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Merge drm-fixes into drm-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 "Multiview High",
365 NULL,
366 };
367 static const char * const vui_sar_idc[] = {
368 "Unspecified",
369 "1:1",
370 "12:11",
371 "10:11",
372 "16:11",
373 "40:33",
374 "24:11",
375 "20:11",
376 "32:11",
377 "80:33",
378 "18:11",
379 "15:11",
380 "64:33",
381 "160:99",
382 "4:3",
383 "3:2",
384 "2:1",
385 "Extended SAR",
386 NULL,
387 };
388 static const char * const h264_fp_arrangement_type[] = {
389 "Checkerboard",
390 "Column",
391 "Row",
392 "Side by Side",
393 "Top Bottom",
394 "Temporal",
395 NULL,
396 };
397 static const char * const h264_fmo_map_type[] = {
398 "Interleaved Slices",
399 "Scattered Slices",
400 "Foreground with Leftover",
401 "Box Out",
402 "Raster Scan",
403 "Wipe Scan",
404 "Explicit",
405 NULL,
406 };
407 static const char * const mpeg_mpeg4_level[] = {
408 "0",
409 "0b",
410 "1",
411 "2",
412 "3",
413 "3b",
414 "4",
415 "5",
416 NULL,
417 };
418 static const char * const mpeg4_profile[] = {
419 "Simple",
420 "Advanced Simple",
421 "Core",
422 "Simple Scalable",
423 "Advanced Coding Efficiency",
424 NULL,
425 };
426
427 static const char * const vpx_golden_frame_sel[] = {
428 "Use Previous Frame",
429 "Use Previous Specific Frame",
430 NULL,
431 };
432
433 static const char * const flash_led_mode[] = {
434 "Off",
435 "Flash",
436 "Torch",
437 NULL,
438 };
439 static const char * const flash_strobe_source[] = {
440 "Software",
441 "External",
442 NULL,
443 };
444
445 static const char * const jpeg_chroma_subsampling[] = {
446 "4:4:4",
447 "4:2:2",
448 "4:2:0",
449 "4:1:1",
450 "4:1:0",
451 "Gray",
452 NULL,
453 };
454 static const char * const dv_tx_mode[] = {
455 "DVI-D",
456 "HDMI",
457 NULL,
458 };
459 static const char * const dv_rgb_range[] = {
460 "Automatic",
461 "RGB limited range (16-235)",
462 "RGB full range (0-255)",
463 NULL,
464 };
465 static const char * const dv_it_content_type[] = {
466 "Graphics",
467 "Photo",
468 "Cinema",
469 "Game",
470 "No IT Content",
471 NULL,
472 };
473 static const char * const detect_md_mode[] = {
474 "Disabled",
475 "Global",
476 "Threshold Grid",
477 "Region Grid",
478 NULL,
479 };
480
481
482 switch (id) {
483 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
484 return mpeg_audio_sampling_freq;
485 case V4L2_CID_MPEG_AUDIO_ENCODING:
486 return mpeg_audio_encoding;
487 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
488 return mpeg_audio_l1_bitrate;
489 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
490 return mpeg_audio_l2_bitrate;
491 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
492 return mpeg_audio_l3_bitrate;
493 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
494 return mpeg_audio_ac3_bitrate;
495 case V4L2_CID_MPEG_AUDIO_MODE:
496 return mpeg_audio_mode;
497 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
498 return mpeg_audio_mode_extension;
499 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
500 return mpeg_audio_emphasis;
501 case V4L2_CID_MPEG_AUDIO_CRC:
502 return mpeg_audio_crc;
503 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
504 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
505 return mpeg_audio_dec_playback;
506 case V4L2_CID_MPEG_VIDEO_ENCODING:
507 return mpeg_video_encoding;
508 case V4L2_CID_MPEG_VIDEO_ASPECT:
509 return mpeg_video_aspect;
510 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
511 return mpeg_video_bitrate_mode;
512 case V4L2_CID_MPEG_STREAM_TYPE:
513 return mpeg_stream_type;
514 case V4L2_CID_MPEG_STREAM_VBI_FMT:
515 return mpeg_stream_vbi_fmt;
516 case V4L2_CID_POWER_LINE_FREQUENCY:
517 return camera_power_line_frequency;
518 case V4L2_CID_EXPOSURE_AUTO:
519 return camera_exposure_auto;
520 case V4L2_CID_EXPOSURE_METERING:
521 return camera_exposure_metering;
522 case V4L2_CID_AUTO_FOCUS_RANGE:
523 return camera_auto_focus_range;
524 case V4L2_CID_COLORFX:
525 return colorfx;
526 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
527 return auto_n_preset_white_balance;
528 case V4L2_CID_ISO_SENSITIVITY_AUTO:
529 return camera_iso_sensitivity_auto;
530 case V4L2_CID_SCENE_MODE:
531 return scene_mode;
532 case V4L2_CID_TUNE_PREEMPHASIS:
533 return tune_emphasis;
534 case V4L2_CID_TUNE_DEEMPHASIS:
535 return tune_emphasis;
536 case V4L2_CID_FLASH_LED_MODE:
537 return flash_led_mode;
538 case V4L2_CID_FLASH_STROBE_SOURCE:
539 return flash_strobe_source;
540 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
541 return header_mode;
542 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
543 return multi_slice;
544 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
545 return entropy_mode;
546 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
547 return mpeg_h264_level;
548 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
549 return h264_loop_filter;
550 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
551 return h264_profile;
552 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
553 return vui_sar_idc;
554 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
555 return h264_fp_arrangement_type;
556 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
557 return h264_fmo_map_type;
558 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
559 return mpeg_mpeg4_level;
560 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
561 return mpeg4_profile;
562 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
563 return vpx_golden_frame_sel;
564 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
565 return jpeg_chroma_subsampling;
566 case V4L2_CID_DV_TX_MODE:
567 return dv_tx_mode;
568 case V4L2_CID_DV_TX_RGB_RANGE:
569 case V4L2_CID_DV_RX_RGB_RANGE:
570 return dv_rgb_range;
571 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
572 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
573 return dv_it_content_type;
574 case V4L2_CID_DETECT_MD_MODE:
575 return detect_md_mode;
576
577 default:
578 return NULL;
579 }
580 }
581 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
582
583 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
584 /*
585 * Returns NULL or an s64 type array containing the menu for given
586 * control ID. The total number of the menu items is returned in @len.
587 */
588 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
589 {
590 static const s64 qmenu_int_vpx_num_partitions[] = {
591 1, 2, 4, 8,
592 };
593
594 static const s64 qmenu_int_vpx_num_ref_frames[] = {
595 1, 2, 3,
596 };
597
598 switch (id) {
599 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
600 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
601 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
602 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
603 default:
604 *len = 0;
605 return NULL;
606 }
607 }
608 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
609
610 /* Return the control name. */
611 const char *v4l2_ctrl_get_name(u32 id)
612 {
613 switch (id) {
614 /* USER controls */
615 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
616 case V4L2_CID_USER_CLASS: return "User Controls";
617 case V4L2_CID_BRIGHTNESS: return "Brightness";
618 case V4L2_CID_CONTRAST: return "Contrast";
619 case V4L2_CID_SATURATION: return "Saturation";
620 case V4L2_CID_HUE: return "Hue";
621 case V4L2_CID_AUDIO_VOLUME: return "Volume";
622 case V4L2_CID_AUDIO_BALANCE: return "Balance";
623 case V4L2_CID_AUDIO_BASS: return "Bass";
624 case V4L2_CID_AUDIO_TREBLE: return "Treble";
625 case V4L2_CID_AUDIO_MUTE: return "Mute";
626 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
627 case V4L2_CID_BLACK_LEVEL: return "Black Level";
628 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
629 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
630 case V4L2_CID_RED_BALANCE: return "Red Balance";
631 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
632 case V4L2_CID_GAMMA: return "Gamma";
633 case V4L2_CID_EXPOSURE: return "Exposure";
634 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
635 case V4L2_CID_GAIN: return "Gain";
636 case V4L2_CID_HFLIP: return "Horizontal Flip";
637 case V4L2_CID_VFLIP: return "Vertical Flip";
638 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
639 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
640 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
641 case V4L2_CID_SHARPNESS: return "Sharpness";
642 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
643 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
644 case V4L2_CID_COLOR_KILLER: return "Color Killer";
645 case V4L2_CID_COLORFX: return "Color Effects";
646 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
647 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
648 case V4L2_CID_ROTATE: return "Rotate";
649 case V4L2_CID_BG_COLOR: return "Background Color";
650 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
651 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
652 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
653 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
654 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
655 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
656 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
657
658 /* Codec controls */
659 /* The MPEG controls are applicable to all codec controls
660 * and the 'MPEG' part of the define is historical */
661 /* Keep the order of the 'case's the same as in videodev2.h! */
662 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
663 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
664 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
665 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
666 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
667 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
668 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
669 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
670 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
671 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
672 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
673 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
674 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
675 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
676 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
677 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
678 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
679 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
680 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
681 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
682 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
683 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
684 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
685 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
686 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
687 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
688 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
689 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
690 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
691 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
692 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
693 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
694 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
695 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
696 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
697 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
698 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
699 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
700 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
701 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
702 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
703 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
704 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
705 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
706 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
707 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
708 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
709 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
710 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
711 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
712 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
713 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
714 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
715 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
716 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
717 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
718 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
719 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
720 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
721 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
722 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
723 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
724 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
725 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
726 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
727 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
728 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
729 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
730 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
731 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
732 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
733 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
734 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
735 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
736 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
737 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
738 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
739 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
740 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
741 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
742 return "H264 Set QP Value for HC Layers";
743 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
744 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
745 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
746 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
747 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
748 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
749 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
750 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
751 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
752 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
753 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
754 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
755 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
756 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
757 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
758 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
759 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
760 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
761 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
762
763 /* VPX controls */
764 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
765 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
766 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
767 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
768 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
769 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
770 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
771 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
772 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
773 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
774 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
775 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
776
777 /* CAMERA controls */
778 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
779 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
780 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
781 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
782 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
783 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
784 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
785 case V4L2_CID_PAN_RESET: return "Pan, Reset";
786 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
787 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
788 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
789 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
790 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
791 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
792 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
793 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
794 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
795 case V4L2_CID_PRIVACY: return "Privacy";
796 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
797 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
798 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
799 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
800 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
801 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
802 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
803 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
804 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
805 case V4L2_CID_SCENE_MODE: return "Scene Mode";
806 case V4L2_CID_3A_LOCK: return "3A Lock";
807 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
808 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
809 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
810 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
811 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
812 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
813
814 /* FM Radio Modulator controls */
815 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
816 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
817 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
818 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
819 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
820 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
821 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
822 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
823 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
824 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
825 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
826 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
827 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
828 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
829 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
830 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
831 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
832 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
833 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
834 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
835 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
836 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
837 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
838 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
839 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
840 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
841 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
842 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
843 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
844 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
845
846 /* Flash controls */
847 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
848 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
849 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
850 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
851 case V4L2_CID_FLASH_STROBE: return "Strobe";
852 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
853 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
854 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
855 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
856 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
857 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
858 case V4L2_CID_FLASH_FAULT: return "Faults";
859 case V4L2_CID_FLASH_CHARGE: return "Charge";
860 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
861
862 /* JPEG encoder controls */
863 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
864 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
865 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
866 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
867 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
868 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
869
870 /* Image source controls */
871 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
872 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
873 case V4L2_CID_VBLANK: return "Vertical Blanking";
874 case V4L2_CID_HBLANK: return "Horizontal Blanking";
875 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
876 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
877 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
878 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
879 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
880
881 /* Image processing controls */
882 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
883 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
884 case V4L2_CID_LINK_FREQ: return "Link Frequency";
885 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
886 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
887
888 /* DV controls */
889 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
890 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
891 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
892 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
893 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
894 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
895 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
896 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
897 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
898 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
899 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
900
901 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
902 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
903 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
904 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
905 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
906 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
907 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
908 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
909 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
910 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
911 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
912 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
913 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
914 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
915 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
916 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
917 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
918 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
919 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
920 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
921
922 /* Detection controls */
923 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
924 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
925 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
926 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
927 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
928 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
929 default:
930 return NULL;
931 }
932 }
933 EXPORT_SYMBOL(v4l2_ctrl_get_name);
934
935 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
936 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
937 {
938 *name = v4l2_ctrl_get_name(id);
939 *flags = 0;
940
941 switch (id) {
942 case V4L2_CID_AUDIO_MUTE:
943 case V4L2_CID_AUDIO_LOUDNESS:
944 case V4L2_CID_AUTO_WHITE_BALANCE:
945 case V4L2_CID_AUTOGAIN:
946 case V4L2_CID_HFLIP:
947 case V4L2_CID_VFLIP:
948 case V4L2_CID_HUE_AUTO:
949 case V4L2_CID_CHROMA_AGC:
950 case V4L2_CID_COLOR_KILLER:
951 case V4L2_CID_AUTOBRIGHTNESS:
952 case V4L2_CID_MPEG_AUDIO_MUTE:
953 case V4L2_CID_MPEG_VIDEO_MUTE:
954 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
955 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
956 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
957 case V4L2_CID_FOCUS_AUTO:
958 case V4L2_CID_PRIVACY:
959 case V4L2_CID_AUDIO_LIMITER_ENABLED:
960 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
961 case V4L2_CID_PILOT_TONE_ENABLED:
962 case V4L2_CID_ILLUMINATORS_1:
963 case V4L2_CID_ILLUMINATORS_2:
964 case V4L2_CID_FLASH_STROBE_STATUS:
965 case V4L2_CID_FLASH_CHARGE:
966 case V4L2_CID_FLASH_READY:
967 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
968 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
969 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
970 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
971 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
972 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
973 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
974 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
975 case V4L2_CID_WIDE_DYNAMIC_RANGE:
976 case V4L2_CID_IMAGE_STABILIZATION:
977 case V4L2_CID_RDS_RECEPTION:
978 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
979 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
980 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
981 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
982 case V4L2_CID_RF_TUNER_PLL_LOCK:
983 case V4L2_CID_RDS_TX_MONO_STEREO:
984 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
985 case V4L2_CID_RDS_TX_COMPRESSED:
986 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
987 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
988 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
989 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
990 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
991 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
992 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
993 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
994 *type = V4L2_CTRL_TYPE_BOOLEAN;
995 *min = 0;
996 *max = *step = 1;
997 break;
998 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
999 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1000 *type = V4L2_CTRL_TYPE_INTEGER;
1001 break;
1002 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1003 case V4L2_CID_PAN_RESET:
1004 case V4L2_CID_TILT_RESET:
1005 case V4L2_CID_FLASH_STROBE:
1006 case V4L2_CID_FLASH_STROBE_STOP:
1007 case V4L2_CID_AUTO_FOCUS_START:
1008 case V4L2_CID_AUTO_FOCUS_STOP:
1009 *type = V4L2_CTRL_TYPE_BUTTON;
1010 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1011 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1012 *min = *max = *step = *def = 0;
1013 break;
1014 case V4L2_CID_POWER_LINE_FREQUENCY:
1015 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1016 case V4L2_CID_MPEG_AUDIO_ENCODING:
1017 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1018 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1019 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1020 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1021 case V4L2_CID_MPEG_AUDIO_MODE:
1022 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1023 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1024 case V4L2_CID_MPEG_AUDIO_CRC:
1025 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1026 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1027 case V4L2_CID_MPEG_VIDEO_ENCODING:
1028 case V4L2_CID_MPEG_VIDEO_ASPECT:
1029 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1030 case V4L2_CID_MPEG_STREAM_TYPE:
1031 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1032 case V4L2_CID_EXPOSURE_AUTO:
1033 case V4L2_CID_AUTO_FOCUS_RANGE:
1034 case V4L2_CID_COLORFX:
1035 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1036 case V4L2_CID_TUNE_PREEMPHASIS:
1037 case V4L2_CID_FLASH_LED_MODE:
1038 case V4L2_CID_FLASH_STROBE_SOURCE:
1039 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1040 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1041 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1042 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1043 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1044 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1045 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1046 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1047 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1048 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1049 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1050 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1051 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1052 case V4L2_CID_EXPOSURE_METERING:
1053 case V4L2_CID_SCENE_MODE:
1054 case V4L2_CID_DV_TX_MODE:
1055 case V4L2_CID_DV_TX_RGB_RANGE:
1056 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1057 case V4L2_CID_DV_RX_RGB_RANGE:
1058 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1059 case V4L2_CID_TEST_PATTERN:
1060 case V4L2_CID_TUNE_DEEMPHASIS:
1061 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1062 case V4L2_CID_DETECT_MD_MODE:
1063 *type = V4L2_CTRL_TYPE_MENU;
1064 break;
1065 case V4L2_CID_LINK_FREQ:
1066 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1067 break;
1068 case V4L2_CID_RDS_TX_PS_NAME:
1069 case V4L2_CID_RDS_TX_RADIO_TEXT:
1070 case V4L2_CID_RDS_RX_PS_NAME:
1071 case V4L2_CID_RDS_RX_RADIO_TEXT:
1072 *type = V4L2_CTRL_TYPE_STRING;
1073 break;
1074 case V4L2_CID_ISO_SENSITIVITY:
1075 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1076 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1077 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1078 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1079 break;
1080 case V4L2_CID_USER_CLASS:
1081 case V4L2_CID_CAMERA_CLASS:
1082 case V4L2_CID_MPEG_CLASS:
1083 case V4L2_CID_FM_TX_CLASS:
1084 case V4L2_CID_FLASH_CLASS:
1085 case V4L2_CID_JPEG_CLASS:
1086 case V4L2_CID_IMAGE_SOURCE_CLASS:
1087 case V4L2_CID_IMAGE_PROC_CLASS:
1088 case V4L2_CID_DV_CLASS:
1089 case V4L2_CID_FM_RX_CLASS:
1090 case V4L2_CID_RF_TUNER_CLASS:
1091 case V4L2_CID_DETECT_CLASS:
1092 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1093 /* You can neither read not write these */
1094 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1095 *min = *max = *step = *def = 0;
1096 break;
1097 case V4L2_CID_BG_COLOR:
1098 *type = V4L2_CTRL_TYPE_INTEGER;
1099 *step = 1;
1100 *min = 0;
1101 /* Max is calculated as RGB888 that is 2^24 */
1102 *max = 0xFFFFFF;
1103 break;
1104 case V4L2_CID_FLASH_FAULT:
1105 case V4L2_CID_JPEG_ACTIVE_MARKER:
1106 case V4L2_CID_3A_LOCK:
1107 case V4L2_CID_AUTO_FOCUS_STATUS:
1108 case V4L2_CID_DV_TX_HOTPLUG:
1109 case V4L2_CID_DV_TX_RXSENSE:
1110 case V4L2_CID_DV_TX_EDID_PRESENT:
1111 case V4L2_CID_DV_RX_POWER_PRESENT:
1112 *type = V4L2_CTRL_TYPE_BITMASK;
1113 break;
1114 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1115 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1116 *type = V4L2_CTRL_TYPE_INTEGER;
1117 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1118 break;
1119 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1120 *type = V4L2_CTRL_TYPE_INTEGER64;
1121 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1122 *min = *def = 0;
1123 *max = 0x1ffffffffLL;
1124 *step = 1;
1125 break;
1126 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1127 *type = V4L2_CTRL_TYPE_INTEGER64;
1128 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1129 *min = *def = 0;
1130 *max = 0x7fffffffffffffffLL;
1131 *step = 1;
1132 break;
1133 case V4L2_CID_PIXEL_RATE:
1134 *type = V4L2_CTRL_TYPE_INTEGER64;
1135 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1136 break;
1137 case V4L2_CID_DETECT_MD_REGION_GRID:
1138 *type = V4L2_CTRL_TYPE_U8;
1139 break;
1140 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1141 *type = V4L2_CTRL_TYPE_U16;
1142 break;
1143 case V4L2_CID_RDS_TX_ALT_FREQS:
1144 *type = V4L2_CTRL_TYPE_U32;
1145 break;
1146 default:
1147 *type = V4L2_CTRL_TYPE_INTEGER;
1148 break;
1149 }
1150 switch (id) {
1151 case V4L2_CID_MPEG_AUDIO_ENCODING:
1152 case V4L2_CID_MPEG_AUDIO_MODE:
1153 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1154 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1155 case V4L2_CID_MPEG_STREAM_TYPE:
1156 *flags |= V4L2_CTRL_FLAG_UPDATE;
1157 break;
1158 case V4L2_CID_AUDIO_VOLUME:
1159 case V4L2_CID_AUDIO_BALANCE:
1160 case V4L2_CID_AUDIO_BASS:
1161 case V4L2_CID_AUDIO_TREBLE:
1162 case V4L2_CID_BRIGHTNESS:
1163 case V4L2_CID_CONTRAST:
1164 case V4L2_CID_SATURATION:
1165 case V4L2_CID_HUE:
1166 case V4L2_CID_RED_BALANCE:
1167 case V4L2_CID_BLUE_BALANCE:
1168 case V4L2_CID_GAMMA:
1169 case V4L2_CID_SHARPNESS:
1170 case V4L2_CID_CHROMA_GAIN:
1171 case V4L2_CID_RDS_TX_DEVIATION:
1172 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1173 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1174 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1175 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1176 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1177 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1178 case V4L2_CID_PILOT_TONE_DEVIATION:
1179 case V4L2_CID_PILOT_TONE_FREQUENCY:
1180 case V4L2_CID_TUNE_POWER_LEVEL:
1181 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1182 case V4L2_CID_RF_TUNER_RF_GAIN:
1183 case V4L2_CID_RF_TUNER_LNA_GAIN:
1184 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1185 case V4L2_CID_RF_TUNER_IF_GAIN:
1186 case V4L2_CID_RF_TUNER_BANDWIDTH:
1187 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1188 *flags |= V4L2_CTRL_FLAG_SLIDER;
1189 break;
1190 case V4L2_CID_PAN_RELATIVE:
1191 case V4L2_CID_TILT_RELATIVE:
1192 case V4L2_CID_FOCUS_RELATIVE:
1193 case V4L2_CID_IRIS_RELATIVE:
1194 case V4L2_CID_ZOOM_RELATIVE:
1195 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1196 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1197 break;
1198 case V4L2_CID_FLASH_STROBE_STATUS:
1199 case V4L2_CID_AUTO_FOCUS_STATUS:
1200 case V4L2_CID_FLASH_READY:
1201 case V4L2_CID_DV_TX_HOTPLUG:
1202 case V4L2_CID_DV_TX_RXSENSE:
1203 case V4L2_CID_DV_TX_EDID_PRESENT:
1204 case V4L2_CID_DV_RX_POWER_PRESENT:
1205 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1206 case V4L2_CID_RDS_RX_PTY:
1207 case V4L2_CID_RDS_RX_PS_NAME:
1208 case V4L2_CID_RDS_RX_RADIO_TEXT:
1209 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1210 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1211 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1212 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1213 break;
1214 case V4L2_CID_RF_TUNER_PLL_LOCK:
1215 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1216 break;
1217 }
1218 }
1219 EXPORT_SYMBOL(v4l2_ctrl_fill);
1220
1221 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1222 {
1223 memset(ev->reserved, 0, sizeof(ev->reserved));
1224 ev->type = V4L2_EVENT_CTRL;
1225 ev->id = ctrl->id;
1226 ev->u.ctrl.changes = changes;
1227 ev->u.ctrl.type = ctrl->type;
1228 ev->u.ctrl.flags = ctrl->flags;
1229 if (ctrl->is_ptr)
1230 ev->u.ctrl.value64 = 0;
1231 else
1232 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1233 ev->u.ctrl.minimum = ctrl->minimum;
1234 ev->u.ctrl.maximum = ctrl->maximum;
1235 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1236 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1237 ev->u.ctrl.step = 1;
1238 else
1239 ev->u.ctrl.step = ctrl->step;
1240 ev->u.ctrl.default_value = ctrl->default_value;
1241 }
1242
1243 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1244 {
1245 struct v4l2_event ev;
1246 struct v4l2_subscribed_event *sev;
1247
1248 if (list_empty(&ctrl->ev_subs))
1249 return;
1250 fill_event(&ev, ctrl, changes);
1251
1252 list_for_each_entry(sev, &ctrl->ev_subs, node)
1253 if (sev->fh != fh ||
1254 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1255 v4l2_event_queue_fh(sev->fh, &ev);
1256 }
1257
1258 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1259 union v4l2_ctrl_ptr ptr1,
1260 union v4l2_ctrl_ptr ptr2)
1261 {
1262 switch (ctrl->type) {
1263 case V4L2_CTRL_TYPE_BUTTON:
1264 return false;
1265 case V4L2_CTRL_TYPE_STRING:
1266 idx *= ctrl->elem_size;
1267 /* strings are always 0-terminated */
1268 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1269 case V4L2_CTRL_TYPE_INTEGER64:
1270 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1271 case V4L2_CTRL_TYPE_U8:
1272 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1273 case V4L2_CTRL_TYPE_U16:
1274 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1275 case V4L2_CTRL_TYPE_U32:
1276 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1277 default:
1278 if (ctrl->is_int)
1279 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1280 idx *= ctrl->elem_size;
1281 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1282 }
1283 }
1284
1285 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1286 union v4l2_ctrl_ptr ptr)
1287 {
1288 switch (ctrl->type) {
1289 case V4L2_CTRL_TYPE_STRING:
1290 idx *= ctrl->elem_size;
1291 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1292 ptr.p_char[idx + ctrl->minimum] = '\0';
1293 break;
1294 case V4L2_CTRL_TYPE_INTEGER64:
1295 ptr.p_s64[idx] = ctrl->default_value;
1296 break;
1297 case V4L2_CTRL_TYPE_INTEGER:
1298 case V4L2_CTRL_TYPE_INTEGER_MENU:
1299 case V4L2_CTRL_TYPE_MENU:
1300 case V4L2_CTRL_TYPE_BITMASK:
1301 case V4L2_CTRL_TYPE_BOOLEAN:
1302 ptr.p_s32[idx] = ctrl->default_value;
1303 break;
1304 case V4L2_CTRL_TYPE_U8:
1305 ptr.p_u8[idx] = ctrl->default_value;
1306 break;
1307 case V4L2_CTRL_TYPE_U16:
1308 ptr.p_u16[idx] = ctrl->default_value;
1309 break;
1310 case V4L2_CTRL_TYPE_U32:
1311 ptr.p_u32[idx] = ctrl->default_value;
1312 break;
1313 default:
1314 idx *= ctrl->elem_size;
1315 memset(ptr.p + idx, 0, ctrl->elem_size);
1316 break;
1317 }
1318 }
1319
1320 static void std_log(const struct v4l2_ctrl *ctrl)
1321 {
1322 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1323
1324 if (ctrl->is_array) {
1325 unsigned i;
1326
1327 for (i = 0; i < ctrl->nr_of_dims; i++)
1328 pr_cont("[%u]", ctrl->dims[i]);
1329 pr_cont(" ");
1330 }
1331
1332 switch (ctrl->type) {
1333 case V4L2_CTRL_TYPE_INTEGER:
1334 pr_cont("%d", *ptr.p_s32);
1335 break;
1336 case V4L2_CTRL_TYPE_BOOLEAN:
1337 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1338 break;
1339 case V4L2_CTRL_TYPE_MENU:
1340 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1341 break;
1342 case V4L2_CTRL_TYPE_INTEGER_MENU:
1343 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1344 break;
1345 case V4L2_CTRL_TYPE_BITMASK:
1346 pr_cont("0x%08x", *ptr.p_s32);
1347 break;
1348 case V4L2_CTRL_TYPE_INTEGER64:
1349 pr_cont("%lld", *ptr.p_s64);
1350 break;
1351 case V4L2_CTRL_TYPE_STRING:
1352 pr_cont("%s", ptr.p_char);
1353 break;
1354 case V4L2_CTRL_TYPE_U8:
1355 pr_cont("%u", (unsigned)*ptr.p_u8);
1356 break;
1357 case V4L2_CTRL_TYPE_U16:
1358 pr_cont("%u", (unsigned)*ptr.p_u16);
1359 break;
1360 case V4L2_CTRL_TYPE_U32:
1361 pr_cont("%u", (unsigned)*ptr.p_u32);
1362 break;
1363 default:
1364 pr_cont("unknown type %d", ctrl->type);
1365 break;
1366 }
1367 }
1368
1369 /*
1370 * Round towards the closest legal value. Be careful when we are
1371 * close to the maximum range of the control type to prevent
1372 * wrap-arounds.
1373 */
1374 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1375 ({ \
1376 offset_type offset; \
1377 if ((ctrl)->maximum >= 0 && \
1378 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1379 val = (ctrl)->maximum; \
1380 else \
1381 val += (s32)((ctrl)->step / 2); \
1382 val = clamp_t(typeof(val), val, \
1383 (ctrl)->minimum, (ctrl)->maximum); \
1384 offset = (val) - (ctrl)->minimum; \
1385 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1386 val = (ctrl)->minimum + offset; \
1387 0; \
1388 })
1389
1390 /* Validate a new control */
1391 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1392 union v4l2_ctrl_ptr ptr)
1393 {
1394 size_t len;
1395 u64 offset;
1396 s64 val;
1397
1398 switch (ctrl->type) {
1399 case V4L2_CTRL_TYPE_INTEGER:
1400 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1401 case V4L2_CTRL_TYPE_INTEGER64:
1402 /*
1403 * We can't use the ROUND_TO_RANGE define here due to
1404 * the u64 divide that needs special care.
1405 */
1406 val = ptr.p_s64[idx];
1407 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1408 val = ctrl->maximum;
1409 else
1410 val += (s64)(ctrl->step / 2);
1411 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1412 offset = val - ctrl->minimum;
1413 do_div(offset, ctrl->step);
1414 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1415 return 0;
1416 case V4L2_CTRL_TYPE_U8:
1417 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1418 case V4L2_CTRL_TYPE_U16:
1419 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1420 case V4L2_CTRL_TYPE_U32:
1421 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1422
1423 case V4L2_CTRL_TYPE_BOOLEAN:
1424 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1425 return 0;
1426
1427 case V4L2_CTRL_TYPE_MENU:
1428 case V4L2_CTRL_TYPE_INTEGER_MENU:
1429 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1430 return -ERANGE;
1431 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1432 return -EINVAL;
1433 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1434 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1435 return -EINVAL;
1436 return 0;
1437
1438 case V4L2_CTRL_TYPE_BITMASK:
1439 ptr.p_s32[idx] &= ctrl->maximum;
1440 return 0;
1441
1442 case V4L2_CTRL_TYPE_BUTTON:
1443 case V4L2_CTRL_TYPE_CTRL_CLASS:
1444 ptr.p_s32[idx] = 0;
1445 return 0;
1446
1447 case V4L2_CTRL_TYPE_STRING:
1448 idx *= ctrl->elem_size;
1449 len = strlen(ptr.p_char + idx);
1450 if (len < ctrl->minimum)
1451 return -ERANGE;
1452 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1453 return -ERANGE;
1454 return 0;
1455
1456 default:
1457 return -EINVAL;
1458 }
1459 }
1460
1461 static const struct v4l2_ctrl_type_ops std_type_ops = {
1462 .equal = std_equal,
1463 .init = std_init,
1464 .log = std_log,
1465 .validate = std_validate,
1466 };
1467
1468 /* Helper function: copy the given control value back to the caller */
1469 static int ptr_to_user(struct v4l2_ext_control *c,
1470 struct v4l2_ctrl *ctrl,
1471 union v4l2_ctrl_ptr ptr)
1472 {
1473 u32 len;
1474
1475 if (ctrl->is_ptr && !ctrl->is_string)
1476 return copy_to_user(c->ptr, ptr.p, c->size) ?
1477 -EFAULT : 0;
1478
1479 switch (ctrl->type) {
1480 case V4L2_CTRL_TYPE_STRING:
1481 len = strlen(ptr.p_char);
1482 if (c->size < len + 1) {
1483 c->size = ctrl->elem_size;
1484 return -ENOSPC;
1485 }
1486 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1487 -EFAULT : 0;
1488 case V4L2_CTRL_TYPE_INTEGER64:
1489 c->value64 = *ptr.p_s64;
1490 break;
1491 default:
1492 c->value = *ptr.p_s32;
1493 break;
1494 }
1495 return 0;
1496 }
1497
1498 /* Helper function: copy the current control value back to the caller */
1499 static int cur_to_user(struct v4l2_ext_control *c,
1500 struct v4l2_ctrl *ctrl)
1501 {
1502 return ptr_to_user(c, ctrl, ctrl->p_cur);
1503 }
1504
1505 /* Helper function: copy the new control value back to the caller */
1506 static int new_to_user(struct v4l2_ext_control *c,
1507 struct v4l2_ctrl *ctrl)
1508 {
1509 return ptr_to_user(c, ctrl, ctrl->p_new);
1510 }
1511
1512 /* Helper function: copy the initial control value back to the caller */
1513 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1514 {
1515 int idx;
1516
1517 for (idx = 0; idx < ctrl->elems; idx++)
1518 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1519
1520 return ptr_to_user(c, ctrl, ctrl->p_new);
1521 }
1522
1523 /* Helper function: copy the caller-provider value to the given control value */
1524 static int user_to_ptr(struct v4l2_ext_control *c,
1525 struct v4l2_ctrl *ctrl,
1526 union v4l2_ctrl_ptr ptr)
1527 {
1528 int ret;
1529 u32 size;
1530
1531 ctrl->is_new = 1;
1532 if (ctrl->is_ptr && !ctrl->is_string) {
1533 unsigned idx;
1534
1535 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1536 if (ret || !ctrl->is_array)
1537 return ret;
1538 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1539 ctrl->type_ops->init(ctrl, idx, ptr);
1540 return 0;
1541 }
1542
1543 switch (ctrl->type) {
1544 case V4L2_CTRL_TYPE_INTEGER64:
1545 *ptr.p_s64 = c->value64;
1546 break;
1547 case V4L2_CTRL_TYPE_STRING:
1548 size = c->size;
1549 if (size == 0)
1550 return -ERANGE;
1551 if (size > ctrl->maximum + 1)
1552 size = ctrl->maximum + 1;
1553 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1554 if (!ret) {
1555 char last = ptr.p_char[size - 1];
1556
1557 ptr.p_char[size - 1] = 0;
1558 /* If the string was longer than ctrl->maximum,
1559 then return an error. */
1560 if (strlen(ptr.p_char) == ctrl->maximum && last)
1561 return -ERANGE;
1562 }
1563 return ret;
1564 default:
1565 *ptr.p_s32 = c->value;
1566 break;
1567 }
1568 return 0;
1569 }
1570
1571 /* Helper function: copy the caller-provider value as the new control value */
1572 static int user_to_new(struct v4l2_ext_control *c,
1573 struct v4l2_ctrl *ctrl)
1574 {
1575 return user_to_ptr(c, ctrl, ctrl->p_new);
1576 }
1577
1578 /* Copy the one value to another. */
1579 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1580 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1581 {
1582 if (ctrl == NULL)
1583 return;
1584 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1585 }
1586
1587 /* Copy the new value to the current value. */
1588 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1589 {
1590 bool changed;
1591
1592 if (ctrl == NULL)
1593 return;
1594
1595 /* has_changed is set by cluster_changed */
1596 changed = ctrl->has_changed;
1597 if (changed)
1598 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1599
1600 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1601 /* Note: CH_FLAGS is only set for auto clusters. */
1602 ctrl->flags &=
1603 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1604 if (!is_cur_manual(ctrl->cluster[0])) {
1605 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1606 if (ctrl->cluster[0]->has_volatiles)
1607 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1608 }
1609 fh = NULL;
1610 }
1611 if (changed || ch_flags) {
1612 /* If a control was changed that was not one of the controls
1613 modified by the application, then send the event to all. */
1614 if (!ctrl->is_new)
1615 fh = NULL;
1616 send_event(fh, ctrl,
1617 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1618 if (ctrl->call_notify && changed && ctrl->handler->notify)
1619 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1620 }
1621 }
1622
1623 /* Copy the current value to the new value */
1624 static void cur_to_new(struct v4l2_ctrl *ctrl)
1625 {
1626 if (ctrl == NULL)
1627 return;
1628 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1629 }
1630
1631 /* Return non-zero if one or more of the controls in the cluster has a new
1632 value that differs from the current value. */
1633 static int cluster_changed(struct v4l2_ctrl *master)
1634 {
1635 bool changed = false;
1636 unsigned idx;
1637 int i;
1638
1639 for (i = 0; i < master->ncontrols; i++) {
1640 struct v4l2_ctrl *ctrl = master->cluster[i];
1641 bool ctrl_changed = false;
1642
1643 if (ctrl == NULL)
1644 continue;
1645
1646 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1647 changed = ctrl_changed = true;
1648
1649 /*
1650 * Set has_changed to false to avoid generating
1651 * the event V4L2_EVENT_CTRL_CH_VALUE
1652 */
1653 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1654 ctrl->has_changed = false;
1655 continue;
1656 }
1657
1658 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1659 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1660 ctrl->p_cur, ctrl->p_new);
1661 ctrl->has_changed = ctrl_changed;
1662 changed |= ctrl->has_changed;
1663 }
1664 return changed;
1665 }
1666
1667 /* Control range checking */
1668 static int check_range(enum v4l2_ctrl_type type,
1669 s64 min, s64 max, u64 step, s64 def)
1670 {
1671 switch (type) {
1672 case V4L2_CTRL_TYPE_BOOLEAN:
1673 if (step != 1 || max > 1 || min < 0)
1674 return -ERANGE;
1675 /* fall through */
1676 case V4L2_CTRL_TYPE_U8:
1677 case V4L2_CTRL_TYPE_U16:
1678 case V4L2_CTRL_TYPE_U32:
1679 case V4L2_CTRL_TYPE_INTEGER:
1680 case V4L2_CTRL_TYPE_INTEGER64:
1681 if (step == 0 || min > max || def < min || def > max)
1682 return -ERANGE;
1683 return 0;
1684 case V4L2_CTRL_TYPE_BITMASK:
1685 if (step || min || !max || (def & ~max))
1686 return -ERANGE;
1687 return 0;
1688 case V4L2_CTRL_TYPE_MENU:
1689 case V4L2_CTRL_TYPE_INTEGER_MENU:
1690 if (min > max || def < min || def > max)
1691 return -ERANGE;
1692 /* Note: step == menu_skip_mask for menu controls.
1693 So here we check if the default value is masked out. */
1694 if (step && ((1 << def) & step))
1695 return -EINVAL;
1696 return 0;
1697 case V4L2_CTRL_TYPE_STRING:
1698 if (min > max || min < 0 || step < 1 || def)
1699 return -ERANGE;
1700 return 0;
1701 default:
1702 return 0;
1703 }
1704 }
1705
1706 /* Validate a new control */
1707 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1708 {
1709 unsigned idx;
1710 int err = 0;
1711
1712 for (idx = 0; !err && idx < ctrl->elems; idx++)
1713 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1714 return err;
1715 }
1716
1717 static inline u32 node2id(struct list_head *node)
1718 {
1719 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1720 }
1721
1722 /* Set the handler's error code if it wasn't set earlier already */
1723 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1724 {
1725 if (hdl->error == 0)
1726 hdl->error = err;
1727 return err;
1728 }
1729
1730 /* Initialize the handler */
1731 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1732 unsigned nr_of_controls_hint,
1733 struct lock_class_key *key, const char *name)
1734 {
1735 hdl->lock = &hdl->_lock;
1736 mutex_init(hdl->lock);
1737 lockdep_set_class_and_name(hdl->lock, key, name);
1738 INIT_LIST_HEAD(&hdl->ctrls);
1739 INIT_LIST_HEAD(&hdl->ctrl_refs);
1740 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1741 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1742 GFP_KERNEL);
1743 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1744 return hdl->error;
1745 }
1746 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1747
1748 /* Free all controls and control refs */
1749 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1750 {
1751 struct v4l2_ctrl_ref *ref, *next_ref;
1752 struct v4l2_ctrl *ctrl, *next_ctrl;
1753 struct v4l2_subscribed_event *sev, *next_sev;
1754
1755 if (hdl == NULL || hdl->buckets == NULL)
1756 return;
1757
1758 mutex_lock(hdl->lock);
1759 /* Free all nodes */
1760 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1761 list_del(&ref->node);
1762 kfree(ref);
1763 }
1764 /* Free all controls owned by the handler */
1765 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1766 list_del(&ctrl->node);
1767 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1768 list_del(&sev->node);
1769 kfree(ctrl);
1770 }
1771 kfree(hdl->buckets);
1772 hdl->buckets = NULL;
1773 hdl->cached = NULL;
1774 hdl->error = 0;
1775 mutex_unlock(hdl->lock);
1776 }
1777 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1778
1779 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1780 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1781 with applications that do not use the NEXT_CTRL flag.
1782
1783 We just find the n-th private user control. It's O(N), but that should not
1784 be an issue in this particular case. */
1785 static struct v4l2_ctrl_ref *find_private_ref(
1786 struct v4l2_ctrl_handler *hdl, u32 id)
1787 {
1788 struct v4l2_ctrl_ref *ref;
1789
1790 id -= V4L2_CID_PRIVATE_BASE;
1791 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1792 /* Search for private user controls that are compatible with
1793 VIDIOC_G/S_CTRL. */
1794 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1795 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1796 if (!ref->ctrl->is_int)
1797 continue;
1798 if (id == 0)
1799 return ref;
1800 id--;
1801 }
1802 }
1803 return NULL;
1804 }
1805
1806 /* Find a control with the given ID. */
1807 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1808 {
1809 struct v4l2_ctrl_ref *ref;
1810 int bucket;
1811
1812 id &= V4L2_CTRL_ID_MASK;
1813
1814 /* Old-style private controls need special handling */
1815 if (id >= V4L2_CID_PRIVATE_BASE)
1816 return find_private_ref(hdl, id);
1817 bucket = id % hdl->nr_of_buckets;
1818
1819 /* Simple optimization: cache the last control found */
1820 if (hdl->cached && hdl->cached->ctrl->id == id)
1821 return hdl->cached;
1822
1823 /* Not in cache, search the hash */
1824 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1825 while (ref && ref->ctrl->id != id)
1826 ref = ref->next;
1827
1828 if (ref)
1829 hdl->cached = ref; /* cache it! */
1830 return ref;
1831 }
1832
1833 /* Find a control with the given ID. Take the handler's lock first. */
1834 static struct v4l2_ctrl_ref *find_ref_lock(
1835 struct v4l2_ctrl_handler *hdl, u32 id)
1836 {
1837 struct v4l2_ctrl_ref *ref = NULL;
1838
1839 if (hdl) {
1840 mutex_lock(hdl->lock);
1841 ref = find_ref(hdl, id);
1842 mutex_unlock(hdl->lock);
1843 }
1844 return ref;
1845 }
1846
1847 /* Find a control with the given ID. */
1848 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1849 {
1850 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1851
1852 return ref ? ref->ctrl : NULL;
1853 }
1854 EXPORT_SYMBOL(v4l2_ctrl_find);
1855
1856 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1857 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1858 struct v4l2_ctrl *ctrl)
1859 {
1860 struct v4l2_ctrl_ref *ref;
1861 struct v4l2_ctrl_ref *new_ref;
1862 u32 id = ctrl->id;
1863 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
1864 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1865
1866 /*
1867 * Automatically add the control class if it is not yet present and
1868 * the new control is not a compound control.
1869 */
1870 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1871 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1872 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1873 return hdl->error;
1874
1875 if (hdl->error)
1876 return hdl->error;
1877
1878 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1879 if (!new_ref)
1880 return handler_set_err(hdl, -ENOMEM);
1881 new_ref->ctrl = ctrl;
1882 if (ctrl->handler == hdl) {
1883 /* By default each control starts in a cluster of its own.
1884 new_ref->ctrl is basically a cluster array with one
1885 element, so that's perfect to use as the cluster pointer.
1886 But only do this for the handler that owns the control. */
1887 ctrl->cluster = &new_ref->ctrl;
1888 ctrl->ncontrols = 1;
1889 }
1890
1891 INIT_LIST_HEAD(&new_ref->node);
1892
1893 mutex_lock(hdl->lock);
1894
1895 /* Add immediately at the end of the list if the list is empty, or if
1896 the last element in the list has a lower ID.
1897 This ensures that when elements are added in ascending order the
1898 insertion is an O(1) operation. */
1899 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1900 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1901 goto insert_in_hash;
1902 }
1903
1904 /* Find insert position in sorted list */
1905 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1906 if (ref->ctrl->id < id)
1907 continue;
1908 /* Don't add duplicates */
1909 if (ref->ctrl->id == id) {
1910 kfree(new_ref);
1911 goto unlock;
1912 }
1913 list_add(&new_ref->node, ref->node.prev);
1914 break;
1915 }
1916
1917 insert_in_hash:
1918 /* Insert the control node in the hash */
1919 new_ref->next = hdl->buckets[bucket];
1920 hdl->buckets[bucket] = new_ref;
1921
1922 unlock:
1923 mutex_unlock(hdl->lock);
1924 return 0;
1925 }
1926
1927 /* Add a new control */
1928 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1929 const struct v4l2_ctrl_ops *ops,
1930 const struct v4l2_ctrl_type_ops *type_ops,
1931 u32 id, const char *name, enum v4l2_ctrl_type type,
1932 s64 min, s64 max, u64 step, s64 def,
1933 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1934 u32 flags, const char * const *qmenu,
1935 const s64 *qmenu_int, void *priv)
1936 {
1937 struct v4l2_ctrl *ctrl;
1938 unsigned sz_extra;
1939 unsigned nr_of_dims = 0;
1940 unsigned elems = 1;
1941 bool is_array;
1942 unsigned tot_ctrl_size;
1943 unsigned idx;
1944 void *data;
1945 int err;
1946
1947 if (hdl->error)
1948 return NULL;
1949
1950 while (dims && dims[nr_of_dims]) {
1951 elems *= dims[nr_of_dims];
1952 nr_of_dims++;
1953 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1954 break;
1955 }
1956 is_array = nr_of_dims > 0;
1957
1958 /* Prefill elem_size for all types handled by std_type_ops */
1959 switch (type) {
1960 case V4L2_CTRL_TYPE_INTEGER64:
1961 elem_size = sizeof(s64);
1962 break;
1963 case V4L2_CTRL_TYPE_STRING:
1964 elem_size = max + 1;
1965 break;
1966 case V4L2_CTRL_TYPE_U8:
1967 elem_size = sizeof(u8);
1968 break;
1969 case V4L2_CTRL_TYPE_U16:
1970 elem_size = sizeof(u16);
1971 break;
1972 case V4L2_CTRL_TYPE_U32:
1973 elem_size = sizeof(u32);
1974 break;
1975 default:
1976 if (type < V4L2_CTRL_COMPOUND_TYPES)
1977 elem_size = sizeof(s32);
1978 break;
1979 }
1980 tot_ctrl_size = elem_size * elems;
1981
1982 /* Sanity checks */
1983 if (id == 0 || name == NULL || !elem_size ||
1984 id >= V4L2_CID_PRIVATE_BASE ||
1985 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1986 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1987 handler_set_err(hdl, -ERANGE);
1988 return NULL;
1989 }
1990 err = check_range(type, min, max, step, def);
1991 if (err) {
1992 handler_set_err(hdl, err);
1993 return NULL;
1994 }
1995 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1996 handler_set_err(hdl, -ERANGE);
1997 return NULL;
1998 }
1999 if (is_array &&
2000 (type == V4L2_CTRL_TYPE_BUTTON ||
2001 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2002 handler_set_err(hdl, -EINVAL);
2003 return NULL;
2004 }
2005
2006 sz_extra = 0;
2007 if (type == V4L2_CTRL_TYPE_BUTTON)
2008 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2009 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2010 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2011 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2012 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2013 type == V4L2_CTRL_TYPE_STRING ||
2014 type >= V4L2_CTRL_COMPOUND_TYPES ||
2015 is_array)
2016 sz_extra += 2 * tot_ctrl_size;
2017
2018 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2019 if (ctrl == NULL) {
2020 handler_set_err(hdl, -ENOMEM);
2021 return NULL;
2022 }
2023
2024 INIT_LIST_HEAD(&ctrl->node);
2025 INIT_LIST_HEAD(&ctrl->ev_subs);
2026 ctrl->handler = hdl;
2027 ctrl->ops = ops;
2028 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2029 ctrl->id = id;
2030 ctrl->name = name;
2031 ctrl->type = type;
2032 ctrl->flags = flags;
2033 ctrl->minimum = min;
2034 ctrl->maximum = max;
2035 ctrl->step = step;
2036 ctrl->default_value = def;
2037 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2038 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2039 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2040 ctrl->is_array = is_array;
2041 ctrl->elems = elems;
2042 ctrl->nr_of_dims = nr_of_dims;
2043 if (nr_of_dims)
2044 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2045 ctrl->elem_size = elem_size;
2046 if (type == V4L2_CTRL_TYPE_MENU)
2047 ctrl->qmenu = qmenu;
2048 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2049 ctrl->qmenu_int = qmenu_int;
2050 ctrl->priv = priv;
2051 ctrl->cur.val = ctrl->val = def;
2052 data = &ctrl[1];
2053
2054 if (!ctrl->is_int) {
2055 ctrl->p_new.p = data;
2056 ctrl->p_cur.p = data + tot_ctrl_size;
2057 } else {
2058 ctrl->p_new.p = &ctrl->val;
2059 ctrl->p_cur.p = &ctrl->cur.val;
2060 }
2061 for (idx = 0; idx < elems; idx++) {
2062 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2063 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2064 }
2065
2066 if (handler_new_ref(hdl, ctrl)) {
2067 kfree(ctrl);
2068 return NULL;
2069 }
2070 mutex_lock(hdl->lock);
2071 list_add_tail(&ctrl->node, &hdl->ctrls);
2072 mutex_unlock(hdl->lock);
2073 return ctrl;
2074 }
2075
2076 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2077 const struct v4l2_ctrl_config *cfg, void *priv)
2078 {
2079 bool is_menu;
2080 struct v4l2_ctrl *ctrl;
2081 const char *name = cfg->name;
2082 const char * const *qmenu = cfg->qmenu;
2083 const s64 *qmenu_int = cfg->qmenu_int;
2084 enum v4l2_ctrl_type type = cfg->type;
2085 u32 flags = cfg->flags;
2086 s64 min = cfg->min;
2087 s64 max = cfg->max;
2088 u64 step = cfg->step;
2089 s64 def = cfg->def;
2090
2091 if (name == NULL)
2092 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2093 &def, &flags);
2094
2095 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2096 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2097 if (is_menu)
2098 WARN_ON(step);
2099 else
2100 WARN_ON(cfg->menu_skip_mask);
2101 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2102 qmenu = v4l2_ctrl_get_menu(cfg->id);
2103 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2104 qmenu_int == NULL) {
2105 handler_set_err(hdl, -EINVAL);
2106 return NULL;
2107 }
2108
2109 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2110 type, min, max,
2111 is_menu ? cfg->menu_skip_mask : step, def,
2112 cfg->dims, cfg->elem_size,
2113 flags, qmenu, qmenu_int, priv);
2114 if (ctrl)
2115 ctrl->is_private = cfg->is_private;
2116 return ctrl;
2117 }
2118 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2119
2120 /* Helper function for standard non-menu controls */
2121 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2122 const struct v4l2_ctrl_ops *ops,
2123 u32 id, s64 min, s64 max, u64 step, s64 def)
2124 {
2125 const char *name;
2126 enum v4l2_ctrl_type type;
2127 u32 flags;
2128
2129 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2130 if (type == V4L2_CTRL_TYPE_MENU ||
2131 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2132 type >= V4L2_CTRL_COMPOUND_TYPES) {
2133 handler_set_err(hdl, -EINVAL);
2134 return NULL;
2135 }
2136 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2137 min, max, step, def, NULL, 0,
2138 flags, NULL, NULL, NULL);
2139 }
2140 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2141
2142 /* Helper function for standard menu controls */
2143 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2144 const struct v4l2_ctrl_ops *ops,
2145 u32 id, u8 _max, u64 mask, u8 _def)
2146 {
2147 const char * const *qmenu = NULL;
2148 const s64 *qmenu_int = NULL;
2149 unsigned int qmenu_int_len = 0;
2150 const char *name;
2151 enum v4l2_ctrl_type type;
2152 s64 min;
2153 s64 max = _max;
2154 s64 def = _def;
2155 u64 step;
2156 u32 flags;
2157
2158 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2159
2160 if (type == V4L2_CTRL_TYPE_MENU)
2161 qmenu = v4l2_ctrl_get_menu(id);
2162 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2163 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2164
2165 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2166 handler_set_err(hdl, -EINVAL);
2167 return NULL;
2168 }
2169 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2170 0, max, mask, def, NULL, 0,
2171 flags, qmenu, qmenu_int, NULL);
2172 }
2173 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2174
2175 /* Helper function for standard menu controls with driver defined menu */
2176 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2177 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2178 u64 mask, u8 _def, const char * const *qmenu)
2179 {
2180 enum v4l2_ctrl_type type;
2181 const char *name;
2182 u32 flags;
2183 u64 step;
2184 s64 min;
2185 s64 max = _max;
2186 s64 def = _def;
2187
2188 /* v4l2_ctrl_new_std_menu_items() should only be called for
2189 * standard controls without a standard menu.
2190 */
2191 if (v4l2_ctrl_get_menu(id)) {
2192 handler_set_err(hdl, -EINVAL);
2193 return NULL;
2194 }
2195
2196 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2197 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2198 handler_set_err(hdl, -EINVAL);
2199 return NULL;
2200 }
2201 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2202 0, max, mask, def, NULL, 0,
2203 flags, qmenu, NULL, NULL);
2204
2205 }
2206 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2207
2208 /* Helper function for standard integer menu controls */
2209 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2210 const struct v4l2_ctrl_ops *ops,
2211 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2212 {
2213 const char *name;
2214 enum v4l2_ctrl_type type;
2215 s64 min;
2216 u64 step;
2217 s64 max = _max;
2218 s64 def = _def;
2219 u32 flags;
2220
2221 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2222 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2223 handler_set_err(hdl, -EINVAL);
2224 return NULL;
2225 }
2226 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2227 0, max, 0, def, NULL, 0,
2228 flags, NULL, qmenu_int, NULL);
2229 }
2230 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2231
2232 /* Add the controls from another handler to our own. */
2233 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2234 struct v4l2_ctrl_handler *add,
2235 bool (*filter)(const struct v4l2_ctrl *ctrl))
2236 {
2237 struct v4l2_ctrl_ref *ref;
2238 int ret = 0;
2239
2240 /* Do nothing if either handler is NULL or if they are the same */
2241 if (!hdl || !add || hdl == add)
2242 return 0;
2243 if (hdl->error)
2244 return hdl->error;
2245 mutex_lock(add->lock);
2246 list_for_each_entry(ref, &add->ctrl_refs, node) {
2247 struct v4l2_ctrl *ctrl = ref->ctrl;
2248
2249 /* Skip handler-private controls. */
2250 if (ctrl->is_private)
2251 continue;
2252 /* And control classes */
2253 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2254 continue;
2255 /* Filter any unwanted controls */
2256 if (filter && !filter(ctrl))
2257 continue;
2258 ret = handler_new_ref(hdl, ctrl);
2259 if (ret)
2260 break;
2261 }
2262 mutex_unlock(add->lock);
2263 return ret;
2264 }
2265 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2266
2267 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2268 {
2269 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2270 return true;
2271 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2272 return true;
2273 switch (ctrl->id) {
2274 case V4L2_CID_AUDIO_MUTE:
2275 case V4L2_CID_AUDIO_VOLUME:
2276 case V4L2_CID_AUDIO_BALANCE:
2277 case V4L2_CID_AUDIO_BASS:
2278 case V4L2_CID_AUDIO_TREBLE:
2279 case V4L2_CID_AUDIO_LOUDNESS:
2280 return true;
2281 default:
2282 break;
2283 }
2284 return false;
2285 }
2286 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2287
2288 /* Cluster controls */
2289 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2290 {
2291 bool has_volatiles = false;
2292 int i;
2293
2294 /* The first control is the master control and it must not be NULL */
2295 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2296 return;
2297
2298 for (i = 0; i < ncontrols; i++) {
2299 if (controls[i]) {
2300 controls[i]->cluster = controls;
2301 controls[i]->ncontrols = ncontrols;
2302 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2303 has_volatiles = true;
2304 }
2305 }
2306 controls[0]->has_volatiles = has_volatiles;
2307 }
2308 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2309
2310 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2311 u8 manual_val, bool set_volatile)
2312 {
2313 struct v4l2_ctrl *master = controls[0];
2314 u32 flag = 0;
2315 int i;
2316
2317 v4l2_ctrl_cluster(ncontrols, controls);
2318 WARN_ON(ncontrols <= 1);
2319 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2320 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2321 master->is_auto = true;
2322 master->has_volatiles = set_volatile;
2323 master->manual_mode_value = manual_val;
2324 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2325
2326 if (!is_cur_manual(master))
2327 flag = V4L2_CTRL_FLAG_INACTIVE |
2328 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2329
2330 for (i = 1; i < ncontrols; i++)
2331 if (controls[i])
2332 controls[i]->flags |= flag;
2333 }
2334 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2335
2336 /* Activate/deactivate a control. */
2337 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2338 {
2339 /* invert since the actual flag is called 'inactive' */
2340 bool inactive = !active;
2341 bool old;
2342
2343 if (ctrl == NULL)
2344 return;
2345
2346 if (inactive)
2347 /* set V4L2_CTRL_FLAG_INACTIVE */
2348 old = test_and_set_bit(4, &ctrl->flags);
2349 else
2350 /* clear V4L2_CTRL_FLAG_INACTIVE */
2351 old = test_and_clear_bit(4, &ctrl->flags);
2352 if (old != inactive)
2353 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2354 }
2355 EXPORT_SYMBOL(v4l2_ctrl_activate);
2356
2357 /* Grab/ungrab a control.
2358 Typically used when streaming starts and you want to grab controls,
2359 preventing the user from changing them.
2360
2361 Just call this and the framework will block any attempts to change
2362 these controls. */
2363 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2364 {
2365 bool old;
2366
2367 if (ctrl == NULL)
2368 return;
2369
2370 v4l2_ctrl_lock(ctrl);
2371 if (grabbed)
2372 /* set V4L2_CTRL_FLAG_GRABBED */
2373 old = test_and_set_bit(1, &ctrl->flags);
2374 else
2375 /* clear V4L2_CTRL_FLAG_GRABBED */
2376 old = test_and_clear_bit(1, &ctrl->flags);
2377 if (old != grabbed)
2378 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2379 v4l2_ctrl_unlock(ctrl);
2380 }
2381 EXPORT_SYMBOL(v4l2_ctrl_grab);
2382
2383 /* Log the control name and value */
2384 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2385 const char *prefix, const char *colon)
2386 {
2387 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2388 return;
2389 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2390 return;
2391
2392 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2393
2394 ctrl->type_ops->log(ctrl);
2395
2396 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2397 V4L2_CTRL_FLAG_GRABBED |
2398 V4L2_CTRL_FLAG_VOLATILE)) {
2399 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2400 pr_cont(" inactive");
2401 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2402 pr_cont(" grabbed");
2403 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2404 pr_cont(" volatile");
2405 }
2406 pr_cont("\n");
2407 }
2408
2409 /* Log all controls owned by the handler */
2410 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2411 const char *prefix)
2412 {
2413 struct v4l2_ctrl *ctrl;
2414 const char *colon = "";
2415 int len;
2416
2417 if (hdl == NULL)
2418 return;
2419 if (prefix == NULL)
2420 prefix = "";
2421 len = strlen(prefix);
2422 if (len && prefix[len - 1] != ' ')
2423 colon = ": ";
2424 mutex_lock(hdl->lock);
2425 list_for_each_entry(ctrl, &hdl->ctrls, node)
2426 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2427 log_ctrl(ctrl, prefix, colon);
2428 mutex_unlock(hdl->lock);
2429 }
2430 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2431
2432 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2433 {
2434 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2435 return 0;
2436 }
2437 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2438
2439 /* Call s_ctrl for all controls owned by the handler */
2440 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2441 {
2442 struct v4l2_ctrl *ctrl;
2443 int ret = 0;
2444
2445 if (hdl == NULL)
2446 return 0;
2447 mutex_lock(hdl->lock);
2448 list_for_each_entry(ctrl, &hdl->ctrls, node)
2449 ctrl->done = false;
2450
2451 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2452 struct v4l2_ctrl *master = ctrl->cluster[0];
2453 int i;
2454
2455 /* Skip if this control was already handled by a cluster. */
2456 /* Skip button controls and read-only controls. */
2457 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2458 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2459 continue;
2460
2461 for (i = 0; i < master->ncontrols; i++) {
2462 if (master->cluster[i]) {
2463 cur_to_new(master->cluster[i]);
2464 master->cluster[i]->is_new = 1;
2465 master->cluster[i]->done = true;
2466 }
2467 }
2468 ret = call_op(master, s_ctrl);
2469 if (ret)
2470 break;
2471 }
2472 mutex_unlock(hdl->lock);
2473 return ret;
2474 }
2475 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2476
2477 /* Implement VIDIOC_QUERY_EXT_CTRL */
2478 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2479 {
2480 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2481 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2482 struct v4l2_ctrl_ref *ref;
2483 struct v4l2_ctrl *ctrl;
2484
2485 if (hdl == NULL)
2486 return -EINVAL;
2487
2488 mutex_lock(hdl->lock);
2489
2490 /* Try to find it */
2491 ref = find_ref(hdl, id);
2492
2493 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2494 bool is_compound;
2495 /* Match any control that is not hidden */
2496 unsigned mask = 1;
2497 bool match = false;
2498
2499 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2500 /* Match any hidden control */
2501 match = true;
2502 } else if ((qc->id & next_flags) == next_flags) {
2503 /* Match any control, compound or not */
2504 mask = 0;
2505 }
2506
2507 /* Find the next control with ID > qc->id */
2508
2509 /* Did we reach the end of the control list? */
2510 if (id >= node2id(hdl->ctrl_refs.prev)) {
2511 ref = NULL; /* Yes, so there is no next control */
2512 } else if (ref) {
2513 /* We found a control with the given ID, so just get
2514 the next valid one in the list. */
2515 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2516 is_compound = ref->ctrl->is_array ||
2517 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2518 if (id < ref->ctrl->id &&
2519 (is_compound & mask) == match)
2520 break;
2521 }
2522 if (&ref->node == &hdl->ctrl_refs)
2523 ref = NULL;
2524 } else {
2525 /* No control with the given ID exists, so start
2526 searching for the next largest ID. We know there
2527 is one, otherwise the first 'if' above would have
2528 been true. */
2529 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2530 is_compound = ref->ctrl->is_array ||
2531 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2532 if (id < ref->ctrl->id &&
2533 (is_compound & mask) == match)
2534 break;
2535 }
2536 if (&ref->node == &hdl->ctrl_refs)
2537 ref = NULL;
2538 }
2539 }
2540 mutex_unlock(hdl->lock);
2541
2542 if (!ref)
2543 return -EINVAL;
2544
2545 ctrl = ref->ctrl;
2546 memset(qc, 0, sizeof(*qc));
2547 if (id >= V4L2_CID_PRIVATE_BASE)
2548 qc->id = id;
2549 else
2550 qc->id = ctrl->id;
2551 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2552 qc->flags = ctrl->flags;
2553 qc->type = ctrl->type;
2554 if (ctrl->is_ptr)
2555 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2556 qc->elem_size = ctrl->elem_size;
2557 qc->elems = ctrl->elems;
2558 qc->nr_of_dims = ctrl->nr_of_dims;
2559 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2560 qc->minimum = ctrl->minimum;
2561 qc->maximum = ctrl->maximum;
2562 qc->default_value = ctrl->default_value;
2563 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2564 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2565 qc->step = 1;
2566 else
2567 qc->step = ctrl->step;
2568 return 0;
2569 }
2570 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2571
2572 /* Implement VIDIOC_QUERYCTRL */
2573 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2574 {
2575 struct v4l2_query_ext_ctrl qec = { qc->id };
2576 int rc;
2577
2578 rc = v4l2_query_ext_ctrl(hdl, &qec);
2579 if (rc)
2580 return rc;
2581
2582 qc->id = qec.id;
2583 qc->type = qec.type;
2584 qc->flags = qec.flags;
2585 strlcpy(qc->name, qec.name, sizeof(qc->name));
2586 switch (qc->type) {
2587 case V4L2_CTRL_TYPE_INTEGER:
2588 case V4L2_CTRL_TYPE_BOOLEAN:
2589 case V4L2_CTRL_TYPE_MENU:
2590 case V4L2_CTRL_TYPE_INTEGER_MENU:
2591 case V4L2_CTRL_TYPE_STRING:
2592 case V4L2_CTRL_TYPE_BITMASK:
2593 qc->minimum = qec.minimum;
2594 qc->maximum = qec.maximum;
2595 qc->step = qec.step;
2596 qc->default_value = qec.default_value;
2597 break;
2598 default:
2599 qc->minimum = 0;
2600 qc->maximum = 0;
2601 qc->step = 0;
2602 qc->default_value = 0;
2603 break;
2604 }
2605 return 0;
2606 }
2607 EXPORT_SYMBOL(v4l2_queryctrl);
2608
2609 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2610 {
2611 if (qc->id & (V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND))
2612 return -EINVAL;
2613 return v4l2_queryctrl(sd->ctrl_handler, qc);
2614 }
2615 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2616
2617 /* Implement VIDIOC_QUERYMENU */
2618 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2619 {
2620 struct v4l2_ctrl *ctrl;
2621 u32 i = qm->index;
2622
2623 ctrl = v4l2_ctrl_find(hdl, qm->id);
2624 if (!ctrl)
2625 return -EINVAL;
2626
2627 qm->reserved = 0;
2628 /* Sanity checks */
2629 switch (ctrl->type) {
2630 case V4L2_CTRL_TYPE_MENU:
2631 if (ctrl->qmenu == NULL)
2632 return -EINVAL;
2633 break;
2634 case V4L2_CTRL_TYPE_INTEGER_MENU:
2635 if (ctrl->qmenu_int == NULL)
2636 return -EINVAL;
2637 break;
2638 default:
2639 return -EINVAL;
2640 }
2641
2642 if (i < ctrl->minimum || i > ctrl->maximum)
2643 return -EINVAL;
2644
2645 /* Use mask to see if this menu item should be skipped */
2646 if (ctrl->menu_skip_mask & (1 << i))
2647 return -EINVAL;
2648 /* Empty menu items should also be skipped */
2649 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2650 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2651 return -EINVAL;
2652 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2653 } else {
2654 qm->value = ctrl->qmenu_int[i];
2655 }
2656 return 0;
2657 }
2658 EXPORT_SYMBOL(v4l2_querymenu);
2659
2660 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2661 {
2662 return v4l2_querymenu(sd->ctrl_handler, qm);
2663 }
2664 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2665
2666
2667
2668 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2669
2670 It is not a fully atomic operation, just best-effort only. After all, if
2671 multiple controls have to be set through multiple i2c writes (for example)
2672 then some initial writes may succeed while others fail. Thus leaving the
2673 system in an inconsistent state. The question is how much effort you are
2674 willing to spend on trying to make something atomic that really isn't.
2675
2676 From the point of view of an application the main requirement is that
2677 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2678 error should be returned without actually affecting any controls.
2679
2680 If all the values are correct, then it is acceptable to just give up
2681 in case of low-level errors.
2682
2683 It is important though that the application can tell when only a partial
2684 configuration was done. The way we do that is through the error_idx field
2685 of struct v4l2_ext_controls: if that is equal to the count field then no
2686 controls were affected. Otherwise all controls before that index were
2687 successful in performing their 'get' or 'set' operation, the control at
2688 the given index failed, and you don't know what happened with the controls
2689 after the failed one. Since if they were part of a control cluster they
2690 could have been successfully processed (if a cluster member was encountered
2691 at index < error_idx), they could have failed (if a cluster member was at
2692 error_idx), or they may not have been processed yet (if the first cluster
2693 member appeared after error_idx).
2694
2695 It is all fairly theoretical, though. In practice all you can do is to
2696 bail out. If error_idx == count, then it is an application bug. If
2697 error_idx < count then it is only an application bug if the error code was
2698 EBUSY. That usually means that something started streaming just when you
2699 tried to set the controls. In all other cases it is a driver/hardware
2700 problem and all you can do is to retry or bail out.
2701
2702 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2703 never modifies controls the error_idx is just set to whatever control
2704 has an invalid value.
2705 */
2706
2707 /* Prepare for the extended g/s/try functions.
2708 Find the controls in the control array and do some basic checks. */
2709 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2710 struct v4l2_ext_controls *cs,
2711 struct v4l2_ctrl_helper *helpers,
2712 bool get)
2713 {
2714 struct v4l2_ctrl_helper *h;
2715 bool have_clusters = false;
2716 u32 i;
2717
2718 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2719 struct v4l2_ext_control *c = &cs->controls[i];
2720 struct v4l2_ctrl_ref *ref;
2721 struct v4l2_ctrl *ctrl;
2722 u32 id = c->id & V4L2_CTRL_ID_MASK;
2723
2724 cs->error_idx = i;
2725
2726 if (cs->which &&
2727 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2728 V4L2_CTRL_ID2WHICH(id) != cs->which)
2729 return -EINVAL;
2730
2731 /* Old-style private controls are not allowed for
2732 extended controls */
2733 if (id >= V4L2_CID_PRIVATE_BASE)
2734 return -EINVAL;
2735 ref = find_ref_lock(hdl, id);
2736 if (ref == NULL)
2737 return -EINVAL;
2738 ctrl = ref->ctrl;
2739 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2740 return -EINVAL;
2741
2742 if (ctrl->cluster[0]->ncontrols > 1)
2743 have_clusters = true;
2744 if (ctrl->cluster[0] != ctrl)
2745 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2746 if (ctrl->is_ptr && !ctrl->is_string) {
2747 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2748
2749 if (c->size < tot_size) {
2750 if (get) {
2751 c->size = tot_size;
2752 return -ENOSPC;
2753 }
2754 return -EFAULT;
2755 }
2756 c->size = tot_size;
2757 }
2758 /* Store the ref to the master control of the cluster */
2759 h->mref = ref;
2760 h->ctrl = ctrl;
2761 /* Initially set next to 0, meaning that there is no other
2762 control in this helper array belonging to the same
2763 cluster */
2764 h->next = 0;
2765 }
2766
2767 /* We are done if there were no controls that belong to a multi-
2768 control cluster. */
2769 if (!have_clusters)
2770 return 0;
2771
2772 /* The code below figures out in O(n) time which controls in the list
2773 belong to the same cluster. */
2774
2775 /* This has to be done with the handler lock taken. */
2776 mutex_lock(hdl->lock);
2777
2778 /* First zero the helper field in the master control references */
2779 for (i = 0; i < cs->count; i++)
2780 helpers[i].mref->helper = NULL;
2781 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2782 struct v4l2_ctrl_ref *mref = h->mref;
2783
2784 /* If the mref->helper is set, then it points to an earlier
2785 helper that belongs to the same cluster. */
2786 if (mref->helper) {
2787 /* Set the next field of mref->helper to the current
2788 index: this means that that earlier helper now
2789 points to the next helper in the same cluster. */
2790 mref->helper->next = i;
2791 /* mref should be set only for the first helper in the
2792 cluster, clear the others. */
2793 h->mref = NULL;
2794 }
2795 /* Point the mref helper to the current helper struct. */
2796 mref->helper = h;
2797 }
2798 mutex_unlock(hdl->lock);
2799 return 0;
2800 }
2801
2802 /* Handles the corner case where cs->count == 0. It checks whether the
2803 specified control class exists. If that class ID is 0, then it checks
2804 whether there are any controls at all. */
2805 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2806 {
2807 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2808 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2809 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2810 }
2811
2812
2813
2814 /* Get extended controls. Allocates the helpers array if needed. */
2815 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2816 {
2817 struct v4l2_ctrl_helper helper[4];
2818 struct v4l2_ctrl_helper *helpers = helper;
2819 int ret;
2820 int i, j;
2821 bool def_value;
2822
2823 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2824
2825 cs->error_idx = cs->count;
2826 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2827
2828 if (hdl == NULL)
2829 return -EINVAL;
2830
2831 if (cs->count == 0)
2832 return class_check(hdl, cs->which);
2833
2834 if (cs->count > ARRAY_SIZE(helper)) {
2835 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2836 GFP_KERNEL);
2837 if (helpers == NULL)
2838 return -ENOMEM;
2839 }
2840
2841 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2842 cs->error_idx = cs->count;
2843
2844 for (i = 0; !ret && i < cs->count; i++)
2845 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2846 ret = -EACCES;
2847
2848 for (i = 0; !ret && i < cs->count; i++) {
2849 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2850 struct v4l2_ctrl *ctrl);
2851 struct v4l2_ctrl *master;
2852
2853 ctrl_to_user = def_value ? def_to_user : cur_to_user;
2854
2855 if (helpers[i].mref == NULL)
2856 continue;
2857
2858 master = helpers[i].mref->ctrl;
2859 cs->error_idx = i;
2860
2861 v4l2_ctrl_lock(master);
2862
2863 /* g_volatile_ctrl will update the new control values */
2864 if (!def_value &&
2865 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2866 (master->has_volatiles && !is_cur_manual(master)))) {
2867 for (j = 0; j < master->ncontrols; j++)
2868 cur_to_new(master->cluster[j]);
2869 ret = call_op(master, g_volatile_ctrl);
2870 ctrl_to_user = new_to_user;
2871 }
2872 /* If OK, then copy the current (for non-volatile controls)
2873 or the new (for volatile controls) control values to the
2874 caller */
2875 if (!ret) {
2876 u32 idx = i;
2877
2878 do {
2879 ret = ctrl_to_user(cs->controls + idx,
2880 helpers[idx].ctrl);
2881 idx = helpers[idx].next;
2882 } while (!ret && idx);
2883 }
2884 v4l2_ctrl_unlock(master);
2885 }
2886
2887 if (cs->count > ARRAY_SIZE(helper))
2888 kfree(helpers);
2889 return ret;
2890 }
2891 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2892
2893 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2894 {
2895 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2896 }
2897 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2898
2899 /* Helper function to get a single control */
2900 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2901 {
2902 struct v4l2_ctrl *master = ctrl->cluster[0];
2903 int ret = 0;
2904 int i;
2905
2906 /* Compound controls are not supported. The new_to_user() and
2907 * cur_to_user() calls below would need to be modified not to access
2908 * userspace memory when called from get_ctrl().
2909 */
2910 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2911 return -EINVAL;
2912
2913 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2914 return -EACCES;
2915
2916 v4l2_ctrl_lock(master);
2917 /* g_volatile_ctrl will update the current control values */
2918 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2919 for (i = 0; i < master->ncontrols; i++)
2920 cur_to_new(master->cluster[i]);
2921 ret = call_op(master, g_volatile_ctrl);
2922 new_to_user(c, ctrl);
2923 } else {
2924 cur_to_user(c, ctrl);
2925 }
2926 v4l2_ctrl_unlock(master);
2927 return ret;
2928 }
2929
2930 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2931 {
2932 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2933 struct v4l2_ext_control c;
2934 int ret;
2935
2936 if (ctrl == NULL || !ctrl->is_int)
2937 return -EINVAL;
2938 ret = get_ctrl(ctrl, &c);
2939 control->value = c.value;
2940 return ret;
2941 }
2942 EXPORT_SYMBOL(v4l2_g_ctrl);
2943
2944 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2945 {
2946 return v4l2_g_ctrl(sd->ctrl_handler, control);
2947 }
2948 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2949
2950 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2951 {
2952 struct v4l2_ext_control c;
2953
2954 /* It's a driver bug if this happens. */
2955 WARN_ON(!ctrl->is_int);
2956 c.value = 0;
2957 get_ctrl(ctrl, &c);
2958 return c.value;
2959 }
2960 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2961
2962 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2963 {
2964 struct v4l2_ext_control c;
2965
2966 /* It's a driver bug if this happens. */
2967 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2968 c.value64 = 0;
2969 get_ctrl(ctrl, &c);
2970 return c.value64;
2971 }
2972 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2973
2974
2975 /* Core function that calls try/s_ctrl and ensures that the new value is
2976 copied to the current value on a set.
2977 Must be called with ctrl->handler->lock held. */
2978 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2979 bool set, u32 ch_flags)
2980 {
2981 bool update_flag;
2982 int ret;
2983 int i;
2984
2985 /* Go through the cluster and either validate the new value or
2986 (if no new value was set), copy the current value to the new
2987 value, ensuring a consistent view for the control ops when
2988 called. */
2989 for (i = 0; i < master->ncontrols; i++) {
2990 struct v4l2_ctrl *ctrl = master->cluster[i];
2991
2992 if (ctrl == NULL)
2993 continue;
2994
2995 if (!ctrl->is_new) {
2996 cur_to_new(ctrl);
2997 continue;
2998 }
2999 /* Check again: it may have changed since the
3000 previous check in try_or_set_ext_ctrls(). */
3001 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3002 return -EBUSY;
3003 }
3004
3005 ret = call_op(master, try_ctrl);
3006
3007 /* Don't set if there is no change */
3008 if (ret || !set || !cluster_changed(master))
3009 return ret;
3010 ret = call_op(master, s_ctrl);
3011 if (ret)
3012 return ret;
3013
3014 /* If OK, then make the new values permanent. */
3015 update_flag = is_cur_manual(master) != is_new_manual(master);
3016 for (i = 0; i < master->ncontrols; i++)
3017 new_to_cur(fh, master->cluster[i], ch_flags |
3018 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3019 return 0;
3020 }
3021
3022 /* Validate controls. */
3023 static int validate_ctrls(struct v4l2_ext_controls *cs,
3024 struct v4l2_ctrl_helper *helpers, bool set)
3025 {
3026 unsigned i;
3027 int ret = 0;
3028
3029 cs->error_idx = cs->count;
3030 for (i = 0; i < cs->count; i++) {
3031 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3032 union v4l2_ctrl_ptr p_new;
3033
3034 cs->error_idx = i;
3035
3036 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3037 return -EACCES;
3038 /* This test is also done in try_set_control_cluster() which
3039 is called in atomic context, so that has the final say,
3040 but it makes sense to do an up-front check as well. Once
3041 an error occurs in try_set_control_cluster() some other
3042 controls may have been set already and we want to do a
3043 best-effort to avoid that. */
3044 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3045 return -EBUSY;
3046 /*
3047 * Skip validation for now if the payload needs to be copied
3048 * from userspace into kernelspace. We'll validate those later.
3049 */
3050 if (ctrl->is_ptr)
3051 continue;
3052 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3053 p_new.p_s64 = &cs->controls[i].value64;
3054 else
3055 p_new.p_s32 = &cs->controls[i].value;
3056 ret = validate_new(ctrl, p_new);
3057 if (ret)
3058 return ret;
3059 }
3060 return 0;
3061 }
3062
3063 /* Obtain the current volatile values of an autocluster and mark them
3064 as new. */
3065 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3066 {
3067 int i;
3068
3069 for (i = 1; i < master->ncontrols; i++)
3070 cur_to_new(master->cluster[i]);
3071 if (!call_op(master, g_volatile_ctrl))
3072 for (i = 1; i < master->ncontrols; i++)
3073 if (master->cluster[i])
3074 master->cluster[i]->is_new = 1;
3075 }
3076
3077 /* Try or try-and-set controls */
3078 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3079 struct v4l2_ext_controls *cs,
3080 bool set)
3081 {
3082 struct v4l2_ctrl_helper helper[4];
3083 struct v4l2_ctrl_helper *helpers = helper;
3084 unsigned i, j;
3085 int ret;
3086
3087 cs->error_idx = cs->count;
3088
3089 /* Default value cannot be changed */
3090 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3091 return -EINVAL;
3092
3093 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3094
3095 if (hdl == NULL)
3096 return -EINVAL;
3097
3098 if (cs->count == 0)
3099 return class_check(hdl, cs->which);
3100
3101 if (cs->count > ARRAY_SIZE(helper)) {
3102 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3103 GFP_KERNEL);
3104 if (!helpers)
3105 return -ENOMEM;
3106 }
3107 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3108 if (!ret)
3109 ret = validate_ctrls(cs, helpers, set);
3110 if (ret && set)
3111 cs->error_idx = cs->count;
3112 for (i = 0; !ret && i < cs->count; i++) {
3113 struct v4l2_ctrl *master;
3114 u32 idx = i;
3115
3116 if (helpers[i].mref == NULL)
3117 continue;
3118
3119 cs->error_idx = i;
3120 master = helpers[i].mref->ctrl;
3121 v4l2_ctrl_lock(master);
3122
3123 /* Reset the 'is_new' flags of the cluster */
3124 for (j = 0; j < master->ncontrols; j++)
3125 if (master->cluster[j])
3126 master->cluster[j]->is_new = 0;
3127
3128 /* For volatile autoclusters that are currently in auto mode
3129 we need to discover if it will be set to manual mode.
3130 If so, then we have to copy the current volatile values
3131 first since those will become the new manual values (which
3132 may be overwritten by explicit new values from this set
3133 of controls). */
3134 if (master->is_auto && master->has_volatiles &&
3135 !is_cur_manual(master)) {
3136 /* Pick an initial non-manual value */
3137 s32 new_auto_val = master->manual_mode_value + 1;
3138 u32 tmp_idx = idx;
3139
3140 do {
3141 /* Check if the auto control is part of the
3142 list, and remember the new value. */
3143 if (helpers[tmp_idx].ctrl == master)
3144 new_auto_val = cs->controls[tmp_idx].value;
3145 tmp_idx = helpers[tmp_idx].next;
3146 } while (tmp_idx);
3147 /* If the new value == the manual value, then copy
3148 the current volatile values. */
3149 if (new_auto_val == master->manual_mode_value)
3150 update_from_auto_cluster(master);
3151 }
3152
3153 /* Copy the new caller-supplied control values.
3154 user_to_new() sets 'is_new' to 1. */
3155 do {
3156 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3157
3158 ret = user_to_new(cs->controls + idx, ctrl);
3159 if (!ret && ctrl->is_ptr)
3160 ret = validate_new(ctrl, ctrl->p_new);
3161 idx = helpers[idx].next;
3162 } while (!ret && idx);
3163
3164 if (!ret)
3165 ret = try_or_set_cluster(fh, master, set, 0);
3166
3167 /* Copy the new values back to userspace. */
3168 if (!ret) {
3169 idx = i;
3170 do {
3171 ret = new_to_user(cs->controls + idx,
3172 helpers[idx].ctrl);
3173 idx = helpers[idx].next;
3174 } while (!ret && idx);
3175 }
3176 v4l2_ctrl_unlock(master);
3177 }
3178
3179 if (cs->count > ARRAY_SIZE(helper))
3180 kfree(helpers);
3181 return ret;
3182 }
3183
3184 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3185 {
3186 return try_set_ext_ctrls(NULL, hdl, cs, false);
3187 }
3188 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3189
3190 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3191 struct v4l2_ext_controls *cs)
3192 {
3193 return try_set_ext_ctrls(fh, hdl, cs, true);
3194 }
3195 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3196
3197 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3198 {
3199 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
3200 }
3201 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
3202
3203 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3204 {
3205 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
3206 }
3207 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
3208
3209 /* Helper function for VIDIOC_S_CTRL compatibility */
3210 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3211 {
3212 struct v4l2_ctrl *master = ctrl->cluster[0];
3213 int ret;
3214 int i;
3215
3216 /* Reset the 'is_new' flags of the cluster */
3217 for (i = 0; i < master->ncontrols; i++)
3218 if (master->cluster[i])
3219 master->cluster[i]->is_new = 0;
3220
3221 ret = validate_new(ctrl, ctrl->p_new);
3222 if (ret)
3223 return ret;
3224
3225 /* For autoclusters with volatiles that are switched from auto to
3226 manual mode we have to update the current volatile values since
3227 those will become the initial manual values after such a switch. */
3228 if (master->is_auto && master->has_volatiles && ctrl == master &&
3229 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3230 update_from_auto_cluster(master);
3231
3232 ctrl->is_new = 1;
3233 return try_or_set_cluster(fh, master, true, ch_flags);
3234 }
3235
3236 /* Helper function for VIDIOC_S_CTRL compatibility */
3237 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3238 struct v4l2_ext_control *c)
3239 {
3240 int ret;
3241
3242 v4l2_ctrl_lock(ctrl);
3243 user_to_new(c, ctrl);
3244 ret = set_ctrl(fh, ctrl, 0);
3245 if (!ret)
3246 cur_to_user(c, ctrl);
3247 v4l2_ctrl_unlock(ctrl);
3248 return ret;
3249 }
3250
3251 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3252 struct v4l2_control *control)
3253 {
3254 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3255 struct v4l2_ext_control c = { control->id };
3256 int ret;
3257
3258 if (ctrl == NULL || !ctrl->is_int)
3259 return -EINVAL;
3260
3261 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3262 return -EACCES;
3263
3264 c.value = control->value;
3265 ret = set_ctrl_lock(fh, ctrl, &c);
3266 control->value = c.value;
3267 return ret;
3268 }
3269 EXPORT_SYMBOL(v4l2_s_ctrl);
3270
3271 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
3272 {
3273 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
3274 }
3275 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
3276
3277 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3278 {
3279 lockdep_assert_held(ctrl->handler->lock);
3280
3281 /* It's a driver bug if this happens. */
3282 WARN_ON(!ctrl->is_int);
3283 ctrl->val = val;
3284 return set_ctrl(NULL, ctrl, 0);
3285 }
3286 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3287
3288 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3289 {
3290 lockdep_assert_held(ctrl->handler->lock);
3291
3292 /* It's a driver bug if this happens. */
3293 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3294 *ctrl->p_new.p_s64 = val;
3295 return set_ctrl(NULL, ctrl, 0);
3296 }
3297 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3298
3299 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3300 {
3301 lockdep_assert_held(ctrl->handler->lock);
3302
3303 /* It's a driver bug if this happens. */
3304 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3305 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3306 return set_ctrl(NULL, ctrl, 0);
3307 }
3308 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3309
3310 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3311 {
3312 if (ctrl == NULL)
3313 return;
3314 if (notify == NULL) {
3315 ctrl->call_notify = 0;
3316 return;
3317 }
3318 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3319 return;
3320 ctrl->handler->notify = notify;
3321 ctrl->handler->notify_priv = priv;
3322 ctrl->call_notify = 1;
3323 }
3324 EXPORT_SYMBOL(v4l2_ctrl_notify);
3325
3326 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3327 s64 min, s64 max, u64 step, s64 def)
3328 {
3329 bool value_changed;
3330 bool range_changed = false;
3331 int ret;
3332
3333 lockdep_assert_held(ctrl->handler->lock);
3334
3335 switch (ctrl->type) {
3336 case V4L2_CTRL_TYPE_INTEGER:
3337 case V4L2_CTRL_TYPE_INTEGER64:
3338 case V4L2_CTRL_TYPE_BOOLEAN:
3339 case V4L2_CTRL_TYPE_MENU:
3340 case V4L2_CTRL_TYPE_INTEGER_MENU:
3341 case V4L2_CTRL_TYPE_BITMASK:
3342 case V4L2_CTRL_TYPE_U8:
3343 case V4L2_CTRL_TYPE_U16:
3344 case V4L2_CTRL_TYPE_U32:
3345 if (ctrl->is_array)
3346 return -EINVAL;
3347 ret = check_range(ctrl->type, min, max, step, def);
3348 if (ret)
3349 return ret;
3350 break;
3351 default:
3352 return -EINVAL;
3353 }
3354 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3355 (ctrl->step != step) || ctrl->default_value != def) {
3356 range_changed = true;
3357 ctrl->minimum = min;
3358 ctrl->maximum = max;
3359 ctrl->step = step;
3360 ctrl->default_value = def;
3361 }
3362 cur_to_new(ctrl);
3363 if (validate_new(ctrl, ctrl->p_new)) {
3364 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3365 *ctrl->p_new.p_s64 = def;
3366 else
3367 *ctrl->p_new.p_s32 = def;
3368 }
3369
3370 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3371 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3372 else
3373 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3374 if (value_changed)
3375 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3376 else if (range_changed)
3377 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3378 return ret;
3379 }
3380 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3381
3382 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3383 {
3384 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3385
3386 if (ctrl == NULL)
3387 return -EINVAL;
3388
3389 v4l2_ctrl_lock(ctrl);
3390 list_add_tail(&sev->node, &ctrl->ev_subs);
3391 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3392 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3393 struct v4l2_event ev;
3394 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3395
3396 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3397 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3398 fill_event(&ev, ctrl, changes);
3399 /* Mark the queue as active, allowing this initial
3400 event to be accepted. */
3401 sev->elems = elems;
3402 v4l2_event_queue_fh(sev->fh, &ev);
3403 }
3404 v4l2_ctrl_unlock(ctrl);
3405 return 0;
3406 }
3407
3408 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3409 {
3410 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3411
3412 v4l2_ctrl_lock(ctrl);
3413 list_del(&sev->node);
3414 v4l2_ctrl_unlock(ctrl);
3415 }
3416
3417 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3418 {
3419 u32 old_changes = old->u.ctrl.changes;
3420
3421 old->u.ctrl = new->u.ctrl;
3422 old->u.ctrl.changes |= old_changes;
3423 }
3424 EXPORT_SYMBOL(v4l2_ctrl_replace);
3425
3426 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3427 {
3428 new->u.ctrl.changes |= old->u.ctrl.changes;
3429 }
3430 EXPORT_SYMBOL(v4l2_ctrl_merge);
3431
3432 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3433 .add = v4l2_ctrl_add_event,
3434 .del = v4l2_ctrl_del_event,
3435 .replace = v4l2_ctrl_replace,
3436 .merge = v4l2_ctrl_merge,
3437 };
3438 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3439
3440 int v4l2_ctrl_log_status(struct file *file, void *fh)
3441 {
3442 struct video_device *vfd = video_devdata(file);
3443 struct v4l2_fh *vfh = file->private_data;
3444
3445 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3446 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3447 vfd->v4l2_dev->name);
3448 return 0;
3449 }
3450 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3451
3452 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3453 const struct v4l2_event_subscription *sub)
3454 {
3455 if (sub->type == V4L2_EVENT_CTRL)
3456 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3457 return -EINVAL;
3458 }
3459 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3460
3461 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3462 struct v4l2_event_subscription *sub)
3463 {
3464 if (!sd->ctrl_handler)
3465 return -EINVAL;
3466 return v4l2_ctrl_subscribe_event(fh, sub);
3467 }
3468 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3469
3470 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3471 {
3472 struct v4l2_fh *fh = file->private_data;
3473
3474 if (v4l2_event_pending(fh))
3475 return POLLPRI;
3476 poll_wait(file, &fh->wait, wait);
3477 return 0;
3478 }
3479 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux kernel - Deliverables
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