",
185 NULL
186 };
187 static const char * const mpeg_video_encoding[] = {
188 "MPEG-1",
189 "MPEG-2",
190 "MPEG-4 AVC",
191 NULL
192 };
193 static const char * const mpeg_video_aspect[] = {
194 "1x1",
195 "4x3",
196 "16x9",
197 "2.21x1",
198 NULL
199 };
200 static const char * const mpeg_video_bitrate_mode[] = {
201 "Variable Bitrate",
202 "Constant Bitrate",
203 NULL
204 };
205 static const char * const mpeg_stream_type[] = {
206 "MPEG-2 Program Stream",
207 "MPEG-2 Transport Stream",
208 "MPEG-1 System Stream",
209 "MPEG-2 DVD-compatible Stream",
210 "MPEG-1 VCD-compatible Stream",
211 "MPEG-2 SVCD-compatible Stream",
212 NULL
213 };
214 static const char * const mpeg_stream_vbi_fmt[] = {
215 "No VBI",
216 "Private Packet, IVTV Format",
217 NULL
218 };
219 static const char * const camera_power_line_frequency[] = {
220 "Disabled",
221 "50 Hz",
222 "60 Hz",
223 "Auto",
224 NULL
225 };
226 static const char * const camera_exposure_auto[] = {
227 "Auto Mode",
228 "Manual Mode",
229 "Shutter Priority Mode",
230 "Aperture Priority Mode",
231 NULL
232 };
233 static const char * const camera_exposure_metering[] = {
234 "Average",
235 "Center Weighted",
236 "Spot",
237 NULL
238 };
239 static const char * const camera_auto_focus_range[] = {
240 "Auto",
241 "Normal",
242 "Macro",
243 "Infinity",
244 NULL
245 };
246 static const char * const colorfx[] = {
247 "None",
248 "Black & White",
249 "Sepia",
250 "Negative",
251 "Emboss",
252 "Sketch",
253 "Sky Blue",
254 "Grass Green",
255 "Skin Whiten",
256 "Vivid",
257 "Aqua",
258 "Art Freeze",
259 "Silhouette",
260 "Solarization",
261 "Antique",
262 "Set Cb/Cr",
263 NULL
264 };
265 static const char * const auto_n_preset_white_balance[] = {
266 "Manual",
267 "Auto",
268 "Incandescent",
269 "Fluorescent",
270 "Fluorescent H",
271 "Horizon",
272 "Daylight",
273 "Flash",
274 "Cloudy",
275 "Shade",
276 NULL,
277 };
278 static const char * const camera_iso_sensitivity_auto[] = {
279 "Manual",
280 "Auto",
281 NULL
282 };
283 static const char * const scene_mode[] = {
284 "None",
285 "Backlight",
286 "Beach/Snow",
287 "Candle Light",
288 "Dusk/Dawn",
289 "Fall Colors",
290 "Fireworks",
291 "Landscape",
292 "Night",
293 "Party/Indoor",
294 "Portrait",
295 "Sports",
296 "Sunset",
297 "Text",
298 NULL
299 };
300 static const char * const tune_preemphasis[] = {
301 "No Preemphasis",
302 "50 Microseconds",
303 "75 Microseconds",
304 NULL,
305 };
306 static const char * const header_mode[] = {
307 "Separate Buffer",
308 "Joined With 1st Frame",
309 NULL,
310 };
311 static const char * const multi_slice[] = {
312 "Single",
313 "Max Macroblocks",
314 "Max Bytes",
315 NULL,
316 };
317 static const char * const entropy_mode[] = {
318 "CAVLC",
319 "CABAC",
320 NULL,
321 };
322 static const char * const mpeg_h264_level[] = {
323 "1",
324 "1b",
325 "1.1",
326 "1.2",
327 "1.3",
328 "2",
329 "2.1",
330 "2.2",
331 "3",
332 "3.1",
333 "3.2",
334 "4",
335 "4.1",
336 "4.2",
337 "5",
338 "5.1",
339 NULL,
340 };
341 static const char * const h264_loop_filter[] = {
342 "Enabled",
343 "Disabled",
344 "Disabled at Slice Boundary",
345 NULL,
346 };
347 static const char * const h264_profile[] = {
348 "Baseline",
349 "Constrained Baseline",
350 "Main",
351 "Extended",
352 "High",
353 "High 10",
354 "High 422",
355 "High 444 Predictive",
356 "High 10 Intra",
357 "High 422 Intra",
358 "High 444 Intra",
359 "CAVLC 444 Intra",
360 "Scalable Baseline",
361 "Scalable High",
362 "Scalable High Intra",
363 "Multiview High",
364 NULL,
365 };
366 static const char * const vui_sar_idc[] = {
367 "Unspecified",
368 "1:1",
369 "12:11",
370 "10:11",
371 "16:11",
372 "40:33",
373 "24:11",
374 "20:11",
375 "32:11",
376 "80:33",
377 "18:11",
378 "15:11",
379 "64:33",
380 "160:99",
381 "4:3",
382 "3:2",
383 "2:1",
384 "Extended SAR",
385 NULL,
386 };
387 static const char * const mpeg_mpeg4_level[] = {
388 "0",
389 "0b",
390 "1",
391 "2",
392 "3",
393 "3b",
394 "4",
395 "5",
396 NULL,
397 };
398 static const char * const mpeg4_profile[] = {
399 "Simple",
400 "Advanced Simple",
401 "Core",
402 "Simple Scalable",
403 "Advanced Coding Efficency",
404 NULL,
405 };
406
407 static const char * const flash_led_mode[] = {
408 "Off",
409 "Flash",
410 "Torch",
411 NULL,
412 };
413 static const char * const flash_strobe_source[] = {
414 "Software",
415 "External",
416 NULL,
417 };
418
419 static const char * const jpeg_chroma_subsampling[] = {
420 "4:4:4",
421 "4:2:2",
422 "4:2:0",
423 "4:1:1",
424 "4:1:0",
425 "Gray",
426 NULL,
427 };
428
429 switch (id) {
430 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
431 return mpeg_audio_sampling_freq;
432 case V4L2_CID_MPEG_AUDIO_ENCODING:
433 return mpeg_audio_encoding;
434 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
435 return mpeg_audio_l1_bitrate;
436 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
437 return mpeg_audio_l2_bitrate;
438 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
439 return mpeg_audio_l3_bitrate;
440 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
441 return mpeg_audio_ac3_bitrate;
442 case V4L2_CID_MPEG_AUDIO_MODE:
443 return mpeg_audio_mode;
444 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
445 return mpeg_audio_mode_extension;
446 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
447 return mpeg_audio_emphasis;
448 case V4L2_CID_MPEG_AUDIO_CRC:
449 return mpeg_audio_crc;
450 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
451 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
452 return mpeg_audio_dec_playback;
453 case V4L2_CID_MPEG_VIDEO_ENCODING:
454 return mpeg_video_encoding;
455 case V4L2_CID_MPEG_VIDEO_ASPECT:
456 return mpeg_video_aspect;
457 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
458 return mpeg_video_bitrate_mode;
459 case V4L2_CID_MPEG_STREAM_TYPE:
460 return mpeg_stream_type;
461 case V4L2_CID_MPEG_STREAM_VBI_FMT:
462 return mpeg_stream_vbi_fmt;
463 case V4L2_CID_POWER_LINE_FREQUENCY:
464 return camera_power_line_frequency;
465 case V4L2_CID_EXPOSURE_AUTO:
466 return camera_exposure_auto;
467 case V4L2_CID_EXPOSURE_METERING:
468 return camera_exposure_metering;
469 case V4L2_CID_AUTO_FOCUS_RANGE:
470 return camera_auto_focus_range;
471 case V4L2_CID_COLORFX:
472 return colorfx;
473 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
474 return auto_n_preset_white_balance;
475 case V4L2_CID_ISO_SENSITIVITY_AUTO:
476 return camera_iso_sensitivity_auto;
477 case V4L2_CID_SCENE_MODE:
478 return scene_mode;
479 case V4L2_CID_TUNE_PREEMPHASIS:
480 return tune_preemphasis;
481 case V4L2_CID_FLASH_LED_MODE:
482 return flash_led_mode;
483 case V4L2_CID_FLASH_STROBE_SOURCE:
484 return flash_strobe_source;
485 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
486 return header_mode;
487 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
488 return multi_slice;
489 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
490 return entropy_mode;
491 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
492 return mpeg_h264_level;
493 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
494 return h264_loop_filter;
495 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
496 return h264_profile;
497 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
498 return vui_sar_idc;
499 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
500 return mpeg_mpeg4_level;
501 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
502 return mpeg4_profile;
503 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
504 return jpeg_chroma_subsampling;
505
506 default:
507 return NULL;
508 }
509 }
510 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
511
512 /* Return the control name. */
513 const char *v4l2_ctrl_get_name(u32 id)
514 {
515 switch (id) {
516 /* USER controls */
517 /* Keep the order of the 'case's the same as in videodev2.h! */
518 case V4L2_CID_USER_CLASS: return "User Controls";
519 case V4L2_CID_BRIGHTNESS: return "Brightness";
520 case V4L2_CID_CONTRAST: return "Contrast";
521 case V4L2_CID_SATURATION: return "Saturation";
522 case V4L2_CID_HUE: return "Hue";
523 case V4L2_CID_AUDIO_VOLUME: return "Volume";
524 case V4L2_CID_AUDIO_BALANCE: return "Balance";
525 case V4L2_CID_AUDIO_BASS: return "Bass";
526 case V4L2_CID_AUDIO_TREBLE: return "Treble";
527 case V4L2_CID_AUDIO_MUTE: return "Mute";
528 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
529 case V4L2_CID_BLACK_LEVEL: return "Black Level";
530 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
531 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
532 case V4L2_CID_RED_BALANCE: return "Red Balance";
533 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
534 case V4L2_CID_GAMMA: return "Gamma";
535 case V4L2_CID_EXPOSURE: return "Exposure";
536 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
537 case V4L2_CID_GAIN: return "Gain";
538 case V4L2_CID_HFLIP: return "Horizontal Flip";
539 case V4L2_CID_VFLIP: return "Vertical Flip";
540 case V4L2_CID_HCENTER: return "Horizontal Center";
541 case V4L2_CID_VCENTER: return "Vertical Center";
542 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
543 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
544 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
545 case V4L2_CID_SHARPNESS: return "Sharpness";
546 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
547 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
548 case V4L2_CID_COLOR_KILLER: return "Color Killer";
549 case V4L2_CID_COLORFX: return "Color Effects";
550 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
551 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
552 case V4L2_CID_ROTATE: return "Rotate";
553 case V4L2_CID_BG_COLOR: return "Background Color";
554 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
555 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
556 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
557 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
558 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
559 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
560 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
561
562 /* MPEG controls */
563 /* Keep the order of the 'case's the same as in videodev2.h! */
564 case V4L2_CID_MPEG_CLASS: return "MPEG Encoder Controls";
565 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
566 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
567 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
568 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
569 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
570 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
571 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
572 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
573 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
574 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
575 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
576 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
577 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
578 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
579 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
580 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
581 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
582 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
583 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
584 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
585 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
586 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
587 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
588 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
589 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
590 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
591 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
592 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
593 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
594 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
595 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
596 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
597 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
598 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
599 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
600 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
601 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
602 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
603 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
604 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
605 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
606 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
607 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
608 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
609 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
610 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
611 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
612 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
613 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
614 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
615 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
616 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
617 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
618 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
619 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
620 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
621 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
622 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
623 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
624 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
625 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
626 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
627 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
628 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
629 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
630 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
631 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
632 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
633 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
634 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
635 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
636 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
637 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
638 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
639 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
640 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
641 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
642 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
643
644 /* CAMERA controls */
645 /* Keep the order of the 'case's the same as in videodev2.h! */
646 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
647 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
648 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
649 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
650 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
651 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
652 case V4L2_CID_PAN_RESET: return "Pan, Reset";
653 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
654 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
655 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
656 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
657 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
658 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
659 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
660 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
661 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
662 case V4L2_CID_PRIVACY: return "Privacy";
663 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
664 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
665 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
666 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
667 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
668 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
669 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
670 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
671 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
672 case V4L2_CID_SCENE_MODE: return "Scene Mode";
673 case V4L2_CID_3A_LOCK: return "3A Lock";
674 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
675 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
676 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
677 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
678
679 /* FM Radio Modulator control */
680 /* Keep the order of the 'case's the same as in videodev2.h! */
681 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
682 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
683 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
684 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
685 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
686 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
687 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
688 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
689 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
690 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
691 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
692 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
693 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
694 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
695 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
696 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
697 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
698 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
699 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
700 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
701
702 /* Flash controls */
703 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
704 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
705 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
706 case V4L2_CID_FLASH_STROBE: return "Strobe";
707 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
708 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
709 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
710 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
711 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
712 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
713 case V4L2_CID_FLASH_FAULT: return "Faults";
714 case V4L2_CID_FLASH_CHARGE: return "Charge";
715 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
716
717 /* JPEG encoder controls */
718 /* Keep the order of the 'case's the same as in videodev2.h! */
719 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
720 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
721 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
722 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
723 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
724
725 /* Image source controls */
726 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
727 case V4L2_CID_VBLANK: return "Vertical Blanking";
728 case V4L2_CID_HBLANK: return "Horizontal Blanking";
729 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
730
731 /* Image processing controls */
732 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
733 case V4L2_CID_LINK_FREQ: return "Link Frequency";
734 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
735
736 default:
737 return NULL;
738 }
739 }
740 EXPORT_SYMBOL(v4l2_ctrl_get_name);
741
742 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
743 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
744 {
745 *name = v4l2_ctrl_get_name(id);
746 *flags = 0;
747
748 switch (id) {
749 case V4L2_CID_AUDIO_MUTE:
750 case V4L2_CID_AUDIO_LOUDNESS:
751 case V4L2_CID_AUTO_WHITE_BALANCE:
752 case V4L2_CID_AUTOGAIN:
753 case V4L2_CID_HFLIP:
754 case V4L2_CID_VFLIP:
755 case V4L2_CID_HUE_AUTO:
756 case V4L2_CID_CHROMA_AGC:
757 case V4L2_CID_COLOR_KILLER:
758 case V4L2_CID_AUTOBRIGHTNESS:
759 case V4L2_CID_MPEG_AUDIO_MUTE:
760 case V4L2_CID_MPEG_VIDEO_MUTE:
761 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
762 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
763 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
764 case V4L2_CID_FOCUS_AUTO:
765 case V4L2_CID_PRIVACY:
766 case V4L2_CID_AUDIO_LIMITER_ENABLED:
767 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
768 case V4L2_CID_PILOT_TONE_ENABLED:
769 case V4L2_CID_ILLUMINATORS_1:
770 case V4L2_CID_ILLUMINATORS_2:
771 case V4L2_CID_FLASH_STROBE_STATUS:
772 case V4L2_CID_FLASH_CHARGE:
773 case V4L2_CID_FLASH_READY:
774 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
775 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
776 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
777 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
778 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
779 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
780 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
781 case V4L2_CID_WIDE_DYNAMIC_RANGE:
782 case V4L2_CID_IMAGE_STABILIZATION:
783 *type = V4L2_CTRL_TYPE_BOOLEAN;
784 *min = 0;
785 *max = *step = 1;
786 break;
787 case V4L2_CID_PAN_RESET:
788 case V4L2_CID_TILT_RESET:
789 case V4L2_CID_FLASH_STROBE:
790 case V4L2_CID_FLASH_STROBE_STOP:
791 case V4L2_CID_AUTO_FOCUS_START:
792 case V4L2_CID_AUTO_FOCUS_STOP:
793 *type = V4L2_CTRL_TYPE_BUTTON;
794 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
795 *min = *max = *step = *def = 0;
796 break;
797 case V4L2_CID_POWER_LINE_FREQUENCY:
798 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
799 case V4L2_CID_MPEG_AUDIO_ENCODING:
800 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
801 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
802 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
803 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
804 case V4L2_CID_MPEG_AUDIO_MODE:
805 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
806 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
807 case V4L2_CID_MPEG_AUDIO_CRC:
808 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
809 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
810 case V4L2_CID_MPEG_VIDEO_ENCODING:
811 case V4L2_CID_MPEG_VIDEO_ASPECT:
812 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
813 case V4L2_CID_MPEG_STREAM_TYPE:
814 case V4L2_CID_MPEG_STREAM_VBI_FMT:
815 case V4L2_CID_EXPOSURE_AUTO:
816 case V4L2_CID_AUTO_FOCUS_RANGE:
817 case V4L2_CID_COLORFX:
818 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
819 case V4L2_CID_TUNE_PREEMPHASIS:
820 case V4L2_CID_FLASH_LED_MODE:
821 case V4L2_CID_FLASH_STROBE_SOURCE:
822 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
823 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
824 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
825 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
826 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
827 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
828 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
829 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
830 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
831 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
832 case V4L2_CID_ISO_SENSITIVITY_AUTO:
833 case V4L2_CID_EXPOSURE_METERING:
834 case V4L2_CID_SCENE_MODE:
835 *type = V4L2_CTRL_TYPE_MENU;
836 break;
837 case V4L2_CID_LINK_FREQ:
838 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
839 break;
840 case V4L2_CID_RDS_TX_PS_NAME:
841 case V4L2_CID_RDS_TX_RADIO_TEXT:
842 *type = V4L2_CTRL_TYPE_STRING;
843 break;
844 case V4L2_CID_ISO_SENSITIVITY:
845 case V4L2_CID_AUTO_EXPOSURE_BIAS:
846 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
847 break;
848 case V4L2_CID_USER_CLASS:
849 case V4L2_CID_CAMERA_CLASS:
850 case V4L2_CID_MPEG_CLASS:
851 case V4L2_CID_FM_TX_CLASS:
852 case V4L2_CID_FLASH_CLASS:
853 case V4L2_CID_JPEG_CLASS:
854 case V4L2_CID_IMAGE_SOURCE_CLASS:
855 case V4L2_CID_IMAGE_PROC_CLASS:
856 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
857 /* You can neither read not write these */
858 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
859 *min = *max = *step = *def = 0;
860 break;
861 case V4L2_CID_BG_COLOR:
862 *type = V4L2_CTRL_TYPE_INTEGER;
863 *step = 1;
864 *min = 0;
865 /* Max is calculated as RGB888 that is 2^24 */
866 *max = 0xFFFFFF;
867 break;
868 case V4L2_CID_FLASH_FAULT:
869 case V4L2_CID_JPEG_ACTIVE_MARKER:
870 case V4L2_CID_3A_LOCK:
871 case V4L2_CID_AUTO_FOCUS_STATUS:
872 *type = V4L2_CTRL_TYPE_BITMASK;
873 break;
874 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
875 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
876 *type = V4L2_CTRL_TYPE_INTEGER;
877 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
878 break;
879 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
880 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
881 *flags |= V4L2_CTRL_FLAG_VOLATILE;
882 /* Fall through */
883 case V4L2_CID_PIXEL_RATE:
884 *type = V4L2_CTRL_TYPE_INTEGER64;
885 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
886 *min = *max = *step = *def = 0;
887 break;
888 default:
889 *type = V4L2_CTRL_TYPE_INTEGER;
890 break;
891 }
892 switch (id) {
893 case V4L2_CID_MPEG_AUDIO_ENCODING:
894 case V4L2_CID_MPEG_AUDIO_MODE:
895 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
896 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
897 case V4L2_CID_MPEG_STREAM_TYPE:
898 *flags |= V4L2_CTRL_FLAG_UPDATE;
899 break;
900 case V4L2_CID_AUDIO_VOLUME:
901 case V4L2_CID_AUDIO_BALANCE:
902 case V4L2_CID_AUDIO_BASS:
903 case V4L2_CID_AUDIO_TREBLE:
904 case V4L2_CID_BRIGHTNESS:
905 case V4L2_CID_CONTRAST:
906 case V4L2_CID_SATURATION:
907 case V4L2_CID_HUE:
908 case V4L2_CID_RED_BALANCE:
909 case V4L2_CID_BLUE_BALANCE:
910 case V4L2_CID_GAMMA:
911 case V4L2_CID_SHARPNESS:
912 case V4L2_CID_CHROMA_GAIN:
913 case V4L2_CID_RDS_TX_DEVIATION:
914 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
915 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
916 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
917 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
918 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
919 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
920 case V4L2_CID_PILOT_TONE_DEVIATION:
921 case V4L2_CID_PILOT_TONE_FREQUENCY:
922 case V4L2_CID_TUNE_POWER_LEVEL:
923 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
924 *flags |= V4L2_CTRL_FLAG_SLIDER;
925 break;
926 case V4L2_CID_PAN_RELATIVE:
927 case V4L2_CID_TILT_RELATIVE:
928 case V4L2_CID_FOCUS_RELATIVE:
929 case V4L2_CID_IRIS_RELATIVE:
930 case V4L2_CID_ZOOM_RELATIVE:
931 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
932 break;
933 case V4L2_CID_FLASH_STROBE_STATUS:
934 case V4L2_CID_AUTO_FOCUS_STATUS:
935 case V4L2_CID_FLASH_READY:
936 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
937 break;
938 }
939 }
940 EXPORT_SYMBOL(v4l2_ctrl_fill);
941
942 /* Helper function to determine whether the control type is compatible with
943 VIDIOC_G/S_CTRL. */
944 static bool type_is_int(const struct v4l2_ctrl *ctrl)
945 {
946 switch (ctrl->type) {
947 case V4L2_CTRL_TYPE_INTEGER64:
948 case V4L2_CTRL_TYPE_STRING:
949 /* Nope, these need v4l2_ext_control */
950 return false;
951 default:
952 return true;
953 }
954 }
955
956 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
957 {
958 memset(ev->reserved, 0, sizeof(ev->reserved));
959 ev->type = V4L2_EVENT_CTRL;
960 ev->id = ctrl->id;
961 ev->u.ctrl.changes = changes;
962 ev->u.ctrl.type = ctrl->type;
963 ev->u.ctrl.flags = ctrl->flags;
964 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
965 ev->u.ctrl.value64 = 0;
966 else
967 ev->u.ctrl.value64 = ctrl->cur.val64;
968 ev->u.ctrl.minimum = ctrl->minimum;
969 ev->u.ctrl.maximum = ctrl->maximum;
970 if (ctrl->type == V4L2_CTRL_TYPE_MENU
971 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
972 ev->u.ctrl.step = 1;
973 else
974 ev->u.ctrl.step = ctrl->step;
975 ev->u.ctrl.default_value = ctrl->default_value;
976 }
977
978 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
979 {
980 struct v4l2_event ev;
981 struct v4l2_subscribed_event *sev;
982
983 if (list_empty(&ctrl->ev_subs))
984 return;
985 fill_event(&ev, ctrl, changes);
986
987 list_for_each_entry(sev, &ctrl->ev_subs, node)
988 if (sev->fh != fh ||
989 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
990 v4l2_event_queue_fh(sev->fh, &ev);
991 }
992
993 /* Helper function: copy the current control value back to the caller */
994 static int cur_to_user(struct v4l2_ext_control *c,
995 struct v4l2_ctrl *ctrl)
996 {
997 u32 len;
998
999 switch (ctrl->type) {
1000 case V4L2_CTRL_TYPE_STRING:
1001 len = strlen(ctrl->cur.string);
1002 if (c->size < len + 1) {
1003 c->size = len + 1;
1004 return -ENOSPC;
1005 }
1006 return copy_to_user(c->string, ctrl->cur.string,
1007 len + 1) ? -EFAULT : 0;
1008 case V4L2_CTRL_TYPE_INTEGER64:
1009 c->value64 = ctrl->cur.val64;
1010 break;
1011 default:
1012 c->value = ctrl->cur.val;
1013 break;
1014 }
1015 return 0;
1016 }
1017
1018 /* Helper function: copy the caller-provider value as the new control value */
1019 static int user_to_new(struct v4l2_ext_control *c,
1020 struct v4l2_ctrl *ctrl)
1021 {
1022 int ret;
1023 u32 size;
1024
1025 ctrl->is_new = 1;
1026 switch (ctrl->type) {
1027 case V4L2_CTRL_TYPE_INTEGER64:
1028 ctrl->val64 = c->value64;
1029 break;
1030 case V4L2_CTRL_TYPE_STRING:
1031 size = c->size;
1032 if (size == 0)
1033 return -ERANGE;
1034 if (size > ctrl->maximum + 1)
1035 size = ctrl->maximum + 1;
1036 ret = copy_from_user(ctrl->string, c->string, size);
1037 if (!ret) {
1038 char last = ctrl->string[size - 1];
1039
1040 ctrl->string[size - 1] = 0;
1041 /* If the string was longer than ctrl->maximum,
1042 then return an error. */
1043 if (strlen(ctrl->string) == ctrl->maximum && last)
1044 return -ERANGE;
1045 }
1046 return ret ? -EFAULT : 0;
1047 default:
1048 ctrl->val = c->value;
1049 break;
1050 }
1051 return 0;
1052 }
1053
1054 /* Helper function: copy the new control value back to the caller */
1055 static int new_to_user(struct v4l2_ext_control *c,
1056 struct v4l2_ctrl *ctrl)
1057 {
1058 u32 len;
1059
1060 switch (ctrl->type) {
1061 case V4L2_CTRL_TYPE_STRING:
1062 len = strlen(ctrl->string);
1063 if (c->size < len + 1) {
1064 c->size = ctrl->maximum + 1;
1065 return -ENOSPC;
1066 }
1067 return copy_to_user(c->string, ctrl->string,
1068 len + 1) ? -EFAULT : 0;
1069 case V4L2_CTRL_TYPE_INTEGER64:
1070 c->value64 = ctrl->val64;
1071 break;
1072 default:
1073 c->value = ctrl->val;
1074 break;
1075 }
1076 return 0;
1077 }
1078
1079 /* Copy the new value to the current value. */
1080 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
1081 bool update_inactive)
1082 {
1083 bool changed = false;
1084
1085 if (ctrl == NULL)
1086 return;
1087 switch (ctrl->type) {
1088 case V4L2_CTRL_TYPE_BUTTON:
1089 changed = true;
1090 break;
1091 case V4L2_CTRL_TYPE_STRING:
1092 /* strings are always 0-terminated */
1093 changed = strcmp(ctrl->string, ctrl->cur.string);
1094 strcpy(ctrl->cur.string, ctrl->string);
1095 break;
1096 case V4L2_CTRL_TYPE_INTEGER64:
1097 changed = ctrl->val64 != ctrl->cur.val64;
1098 ctrl->cur.val64 = ctrl->val64;
1099 break;
1100 default:
1101 changed = ctrl->val != ctrl->cur.val;
1102 ctrl->cur.val = ctrl->val;
1103 break;
1104 }
1105 if (update_inactive) {
1106 /* Note: update_inactive can only be true for auto clusters. */
1107 ctrl->flags &=
1108 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1109 if (!is_cur_manual(ctrl->cluster[0])) {
1110 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1111 if (ctrl->cluster[0]->has_volatiles)
1112 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1113 }
1114 fh = NULL;
1115 }
1116 if (changed || update_inactive) {
1117 /* If a control was changed that was not one of the controls
1118 modified by the application, then send the event to all. */
1119 if (!ctrl->is_new)
1120 fh = NULL;
1121 send_event(fh, ctrl,
1122 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
1123 (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
1124 }
1125 }
1126
1127 /* Copy the current value to the new value */
1128 static void cur_to_new(struct v4l2_ctrl *ctrl)
1129 {
1130 if (ctrl == NULL)
1131 return;
1132 switch (ctrl->type) {
1133 case V4L2_CTRL_TYPE_STRING:
1134 /* strings are always 0-terminated */
1135 strcpy(ctrl->string, ctrl->cur.string);
1136 break;
1137 case V4L2_CTRL_TYPE_INTEGER64:
1138 ctrl->val64 = ctrl->cur.val64;
1139 break;
1140 default:
1141 ctrl->val = ctrl->cur.val;
1142 break;
1143 }
1144 }
1145
1146 /* Return non-zero if one or more of the controls in the cluster has a new
1147 value that differs from the current value. */
1148 static int cluster_changed(struct v4l2_ctrl *master)
1149 {
1150 int diff = 0;
1151 int i;
1152
1153 for (i = 0; !diff && i < master->ncontrols; i++) {
1154 struct v4l2_ctrl *ctrl = master->cluster[i];
1155
1156 if (ctrl == NULL)
1157 continue;
1158 switch (ctrl->type) {
1159 case V4L2_CTRL_TYPE_BUTTON:
1160 /* Button controls are always 'different' */
1161 return 1;
1162 case V4L2_CTRL_TYPE_STRING:
1163 /* strings are always 0-terminated */
1164 diff = strcmp(ctrl->string, ctrl->cur.string);
1165 break;
1166 case V4L2_CTRL_TYPE_INTEGER64:
1167 diff = ctrl->val64 != ctrl->cur.val64;
1168 break;
1169 default:
1170 diff = ctrl->val != ctrl->cur.val;
1171 break;
1172 }
1173 }
1174 return diff;
1175 }
1176
1177 /* Validate integer-type control */
1178 static int validate_new_int(const struct v4l2_ctrl *ctrl, s32 *pval)
1179 {
1180 s32 val = *pval;
1181 u32 offset;
1182
1183 switch (ctrl->type) {
1184 case V4L2_CTRL_TYPE_INTEGER:
1185 /* Round towards the closest legal value */
1186 val += ctrl->step / 2;
1187 if (val < ctrl->minimum)
1188 val = ctrl->minimum;
1189 if (val > ctrl->maximum)
1190 val = ctrl->maximum;
1191 offset = val - ctrl->minimum;
1192 offset = ctrl->step * (offset / ctrl->step);
1193 val = ctrl->minimum + offset;
1194 *pval = val;
1195 return 0;
1196
1197 case V4L2_CTRL_TYPE_BOOLEAN:
1198 *pval = !!val;
1199 return 0;
1200
1201 case V4L2_CTRL_TYPE_MENU:
1202 case V4L2_CTRL_TYPE_INTEGER_MENU:
1203 if (val < ctrl->minimum || val > ctrl->maximum)
1204 return -ERANGE;
1205 if (ctrl->menu_skip_mask & (1 << val))
1206 return -EINVAL;
1207 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1208 ctrl->qmenu[val][0] == '\0')
1209 return -EINVAL;
1210 return 0;
1211
1212 case V4L2_CTRL_TYPE_BITMASK:
1213 *pval &= ctrl->maximum;
1214 return 0;
1215
1216 case V4L2_CTRL_TYPE_BUTTON:
1217 case V4L2_CTRL_TYPE_CTRL_CLASS:
1218 *pval = 0;
1219 return 0;
1220
1221 default:
1222 return -EINVAL;
1223 }
1224 }
1225
1226 /* Validate a new control */
1227 static int validate_new(const struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
1228 {
1229 char *s = c->string;
1230 size_t len;
1231
1232 switch (ctrl->type) {
1233 case V4L2_CTRL_TYPE_INTEGER:
1234 case V4L2_CTRL_TYPE_BOOLEAN:
1235 case V4L2_CTRL_TYPE_MENU:
1236 case V4L2_CTRL_TYPE_INTEGER_MENU:
1237 case V4L2_CTRL_TYPE_BITMASK:
1238 case V4L2_CTRL_TYPE_BUTTON:
1239 case V4L2_CTRL_TYPE_CTRL_CLASS:
1240 return validate_new_int(ctrl, &c->value);
1241
1242 case V4L2_CTRL_TYPE_INTEGER64:
1243 return 0;
1244
1245 case V4L2_CTRL_TYPE_STRING:
1246 len = strlen(s);
1247 if (len < ctrl->minimum)
1248 return -ERANGE;
1249 if ((len - ctrl->minimum) % ctrl->step)
1250 return -ERANGE;
1251 return 0;
1252
1253 default:
1254 return -EINVAL;
1255 }
1256 }
1257
1258 static inline u32 node2id(struct list_head *node)
1259 {
1260 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1261 }
1262
1263 /* Set the handler's error code if it wasn't set earlier already */
1264 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1265 {
1266 if (hdl->error == 0)
1267 hdl->error = err;
1268 return err;
1269 }
1270
1271 /* Initialize the handler */
1272 int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
1273 unsigned nr_of_controls_hint)
1274 {
1275 hdl->lock = &hdl->_lock;
1276 mutex_init(hdl->lock);
1277 INIT_LIST_HEAD(&hdl->ctrls);
1278 INIT_LIST_HEAD(&hdl->ctrl_refs);
1279 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1280 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1281 GFP_KERNEL);
1282 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1283 return hdl->error;
1284 }
1285 EXPORT_SYMBOL(v4l2_ctrl_handler_init);
1286
1287 /* Free all controls and control refs */
1288 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1289 {
1290 struct v4l2_ctrl_ref *ref, *next_ref;
1291 struct v4l2_ctrl *ctrl, *next_ctrl;
1292 struct v4l2_subscribed_event *sev, *next_sev;
1293
1294 if (hdl == NULL || hdl->buckets == NULL)
1295 return;
1296
1297 mutex_lock(hdl->lock);
1298 /* Free all nodes */
1299 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1300 list_del(&ref->node);
1301 kfree(ref);
1302 }
1303 /* Free all controls owned by the handler */
1304 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1305 list_del(&ctrl->node);
1306 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1307 list_del(&sev->node);
1308 kfree(ctrl);
1309 }
1310 kfree(hdl->buckets);
1311 hdl->buckets = NULL;
1312 hdl->cached = NULL;
1313 hdl->error = 0;
1314 mutex_unlock(hdl->lock);
1315 }
1316 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1317
1318 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1319 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1320 with applications that do not use the NEXT_CTRL flag.
1321
1322 We just find the n-th private user control. It's O(N), but that should not
1323 be an issue in this particular case. */
1324 static struct v4l2_ctrl_ref *find_private_ref(
1325 struct v4l2_ctrl_handler *hdl, u32 id)
1326 {
1327 struct v4l2_ctrl_ref *ref;
1328
1329 id -= V4L2_CID_PRIVATE_BASE;
1330 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1331 /* Search for private user controls that are compatible with
1332 VIDIOC_G/S_CTRL. */
1333 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1334 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1335 if (!type_is_int(ref->ctrl))
1336 continue;
1337 if (id == 0)
1338 return ref;
1339 id--;
1340 }
1341 }
1342 return NULL;
1343 }
1344
1345 /* Find a control with the given ID. */
1346 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1347 {
1348 struct v4l2_ctrl_ref *ref;
1349 int bucket;
1350
1351 id &= V4L2_CTRL_ID_MASK;
1352
1353 /* Old-style private controls need special handling */
1354 if (id >= V4L2_CID_PRIVATE_BASE)
1355 return find_private_ref(hdl, id);
1356 bucket = id % hdl->nr_of_buckets;
1357
1358 /* Simple optimization: cache the last control found */
1359 if (hdl->cached && hdl->cached->ctrl->id == id)
1360 return hdl->cached;
1361
1362 /* Not in cache, search the hash */
1363 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1364 while (ref && ref->ctrl->id != id)
1365 ref = ref->next;
1366
1367 if (ref)
1368 hdl->cached = ref; /* cache it! */
1369 return ref;
1370 }
1371
1372 /* Find a control with the given ID. Take the handler's lock first. */
1373 static struct v4l2_ctrl_ref *find_ref_lock(
1374 struct v4l2_ctrl_handler *hdl, u32 id)
1375 {
1376 struct v4l2_ctrl_ref *ref = NULL;
1377
1378 if (hdl) {
1379 mutex_lock(hdl->lock);
1380 ref = find_ref(hdl, id);
1381 mutex_unlock(hdl->lock);
1382 }
1383 return ref;
1384 }
1385
1386 /* Find a control with the given ID. */
1387 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1388 {
1389 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1390
1391 return ref ? ref->ctrl : NULL;
1392 }
1393 EXPORT_SYMBOL(v4l2_ctrl_find);
1394
1395 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1396 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1397 struct v4l2_ctrl *ctrl)
1398 {
1399 struct v4l2_ctrl_ref *ref;
1400 struct v4l2_ctrl_ref *new_ref;
1401 u32 id = ctrl->id;
1402 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1403 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1404
1405 /* Automatically add the control class if it is not yet present. */
1406 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1407 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1408 return hdl->error;
1409
1410 if (hdl->error)
1411 return hdl->error;
1412
1413 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1414 if (!new_ref)
1415 return handler_set_err(hdl, -ENOMEM);
1416 new_ref->ctrl = ctrl;
1417 if (ctrl->handler == hdl) {
1418 /* By default each control starts in a cluster of its own.
1419 new_ref->ctrl is basically a cluster array with one
1420 element, so that's perfect to use as the cluster pointer.
1421 But only do this for the handler that owns the control. */
1422 ctrl->cluster = &new_ref->ctrl;
1423 ctrl->ncontrols = 1;
1424 }
1425
1426 INIT_LIST_HEAD(&new_ref->node);
1427
1428 mutex_lock(hdl->lock);
1429
1430 /* Add immediately at the end of the list if the list is empty, or if
1431 the last element in the list has a lower ID.
1432 This ensures that when elements are added in ascending order the
1433 insertion is an O(1) operation. */
1434 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1435 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1436 goto insert_in_hash;
1437 }
1438
1439 /* Find insert position in sorted list */
1440 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1441 if (ref->ctrl->id < id)
1442 continue;
1443 /* Don't add duplicates */
1444 if (ref->ctrl->id == id) {
1445 kfree(new_ref);
1446 goto unlock;
1447 }
1448 list_add(&new_ref->node, ref->node.prev);
1449 break;
1450 }
1451
1452 insert_in_hash:
1453 /* Insert the control node in the hash */
1454 new_ref->next = hdl->buckets[bucket];
1455 hdl->buckets[bucket] = new_ref;
1456
1457 unlock:
1458 mutex_unlock(hdl->lock);
1459 return 0;
1460 }
1461
1462 /* Add a new control */
1463 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1464 const struct v4l2_ctrl_ops *ops,
1465 u32 id, const char *name, enum v4l2_ctrl_type type,
1466 s32 min, s32 max, u32 step, s32 def,
1467 u32 flags, const char * const *qmenu,
1468 const s64 *qmenu_int, void *priv)
1469 {
1470 struct v4l2_ctrl *ctrl;
1471 unsigned sz_extra = 0;
1472
1473 if (hdl->error)
1474 return NULL;
1475
1476 /* Sanity checks */
1477 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1478 (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
1479 (type == V4L2_CTRL_TYPE_BITMASK && max == 0) ||
1480 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1481 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL) ||
1482 (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
1483 handler_set_err(hdl, -ERANGE);
1484 return NULL;
1485 }
1486 if (type != V4L2_CTRL_TYPE_BITMASK && max < min) {
1487 handler_set_err(hdl, -ERANGE);
1488 return NULL;
1489 }
1490 if ((type == V4L2_CTRL_TYPE_INTEGER ||
1491 type == V4L2_CTRL_TYPE_MENU ||
1492 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
1493 type == V4L2_CTRL_TYPE_BOOLEAN) &&
1494 (def < min || def > max)) {
1495 handler_set_err(hdl, -ERANGE);
1496 return NULL;
1497 }
1498 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1499 handler_set_err(hdl, -ERANGE);
1500 return NULL;
1501 }
1502
1503 if (type == V4L2_CTRL_TYPE_BUTTON)
1504 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1505 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1506 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1507 else if (type == V4L2_CTRL_TYPE_STRING)
1508 sz_extra += 2 * (max + 1);
1509
1510 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1511 if (ctrl == NULL) {
1512 handler_set_err(hdl, -ENOMEM);
1513 return NULL;
1514 }
1515
1516 INIT_LIST_HEAD(&ctrl->node);
1517 INIT_LIST_HEAD(&ctrl->ev_subs);
1518 ctrl->handler = hdl;
1519 ctrl->ops = ops;
1520 ctrl->id = id;
1521 ctrl->name = name;
1522 ctrl->type = type;
1523 ctrl->flags = flags;
1524 ctrl->minimum = min;
1525 ctrl->maximum = max;
1526 ctrl->step = step;
1527 if (type == V4L2_CTRL_TYPE_MENU)
1528 ctrl->qmenu = qmenu;
1529 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1530 ctrl->qmenu_int = qmenu_int;
1531 ctrl->priv = priv;
1532 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1533
1534 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1535 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1536 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1537 if (ctrl->minimum)
1538 memset(ctrl->cur.string, ' ', ctrl->minimum);
1539 }
1540 if (handler_new_ref(hdl, ctrl)) {
1541 kfree(ctrl);
1542 return NULL;
1543 }
1544 mutex_lock(hdl->lock);
1545 list_add_tail(&ctrl->node, &hdl->ctrls);
1546 mutex_unlock(hdl->lock);
1547 return ctrl;
1548 }
1549
1550 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1551 const struct v4l2_ctrl_config *cfg, void *priv)
1552 {
1553 bool is_menu;
1554 struct v4l2_ctrl *ctrl;
1555 const char *name = cfg->name;
1556 const char * const *qmenu = cfg->qmenu;
1557 const s64 *qmenu_int = cfg->qmenu_int;
1558 enum v4l2_ctrl_type type = cfg->type;
1559 u32 flags = cfg->flags;
1560 s32 min = cfg->min;
1561 s32 max = cfg->max;
1562 u32 step = cfg->step;
1563 s32 def = cfg->def;
1564
1565 if (name == NULL)
1566 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1567 &def, &flags);
1568
1569 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
1570 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
1571 if (is_menu)
1572 WARN_ON(step);
1573 else
1574 WARN_ON(cfg->menu_skip_mask);
1575 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
1576 qmenu = v4l2_ctrl_get_menu(cfg->id);
1577 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
1578 qmenu_int == NULL) {
1579 handler_set_err(hdl, -EINVAL);
1580 return NULL;
1581 }
1582
1583 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1584 type, min, max,
1585 is_menu ? cfg->menu_skip_mask : step,
1586 def, flags, qmenu, qmenu_int, priv);
1587 if (ctrl)
1588 ctrl->is_private = cfg->is_private;
1589 return ctrl;
1590 }
1591 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1592
1593 /* Helper function for standard non-menu controls */
1594 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1595 const struct v4l2_ctrl_ops *ops,
1596 u32 id, s32 min, s32 max, u32 step, s32 def)
1597 {
1598 const char *name;
1599 enum v4l2_ctrl_type type;
1600 u32 flags;
1601
1602 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1603 if (type == V4L2_CTRL_TYPE_MENU
1604 || type == V4L2_CTRL_TYPE_INTEGER_MENU) {
1605 handler_set_err(hdl, -EINVAL);
1606 return NULL;
1607 }
1608 return v4l2_ctrl_new(hdl, ops, id, name, type,
1609 min, max, step, def, flags, NULL, NULL, NULL);
1610 }
1611 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1612
1613 /* Helper function for standard menu controls */
1614 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1615 const struct v4l2_ctrl_ops *ops,
1616 u32 id, s32 max, s32 mask, s32 def)
1617 {
1618 const char * const *qmenu = v4l2_ctrl_get_menu(id);
1619 const char *name;
1620 enum v4l2_ctrl_type type;
1621 s32 min;
1622 s32 step;
1623 u32 flags;
1624
1625 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1626 if (type != V4L2_CTRL_TYPE_MENU) {
1627 handler_set_err(hdl, -EINVAL);
1628 return NULL;
1629 }
1630 return v4l2_ctrl_new(hdl, ops, id, name, type,
1631 0, max, mask, def, flags, qmenu, NULL, NULL);
1632 }
1633 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1634
1635 /* Helper function for standard integer menu controls */
1636 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
1637 const struct v4l2_ctrl_ops *ops,
1638 u32 id, s32 max, s32 def, const s64 *qmenu_int)
1639 {
1640 const char *name;
1641 enum v4l2_ctrl_type type;
1642 s32 min;
1643 s32 step;
1644 u32 flags;
1645
1646 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1647 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
1648 handler_set_err(hdl, -EINVAL);
1649 return NULL;
1650 }
1651 return v4l2_ctrl_new(hdl, ops, id, name, type,
1652 0, max, 0, def, flags, NULL, qmenu_int, NULL);
1653 }
1654 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
1655
1656 /* Add a control from another handler to this handler */
1657 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1658 struct v4l2_ctrl *ctrl)
1659 {
1660 if (hdl == NULL || hdl->error)
1661 return NULL;
1662 if (ctrl == NULL) {
1663 handler_set_err(hdl, -EINVAL);
1664 return NULL;
1665 }
1666 if (ctrl->handler == hdl)
1667 return ctrl;
1668 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1669 }
1670 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1671
1672 /* Add the controls from another handler to our own. */
1673 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1674 struct v4l2_ctrl_handler *add)
1675 {
1676 struct v4l2_ctrl_ref *ref;
1677 int ret = 0;
1678
1679 /* Do nothing if either handler is NULL or if they are the same */
1680 if (!hdl || !add || hdl == add)
1681 return 0;
1682 if (hdl->error)
1683 return hdl->error;
1684 mutex_lock(add->lock);
1685 list_for_each_entry(ref, &add->ctrl_refs, node) {
1686 struct v4l2_ctrl *ctrl = ref->ctrl;
1687
1688 /* Skip handler-private controls. */
1689 if (ctrl->is_private)
1690 continue;
1691 /* And control classes */
1692 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1693 continue;
1694 ret = handler_new_ref(hdl, ctrl);
1695 if (ret)
1696 break;
1697 }
1698 mutex_unlock(add->lock);
1699 return ret;
1700 }
1701 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1702
1703 /* Cluster controls */
1704 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1705 {
1706 bool has_volatiles = false;
1707 int i;
1708
1709 /* The first control is the master control and it must not be NULL */
1710 BUG_ON(ncontrols == 0 || controls[0] == NULL);
1711
1712 for (i = 0; i < ncontrols; i++) {
1713 if (controls[i]) {
1714 controls[i]->cluster = controls;
1715 controls[i]->ncontrols = ncontrols;
1716 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1717 has_volatiles = true;
1718 }
1719 }
1720 controls[0]->has_volatiles = has_volatiles;
1721 }
1722 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1723
1724 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1725 u8 manual_val, bool set_volatile)
1726 {
1727 struct v4l2_ctrl *master = controls[0];
1728 u32 flag = 0;
1729 int i;
1730
1731 v4l2_ctrl_cluster(ncontrols, controls);
1732 WARN_ON(ncontrols <= 1);
1733 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1734 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1735 master->is_auto = true;
1736 master->has_volatiles = set_volatile;
1737 master->manual_mode_value = manual_val;
1738 master->flags |= V4L2_CTRL_FLAG_UPDATE;
1739
1740 if (!is_cur_manual(master))
1741 flag = V4L2_CTRL_FLAG_INACTIVE |
1742 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1743
1744 for (i = 1; i < ncontrols; i++)
1745 if (controls[i])
1746 controls[i]->flags |= flag;
1747 }
1748 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1749
1750 /* Activate/deactivate a control. */
1751 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1752 {
1753 /* invert since the actual flag is called 'inactive' */
1754 bool inactive = !active;
1755 bool old;
1756
1757 if (ctrl == NULL)
1758 return;
1759
1760 if (inactive)
1761 /* set V4L2_CTRL_FLAG_INACTIVE */
1762 old = test_and_set_bit(4, &ctrl->flags);
1763 else
1764 /* clear V4L2_CTRL_FLAG_INACTIVE */
1765 old = test_and_clear_bit(4, &ctrl->flags);
1766 if (old != inactive)
1767 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1768 }
1769 EXPORT_SYMBOL(v4l2_ctrl_activate);
1770
1771 /* Grab/ungrab a control.
1772 Typically used when streaming starts and you want to grab controls,
1773 preventing the user from changing them.
1774
1775 Just call this and the framework will block any attempts to change
1776 these controls. */
1777 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1778 {
1779 bool old;
1780
1781 if (ctrl == NULL)
1782 return;
1783
1784 v4l2_ctrl_lock(ctrl);
1785 if (grabbed)
1786 /* set V4L2_CTRL_FLAG_GRABBED */
1787 old = test_and_set_bit(1, &ctrl->flags);
1788 else
1789 /* clear V4L2_CTRL_FLAG_GRABBED */
1790 old = test_and_clear_bit(1, &ctrl->flags);
1791 if (old != grabbed)
1792 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1793 v4l2_ctrl_unlock(ctrl);
1794 }
1795 EXPORT_SYMBOL(v4l2_ctrl_grab);
1796
1797 /* Log the control name and value */
1798 static void log_ctrl(const struct v4l2_ctrl *ctrl,
1799 const char *prefix, const char *colon)
1800 {
1801 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1802 return;
1803 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1804 return;
1805
1806 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1807
1808 switch (ctrl->type) {
1809 case V4L2_CTRL_TYPE_INTEGER:
1810 printk(KERN_CONT "%d", ctrl->cur.val);
1811 break;
1812 case V4L2_CTRL_TYPE_BOOLEAN:
1813 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1814 break;
1815 case V4L2_CTRL_TYPE_MENU:
1816 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1817 break;
1818 case V4L2_CTRL_TYPE_INTEGER_MENU:
1819 printk(KERN_CONT "%lld", ctrl->qmenu_int[ctrl->cur.val]);
1820 break;
1821 case V4L2_CTRL_TYPE_BITMASK:
1822 printk(KERN_CONT "0x%08x", ctrl->cur.val);
1823 break;
1824 case V4L2_CTRL_TYPE_INTEGER64:
1825 printk(KERN_CONT "%lld", ctrl->cur.val64);
1826 break;
1827 case V4L2_CTRL_TYPE_STRING:
1828 printk(KERN_CONT "%s", ctrl->cur.string);
1829 break;
1830 default:
1831 printk(KERN_CONT "unknown type %d", ctrl->type);
1832 break;
1833 }
1834 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
1835 V4L2_CTRL_FLAG_GRABBED |
1836 V4L2_CTRL_FLAG_VOLATILE)) {
1837 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
1838 printk(KERN_CONT " inactive");
1839 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
1840 printk(KERN_CONT " grabbed");
1841 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
1842 printk(KERN_CONT " volatile");
1843 }
1844 printk(KERN_CONT "\n");
1845 }
1846
1847 /* Log all controls owned by the handler */
1848 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1849 const char *prefix)
1850 {
1851 struct v4l2_ctrl *ctrl;
1852 const char *colon = "";
1853 int len;
1854
1855 if (hdl == NULL)
1856 return;
1857 if (prefix == NULL)
1858 prefix = "";
1859 len = strlen(prefix);
1860 if (len && prefix[len - 1] != ' ')
1861 colon = ": ";
1862 mutex_lock(hdl->lock);
1863 list_for_each_entry(ctrl, &hdl->ctrls, node)
1864 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1865 log_ctrl(ctrl, prefix, colon);
1866 mutex_unlock(hdl->lock);
1867 }
1868 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1869
1870 /* Call s_ctrl for all controls owned by the handler */
1871 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1872 {
1873 struct v4l2_ctrl *ctrl;
1874 int ret = 0;
1875
1876 if (hdl == NULL)
1877 return 0;
1878 mutex_lock(hdl->lock);
1879 list_for_each_entry(ctrl, &hdl->ctrls, node)
1880 ctrl->done = false;
1881
1882 list_for_each_entry(ctrl, &hdl->ctrls, node) {
1883 struct v4l2_ctrl *master = ctrl->cluster[0];
1884 int i;
1885
1886 /* Skip if this control was already handled by a cluster. */
1887 /* Skip button controls and read-only controls. */
1888 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1889 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
1890 continue;
1891
1892 for (i = 0; i < master->ncontrols; i++) {
1893 if (master->cluster[i]) {
1894 cur_to_new(master->cluster[i]);
1895 master->cluster[i]->is_new = 1;
1896 master->cluster[i]->done = true;
1897 }
1898 }
1899 ret = call_op(master, s_ctrl);
1900 if (ret)
1901 break;
1902 }
1903 mutex_unlock(hdl->lock);
1904 return ret;
1905 }
1906 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1907
1908 /* Implement VIDIOC_QUERYCTRL */
1909 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1910 {
1911 u32 id = qc->id & V4L2_CTRL_ID_MASK;
1912 struct v4l2_ctrl_ref *ref;
1913 struct v4l2_ctrl *ctrl;
1914
1915 if (hdl == NULL)
1916 return -EINVAL;
1917
1918 mutex_lock(hdl->lock);
1919
1920 /* Try to find it */
1921 ref = find_ref(hdl, id);
1922
1923 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1924 /* Find the next control with ID > qc->id */
1925
1926 /* Did we reach the end of the control list? */
1927 if (id >= node2id(hdl->ctrl_refs.prev)) {
1928 ref = NULL; /* Yes, so there is no next control */
1929 } else if (ref) {
1930 /* We found a control with the given ID, so just get
1931 the next one in the list. */
1932 ref = list_entry(ref->node.next, typeof(*ref), node);
1933 } else {
1934 /* No control with the given ID exists, so start
1935 searching for the next largest ID. We know there
1936 is one, otherwise the first 'if' above would have
1937 been true. */
1938 list_for_each_entry(ref, &hdl->ctrl_refs, node)
1939 if (id < ref->ctrl->id)
1940 break;
1941 }
1942 }
1943 mutex_unlock(hdl->lock);
1944 if (!ref)
1945 return -EINVAL;
1946
1947 ctrl = ref->ctrl;
1948 memset(qc, 0, sizeof(*qc));
1949 if (id >= V4L2_CID_PRIVATE_BASE)
1950 qc->id = id;
1951 else
1952 qc->id = ctrl->id;
1953 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1954 qc->minimum = ctrl->minimum;
1955 qc->maximum = ctrl->maximum;
1956 qc->default_value = ctrl->default_value;
1957 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1958 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1959 qc->step = 1;
1960 else
1961 qc->step = ctrl->step;
1962 qc->flags = ctrl->flags;
1963 qc->type = ctrl->type;
1964 return 0;
1965 }
1966 EXPORT_SYMBOL(v4l2_queryctrl);
1967
1968 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1969 {
1970 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
1971 return -EINVAL;
1972 return v4l2_queryctrl(sd->ctrl_handler, qc);
1973 }
1974 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1975
1976 /* Implement VIDIOC_QUERYMENU */
1977 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1978 {
1979 struct v4l2_ctrl *ctrl;
1980 u32 i = qm->index;
1981
1982 ctrl = v4l2_ctrl_find(hdl, qm->id);
1983 if (!ctrl)
1984 return -EINVAL;
1985
1986 qm->reserved = 0;
1987 /* Sanity checks */
1988 switch (ctrl->type) {
1989 case V4L2_CTRL_TYPE_MENU:
1990 if (ctrl->qmenu == NULL)
1991 return -EINVAL;
1992 break;
1993 case V4L2_CTRL_TYPE_INTEGER_MENU:
1994 if (ctrl->qmenu_int == NULL)
1995 return -EINVAL;
1996 break;
1997 default:
1998 return -EINVAL;
1999 }
2000
2001 if (i < ctrl->minimum || i > ctrl->maximum)
2002 return -EINVAL;
2003
2004 /* Use mask to see if this menu item should be skipped */
2005 if (ctrl->menu_skip_mask & (1 << i))
2006 return -EINVAL;
2007 /* Empty menu items should also be skipped */
2008 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2009 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2010 return -EINVAL;
2011 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2012 } else {
2013 qm->value = ctrl->qmenu_int[i];
2014 }
2015 return 0;
2016 }
2017 EXPORT_SYMBOL(v4l2_querymenu);
2018
2019 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2020 {
2021 return v4l2_querymenu(sd->ctrl_handler, qm);
2022 }
2023 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2024
2025
2026
2027 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2028
2029 It is not a fully atomic operation, just best-effort only. After all, if
2030 multiple controls have to be set through multiple i2c writes (for example)
2031 then some initial writes may succeed while others fail. Thus leaving the
2032 system in an inconsistent state. The question is how much effort you are
2033 willing to spend on trying to make something atomic that really isn't.
2034
2035 From the point of view of an application the main requirement is that
2036 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2037 error should be returned without actually affecting any controls.
2038
2039 If all the values are correct, then it is acceptable to just give up
2040 in case of low-level errors.
2041
2042 It is important though that the application can tell when only a partial
2043 configuration was done. The way we do that is through the error_idx field
2044 of struct v4l2_ext_controls: if that is equal to the count field then no
2045 controls were affected. Otherwise all controls before that index were
2046 successful in performing their 'get' or 'set' operation, the control at
2047 the given index failed, and you don't know what happened with the controls
2048 after the failed one. Since if they were part of a control cluster they
2049 could have been successfully processed (if a cluster member was encountered
2050 at index < error_idx), they could have failed (if a cluster member was at
2051 error_idx), or they may not have been processed yet (if the first cluster
2052 member appeared after error_idx).
2053
2054 It is all fairly theoretical, though. In practice all you can do is to
2055 bail out. If error_idx == count, then it is an application bug. If
2056 error_idx < count then it is only an application bug if the error code was
2057 EBUSY. That usually means that something started streaming just when you
2058 tried to set the controls. In all other cases it is a driver/hardware
2059 problem and all you can do is to retry or bail out.
2060
2061 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2062 never modifies controls the error_idx is just set to whatever control
2063 has an invalid value.
2064 */
2065
2066 /* Prepare for the extended g/s/try functions.
2067 Find the controls in the control array and do some basic checks. */
2068 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2069 struct v4l2_ext_controls *cs,
2070 struct v4l2_ctrl_helper *helpers)
2071 {
2072 struct v4l2_ctrl_helper *h;
2073 bool have_clusters = false;
2074 u32 i;
2075
2076 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2077 struct v4l2_ext_control *c = &cs->controls[i];
2078 struct v4l2_ctrl_ref *ref;
2079 struct v4l2_ctrl *ctrl;
2080 u32 id = c->id & V4L2_CTRL_ID_MASK;
2081
2082 cs->error_idx = i;
2083
2084 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2085 return -EINVAL;
2086
2087 /* Old-style private controls are not allowed for
2088 extended controls */
2089 if (id >= V4L2_CID_PRIVATE_BASE)
2090 return -EINVAL;
2091 ref = find_ref_lock(hdl, id);
2092 if (ref == NULL)
2093 return -EINVAL;
2094 ctrl = ref->ctrl;
2095 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2096 return -EINVAL;
2097
2098 if (ctrl->cluster[0]->ncontrols > 1)
2099 have_clusters = true;
2100 if (ctrl->cluster[0] != ctrl)
2101 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2102 /* Store the ref to the master control of the cluster */
2103 h->mref = ref;
2104 h->ctrl = ctrl;
2105 /* Initially set next to 0, meaning that there is no other
2106 control in this helper array belonging to the same
2107 cluster */
2108 h->next = 0;
2109 }
2110
2111 /* We are done if there were no controls that belong to a multi-
2112 control cluster. */
2113 if (!have_clusters)
2114 return 0;
2115
2116 /* The code below figures out in O(n) time which controls in the list
2117 belong to the same cluster. */
2118
2119 /* This has to be done with the handler lock taken. */
2120 mutex_lock(hdl->lock);
2121
2122 /* First zero the helper field in the master control references */
2123 for (i = 0; i < cs->count; i++)
2124 helpers[i].mref->helper = 0;
2125 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2126 struct v4l2_ctrl_ref *mref = h->mref;
2127
2128 /* If the mref->helper is set, then it points to an earlier
2129 helper that belongs to the same cluster. */
2130 if (mref->helper) {
2131 /* Set the next field of mref->helper to the current
2132 index: this means that that earlier helper now
2133 points to the next helper in the same cluster. */
2134 mref->helper->next = i;
2135 /* mref should be set only for the first helper in the
2136 cluster, clear the others. */
2137 h->mref = NULL;
2138 }
2139 /* Point the mref helper to the current helper struct. */
2140 mref->helper = h;
2141 }
2142 mutex_unlock(hdl->lock);
2143 return 0;
2144 }
2145
2146 /* Handles the corner case where cs->count == 0. It checks whether the
2147 specified control class exists. If that class ID is 0, then it checks
2148 whether there are any controls at all. */
2149 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2150 {
2151 if (ctrl_class == 0)
2152 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2153 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2154 }
2155
2156
2157
2158 /* Get extended controls. Allocates the helpers array if needed. */
2159 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2160 {
2161 struct v4l2_ctrl_helper helper[4];
2162 struct v4l2_ctrl_helper *helpers = helper;
2163 int ret;
2164 int i, j;
2165
2166 cs->error_idx = cs->count;
2167 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2168
2169 if (hdl == NULL)
2170 return -EINVAL;
2171
2172 if (cs->count == 0)
2173 return class_check(hdl, cs->ctrl_class);
2174
2175 if (cs->count > ARRAY_SIZE(helper)) {
2176 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2177 GFP_KERNEL);
2178 if (helpers == NULL)
2179 return -ENOMEM;
2180 }
2181
2182 ret = prepare_ext_ctrls(hdl, cs, helpers);
2183 cs->error_idx = cs->count;
2184
2185 for (i = 0; !ret && i < cs->count; i++)
2186 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2187 ret = -EACCES;
2188
2189 for (i = 0; !ret && i < cs->count; i++) {
2190 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2191 struct v4l2_ctrl *ctrl) = cur_to_user;
2192 struct v4l2_ctrl *master;
2193
2194 if (helpers[i].mref == NULL)
2195 continue;
2196
2197 master = helpers[i].mref->ctrl;
2198 cs->error_idx = i;
2199
2200 v4l2_ctrl_lock(master);
2201
2202 /* g_volatile_ctrl will update the new control values */
2203 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2204 (master->has_volatiles && !is_cur_manual(master))) {
2205 for (j = 0; j < master->ncontrols; j++)
2206 cur_to_new(master->cluster[j]);
2207 ret = call_op(master, g_volatile_ctrl);
2208 ctrl_to_user = new_to_user;
2209 }
2210 /* If OK, then copy the current (for non-volatile controls)
2211 or the new (for volatile controls) control values to the
2212 caller */
2213 if (!ret) {
2214 u32 idx = i;
2215
2216 do {
2217 ret = ctrl_to_user(cs->controls + idx,
2218 helpers[idx].ctrl);
2219 idx = helpers[idx].next;
2220 } while (!ret && idx);
2221 }
2222 v4l2_ctrl_unlock(master);
2223 }
2224
2225 if (cs->count > ARRAY_SIZE(helper))
2226 kfree(helpers);
2227 return ret;
2228 }
2229 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2230
2231 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2232 {
2233 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2234 }
2235 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2236
2237 /* Helper function to get a single control */
2238 static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
2239 {
2240 struct v4l2_ctrl *master = ctrl->cluster[0];
2241 int ret = 0;
2242 int i;
2243
2244 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2245 return -EACCES;
2246
2247 v4l2_ctrl_lock(master);
2248 /* g_volatile_ctrl will update the current control values */
2249 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2250 for (i = 0; i < master->ncontrols; i++)
2251 cur_to_new(master->cluster[i]);
2252 ret = call_op(master, g_volatile_ctrl);
2253 *val = ctrl->val;
2254 } else {
2255 *val = ctrl->cur.val;
2256 }
2257 v4l2_ctrl_unlock(master);
2258 return ret;
2259 }
2260
2261 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2262 {
2263 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2264
2265 if (ctrl == NULL || !type_is_int(ctrl))
2266 return -EINVAL;
2267 return get_ctrl(ctrl, &control->value);
2268 }
2269 EXPORT_SYMBOL(v4l2_g_ctrl);
2270
2271 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2272 {
2273 return v4l2_g_ctrl(sd->ctrl_handler, control);
2274 }
2275 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2276
2277 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2278 {
2279 s32 val = 0;
2280
2281 /* It's a driver bug if this happens. */
2282 WARN_ON(!type_is_int(ctrl));
2283 get_ctrl(ctrl, &val);
2284 return val;
2285 }
2286 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2287
2288
2289 /* Core function that calls try/s_ctrl and ensures that the new value is
2290 copied to the current value on a set.
2291 Must be called with ctrl->handler->lock held. */
2292 static int try_or_set_cluster(struct v4l2_fh *fh,
2293 struct v4l2_ctrl *master, bool set)
2294 {
2295 bool update_flag;
2296 int ret;
2297 int i;
2298
2299 /* Go through the cluster and either validate the new value or
2300 (if no new value was set), copy the current value to the new
2301 value, ensuring a consistent view for the control ops when
2302 called. */
2303 for (i = 0; i < master->ncontrols; i++) {
2304 struct v4l2_ctrl *ctrl = master->cluster[i];
2305
2306 if (ctrl == NULL)
2307 continue;
2308
2309 if (!ctrl->is_new) {
2310 cur_to_new(ctrl);
2311 continue;
2312 }
2313 /* Check again: it may have changed since the
2314 previous check in try_or_set_ext_ctrls(). */
2315 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2316 return -EBUSY;
2317 }
2318
2319 ret = call_op(master, try_ctrl);
2320
2321 /* Don't set if there is no change */
2322 if (ret || !set || !cluster_changed(master))
2323 return ret;
2324 ret = call_op(master, s_ctrl);
2325 if (ret)
2326 return ret;
2327
2328 /* If OK, then make the new values permanent. */
2329 update_flag = is_cur_manual(master) != is_new_manual(master);
2330 for (i = 0; i < master->ncontrols; i++)
2331 new_to_cur(fh, master->cluster[i], update_flag && i > 0);
2332 return 0;
2333 }
2334
2335 /* Validate controls. */
2336 static int validate_ctrls(struct v4l2_ext_controls *cs,
2337 struct v4l2_ctrl_helper *helpers, bool set)
2338 {
2339 unsigned i;
2340 int ret = 0;
2341
2342 cs->error_idx = cs->count;
2343 for (i = 0; i < cs->count; i++) {
2344 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2345
2346 cs->error_idx = i;
2347
2348 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2349 return -EACCES;
2350 /* This test is also done in try_set_control_cluster() which
2351 is called in atomic context, so that has the final say,
2352 but it makes sense to do an up-front check as well. Once
2353 an error occurs in try_set_control_cluster() some other
2354 controls may have been set already and we want to do a
2355 best-effort to avoid that. */
2356 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2357 return -EBUSY;
2358 ret = validate_new(ctrl, &cs->controls[i]);
2359 if (ret)
2360 return ret;
2361 }
2362 return 0;
2363 }
2364
2365 /* Obtain the current volatile values of an autocluster and mark them
2366 as new. */
2367 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2368 {
2369 int i;
2370
2371 for (i = 0; i < master->ncontrols; i++)
2372 cur_to_new(master->cluster[i]);
2373 if (!call_op(master, g_volatile_ctrl))
2374 for (i = 1; i < master->ncontrols; i++)
2375 if (master->cluster[i])
2376 master->cluster[i]->is_new = 1;
2377 }
2378
2379 /* Try or try-and-set controls */
2380 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2381 struct v4l2_ext_controls *cs,
2382 bool set)
2383 {
2384 struct v4l2_ctrl_helper helper[4];
2385 struct v4l2_ctrl_helper *helpers = helper;
2386 unsigned i, j;
2387 int ret;
2388
2389 cs->error_idx = cs->count;
2390 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2391
2392 if (hdl == NULL)
2393 return -EINVAL;
2394
2395 if (cs->count == 0)
2396 return class_check(hdl, cs->ctrl_class);
2397
2398 if (cs->count > ARRAY_SIZE(helper)) {
2399 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2400 GFP_KERNEL);
2401 if (!helpers)
2402 return -ENOMEM;
2403 }
2404 ret = prepare_ext_ctrls(hdl, cs, helpers);
2405 if (!ret)
2406 ret = validate_ctrls(cs, helpers, set);
2407 if (ret && set)
2408 cs->error_idx = cs->count;
2409 for (i = 0; !ret && i < cs->count; i++) {
2410 struct v4l2_ctrl *master;
2411 u32 idx = i;
2412
2413 if (helpers[i].mref == NULL)
2414 continue;
2415
2416 cs->error_idx = i;
2417 master = helpers[i].mref->ctrl;
2418 v4l2_ctrl_lock(master);
2419
2420 /* Reset the 'is_new' flags of the cluster */
2421 for (j = 0; j < master->ncontrols; j++)
2422 if (master->cluster[j])
2423 master->cluster[j]->is_new = 0;
2424
2425 /* For volatile autoclusters that are currently in auto mode
2426 we need to discover if it will be set to manual mode.
2427 If so, then we have to copy the current volatile values
2428 first since those will become the new manual values (which
2429 may be overwritten by explicit new values from this set
2430 of controls). */
2431 if (master->is_auto && master->has_volatiles &&
2432 !is_cur_manual(master)) {
2433 /* Pick an initial non-manual value */
2434 s32 new_auto_val = master->manual_mode_value + 1;
2435 u32 tmp_idx = idx;
2436
2437 do {
2438 /* Check if the auto control is part of the
2439 list, and remember the new value. */
2440 if (helpers[tmp_idx].ctrl == master)
2441 new_auto_val = cs->controls[tmp_idx].value;
2442 tmp_idx = helpers[tmp_idx].next;
2443 } while (tmp_idx);
2444 /* If the new value == the manual value, then copy
2445 the current volatile values. */
2446 if (new_auto_val == master->manual_mode_value)
2447 update_from_auto_cluster(master);
2448 }
2449
2450 /* Copy the new caller-supplied control values.
2451 user_to_new() sets 'is_new' to 1. */
2452 do {
2453 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2454 idx = helpers[idx].next;
2455 } while (!ret && idx);
2456
2457 if (!ret)
2458 ret = try_or_set_cluster(fh, master, set);
2459
2460 /* Copy the new values back to userspace. */
2461 if (!ret) {
2462 idx = i;
2463 do {
2464 ret = new_to_user(cs->controls + idx,
2465 helpers[idx].ctrl);
2466 idx = helpers[idx].next;
2467 } while (!ret && idx);
2468 }
2469 v4l2_ctrl_unlock(master);
2470 }
2471
2472 if (cs->count > ARRAY_SIZE(helper))
2473 kfree(helpers);
2474 return ret;
2475 }
2476
2477 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2478 {
2479 return try_set_ext_ctrls(NULL, hdl, cs, false);
2480 }
2481 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2482
2483 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2484 struct v4l2_ext_controls *cs)
2485 {
2486 return try_set_ext_ctrls(fh, hdl, cs, true);
2487 }
2488 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2489
2490 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2491 {
2492 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2493 }
2494 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2495
2496 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2497 {
2498 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2499 }
2500 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2501
2502 /* Helper function for VIDIOC_S_CTRL compatibility */
2503 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val)
2504 {
2505 struct v4l2_ctrl *master = ctrl->cluster[0];
2506 int ret;
2507 int i;
2508
2509 ret = validate_new_int(ctrl, val);
2510 if (ret)
2511 return ret;
2512
2513 v4l2_ctrl_lock(ctrl);
2514
2515 /* Reset the 'is_new' flags of the cluster */
2516 for (i = 0; i < master->ncontrols; i++)
2517 if (master->cluster[i])
2518 master->cluster[i]->is_new = 0;
2519
2520 /* For autoclusters with volatiles that are switched from auto to
2521 manual mode we have to update the current volatile values since
2522 those will become the initial manual values after such a switch. */
2523 if (master->is_auto && master->has_volatiles && ctrl == master &&
2524 !is_cur_manual(master) && *val == master->manual_mode_value)
2525 update_from_auto_cluster(master);
2526 ctrl->val = *val;
2527 ctrl->is_new = 1;
2528 ret = try_or_set_cluster(fh, master, true);
2529 *val = ctrl->cur.val;
2530 v4l2_ctrl_unlock(ctrl);
2531 return ret;
2532 }
2533
2534 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2535 struct v4l2_control *control)
2536 {
2537 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2538
2539 if (ctrl == NULL || !type_is_int(ctrl))
2540 return -EINVAL;
2541
2542 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2543 return -EACCES;
2544
2545 return set_ctrl(fh, ctrl, &control->value);
2546 }
2547 EXPORT_SYMBOL(v4l2_s_ctrl);
2548
2549 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2550 {
2551 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2552 }
2553 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2554
2555 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2556 {
2557 /* It's a driver bug if this happens. */
2558 WARN_ON(!type_is_int(ctrl));
2559 return set_ctrl(NULL, ctrl, &val);
2560 }
2561 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2562
2563 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
2564 {
2565 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2566
2567 if (ctrl == NULL)
2568 return -EINVAL;
2569
2570 v4l2_ctrl_lock(ctrl);
2571 list_add_tail(&sev->node, &ctrl->ev_subs);
2572 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2573 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2574 struct v4l2_event ev;
2575 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2576
2577 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2578 changes |= V4L2_EVENT_CTRL_CH_VALUE;
2579 fill_event(&ev, ctrl, changes);
2580 /* Mark the queue as active, allowing this initial
2581 event to be accepted. */
2582 sev->elems = elems;
2583 v4l2_event_queue_fh(sev->fh, &ev);
2584 }
2585 v4l2_ctrl_unlock(ctrl);
2586 return 0;
2587 }
2588
2589 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
2590 {
2591 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2592
2593 v4l2_ctrl_lock(ctrl);
2594 list_del(&sev->node);
2595 v4l2_ctrl_unlock(ctrl);
2596 }
2597
2598 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
2599 {
2600 u32 old_changes = old->u.ctrl.changes;
2601
2602 old->u.ctrl = new->u.ctrl;
2603 old->u.ctrl.changes |= old_changes;
2604 }
2605 EXPORT_SYMBOL(v4l2_ctrl_replace);
2606
2607 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
2608 {
2609 new->u.ctrl.changes |= old->u.ctrl.changes;
2610 }
2611 EXPORT_SYMBOL(v4l2_ctrl_merge);
2612
2613 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
2614 .add = v4l2_ctrl_add_event,
2615 .del = v4l2_ctrl_del_event,
2616 .replace = v4l2_ctrl_replace,
2617 .merge = v4l2_ctrl_merge,
2618 };
2619 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
2620
2621 int v4l2_ctrl_log_status(struct file *file, void *fh)
2622 {
2623 struct video_device *vfd = video_devdata(file);
2624 struct v4l2_fh *vfh = file->private_data;
2625
2626 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
2627 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
2628 vfd->v4l2_dev->name);
2629 return 0;
2630 }
2631 EXPORT_SYMBOL(v4l2_ctrl_log_status);
2632
2633 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
2634 struct v4l2_event_subscription *sub)
2635 {
2636 if (sub->type == V4L2_EVENT_CTRL)
2637 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
2638 return -EINVAL;
2639 }
2640 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
2641
2642 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
2643 {
2644 struct v4l2_fh *fh = file->private_data;
2645
2646 if (v4l2_event_pending(fh))
2647 return POLLPRI;
2648 poll_wait(file, &fh->wait, wait);
2649 return 0;
2650 }
2651 EXPORT_SYMBOL(v4l2_ctrl_poll);
kernel source for telekom puls (alcatel/mediatek)