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Merge remote-tracking branch 'sound-asoc/for-next'
[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 "Stereo High",
365 "Multiview High",
366 NULL,
367 };
368 static const char * const vui_sar_idc[] = {
369 "Unspecified",
370 "1:1",
371 "12:11",
372 "10:11",
373 "16:11",
374 "40:33",
375 "24:11",
376 "20:11",
377 "32:11",
378 "80:33",
379 "18:11",
380 "15:11",
381 "64:33",
382 "160:99",
383 "4:3",
384 "3:2",
385 "2:1",
386 "Extended SAR",
387 NULL,
388 };
389 static const char * const h264_fp_arrangement_type[] = {
390 "Checkerboard",
391 "Column",
392 "Row",
393 "Side by Side",
394 "Top Bottom",
395 "Temporal",
396 NULL,
397 };
398 static const char * const h264_fmo_map_type[] = {
399 "Interleaved Slices",
400 "Scattered Slices",
401 "Foreground with Leftover",
402 "Box Out",
403 "Raster Scan",
404 "Wipe Scan",
405 "Explicit",
406 NULL,
407 };
408 static const char * const mpeg_mpeg4_level[] = {
409 "0",
410 "0b",
411 "1",
412 "2",
413 "3",
414 "3b",
415 "4",
416 "5",
417 NULL,
418 };
419 static const char * const mpeg4_profile[] = {
420 "Simple",
421 "Advanced Simple",
422 "Core",
423 "Simple Scalable",
424 "Advanced Coding Efficiency",
425 NULL,
426 };
427
428 static const char * const vpx_golden_frame_sel[] = {
429 "Use Previous Frame",
430 "Use Previous Specific Frame",
431 NULL,
432 };
433
434 static const char * const flash_led_mode[] = {
435 "Off",
436 "Flash",
437 "Torch",
438 NULL,
439 };
440 static const char * const flash_strobe_source[] = {
441 "Software",
442 "External",
443 NULL,
444 };
445
446 static const char * const jpeg_chroma_subsampling[] = {
447 "4:4:4",
448 "4:2:2",
449 "4:2:0",
450 "4:1:1",
451 "4:1:0",
452 "Gray",
453 NULL,
454 };
455 static const char * const dv_tx_mode[] = {
456 "DVI-D",
457 "HDMI",
458 NULL,
459 };
460 static const char * const dv_rgb_range[] = {
461 "Automatic",
462 "RGB limited range (16-235)",
463 "RGB full range (0-255)",
464 NULL,
465 };
466 static const char * const dv_it_content_type[] = {
467 "Graphics",
468 "Photo",
469 "Cinema",
470 "Game",
471 "No IT Content",
472 NULL,
473 };
474 static const char * const detect_md_mode[] = {
475 "Disabled",
476 "Global",
477 "Threshold Grid",
478 "Region Grid",
479 NULL,
480 };
481
482
483 switch (id) {
484 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
485 return mpeg_audio_sampling_freq;
486 case V4L2_CID_MPEG_AUDIO_ENCODING:
487 return mpeg_audio_encoding;
488 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
489 return mpeg_audio_l1_bitrate;
490 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
491 return mpeg_audio_l2_bitrate;
492 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
493 return mpeg_audio_l3_bitrate;
494 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
495 return mpeg_audio_ac3_bitrate;
496 case V4L2_CID_MPEG_AUDIO_MODE:
497 return mpeg_audio_mode;
498 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
499 return mpeg_audio_mode_extension;
500 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
501 return mpeg_audio_emphasis;
502 case V4L2_CID_MPEG_AUDIO_CRC:
503 return mpeg_audio_crc;
504 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
505 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
506 return mpeg_audio_dec_playback;
507 case V4L2_CID_MPEG_VIDEO_ENCODING:
508 return mpeg_video_encoding;
509 case V4L2_CID_MPEG_VIDEO_ASPECT:
510 return mpeg_video_aspect;
511 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
512 return mpeg_video_bitrate_mode;
513 case V4L2_CID_MPEG_STREAM_TYPE:
514 return mpeg_stream_type;
515 case V4L2_CID_MPEG_STREAM_VBI_FMT:
516 return mpeg_stream_vbi_fmt;
517 case V4L2_CID_POWER_LINE_FREQUENCY:
518 return camera_power_line_frequency;
519 case V4L2_CID_EXPOSURE_AUTO:
520 return camera_exposure_auto;
521 case V4L2_CID_EXPOSURE_METERING:
522 return camera_exposure_metering;
523 case V4L2_CID_AUTO_FOCUS_RANGE:
524 return camera_auto_focus_range;
525 case V4L2_CID_COLORFX:
526 return colorfx;
527 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
528 return auto_n_preset_white_balance;
529 case V4L2_CID_ISO_SENSITIVITY_AUTO:
530 return camera_iso_sensitivity_auto;
531 case V4L2_CID_SCENE_MODE:
532 return scene_mode;
533 case V4L2_CID_TUNE_PREEMPHASIS:
534 return tune_emphasis;
535 case V4L2_CID_TUNE_DEEMPHASIS:
536 return tune_emphasis;
537 case V4L2_CID_FLASH_LED_MODE:
538 return flash_led_mode;
539 case V4L2_CID_FLASH_STROBE_SOURCE:
540 return flash_strobe_source;
541 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
542 return header_mode;
543 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
544 return multi_slice;
545 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
546 return entropy_mode;
547 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
548 return mpeg_h264_level;
549 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
550 return h264_loop_filter;
551 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
552 return h264_profile;
553 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
554 return vui_sar_idc;
555 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
556 return h264_fp_arrangement_type;
557 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
558 return h264_fmo_map_type;
559 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
560 return mpeg_mpeg4_level;
561 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
562 return mpeg4_profile;
563 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
564 return vpx_golden_frame_sel;
565 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
566 return jpeg_chroma_subsampling;
567 case V4L2_CID_DV_TX_MODE:
568 return dv_tx_mode;
569 case V4L2_CID_DV_TX_RGB_RANGE:
570 case V4L2_CID_DV_RX_RGB_RANGE:
571 return dv_rgb_range;
572 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
573 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
574 return dv_it_content_type;
575 case V4L2_CID_DETECT_MD_MODE:
576 return detect_md_mode;
577
578 default:
579 return NULL;
580 }
581 }
582 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
583
584 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
585 /*
586 * Returns NULL or an s64 type array containing the menu for given
587 * control ID. The total number of the menu items is returned in @len.
588 */
589 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
590 {
591 static const s64 qmenu_int_vpx_num_partitions[] = {
592 1, 2, 4, 8,
593 };
594
595 static const s64 qmenu_int_vpx_num_ref_frames[] = {
596 1, 2, 3,
597 };
598
599 switch (id) {
600 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
601 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
602 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
603 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
604 default:
605 *len = 0;
606 return NULL;
607 }
608 }
609 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
610
611 /* Return the control name. */
612 const char *v4l2_ctrl_get_name(u32 id)
613 {
614 switch (id) {
615 /* USER controls */
616 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
617 case V4L2_CID_USER_CLASS: return "User Controls";
618 case V4L2_CID_BRIGHTNESS: return "Brightness";
619 case V4L2_CID_CONTRAST: return "Contrast";
620 case V4L2_CID_SATURATION: return "Saturation";
621 case V4L2_CID_HUE: return "Hue";
622 case V4L2_CID_AUDIO_VOLUME: return "Volume";
623 case V4L2_CID_AUDIO_BALANCE: return "Balance";
624 case V4L2_CID_AUDIO_BASS: return "Bass";
625 case V4L2_CID_AUDIO_TREBLE: return "Treble";
626 case V4L2_CID_AUDIO_MUTE: return "Mute";
627 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
628 case V4L2_CID_BLACK_LEVEL: return "Black Level";
629 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
630 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
631 case V4L2_CID_RED_BALANCE: return "Red Balance";
632 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
633 case V4L2_CID_GAMMA: return "Gamma";
634 case V4L2_CID_EXPOSURE: return "Exposure";
635 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
636 case V4L2_CID_GAIN: return "Gain";
637 case V4L2_CID_HFLIP: return "Horizontal Flip";
638 case V4L2_CID_VFLIP: return "Vertical Flip";
639 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
640 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
641 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
642 case V4L2_CID_SHARPNESS: return "Sharpness";
643 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
644 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
645 case V4L2_CID_COLOR_KILLER: return "Color Killer";
646 case V4L2_CID_COLORFX: return "Color Effects";
647 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
648 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
649 case V4L2_CID_ROTATE: return "Rotate";
650 case V4L2_CID_BG_COLOR: return "Background Color";
651 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
652 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
653 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
654 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
655 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
656 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
657 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
658
659 /* Codec controls */
660 /* The MPEG controls are applicable to all codec controls
661 * and the 'MPEG' part of the define is historical */
662 /* Keep the order of the 'case's the same as in videodev2.h! */
663 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
664 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
665 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
666 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
667 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
668 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
669 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
670 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
671 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
672 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
673 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
674 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
675 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
676 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
677 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
678 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
679 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
680 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
681 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
682 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
683 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
684 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
685 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
686 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
687 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
688 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
689 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
690 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
691 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
692 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
693 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
694 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
695 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
696 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
697 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
698 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
699 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
700 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
701 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
702 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
703 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
704 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
705 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
706 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
707 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
708 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
709 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
710 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
711 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
712 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
713 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
714 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
715 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
716 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
717 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
718 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
719 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
720 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
721 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
722 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
723 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
724 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
725 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
726 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
727 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
728 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
729 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
730 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
731 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
732 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
733 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
734 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
735 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
736 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
737 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
738 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
739 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
740 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
741 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
742 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
743 return "H264 Set QP Value for HC Layers";
744 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
745 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
746 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
747 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
748 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
749 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
750 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
751 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
752 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
753 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
754 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
755 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
756 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
757 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
758 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
759 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
760 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
761 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
762 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
763
764 /* VPX controls */
765 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
766 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
767 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
768 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
769 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
770 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
771 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
772 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
773 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
774 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
775 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
776 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
777
778 /* CAMERA controls */
779 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
780 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
781 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
782 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
783 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
784 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
785 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
786 case V4L2_CID_PAN_RESET: return "Pan, Reset";
787 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
788 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
789 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
790 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
791 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
792 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
793 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
794 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
795 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
796 case V4L2_CID_PRIVACY: return "Privacy";
797 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
798 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
799 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
800 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
801 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
802 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
803 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
804 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
805 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
806 case V4L2_CID_SCENE_MODE: return "Scene Mode";
807 case V4L2_CID_3A_LOCK: return "3A Lock";
808 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
809 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
810 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
811 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
812 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
813 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
814
815 /* FM Radio Modulator controls */
816 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
817 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
818 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
819 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
820 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
821 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
822 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
823 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
824 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
825 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
826 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
827 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
828 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
829 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
830 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
831 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
832 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
833 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
834 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
835 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
836 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
837 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
838 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
839 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
840 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
841 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
842 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
843 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
844 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
845 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
846
847 /* Flash controls */
848 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
849 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
850 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
851 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
852 case V4L2_CID_FLASH_STROBE: return "Strobe";
853 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
854 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
855 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
856 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
857 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
858 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
859 case V4L2_CID_FLASH_FAULT: return "Faults";
860 case V4L2_CID_FLASH_CHARGE: return "Charge";
861 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
862
863 /* JPEG encoder controls */
864 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
865 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
866 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
867 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
868 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
869 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
870
871 /* Image source controls */
872 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
873 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
874 case V4L2_CID_VBLANK: return "Vertical Blanking";
875 case V4L2_CID_HBLANK: return "Horizontal Blanking";
876 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
877 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
878 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
879 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
880 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
881
882 /* Image processing controls */
883 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
884 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
885 case V4L2_CID_LINK_FREQ: return "Link Frequency";
886 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
887 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
888
889 /* DV controls */
890 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
891 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
892 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
893 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
894 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
895 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
896 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
897 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
898 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
899 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
900 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
901
902 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
903 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
904 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
905 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
906 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
907 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
908 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
909 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
910 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
911 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
912 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
913 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
914 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
915 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
916 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
917 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
918 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
919 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
920 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
921 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
922
923 /* Detection controls */
924 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
925 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
926 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
927 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
928 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
929 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
930 default:
931 return NULL;
932 }
933 }
934 EXPORT_SYMBOL(v4l2_ctrl_get_name);
935
936 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
937 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
938 {
939 *name = v4l2_ctrl_get_name(id);
940 *flags = 0;
941
942 switch (id) {
943 case V4L2_CID_AUDIO_MUTE:
944 case V4L2_CID_AUDIO_LOUDNESS:
945 case V4L2_CID_AUTO_WHITE_BALANCE:
946 case V4L2_CID_AUTOGAIN:
947 case V4L2_CID_HFLIP:
948 case V4L2_CID_VFLIP:
949 case V4L2_CID_HUE_AUTO:
950 case V4L2_CID_CHROMA_AGC:
951 case V4L2_CID_COLOR_KILLER:
952 case V4L2_CID_AUTOBRIGHTNESS:
953 case V4L2_CID_MPEG_AUDIO_MUTE:
954 case V4L2_CID_MPEG_VIDEO_MUTE:
955 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
956 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
957 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
958 case V4L2_CID_FOCUS_AUTO:
959 case V4L2_CID_PRIVACY:
960 case V4L2_CID_AUDIO_LIMITER_ENABLED:
961 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
962 case V4L2_CID_PILOT_TONE_ENABLED:
963 case V4L2_CID_ILLUMINATORS_1:
964 case V4L2_CID_ILLUMINATORS_2:
965 case V4L2_CID_FLASH_STROBE_STATUS:
966 case V4L2_CID_FLASH_CHARGE:
967 case V4L2_CID_FLASH_READY:
968 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
969 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
970 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
971 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
972 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
973 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
974 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
975 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
976 case V4L2_CID_WIDE_DYNAMIC_RANGE:
977 case V4L2_CID_IMAGE_STABILIZATION:
978 case V4L2_CID_RDS_RECEPTION:
979 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
980 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
981 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
982 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
983 case V4L2_CID_RF_TUNER_PLL_LOCK:
984 case V4L2_CID_RDS_TX_MONO_STEREO:
985 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
986 case V4L2_CID_RDS_TX_COMPRESSED:
987 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
988 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
989 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
990 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
991 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
992 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
993 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
994 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
995 *type = V4L2_CTRL_TYPE_BOOLEAN;
996 *min = 0;
997 *max = *step = 1;
998 break;
999 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1000 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1001 *type = V4L2_CTRL_TYPE_INTEGER;
1002 break;
1003 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1004 case V4L2_CID_PAN_RESET:
1005 case V4L2_CID_TILT_RESET:
1006 case V4L2_CID_FLASH_STROBE:
1007 case V4L2_CID_FLASH_STROBE_STOP:
1008 case V4L2_CID_AUTO_FOCUS_START:
1009 case V4L2_CID_AUTO_FOCUS_STOP:
1010 *type = V4L2_CTRL_TYPE_BUTTON;
1011 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1012 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1013 *min = *max = *step = *def = 0;
1014 break;
1015 case V4L2_CID_POWER_LINE_FREQUENCY:
1016 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1017 case V4L2_CID_MPEG_AUDIO_ENCODING:
1018 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1019 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1020 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1021 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1022 case V4L2_CID_MPEG_AUDIO_MODE:
1023 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1024 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1025 case V4L2_CID_MPEG_AUDIO_CRC:
1026 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1027 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1028 case V4L2_CID_MPEG_VIDEO_ENCODING:
1029 case V4L2_CID_MPEG_VIDEO_ASPECT:
1030 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1031 case V4L2_CID_MPEG_STREAM_TYPE:
1032 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1033 case V4L2_CID_EXPOSURE_AUTO:
1034 case V4L2_CID_AUTO_FOCUS_RANGE:
1035 case V4L2_CID_COLORFX:
1036 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1037 case V4L2_CID_TUNE_PREEMPHASIS:
1038 case V4L2_CID_FLASH_LED_MODE:
1039 case V4L2_CID_FLASH_STROBE_SOURCE:
1040 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1041 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1042 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1043 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1044 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1045 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1046 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1047 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1048 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1049 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1050 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1051 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1052 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1053 case V4L2_CID_EXPOSURE_METERING:
1054 case V4L2_CID_SCENE_MODE:
1055 case V4L2_CID_DV_TX_MODE:
1056 case V4L2_CID_DV_TX_RGB_RANGE:
1057 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1058 case V4L2_CID_DV_RX_RGB_RANGE:
1059 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1060 case V4L2_CID_TEST_PATTERN:
1061 case V4L2_CID_TUNE_DEEMPHASIS:
1062 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1063 case V4L2_CID_DETECT_MD_MODE:
1064 *type = V4L2_CTRL_TYPE_MENU;
1065 break;
1066 case V4L2_CID_LINK_FREQ:
1067 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1068 break;
1069 case V4L2_CID_RDS_TX_PS_NAME:
1070 case V4L2_CID_RDS_TX_RADIO_TEXT:
1071 case V4L2_CID_RDS_RX_PS_NAME:
1072 case V4L2_CID_RDS_RX_RADIO_TEXT:
1073 *type = V4L2_CTRL_TYPE_STRING;
1074 break;
1075 case V4L2_CID_ISO_SENSITIVITY:
1076 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1077 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1078 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1079 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1080 break;
1081 case V4L2_CID_USER_CLASS:
1082 case V4L2_CID_CAMERA_CLASS:
1083 case V4L2_CID_MPEG_CLASS:
1084 case V4L2_CID_FM_TX_CLASS:
1085 case V4L2_CID_FLASH_CLASS:
1086 case V4L2_CID_JPEG_CLASS:
1087 case V4L2_CID_IMAGE_SOURCE_CLASS:
1088 case V4L2_CID_IMAGE_PROC_CLASS:
1089 case V4L2_CID_DV_CLASS:
1090 case V4L2_CID_FM_RX_CLASS:
1091 case V4L2_CID_RF_TUNER_CLASS:
1092 case V4L2_CID_DETECT_CLASS:
1093 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1094 /* You can neither read not write these */
1095 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1096 *min = *max = *step = *def = 0;
1097 break;
1098 case V4L2_CID_BG_COLOR:
1099 *type = V4L2_CTRL_TYPE_INTEGER;
1100 *step = 1;
1101 *min = 0;
1102 /* Max is calculated as RGB888 that is 2^24 */
1103 *max = 0xFFFFFF;
1104 break;
1105 case V4L2_CID_FLASH_FAULT:
1106 case V4L2_CID_JPEG_ACTIVE_MARKER:
1107 case V4L2_CID_3A_LOCK:
1108 case V4L2_CID_AUTO_FOCUS_STATUS:
1109 case V4L2_CID_DV_TX_HOTPLUG:
1110 case V4L2_CID_DV_TX_RXSENSE:
1111 case V4L2_CID_DV_TX_EDID_PRESENT:
1112 case V4L2_CID_DV_RX_POWER_PRESENT:
1113 *type = V4L2_CTRL_TYPE_BITMASK;
1114 break;
1115 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1116 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1117 *type = V4L2_CTRL_TYPE_INTEGER;
1118 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1119 break;
1120 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1121 *type = V4L2_CTRL_TYPE_INTEGER64;
1122 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1123 *min = *def = 0;
1124 *max = 0x1ffffffffLL;
1125 *step = 1;
1126 break;
1127 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1128 *type = V4L2_CTRL_TYPE_INTEGER64;
1129 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1130 *min = *def = 0;
1131 *max = 0x7fffffffffffffffLL;
1132 *step = 1;
1133 break;
1134 case V4L2_CID_PIXEL_RATE:
1135 *type = V4L2_CTRL_TYPE_INTEGER64;
1136 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1137 break;
1138 case V4L2_CID_DETECT_MD_REGION_GRID:
1139 *type = V4L2_CTRL_TYPE_U8;
1140 break;
1141 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1142 *type = V4L2_CTRL_TYPE_U16;
1143 break;
1144 case V4L2_CID_RDS_TX_ALT_FREQS:
1145 *type = V4L2_CTRL_TYPE_U32;
1146 break;
1147 default:
1148 *type = V4L2_CTRL_TYPE_INTEGER;
1149 break;
1150 }
1151 switch (id) {
1152 case V4L2_CID_MPEG_AUDIO_ENCODING:
1153 case V4L2_CID_MPEG_AUDIO_MODE:
1154 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1155 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1156 case V4L2_CID_MPEG_STREAM_TYPE:
1157 *flags |= V4L2_CTRL_FLAG_UPDATE;
1158 break;
1159 case V4L2_CID_AUDIO_VOLUME:
1160 case V4L2_CID_AUDIO_BALANCE:
1161 case V4L2_CID_AUDIO_BASS:
1162 case V4L2_CID_AUDIO_TREBLE:
1163 case V4L2_CID_BRIGHTNESS:
1164 case V4L2_CID_CONTRAST:
1165 case V4L2_CID_SATURATION:
1166 case V4L2_CID_HUE:
1167 case V4L2_CID_RED_BALANCE:
1168 case V4L2_CID_BLUE_BALANCE:
1169 case V4L2_CID_GAMMA:
1170 case V4L2_CID_SHARPNESS:
1171 case V4L2_CID_CHROMA_GAIN:
1172 case V4L2_CID_RDS_TX_DEVIATION:
1173 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1174 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1175 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1176 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1177 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1178 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1179 case V4L2_CID_PILOT_TONE_DEVIATION:
1180 case V4L2_CID_PILOT_TONE_FREQUENCY:
1181 case V4L2_CID_TUNE_POWER_LEVEL:
1182 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1183 case V4L2_CID_RF_TUNER_RF_GAIN:
1184 case V4L2_CID_RF_TUNER_LNA_GAIN:
1185 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1186 case V4L2_CID_RF_TUNER_IF_GAIN:
1187 case V4L2_CID_RF_TUNER_BANDWIDTH:
1188 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1189 *flags |= V4L2_CTRL_FLAG_SLIDER;
1190 break;
1191 case V4L2_CID_PAN_RELATIVE:
1192 case V4L2_CID_TILT_RELATIVE:
1193 case V4L2_CID_FOCUS_RELATIVE:
1194 case V4L2_CID_IRIS_RELATIVE:
1195 case V4L2_CID_ZOOM_RELATIVE:
1196 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1197 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1198 break;
1199 case V4L2_CID_FLASH_STROBE_STATUS:
1200 case V4L2_CID_AUTO_FOCUS_STATUS:
1201 case V4L2_CID_FLASH_READY:
1202 case V4L2_CID_DV_TX_HOTPLUG:
1203 case V4L2_CID_DV_TX_RXSENSE:
1204 case V4L2_CID_DV_TX_EDID_PRESENT:
1205 case V4L2_CID_DV_RX_POWER_PRESENT:
1206 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1207 case V4L2_CID_RDS_RX_PTY:
1208 case V4L2_CID_RDS_RX_PS_NAME:
1209 case V4L2_CID_RDS_RX_RADIO_TEXT:
1210 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1211 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1212 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1213 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1214 break;
1215 case V4L2_CID_RF_TUNER_PLL_LOCK:
1216 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1217 break;
1218 }
1219 }
1220 EXPORT_SYMBOL(v4l2_ctrl_fill);
1221
1222 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1223 {
1224 memset(ev->reserved, 0, sizeof(ev->reserved));
1225 ev->type = V4L2_EVENT_CTRL;
1226 ev->id = ctrl->id;
1227 ev->u.ctrl.changes = changes;
1228 ev->u.ctrl.type = ctrl->type;
1229 ev->u.ctrl.flags = ctrl->flags;
1230 if (ctrl->is_ptr)
1231 ev->u.ctrl.value64 = 0;
1232 else
1233 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1234 ev->u.ctrl.minimum = ctrl->minimum;
1235 ev->u.ctrl.maximum = ctrl->maximum;
1236 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1237 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1238 ev->u.ctrl.step = 1;
1239 else
1240 ev->u.ctrl.step = ctrl->step;
1241 ev->u.ctrl.default_value = ctrl->default_value;
1242 }
1243
1244 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1245 {
1246 struct v4l2_event ev;
1247 struct v4l2_subscribed_event *sev;
1248
1249 if (list_empty(&ctrl->ev_subs))
1250 return;
1251 fill_event(&ev, ctrl, changes);
1252
1253 list_for_each_entry(sev, &ctrl->ev_subs, node)
1254 if (sev->fh != fh ||
1255 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1256 v4l2_event_queue_fh(sev->fh, &ev);
1257 }
1258
1259 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1260 union v4l2_ctrl_ptr ptr1,
1261 union v4l2_ctrl_ptr ptr2)
1262 {
1263 switch (ctrl->type) {
1264 case V4L2_CTRL_TYPE_BUTTON:
1265 return false;
1266 case V4L2_CTRL_TYPE_STRING:
1267 idx *= ctrl->elem_size;
1268 /* strings are always 0-terminated */
1269 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1270 case V4L2_CTRL_TYPE_INTEGER64:
1271 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1272 case V4L2_CTRL_TYPE_U8:
1273 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1274 case V4L2_CTRL_TYPE_U16:
1275 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1276 case V4L2_CTRL_TYPE_U32:
1277 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1278 default:
1279 if (ctrl->is_int)
1280 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1281 idx *= ctrl->elem_size;
1282 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1283 }
1284 }
1285
1286 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1287 union v4l2_ctrl_ptr ptr)
1288 {
1289 switch (ctrl->type) {
1290 case V4L2_CTRL_TYPE_STRING:
1291 idx *= ctrl->elem_size;
1292 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1293 ptr.p_char[idx + ctrl->minimum] = '\0';
1294 break;
1295 case V4L2_CTRL_TYPE_INTEGER64:
1296 ptr.p_s64[idx] = ctrl->default_value;
1297 break;
1298 case V4L2_CTRL_TYPE_INTEGER:
1299 case V4L2_CTRL_TYPE_INTEGER_MENU:
1300 case V4L2_CTRL_TYPE_MENU:
1301 case V4L2_CTRL_TYPE_BITMASK:
1302 case V4L2_CTRL_TYPE_BOOLEAN:
1303 ptr.p_s32[idx] = ctrl->default_value;
1304 break;
1305 case V4L2_CTRL_TYPE_U8:
1306 ptr.p_u8[idx] = ctrl->default_value;
1307 break;
1308 case V4L2_CTRL_TYPE_U16:
1309 ptr.p_u16[idx] = ctrl->default_value;
1310 break;
1311 case V4L2_CTRL_TYPE_U32:
1312 ptr.p_u32[idx] = ctrl->default_value;
1313 break;
1314 default:
1315 idx *= ctrl->elem_size;
1316 memset(ptr.p + idx, 0, ctrl->elem_size);
1317 break;
1318 }
1319 }
1320
1321 static void std_log(const struct v4l2_ctrl *ctrl)
1322 {
1323 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1324
1325 if (ctrl->is_array) {
1326 unsigned i;
1327
1328 for (i = 0; i < ctrl->nr_of_dims; i++)
1329 pr_cont("[%u]", ctrl->dims[i]);
1330 pr_cont(" ");
1331 }
1332
1333 switch (ctrl->type) {
1334 case V4L2_CTRL_TYPE_INTEGER:
1335 pr_cont("%d", *ptr.p_s32);
1336 break;
1337 case V4L2_CTRL_TYPE_BOOLEAN:
1338 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1339 break;
1340 case V4L2_CTRL_TYPE_MENU:
1341 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1342 break;
1343 case V4L2_CTRL_TYPE_INTEGER_MENU:
1344 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1345 break;
1346 case V4L2_CTRL_TYPE_BITMASK:
1347 pr_cont("0x%08x", *ptr.p_s32);
1348 break;
1349 case V4L2_CTRL_TYPE_INTEGER64:
1350 pr_cont("%lld", *ptr.p_s64);
1351 break;
1352 case V4L2_CTRL_TYPE_STRING:
1353 pr_cont("%s", ptr.p_char);
1354 break;
1355 case V4L2_CTRL_TYPE_U8:
1356 pr_cont("%u", (unsigned)*ptr.p_u8);
1357 break;
1358 case V4L2_CTRL_TYPE_U16:
1359 pr_cont("%u", (unsigned)*ptr.p_u16);
1360 break;
1361 case V4L2_CTRL_TYPE_U32:
1362 pr_cont("%u", (unsigned)*ptr.p_u32);
1363 break;
1364 default:
1365 pr_cont("unknown type %d", ctrl->type);
1366 break;
1367 }
1368 }
1369
1370 /*
1371 * Round towards the closest legal value. Be careful when we are
1372 * close to the maximum range of the control type to prevent
1373 * wrap-arounds.
1374 */
1375 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1376 ({ \
1377 offset_type offset; \
1378 if ((ctrl)->maximum >= 0 && \
1379 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1380 val = (ctrl)->maximum; \
1381 else \
1382 val += (s32)((ctrl)->step / 2); \
1383 val = clamp_t(typeof(val), val, \
1384 (ctrl)->minimum, (ctrl)->maximum); \
1385 offset = (val) - (ctrl)->minimum; \
1386 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1387 val = (ctrl)->minimum + offset; \
1388 0; \
1389 })
1390
1391 /* Validate a new control */
1392 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1393 union v4l2_ctrl_ptr ptr)
1394 {
1395 size_t len;
1396 u64 offset;
1397 s64 val;
1398
1399 switch (ctrl->type) {
1400 case V4L2_CTRL_TYPE_INTEGER:
1401 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1402 case V4L2_CTRL_TYPE_INTEGER64:
1403 /*
1404 * We can't use the ROUND_TO_RANGE define here due to
1405 * the u64 divide that needs special care.
1406 */
1407 val = ptr.p_s64[idx];
1408 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1409 val = ctrl->maximum;
1410 else
1411 val += (s64)(ctrl->step / 2);
1412 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1413 offset = val - ctrl->minimum;
1414 do_div(offset, ctrl->step);
1415 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1416 return 0;
1417 case V4L2_CTRL_TYPE_U8:
1418 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1419 case V4L2_CTRL_TYPE_U16:
1420 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1421 case V4L2_CTRL_TYPE_U32:
1422 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1423
1424 case V4L2_CTRL_TYPE_BOOLEAN:
1425 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1426 return 0;
1427
1428 case V4L2_CTRL_TYPE_MENU:
1429 case V4L2_CTRL_TYPE_INTEGER_MENU:
1430 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1431 return -ERANGE;
1432 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1433 return -EINVAL;
1434 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1435 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1436 return -EINVAL;
1437 return 0;
1438
1439 case V4L2_CTRL_TYPE_BITMASK:
1440 ptr.p_s32[idx] &= ctrl->maximum;
1441 return 0;
1442
1443 case V4L2_CTRL_TYPE_BUTTON:
1444 case V4L2_CTRL_TYPE_CTRL_CLASS:
1445 ptr.p_s32[idx] = 0;
1446 return 0;
1447
1448 case V4L2_CTRL_TYPE_STRING:
1449 idx *= ctrl->elem_size;
1450 len = strlen(ptr.p_char + idx);
1451 if (len < ctrl->minimum)
1452 return -ERANGE;
1453 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1454 return -ERANGE;
1455 return 0;
1456
1457 default:
1458 return -EINVAL;
1459 }
1460 }
1461
1462 static const struct v4l2_ctrl_type_ops std_type_ops = {
1463 .equal = std_equal,
1464 .init = std_init,
1465 .log = std_log,
1466 .validate = std_validate,
1467 };
1468
1469 /* Helper function: copy the given control value back to the caller */
1470 static int ptr_to_user(struct v4l2_ext_control *c,
1471 struct v4l2_ctrl *ctrl,
1472 union v4l2_ctrl_ptr ptr)
1473 {
1474 u32 len;
1475
1476 if (ctrl->is_ptr && !ctrl->is_string)
1477 return copy_to_user(c->ptr, ptr.p, c->size) ?
1478 -EFAULT : 0;
1479
1480 switch (ctrl->type) {
1481 case V4L2_CTRL_TYPE_STRING:
1482 len = strlen(ptr.p_char);
1483 if (c->size < len + 1) {
1484 c->size = ctrl->elem_size;
1485 return -ENOSPC;
1486 }
1487 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1488 -EFAULT : 0;
1489 case V4L2_CTRL_TYPE_INTEGER64:
1490 c->value64 = *ptr.p_s64;
1491 break;
1492 default:
1493 c->value = *ptr.p_s32;
1494 break;
1495 }
1496 return 0;
1497 }
1498
1499 /* Helper function: copy the current control value back to the caller */
1500 static int cur_to_user(struct v4l2_ext_control *c,
1501 struct v4l2_ctrl *ctrl)
1502 {
1503 return ptr_to_user(c, ctrl, ctrl->p_cur);
1504 }
1505
1506 /* Helper function: copy the new control value back to the caller */
1507 static int new_to_user(struct v4l2_ext_control *c,
1508 struct v4l2_ctrl *ctrl)
1509 {
1510 return ptr_to_user(c, ctrl, ctrl->p_new);
1511 }
1512
1513 /* Helper function: copy the initial control value back to the caller */
1514 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1515 {
1516 int idx;
1517
1518 for (idx = 0; idx < ctrl->elems; idx++)
1519 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1520
1521 return ptr_to_user(c, ctrl, ctrl->p_new);
1522 }
1523
1524 /* Helper function: copy the caller-provider value to the given control value */
1525 static int user_to_ptr(struct v4l2_ext_control *c,
1526 struct v4l2_ctrl *ctrl,
1527 union v4l2_ctrl_ptr ptr)
1528 {
1529 int ret;
1530 u32 size;
1531
1532 ctrl->is_new = 1;
1533 if (ctrl->is_ptr && !ctrl->is_string) {
1534 unsigned idx;
1535
1536 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1537 if (ret || !ctrl->is_array)
1538 return ret;
1539 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1540 ctrl->type_ops->init(ctrl, idx, ptr);
1541 return 0;
1542 }
1543
1544 switch (ctrl->type) {
1545 case V4L2_CTRL_TYPE_INTEGER64:
1546 *ptr.p_s64 = c->value64;
1547 break;
1548 case V4L2_CTRL_TYPE_STRING:
1549 size = c->size;
1550 if (size == 0)
1551 return -ERANGE;
1552 if (size > ctrl->maximum + 1)
1553 size = ctrl->maximum + 1;
1554 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1555 if (!ret) {
1556 char last = ptr.p_char[size - 1];
1557
1558 ptr.p_char[size - 1] = 0;
1559 /* If the string was longer than ctrl->maximum,
1560 then return an error. */
1561 if (strlen(ptr.p_char) == ctrl->maximum && last)
1562 return -ERANGE;
1563 }
1564 return ret;
1565 default:
1566 *ptr.p_s32 = c->value;
1567 break;
1568 }
1569 return 0;
1570 }
1571
1572 /* Helper function: copy the caller-provider value as the new control value */
1573 static int user_to_new(struct v4l2_ext_control *c,
1574 struct v4l2_ctrl *ctrl)
1575 {
1576 return user_to_ptr(c, ctrl, ctrl->p_new);
1577 }
1578
1579 /* Copy the one value to another. */
1580 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1581 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1582 {
1583 if (ctrl == NULL)
1584 return;
1585 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1586 }
1587
1588 /* Copy the new value to the current value. */
1589 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1590 {
1591 bool changed;
1592
1593 if (ctrl == NULL)
1594 return;
1595
1596 /* has_changed is set by cluster_changed */
1597 changed = ctrl->has_changed;
1598 if (changed)
1599 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1600
1601 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1602 /* Note: CH_FLAGS is only set for auto clusters. */
1603 ctrl->flags &=
1604 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1605 if (!is_cur_manual(ctrl->cluster[0])) {
1606 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1607 if (ctrl->cluster[0]->has_volatiles)
1608 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1609 }
1610 fh = NULL;
1611 }
1612 if (changed || ch_flags) {
1613 /* If a control was changed that was not one of the controls
1614 modified by the application, then send the event to all. */
1615 if (!ctrl->is_new)
1616 fh = NULL;
1617 send_event(fh, ctrl,
1618 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1619 if (ctrl->call_notify && changed && ctrl->handler->notify)
1620 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1621 }
1622 }
1623
1624 /* Copy the current value to the new value */
1625 static void cur_to_new(struct v4l2_ctrl *ctrl)
1626 {
1627 if (ctrl == NULL)
1628 return;
1629 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1630 }
1631
1632 /* Return non-zero if one or more of the controls in the cluster has a new
1633 value that differs from the current value. */
1634 static int cluster_changed(struct v4l2_ctrl *master)
1635 {
1636 bool changed = false;
1637 unsigned idx;
1638 int i;
1639
1640 for (i = 0; i < master->ncontrols; i++) {
1641 struct v4l2_ctrl *ctrl = master->cluster[i];
1642 bool ctrl_changed = false;
1643
1644 if (ctrl == NULL)
1645 continue;
1646
1647 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1648 changed = ctrl_changed = true;
1649
1650 /*
1651 * Set has_changed to false to avoid generating
1652 * the event V4L2_EVENT_CTRL_CH_VALUE
1653 */
1654 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1655 ctrl->has_changed = false;
1656 continue;
1657 }
1658
1659 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1660 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1661 ctrl->p_cur, ctrl->p_new);
1662 ctrl->has_changed = ctrl_changed;
1663 changed |= ctrl->has_changed;
1664 }
1665 return changed;
1666 }
1667
1668 /* Control range checking */
1669 static int check_range(enum v4l2_ctrl_type type,
1670 s64 min, s64 max, u64 step, s64 def)
1671 {
1672 switch (type) {
1673 case V4L2_CTRL_TYPE_BOOLEAN:
1674 if (step != 1 || max > 1 || min < 0)
1675 return -ERANGE;
1676 /* fall through */
1677 case V4L2_CTRL_TYPE_U8:
1678 case V4L2_CTRL_TYPE_U16:
1679 case V4L2_CTRL_TYPE_U32:
1680 case V4L2_CTRL_TYPE_INTEGER:
1681 case V4L2_CTRL_TYPE_INTEGER64:
1682 if (step == 0 || min > max || def < min || def > max)
1683 return -ERANGE;
1684 return 0;
1685 case V4L2_CTRL_TYPE_BITMASK:
1686 if (step || min || !max || (def & ~max))
1687 return -ERANGE;
1688 return 0;
1689 case V4L2_CTRL_TYPE_MENU:
1690 case V4L2_CTRL_TYPE_INTEGER_MENU:
1691 if (min > max || def < min || def > max)
1692 return -ERANGE;
1693 /* Note: step == menu_skip_mask for menu controls.
1694 So here we check if the default value is masked out. */
1695 if (step && ((1 << def) & step))
1696 return -EINVAL;
1697 return 0;
1698 case V4L2_CTRL_TYPE_STRING:
1699 if (min > max || min < 0 || step < 1 || def)
1700 return -ERANGE;
1701 return 0;
1702 default:
1703 return 0;
1704 }
1705 }
1706
1707 /* Validate a new control */
1708 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1709 {
1710 unsigned idx;
1711 int err = 0;
1712
1713 for (idx = 0; !err && idx < ctrl->elems; idx++)
1714 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1715 return err;
1716 }
1717
1718 static inline u32 node2id(struct list_head *node)
1719 {
1720 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1721 }
1722
1723 /* Set the handler's error code if it wasn't set earlier already */
1724 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1725 {
1726 if (hdl->error == 0)
1727 hdl->error = err;
1728 return err;
1729 }
1730
1731 /* Initialize the handler */
1732 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1733 unsigned nr_of_controls_hint,
1734 struct lock_class_key *key, const char *name)
1735 {
1736 hdl->lock = &hdl->_lock;
1737 mutex_init(hdl->lock);
1738 lockdep_set_class_and_name(hdl->lock, key, name);
1739 INIT_LIST_HEAD(&hdl->ctrls);
1740 INIT_LIST_HEAD(&hdl->ctrl_refs);
1741 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1742 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1743 GFP_KERNEL);
1744 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1745 return hdl->error;
1746 }
1747 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1748
1749 /* Free all controls and control refs */
1750 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1751 {
1752 struct v4l2_ctrl_ref *ref, *next_ref;
1753 struct v4l2_ctrl *ctrl, *next_ctrl;
1754 struct v4l2_subscribed_event *sev, *next_sev;
1755
1756 if (hdl == NULL || hdl->buckets == NULL)
1757 return;
1758
1759 mutex_lock(hdl->lock);
1760 /* Free all nodes */
1761 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1762 list_del(&ref->node);
1763 kfree(ref);
1764 }
1765 /* Free all controls owned by the handler */
1766 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1767 list_del(&ctrl->node);
1768 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1769 list_del(&sev->node);
1770 kfree(ctrl);
1771 }
1772 kfree(hdl->buckets);
1773 hdl->buckets = NULL;
1774 hdl->cached = NULL;
1775 hdl->error = 0;
1776 mutex_unlock(hdl->lock);
1777 }
1778 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1779
1780 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1781 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1782 with applications that do not use the NEXT_CTRL flag.
1783
1784 We just find the n-th private user control. It's O(N), but that should not
1785 be an issue in this particular case. */
1786 static struct v4l2_ctrl_ref *find_private_ref(
1787 struct v4l2_ctrl_handler *hdl, u32 id)
1788 {
1789 struct v4l2_ctrl_ref *ref;
1790
1791 id -= V4L2_CID_PRIVATE_BASE;
1792 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1793 /* Search for private user controls that are compatible with
1794 VIDIOC_G/S_CTRL. */
1795 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1796 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1797 if (!ref->ctrl->is_int)
1798 continue;
1799 if (id == 0)
1800 return ref;
1801 id--;
1802 }
1803 }
1804 return NULL;
1805 }
1806
1807 /* Find a control with the given ID. */
1808 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1809 {
1810 struct v4l2_ctrl_ref *ref;
1811 int bucket;
1812
1813 id &= V4L2_CTRL_ID_MASK;
1814
1815 /* Old-style private controls need special handling */
1816 if (id >= V4L2_CID_PRIVATE_BASE)
1817 return find_private_ref(hdl, id);
1818 bucket = id % hdl->nr_of_buckets;
1819
1820 /* Simple optimization: cache the last control found */
1821 if (hdl->cached && hdl->cached->ctrl->id == id)
1822 return hdl->cached;
1823
1824 /* Not in cache, search the hash */
1825 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1826 while (ref && ref->ctrl->id != id)
1827 ref = ref->next;
1828
1829 if (ref)
1830 hdl->cached = ref; /* cache it! */
1831 return ref;
1832 }
1833
1834 /* Find a control with the given ID. Take the handler's lock first. */
1835 static struct v4l2_ctrl_ref *find_ref_lock(
1836 struct v4l2_ctrl_handler *hdl, u32 id)
1837 {
1838 struct v4l2_ctrl_ref *ref = NULL;
1839
1840 if (hdl) {
1841 mutex_lock(hdl->lock);
1842 ref = find_ref(hdl, id);
1843 mutex_unlock(hdl->lock);
1844 }
1845 return ref;
1846 }
1847
1848 /* Find a control with the given ID. */
1849 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1850 {
1851 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1852
1853 return ref ? ref->ctrl : NULL;
1854 }
1855 EXPORT_SYMBOL(v4l2_ctrl_find);
1856
1857 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1858 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1859 struct v4l2_ctrl *ctrl)
1860 {
1861 struct v4l2_ctrl_ref *ref;
1862 struct v4l2_ctrl_ref *new_ref;
1863 u32 id = ctrl->id;
1864 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
1865 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1866
1867 /*
1868 * Automatically add the control class if it is not yet present and
1869 * the new control is not a compound control.
1870 */
1871 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1872 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1873 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1874 return hdl->error;
1875
1876 if (hdl->error)
1877 return hdl->error;
1878
1879 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1880 if (!new_ref)
1881 return handler_set_err(hdl, -ENOMEM);
1882 new_ref->ctrl = ctrl;
1883 if (ctrl->handler == hdl) {
1884 /* By default each control starts in a cluster of its own.
1885 new_ref->ctrl is basically a cluster array with one
1886 element, so that's perfect to use as the cluster pointer.
1887 But only do this for the handler that owns the control. */
1888 ctrl->cluster = &new_ref->ctrl;
1889 ctrl->ncontrols = 1;
1890 }
1891
1892 INIT_LIST_HEAD(&new_ref->node);
1893
1894 mutex_lock(hdl->lock);
1895
1896 /* Add immediately at the end of the list if the list is empty, or if
1897 the last element in the list has a lower ID.
1898 This ensures that when elements are added in ascending order the
1899 insertion is an O(1) operation. */
1900 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1901 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1902 goto insert_in_hash;
1903 }
1904
1905 /* Find insert position in sorted list */
1906 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1907 if (ref->ctrl->id < id)
1908 continue;
1909 /* Don't add duplicates */
1910 if (ref->ctrl->id == id) {
1911 kfree(new_ref);
1912 goto unlock;
1913 }
1914 list_add(&new_ref->node, ref->node.prev);
1915 break;
1916 }
1917
1918 insert_in_hash:
1919 /* Insert the control node in the hash */
1920 new_ref->next = hdl->buckets[bucket];
1921 hdl->buckets[bucket] = new_ref;
1922
1923 unlock:
1924 mutex_unlock(hdl->lock);
1925 return 0;
1926 }
1927
1928 /* Add a new control */
1929 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1930 const struct v4l2_ctrl_ops *ops,
1931 const struct v4l2_ctrl_type_ops *type_ops,
1932 u32 id, const char *name, enum v4l2_ctrl_type type,
1933 s64 min, s64 max, u64 step, s64 def,
1934 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1935 u32 flags, const char * const *qmenu,
1936 const s64 *qmenu_int, void *priv)
1937 {
1938 struct v4l2_ctrl *ctrl;
1939 unsigned sz_extra;
1940 unsigned nr_of_dims = 0;
1941 unsigned elems = 1;
1942 bool is_array;
1943 unsigned tot_ctrl_size;
1944 unsigned idx;
1945 void *data;
1946 int err;
1947
1948 if (hdl->error)
1949 return NULL;
1950
1951 while (dims && dims[nr_of_dims]) {
1952 elems *= dims[nr_of_dims];
1953 nr_of_dims++;
1954 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1955 break;
1956 }
1957 is_array = nr_of_dims > 0;
1958
1959 /* Prefill elem_size for all types handled by std_type_ops */
1960 switch (type) {
1961 case V4L2_CTRL_TYPE_INTEGER64:
1962 elem_size = sizeof(s64);
1963 break;
1964 case V4L2_CTRL_TYPE_STRING:
1965 elem_size = max + 1;
1966 break;
1967 case V4L2_CTRL_TYPE_U8:
1968 elem_size = sizeof(u8);
1969 break;
1970 case V4L2_CTRL_TYPE_U16:
1971 elem_size = sizeof(u16);
1972 break;
1973 case V4L2_CTRL_TYPE_U32:
1974 elem_size = sizeof(u32);
1975 break;
1976 default:
1977 if (type < V4L2_CTRL_COMPOUND_TYPES)
1978 elem_size = sizeof(s32);
1979 break;
1980 }
1981 tot_ctrl_size = elem_size * elems;
1982
1983 /* Sanity checks */
1984 if (id == 0 || name == NULL || !elem_size ||
1985 id >= V4L2_CID_PRIVATE_BASE ||
1986 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1987 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1988 handler_set_err(hdl, -ERANGE);
1989 return NULL;
1990 }
1991 err = check_range(type, min, max, step, def);
1992 if (err) {
1993 handler_set_err(hdl, err);
1994 return NULL;
1995 }
1996 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1997 handler_set_err(hdl, -ERANGE);
1998 return NULL;
1999 }
2000 if (is_array &&
2001 (type == V4L2_CTRL_TYPE_BUTTON ||
2002 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2003 handler_set_err(hdl, -EINVAL);
2004 return NULL;
2005 }
2006
2007 sz_extra = 0;
2008 if (type == V4L2_CTRL_TYPE_BUTTON)
2009 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2010 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2011 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2012 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2013 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2014 type == V4L2_CTRL_TYPE_STRING ||
2015 type >= V4L2_CTRL_COMPOUND_TYPES ||
2016 is_array)
2017 sz_extra += 2 * tot_ctrl_size;
2018
2019 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2020 if (ctrl == NULL) {
2021 handler_set_err(hdl, -ENOMEM);
2022 return NULL;
2023 }
2024
2025 INIT_LIST_HEAD(&ctrl->node);
2026 INIT_LIST_HEAD(&ctrl->ev_subs);
2027 ctrl->handler = hdl;
2028 ctrl->ops = ops;
2029 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2030 ctrl->id = id;
2031 ctrl->name = name;
2032 ctrl->type = type;
2033 ctrl->flags = flags;
2034 ctrl->minimum = min;
2035 ctrl->maximum = max;
2036 ctrl->step = step;
2037 ctrl->default_value = def;
2038 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2039 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2040 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2041 ctrl->is_array = is_array;
2042 ctrl->elems = elems;
2043 ctrl->nr_of_dims = nr_of_dims;
2044 if (nr_of_dims)
2045 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2046 ctrl->elem_size = elem_size;
2047 if (type == V4L2_CTRL_TYPE_MENU)
2048 ctrl->qmenu = qmenu;
2049 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2050 ctrl->qmenu_int = qmenu_int;
2051 ctrl->priv = priv;
2052 ctrl->cur.val = ctrl->val = def;
2053 data = &ctrl[1];
2054
2055 if (!ctrl->is_int) {
2056 ctrl->p_new.p = data;
2057 ctrl->p_cur.p = data + tot_ctrl_size;
2058 } else {
2059 ctrl->p_new.p = &ctrl->val;
2060 ctrl->p_cur.p = &ctrl->cur.val;
2061 }
2062 for (idx = 0; idx < elems; idx++) {
2063 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2064 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2065 }
2066
2067 if (handler_new_ref(hdl, ctrl)) {
2068 kfree(ctrl);
2069 return NULL;
2070 }
2071 mutex_lock(hdl->lock);
2072 list_add_tail(&ctrl->node, &hdl->ctrls);
2073 mutex_unlock(hdl->lock);
2074 return ctrl;
2075 }
2076
2077 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2078 const struct v4l2_ctrl_config *cfg, void *priv)
2079 {
2080 bool is_menu;
2081 struct v4l2_ctrl *ctrl;
2082 const char *name = cfg->name;
2083 const char * const *qmenu = cfg->qmenu;
2084 const s64 *qmenu_int = cfg->qmenu_int;
2085 enum v4l2_ctrl_type type = cfg->type;
2086 u32 flags = cfg->flags;
2087 s64 min = cfg->min;
2088 s64 max = cfg->max;
2089 u64 step = cfg->step;
2090 s64 def = cfg->def;
2091
2092 if (name == NULL)
2093 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2094 &def, &flags);
2095
2096 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2097 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2098 if (is_menu)
2099 WARN_ON(step);
2100 else
2101 WARN_ON(cfg->menu_skip_mask);
2102 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2103 qmenu = v4l2_ctrl_get_menu(cfg->id);
2104 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2105 qmenu_int == NULL) {
2106 handler_set_err(hdl, -EINVAL);
2107 return NULL;
2108 }
2109
2110 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2111 type, min, max,
2112 is_menu ? cfg->menu_skip_mask : step, def,
2113 cfg->dims, cfg->elem_size,
2114 flags, qmenu, qmenu_int, priv);
2115 if (ctrl)
2116 ctrl->is_private = cfg->is_private;
2117 return ctrl;
2118 }
2119 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2120
2121 /* Helper function for standard non-menu controls */
2122 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2123 const struct v4l2_ctrl_ops *ops,
2124 u32 id, s64 min, s64 max, u64 step, s64 def)
2125 {
2126 const char *name;
2127 enum v4l2_ctrl_type type;
2128 u32 flags;
2129
2130 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2131 if (type == V4L2_CTRL_TYPE_MENU ||
2132 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2133 type >= V4L2_CTRL_COMPOUND_TYPES) {
2134 handler_set_err(hdl, -EINVAL);
2135 return NULL;
2136 }
2137 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2138 min, max, step, def, NULL, 0,
2139 flags, NULL, NULL, NULL);
2140 }
2141 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2142
2143 /* Helper function for standard menu controls */
2144 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2145 const struct v4l2_ctrl_ops *ops,
2146 u32 id, u8 _max, u64 mask, u8 _def)
2147 {
2148 const char * const *qmenu = NULL;
2149 const s64 *qmenu_int = NULL;
2150 unsigned int qmenu_int_len = 0;
2151 const char *name;
2152 enum v4l2_ctrl_type type;
2153 s64 min;
2154 s64 max = _max;
2155 s64 def = _def;
2156 u64 step;
2157 u32 flags;
2158
2159 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2160
2161 if (type == V4L2_CTRL_TYPE_MENU)
2162 qmenu = v4l2_ctrl_get_menu(id);
2163 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2164 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2165
2166 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2167 handler_set_err(hdl, -EINVAL);
2168 return NULL;
2169 }
2170 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2171 0, max, mask, def, NULL, 0,
2172 flags, qmenu, qmenu_int, NULL);
2173 }
2174 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2175
2176 /* Helper function for standard menu controls with driver defined menu */
2177 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2178 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2179 u64 mask, u8 _def, const char * const *qmenu)
2180 {
2181 enum v4l2_ctrl_type type;
2182 const char *name;
2183 u32 flags;
2184 u64 step;
2185 s64 min;
2186 s64 max = _max;
2187 s64 def = _def;
2188
2189 /* v4l2_ctrl_new_std_menu_items() should only be called for
2190 * standard controls without a standard menu.
2191 */
2192 if (v4l2_ctrl_get_menu(id)) {
2193 handler_set_err(hdl, -EINVAL);
2194 return NULL;
2195 }
2196
2197 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2198 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2199 handler_set_err(hdl, -EINVAL);
2200 return NULL;
2201 }
2202 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2203 0, max, mask, def, NULL, 0,
2204 flags, qmenu, NULL, NULL);
2205
2206 }
2207 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2208
2209 /* Helper function for standard integer menu controls */
2210 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2211 const struct v4l2_ctrl_ops *ops,
2212 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2213 {
2214 const char *name;
2215 enum v4l2_ctrl_type type;
2216 s64 min;
2217 u64 step;
2218 s64 max = _max;
2219 s64 def = _def;
2220 u32 flags;
2221
2222 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2223 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2224 handler_set_err(hdl, -EINVAL);
2225 return NULL;
2226 }
2227 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2228 0, max, 0, def, NULL, 0,
2229 flags, NULL, qmenu_int, NULL);
2230 }
2231 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2232
2233 /* Add the controls from another handler to our own. */
2234 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2235 struct v4l2_ctrl_handler *add,
2236 bool (*filter)(const struct v4l2_ctrl *ctrl))
2237 {
2238 struct v4l2_ctrl_ref *ref;
2239 int ret = 0;
2240
2241 /* Do nothing if either handler is NULL or if they are the same */
2242 if (!hdl || !add || hdl == add)
2243 return 0;
2244 if (hdl->error)
2245 return hdl->error;
2246 mutex_lock(add->lock);
2247 list_for_each_entry(ref, &add->ctrl_refs, node) {
2248 struct v4l2_ctrl *ctrl = ref->ctrl;
2249
2250 /* Skip handler-private controls. */
2251 if (ctrl->is_private)
2252 continue;
2253 /* And control classes */
2254 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2255 continue;
2256 /* Filter any unwanted controls */
2257 if (filter && !filter(ctrl))
2258 continue;
2259 ret = handler_new_ref(hdl, ctrl);
2260 if (ret)
2261 break;
2262 }
2263 mutex_unlock(add->lock);
2264 return ret;
2265 }
2266 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2267
2268 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2269 {
2270 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2271 return true;
2272 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2273 return true;
2274 switch (ctrl->id) {
2275 case V4L2_CID_AUDIO_MUTE:
2276 case V4L2_CID_AUDIO_VOLUME:
2277 case V4L2_CID_AUDIO_BALANCE:
2278 case V4L2_CID_AUDIO_BASS:
2279 case V4L2_CID_AUDIO_TREBLE:
2280 case V4L2_CID_AUDIO_LOUDNESS:
2281 return true;
2282 default:
2283 break;
2284 }
2285 return false;
2286 }
2287 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2288
2289 /* Cluster controls */
2290 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2291 {
2292 bool has_volatiles = false;
2293 int i;
2294
2295 /* The first control is the master control and it must not be NULL */
2296 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2297 return;
2298
2299 for (i = 0; i < ncontrols; i++) {
2300 if (controls[i]) {
2301 controls[i]->cluster = controls;
2302 controls[i]->ncontrols = ncontrols;
2303 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2304 has_volatiles = true;
2305 }
2306 }
2307 controls[0]->has_volatiles = has_volatiles;
2308 }
2309 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2310
2311 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2312 u8 manual_val, bool set_volatile)
2313 {
2314 struct v4l2_ctrl *master = controls[0];
2315 u32 flag = 0;
2316 int i;
2317
2318 v4l2_ctrl_cluster(ncontrols, controls);
2319 WARN_ON(ncontrols <= 1);
2320 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2321 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2322 master->is_auto = true;
2323 master->has_volatiles = set_volatile;
2324 master->manual_mode_value = manual_val;
2325 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2326
2327 if (!is_cur_manual(master))
2328 flag = V4L2_CTRL_FLAG_INACTIVE |
2329 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2330
2331 for (i = 1; i < ncontrols; i++)
2332 if (controls[i])
2333 controls[i]->flags |= flag;
2334 }
2335 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2336
2337 /* Activate/deactivate a control. */
2338 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2339 {
2340 /* invert since the actual flag is called 'inactive' */
2341 bool inactive = !active;
2342 bool old;
2343
2344 if (ctrl == NULL)
2345 return;
2346
2347 if (inactive)
2348 /* set V4L2_CTRL_FLAG_INACTIVE */
2349 old = test_and_set_bit(4, &ctrl->flags);
2350 else
2351 /* clear V4L2_CTRL_FLAG_INACTIVE */
2352 old = test_and_clear_bit(4, &ctrl->flags);
2353 if (old != inactive)
2354 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2355 }
2356 EXPORT_SYMBOL(v4l2_ctrl_activate);
2357
2358 /* Grab/ungrab a control.
2359 Typically used when streaming starts and you want to grab controls,
2360 preventing the user from changing them.
2361
2362 Just call this and the framework will block any attempts to change
2363 these controls. */
2364 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2365 {
2366 bool old;
2367
2368 if (ctrl == NULL)
2369 return;
2370
2371 v4l2_ctrl_lock(ctrl);
2372 if (grabbed)
2373 /* set V4L2_CTRL_FLAG_GRABBED */
2374 old = test_and_set_bit(1, &ctrl->flags);
2375 else
2376 /* clear V4L2_CTRL_FLAG_GRABBED */
2377 old = test_and_clear_bit(1, &ctrl->flags);
2378 if (old != grabbed)
2379 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2380 v4l2_ctrl_unlock(ctrl);
2381 }
2382 EXPORT_SYMBOL(v4l2_ctrl_grab);
2383
2384 /* Log the control name and value */
2385 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2386 const char *prefix, const char *colon)
2387 {
2388 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2389 return;
2390 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2391 return;
2392
2393 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2394
2395 ctrl->type_ops->log(ctrl);
2396
2397 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2398 V4L2_CTRL_FLAG_GRABBED |
2399 V4L2_CTRL_FLAG_VOLATILE)) {
2400 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2401 pr_cont(" inactive");
2402 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2403 pr_cont(" grabbed");
2404 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2405 pr_cont(" volatile");
2406 }
2407 pr_cont("\n");
2408 }
2409
2410 /* Log all controls owned by the handler */
2411 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2412 const char *prefix)
2413 {
2414 struct v4l2_ctrl *ctrl;
2415 const char *colon = "";
2416 int len;
2417
2418 if (hdl == NULL)
2419 return;
2420 if (prefix == NULL)
2421 prefix = "";
2422 len = strlen(prefix);
2423 if (len && prefix[len - 1] != ' ')
2424 colon = ": ";
2425 mutex_lock(hdl->lock);
2426 list_for_each_entry(ctrl, &hdl->ctrls, node)
2427 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2428 log_ctrl(ctrl, prefix, colon);
2429 mutex_unlock(hdl->lock);
2430 }
2431 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2432
2433 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2434 {
2435 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2436 return 0;
2437 }
2438 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2439
2440 /* Call s_ctrl for all controls owned by the handler */
2441 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2442 {
2443 struct v4l2_ctrl *ctrl;
2444 int ret = 0;
2445
2446 if (hdl == NULL)
2447 return 0;
2448 mutex_lock(hdl->lock);
2449 list_for_each_entry(ctrl, &hdl->ctrls, node)
2450 ctrl->done = false;
2451
2452 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2453 struct v4l2_ctrl *master = ctrl->cluster[0];
2454 int i;
2455
2456 /* Skip if this control was already handled by a cluster. */
2457 /* Skip button controls and read-only controls. */
2458 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2459 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2460 continue;
2461
2462 for (i = 0; i < master->ncontrols; i++) {
2463 if (master->cluster[i]) {
2464 cur_to_new(master->cluster[i]);
2465 master->cluster[i]->is_new = 1;
2466 master->cluster[i]->done = true;
2467 }
2468 }
2469 ret = call_op(master, s_ctrl);
2470 if (ret)
2471 break;
2472 }
2473 mutex_unlock(hdl->lock);
2474 return ret;
2475 }
2476 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2477
2478 /* Implement VIDIOC_QUERY_EXT_CTRL */
2479 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2480 {
2481 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2482 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2483 struct v4l2_ctrl_ref *ref;
2484 struct v4l2_ctrl *ctrl;
2485
2486 if (hdl == NULL)
2487 return -EINVAL;
2488
2489 mutex_lock(hdl->lock);
2490
2491 /* Try to find it */
2492 ref = find_ref(hdl, id);
2493
2494 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2495 bool is_compound;
2496 /* Match any control that is not hidden */
2497 unsigned mask = 1;
2498 bool match = false;
2499
2500 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2501 /* Match any hidden control */
2502 match = true;
2503 } else if ((qc->id & next_flags) == next_flags) {
2504 /* Match any control, compound or not */
2505 mask = 0;
2506 }
2507
2508 /* Find the next control with ID > qc->id */
2509
2510 /* Did we reach the end of the control list? */
2511 if (id >= node2id(hdl->ctrl_refs.prev)) {
2512 ref = NULL; /* Yes, so there is no next control */
2513 } else if (ref) {
2514 /* We found a control with the given ID, so just get
2515 the next valid one in the list. */
2516 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2517 is_compound = ref->ctrl->is_array ||
2518 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2519 if (id < ref->ctrl->id &&
2520 (is_compound & mask) == match)
2521 break;
2522 }
2523 if (&ref->node == &hdl->ctrl_refs)
2524 ref = NULL;
2525 } else {
2526 /* No control with the given ID exists, so start
2527 searching for the next largest ID. We know there
2528 is one, otherwise the first 'if' above would have
2529 been true. */
2530 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2531 is_compound = ref->ctrl->is_array ||
2532 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2533 if (id < ref->ctrl->id &&
2534 (is_compound & mask) == match)
2535 break;
2536 }
2537 if (&ref->node == &hdl->ctrl_refs)
2538 ref = NULL;
2539 }
2540 }
2541 mutex_unlock(hdl->lock);
2542
2543 if (!ref)
2544 return -EINVAL;
2545
2546 ctrl = ref->ctrl;
2547 memset(qc, 0, sizeof(*qc));
2548 if (id >= V4L2_CID_PRIVATE_BASE)
2549 qc->id = id;
2550 else
2551 qc->id = ctrl->id;
2552 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2553 qc->flags = ctrl->flags;
2554 qc->type = ctrl->type;
2555 if (ctrl->is_ptr)
2556 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2557 qc->elem_size = ctrl->elem_size;
2558 qc->elems = ctrl->elems;
2559 qc->nr_of_dims = ctrl->nr_of_dims;
2560 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2561 qc->minimum = ctrl->minimum;
2562 qc->maximum = ctrl->maximum;
2563 qc->default_value = ctrl->default_value;
2564 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2565 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2566 qc->step = 1;
2567 else
2568 qc->step = ctrl->step;
2569 return 0;
2570 }
2571 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2572
2573 /* Implement VIDIOC_QUERYCTRL */
2574 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2575 {
2576 struct v4l2_query_ext_ctrl qec = { qc->id };
2577 int rc;
2578
2579 rc = v4l2_query_ext_ctrl(hdl, &qec);
2580 if (rc)
2581 return rc;
2582
2583 qc->id = qec.id;
2584 qc->type = qec.type;
2585 qc->flags = qec.flags;
2586 strlcpy(qc->name, qec.name, sizeof(qc->name));
2587 switch (qc->type) {
2588 case V4L2_CTRL_TYPE_INTEGER:
2589 case V4L2_CTRL_TYPE_BOOLEAN:
2590 case V4L2_CTRL_TYPE_MENU:
2591 case V4L2_CTRL_TYPE_INTEGER_MENU:
2592 case V4L2_CTRL_TYPE_STRING:
2593 case V4L2_CTRL_TYPE_BITMASK:
2594 qc->minimum = qec.minimum;
2595 qc->maximum = qec.maximum;
2596 qc->step = qec.step;
2597 qc->default_value = qec.default_value;
2598 break;
2599 default:
2600 qc->minimum = 0;
2601 qc->maximum = 0;
2602 qc->step = 0;
2603 qc->default_value = 0;
2604 break;
2605 }
2606 return 0;
2607 }
2608 EXPORT_SYMBOL(v4l2_queryctrl);
2609
2610 /* Implement VIDIOC_QUERYMENU */
2611 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2612 {
2613 struct v4l2_ctrl *ctrl;
2614 u32 i = qm->index;
2615
2616 ctrl = v4l2_ctrl_find(hdl, qm->id);
2617 if (!ctrl)
2618 return -EINVAL;
2619
2620 qm->reserved = 0;
2621 /* Sanity checks */
2622 switch (ctrl->type) {
2623 case V4L2_CTRL_TYPE_MENU:
2624 if (ctrl->qmenu == NULL)
2625 return -EINVAL;
2626 break;
2627 case V4L2_CTRL_TYPE_INTEGER_MENU:
2628 if (ctrl->qmenu_int == NULL)
2629 return -EINVAL;
2630 break;
2631 default:
2632 return -EINVAL;
2633 }
2634
2635 if (i < ctrl->minimum || i > ctrl->maximum)
2636 return -EINVAL;
2637
2638 /* Use mask to see if this menu item should be skipped */
2639 if (ctrl->menu_skip_mask & (1 << i))
2640 return -EINVAL;
2641 /* Empty menu items should also be skipped */
2642 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2643 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2644 return -EINVAL;
2645 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2646 } else {
2647 qm->value = ctrl->qmenu_int[i];
2648 }
2649 return 0;
2650 }
2651 EXPORT_SYMBOL(v4l2_querymenu);
2652
2653
2654 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2655
2656 It is not a fully atomic operation, just best-effort only. After all, if
2657 multiple controls have to be set through multiple i2c writes (for example)
2658 then some initial writes may succeed while others fail. Thus leaving the
2659 system in an inconsistent state. The question is how much effort you are
2660 willing to spend on trying to make something atomic that really isn't.
2661
2662 From the point of view of an application the main requirement is that
2663 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2664 error should be returned without actually affecting any controls.
2665
2666 If all the values are correct, then it is acceptable to just give up
2667 in case of low-level errors.
2668
2669 It is important though that the application can tell when only a partial
2670 configuration was done. The way we do that is through the error_idx field
2671 of struct v4l2_ext_controls: if that is equal to the count field then no
2672 controls were affected. Otherwise all controls before that index were
2673 successful in performing their 'get' or 'set' operation, the control at
2674 the given index failed, and you don't know what happened with the controls
2675 after the failed one. Since if they were part of a control cluster they
2676 could have been successfully processed (if a cluster member was encountered
2677 at index < error_idx), they could have failed (if a cluster member was at
2678 error_idx), or they may not have been processed yet (if the first cluster
2679 member appeared after error_idx).
2680
2681 It is all fairly theoretical, though. In practice all you can do is to
2682 bail out. If error_idx == count, then it is an application bug. If
2683 error_idx < count then it is only an application bug if the error code was
2684 EBUSY. That usually means that something started streaming just when you
2685 tried to set the controls. In all other cases it is a driver/hardware
2686 problem and all you can do is to retry or bail out.
2687
2688 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2689 never modifies controls the error_idx is just set to whatever control
2690 has an invalid value.
2691 */
2692
2693 /* Prepare for the extended g/s/try functions.
2694 Find the controls in the control array and do some basic checks. */
2695 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2696 struct v4l2_ext_controls *cs,
2697 struct v4l2_ctrl_helper *helpers,
2698 bool get)
2699 {
2700 struct v4l2_ctrl_helper *h;
2701 bool have_clusters = false;
2702 u32 i;
2703
2704 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2705 struct v4l2_ext_control *c = &cs->controls[i];
2706 struct v4l2_ctrl_ref *ref;
2707 struct v4l2_ctrl *ctrl;
2708 u32 id = c->id & V4L2_CTRL_ID_MASK;
2709
2710 cs->error_idx = i;
2711
2712 if (cs->which &&
2713 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2714 V4L2_CTRL_ID2WHICH(id) != cs->which)
2715 return -EINVAL;
2716
2717 /* Old-style private controls are not allowed for
2718 extended controls */
2719 if (id >= V4L2_CID_PRIVATE_BASE)
2720 return -EINVAL;
2721 ref = find_ref_lock(hdl, id);
2722 if (ref == NULL)
2723 return -EINVAL;
2724 ctrl = ref->ctrl;
2725 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2726 return -EINVAL;
2727
2728 if (ctrl->cluster[0]->ncontrols > 1)
2729 have_clusters = true;
2730 if (ctrl->cluster[0] != ctrl)
2731 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2732 if (ctrl->is_ptr && !ctrl->is_string) {
2733 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2734
2735 if (c->size < tot_size) {
2736 if (get) {
2737 c->size = tot_size;
2738 return -ENOSPC;
2739 }
2740 return -EFAULT;
2741 }
2742 c->size = tot_size;
2743 }
2744 /* Store the ref to the master control of the cluster */
2745 h->mref = ref;
2746 h->ctrl = ctrl;
2747 /* Initially set next to 0, meaning that there is no other
2748 control in this helper array belonging to the same
2749 cluster */
2750 h->next = 0;
2751 }
2752
2753 /* We are done if there were no controls that belong to a multi-
2754 control cluster. */
2755 if (!have_clusters)
2756 return 0;
2757
2758 /* The code below figures out in O(n) time which controls in the list
2759 belong to the same cluster. */
2760
2761 /* This has to be done with the handler lock taken. */
2762 mutex_lock(hdl->lock);
2763
2764 /* First zero the helper field in the master control references */
2765 for (i = 0; i < cs->count; i++)
2766 helpers[i].mref->helper = NULL;
2767 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2768 struct v4l2_ctrl_ref *mref = h->mref;
2769
2770 /* If the mref->helper is set, then it points to an earlier
2771 helper that belongs to the same cluster. */
2772 if (mref->helper) {
2773 /* Set the next field of mref->helper to the current
2774 index: this means that that earlier helper now
2775 points to the next helper in the same cluster. */
2776 mref->helper->next = i;
2777 /* mref should be set only for the first helper in the
2778 cluster, clear the others. */
2779 h->mref = NULL;
2780 }
2781 /* Point the mref helper to the current helper struct. */
2782 mref->helper = h;
2783 }
2784 mutex_unlock(hdl->lock);
2785 return 0;
2786 }
2787
2788 /* Handles the corner case where cs->count == 0. It checks whether the
2789 specified control class exists. If that class ID is 0, then it checks
2790 whether there are any controls at all. */
2791 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2792 {
2793 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2794 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2795 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2796 }
2797
2798
2799
2800 /* Get extended controls. Allocates the helpers array if needed. */
2801 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2802 {
2803 struct v4l2_ctrl_helper helper[4];
2804 struct v4l2_ctrl_helper *helpers = helper;
2805 int ret;
2806 int i, j;
2807 bool def_value;
2808
2809 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2810
2811 cs->error_idx = cs->count;
2812 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2813
2814 if (hdl == NULL)
2815 return -EINVAL;
2816
2817 if (cs->count == 0)
2818 return class_check(hdl, cs->which);
2819
2820 if (cs->count > ARRAY_SIZE(helper)) {
2821 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2822 GFP_KERNEL);
2823 if (helpers == NULL)
2824 return -ENOMEM;
2825 }
2826
2827 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2828 cs->error_idx = cs->count;
2829
2830 for (i = 0; !ret && i < cs->count; i++)
2831 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2832 ret = -EACCES;
2833
2834 for (i = 0; !ret && i < cs->count; i++) {
2835 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2836 struct v4l2_ctrl *ctrl);
2837 struct v4l2_ctrl *master;
2838
2839 ctrl_to_user = def_value ? def_to_user : cur_to_user;
2840
2841 if (helpers[i].mref == NULL)
2842 continue;
2843
2844 master = helpers[i].mref->ctrl;
2845 cs->error_idx = i;
2846
2847 v4l2_ctrl_lock(master);
2848
2849 /* g_volatile_ctrl will update the new control values */
2850 if (!def_value &&
2851 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2852 (master->has_volatiles && !is_cur_manual(master)))) {
2853 for (j = 0; j < master->ncontrols; j++)
2854 cur_to_new(master->cluster[j]);
2855 ret = call_op(master, g_volatile_ctrl);
2856 ctrl_to_user = new_to_user;
2857 }
2858 /* If OK, then copy the current (for non-volatile controls)
2859 or the new (for volatile controls) control values to the
2860 caller */
2861 if (!ret) {
2862 u32 idx = i;
2863
2864 do {
2865 ret = ctrl_to_user(cs->controls + idx,
2866 helpers[idx].ctrl);
2867 idx = helpers[idx].next;
2868 } while (!ret && idx);
2869 }
2870 v4l2_ctrl_unlock(master);
2871 }
2872
2873 if (cs->count > ARRAY_SIZE(helper))
2874 kfree(helpers);
2875 return ret;
2876 }
2877 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2878
2879 /* Helper function to get a single control */
2880 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2881 {
2882 struct v4l2_ctrl *master = ctrl->cluster[0];
2883 int ret = 0;
2884 int i;
2885
2886 /* Compound controls are not supported. The new_to_user() and
2887 * cur_to_user() calls below would need to be modified not to access
2888 * userspace memory when called from get_ctrl().
2889 */
2890 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2891 return -EINVAL;
2892
2893 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2894 return -EACCES;
2895
2896 v4l2_ctrl_lock(master);
2897 /* g_volatile_ctrl will update the current control values */
2898 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2899 for (i = 0; i < master->ncontrols; i++)
2900 cur_to_new(master->cluster[i]);
2901 ret = call_op(master, g_volatile_ctrl);
2902 new_to_user(c, ctrl);
2903 } else {
2904 cur_to_user(c, ctrl);
2905 }
2906 v4l2_ctrl_unlock(master);
2907 return ret;
2908 }
2909
2910 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2911 {
2912 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2913 struct v4l2_ext_control c;
2914 int ret;
2915
2916 if (ctrl == NULL || !ctrl->is_int)
2917 return -EINVAL;
2918 ret = get_ctrl(ctrl, &c);
2919 control->value = c.value;
2920 return ret;
2921 }
2922 EXPORT_SYMBOL(v4l2_g_ctrl);
2923
2924 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2925 {
2926 struct v4l2_ext_control c;
2927
2928 /* It's a driver bug if this happens. */
2929 WARN_ON(!ctrl->is_int);
2930 c.value = 0;
2931 get_ctrl(ctrl, &c);
2932 return c.value;
2933 }
2934 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2935
2936 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2937 {
2938 struct v4l2_ext_control c;
2939
2940 /* It's a driver bug if this happens. */
2941 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2942 c.value64 = 0;
2943 get_ctrl(ctrl, &c);
2944 return c.value64;
2945 }
2946 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2947
2948
2949 /* Core function that calls try/s_ctrl and ensures that the new value is
2950 copied to the current value on a set.
2951 Must be called with ctrl->handler->lock held. */
2952 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2953 bool set, u32 ch_flags)
2954 {
2955 bool update_flag;
2956 int ret;
2957 int i;
2958
2959 /* Go through the cluster and either validate the new value or
2960 (if no new value was set), copy the current value to the new
2961 value, ensuring a consistent view for the control ops when
2962 called. */
2963 for (i = 0; i < master->ncontrols; i++) {
2964 struct v4l2_ctrl *ctrl = master->cluster[i];
2965
2966 if (ctrl == NULL)
2967 continue;
2968
2969 if (!ctrl->is_new) {
2970 cur_to_new(ctrl);
2971 continue;
2972 }
2973 /* Check again: it may have changed since the
2974 previous check in try_or_set_ext_ctrls(). */
2975 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2976 return -EBUSY;
2977 }
2978
2979 ret = call_op(master, try_ctrl);
2980
2981 /* Don't set if there is no change */
2982 if (ret || !set || !cluster_changed(master))
2983 return ret;
2984 ret = call_op(master, s_ctrl);
2985 if (ret)
2986 return ret;
2987
2988 /* If OK, then make the new values permanent. */
2989 update_flag = is_cur_manual(master) != is_new_manual(master);
2990 for (i = 0; i < master->ncontrols; i++)
2991 new_to_cur(fh, master->cluster[i], ch_flags |
2992 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2993 return 0;
2994 }
2995
2996 /* Validate controls. */
2997 static int validate_ctrls(struct v4l2_ext_controls *cs,
2998 struct v4l2_ctrl_helper *helpers, bool set)
2999 {
3000 unsigned i;
3001 int ret = 0;
3002
3003 cs->error_idx = cs->count;
3004 for (i = 0; i < cs->count; i++) {
3005 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3006 union v4l2_ctrl_ptr p_new;
3007
3008 cs->error_idx = i;
3009
3010 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3011 return -EACCES;
3012 /* This test is also done in try_set_control_cluster() which
3013 is called in atomic context, so that has the final say,
3014 but it makes sense to do an up-front check as well. Once
3015 an error occurs in try_set_control_cluster() some other
3016 controls may have been set already and we want to do a
3017 best-effort to avoid that. */
3018 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3019 return -EBUSY;
3020 /*
3021 * Skip validation for now if the payload needs to be copied
3022 * from userspace into kernelspace. We'll validate those later.
3023 */
3024 if (ctrl->is_ptr)
3025 continue;
3026 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3027 p_new.p_s64 = &cs->controls[i].value64;
3028 else
3029 p_new.p_s32 = &cs->controls[i].value;
3030 ret = validate_new(ctrl, p_new);
3031 if (ret)
3032 return ret;
3033 }
3034 return 0;
3035 }
3036
3037 /* Obtain the current volatile values of an autocluster and mark them
3038 as new. */
3039 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3040 {
3041 int i;
3042
3043 for (i = 1; i < master->ncontrols; i++)
3044 cur_to_new(master->cluster[i]);
3045 if (!call_op(master, g_volatile_ctrl))
3046 for (i = 1; i < master->ncontrols; i++)
3047 if (master->cluster[i])
3048 master->cluster[i]->is_new = 1;
3049 }
3050
3051 /* Try or try-and-set controls */
3052 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3053 struct v4l2_ext_controls *cs,
3054 bool set)
3055 {
3056 struct v4l2_ctrl_helper helper[4];
3057 struct v4l2_ctrl_helper *helpers = helper;
3058 unsigned i, j;
3059 int ret;
3060
3061 cs->error_idx = cs->count;
3062
3063 /* Default value cannot be changed */
3064 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3065 return -EINVAL;
3066
3067 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3068
3069 if (hdl == NULL)
3070 return -EINVAL;
3071
3072 if (cs->count == 0)
3073 return class_check(hdl, cs->which);
3074
3075 if (cs->count > ARRAY_SIZE(helper)) {
3076 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3077 GFP_KERNEL);
3078 if (!helpers)
3079 return -ENOMEM;
3080 }
3081 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3082 if (!ret)
3083 ret = validate_ctrls(cs, helpers, set);
3084 if (ret && set)
3085 cs->error_idx = cs->count;
3086 for (i = 0; !ret && i < cs->count; i++) {
3087 struct v4l2_ctrl *master;
3088 u32 idx = i;
3089
3090 if (helpers[i].mref == NULL)
3091 continue;
3092
3093 cs->error_idx = i;
3094 master = helpers[i].mref->ctrl;
3095 v4l2_ctrl_lock(master);
3096
3097 /* Reset the 'is_new' flags of the cluster */
3098 for (j = 0; j < master->ncontrols; j++)
3099 if (master->cluster[j])
3100 master->cluster[j]->is_new = 0;
3101
3102 /* For volatile autoclusters that are currently in auto mode
3103 we need to discover if it will be set to manual mode.
3104 If so, then we have to copy the current volatile values
3105 first since those will become the new manual values (which
3106 may be overwritten by explicit new values from this set
3107 of controls). */
3108 if (master->is_auto && master->has_volatiles &&
3109 !is_cur_manual(master)) {
3110 /* Pick an initial non-manual value */
3111 s32 new_auto_val = master->manual_mode_value + 1;
3112 u32 tmp_idx = idx;
3113
3114 do {
3115 /* Check if the auto control is part of the
3116 list, and remember the new value. */
3117 if (helpers[tmp_idx].ctrl == master)
3118 new_auto_val = cs->controls[tmp_idx].value;
3119 tmp_idx = helpers[tmp_idx].next;
3120 } while (tmp_idx);
3121 /* If the new value == the manual value, then copy
3122 the current volatile values. */
3123 if (new_auto_val == master->manual_mode_value)
3124 update_from_auto_cluster(master);
3125 }
3126
3127 /* Copy the new caller-supplied control values.
3128 user_to_new() sets 'is_new' to 1. */
3129 do {
3130 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3131
3132 ret = user_to_new(cs->controls + idx, ctrl);
3133 if (!ret && ctrl->is_ptr)
3134 ret = validate_new(ctrl, ctrl->p_new);
3135 idx = helpers[idx].next;
3136 } while (!ret && idx);
3137
3138 if (!ret)
3139 ret = try_or_set_cluster(fh, master, set, 0);
3140
3141 /* Copy the new values back to userspace. */
3142 if (!ret) {
3143 idx = i;
3144 do {
3145 ret = new_to_user(cs->controls + idx,
3146 helpers[idx].ctrl);
3147 idx = helpers[idx].next;
3148 } while (!ret && idx);
3149 }
3150 v4l2_ctrl_unlock(master);
3151 }
3152
3153 if (cs->count > ARRAY_SIZE(helper))
3154 kfree(helpers);
3155 return ret;
3156 }
3157
3158 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3159 {
3160 return try_set_ext_ctrls(NULL, hdl, cs, false);
3161 }
3162 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3163
3164 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3165 struct v4l2_ext_controls *cs)
3166 {
3167 return try_set_ext_ctrls(fh, hdl, cs, true);
3168 }
3169 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3170
3171 /* Helper function for VIDIOC_S_CTRL compatibility */
3172 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3173 {
3174 struct v4l2_ctrl *master = ctrl->cluster[0];
3175 int ret;
3176 int i;
3177
3178 /* Reset the 'is_new' flags of the cluster */
3179 for (i = 0; i < master->ncontrols; i++)
3180 if (master->cluster[i])
3181 master->cluster[i]->is_new = 0;
3182
3183 ret = validate_new(ctrl, ctrl->p_new);
3184 if (ret)
3185 return ret;
3186
3187 /* For autoclusters with volatiles that are switched from auto to
3188 manual mode we have to update the current volatile values since
3189 those will become the initial manual values after such a switch. */
3190 if (master->is_auto && master->has_volatiles && ctrl == master &&
3191 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3192 update_from_auto_cluster(master);
3193
3194 ctrl->is_new = 1;
3195 return try_or_set_cluster(fh, master, true, ch_flags);
3196 }
3197
3198 /* Helper function for VIDIOC_S_CTRL compatibility */
3199 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3200 struct v4l2_ext_control *c)
3201 {
3202 int ret;
3203
3204 v4l2_ctrl_lock(ctrl);
3205 user_to_new(c, ctrl);
3206 ret = set_ctrl(fh, ctrl, 0);
3207 if (!ret)
3208 cur_to_user(c, ctrl);
3209 v4l2_ctrl_unlock(ctrl);
3210 return ret;
3211 }
3212
3213 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3214 struct v4l2_control *control)
3215 {
3216 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3217 struct v4l2_ext_control c = { control->id };
3218 int ret;
3219
3220 if (ctrl == NULL || !ctrl->is_int)
3221 return -EINVAL;
3222
3223 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3224 return -EACCES;
3225
3226 c.value = control->value;
3227 ret = set_ctrl_lock(fh, ctrl, &c);
3228 control->value = c.value;
3229 return ret;
3230 }
3231 EXPORT_SYMBOL(v4l2_s_ctrl);
3232
3233 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3234 {
3235 lockdep_assert_held(ctrl->handler->lock);
3236
3237 /* It's a driver bug if this happens. */
3238 WARN_ON(!ctrl->is_int);
3239 ctrl->val = val;
3240 return set_ctrl(NULL, ctrl, 0);
3241 }
3242 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3243
3244 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3245 {
3246 lockdep_assert_held(ctrl->handler->lock);
3247
3248 /* It's a driver bug if this happens. */
3249 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3250 *ctrl->p_new.p_s64 = val;
3251 return set_ctrl(NULL, ctrl, 0);
3252 }
3253 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3254
3255 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3256 {
3257 lockdep_assert_held(ctrl->handler->lock);
3258
3259 /* It's a driver bug if this happens. */
3260 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3261 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3262 return set_ctrl(NULL, ctrl, 0);
3263 }
3264 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3265
3266 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3267 {
3268 if (ctrl == NULL)
3269 return;
3270 if (notify == NULL) {
3271 ctrl->call_notify = 0;
3272 return;
3273 }
3274 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3275 return;
3276 ctrl->handler->notify = notify;
3277 ctrl->handler->notify_priv = priv;
3278 ctrl->call_notify = 1;
3279 }
3280 EXPORT_SYMBOL(v4l2_ctrl_notify);
3281
3282 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3283 s64 min, s64 max, u64 step, s64 def)
3284 {
3285 bool value_changed;
3286 bool range_changed = false;
3287 int ret;
3288
3289 lockdep_assert_held(ctrl->handler->lock);
3290
3291 switch (ctrl->type) {
3292 case V4L2_CTRL_TYPE_INTEGER:
3293 case V4L2_CTRL_TYPE_INTEGER64:
3294 case V4L2_CTRL_TYPE_BOOLEAN:
3295 case V4L2_CTRL_TYPE_MENU:
3296 case V4L2_CTRL_TYPE_INTEGER_MENU:
3297 case V4L2_CTRL_TYPE_BITMASK:
3298 case V4L2_CTRL_TYPE_U8:
3299 case V4L2_CTRL_TYPE_U16:
3300 case V4L2_CTRL_TYPE_U32:
3301 if (ctrl->is_array)
3302 return -EINVAL;
3303 ret = check_range(ctrl->type, min, max, step, def);
3304 if (ret)
3305 return ret;
3306 break;
3307 default:
3308 return -EINVAL;
3309 }
3310 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3311 (ctrl->step != step) || ctrl->default_value != def) {
3312 range_changed = true;
3313 ctrl->minimum = min;
3314 ctrl->maximum = max;
3315 ctrl->step = step;
3316 ctrl->default_value = def;
3317 }
3318 cur_to_new(ctrl);
3319 if (validate_new(ctrl, ctrl->p_new)) {
3320 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3321 *ctrl->p_new.p_s64 = def;
3322 else
3323 *ctrl->p_new.p_s32 = def;
3324 }
3325
3326 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3327 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3328 else
3329 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3330 if (value_changed)
3331 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3332 else if (range_changed)
3333 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3334 return ret;
3335 }
3336 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3337
3338 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3339 {
3340 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3341
3342 if (ctrl == NULL)
3343 return -EINVAL;
3344
3345 v4l2_ctrl_lock(ctrl);
3346 list_add_tail(&sev->node, &ctrl->ev_subs);
3347 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3348 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3349 struct v4l2_event ev;
3350 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3351
3352 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3353 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3354 fill_event(&ev, ctrl, changes);
3355 /* Mark the queue as active, allowing this initial
3356 event to be accepted. */
3357 sev->elems = elems;
3358 v4l2_event_queue_fh(sev->fh, &ev);
3359 }
3360 v4l2_ctrl_unlock(ctrl);
3361 return 0;
3362 }
3363
3364 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3365 {
3366 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3367
3368 v4l2_ctrl_lock(ctrl);
3369 list_del(&sev->node);
3370 v4l2_ctrl_unlock(ctrl);
3371 }
3372
3373 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3374 {
3375 u32 old_changes = old->u.ctrl.changes;
3376
3377 old->u.ctrl = new->u.ctrl;
3378 old->u.ctrl.changes |= old_changes;
3379 }
3380 EXPORT_SYMBOL(v4l2_ctrl_replace);
3381
3382 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3383 {
3384 new->u.ctrl.changes |= old->u.ctrl.changes;
3385 }
3386 EXPORT_SYMBOL(v4l2_ctrl_merge);
3387
3388 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3389 .add = v4l2_ctrl_add_event,
3390 .del = v4l2_ctrl_del_event,
3391 .replace = v4l2_ctrl_replace,
3392 .merge = v4l2_ctrl_merge,
3393 };
3394 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3395
3396 int v4l2_ctrl_log_status(struct file *file, void *fh)
3397 {
3398 struct video_device *vfd = video_devdata(file);
3399 struct v4l2_fh *vfh = file->private_data;
3400
3401 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3402 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3403 vfd->v4l2_dev->name);
3404 return 0;
3405 }
3406 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3407
3408 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3409 const struct v4l2_event_subscription *sub)
3410 {
3411 if (sub->type == V4L2_EVENT_CTRL)
3412 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3413 return -EINVAL;
3414 }
3415 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3416
3417 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3418 struct v4l2_event_subscription *sub)
3419 {
3420 if (!sd->ctrl_handler)
3421 return -EINVAL;
3422 return v4l2_ctrl_subscribe_event(fh, sub);
3423 }
3424 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3425
3426 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3427 {
3428 struct v4l2_fh *fh = file->private_data;
3429
3430 if (v4l2_event_pending(fh))
3431 return POLLPRI;
3432 poll_wait(file, &fh->wait, wait);
3433 return 0;
3434 }
3435 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux kernel - Deliverables
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