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1168f683fd48bf64ee70676524c2aa72c7b5754d
[deliverable/linux.git] / drivers / media / v4l2-core / v4l2-ctrls.c
1 /*
2 V4L2 controls framework implementation.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/ctype.h>
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-event.h>
28 #include <media/v4l2-dev.h>
29
30 #define has_op(master, op) \
31 (master->ops && master->ops->op)
32 #define call_op(master, op) \
33 (has_op(master, op) ? master->ops->op(master) : 0)
34
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl *ctrl;
41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
43 u32 next;
44 };
45
46 /* Small helper function to determine if the autocluster is set to manual
47 mode. */
48 static bool is_cur_manual(const struct v4l2_ctrl *master)
49 {
50 return master->is_auto && master->cur.val == master->manual_mode_value;
51 }
52
53 /* Same as above, but this checks the against the new value instead of the
54 current value. */
55 static bool is_new_manual(const struct v4l2_ctrl *master)
56 {
57 return master->is_auto && master->val == master->manual_mode_value;
58 }
59
60 /* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
64 const char * const *v4l2_ctrl_get_menu(u32 id)
65 {
66 static const char * const mpeg_audio_sampling_freq[] = {
67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
72 static const char * const mpeg_audio_encoding[] = {
73 "MPEG-1/2 Layer I",
74 "MPEG-1/2 Layer II",
75 "MPEG-1/2 Layer III",
76 "MPEG-2/4 AAC",
77 "AC-3",
78 NULL
79 };
80 static const char * const mpeg_audio_l1_bitrate[] = {
81 "32 kbps",
82 "64 kbps",
83 "96 kbps",
84 "128 kbps",
85 "160 kbps",
86 "192 kbps",
87 "224 kbps",
88 "256 kbps",
89 "288 kbps",
90 "320 kbps",
91 "352 kbps",
92 "384 kbps",
93 "416 kbps",
94 "448 kbps",
95 NULL
96 };
97 static const char * const mpeg_audio_l2_bitrate[] = {
98 "32 kbps",
99 "48 kbps",
100 "56 kbps",
101 "64 kbps",
102 "80 kbps",
103 "96 kbps",
104 "112 kbps",
105 "128 kbps",
106 "160 kbps",
107 "192 kbps",
108 "224 kbps",
109 "256 kbps",
110 "320 kbps",
111 "384 kbps",
112 NULL
113 };
114 static const char * const mpeg_audio_l3_bitrate[] = {
115 "32 kbps",
116 "40 kbps",
117 "48 kbps",
118 "56 kbps",
119 "64 kbps",
120 "80 kbps",
121 "96 kbps",
122 "112 kbps",
123 "128 kbps",
124 "160 kbps",
125 "192 kbps",
126 "224 kbps",
127 "256 kbps",
128 "320 kbps",
129 NULL
130 };
131 static const char * const mpeg_audio_ac3_bitrate[] = {
132 "32 kbps",
133 "40 kbps",
134 "48 kbps",
135 "56 kbps",
136 "64 kbps",
137 "80 kbps",
138 "96 kbps",
139 "112 kbps",
140 "128 kbps",
141 "160 kbps",
142 "192 kbps",
143 "224 kbps",
144 "256 kbps",
145 "320 kbps",
146 "384 kbps",
147 "448 kbps",
148 "512 kbps",
149 "576 kbps",
150 "640 kbps",
151 NULL
152 };
153 static const char * const mpeg_audio_mode[] = {
154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
160 static const char * const mpeg_audio_mode_extension[] = {
161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
167 static const char * const mpeg_audio_emphasis[] = {
168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
173 static const char * const mpeg_audio_crc[] = {
174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
178 static const char * const mpeg_audio_dec_playback[] = {
179 "Auto",
180 "Stereo",
181 "Left",
182 "Right",
183 "Mono",
184 "Swapped Stereo",
185 NULL
186 };
187 static const char * const mpeg_video_encoding[] = {
188 "MPEG-1",
189 "MPEG-2",
190 "MPEG-4 AVC",
191 NULL
192 };
193 static const char * const mpeg_video_aspect[] = {
194 "1x1",
195 "4x3",
196 "16x9",
197 "2.21x1",
198 NULL
199 };
200 static const char * const mpeg_video_bitrate_mode[] = {
201 "Variable Bitrate",
202 "Constant Bitrate",
203 NULL
204 };
205 static const char * const mpeg_stream_type[] = {
206 "MPEG-2 Program Stream",
207 "MPEG-2 Transport Stream",
208 "MPEG-1 System Stream",
209 "MPEG-2 DVD-compatible Stream",
210 "MPEG-1 VCD-compatible Stream",
211 "MPEG-2 SVCD-compatible Stream",
212 NULL
213 };
214 static const char * const mpeg_stream_vbi_fmt[] = {
215 "No VBI",
216 "Private Packet, IVTV Format",
217 NULL
218 };
219 static const char * const camera_power_line_frequency[] = {
220 "Disabled",
221 "50 Hz",
222 "60 Hz",
223 "Auto",
224 NULL
225 };
226 static const char * const camera_exposure_auto[] = {
227 "Auto Mode",
228 "Manual Mode",
229 "Shutter Priority Mode",
230 "Aperture Priority Mode",
231 NULL
232 };
233 static const char * const camera_exposure_metering[] = {
234 "Average",
235 "Center Weighted",
236 "Spot",
237 "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_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
739 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
740 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
741
742 /* VPX controls */
743 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
744 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
745 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
746 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
747 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
748 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
749 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
750 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
751 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
752 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
753 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
754 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
755
756 /* CAMERA controls */
757 /* Keep the order of the 'case's the same as in videodev2.h! */
758 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
759 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
760 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
761 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
762 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
763 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
764 case V4L2_CID_PAN_RESET: return "Pan, Reset";
765 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
766 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
767 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
768 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
769 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
770 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
771 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
772 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
773 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
774 case V4L2_CID_PRIVACY: return "Privacy";
775 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
776 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
777 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
778 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
779 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
780 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
781 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
782 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
783 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
784 case V4L2_CID_SCENE_MODE: return "Scene Mode";
785 case V4L2_CID_3A_LOCK: return "3A Lock";
786 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
787 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
788 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
789 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
790
791 /* FM Radio Modulator control */
792 /* Keep the order of the 'case's the same as in videodev2.h! */
793 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
794 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
795 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
796 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
797 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
798 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
799 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
800 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
801 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
802 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
803 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
804 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
805 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
806 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
807 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
808 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
809 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
810 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
811 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
812 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
813
814 /* Flash controls */
815 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
816 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
817 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
818 case V4L2_CID_FLASH_STROBE: return "Strobe";
819 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
820 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
821 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
822 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
823 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
824 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
825 case V4L2_CID_FLASH_FAULT: return "Faults";
826 case V4L2_CID_FLASH_CHARGE: return "Charge";
827 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
828
829 /* JPEG encoder controls */
830 /* Keep the order of the 'case's the same as in videodev2.h! */
831 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
832 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
833 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
834 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
835 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
836
837 /* Image source controls */
838 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
839 case V4L2_CID_VBLANK: return "Vertical Blanking";
840 case V4L2_CID_HBLANK: return "Horizontal Blanking";
841 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
842
843 /* Image processing controls */
844 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
845 case V4L2_CID_LINK_FREQ: return "Link Frequency";
846 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
847 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
848
849 /* DV controls */
850 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
851 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
852 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
853 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
854 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
855 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
856 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
857 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
858
859 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
860 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
861 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
862
863 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
864 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
865 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
866 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
867 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
868 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
869 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
870 default:
871 return NULL;
872 }
873 }
874 EXPORT_SYMBOL(v4l2_ctrl_get_name);
875
876 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
877 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
878 {
879 *name = v4l2_ctrl_get_name(id);
880 *flags = 0;
881
882 switch (id) {
883 case V4L2_CID_AUDIO_MUTE:
884 case V4L2_CID_AUDIO_LOUDNESS:
885 case V4L2_CID_AUTO_WHITE_BALANCE:
886 case V4L2_CID_AUTOGAIN:
887 case V4L2_CID_HFLIP:
888 case V4L2_CID_VFLIP:
889 case V4L2_CID_HUE_AUTO:
890 case V4L2_CID_CHROMA_AGC:
891 case V4L2_CID_COLOR_KILLER:
892 case V4L2_CID_AUTOBRIGHTNESS:
893 case V4L2_CID_MPEG_AUDIO_MUTE:
894 case V4L2_CID_MPEG_VIDEO_MUTE:
895 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
896 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
897 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
898 case V4L2_CID_FOCUS_AUTO:
899 case V4L2_CID_PRIVACY:
900 case V4L2_CID_AUDIO_LIMITER_ENABLED:
901 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
902 case V4L2_CID_PILOT_TONE_ENABLED:
903 case V4L2_CID_ILLUMINATORS_1:
904 case V4L2_CID_ILLUMINATORS_2:
905 case V4L2_CID_FLASH_STROBE_STATUS:
906 case V4L2_CID_FLASH_CHARGE:
907 case V4L2_CID_FLASH_READY:
908 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
909 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
910 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
911 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
912 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
913 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
914 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
915 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
916 case V4L2_CID_WIDE_DYNAMIC_RANGE:
917 case V4L2_CID_IMAGE_STABILIZATION:
918 case V4L2_CID_RDS_RECEPTION:
919 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
920 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
921 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
922 *type = V4L2_CTRL_TYPE_BOOLEAN;
923 *min = 0;
924 *max = *step = 1;
925 break;
926 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
927 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
928 *type = V4L2_CTRL_TYPE_INTEGER;
929 break;
930 case V4L2_CID_PAN_RESET:
931 case V4L2_CID_TILT_RESET:
932 case V4L2_CID_FLASH_STROBE:
933 case V4L2_CID_FLASH_STROBE_STOP:
934 case V4L2_CID_AUTO_FOCUS_START:
935 case V4L2_CID_AUTO_FOCUS_STOP:
936 *type = V4L2_CTRL_TYPE_BUTTON;
937 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
938 *min = *max = *step = *def = 0;
939 break;
940 case V4L2_CID_POWER_LINE_FREQUENCY:
941 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
942 case V4L2_CID_MPEG_AUDIO_ENCODING:
943 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
944 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
945 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
946 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
947 case V4L2_CID_MPEG_AUDIO_MODE:
948 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
949 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
950 case V4L2_CID_MPEG_AUDIO_CRC:
951 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
952 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
953 case V4L2_CID_MPEG_VIDEO_ENCODING:
954 case V4L2_CID_MPEG_VIDEO_ASPECT:
955 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
956 case V4L2_CID_MPEG_STREAM_TYPE:
957 case V4L2_CID_MPEG_STREAM_VBI_FMT:
958 case V4L2_CID_EXPOSURE_AUTO:
959 case V4L2_CID_AUTO_FOCUS_RANGE:
960 case V4L2_CID_COLORFX:
961 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
962 case V4L2_CID_TUNE_PREEMPHASIS:
963 case V4L2_CID_FLASH_LED_MODE:
964 case V4L2_CID_FLASH_STROBE_SOURCE:
965 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
966 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
967 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
968 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
969 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
970 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
971 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
972 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
973 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
974 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
975 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
976 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
977 case V4L2_CID_ISO_SENSITIVITY_AUTO:
978 case V4L2_CID_EXPOSURE_METERING:
979 case V4L2_CID_SCENE_MODE:
980 case V4L2_CID_DV_TX_MODE:
981 case V4L2_CID_DV_TX_RGB_RANGE:
982 case V4L2_CID_DV_RX_RGB_RANGE:
983 case V4L2_CID_TEST_PATTERN:
984 case V4L2_CID_TUNE_DEEMPHASIS:
985 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
986 *type = V4L2_CTRL_TYPE_MENU;
987 break;
988 case V4L2_CID_LINK_FREQ:
989 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
990 break;
991 case V4L2_CID_RDS_TX_PS_NAME:
992 case V4L2_CID_RDS_TX_RADIO_TEXT:
993 *type = V4L2_CTRL_TYPE_STRING;
994 break;
995 case V4L2_CID_ISO_SENSITIVITY:
996 case V4L2_CID_AUTO_EXPOSURE_BIAS:
997 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
998 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
999 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1000 break;
1001 case V4L2_CID_USER_CLASS:
1002 case V4L2_CID_CAMERA_CLASS:
1003 case V4L2_CID_MPEG_CLASS:
1004 case V4L2_CID_FM_TX_CLASS:
1005 case V4L2_CID_FLASH_CLASS:
1006 case V4L2_CID_JPEG_CLASS:
1007 case V4L2_CID_IMAGE_SOURCE_CLASS:
1008 case V4L2_CID_IMAGE_PROC_CLASS:
1009 case V4L2_CID_DV_CLASS:
1010 case V4L2_CID_FM_RX_CLASS:
1011 case V4L2_CID_RF_TUNER_CLASS:
1012 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1013 /* You can neither read not write these */
1014 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1015 *min = *max = *step = *def = 0;
1016 break;
1017 case V4L2_CID_BG_COLOR:
1018 *type = V4L2_CTRL_TYPE_INTEGER;
1019 *step = 1;
1020 *min = 0;
1021 /* Max is calculated as RGB888 that is 2^24 */
1022 *max = 0xFFFFFF;
1023 break;
1024 case V4L2_CID_FLASH_FAULT:
1025 case V4L2_CID_JPEG_ACTIVE_MARKER:
1026 case V4L2_CID_3A_LOCK:
1027 case V4L2_CID_AUTO_FOCUS_STATUS:
1028 case V4L2_CID_DV_TX_HOTPLUG:
1029 case V4L2_CID_DV_TX_RXSENSE:
1030 case V4L2_CID_DV_TX_EDID_PRESENT:
1031 case V4L2_CID_DV_RX_POWER_PRESENT:
1032 *type = V4L2_CTRL_TYPE_BITMASK;
1033 break;
1034 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1035 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1036 *type = V4L2_CTRL_TYPE_INTEGER;
1037 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1038 break;
1039 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1040 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1041 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1042 /* Fall through */
1043 case V4L2_CID_PIXEL_RATE:
1044 *type = V4L2_CTRL_TYPE_INTEGER64;
1045 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1046 *min = *max = *step = *def = 0;
1047 break;
1048 default:
1049 *type = V4L2_CTRL_TYPE_INTEGER;
1050 break;
1051 }
1052 switch (id) {
1053 case V4L2_CID_MPEG_AUDIO_ENCODING:
1054 case V4L2_CID_MPEG_AUDIO_MODE:
1055 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1056 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1057 case V4L2_CID_MPEG_STREAM_TYPE:
1058 *flags |= V4L2_CTRL_FLAG_UPDATE;
1059 break;
1060 case V4L2_CID_AUDIO_VOLUME:
1061 case V4L2_CID_AUDIO_BALANCE:
1062 case V4L2_CID_AUDIO_BASS:
1063 case V4L2_CID_AUDIO_TREBLE:
1064 case V4L2_CID_BRIGHTNESS:
1065 case V4L2_CID_CONTRAST:
1066 case V4L2_CID_SATURATION:
1067 case V4L2_CID_HUE:
1068 case V4L2_CID_RED_BALANCE:
1069 case V4L2_CID_BLUE_BALANCE:
1070 case V4L2_CID_GAMMA:
1071 case V4L2_CID_SHARPNESS:
1072 case V4L2_CID_CHROMA_GAIN:
1073 case V4L2_CID_RDS_TX_DEVIATION:
1074 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1075 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1076 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1077 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1078 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1079 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1080 case V4L2_CID_PILOT_TONE_DEVIATION:
1081 case V4L2_CID_PILOT_TONE_FREQUENCY:
1082 case V4L2_CID_TUNE_POWER_LEVEL:
1083 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1084 case V4L2_CID_RF_TUNER_LNA_GAIN:
1085 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1086 case V4L2_CID_RF_TUNER_IF_GAIN:
1087 *flags |= V4L2_CTRL_FLAG_SLIDER;
1088 break;
1089 case V4L2_CID_PAN_RELATIVE:
1090 case V4L2_CID_TILT_RELATIVE:
1091 case V4L2_CID_FOCUS_RELATIVE:
1092 case V4L2_CID_IRIS_RELATIVE:
1093 case V4L2_CID_ZOOM_RELATIVE:
1094 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1095 break;
1096 case V4L2_CID_FLASH_STROBE_STATUS:
1097 case V4L2_CID_AUTO_FOCUS_STATUS:
1098 case V4L2_CID_FLASH_READY:
1099 case V4L2_CID_DV_TX_HOTPLUG:
1100 case V4L2_CID_DV_TX_RXSENSE:
1101 case V4L2_CID_DV_TX_EDID_PRESENT:
1102 case V4L2_CID_DV_RX_POWER_PRESENT:
1103 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1104 break;
1105 }
1106 }
1107 EXPORT_SYMBOL(v4l2_ctrl_fill);
1108
1109 /* Helper function to determine whether the control type is compatible with
1110 VIDIOC_G/S_CTRL. */
1111 static bool type_is_int(const struct v4l2_ctrl *ctrl)
1112 {
1113 switch (ctrl->type) {
1114 case V4L2_CTRL_TYPE_INTEGER64:
1115 case V4L2_CTRL_TYPE_STRING:
1116 /* Nope, these need v4l2_ext_control */
1117 return false;
1118 default:
1119 return true;
1120 }
1121 }
1122
1123 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1124 {
1125 memset(ev->reserved, 0, sizeof(ev->reserved));
1126 ev->type = V4L2_EVENT_CTRL;
1127 ev->id = ctrl->id;
1128 ev->u.ctrl.changes = changes;
1129 ev->u.ctrl.type = ctrl->type;
1130 ev->u.ctrl.flags = ctrl->flags;
1131 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
1132 ev->u.ctrl.value64 = 0;
1133 else
1134 ev->u.ctrl.value64 = ctrl->cur.val64;
1135 ev->u.ctrl.minimum = ctrl->minimum;
1136 ev->u.ctrl.maximum = ctrl->maximum;
1137 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1138 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1139 ev->u.ctrl.step = 1;
1140 else
1141 ev->u.ctrl.step = ctrl->step;
1142 ev->u.ctrl.default_value = ctrl->default_value;
1143 }
1144
1145 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1146 {
1147 struct v4l2_event ev;
1148 struct v4l2_subscribed_event *sev;
1149
1150 if (list_empty(&ctrl->ev_subs))
1151 return;
1152 fill_event(&ev, ctrl, changes);
1153
1154 list_for_each_entry(sev, &ctrl->ev_subs, node)
1155 if (sev->fh != fh ||
1156 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1157 v4l2_event_queue_fh(sev->fh, &ev);
1158 }
1159
1160 /* Helper function: copy the current control value back to the caller */
1161 static int cur_to_user(struct v4l2_ext_control *c,
1162 struct v4l2_ctrl *ctrl)
1163 {
1164 u32 len;
1165
1166 switch (ctrl->type) {
1167 case V4L2_CTRL_TYPE_STRING:
1168 len = strlen(ctrl->cur.string);
1169 if (c->size < len + 1) {
1170 c->size = len + 1;
1171 return -ENOSPC;
1172 }
1173 return copy_to_user(c->string, ctrl->cur.string,
1174 len + 1) ? -EFAULT : 0;
1175 case V4L2_CTRL_TYPE_INTEGER64:
1176 c->value64 = ctrl->cur.val64;
1177 break;
1178 default:
1179 c->value = ctrl->cur.val;
1180 break;
1181 }
1182 return 0;
1183 }
1184
1185 /* Helper function: copy the caller-provider value as the new control value */
1186 static int user_to_new(struct v4l2_ext_control *c,
1187 struct v4l2_ctrl *ctrl)
1188 {
1189 int ret;
1190 u32 size;
1191
1192 ctrl->is_new = 1;
1193 switch (ctrl->type) {
1194 case V4L2_CTRL_TYPE_INTEGER64:
1195 ctrl->val64 = c->value64;
1196 break;
1197 case V4L2_CTRL_TYPE_STRING:
1198 size = c->size;
1199 if (size == 0)
1200 return -ERANGE;
1201 if (size > ctrl->maximum + 1)
1202 size = ctrl->maximum + 1;
1203 ret = copy_from_user(ctrl->string, c->string, size);
1204 if (!ret) {
1205 char last = ctrl->string[size - 1];
1206
1207 ctrl->string[size - 1] = 0;
1208 /* If the string was longer than ctrl->maximum,
1209 then return an error. */
1210 if (strlen(ctrl->string) == ctrl->maximum && last)
1211 return -ERANGE;
1212 }
1213 return ret ? -EFAULT : 0;
1214 default:
1215 ctrl->val = c->value;
1216 break;
1217 }
1218 return 0;
1219 }
1220
1221 /* Helper function: copy the new control value back to the caller */
1222 static int new_to_user(struct v4l2_ext_control *c,
1223 struct v4l2_ctrl *ctrl)
1224 {
1225 u32 len;
1226
1227 switch (ctrl->type) {
1228 case V4L2_CTRL_TYPE_STRING:
1229 len = strlen(ctrl->string);
1230 if (c->size < len + 1) {
1231 c->size = ctrl->maximum + 1;
1232 return -ENOSPC;
1233 }
1234 return copy_to_user(c->string, ctrl->string,
1235 len + 1) ? -EFAULT : 0;
1236 case V4L2_CTRL_TYPE_INTEGER64:
1237 c->value64 = ctrl->val64;
1238 break;
1239 default:
1240 c->value = ctrl->val;
1241 break;
1242 }
1243 return 0;
1244 }
1245
1246 /* Copy the new value to the current value. */
1247 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1248 {
1249 bool changed = false;
1250
1251 if (ctrl == NULL)
1252 return;
1253 switch (ctrl->type) {
1254 case V4L2_CTRL_TYPE_BUTTON:
1255 changed = true;
1256 break;
1257 case V4L2_CTRL_TYPE_STRING:
1258 /* strings are always 0-terminated */
1259 changed = strcmp(ctrl->string, ctrl->cur.string);
1260 strcpy(ctrl->cur.string, ctrl->string);
1261 break;
1262 case V4L2_CTRL_TYPE_INTEGER64:
1263 changed = ctrl->val64 != ctrl->cur.val64;
1264 ctrl->cur.val64 = ctrl->val64;
1265 break;
1266 default:
1267 changed = ctrl->val != ctrl->cur.val;
1268 ctrl->cur.val = ctrl->val;
1269 break;
1270 }
1271 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1272 /* Note: CH_FLAGS is only set for auto clusters. */
1273 ctrl->flags &=
1274 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1275 if (!is_cur_manual(ctrl->cluster[0])) {
1276 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1277 if (ctrl->cluster[0]->has_volatiles)
1278 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1279 }
1280 fh = NULL;
1281 }
1282 if (changed || ch_flags) {
1283 /* If a control was changed that was not one of the controls
1284 modified by the application, then send the event to all. */
1285 if (!ctrl->is_new)
1286 fh = NULL;
1287 send_event(fh, ctrl,
1288 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1289 if (ctrl->call_notify && changed && ctrl->handler->notify)
1290 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1291 }
1292 }
1293
1294 /* Copy the current value to the new value */
1295 static void cur_to_new(struct v4l2_ctrl *ctrl)
1296 {
1297 if (ctrl == NULL)
1298 return;
1299 switch (ctrl->type) {
1300 case V4L2_CTRL_TYPE_STRING:
1301 /* strings are always 0-terminated */
1302 strcpy(ctrl->string, ctrl->cur.string);
1303 break;
1304 case V4L2_CTRL_TYPE_INTEGER64:
1305 ctrl->val64 = ctrl->cur.val64;
1306 break;
1307 default:
1308 ctrl->val = ctrl->cur.val;
1309 break;
1310 }
1311 }
1312
1313 /* Return non-zero if one or more of the controls in the cluster has a new
1314 value that differs from the current value. */
1315 static int cluster_changed(struct v4l2_ctrl *master)
1316 {
1317 int diff = 0;
1318 int i;
1319
1320 for (i = 0; !diff && i < master->ncontrols; i++) {
1321 struct v4l2_ctrl *ctrl = master->cluster[i];
1322
1323 if (ctrl == NULL)
1324 continue;
1325 switch (ctrl->type) {
1326 case V4L2_CTRL_TYPE_BUTTON:
1327 /* Button controls are always 'different' */
1328 return 1;
1329 case V4L2_CTRL_TYPE_STRING:
1330 /* strings are always 0-terminated */
1331 diff = strcmp(ctrl->string, ctrl->cur.string);
1332 break;
1333 case V4L2_CTRL_TYPE_INTEGER64:
1334 diff = ctrl->val64 != ctrl->cur.val64;
1335 break;
1336 default:
1337 diff = ctrl->val != ctrl->cur.val;
1338 break;
1339 }
1340 }
1341 return diff;
1342 }
1343
1344 /* Control range checking */
1345 static int check_range(enum v4l2_ctrl_type type,
1346 s32 min, s32 max, u32 step, s32 def)
1347 {
1348 switch (type) {
1349 case V4L2_CTRL_TYPE_BOOLEAN:
1350 if (step != 1 || max > 1 || min < 0)
1351 return -ERANGE;
1352 /* fall through */
1353 case V4L2_CTRL_TYPE_INTEGER:
1354 if (step <= 0 || min > max || def < min || def > max)
1355 return -ERANGE;
1356 return 0;
1357 case V4L2_CTRL_TYPE_BITMASK:
1358 if (step || min || !max || (def & ~max))
1359 return -ERANGE;
1360 return 0;
1361 case V4L2_CTRL_TYPE_MENU:
1362 case V4L2_CTRL_TYPE_INTEGER_MENU:
1363 if (min > max || def < min || def > max)
1364 return -ERANGE;
1365 /* Note: step == menu_skip_mask for menu controls.
1366 So here we check if the default value is masked out. */
1367 if (step && ((1 << def) & step))
1368 return -EINVAL;
1369 return 0;
1370 case V4L2_CTRL_TYPE_STRING:
1371 if (min > max || min < 0 || step < 1 || def)
1372 return -ERANGE;
1373 return 0;
1374 default:
1375 return 0;
1376 }
1377 }
1378
1379 /* Validate a new control */
1380 static int validate_new(const struct v4l2_ctrl *ctrl,
1381 struct v4l2_ext_control *c)
1382 {
1383 size_t len;
1384 u32 offset;
1385 s32 val;
1386
1387 switch (ctrl->type) {
1388 case V4L2_CTRL_TYPE_INTEGER:
1389 /* Round towards the closest legal value */
1390 val = c->value + ctrl->step / 2;
1391 val = clamp(val, ctrl->minimum, ctrl->maximum);
1392 offset = val - ctrl->minimum;
1393 offset = ctrl->step * (offset / ctrl->step);
1394 c->value = ctrl->minimum + offset;
1395 return 0;
1396
1397 case V4L2_CTRL_TYPE_BOOLEAN:
1398 c->value = !!c->value;
1399 return 0;
1400
1401 case V4L2_CTRL_TYPE_MENU:
1402 case V4L2_CTRL_TYPE_INTEGER_MENU:
1403 if (c->value < ctrl->minimum || c->value > ctrl->maximum)
1404 return -ERANGE;
1405 if (ctrl->menu_skip_mask & (1 << c->value))
1406 return -EINVAL;
1407 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1408 ctrl->qmenu[c->value][0] == '\0')
1409 return -EINVAL;
1410 return 0;
1411
1412 case V4L2_CTRL_TYPE_BITMASK:
1413 c->value &= ctrl->maximum;
1414 return 0;
1415
1416 case V4L2_CTRL_TYPE_BUTTON:
1417 case V4L2_CTRL_TYPE_CTRL_CLASS:
1418 c->value = 0;
1419 return 0;
1420
1421 case V4L2_CTRL_TYPE_INTEGER64:
1422 return 0;
1423
1424 case V4L2_CTRL_TYPE_STRING:
1425 len = strlen(c->string);
1426 if (len < ctrl->minimum)
1427 return -ERANGE;
1428 if ((len - ctrl->minimum) % ctrl->step)
1429 return -ERANGE;
1430 return 0;
1431
1432 default:
1433 return -EINVAL;
1434 }
1435 }
1436
1437 static inline u32 node2id(struct list_head *node)
1438 {
1439 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1440 }
1441
1442 /* Set the handler's error code if it wasn't set earlier already */
1443 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1444 {
1445 if (hdl->error == 0)
1446 hdl->error = err;
1447 return err;
1448 }
1449
1450 /* Initialize the handler */
1451 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1452 unsigned nr_of_controls_hint,
1453 struct lock_class_key *key, const char *name)
1454 {
1455 hdl->lock = &hdl->_lock;
1456 mutex_init(hdl->lock);
1457 lockdep_set_class_and_name(hdl->lock, key, name);
1458 INIT_LIST_HEAD(&hdl->ctrls);
1459 INIT_LIST_HEAD(&hdl->ctrl_refs);
1460 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1461 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1462 GFP_KERNEL);
1463 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1464 return hdl->error;
1465 }
1466 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1467
1468 /* Free all controls and control refs */
1469 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1470 {
1471 struct v4l2_ctrl_ref *ref, *next_ref;
1472 struct v4l2_ctrl *ctrl, *next_ctrl;
1473 struct v4l2_subscribed_event *sev, *next_sev;
1474
1475 if (hdl == NULL || hdl->buckets == NULL)
1476 return;
1477
1478 mutex_lock(hdl->lock);
1479 /* Free all nodes */
1480 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1481 list_del(&ref->node);
1482 kfree(ref);
1483 }
1484 /* Free all controls owned by the handler */
1485 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1486 list_del(&ctrl->node);
1487 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1488 list_del(&sev->node);
1489 kfree(ctrl);
1490 }
1491 kfree(hdl->buckets);
1492 hdl->buckets = NULL;
1493 hdl->cached = NULL;
1494 hdl->error = 0;
1495 mutex_unlock(hdl->lock);
1496 }
1497 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1498
1499 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1500 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1501 with applications that do not use the NEXT_CTRL flag.
1502
1503 We just find the n-th private user control. It's O(N), but that should not
1504 be an issue in this particular case. */
1505 static struct v4l2_ctrl_ref *find_private_ref(
1506 struct v4l2_ctrl_handler *hdl, u32 id)
1507 {
1508 struct v4l2_ctrl_ref *ref;
1509
1510 id -= V4L2_CID_PRIVATE_BASE;
1511 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1512 /* Search for private user controls that are compatible with
1513 VIDIOC_G/S_CTRL. */
1514 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1515 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1516 if (!type_is_int(ref->ctrl))
1517 continue;
1518 if (id == 0)
1519 return ref;
1520 id--;
1521 }
1522 }
1523 return NULL;
1524 }
1525
1526 /* Find a control with the given ID. */
1527 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1528 {
1529 struct v4l2_ctrl_ref *ref;
1530 int bucket;
1531
1532 id &= V4L2_CTRL_ID_MASK;
1533
1534 /* Old-style private controls need special handling */
1535 if (id >= V4L2_CID_PRIVATE_BASE)
1536 return find_private_ref(hdl, id);
1537 bucket = id % hdl->nr_of_buckets;
1538
1539 /* Simple optimization: cache the last control found */
1540 if (hdl->cached && hdl->cached->ctrl->id == id)
1541 return hdl->cached;
1542
1543 /* Not in cache, search the hash */
1544 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1545 while (ref && ref->ctrl->id != id)
1546 ref = ref->next;
1547
1548 if (ref)
1549 hdl->cached = ref; /* cache it! */
1550 return ref;
1551 }
1552
1553 /* Find a control with the given ID. Take the handler's lock first. */
1554 static struct v4l2_ctrl_ref *find_ref_lock(
1555 struct v4l2_ctrl_handler *hdl, u32 id)
1556 {
1557 struct v4l2_ctrl_ref *ref = NULL;
1558
1559 if (hdl) {
1560 mutex_lock(hdl->lock);
1561 ref = find_ref(hdl, id);
1562 mutex_unlock(hdl->lock);
1563 }
1564 return ref;
1565 }
1566
1567 /* Find a control with the given ID. */
1568 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1569 {
1570 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1571
1572 return ref ? ref->ctrl : NULL;
1573 }
1574 EXPORT_SYMBOL(v4l2_ctrl_find);
1575
1576 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1577 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1578 struct v4l2_ctrl *ctrl)
1579 {
1580 struct v4l2_ctrl_ref *ref;
1581 struct v4l2_ctrl_ref *new_ref;
1582 u32 id = ctrl->id;
1583 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1584 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1585
1586 /* Automatically add the control class if it is not yet present. */
1587 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1588 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1589 return hdl->error;
1590
1591 if (hdl->error)
1592 return hdl->error;
1593
1594 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1595 if (!new_ref)
1596 return handler_set_err(hdl, -ENOMEM);
1597 new_ref->ctrl = ctrl;
1598 if (ctrl->handler == hdl) {
1599 /* By default each control starts in a cluster of its own.
1600 new_ref->ctrl is basically a cluster array with one
1601 element, so that's perfect to use as the cluster pointer.
1602 But only do this for the handler that owns the control. */
1603 ctrl->cluster = &new_ref->ctrl;
1604 ctrl->ncontrols = 1;
1605 }
1606
1607 INIT_LIST_HEAD(&new_ref->node);
1608
1609 mutex_lock(hdl->lock);
1610
1611 /* Add immediately at the end of the list if the list is empty, or if
1612 the last element in the list has a lower ID.
1613 This ensures that when elements are added in ascending order the
1614 insertion is an O(1) operation. */
1615 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1616 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1617 goto insert_in_hash;
1618 }
1619
1620 /* Find insert position in sorted list */
1621 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1622 if (ref->ctrl->id < id)
1623 continue;
1624 /* Don't add duplicates */
1625 if (ref->ctrl->id == id) {
1626 kfree(new_ref);
1627 goto unlock;
1628 }
1629 list_add(&new_ref->node, ref->node.prev);
1630 break;
1631 }
1632
1633 insert_in_hash:
1634 /* Insert the control node in the hash */
1635 new_ref->next = hdl->buckets[bucket];
1636 hdl->buckets[bucket] = new_ref;
1637
1638 unlock:
1639 mutex_unlock(hdl->lock);
1640 return 0;
1641 }
1642
1643 /* Add a new control */
1644 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1645 const struct v4l2_ctrl_ops *ops,
1646 u32 id, const char *name, enum v4l2_ctrl_type type,
1647 s32 min, s32 max, u32 step, s32 def,
1648 u32 flags, const char * const *qmenu,
1649 const s64 *qmenu_int, void *priv)
1650 {
1651 struct v4l2_ctrl *ctrl;
1652 unsigned sz_extra = 0;
1653 int err;
1654
1655 if (hdl->error)
1656 return NULL;
1657
1658 /* Sanity checks */
1659 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1660 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1661 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1662 handler_set_err(hdl, -ERANGE);
1663 return NULL;
1664 }
1665 err = check_range(type, min, max, step, def);
1666 if (err) {
1667 handler_set_err(hdl, err);
1668 return NULL;
1669 }
1670 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1671 handler_set_err(hdl, -ERANGE);
1672 return NULL;
1673 }
1674
1675 if (type == V4L2_CTRL_TYPE_BUTTON)
1676 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1677 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1678 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1679 else if (type == V4L2_CTRL_TYPE_STRING)
1680 sz_extra += 2 * (max + 1);
1681
1682 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1683 if (ctrl == NULL) {
1684 handler_set_err(hdl, -ENOMEM);
1685 return NULL;
1686 }
1687
1688 INIT_LIST_HEAD(&ctrl->node);
1689 INIT_LIST_HEAD(&ctrl->ev_subs);
1690 ctrl->handler = hdl;
1691 ctrl->ops = ops;
1692 ctrl->id = id;
1693 ctrl->name = name;
1694 ctrl->type = type;
1695 ctrl->flags = flags;
1696 ctrl->minimum = min;
1697 ctrl->maximum = max;
1698 ctrl->step = step;
1699 if (type == V4L2_CTRL_TYPE_MENU)
1700 ctrl->qmenu = qmenu;
1701 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1702 ctrl->qmenu_int = qmenu_int;
1703 ctrl->priv = priv;
1704 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1705
1706 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1707 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1708 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1709 if (ctrl->minimum)
1710 memset(ctrl->cur.string, ' ', ctrl->minimum);
1711 }
1712 if (handler_new_ref(hdl, ctrl)) {
1713 kfree(ctrl);
1714 return NULL;
1715 }
1716 mutex_lock(hdl->lock);
1717 list_add_tail(&ctrl->node, &hdl->ctrls);
1718 mutex_unlock(hdl->lock);
1719 return ctrl;
1720 }
1721
1722 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1723 const struct v4l2_ctrl_config *cfg, void *priv)
1724 {
1725 bool is_menu;
1726 struct v4l2_ctrl *ctrl;
1727 const char *name = cfg->name;
1728 const char * const *qmenu = cfg->qmenu;
1729 const s64 *qmenu_int = cfg->qmenu_int;
1730 enum v4l2_ctrl_type type = cfg->type;
1731 u32 flags = cfg->flags;
1732 s32 min = cfg->min;
1733 s32 max = cfg->max;
1734 u32 step = cfg->step;
1735 s32 def = cfg->def;
1736
1737 if (name == NULL)
1738 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1739 &def, &flags);
1740
1741 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
1742 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
1743 if (is_menu)
1744 WARN_ON(step);
1745 else
1746 WARN_ON(cfg->menu_skip_mask);
1747 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
1748 qmenu = v4l2_ctrl_get_menu(cfg->id);
1749 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
1750 qmenu_int == NULL) {
1751 handler_set_err(hdl, -EINVAL);
1752 return NULL;
1753 }
1754
1755 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1756 type, min, max,
1757 is_menu ? cfg->menu_skip_mask : step,
1758 def, flags, qmenu, qmenu_int, priv);
1759 if (ctrl)
1760 ctrl->is_private = cfg->is_private;
1761 return ctrl;
1762 }
1763 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1764
1765 /* Helper function for standard non-menu controls */
1766 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1767 const struct v4l2_ctrl_ops *ops,
1768 u32 id, s32 min, s32 max, u32 step, s32 def)
1769 {
1770 const char *name;
1771 enum v4l2_ctrl_type type;
1772 u32 flags;
1773
1774 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1775 if (type == V4L2_CTRL_TYPE_MENU
1776 || type == V4L2_CTRL_TYPE_INTEGER_MENU) {
1777 handler_set_err(hdl, -EINVAL);
1778 return NULL;
1779 }
1780 return v4l2_ctrl_new(hdl, ops, id, name, type,
1781 min, max, step, def, flags, NULL, NULL, NULL);
1782 }
1783 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1784
1785 /* Helper function for standard menu controls */
1786 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1787 const struct v4l2_ctrl_ops *ops,
1788 u32 id, s32 max, s32 mask, s32 def)
1789 {
1790 const char * const *qmenu = NULL;
1791 const s64 *qmenu_int = NULL;
1792 unsigned int qmenu_int_len = 0;
1793 const char *name;
1794 enum v4l2_ctrl_type type;
1795 s32 min;
1796 s32 step;
1797 u32 flags;
1798
1799 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1800
1801 if (type == V4L2_CTRL_TYPE_MENU)
1802 qmenu = v4l2_ctrl_get_menu(id);
1803 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1804 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
1805
1806 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
1807 handler_set_err(hdl, -EINVAL);
1808 return NULL;
1809 }
1810 return v4l2_ctrl_new(hdl, ops, id, name, type,
1811 0, max, mask, def, flags, qmenu, qmenu_int, NULL);
1812 }
1813 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1814
1815 /* Helper function for standard menu controls with driver defined menu */
1816 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
1817 const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
1818 s32 mask, s32 def, const char * const *qmenu)
1819 {
1820 enum v4l2_ctrl_type type;
1821 const char *name;
1822 u32 flags;
1823 s32 step;
1824 s32 min;
1825
1826 /* v4l2_ctrl_new_std_menu_items() should only be called for
1827 * standard controls without a standard menu.
1828 */
1829 if (v4l2_ctrl_get_menu(id)) {
1830 handler_set_err(hdl, -EINVAL);
1831 return NULL;
1832 }
1833
1834 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1835 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
1836 handler_set_err(hdl, -EINVAL);
1837 return NULL;
1838 }
1839 return v4l2_ctrl_new(hdl, ops, id, name, type, 0, max, mask, def,
1840 flags, qmenu, NULL, NULL);
1841
1842 }
1843 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
1844
1845 /* Helper function for standard integer menu controls */
1846 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
1847 const struct v4l2_ctrl_ops *ops,
1848 u32 id, s32 max, s32 def, const s64 *qmenu_int)
1849 {
1850 const char *name;
1851 enum v4l2_ctrl_type type;
1852 s32 min;
1853 s32 step;
1854 u32 flags;
1855
1856 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1857 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
1858 handler_set_err(hdl, -EINVAL);
1859 return NULL;
1860 }
1861 return v4l2_ctrl_new(hdl, ops, id, name, type,
1862 0, max, 0, def, flags, NULL, qmenu_int, NULL);
1863 }
1864 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
1865
1866 /* Add a control from another handler to this handler */
1867 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1868 struct v4l2_ctrl *ctrl)
1869 {
1870 if (hdl == NULL || hdl->error)
1871 return NULL;
1872 if (ctrl == NULL) {
1873 handler_set_err(hdl, -EINVAL);
1874 return NULL;
1875 }
1876 if (ctrl->handler == hdl)
1877 return ctrl;
1878 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1879 }
1880 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1881
1882 /* Add the controls from another handler to our own. */
1883 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1884 struct v4l2_ctrl_handler *add,
1885 bool (*filter)(const struct v4l2_ctrl *ctrl))
1886 {
1887 struct v4l2_ctrl_ref *ref;
1888 int ret = 0;
1889
1890 /* Do nothing if either handler is NULL or if they are the same */
1891 if (!hdl || !add || hdl == add)
1892 return 0;
1893 if (hdl->error)
1894 return hdl->error;
1895 mutex_lock(add->lock);
1896 list_for_each_entry(ref, &add->ctrl_refs, node) {
1897 struct v4l2_ctrl *ctrl = ref->ctrl;
1898
1899 /* Skip handler-private controls. */
1900 if (ctrl->is_private)
1901 continue;
1902 /* And control classes */
1903 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1904 continue;
1905 /* Filter any unwanted controls */
1906 if (filter && !filter(ctrl))
1907 continue;
1908 ret = handler_new_ref(hdl, ctrl);
1909 if (ret)
1910 break;
1911 }
1912 mutex_unlock(add->lock);
1913 return ret;
1914 }
1915 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1916
1917 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
1918 {
1919 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
1920 return true;
1921 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
1922 return true;
1923 switch (ctrl->id) {
1924 case V4L2_CID_AUDIO_MUTE:
1925 case V4L2_CID_AUDIO_VOLUME:
1926 case V4L2_CID_AUDIO_BALANCE:
1927 case V4L2_CID_AUDIO_BASS:
1928 case V4L2_CID_AUDIO_TREBLE:
1929 case V4L2_CID_AUDIO_LOUDNESS:
1930 return true;
1931 default:
1932 break;
1933 }
1934 return false;
1935 }
1936 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
1937
1938 /* Cluster controls */
1939 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1940 {
1941 bool has_volatiles = false;
1942 int i;
1943
1944 /* The first control is the master control and it must not be NULL */
1945 BUG_ON(ncontrols == 0 || controls[0] == NULL);
1946
1947 for (i = 0; i < ncontrols; i++) {
1948 if (controls[i]) {
1949 controls[i]->cluster = controls;
1950 controls[i]->ncontrols = ncontrols;
1951 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1952 has_volatiles = true;
1953 }
1954 }
1955 controls[0]->has_volatiles = has_volatiles;
1956 }
1957 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1958
1959 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1960 u8 manual_val, bool set_volatile)
1961 {
1962 struct v4l2_ctrl *master = controls[0];
1963 u32 flag = 0;
1964 int i;
1965
1966 v4l2_ctrl_cluster(ncontrols, controls);
1967 WARN_ON(ncontrols <= 1);
1968 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1969 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1970 master->is_auto = true;
1971 master->has_volatiles = set_volatile;
1972 master->manual_mode_value = manual_val;
1973 master->flags |= V4L2_CTRL_FLAG_UPDATE;
1974
1975 if (!is_cur_manual(master))
1976 flag = V4L2_CTRL_FLAG_INACTIVE |
1977 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1978
1979 for (i = 1; i < ncontrols; i++)
1980 if (controls[i])
1981 controls[i]->flags |= flag;
1982 }
1983 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1984
1985 /* Activate/deactivate a control. */
1986 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1987 {
1988 /* invert since the actual flag is called 'inactive' */
1989 bool inactive = !active;
1990 bool old;
1991
1992 if (ctrl == NULL)
1993 return;
1994
1995 if (inactive)
1996 /* set V4L2_CTRL_FLAG_INACTIVE */
1997 old = test_and_set_bit(4, &ctrl->flags);
1998 else
1999 /* clear V4L2_CTRL_FLAG_INACTIVE */
2000 old = test_and_clear_bit(4, &ctrl->flags);
2001 if (old != inactive)
2002 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2003 }
2004 EXPORT_SYMBOL(v4l2_ctrl_activate);
2005
2006 /* Grab/ungrab a control.
2007 Typically used when streaming starts and you want to grab controls,
2008 preventing the user from changing them.
2009
2010 Just call this and the framework will block any attempts to change
2011 these controls. */
2012 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2013 {
2014 bool old;
2015
2016 if (ctrl == NULL)
2017 return;
2018
2019 v4l2_ctrl_lock(ctrl);
2020 if (grabbed)
2021 /* set V4L2_CTRL_FLAG_GRABBED */
2022 old = test_and_set_bit(1, &ctrl->flags);
2023 else
2024 /* clear V4L2_CTRL_FLAG_GRABBED */
2025 old = test_and_clear_bit(1, &ctrl->flags);
2026 if (old != grabbed)
2027 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2028 v4l2_ctrl_unlock(ctrl);
2029 }
2030 EXPORT_SYMBOL(v4l2_ctrl_grab);
2031
2032 /* Log the control name and value */
2033 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2034 const char *prefix, const char *colon)
2035 {
2036 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2037 return;
2038 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2039 return;
2040
2041 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
2042
2043 switch (ctrl->type) {
2044 case V4L2_CTRL_TYPE_INTEGER:
2045 printk(KERN_CONT "%d", ctrl->cur.val);
2046 break;
2047 case V4L2_CTRL_TYPE_BOOLEAN:
2048 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
2049 break;
2050 case V4L2_CTRL_TYPE_MENU:
2051 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
2052 break;
2053 case V4L2_CTRL_TYPE_INTEGER_MENU:
2054 printk(KERN_CONT "%lld", ctrl->qmenu_int[ctrl->cur.val]);
2055 break;
2056 case V4L2_CTRL_TYPE_BITMASK:
2057 printk(KERN_CONT "0x%08x", ctrl->cur.val);
2058 break;
2059 case V4L2_CTRL_TYPE_INTEGER64:
2060 printk(KERN_CONT "%lld", ctrl->cur.val64);
2061 break;
2062 case V4L2_CTRL_TYPE_STRING:
2063 printk(KERN_CONT "%s", ctrl->cur.string);
2064 break;
2065 default:
2066 printk(KERN_CONT "unknown type %d", ctrl->type);
2067 break;
2068 }
2069 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2070 V4L2_CTRL_FLAG_GRABBED |
2071 V4L2_CTRL_FLAG_VOLATILE)) {
2072 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2073 printk(KERN_CONT " inactive");
2074 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2075 printk(KERN_CONT " grabbed");
2076 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2077 printk(KERN_CONT " volatile");
2078 }
2079 printk(KERN_CONT "\n");
2080 }
2081
2082 /* Log all controls owned by the handler */
2083 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2084 const char *prefix)
2085 {
2086 struct v4l2_ctrl *ctrl;
2087 const char *colon = "";
2088 int len;
2089
2090 if (hdl == NULL)
2091 return;
2092 if (prefix == NULL)
2093 prefix = "";
2094 len = strlen(prefix);
2095 if (len && prefix[len - 1] != ' ')
2096 colon = ": ";
2097 mutex_lock(hdl->lock);
2098 list_for_each_entry(ctrl, &hdl->ctrls, node)
2099 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2100 log_ctrl(ctrl, prefix, colon);
2101 mutex_unlock(hdl->lock);
2102 }
2103 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2104
2105 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2106 {
2107 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2108 return 0;
2109 }
2110 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2111
2112 /* Call s_ctrl for all controls owned by the handler */
2113 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2114 {
2115 struct v4l2_ctrl *ctrl;
2116 int ret = 0;
2117
2118 if (hdl == NULL)
2119 return 0;
2120 mutex_lock(hdl->lock);
2121 list_for_each_entry(ctrl, &hdl->ctrls, node)
2122 ctrl->done = false;
2123
2124 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2125 struct v4l2_ctrl *master = ctrl->cluster[0];
2126 int i;
2127
2128 /* Skip if this control was already handled by a cluster. */
2129 /* Skip button controls and read-only controls. */
2130 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2131 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2132 continue;
2133
2134 for (i = 0; i < master->ncontrols; i++) {
2135 if (master->cluster[i]) {
2136 cur_to_new(master->cluster[i]);
2137 master->cluster[i]->is_new = 1;
2138 master->cluster[i]->done = true;
2139 }
2140 }
2141 ret = call_op(master, s_ctrl);
2142 if (ret)
2143 break;
2144 }
2145 mutex_unlock(hdl->lock);
2146 return ret;
2147 }
2148 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2149
2150 /* Implement VIDIOC_QUERYCTRL */
2151 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2152 {
2153 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2154 struct v4l2_ctrl_ref *ref;
2155 struct v4l2_ctrl *ctrl;
2156
2157 if (hdl == NULL)
2158 return -EINVAL;
2159
2160 mutex_lock(hdl->lock);
2161
2162 /* Try to find it */
2163 ref = find_ref(hdl, id);
2164
2165 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
2166 /* Find the next control with ID > qc->id */
2167
2168 /* Did we reach the end of the control list? */
2169 if (id >= node2id(hdl->ctrl_refs.prev)) {
2170 ref = NULL; /* Yes, so there is no next control */
2171 } else if (ref) {
2172 /* We found a control with the given ID, so just get
2173 the next one in the list. */
2174 ref = list_entry(ref->node.next, typeof(*ref), node);
2175 } else {
2176 /* No control with the given ID exists, so start
2177 searching for the next largest ID. We know there
2178 is one, otherwise the first 'if' above would have
2179 been true. */
2180 list_for_each_entry(ref, &hdl->ctrl_refs, node)
2181 if (id < ref->ctrl->id)
2182 break;
2183 }
2184 }
2185 mutex_unlock(hdl->lock);
2186 if (!ref)
2187 return -EINVAL;
2188
2189 ctrl = ref->ctrl;
2190 memset(qc, 0, sizeof(*qc));
2191 if (id >= V4L2_CID_PRIVATE_BASE)
2192 qc->id = id;
2193 else
2194 qc->id = ctrl->id;
2195 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2196 qc->minimum = ctrl->minimum;
2197 qc->maximum = ctrl->maximum;
2198 qc->default_value = ctrl->default_value;
2199 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2200 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2201 qc->step = 1;
2202 else
2203 qc->step = ctrl->step;
2204 qc->flags = ctrl->flags;
2205 qc->type = ctrl->type;
2206 return 0;
2207 }
2208 EXPORT_SYMBOL(v4l2_queryctrl);
2209
2210 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2211 {
2212 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
2213 return -EINVAL;
2214 return v4l2_queryctrl(sd->ctrl_handler, qc);
2215 }
2216 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2217
2218 /* Implement VIDIOC_QUERYMENU */
2219 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2220 {
2221 struct v4l2_ctrl *ctrl;
2222 u32 i = qm->index;
2223
2224 ctrl = v4l2_ctrl_find(hdl, qm->id);
2225 if (!ctrl)
2226 return -EINVAL;
2227
2228 qm->reserved = 0;
2229 /* Sanity checks */
2230 switch (ctrl->type) {
2231 case V4L2_CTRL_TYPE_MENU:
2232 if (ctrl->qmenu == NULL)
2233 return -EINVAL;
2234 break;
2235 case V4L2_CTRL_TYPE_INTEGER_MENU:
2236 if (ctrl->qmenu_int == NULL)
2237 return -EINVAL;
2238 break;
2239 default:
2240 return -EINVAL;
2241 }
2242
2243 if (i < ctrl->minimum || i > ctrl->maximum)
2244 return -EINVAL;
2245
2246 /* Use mask to see if this menu item should be skipped */
2247 if (ctrl->menu_skip_mask & (1 << i))
2248 return -EINVAL;
2249 /* Empty menu items should also be skipped */
2250 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2251 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2252 return -EINVAL;
2253 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2254 } else {
2255 qm->value = ctrl->qmenu_int[i];
2256 }
2257 return 0;
2258 }
2259 EXPORT_SYMBOL(v4l2_querymenu);
2260
2261 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2262 {
2263 return v4l2_querymenu(sd->ctrl_handler, qm);
2264 }
2265 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2266
2267
2268
2269 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2270
2271 It is not a fully atomic operation, just best-effort only. After all, if
2272 multiple controls have to be set through multiple i2c writes (for example)
2273 then some initial writes may succeed while others fail. Thus leaving the
2274 system in an inconsistent state. The question is how much effort you are
2275 willing to spend on trying to make something atomic that really isn't.
2276
2277 From the point of view of an application the main requirement is that
2278 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2279 error should be returned without actually affecting any controls.
2280
2281 If all the values are correct, then it is acceptable to just give up
2282 in case of low-level errors.
2283
2284 It is important though that the application can tell when only a partial
2285 configuration was done. The way we do that is through the error_idx field
2286 of struct v4l2_ext_controls: if that is equal to the count field then no
2287 controls were affected. Otherwise all controls before that index were
2288 successful in performing their 'get' or 'set' operation, the control at
2289 the given index failed, and you don't know what happened with the controls
2290 after the failed one. Since if they were part of a control cluster they
2291 could have been successfully processed (if a cluster member was encountered
2292 at index < error_idx), they could have failed (if a cluster member was at
2293 error_idx), or they may not have been processed yet (if the first cluster
2294 member appeared after error_idx).
2295
2296 It is all fairly theoretical, though. In practice all you can do is to
2297 bail out. If error_idx == count, then it is an application bug. If
2298 error_idx < count then it is only an application bug if the error code was
2299 EBUSY. That usually means that something started streaming just when you
2300 tried to set the controls. In all other cases it is a driver/hardware
2301 problem and all you can do is to retry or bail out.
2302
2303 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2304 never modifies controls the error_idx is just set to whatever control
2305 has an invalid value.
2306 */
2307
2308 /* Prepare for the extended g/s/try functions.
2309 Find the controls in the control array and do some basic checks. */
2310 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2311 struct v4l2_ext_controls *cs,
2312 struct v4l2_ctrl_helper *helpers)
2313 {
2314 struct v4l2_ctrl_helper *h;
2315 bool have_clusters = false;
2316 u32 i;
2317
2318 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2319 struct v4l2_ext_control *c = &cs->controls[i];
2320 struct v4l2_ctrl_ref *ref;
2321 struct v4l2_ctrl *ctrl;
2322 u32 id = c->id & V4L2_CTRL_ID_MASK;
2323
2324 cs->error_idx = i;
2325
2326 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2327 return -EINVAL;
2328
2329 /* Old-style private controls are not allowed for
2330 extended controls */
2331 if (id >= V4L2_CID_PRIVATE_BASE)
2332 return -EINVAL;
2333 ref = find_ref_lock(hdl, id);
2334 if (ref == NULL)
2335 return -EINVAL;
2336 ctrl = ref->ctrl;
2337 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2338 return -EINVAL;
2339
2340 if (ctrl->cluster[0]->ncontrols > 1)
2341 have_clusters = true;
2342 if (ctrl->cluster[0] != ctrl)
2343 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2344 /* Store the ref to the master control of the cluster */
2345 h->mref = ref;
2346 h->ctrl = ctrl;
2347 /* Initially set next to 0, meaning that there is no other
2348 control in this helper array belonging to the same
2349 cluster */
2350 h->next = 0;
2351 }
2352
2353 /* We are done if there were no controls that belong to a multi-
2354 control cluster. */
2355 if (!have_clusters)
2356 return 0;
2357
2358 /* The code below figures out in O(n) time which controls in the list
2359 belong to the same cluster. */
2360
2361 /* This has to be done with the handler lock taken. */
2362 mutex_lock(hdl->lock);
2363
2364 /* First zero the helper field in the master control references */
2365 for (i = 0; i < cs->count; i++)
2366 helpers[i].mref->helper = NULL;
2367 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2368 struct v4l2_ctrl_ref *mref = h->mref;
2369
2370 /* If the mref->helper is set, then it points to an earlier
2371 helper that belongs to the same cluster. */
2372 if (mref->helper) {
2373 /* Set the next field of mref->helper to the current
2374 index: this means that that earlier helper now
2375 points to the next helper in the same cluster. */
2376 mref->helper->next = i;
2377 /* mref should be set only for the first helper in the
2378 cluster, clear the others. */
2379 h->mref = NULL;
2380 }
2381 /* Point the mref helper to the current helper struct. */
2382 mref->helper = h;
2383 }
2384 mutex_unlock(hdl->lock);
2385 return 0;
2386 }
2387
2388 /* Handles the corner case where cs->count == 0. It checks whether the
2389 specified control class exists. If that class ID is 0, then it checks
2390 whether there are any controls at all. */
2391 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2392 {
2393 if (ctrl_class == 0)
2394 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2395 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2396 }
2397
2398
2399
2400 /* Get extended controls. Allocates the helpers array if needed. */
2401 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2402 {
2403 struct v4l2_ctrl_helper helper[4];
2404 struct v4l2_ctrl_helper *helpers = helper;
2405 int ret;
2406 int i, j;
2407
2408 cs->error_idx = cs->count;
2409 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2410
2411 if (hdl == NULL)
2412 return -EINVAL;
2413
2414 if (cs->count == 0)
2415 return class_check(hdl, cs->ctrl_class);
2416
2417 if (cs->count > ARRAY_SIZE(helper)) {
2418 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2419 GFP_KERNEL);
2420 if (helpers == NULL)
2421 return -ENOMEM;
2422 }
2423
2424 ret = prepare_ext_ctrls(hdl, cs, helpers);
2425 cs->error_idx = cs->count;
2426
2427 for (i = 0; !ret && i < cs->count; i++)
2428 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2429 ret = -EACCES;
2430
2431 for (i = 0; !ret && i < cs->count; i++) {
2432 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2433 struct v4l2_ctrl *ctrl) = cur_to_user;
2434 struct v4l2_ctrl *master;
2435
2436 if (helpers[i].mref == NULL)
2437 continue;
2438
2439 master = helpers[i].mref->ctrl;
2440 cs->error_idx = i;
2441
2442 v4l2_ctrl_lock(master);
2443
2444 /* g_volatile_ctrl will update the new control values */
2445 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2446 (master->has_volatiles && !is_cur_manual(master))) {
2447 for (j = 0; j < master->ncontrols; j++)
2448 cur_to_new(master->cluster[j]);
2449 ret = call_op(master, g_volatile_ctrl);
2450 ctrl_to_user = new_to_user;
2451 }
2452 /* If OK, then copy the current (for non-volatile controls)
2453 or the new (for volatile controls) control values to the
2454 caller */
2455 if (!ret) {
2456 u32 idx = i;
2457
2458 do {
2459 ret = ctrl_to_user(cs->controls + idx,
2460 helpers[idx].ctrl);
2461 idx = helpers[idx].next;
2462 } while (!ret && idx);
2463 }
2464 v4l2_ctrl_unlock(master);
2465 }
2466
2467 if (cs->count > ARRAY_SIZE(helper))
2468 kfree(helpers);
2469 return ret;
2470 }
2471 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2472
2473 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2474 {
2475 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2476 }
2477 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2478
2479 /* Helper function to get a single control */
2480 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2481 {
2482 struct v4l2_ctrl *master = ctrl->cluster[0];
2483 int ret = 0;
2484 int i;
2485
2486 /* String controls are not supported. The new_to_user() and
2487 * cur_to_user() calls below would need to be modified not to access
2488 * userspace memory when called from get_ctrl().
2489 */
2490 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2491 return -EINVAL;
2492
2493 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2494 return -EACCES;
2495
2496 v4l2_ctrl_lock(master);
2497 /* g_volatile_ctrl will update the current control values */
2498 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2499 for (i = 0; i < master->ncontrols; i++)
2500 cur_to_new(master->cluster[i]);
2501 ret = call_op(master, g_volatile_ctrl);
2502 new_to_user(c, ctrl);
2503 } else {
2504 cur_to_user(c, ctrl);
2505 }
2506 v4l2_ctrl_unlock(master);
2507 return ret;
2508 }
2509
2510 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2511 {
2512 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2513 struct v4l2_ext_control c;
2514 int ret;
2515
2516 if (ctrl == NULL || !type_is_int(ctrl))
2517 return -EINVAL;
2518 ret = get_ctrl(ctrl, &c);
2519 control->value = c.value;
2520 return ret;
2521 }
2522 EXPORT_SYMBOL(v4l2_g_ctrl);
2523
2524 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2525 {
2526 return v4l2_g_ctrl(sd->ctrl_handler, control);
2527 }
2528 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2529
2530 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2531 {
2532 struct v4l2_ext_control c;
2533
2534 /* It's a driver bug if this happens. */
2535 WARN_ON(!type_is_int(ctrl));
2536 c.value = 0;
2537 get_ctrl(ctrl, &c);
2538 return c.value;
2539 }
2540 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2541
2542 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2543 {
2544 struct v4l2_ext_control c;
2545
2546 /* It's a driver bug if this happens. */
2547 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2548 c.value = 0;
2549 get_ctrl(ctrl, &c);
2550 return c.value;
2551 }
2552 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2553
2554
2555 /* Core function that calls try/s_ctrl and ensures that the new value is
2556 copied to the current value on a set.
2557 Must be called with ctrl->handler->lock held. */
2558 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2559 bool set, u32 ch_flags)
2560 {
2561 bool update_flag;
2562 int ret;
2563 int i;
2564
2565 /* Go through the cluster and either validate the new value or
2566 (if no new value was set), copy the current value to the new
2567 value, ensuring a consistent view for the control ops when
2568 called. */
2569 for (i = 0; i < master->ncontrols; i++) {
2570 struct v4l2_ctrl *ctrl = master->cluster[i];
2571
2572 if (ctrl == NULL)
2573 continue;
2574
2575 if (!ctrl->is_new) {
2576 cur_to_new(ctrl);
2577 continue;
2578 }
2579 /* Check again: it may have changed since the
2580 previous check in try_or_set_ext_ctrls(). */
2581 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2582 return -EBUSY;
2583 }
2584
2585 ret = call_op(master, try_ctrl);
2586
2587 /* Don't set if there is no change */
2588 if (ret || !set || !cluster_changed(master))
2589 return ret;
2590 ret = call_op(master, s_ctrl);
2591 if (ret)
2592 return ret;
2593
2594 /* If OK, then make the new values permanent. */
2595 update_flag = is_cur_manual(master) != is_new_manual(master);
2596 for (i = 0; i < master->ncontrols; i++)
2597 new_to_cur(fh, master->cluster[i], ch_flags |
2598 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2599 return 0;
2600 }
2601
2602 /* Validate controls. */
2603 static int validate_ctrls(struct v4l2_ext_controls *cs,
2604 struct v4l2_ctrl_helper *helpers, bool set)
2605 {
2606 unsigned i;
2607 int ret = 0;
2608
2609 cs->error_idx = cs->count;
2610 for (i = 0; i < cs->count; i++) {
2611 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2612
2613 cs->error_idx = i;
2614
2615 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2616 return -EACCES;
2617 /* This test is also done in try_set_control_cluster() which
2618 is called in atomic context, so that has the final say,
2619 but it makes sense to do an up-front check as well. Once
2620 an error occurs in try_set_control_cluster() some other
2621 controls may have been set already and we want to do a
2622 best-effort to avoid that. */
2623 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2624 return -EBUSY;
2625 ret = validate_new(ctrl, &cs->controls[i]);
2626 if (ret)
2627 return ret;
2628 }
2629 return 0;
2630 }
2631
2632 /* Obtain the current volatile values of an autocluster and mark them
2633 as new. */
2634 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2635 {
2636 int i;
2637
2638 for (i = 0; i < master->ncontrols; i++)
2639 cur_to_new(master->cluster[i]);
2640 if (!call_op(master, g_volatile_ctrl))
2641 for (i = 1; i < master->ncontrols; i++)
2642 if (master->cluster[i])
2643 master->cluster[i]->is_new = 1;
2644 }
2645
2646 /* Try or try-and-set controls */
2647 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2648 struct v4l2_ext_controls *cs,
2649 bool set)
2650 {
2651 struct v4l2_ctrl_helper helper[4];
2652 struct v4l2_ctrl_helper *helpers = helper;
2653 unsigned i, j;
2654 int ret;
2655
2656 cs->error_idx = cs->count;
2657 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2658
2659 if (hdl == NULL)
2660 return -EINVAL;
2661
2662 if (cs->count == 0)
2663 return class_check(hdl, cs->ctrl_class);
2664
2665 if (cs->count > ARRAY_SIZE(helper)) {
2666 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2667 GFP_KERNEL);
2668 if (!helpers)
2669 return -ENOMEM;
2670 }
2671 ret = prepare_ext_ctrls(hdl, cs, helpers);
2672 if (!ret)
2673 ret = validate_ctrls(cs, helpers, set);
2674 if (ret && set)
2675 cs->error_idx = cs->count;
2676 for (i = 0; !ret && i < cs->count; i++) {
2677 struct v4l2_ctrl *master;
2678 u32 idx = i;
2679
2680 if (helpers[i].mref == NULL)
2681 continue;
2682
2683 cs->error_idx = i;
2684 master = helpers[i].mref->ctrl;
2685 v4l2_ctrl_lock(master);
2686
2687 /* Reset the 'is_new' flags of the cluster */
2688 for (j = 0; j < master->ncontrols; j++)
2689 if (master->cluster[j])
2690 master->cluster[j]->is_new = 0;
2691
2692 /* For volatile autoclusters that are currently in auto mode
2693 we need to discover if it will be set to manual mode.
2694 If so, then we have to copy the current volatile values
2695 first since those will become the new manual values (which
2696 may be overwritten by explicit new values from this set
2697 of controls). */
2698 if (master->is_auto && master->has_volatiles &&
2699 !is_cur_manual(master)) {
2700 /* Pick an initial non-manual value */
2701 s32 new_auto_val = master->manual_mode_value + 1;
2702 u32 tmp_idx = idx;
2703
2704 do {
2705 /* Check if the auto control is part of the
2706 list, and remember the new value. */
2707 if (helpers[tmp_idx].ctrl == master)
2708 new_auto_val = cs->controls[tmp_idx].value;
2709 tmp_idx = helpers[tmp_idx].next;
2710 } while (tmp_idx);
2711 /* If the new value == the manual value, then copy
2712 the current volatile values. */
2713 if (new_auto_val == master->manual_mode_value)
2714 update_from_auto_cluster(master);
2715 }
2716
2717 /* Copy the new caller-supplied control values.
2718 user_to_new() sets 'is_new' to 1. */
2719 do {
2720 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2721 idx = helpers[idx].next;
2722 } while (!ret && idx);
2723
2724 if (!ret)
2725 ret = try_or_set_cluster(fh, master, set, 0);
2726
2727 /* Copy the new values back to userspace. */
2728 if (!ret) {
2729 idx = i;
2730 do {
2731 ret = new_to_user(cs->controls + idx,
2732 helpers[idx].ctrl);
2733 idx = helpers[idx].next;
2734 } while (!ret && idx);
2735 }
2736 v4l2_ctrl_unlock(master);
2737 }
2738
2739 if (cs->count > ARRAY_SIZE(helper))
2740 kfree(helpers);
2741 return ret;
2742 }
2743
2744 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2745 {
2746 return try_set_ext_ctrls(NULL, hdl, cs, false);
2747 }
2748 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2749
2750 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2751 struct v4l2_ext_controls *cs)
2752 {
2753 return try_set_ext_ctrls(fh, hdl, cs, true);
2754 }
2755 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2756
2757 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2758 {
2759 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2760 }
2761 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2762
2763 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2764 {
2765 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2766 }
2767 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2768
2769 /* Helper function for VIDIOC_S_CTRL compatibility */
2770 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2771 struct v4l2_ext_control *c, u32 ch_flags)
2772 {
2773 struct v4l2_ctrl *master = ctrl->cluster[0];
2774 int i;
2775
2776 /* String controls are not supported. The user_to_new() and
2777 * cur_to_user() calls below would need to be modified not to access
2778 * userspace memory when called from set_ctrl().
2779 */
2780 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2781 return -EINVAL;
2782
2783 /* Reset the 'is_new' flags of the cluster */
2784 for (i = 0; i < master->ncontrols; i++)
2785 if (master->cluster[i])
2786 master->cluster[i]->is_new = 0;
2787
2788 /* For autoclusters with volatiles that are switched from auto to
2789 manual mode we have to update the current volatile values since
2790 those will become the initial manual values after such a switch. */
2791 if (master->is_auto && master->has_volatiles && ctrl == master &&
2792 !is_cur_manual(master) && c->value == master->manual_mode_value)
2793 update_from_auto_cluster(master);
2794
2795 user_to_new(c, ctrl);
2796 return try_or_set_cluster(fh, master, true, ch_flags);
2797 }
2798
2799 /* Helper function for VIDIOC_S_CTRL compatibility */
2800 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2801 struct v4l2_ext_control *c)
2802 {
2803 int ret = validate_new(ctrl, c);
2804
2805 if (!ret) {
2806 v4l2_ctrl_lock(ctrl);
2807 ret = set_ctrl(fh, ctrl, c, 0);
2808 if (!ret)
2809 cur_to_user(c, ctrl);
2810 v4l2_ctrl_unlock(ctrl);
2811 }
2812 return ret;
2813 }
2814
2815 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2816 struct v4l2_control *control)
2817 {
2818 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2819 struct v4l2_ext_control c;
2820 int ret;
2821
2822 if (ctrl == NULL || !type_is_int(ctrl))
2823 return -EINVAL;
2824
2825 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2826 return -EACCES;
2827
2828 c.value = control->value;
2829 ret = set_ctrl_lock(fh, ctrl, &c);
2830 control->value = c.value;
2831 return ret;
2832 }
2833 EXPORT_SYMBOL(v4l2_s_ctrl);
2834
2835 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2836 {
2837 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2838 }
2839 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2840
2841 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2842 {
2843 struct v4l2_ext_control c;
2844
2845 /* It's a driver bug if this happens. */
2846 WARN_ON(!type_is_int(ctrl));
2847 c.value = val;
2848 return set_ctrl_lock(NULL, ctrl, &c);
2849 }
2850 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2851
2852 int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
2853 {
2854 struct v4l2_ext_control c;
2855
2856 /* It's a driver bug if this happens. */
2857 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2858 c.value64 = val;
2859 return set_ctrl_lock(NULL, ctrl, &c);
2860 }
2861 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
2862
2863 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
2864 {
2865 if (ctrl == NULL)
2866 return;
2867 if (notify == NULL) {
2868 ctrl->call_notify = 0;
2869 return;
2870 }
2871 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
2872 return;
2873 ctrl->handler->notify = notify;
2874 ctrl->handler->notify_priv = priv;
2875 ctrl->call_notify = 1;
2876 }
2877 EXPORT_SYMBOL(v4l2_ctrl_notify);
2878
2879 int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
2880 s32 min, s32 max, u32 step, s32 def)
2881 {
2882 int ret = check_range(ctrl->type, min, max, step, def);
2883 struct v4l2_ext_control c;
2884
2885 switch (ctrl->type) {
2886 case V4L2_CTRL_TYPE_INTEGER:
2887 case V4L2_CTRL_TYPE_BOOLEAN:
2888 case V4L2_CTRL_TYPE_MENU:
2889 case V4L2_CTRL_TYPE_INTEGER_MENU:
2890 case V4L2_CTRL_TYPE_BITMASK:
2891 if (ret)
2892 return ret;
2893 break;
2894 default:
2895 return -EINVAL;
2896 }
2897 v4l2_ctrl_lock(ctrl);
2898 ctrl->minimum = min;
2899 ctrl->maximum = max;
2900 ctrl->step = step;
2901 ctrl->default_value = def;
2902 c.value = ctrl->cur.val;
2903 if (validate_new(ctrl, &c))
2904 c.value = def;
2905 if (c.value != ctrl->cur.val)
2906 ret = set_ctrl(NULL, ctrl, &c, V4L2_EVENT_CTRL_CH_RANGE);
2907 else
2908 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
2909 v4l2_ctrl_unlock(ctrl);
2910 return ret;
2911 }
2912 EXPORT_SYMBOL(v4l2_ctrl_modify_range);
2913
2914 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
2915 {
2916 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2917
2918 if (ctrl == NULL)
2919 return -EINVAL;
2920
2921 v4l2_ctrl_lock(ctrl);
2922 list_add_tail(&sev->node, &ctrl->ev_subs);
2923 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2924 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2925 struct v4l2_event ev;
2926 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2927
2928 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2929 changes |= V4L2_EVENT_CTRL_CH_VALUE;
2930 fill_event(&ev, ctrl, changes);
2931 /* Mark the queue as active, allowing this initial
2932 event to be accepted. */
2933 sev->elems = elems;
2934 v4l2_event_queue_fh(sev->fh, &ev);
2935 }
2936 v4l2_ctrl_unlock(ctrl);
2937 return 0;
2938 }
2939
2940 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
2941 {
2942 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2943
2944 v4l2_ctrl_lock(ctrl);
2945 list_del(&sev->node);
2946 v4l2_ctrl_unlock(ctrl);
2947 }
2948
2949 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
2950 {
2951 u32 old_changes = old->u.ctrl.changes;
2952
2953 old->u.ctrl = new->u.ctrl;
2954 old->u.ctrl.changes |= old_changes;
2955 }
2956 EXPORT_SYMBOL(v4l2_ctrl_replace);
2957
2958 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
2959 {
2960 new->u.ctrl.changes |= old->u.ctrl.changes;
2961 }
2962 EXPORT_SYMBOL(v4l2_ctrl_merge);
2963
2964 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
2965 .add = v4l2_ctrl_add_event,
2966 .del = v4l2_ctrl_del_event,
2967 .replace = v4l2_ctrl_replace,
2968 .merge = v4l2_ctrl_merge,
2969 };
2970 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
2971
2972 int v4l2_ctrl_log_status(struct file *file, void *fh)
2973 {
2974 struct video_device *vfd = video_devdata(file);
2975 struct v4l2_fh *vfh = file->private_data;
2976
2977 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
2978 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
2979 vfd->v4l2_dev->name);
2980 return 0;
2981 }
2982 EXPORT_SYMBOL(v4l2_ctrl_log_status);
2983
2984 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
2985 const struct v4l2_event_subscription *sub)
2986 {
2987 if (sub->type == V4L2_EVENT_CTRL)
2988 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
2989 return -EINVAL;
2990 }
2991 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
2992
2993 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
2994 struct v4l2_event_subscription *sub)
2995 {
2996 if (!sd->ctrl_handler)
2997 return -EINVAL;
2998 return v4l2_ctrl_subscribe_event(fh, sub);
2999 }
3000 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3001
3002 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3003 {
3004 struct v4l2_fh *fh = file->private_data;
3005
3006 if (v4l2_event_pending(fh))
3007 return POLLPRI;
3008 poll_wait(file, &fh->wait, wait);
3009 return 0;
3010 }
3011 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux kernel - Deliverables
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