?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / media / v4l2-core / v4l2-ctrls.c
blob6ff002bd5909045e97ed56d51ecb3813877583cb
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 "Matrix",
238 NULL
239 };
240 static const char * const camera_auto_focus_range[] = {
241 "Auto",
242 "Normal",
243 "Macro",
244 "Infinity",
245 NULL
246 };
247 static const char * const colorfx[] = {
248 "None",
249 "Black & White",
250 "Sepia",
251 "Negative",
252 "Emboss",
253 "Sketch",
254 "Sky Blue",
255 "Grass Green",
256 "Skin Whiten",
257 "Vivid",
258 "Aqua",
259 "Art Freeze",
260 "Silhouette",
261 "Solarization",
262 "Antique",
263 "Set Cb/Cr",
264 NULL
265 };
266 static const char * const auto_n_preset_white_balance[] = {
267 "Manual",
268 "Auto",
269 "Incandescent",
270 "Fluorescent",
271 "Fluorescent H",
272 "Horizon",
273 "Daylight",
274 "Flash",
275 "Cloudy",
276 "Shade",
277 NULL,
278 };
279 static const char * const camera_iso_sensitivity_auto[] = {
280 "Manual",
281 "Auto",
282 NULL
283 };
284 static const char * const scene_mode[] = {
285 "None",
286 "Backlight",
287 "Beach/Snow",
288 "Candle Light",
289 "Dusk/Dawn",
290 "Fall Colors",
291 "Fireworks",
292 "Landscape",
293 "Night",
294 "Party/Indoor",
295 "Portrait",
296 "Sports",
297 "Sunset",
298 "Text",
299 NULL
300 };
301 static const char * const tune_emphasis[] = {
302 "None",
303 "50 Microseconds",
304 "75 Microseconds",
305 NULL,
306 };
307 static const char * const header_mode[] = {
308 "Separate Buffer",
309 "Joined With 1st Frame",
310 NULL,
311 };
312 static const char * const multi_slice[] = {
313 "Single",
314 "Max Macroblocks",
315 "Max Bytes",
316 NULL,
317 };
318 static const char * const entropy_mode[] = {
319 "CAVLC",
320 "CABAC",
321 NULL,
322 };
323 static const char * const mpeg_h264_level[] = {
324 "1",
325 "1b",
326 "1.1",
327 "1.2",
328 "1.3",
329 "2",
330 "2.1",
331 "2.2",
332 "3",
333 "3.1",
334 "3.2",
335 "4",
336 "4.1",
337 "4.2",
338 "5",
339 "5.1",
340 NULL,
341 };
342 static const char * const h264_loop_filter[] = {
343 "Enabled",
344 "Disabled",
345 "Disabled at Slice Boundary",
346 NULL,
347 };
348 static const char * const h264_profile[] = {
349 "Baseline",
350 "Constrained Baseline",
351 "Main",
352 "Extended",
353 "High",
354 "High 10",
355 "High 422",
356 "High 444 Predictive",
357 "High 10 Intra",
358 "High 422 Intra",
359 "High 444 Intra",
360 "CAVLC 444 Intra",
361 "Scalable Baseline",
362 "Scalable High",
363 "Scalable High Intra",
364 "Multiview High",
365 NULL,
366 };
367 static const char * const vui_sar_idc[] = {
368 "Unspecified",
369 "1:1",
370 "12:11",
371 "10:11",
372 "16:11",
373 "40:33",
374 "24:11",
375 "20:11",
376 "32:11",
377 "80:33",
378 "18:11",
379 "15:11",
380 "64:33",
381 "160:99",
382 "4:3",
383 "3:2",
384 "2:1",
385 "Extended SAR",
386 NULL,
387 };
388 static const char * const h264_fp_arrangement_type[] = {
389 "Checkerboard",
390 "Column",
391 "Row",
392 "Side by Side",
393 "Top Bottom",
394 "Temporal",
395 NULL,
396 };
397 static const char * const h264_fmo_map_type[] = {
398 "Interleaved Slices",
399 "Scattered Slices",
400 "Foreground with Leftover",
401 "Box Out",
402 "Raster Scan",
403 "Wipe Scan",
404 "Explicit",
405 NULL,
406 };
407 static const char * const mpeg_mpeg4_level[] = {
408 "0",
409 "0b",
410 "1",
411 "2",
412 "3",
413 "3b",
414 "4",
415 "5",
416 NULL,
417 };
418 static const char * const mpeg4_profile[] = {
419 "Simple",
420 "Advanced Simple",
421 "Core",
422 "Simple Scalable",
423 "Advanced Coding Efficiency",
424 NULL,
425 };
426
427 static const char * const vpx_golden_frame_sel[] = {
428 "Use Previous Frame",
429 "Use Previous Specific Frame",
430 NULL,
431 };
432
433 static const char * const flash_led_mode[] = {
434 "Off",
435 "Flash",
436 "Torch",
437 NULL,
438 };
439 static const char * const flash_strobe_source[] = {
440 "Software",
441 "External",
442 NULL,
443 };
444
445 static const char * const jpeg_chroma_subsampling[] = {
446 "4:4:4",
447 "4:2:2",
448 "4:2:0",
449 "4:1:1",
450 "4:1:0",
451 "Gray",
452 NULL,
453 };
454 static const char * const dv_tx_mode[] = {
455 "DVI-D",
456 "HDMI",
457 NULL,
458 };
459 static const char * const dv_rgb_range[] = {
460 "Automatic",
461 "RGB limited range (16-235)",
462 "RGB full range (0-255)",
463 NULL,
464 };
465
466
467 switch (id) {
468 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
469 return mpeg_audio_sampling_freq;
470 case V4L2_CID_MPEG_AUDIO_ENCODING:
471 return mpeg_audio_encoding;
472 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
473 return mpeg_audio_l1_bitrate;
474 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
475 return mpeg_audio_l2_bitrate;
476 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
477 return mpeg_audio_l3_bitrate;
478 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
479 return mpeg_audio_ac3_bitrate;
480 case V4L2_CID_MPEG_AUDIO_MODE:
481 return mpeg_audio_mode;
482 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
483 return mpeg_audio_mode_extension;
484 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
485 return mpeg_audio_emphasis;
486 case V4L2_CID_MPEG_AUDIO_CRC:
487 return mpeg_audio_crc;
488 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
489 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
490 return mpeg_audio_dec_playback;
491 case V4L2_CID_MPEG_VIDEO_ENCODING:
492 return mpeg_video_encoding;
493 case V4L2_CID_MPEG_VIDEO_ASPECT:
494 return mpeg_video_aspect;
495 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
496 return mpeg_video_bitrate_mode;
497 case V4L2_CID_MPEG_STREAM_TYPE:
498 return mpeg_stream_type;
499 case V4L2_CID_MPEG_STREAM_VBI_FMT:
500 return mpeg_stream_vbi_fmt;
501 case V4L2_CID_POWER_LINE_FREQUENCY:
502 return camera_power_line_frequency;
503 case V4L2_CID_EXPOSURE_AUTO:
504 return camera_exposure_auto;
505 case V4L2_CID_EXPOSURE_METERING:
506 return camera_exposure_metering;
507 case V4L2_CID_AUTO_FOCUS_RANGE:
508 return camera_auto_focus_range;
509 case V4L2_CID_COLORFX:
510 return colorfx;
511 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
512 return auto_n_preset_white_balance;
513 case V4L2_CID_ISO_SENSITIVITY_AUTO:
514 return camera_iso_sensitivity_auto;
515 case V4L2_CID_SCENE_MODE:
516 return scene_mode;
517 case V4L2_CID_TUNE_PREEMPHASIS:
518 return tune_emphasis;
519 case V4L2_CID_TUNE_DEEMPHASIS:
520 return tune_emphasis;
521 case V4L2_CID_FLASH_LED_MODE:
522 return flash_led_mode;
523 case V4L2_CID_FLASH_STROBE_SOURCE:
524 return flash_strobe_source;
525 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
526 return header_mode;
527 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
528 return multi_slice;
529 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
530 return entropy_mode;
531 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
532 return mpeg_h264_level;
533 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
534 return h264_loop_filter;
535 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
536 return h264_profile;
537 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
538 return vui_sar_idc;
539 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
540 return h264_fp_arrangement_type;
541 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
542 return h264_fmo_map_type;
543 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
544 return mpeg_mpeg4_level;
545 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
546 return mpeg4_profile;
547 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
548 return vpx_golden_frame_sel;
549 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
550 return jpeg_chroma_subsampling;
551 case V4L2_CID_DV_TX_MODE:
552 return dv_tx_mode;
553 case V4L2_CID_DV_TX_RGB_RANGE:
554 case V4L2_CID_DV_RX_RGB_RANGE:
555 return dv_rgb_range;
556
557 default:
558 return NULL;
559 }
560 }
561 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
562
563 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
564 /*
565 * Returns NULL or an s64 type array containing the menu for given
566 * control ID. The total number of the menu items is returned in @len.
567 */
568 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
569 {
570 static const s64 qmenu_int_vpx_num_partitions[] = {
571 1, 2, 4, 8,
572 };
573
574 static const s64 qmenu_int_vpx_num_ref_frames[] = {
575 1, 2, 3,
576 };
577
578 switch (id) {
579 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
580 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
581 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
582 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
583 default:
584 *len = 0;
585 return NULL;
586 }
587 }
588 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
589
590 /* Return the control name. */
591 const char *v4l2_ctrl_get_name(u32 id)
592 {
593 switch (id) {
594 /* USER controls */
595 /* Keep the order of the 'case's the same as in videodev2.h! */
596 case V4L2_CID_USER_CLASS: return "User Controls";
597 case V4L2_CID_BRIGHTNESS: return "Brightness";
598 case V4L2_CID_CONTRAST: return "Contrast";
599 case V4L2_CID_SATURATION: return "Saturation";
600 case V4L2_CID_HUE: return "Hue";
601 case V4L2_CID_AUDIO_VOLUME: return "Volume";
602 case V4L2_CID_AUDIO_BALANCE: return "Balance";
603 case V4L2_CID_AUDIO_BASS: return "Bass";
604 case V4L2_CID_AUDIO_TREBLE: return "Treble";
605 case V4L2_CID_AUDIO_MUTE: return "Mute";
606 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
607 case V4L2_CID_BLACK_LEVEL: return "Black Level";
608 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
609 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
610 case V4L2_CID_RED_BALANCE: return "Red Balance";
611 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
612 case V4L2_CID_GAMMA: return "Gamma";
613 case V4L2_CID_EXPOSURE: return "Exposure";
614 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
615 case V4L2_CID_GAIN: return "Gain";
616 case V4L2_CID_HFLIP: return "Horizontal Flip";
617 case V4L2_CID_VFLIP: return "Vertical Flip";
618 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
619 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
620 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
621 case V4L2_CID_SHARPNESS: return "Sharpness";
622 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
623 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
624 case V4L2_CID_COLOR_KILLER: return "Color Killer";
625 case V4L2_CID_COLORFX: return "Color Effects";
626 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
627 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
628 case V4L2_CID_ROTATE: return "Rotate";
629 case V4L2_CID_BG_COLOR: return "Background Color";
630 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
631 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
632 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
633 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
634 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
635 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
636 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
637
638 /* Codec controls */
639 /* The MPEG controls are applicable to all codec controls
640 * and the 'MPEG' part of the define is historical */
641 /* Keep the order of the 'case's the same as in videodev2.h! */
642 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
643 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
644 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
645 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
646 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
647 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
648 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
649 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
650 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
651 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
652 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
653 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
654 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
655 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
656 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
657 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
658 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
659 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
660 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
661 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
662 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
663 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
664 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
665 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
666 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
667 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
668 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
669 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
670 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
671 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
672 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
673 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
674 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
675 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
676 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
677 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
678 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
679 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
680 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
681 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
682 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
683 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
684 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
685 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
686 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
687 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
688 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
689 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
690 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
691 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
692 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
693 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
694 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
695 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
696 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
697 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
698 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
699 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
700 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
701 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
702 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
703 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
704 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
705 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
706 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
707 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
708 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
709 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
710 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
711 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
712 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
713 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
714 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
715 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
716 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
717 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
718 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
719 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
720 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
721 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
722 return "H264 Set QP Value for HC Layers";
723 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
724 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
725 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
726 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
727 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
728 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
729 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
730 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
731 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
732 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
733 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
734 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
735 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
736 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
737 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
738 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
739
740 /* VPX controls */
741 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
742 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
743 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
744 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
745 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
746 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
747 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
748 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
749 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
750 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
751 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
752 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
753
754 /* CAMERA controls */
755 /* Keep the order of the 'case's the same as in videodev2.h! */
756 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
757 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
758 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
759 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
760 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
761 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
762 case V4L2_CID_PAN_RESET: return "Pan, Reset";
763 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
764 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
765 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
766 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
767 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
768 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
769 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
770 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
771 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
772 case V4L2_CID_PRIVACY: return "Privacy";
773 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
774 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
775 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
776 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
777 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
778 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
779 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
780 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
781 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
782 case V4L2_CID_SCENE_MODE: return "Scene Mode";
783 case V4L2_CID_3A_LOCK: return "3A Lock";
784 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
785 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
786 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
787 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
788
789 /* FM Radio Modulator control */
790 /* Keep the order of the 'case's the same as in videodev2.h! */
791 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
792 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
793 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
794 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
795 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
796 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
797 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
798 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
799 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
800 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
801 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
802 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
803 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
804 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
805 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
806 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
807 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
808 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
809 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
810 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
811
812 /* Flash controls */
813 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
814 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
815 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
816 case V4L2_CID_FLASH_STROBE: return "Strobe";
817 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
818 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
819 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
820 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
821 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
822 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
823 case V4L2_CID_FLASH_FAULT: return "Faults";
824 case V4L2_CID_FLASH_CHARGE: return "Charge";
825 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
826
827 /* JPEG encoder controls */
828 /* Keep the order of the 'case's the same as in videodev2.h! */
829 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
830 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
831 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
832 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
833 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
834
835 /* Image source controls */
836 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
837 case V4L2_CID_VBLANK: return "Vertical Blanking";
838 case V4L2_CID_HBLANK: return "Horizontal Blanking";
839 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
840
841 /* Image processing controls */
842 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
843 case V4L2_CID_LINK_FREQ: return "Link Frequency";
844 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
845 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
846
847 /* DV controls */
848 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
849 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
850 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
851 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
852 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
853 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
854 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
855 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
856
857 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
858 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
859 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
860 default:
861 return NULL;
862 }
863 }
864 EXPORT_SYMBOL(v4l2_ctrl_get_name);
865
866 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
867 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
868 {
869 *name = v4l2_ctrl_get_name(id);
870 *flags = 0;
871
872 switch (id) {
873 case V4L2_CID_AUDIO_MUTE:
874 case V4L2_CID_AUDIO_LOUDNESS:
875 case V4L2_CID_AUTO_WHITE_BALANCE:
876 case V4L2_CID_AUTOGAIN:
877 case V4L2_CID_HFLIP:
878 case V4L2_CID_VFLIP:
879 case V4L2_CID_HUE_AUTO:
880 case V4L2_CID_CHROMA_AGC:
881 case V4L2_CID_COLOR_KILLER:
882 case V4L2_CID_AUTOBRIGHTNESS:
883 case V4L2_CID_MPEG_AUDIO_MUTE:
884 case V4L2_CID_MPEG_VIDEO_MUTE:
885 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
886 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
887 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
888 case V4L2_CID_FOCUS_AUTO:
889 case V4L2_CID_PRIVACY:
890 case V4L2_CID_AUDIO_LIMITER_ENABLED:
891 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
892 case V4L2_CID_PILOT_TONE_ENABLED:
893 case V4L2_CID_ILLUMINATORS_1:
894 case V4L2_CID_ILLUMINATORS_2:
895 case V4L2_CID_FLASH_STROBE_STATUS:
896 case V4L2_CID_FLASH_CHARGE:
897 case V4L2_CID_FLASH_READY:
898 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
899 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
900 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
901 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
902 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
903 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
904 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
905 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
906 case V4L2_CID_WIDE_DYNAMIC_RANGE:
907 case V4L2_CID_IMAGE_STABILIZATION:
908 case V4L2_CID_RDS_RECEPTION:
909 *type = V4L2_CTRL_TYPE_BOOLEAN;
910 *min = 0;
911 *max = *step = 1;
912 break;
913 case V4L2_CID_PAN_RESET:
914 case V4L2_CID_TILT_RESET:
915 case V4L2_CID_FLASH_STROBE:
916 case V4L2_CID_FLASH_STROBE_STOP:
917 case V4L2_CID_AUTO_FOCUS_START:
918 case V4L2_CID_AUTO_FOCUS_STOP:
919 *type = V4L2_CTRL_TYPE_BUTTON;
920 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
921 *min = *max = *step = *def = 0;
922 break;
923 case V4L2_CID_POWER_LINE_FREQUENCY:
924 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
925 case V4L2_CID_MPEG_AUDIO_ENCODING:
926 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
927 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
928 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
929 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
930 case V4L2_CID_MPEG_AUDIO_MODE:
931 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
932 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
933 case V4L2_CID_MPEG_AUDIO_CRC:
934 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
935 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
936 case V4L2_CID_MPEG_VIDEO_ENCODING:
937 case V4L2_CID_MPEG_VIDEO_ASPECT:
938 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
939 case V4L2_CID_MPEG_STREAM_TYPE:
940 case V4L2_CID_MPEG_STREAM_VBI_FMT:
941 case V4L2_CID_EXPOSURE_AUTO:
942 case V4L2_CID_AUTO_FOCUS_RANGE:
943 case V4L2_CID_COLORFX:
944 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
945 case V4L2_CID_TUNE_PREEMPHASIS:
946 case V4L2_CID_FLASH_LED_MODE:
947 case V4L2_CID_FLASH_STROBE_SOURCE:
948 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
949 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
950 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
951 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
952 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
953 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
954 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
955 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
956 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
957 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
958 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
959 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
960 case V4L2_CID_ISO_SENSITIVITY_AUTO:
961 case V4L2_CID_EXPOSURE_METERING:
962 case V4L2_CID_SCENE_MODE:
963 case V4L2_CID_DV_TX_MODE:
964 case V4L2_CID_DV_TX_RGB_RANGE:
965 case V4L2_CID_DV_RX_RGB_RANGE:
966 case V4L2_CID_TEST_PATTERN:
967 case V4L2_CID_TUNE_DEEMPHASIS:
968 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
969 *type = V4L2_CTRL_TYPE_MENU;
970 break;
971 case V4L2_CID_LINK_FREQ:
972 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
973 break;
974 case V4L2_CID_RDS_TX_PS_NAME:
975 case V4L2_CID_RDS_TX_RADIO_TEXT:
976 *type = V4L2_CTRL_TYPE_STRING;
977 break;
978 case V4L2_CID_ISO_SENSITIVITY:
979 case V4L2_CID_AUTO_EXPOSURE_BIAS:
980 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
981 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
982 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
983 break;
984 case V4L2_CID_USER_CLASS:
985 case V4L2_CID_CAMERA_CLASS:
986 case V4L2_CID_MPEG_CLASS:
987 case V4L2_CID_FM_TX_CLASS:
988 case V4L2_CID_FLASH_CLASS:
989 case V4L2_CID_JPEG_CLASS:
990 case V4L2_CID_IMAGE_SOURCE_CLASS:
991 case V4L2_CID_IMAGE_PROC_CLASS:
992 case V4L2_CID_DV_CLASS:
993 case V4L2_CID_FM_RX_CLASS:
994 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
995 /* You can neither read not write these */
996 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
997 *min = *max = *step = *def = 0;
998 break;
999 case V4L2_CID_BG_COLOR:
1000 *type = V4L2_CTRL_TYPE_INTEGER;
1001 *step = 1;
1002 *min = 0;
1003 /* Max is calculated as RGB888 that is 2^24 */
1004 *max = 0xFFFFFF;
1005 break;
1006 case V4L2_CID_FLASH_FAULT:
1007 case V4L2_CID_JPEG_ACTIVE_MARKER:
1008 case V4L2_CID_3A_LOCK:
1009 case V4L2_CID_AUTO_FOCUS_STATUS:
1010 case V4L2_CID_DV_TX_HOTPLUG:
1011 case V4L2_CID_DV_TX_RXSENSE:
1012 case V4L2_CID_DV_TX_EDID_PRESENT:
1013 case V4L2_CID_DV_RX_POWER_PRESENT:
1014 *type = V4L2_CTRL_TYPE_BITMASK;
1015 break;
1016 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1017 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1018 *type = V4L2_CTRL_TYPE_INTEGER;
1019 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1020 break;
1021 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1022 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1023 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1024 /* Fall through */
1025 case V4L2_CID_PIXEL_RATE:
1026 *type = V4L2_CTRL_TYPE_INTEGER64;
1027 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1028 *min = *max = *step = *def = 0;
1029 break;
1030 default:
1031 *type = V4L2_CTRL_TYPE_INTEGER;
1032 break;
1033 }
1034 switch (id) {
1035 case V4L2_CID_MPEG_AUDIO_ENCODING:
1036 case V4L2_CID_MPEG_AUDIO_MODE:
1037 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1038 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1039 case V4L2_CID_MPEG_STREAM_TYPE:
1040 *flags |= V4L2_CTRL_FLAG_UPDATE;
1041 break;
1042 case V4L2_CID_AUDIO_VOLUME:
1043 case V4L2_CID_AUDIO_BALANCE:
1044 case V4L2_CID_AUDIO_BASS:
1045 case V4L2_CID_AUDIO_TREBLE:
1046 case V4L2_CID_BRIGHTNESS:
1047 case V4L2_CID_CONTRAST:
1048 case V4L2_CID_SATURATION:
1049 case V4L2_CID_HUE:
1050 case V4L2_CID_RED_BALANCE:
1051 case V4L2_CID_BLUE_BALANCE:
1052 case V4L2_CID_GAMMA:
1053 case V4L2_CID_SHARPNESS:
1054 case V4L2_CID_CHROMA_GAIN:
1055 case V4L2_CID_RDS_TX_DEVIATION:
1056 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1057 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1058 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1059 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1060 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1061 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1062 case V4L2_CID_PILOT_TONE_DEVIATION:
1063 case V4L2_CID_PILOT_TONE_FREQUENCY:
1064 case V4L2_CID_TUNE_POWER_LEVEL:
1065 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1066 *flags |= V4L2_CTRL_FLAG_SLIDER;
1067 break;
1068 case V4L2_CID_PAN_RELATIVE:
1069 case V4L2_CID_TILT_RELATIVE:
1070 case V4L2_CID_FOCUS_RELATIVE:
1071 case V4L2_CID_IRIS_RELATIVE:
1072 case V4L2_CID_ZOOM_RELATIVE:
1073 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1074 break;
1075 case V4L2_CID_FLASH_STROBE_STATUS:
1076 case V4L2_CID_AUTO_FOCUS_STATUS:
1077 case V4L2_CID_FLASH_READY:
1078 case V4L2_CID_DV_TX_HOTPLUG:
1079 case V4L2_CID_DV_TX_RXSENSE:
1080 case V4L2_CID_DV_TX_EDID_PRESENT:
1081 case V4L2_CID_DV_RX_POWER_PRESENT:
1082 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1083 break;
1084 }
1085 }
1086 EXPORT_SYMBOL(v4l2_ctrl_fill);
1087
1088 /* Helper function to determine whether the control type is compatible with
1089 VIDIOC_G/S_CTRL. */
1090 static bool type_is_int(const struct v4l2_ctrl *ctrl)
1091 {
1092 switch (ctrl->type) {
1093 case V4L2_CTRL_TYPE_INTEGER64:
1094 case V4L2_CTRL_TYPE_STRING:
1095 /* Nope, these need v4l2_ext_control */
1096 return false;
1097 default:
1098 return true;
1099 }
1100 }
1101
1102 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1103 {
1104 memset(ev->reserved, 0, sizeof(ev->reserved));
1105 ev->type = V4L2_EVENT_CTRL;
1106 ev->id = ctrl->id;
1107 ev->u.ctrl.changes = changes;
1108 ev->u.ctrl.type = ctrl->type;
1109 ev->u.ctrl.flags = ctrl->flags;
1110 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
1111 ev->u.ctrl.value64 = 0;
1112 else
1113 ev->u.ctrl.value64 = ctrl->cur.val64;
1114 ev->u.ctrl.minimum = ctrl->minimum;
1115 ev->u.ctrl.maximum = ctrl->maximum;
1116 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1117 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1118 ev->u.ctrl.step = 1;
1119 else
1120 ev->u.ctrl.step = ctrl->step;
1121 ev->u.ctrl.default_value = ctrl->default_value;
1122 }
1123
1124 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1125 {
1126 struct v4l2_event ev;
1127 struct v4l2_subscribed_event *sev;
1128
1129 if (list_empty(&ctrl->ev_subs))
1130 return;
1131 fill_event(&ev, ctrl, changes);
1132
1133 list_for_each_entry(sev, &ctrl->ev_subs, node)
1134 if (sev->fh != fh ||
1135 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1136 v4l2_event_queue_fh(sev->fh, &ev);
1137 }
1138
1139 /* Helper function: copy the current control value back to the caller */
1140 static int cur_to_user(struct v4l2_ext_control *c,
1141 struct v4l2_ctrl *ctrl)
1142 {
1143 u32 len;
1144
1145 switch (ctrl->type) {
1146 case V4L2_CTRL_TYPE_STRING:
1147 len = strlen(ctrl->cur.string);
1148 if (c->size < len + 1) {
1149 c->size = len + 1;
1150 return -ENOSPC;
1151 }
1152 return copy_to_user(c->string, ctrl->cur.string,
1153 len + 1) ? -EFAULT : 0;
1154 case V4L2_CTRL_TYPE_INTEGER64:
1155 c->value64 = ctrl->cur.val64;
1156 break;
1157 default:
1158 c->value = ctrl->cur.val;
1159 break;
1160 }
1161 return 0;
1162 }
1163
1164 /* Helper function: copy the caller-provider value as the new control value */
1165 static int user_to_new(struct v4l2_ext_control *c,
1166 struct v4l2_ctrl *ctrl)
1167 {
1168 int ret;
1169 u32 size;
1170
1171 ctrl->is_new = 1;
1172 switch (ctrl->type) {
1173 case V4L2_CTRL_TYPE_INTEGER64:
1174 ctrl->val64 = c->value64;
1175 break;
1176 case V4L2_CTRL_TYPE_STRING:
1177 size = c->size;
1178 if (size == 0)
1179 return -ERANGE;
1180 if (size > ctrl->maximum + 1)
1181 size = ctrl->maximum + 1;
1182 ret = copy_from_user(ctrl->string, c->string, size);
1183 if (!ret) {
1184 char last = ctrl->string[size - 1];
1185
1186 ctrl->string[size - 1] = 0;
1187 /* If the string was longer than ctrl->maximum,
1188 then return an error. */
1189 if (strlen(ctrl->string) == ctrl->maximum && last)
1190 return -ERANGE;
1191 }
1192 return ret ? -EFAULT : 0;
1193 default:
1194 ctrl->val = c->value;
1195 break;
1196 }
1197 return 0;
1198 }
1199
1200 /* Helper function: copy the new control value back to the caller */
1201 static int new_to_user(struct v4l2_ext_control *c,
1202 struct v4l2_ctrl *ctrl)
1203 {
1204 u32 len;
1205
1206 switch (ctrl->type) {
1207 case V4L2_CTRL_TYPE_STRING:
1208 len = strlen(ctrl->string);
1209 if (c->size < len + 1) {
1210 c->size = ctrl->maximum + 1;
1211 return -ENOSPC;
1212 }
1213 return copy_to_user(c->string, ctrl->string,
1214 len + 1) ? -EFAULT : 0;
1215 case V4L2_CTRL_TYPE_INTEGER64:
1216 c->value64 = ctrl->val64;
1217 break;
1218 default:
1219 c->value = ctrl->val;
1220 break;
1221 }
1222 return 0;
1223 }
1224
1225 /* Copy the new value to the current value. */
1226 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1227 {
1228 bool changed = false;
1229
1230 if (ctrl == NULL)
1231 return;
1232 switch (ctrl->type) {
1233 case V4L2_CTRL_TYPE_BUTTON:
1234 changed = true;
1235 break;
1236 case V4L2_CTRL_TYPE_STRING:
1237 /* strings are always 0-terminated */
1238 changed = strcmp(ctrl->string, ctrl->cur.string);
1239 strcpy(ctrl->cur.string, ctrl->string);
1240 break;
1241 case V4L2_CTRL_TYPE_INTEGER64:
1242 changed = ctrl->val64 != ctrl->cur.val64;
1243 ctrl->cur.val64 = ctrl->val64;
1244 break;
1245 default:
1246 changed = ctrl->val != ctrl->cur.val;
1247 ctrl->cur.val = ctrl->val;
1248 break;
1249 }
1250 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1251 /* Note: CH_FLAGS is only set for auto clusters. */
1252 ctrl->flags &=
1253 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1254 if (!is_cur_manual(ctrl->cluster[0])) {
1255 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1256 if (ctrl->cluster[0]->has_volatiles)
1257 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1258 }
1259 fh = NULL;
1260 }
1261 if (changed || ch_flags) {
1262 /* If a control was changed that was not one of the controls
1263 modified by the application, then send the event to all. */
1264 if (!ctrl->is_new)
1265 fh = NULL;
1266 send_event(fh, ctrl,
1267 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1268 if (ctrl->call_notify && changed && ctrl->handler->notify)
1269 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1270 }
1271 }
1272
1273 /* Copy the current value to the new value */
1274 static void cur_to_new(struct v4l2_ctrl *ctrl)
1275 {
1276 if (ctrl == NULL)
1277 return;
1278 switch (ctrl->type) {
1279 case V4L2_CTRL_TYPE_STRING:
1280 /* strings are always 0-terminated */
1281 strcpy(ctrl->string, ctrl->cur.string);
1282 break;
1283 case V4L2_CTRL_TYPE_INTEGER64:
1284 ctrl->val64 = ctrl->cur.val64;
1285 break;
1286 default:
1287 ctrl->val = ctrl->cur.val;
1288 break;
1289 }
1290 }
1291
1292 /* Return non-zero if one or more of the controls in the cluster has a new
1293 value that differs from the current value. */
1294 static int cluster_changed(struct v4l2_ctrl *master)
1295 {
1296 int diff = 0;
1297 int i;
1298
1299 for (i = 0; !diff && i < master->ncontrols; i++) {
1300 struct v4l2_ctrl *ctrl = master->cluster[i];
1301
1302 if (ctrl == NULL)
1303 continue;
1304 switch (ctrl->type) {
1305 case V4L2_CTRL_TYPE_BUTTON:
1306 /* Button controls are always 'different' */
1307 return 1;
1308 case V4L2_CTRL_TYPE_STRING:
1309 /* strings are always 0-terminated */
1310 diff = strcmp(ctrl->string, ctrl->cur.string);
1311 break;
1312 case V4L2_CTRL_TYPE_INTEGER64:
1313 diff = ctrl->val64 != ctrl->cur.val64;
1314 break;
1315 default:
1316 diff = ctrl->val != ctrl->cur.val;
1317 break;
1318 }
1319 }
1320 return diff;
1321 }
1322
1323 /* Control range checking */
1324 static int check_range(enum v4l2_ctrl_type type,
1325 s32 min, s32 max, u32 step, s32 def)
1326 {
1327 switch (type) {
1328 case V4L2_CTRL_TYPE_BOOLEAN:
1329 if (step != 1 || max > 1 || min < 0)
1330 return -ERANGE;
1331 /* fall through */
1332 case V4L2_CTRL_TYPE_INTEGER:
1333 if (step <= 0 || min > max || def < min || def > max)
1334 return -ERANGE;
1335 return 0;
1336 case V4L2_CTRL_TYPE_BITMASK:
1337 if (step || min || !max || (def & ~max))
1338 return -ERANGE;
1339 return 0;
1340 case V4L2_CTRL_TYPE_MENU:
1341 case V4L2_CTRL_TYPE_INTEGER_MENU:
1342 if (min > max || def < min || def > max)
1343 return -ERANGE;
1344 /* Note: step == menu_skip_mask for menu controls.
1345 So here we check if the default value is masked out. */
1346 if (step && ((1 << def) & step))
1347 return -EINVAL;
1348 return 0;
1349 case V4L2_CTRL_TYPE_STRING:
1350 if (min > max || min < 0 || step < 1 || def)
1351 return -ERANGE;
1352 return 0;
1353 default:
1354 return 0;
1355 }
1356 }
1357
1358 /* Validate a new control */
1359 static int validate_new(const struct v4l2_ctrl *ctrl,
1360 struct v4l2_ext_control *c)
1361 {
1362 size_t len;
1363 u32 offset;
1364 s32 val;
1365
1366 switch (ctrl->type) {
1367 case V4L2_CTRL_TYPE_INTEGER:
1368 /* Round towards the closest legal value */
1369 val = c->value + ctrl->step / 2;
1370 val = clamp(val, ctrl->minimum, ctrl->maximum);
1371 offset = val - ctrl->minimum;
1372 offset = ctrl->step * (offset / ctrl->step);
1373 c->value = ctrl->minimum + offset;
1374 return 0;
1375
1376 case V4L2_CTRL_TYPE_BOOLEAN:
1377 c->value = !!c->value;
1378 return 0;
1379
1380 case V4L2_CTRL_TYPE_MENU:
1381 case V4L2_CTRL_TYPE_INTEGER_MENU:
1382 if (c->value < ctrl->minimum || c->value > ctrl->maximum)
1383 return -ERANGE;
1384 if (ctrl->menu_skip_mask & (1 << c->value))
1385 return -EINVAL;
1386 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1387 ctrl->qmenu[c->value][0] == '\0')
1388 return -EINVAL;
1389 return 0;
1390
1391 case V4L2_CTRL_TYPE_BITMASK:
1392 c->value &= ctrl->maximum;
1393 return 0;
1394
1395 case V4L2_CTRL_TYPE_BUTTON:
1396 case V4L2_CTRL_TYPE_CTRL_CLASS:
1397 c->value = 0;
1398 return 0;
1399
1400 case V4L2_CTRL_TYPE_INTEGER64:
1401 return 0;
1402
1403 case V4L2_CTRL_TYPE_STRING:
1404 len = strlen(c->string);
1405 if (len < ctrl->minimum)
1406 return -ERANGE;
1407 if ((len - ctrl->minimum) % ctrl->step)
1408 return -ERANGE;
1409 return 0;
1410
1411 default:
1412 return -EINVAL;
1413 }
1414 }
1415
1416 static inline u32 node2id(struct list_head *node)
1417 {
1418 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1419 }
1420
1421 /* Set the handler's error code if it wasn't set earlier already */
1422 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1423 {
1424 if (hdl->error == 0)
1425 hdl->error = err;
1426 return err;
1427 }
1428
1429 /* Initialize the handler */
1430 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1431 unsigned nr_of_controls_hint,
1432 struct lock_class_key *key, const char *name)
1433 {
1434 hdl->lock = &hdl->_lock;
1435 mutex_init(hdl->lock);
1436 lockdep_set_class_and_name(hdl->lock, key, name);
1437 INIT_LIST_HEAD(&hdl->ctrls);
1438 INIT_LIST_HEAD(&hdl->ctrl_refs);
1439 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1440 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1441 GFP_KERNEL);
1442 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1443 return hdl->error;
1444 }
1445 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1446
1447 /* Free all controls and control refs */
1448 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1449 {
1450 struct v4l2_ctrl_ref *ref, *next_ref;
1451 struct v4l2_ctrl *ctrl, *next_ctrl;
1452 struct v4l2_subscribed_event *sev, *next_sev;
1453
1454 if (hdl == NULL || hdl->buckets == NULL)
1455 return;
1456
1457 mutex_lock(hdl->lock);
1458 /* Free all nodes */
1459 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1460 list_del(&ref->node);
1461 kfree(ref);
1462 }
1463 /* Free all controls owned by the handler */
1464 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1465 list_del(&ctrl->node);
1466 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1467 list_del(&sev->node);
1468 kfree(ctrl);
1469 }
1470 kfree(hdl->buckets);
1471 hdl->buckets = NULL;
1472 hdl->cached = NULL;
1473 hdl->error = 0;
1474 mutex_unlock(hdl->lock);
1475 }
1476 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1477
1478 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1479 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1480 with applications that do not use the NEXT_CTRL flag.
1481
1482 We just find the n-th private user control. It's O(N), but that should not
1483 be an issue in this particular case. */
1484 static struct v4l2_ctrl_ref *find_private_ref(
1485 struct v4l2_ctrl_handler *hdl, u32 id)
1486 {
1487 struct v4l2_ctrl_ref *ref;
1488
1489 id -= V4L2_CID_PRIVATE_BASE;
1490 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1491 /* Search for private user controls that are compatible with
1492 VIDIOC_G/S_CTRL. */
1493 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1494 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1495 if (!type_is_int(ref->ctrl))
1496 continue;
1497 if (id == 0)
1498 return ref;
1499 id--;
1500 }
1501 }
1502 return NULL;
1503 }
1504
1505 /* Find a control with the given ID. */
1506 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1507 {
1508 struct v4l2_ctrl_ref *ref;
1509 int bucket;
1510
1511 id &= V4L2_CTRL_ID_MASK;
1512
1513 /* Old-style private controls need special handling */
1514 if (id >= V4L2_CID_PRIVATE_BASE)
1515 return find_private_ref(hdl, id);
1516 bucket = id % hdl->nr_of_buckets;
1517
1518 /* Simple optimization: cache the last control found */
1519 if (hdl->cached && hdl->cached->ctrl->id == id)
1520 return hdl->cached;
1521
1522 /* Not in cache, search the hash */
1523 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1524 while (ref && ref->ctrl->id != id)
1525 ref = ref->next;
1526
1527 if (ref)
1528 hdl->cached = ref; /* cache it! */
1529 return ref;
1530 }
1531
1532 /* Find a control with the given ID. Take the handler's lock first. */
1533 static struct v4l2_ctrl_ref *find_ref_lock(
1534 struct v4l2_ctrl_handler *hdl, u32 id)
1535 {
1536 struct v4l2_ctrl_ref *ref = NULL;
1537
1538 if (hdl) {
1539 mutex_lock(hdl->lock);
1540 ref = find_ref(hdl, id);
1541 mutex_unlock(hdl->lock);
1542 }
1543 return ref;
1544 }
1545
1546 /* Find a control with the given ID. */
1547 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1548 {
1549 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1550
1551 return ref ? ref->ctrl : NULL;
1552 }
1553 EXPORT_SYMBOL(v4l2_ctrl_find);
1554
1555 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1556 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1557 struct v4l2_ctrl *ctrl)
1558 {
1559 struct v4l2_ctrl_ref *ref;
1560 struct v4l2_ctrl_ref *new_ref;
1561 u32 id = ctrl->id;
1562 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1563 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1564
1565 /* Automatically add the control class if it is not yet present. */
1566 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1567 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1568 return hdl->error;
1569
1570 if (hdl->error)
1571 return hdl->error;
1572
1573 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1574 if (!new_ref)
1575 return handler_set_err(hdl, -ENOMEM);
1576 new_ref->ctrl = ctrl;
1577 if (ctrl->handler == hdl) {
1578 /* By default each control starts in a cluster of its own.
1579 new_ref->ctrl is basically a cluster array with one
1580 element, so that's perfect to use as the cluster pointer.
1581 But only do this for the handler that owns the control. */
1582 ctrl->cluster = &new_ref->ctrl;
1583 ctrl->ncontrols = 1;
1584 }
1585
1586 INIT_LIST_HEAD(&new_ref->node);
1587
1588 mutex_lock(hdl->lock);
1589
1590 /* Add immediately at the end of the list if the list is empty, or if
1591 the last element in the list has a lower ID.
1592 This ensures that when elements are added in ascending order the
1593 insertion is an O(1) operation. */
1594 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1595 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1596 goto insert_in_hash;
1597 }
1598
1599 /* Find insert position in sorted list */
1600 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1601 if (ref->ctrl->id < id)
1602 continue;
1603 /* Don't add duplicates */
1604 if (ref->ctrl->id == id) {
1605 kfree(new_ref);
1606 goto unlock;
1607 }
1608 list_add(&new_ref->node, ref->node.prev);
1609 break;
1610 }
1611
1612 insert_in_hash:
1613 /* Insert the control node in the hash */
1614 new_ref->next = hdl->buckets[bucket];
1615 hdl->buckets[bucket] = new_ref;
1616
1617 unlock:
1618 mutex_unlock(hdl->lock);
1619 return 0;
1620 }
1621
1622 /* Add a new control */
1623 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1624 const struct v4l2_ctrl_ops *ops,
1625 u32 id, const char *name, enum v4l2_ctrl_type type,
1626 s32 min, s32 max, u32 step, s32 def,
1627 u32 flags, const char * const *qmenu,
1628 const s64 *qmenu_int, void *priv)
1629 {
1630 struct v4l2_ctrl *ctrl;
1631 unsigned sz_extra = 0;
1632 int err;
1633
1634 if (hdl->error)
1635 return NULL;
1636
1637 /* Sanity checks */
1638 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1639 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1640 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1641 handler_set_err(hdl, -ERANGE);
1642 return NULL;
1643 }
1644 err = check_range(type, min, max, step, def);
1645 if (err) {
1646 handler_set_err(hdl, err);
1647 return NULL;
1648 }
1649 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1650 handler_set_err(hdl, -ERANGE);
1651 return NULL;
1652 }
1653
1654 if (type == V4L2_CTRL_TYPE_BUTTON)
1655 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1656 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1657 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1658 else if (type == V4L2_CTRL_TYPE_STRING)
1659 sz_extra += 2 * (max + 1);
1660
1661 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1662 if (ctrl == NULL) {
1663 handler_set_err(hdl, -ENOMEM);
1664 return NULL;
1665 }
1666
1667 INIT_LIST_HEAD(&ctrl->node);
1668 INIT_LIST_HEAD(&ctrl->ev_subs);
1669 ctrl->handler = hdl;
1670 ctrl->ops = ops;
1671 ctrl->id = id;
1672 ctrl->name = name;
1673 ctrl->type = type;
1674 ctrl->flags = flags;
1675 ctrl->minimum = min;
1676 ctrl->maximum = max;
1677 ctrl->step = step;
1678 if (type == V4L2_CTRL_TYPE_MENU)
1679 ctrl->qmenu = qmenu;
1680 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1681 ctrl->qmenu_int = qmenu_int;
1682 ctrl->priv = priv;
1683 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1684
1685 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1686 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1687 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1688 if (ctrl->minimum)
1689 memset(ctrl->cur.string, ' ', ctrl->minimum);
1690 }
1691 if (handler_new_ref(hdl, ctrl)) {
1692 kfree(ctrl);
1693 return NULL;
1694 }
1695 mutex_lock(hdl->lock);
1696 list_add_tail(&ctrl->node, &hdl->ctrls);
1697 mutex_unlock(hdl->lock);
1698 return ctrl;
1699 }
1700
1701 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1702 const struct v4l2_ctrl_config *cfg, void *priv)
1703 {
1704 bool is_menu;
1705 struct v4l2_ctrl *ctrl;
1706 const char *name = cfg->name;
1707 const char * const *qmenu = cfg->qmenu;
1708 const s64 *qmenu_int = cfg->qmenu_int;
1709 enum v4l2_ctrl_type type = cfg->type;
1710 u32 flags = cfg->flags;
1711 s32 min = cfg->min;
1712 s32 max = cfg->max;
1713 u32 step = cfg->step;
1714 s32 def = cfg->def;
1715
1716 if (name == NULL)
1717 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1718 &def, &flags);
1719
1720 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
1721 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
1722 if (is_menu)
1723 WARN_ON(step);
1724 else
1725 WARN_ON(cfg->menu_skip_mask);
1726 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
1727 qmenu = v4l2_ctrl_get_menu(cfg->id);
1728 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
1729 qmenu_int == NULL) {
1730 handler_set_err(hdl, -EINVAL);
1731 return NULL;
1732 }
1733
1734 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1735 type, min, max,
1736 is_menu ? cfg->menu_skip_mask : step,
1737 def, flags, qmenu, qmenu_int, priv);
1738 if (ctrl)
1739 ctrl->is_private = cfg->is_private;
1740 return ctrl;
1741 }
1742 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1743
1744 /* Helper function for standard non-menu controls */
1745 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1746 const struct v4l2_ctrl_ops *ops,
1747 u32 id, s32 min, s32 max, u32 step, s32 def)
1748 {
1749 const char *name;
1750 enum v4l2_ctrl_type type;
1751 u32 flags;
1752
1753 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1754 if (type == V4L2_CTRL_TYPE_MENU
1755 || type == V4L2_CTRL_TYPE_INTEGER_MENU) {
1756 handler_set_err(hdl, -EINVAL);
1757 return NULL;
1758 }
1759 return v4l2_ctrl_new(hdl, ops, id, name, type,
1760 min, max, step, def, flags, NULL, NULL, NULL);
1761 }
1762 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1763
1764 /* Helper function for standard menu controls */
1765 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1766 const struct v4l2_ctrl_ops *ops,
1767 u32 id, s32 max, s32 mask, s32 def)
1768 {
1769 const char * const *qmenu = NULL;
1770 const s64 *qmenu_int = NULL;
1771 unsigned int qmenu_int_len = 0;
1772 const char *name;
1773 enum v4l2_ctrl_type type;
1774 s32 min;
1775 s32 step;
1776 u32 flags;
1777
1778 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1779
1780 if (type == V4L2_CTRL_TYPE_MENU)
1781 qmenu = v4l2_ctrl_get_menu(id);
1782 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1783 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
1784
1785 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
1786 handler_set_err(hdl, -EINVAL);
1787 return NULL;
1788 }
1789 return v4l2_ctrl_new(hdl, ops, id, name, type,
1790 0, max, mask, def, flags, qmenu, qmenu_int, NULL);
1791 }
1792 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1793
1794 /* Helper function for standard menu controls with driver defined menu */
1795 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
1796 const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
1797 s32 mask, s32 def, const char * const *qmenu)
1798 {
1799 enum v4l2_ctrl_type type;
1800 const char *name;
1801 u32 flags;
1802 s32 step;
1803 s32 min;
1804
1805 /* v4l2_ctrl_new_std_menu_items() should only be called for
1806 * standard controls without a standard menu.
1807 */
1808 if (v4l2_ctrl_get_menu(id)) {
1809 handler_set_err(hdl, -EINVAL);
1810 return NULL;
1811 }
1812
1813 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1814 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
1815 handler_set_err(hdl, -EINVAL);
1816 return NULL;
1817 }
1818 return v4l2_ctrl_new(hdl, ops, id, name, type, 0, max, mask, def,
1819 flags, qmenu, NULL, NULL);
1820
1821 }
1822 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
1823
1824 /* Helper function for standard integer menu controls */
1825 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
1826 const struct v4l2_ctrl_ops *ops,
1827 u32 id, s32 max, s32 def, const s64 *qmenu_int)
1828 {
1829 const char *name;
1830 enum v4l2_ctrl_type type;
1831 s32 min;
1832 s32 step;
1833 u32 flags;
1834
1835 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1836 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
1837 handler_set_err(hdl, -EINVAL);
1838 return NULL;
1839 }
1840 return v4l2_ctrl_new(hdl, ops, id, name, type,
1841 0, max, 0, def, flags, NULL, qmenu_int, NULL);
1842 }
1843 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
1844
1845 /* Add a control from another handler to this handler */
1846 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1847 struct v4l2_ctrl *ctrl)
1848 {
1849 if (hdl == NULL || hdl->error)
1850 return NULL;
1851 if (ctrl == NULL) {
1852 handler_set_err(hdl, -EINVAL);
1853 return NULL;
1854 }
1855 if (ctrl->handler == hdl)
1856 return ctrl;
1857 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1858 }
1859 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1860
1861 /* Add the controls from another handler to our own. */
1862 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1863 struct v4l2_ctrl_handler *add,
1864 bool (*filter)(const struct v4l2_ctrl *ctrl))
1865 {
1866 struct v4l2_ctrl_ref *ref;
1867 int ret = 0;
1868
1869 /* Do nothing if either handler is NULL or if they are the same */
1870 if (!hdl || !add || hdl == add)
1871 return 0;
1872 if (hdl->error)
1873 return hdl->error;
1874 mutex_lock(add->lock);
1875 list_for_each_entry(ref, &add->ctrl_refs, node) {
1876 struct v4l2_ctrl *ctrl = ref->ctrl;
1877
1878 /* Skip handler-private controls. */
1879 if (ctrl->is_private)
1880 continue;
1881 /* And control classes */
1882 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1883 continue;
1884 /* Filter any unwanted controls */
1885 if (filter && !filter(ctrl))
1886 continue;
1887 ret = handler_new_ref(hdl, ctrl);
1888 if (ret)
1889 break;
1890 }
1891 mutex_unlock(add->lock);
1892 return ret;
1893 }
1894 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1895
1896 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
1897 {
1898 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
1899 return true;
1900 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
1901 return true;
1902 switch (ctrl->id) {
1903 case V4L2_CID_AUDIO_MUTE:
1904 case V4L2_CID_AUDIO_VOLUME:
1905 case V4L2_CID_AUDIO_BALANCE:
1906 case V4L2_CID_AUDIO_BASS:
1907 case V4L2_CID_AUDIO_TREBLE:
1908 case V4L2_CID_AUDIO_LOUDNESS:
1909 return true;
1910 default:
1911 break;
1912 }
1913 return false;
1914 }
1915 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
1916
1917 /* Cluster controls */
1918 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1919 {
1920 bool has_volatiles = false;
1921 int i;
1922
1923 /* The first control is the master control and it must not be NULL */
1924 BUG_ON(ncontrols == 0 || controls[0] == NULL);
1925
1926 for (i = 0; i < ncontrols; i++) {
1927 if (controls[i]) {
1928 controls[i]->cluster = controls;
1929 controls[i]->ncontrols = ncontrols;
1930 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1931 has_volatiles = true;
1932 }
1933 }
1934 controls[0]->has_volatiles = has_volatiles;
1935 }
1936 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1937
1938 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1939 u8 manual_val, bool set_volatile)
1940 {
1941 struct v4l2_ctrl *master = controls[0];
1942 u32 flag = 0;
1943 int i;
1944
1945 v4l2_ctrl_cluster(ncontrols, controls);
1946 WARN_ON(ncontrols <= 1);
1947 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1948 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1949 master->is_auto = true;
1950 master->has_volatiles = set_volatile;
1951 master->manual_mode_value = manual_val;
1952 master->flags |= V4L2_CTRL_FLAG_UPDATE;
1953
1954 if (!is_cur_manual(master))
1955 flag = V4L2_CTRL_FLAG_INACTIVE |
1956 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1957
1958 for (i = 1; i < ncontrols; i++)
1959 if (controls[i])
1960 controls[i]->flags |= flag;
1961 }
1962 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1963
1964 /* Activate/deactivate a control. */
1965 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1966 {
1967 /* invert since the actual flag is called 'inactive' */
1968 bool inactive = !active;
1969 bool old;
1970
1971 if (ctrl == NULL)
1972 return;
1973
1974 if (inactive)
1975 /* set V4L2_CTRL_FLAG_INACTIVE */
1976 old = test_and_set_bit(4, &ctrl->flags);
1977 else
1978 /* clear V4L2_CTRL_FLAG_INACTIVE */
1979 old = test_and_clear_bit(4, &ctrl->flags);
1980 if (old != inactive)
1981 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1982 }
1983 EXPORT_SYMBOL(v4l2_ctrl_activate);
1984
1985 /* Grab/ungrab a control.
1986 Typically used when streaming starts and you want to grab controls,
1987 preventing the user from changing them.
1988
1989 Just call this and the framework will block any attempts to change
1990 these controls. */
1991 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1992 {
1993 bool old;
1994
1995 if (ctrl == NULL)
1996 return;
1997
1998 v4l2_ctrl_lock(ctrl);
1999 if (grabbed)
2000 /* set V4L2_CTRL_FLAG_GRABBED */
2001 old = test_and_set_bit(1, &ctrl->flags);
2002 else
2003 /* clear V4L2_CTRL_FLAG_GRABBED */
2004 old = test_and_clear_bit(1, &ctrl->flags);
2005 if (old != grabbed)
2006 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2007 v4l2_ctrl_unlock(ctrl);
2008 }
2009 EXPORT_SYMBOL(v4l2_ctrl_grab);
2010
2011 /* Log the control name and value */
2012 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2013 const char *prefix, const char *colon)
2014 {
2015 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2016 return;
2017 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2018 return;
2019
2020 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
2021
2022 switch (ctrl->type) {
2023 case V4L2_CTRL_TYPE_INTEGER:
2024 printk(KERN_CONT "%d", ctrl->cur.val);
2025 break;
2026 case V4L2_CTRL_TYPE_BOOLEAN:
2027 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
2028 break;
2029 case V4L2_CTRL_TYPE_MENU:
2030 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
2031 break;
2032 case V4L2_CTRL_TYPE_INTEGER_MENU:
2033 printk(KERN_CONT "%lld", ctrl->qmenu_int[ctrl->cur.val]);
2034 break;
2035 case V4L2_CTRL_TYPE_BITMASK:
2036 printk(KERN_CONT "0x%08x", ctrl->cur.val);
2037 break;
2038 case V4L2_CTRL_TYPE_INTEGER64:
2039 printk(KERN_CONT "%lld", ctrl->cur.val64);
2040 break;
2041 case V4L2_CTRL_TYPE_STRING:
2042 printk(KERN_CONT "%s", ctrl->cur.string);
2043 break;
2044 default:
2045 printk(KERN_CONT "unknown type %d", ctrl->type);
2046 break;
2047 }
2048 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2049 V4L2_CTRL_FLAG_GRABBED |
2050 V4L2_CTRL_FLAG_VOLATILE)) {
2051 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2052 printk(KERN_CONT " inactive");
2053 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2054 printk(KERN_CONT " grabbed");
2055 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2056 printk(KERN_CONT " volatile");
2057 }
2058 printk(KERN_CONT "\n");
2059 }
2060
2061 /* Log all controls owned by the handler */
2062 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2063 const char *prefix)
2064 {
2065 struct v4l2_ctrl *ctrl;
2066 const char *colon = "";
2067 int len;
2068
2069 if (hdl == NULL)
2070 return;
2071 if (prefix == NULL)
2072 prefix = "";
2073 len = strlen(prefix);
2074 if (len && prefix[len - 1] != ' ')
2075 colon = ": ";
2076 mutex_lock(hdl->lock);
2077 list_for_each_entry(ctrl, &hdl->ctrls, node)
2078 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2079 log_ctrl(ctrl, prefix, colon);
2080 mutex_unlock(hdl->lock);
2081 }
2082 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2083
2084 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2085 {
2086 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2087 return 0;
2088 }
2089 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2090
2091 /* Call s_ctrl for all controls owned by the handler */
2092 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2093 {
2094 struct v4l2_ctrl *ctrl;
2095 int ret = 0;
2096
2097 if (hdl == NULL)
2098 return 0;
2099 mutex_lock(hdl->lock);
2100 list_for_each_entry(ctrl, &hdl->ctrls, node)
2101 ctrl->done = false;
2102
2103 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2104 struct v4l2_ctrl *master = ctrl->cluster[0];
2105 int i;
2106
2107 /* Skip if this control was already handled by a cluster. */
2108 /* Skip button controls and read-only controls. */
2109 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2110 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2111 continue;
2112
2113 for (i = 0; i < master->ncontrols; i++) {
2114 if (master->cluster[i]) {
2115 cur_to_new(master->cluster[i]);
2116 master->cluster[i]->is_new = 1;
2117 master->cluster[i]->done = true;
2118 }
2119 }
2120 ret = call_op(master, s_ctrl);
2121 if (ret)
2122 break;
2123 }
2124 mutex_unlock(hdl->lock);
2125 return ret;
2126 }
2127 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2128
2129 /* Implement VIDIOC_QUERYCTRL */
2130 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2131 {
2132 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2133 struct v4l2_ctrl_ref *ref;
2134 struct v4l2_ctrl *ctrl;
2135
2136 if (hdl == NULL)
2137 return -EINVAL;
2138
2139 mutex_lock(hdl->lock);
2140
2141 /* Try to find it */
2142 ref = find_ref(hdl, id);
2143
2144 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
2145 /* Find the next control with ID > qc->id */
2146
2147 /* Did we reach the end of the control list? */
2148 if (id >= node2id(hdl->ctrl_refs.prev)) {
2149 ref = NULL; /* Yes, so there is no next control */
2150 } else if (ref) {
2151 /* We found a control with the given ID, so just get
2152 the next one in the list. */
2153 ref = list_entry(ref->node.next, typeof(*ref), node);
2154 } else {
2155 /* No control with the given ID exists, so start
2156 searching for the next largest ID. We know there
2157 is one, otherwise the first 'if' above would have
2158 been true. */
2159 list_for_each_entry(ref, &hdl->ctrl_refs, node)
2160 if (id < ref->ctrl->id)
2161 break;
2162 }
2163 }
2164 mutex_unlock(hdl->lock);
2165 if (!ref)
2166 return -EINVAL;
2167
2168 ctrl = ref->ctrl;
2169 memset(qc, 0, sizeof(*qc));
2170 if (id >= V4L2_CID_PRIVATE_BASE)
2171 qc->id = id;
2172 else
2173 qc->id = ctrl->id;
2174 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2175 qc->minimum = ctrl->minimum;
2176 qc->maximum = ctrl->maximum;
2177 qc->default_value = ctrl->default_value;
2178 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2179 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2180 qc->step = 1;
2181 else
2182 qc->step = ctrl->step;
2183 qc->flags = ctrl->flags;
2184 qc->type = ctrl->type;
2185 return 0;
2186 }
2187 EXPORT_SYMBOL(v4l2_queryctrl);
2188
2189 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2190 {
2191 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
2192 return -EINVAL;
2193 return v4l2_queryctrl(sd->ctrl_handler, qc);
2194 }
2195 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2196
2197 /* Implement VIDIOC_QUERYMENU */
2198 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2199 {
2200 struct v4l2_ctrl *ctrl;
2201 u32 i = qm->index;
2202
2203 ctrl = v4l2_ctrl_find(hdl, qm->id);
2204 if (!ctrl)
2205 return -EINVAL;
2206
2207 qm->reserved = 0;
2208 /* Sanity checks */
2209 switch (ctrl->type) {
2210 case V4L2_CTRL_TYPE_MENU:
2211 if (ctrl->qmenu == NULL)
2212 return -EINVAL;
2213 break;
2214 case V4L2_CTRL_TYPE_INTEGER_MENU:
2215 if (ctrl->qmenu_int == NULL)
2216 return -EINVAL;
2217 break;
2218 default:
2219 return -EINVAL;
2220 }
2221
2222 if (i < ctrl->minimum || i > ctrl->maximum)
2223 return -EINVAL;
2224
2225 /* Use mask to see if this menu item should be skipped */
2226 if (ctrl->menu_skip_mask & (1 << i))
2227 return -EINVAL;
2228 /* Empty menu items should also be skipped */
2229 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2230 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2231 return -EINVAL;
2232 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2233 } else {
2234 qm->value = ctrl->qmenu_int[i];
2235 }
2236 return 0;
2237 }
2238 EXPORT_SYMBOL(v4l2_querymenu);
2239
2240 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2241 {
2242 return v4l2_querymenu(sd->ctrl_handler, qm);
2243 }
2244 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2245
2246
2247
2248 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2249
2250 It is not a fully atomic operation, just best-effort only. After all, if
2251 multiple controls have to be set through multiple i2c writes (for example)
2252 then some initial writes may succeed while others fail. Thus leaving the
2253 system in an inconsistent state. The question is how much effort you are
2254 willing to spend on trying to make something atomic that really isn't.
2255
2256 From the point of view of an application the main requirement is that
2257 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2258 error should be returned without actually affecting any controls.
2259
2260 If all the values are correct, then it is acceptable to just give up
2261 in case of low-level errors.
2262
2263 It is important though that the application can tell when only a partial
2264 configuration was done. The way we do that is through the error_idx field
2265 of struct v4l2_ext_controls: if that is equal to the count field then no
2266 controls were affected. Otherwise all controls before that index were
2267 successful in performing their 'get' or 'set' operation, the control at
2268 the given index failed, and you don't know what happened with the controls
2269 after the failed one. Since if they were part of a control cluster they
2270 could have been successfully processed (if a cluster member was encountered
2271 at index < error_idx), they could have failed (if a cluster member was at
2272 error_idx), or they may not have been processed yet (if the first cluster
2273 member appeared after error_idx).
2274
2275 It is all fairly theoretical, though. In practice all you can do is to
2276 bail out. If error_idx == count, then it is an application bug. If
2277 error_idx < count then it is only an application bug if the error code was
2278 EBUSY. That usually means that something started streaming just when you
2279 tried to set the controls. In all other cases it is a driver/hardware
2280 problem and all you can do is to retry or bail out.
2281
2282 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2283 never modifies controls the error_idx is just set to whatever control
2284 has an invalid value.
2285 */
2286
2287 /* Prepare for the extended g/s/try functions.
2288 Find the controls in the control array and do some basic checks. */
2289 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2290 struct v4l2_ext_controls *cs,
2291 struct v4l2_ctrl_helper *helpers)
2292 {
2293 struct v4l2_ctrl_helper *h;
2294 bool have_clusters = false;
2295 u32 i;
2296
2297 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2298 struct v4l2_ext_control *c = &cs->controls[i];
2299 struct v4l2_ctrl_ref *ref;
2300 struct v4l2_ctrl *ctrl;
2301 u32 id = c->id & V4L2_CTRL_ID_MASK;
2302
2303 cs->error_idx = i;
2304
2305 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2306 return -EINVAL;
2307
2308 /* Old-style private controls are not allowed for
2309 extended controls */
2310 if (id >= V4L2_CID_PRIVATE_BASE)
2311 return -EINVAL;
2312 ref = find_ref_lock(hdl, id);
2313 if (ref == NULL)
2314 return -EINVAL;
2315 ctrl = ref->ctrl;
2316 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2317 return -EINVAL;
2318
2319 if (ctrl->cluster[0]->ncontrols > 1)
2320 have_clusters = true;
2321 if (ctrl->cluster[0] != ctrl)
2322 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2323 /* Store the ref to the master control of the cluster */
2324 h->mref = ref;
2325 h->ctrl = ctrl;
2326 /* Initially set next to 0, meaning that there is no other
2327 control in this helper array belonging to the same
2328 cluster */
2329 h->next = 0;
2330 }
2331
2332 /* We are done if there were no controls that belong to a multi-
2333 control cluster. */
2334 if (!have_clusters)
2335 return 0;
2336
2337 /* The code below figures out in O(n) time which controls in the list
2338 belong to the same cluster. */
2339
2340 /* This has to be done with the handler lock taken. */
2341 mutex_lock(hdl->lock);
2342
2343 /* First zero the helper field in the master control references */
2344 for (i = 0; i < cs->count; i++)
2345 helpers[i].mref->helper = NULL;
2346 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2347 struct v4l2_ctrl_ref *mref = h->mref;
2348
2349 /* If the mref->helper is set, then it points to an earlier
2350 helper that belongs to the same cluster. */
2351 if (mref->helper) {
2352 /* Set the next field of mref->helper to the current
2353 index: this means that that earlier helper now
2354 points to the next helper in the same cluster. */
2355 mref->helper->next = i;
2356 /* mref should be set only for the first helper in the
2357 cluster, clear the others. */
2358 h->mref = NULL;
2359 }
2360 /* Point the mref helper to the current helper struct. */
2361 mref->helper = h;
2362 }
2363 mutex_unlock(hdl->lock);
2364 return 0;
2365 }
2366
2367 /* Handles the corner case where cs->count == 0. It checks whether the
2368 specified control class exists. If that class ID is 0, then it checks
2369 whether there are any controls at all. */
2370 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2371 {
2372 if (ctrl_class == 0)
2373 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2374 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2375 }
2376
2377
2378
2379 /* Get extended controls. Allocates the helpers array if needed. */
2380 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2381 {
2382 struct v4l2_ctrl_helper helper[4];
2383 struct v4l2_ctrl_helper *helpers = helper;
2384 int ret;
2385 int i, j;
2386
2387 cs->error_idx = cs->count;
2388 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2389
2390 if (hdl == NULL)
2391 return -EINVAL;
2392
2393 if (cs->count == 0)
2394 return class_check(hdl, cs->ctrl_class);
2395
2396 if (cs->count > ARRAY_SIZE(helper)) {
2397 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2398 GFP_KERNEL);
2399 if (helpers == NULL)
2400 return -ENOMEM;
2401 }
2402
2403 ret = prepare_ext_ctrls(hdl, cs, helpers);
2404 cs->error_idx = cs->count;
2405
2406 for (i = 0; !ret && i < cs->count; i++)
2407 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2408 ret = -EACCES;
2409
2410 for (i = 0; !ret && i < cs->count; i++) {
2411 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2412 struct v4l2_ctrl *ctrl) = cur_to_user;
2413 struct v4l2_ctrl *master;
2414
2415 if (helpers[i].mref == NULL)
2416 continue;
2417
2418 master = helpers[i].mref->ctrl;
2419 cs->error_idx = i;
2420
2421 v4l2_ctrl_lock(master);
2422
2423 /* g_volatile_ctrl will update the new control values */
2424 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2425 (master->has_volatiles && !is_cur_manual(master))) {
2426 for (j = 0; j < master->ncontrols; j++)
2427 cur_to_new(master->cluster[j]);
2428 ret = call_op(master, g_volatile_ctrl);
2429 ctrl_to_user = new_to_user;
2430 }
2431 /* If OK, then copy the current (for non-volatile controls)
2432 or the new (for volatile controls) control values to the
2433 caller */
2434 if (!ret) {
2435 u32 idx = i;
2436
2437 do {
2438 ret = ctrl_to_user(cs->controls + idx,
2439 helpers[idx].ctrl);
2440 idx = helpers[idx].next;
2441 } while (!ret && idx);
2442 }
2443 v4l2_ctrl_unlock(master);
2444 }
2445
2446 if (cs->count > ARRAY_SIZE(helper))
2447 kfree(helpers);
2448 return ret;
2449 }
2450 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2451
2452 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2453 {
2454 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2455 }
2456 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2457
2458 /* Helper function to get a single control */
2459 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2460 {
2461 struct v4l2_ctrl *master = ctrl->cluster[0];
2462 int ret = 0;
2463 int i;
2464
2465 /* String controls are not supported. The new_to_user() and
2466 * cur_to_user() calls below would need to be modified not to access
2467 * userspace memory when called from get_ctrl().
2468 */
2469 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2470 return -EINVAL;
2471
2472 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2473 return -EACCES;
2474
2475 v4l2_ctrl_lock(master);
2476 /* g_volatile_ctrl will update the current control values */
2477 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2478 for (i = 0; i < master->ncontrols; i++)
2479 cur_to_new(master->cluster[i]);
2480 ret = call_op(master, g_volatile_ctrl);
2481 new_to_user(c, ctrl);
2482 } else {
2483 cur_to_user(c, ctrl);
2484 }
2485 v4l2_ctrl_unlock(master);
2486 return ret;
2487 }
2488
2489 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2490 {
2491 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2492 struct v4l2_ext_control c;
2493 int ret;
2494
2495 if (ctrl == NULL || !type_is_int(ctrl))
2496 return -EINVAL;
2497 ret = get_ctrl(ctrl, &c);
2498 control->value = c.value;
2499 return ret;
2500 }
2501 EXPORT_SYMBOL(v4l2_g_ctrl);
2502
2503 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2504 {
2505 return v4l2_g_ctrl(sd->ctrl_handler, control);
2506 }
2507 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2508
2509 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2510 {
2511 struct v4l2_ext_control c;
2512
2513 /* It's a driver bug if this happens. */
2514 WARN_ON(!type_is_int(ctrl));
2515 c.value = 0;
2516 get_ctrl(ctrl, &c);
2517 return c.value;
2518 }
2519 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2520
2521 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2522 {
2523 struct v4l2_ext_control c;
2524
2525 /* It's a driver bug if this happens. */
2526 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2527 c.value = 0;
2528 get_ctrl(ctrl, &c);
2529 return c.value;
2530 }
2531 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2532
2533
2534 /* Core function that calls try/s_ctrl and ensures that the new value is
2535 copied to the current value on a set.
2536 Must be called with ctrl->handler->lock held. */
2537 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2538 bool set, u32 ch_flags)
2539 {
2540 bool update_flag;
2541 int ret;
2542 int i;
2543
2544 /* Go through the cluster and either validate the new value or
2545 (if no new value was set), copy the current value to the new
2546 value, ensuring a consistent view for the control ops when
2547 called. */
2548 for (i = 0; i < master->ncontrols; i++) {
2549 struct v4l2_ctrl *ctrl = master->cluster[i];
2550
2551 if (ctrl == NULL)
2552 continue;
2553
2554 if (!ctrl->is_new) {
2555 cur_to_new(ctrl);
2556 continue;
2557 }
2558 /* Check again: it may have changed since the
2559 previous check in try_or_set_ext_ctrls(). */
2560 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2561 return -EBUSY;
2562 }
2563
2564 ret = call_op(master, try_ctrl);
2565
2566 /* Don't set if there is no change */
2567 if (ret || !set || !cluster_changed(master))
2568 return ret;
2569 ret = call_op(master, s_ctrl);
2570 if (ret)
2571 return ret;
2572
2573 /* If OK, then make the new values permanent. */
2574 update_flag = is_cur_manual(master) != is_new_manual(master);
2575 for (i = 0; i < master->ncontrols; i++)
2576 new_to_cur(fh, master->cluster[i], ch_flags |
2577 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2578 return 0;
2579 }
2580
2581 /* Validate controls. */
2582 static int validate_ctrls(struct v4l2_ext_controls *cs,
2583 struct v4l2_ctrl_helper *helpers, bool set)
2584 {
2585 unsigned i;
2586 int ret = 0;
2587
2588 cs->error_idx = cs->count;
2589 for (i = 0; i < cs->count; i++) {
2590 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2591
2592 cs->error_idx = i;
2593
2594 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2595 return -EACCES;
2596 /* This test is also done in try_set_control_cluster() which
2597 is called in atomic context, so that has the final say,
2598 but it makes sense to do an up-front check as well. Once
2599 an error occurs in try_set_control_cluster() some other
2600 controls may have been set already and we want to do a
2601 best-effort to avoid that. */
2602 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2603 return -EBUSY;
2604 ret = validate_new(ctrl, &cs->controls[i]);
2605 if (ret)
2606 return ret;
2607 }
2608 return 0;
2609 }
2610
2611 /* Obtain the current volatile values of an autocluster and mark them
2612 as new. */
2613 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2614 {
2615 int i;
2616
2617 for (i = 0; i < master->ncontrols; i++)
2618 cur_to_new(master->cluster[i]);
2619 if (!call_op(master, g_volatile_ctrl))
2620 for (i = 1; i < master->ncontrols; i++)
2621 if (master->cluster[i])
2622 master->cluster[i]->is_new = 1;
2623 }
2624
2625 /* Try or try-and-set controls */
2626 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2627 struct v4l2_ext_controls *cs,
2628 bool set)
2629 {
2630 struct v4l2_ctrl_helper helper[4];
2631 struct v4l2_ctrl_helper *helpers = helper;
2632 unsigned i, j;
2633 int ret;
2634
2635 cs->error_idx = cs->count;
2636 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2637
2638 if (hdl == NULL)
2639 return -EINVAL;
2640
2641 if (cs->count == 0)
2642 return class_check(hdl, cs->ctrl_class);
2643
2644 if (cs->count > ARRAY_SIZE(helper)) {
2645 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2646 GFP_KERNEL);
2647 if (!helpers)
2648 return -ENOMEM;
2649 }
2650 ret = prepare_ext_ctrls(hdl, cs, helpers);
2651 if (!ret)
2652 ret = validate_ctrls(cs, helpers, set);
2653 if (ret && set)
2654 cs->error_idx = cs->count;
2655 for (i = 0; !ret && i < cs->count; i++) {
2656 struct v4l2_ctrl *master;
2657 u32 idx = i;
2658
2659 if (helpers[i].mref == NULL)
2660 continue;
2661
2662 cs->error_idx = i;
2663 master = helpers[i].mref->ctrl;
2664 v4l2_ctrl_lock(master);
2665
2666 /* Reset the 'is_new' flags of the cluster */
2667 for (j = 0; j < master->ncontrols; j++)
2668 if (master->cluster[j])
2669 master->cluster[j]->is_new = 0;
2670
2671 /* For volatile autoclusters that are currently in auto mode
2672 we need to discover if it will be set to manual mode.
2673 If so, then we have to copy the current volatile values
2674 first since those will become the new manual values (which
2675 may be overwritten by explicit new values from this set
2676 of controls). */
2677 if (master->is_auto && master->has_volatiles &&
2678 !is_cur_manual(master)) {
2679 /* Pick an initial non-manual value */
2680 s32 new_auto_val = master->manual_mode_value + 1;
2681 u32 tmp_idx = idx;
2682
2683 do {
2684 /* Check if the auto control is part of the
2685 list, and remember the new value. */
2686 if (helpers[tmp_idx].ctrl == master)
2687 new_auto_val = cs->controls[tmp_idx].value;
2688 tmp_idx = helpers[tmp_idx].next;
2689 } while (tmp_idx);
2690 /* If the new value == the manual value, then copy
2691 the current volatile values. */
2692 if (new_auto_val == master->manual_mode_value)
2693 update_from_auto_cluster(master);
2694 }
2695
2696 /* Copy the new caller-supplied control values.
2697 user_to_new() sets 'is_new' to 1. */
2698 do {
2699 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2700 idx = helpers[idx].next;
2701 } while (!ret && idx);
2702
2703 if (!ret)
2704 ret = try_or_set_cluster(fh, master, set, 0);
2705
2706 /* Copy the new values back to userspace. */
2707 if (!ret) {
2708 idx = i;
2709 do {
2710 ret = new_to_user(cs->controls + idx,
2711 helpers[idx].ctrl);
2712 idx = helpers[idx].next;
2713 } while (!ret && idx);
2714 }
2715 v4l2_ctrl_unlock(master);
2716 }
2717
2718 if (cs->count > ARRAY_SIZE(helper))
2719 kfree(helpers);
2720 return ret;
2721 }
2722
2723 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2724 {
2725 return try_set_ext_ctrls(NULL, hdl, cs, false);
2726 }
2727 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2728
2729 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2730 struct v4l2_ext_controls *cs)
2731 {
2732 return try_set_ext_ctrls(fh, hdl, cs, true);
2733 }
2734 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2735
2736 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2737 {
2738 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2739 }
2740 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2741
2742 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2743 {
2744 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2745 }
2746 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2747
2748 /* Helper function for VIDIOC_S_CTRL compatibility */
2749 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2750 struct v4l2_ext_control *c, u32 ch_flags)
2751 {
2752 struct v4l2_ctrl *master = ctrl->cluster[0];
2753 int i;
2754
2755 /* String controls are not supported. The user_to_new() and
2756 * cur_to_user() calls below would need to be modified not to access
2757 * userspace memory when called from set_ctrl().
2758 */
2759 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2760 return -EINVAL;
2761
2762 /* Reset the 'is_new' flags of the cluster */
2763 for (i = 0; i < master->ncontrols; i++)
2764 if (master->cluster[i])
2765 master->cluster[i]->is_new = 0;
2766
2767 /* For autoclusters with volatiles that are switched from auto to
2768 manual mode we have to update the current volatile values since
2769 those will become the initial manual values after such a switch. */
2770 if (master->is_auto && master->has_volatiles && ctrl == master &&
2771 !is_cur_manual(master) && c->value == master->manual_mode_value)
2772 update_from_auto_cluster(master);
2773
2774 user_to_new(c, ctrl);
2775 return try_or_set_cluster(fh, master, true, ch_flags);
2776 }
2777
2778 /* Helper function for VIDIOC_S_CTRL compatibility */
2779 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2780 struct v4l2_ext_control *c)
2781 {
2782 int ret = validate_new(ctrl, c);
2783
2784 if (!ret) {
2785 v4l2_ctrl_lock(ctrl);
2786 ret = set_ctrl(fh, ctrl, c, 0);
2787 if (!ret)
2788 cur_to_user(c, ctrl);
2789 v4l2_ctrl_unlock(ctrl);
2790 }
2791 return ret;
2792 }
2793
2794 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2795 struct v4l2_control *control)
2796 {
2797 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2798 struct v4l2_ext_control c;
2799 int ret;
2800
2801 if (ctrl == NULL || !type_is_int(ctrl))
2802 return -EINVAL;
2803
2804 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2805 return -EACCES;
2806
2807 c.value = control->value;
2808 ret = set_ctrl_lock(fh, ctrl, &c);
2809 control->value = c.value;
2810 return ret;
2811 }
2812 EXPORT_SYMBOL(v4l2_s_ctrl);
2813
2814 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2815 {
2816 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2817 }
2818 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2819
2820 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2821 {
2822 struct v4l2_ext_control c;
2823
2824 /* It's a driver bug if this happens. */
2825 WARN_ON(!type_is_int(ctrl));
2826 c.value = val;
2827 return set_ctrl_lock(NULL, ctrl, &c);
2828 }
2829 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2830
2831 int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
2832 {
2833 struct v4l2_ext_control c;
2834
2835 /* It's a driver bug if this happens. */
2836 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2837 c.value64 = val;
2838 return set_ctrl_lock(NULL, ctrl, &c);
2839 }
2840 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
2841
2842 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
2843 {
2844 if (ctrl == NULL)
2845 return;
2846 if (notify == NULL) {
2847 ctrl->call_notify = 0;
2848 return;
2849 }
2850 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
2851 return;
2852 ctrl->handler->notify = notify;
2853 ctrl->handler->notify_priv = priv;
2854 ctrl->call_notify = 1;
2855 }
2856 EXPORT_SYMBOL(v4l2_ctrl_notify);
2857
2858 int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
2859 s32 min, s32 max, u32 step, s32 def)
2860 {
2861 int ret = check_range(ctrl->type, min, max, step, def);
2862 struct v4l2_ext_control c;
2863
2864 switch (ctrl->type) {
2865 case V4L2_CTRL_TYPE_INTEGER:
2866 case V4L2_CTRL_TYPE_BOOLEAN:
2867 case V4L2_CTRL_TYPE_MENU:
2868 case V4L2_CTRL_TYPE_INTEGER_MENU:
2869 case V4L2_CTRL_TYPE_BITMASK:
2870 if (ret)
2871 return ret;
2872 break;
2873 default:
2874 return -EINVAL;
2875 }
2876 v4l2_ctrl_lock(ctrl);
2877 ctrl->minimum = min;
2878 ctrl->maximum = max;
2879 ctrl->step = step;
2880 ctrl->default_value = def;
2881 c.value = ctrl->cur.val;
2882 if (validate_new(ctrl, &c))
2883 c.value = def;
2884 if (c.value != ctrl->cur.val)
2885 ret = set_ctrl(NULL, ctrl, &c, V4L2_EVENT_CTRL_CH_RANGE);
2886 else
2887 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
2888 v4l2_ctrl_unlock(ctrl);
2889 return ret;
2890 }
2891 EXPORT_SYMBOL(v4l2_ctrl_modify_range);
2892
2893 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
2894 {
2895 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2896
2897 if (ctrl == NULL)
2898 return -EINVAL;
2899
2900 v4l2_ctrl_lock(ctrl);
2901 list_add_tail(&sev->node, &ctrl->ev_subs);
2902 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2903 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2904 struct v4l2_event ev;
2905 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2906
2907 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2908 changes |= V4L2_EVENT_CTRL_CH_VALUE;
2909 fill_event(&ev, ctrl, changes);
2910 /* Mark the queue as active, allowing this initial
2911 event to be accepted. */
2912 sev->elems = elems;
2913 v4l2_event_queue_fh(sev->fh, &ev);
2914 }
2915 v4l2_ctrl_unlock(ctrl);
2916 return 0;
2917 }
2918
2919 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
2920 {
2921 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2922
2923 v4l2_ctrl_lock(ctrl);
2924 list_del(&sev->node);
2925 v4l2_ctrl_unlock(ctrl);
2926 }
2927
2928 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
2929 {
2930 u32 old_changes = old->u.ctrl.changes;
2931
2932 old->u.ctrl = new->u.ctrl;
2933 old->u.ctrl.changes |= old_changes;
2934 }
2935 EXPORT_SYMBOL(v4l2_ctrl_replace);
2936
2937 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
2938 {
2939 new->u.ctrl.changes |= old->u.ctrl.changes;
2940 }
2941 EXPORT_SYMBOL(v4l2_ctrl_merge);
2942
2943 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
2944 .add = v4l2_ctrl_add_event,
2945 .del = v4l2_ctrl_del_event,
2946 .replace = v4l2_ctrl_replace,
2947 .merge = v4l2_ctrl_merge,
2948 };
2949 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
2950
2951 int v4l2_ctrl_log_status(struct file *file, void *fh)
2952 {
2953 struct video_device *vfd = video_devdata(file);
2954 struct v4l2_fh *vfh = file->private_data;
2955
2956 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
2957 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
2958 vfd->v4l2_dev->name);
2959 return 0;
2960 }
2961 EXPORT_SYMBOL(v4l2_ctrl_log_status);
2962
2963 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
2964 const struct v4l2_event_subscription *sub)
2965 {
2966 if (sub->type == V4L2_EVENT_CTRL)
2967 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
2968 return -EINVAL;
2969 }
2970 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
2971
2972 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
2973 struct v4l2_event_subscription *sub)
2974 {
2975 if (!sd->ctrl_handler)
2976 return -EINVAL;
2977 return v4l2_ctrl_subscribe_event(fh, sub);
2978 }
2979 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
2980
2981 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
2982 {
2983 struct v4l2_fh *fh = file->private_data;
2984
2985 if (v4l2_event_pending(fh))
2986 return POLLPRI;
2987 poll_wait(file, &fh->wait, wait);
2988 return 0;
2989 }
2990 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux with added FPC-III support