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[media] v4l2-ctrls: add new RDS TX controls
[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 detect_md_mode[] = {
466 "Disabled",
467 "Global",
468 "Threshold Grid",
469 "Region Grid",
470 NULL,
471 };
472
473
474 switch (id) {
475 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
476 return mpeg_audio_sampling_freq;
477 case V4L2_CID_MPEG_AUDIO_ENCODING:
478 return mpeg_audio_encoding;
479 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
480 return mpeg_audio_l1_bitrate;
481 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
482 return mpeg_audio_l2_bitrate;
483 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
484 return mpeg_audio_l3_bitrate;
485 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
486 return mpeg_audio_ac3_bitrate;
487 case V4L2_CID_MPEG_AUDIO_MODE:
488 return mpeg_audio_mode;
489 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
490 return mpeg_audio_mode_extension;
491 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
492 return mpeg_audio_emphasis;
493 case V4L2_CID_MPEG_AUDIO_CRC:
494 return mpeg_audio_crc;
495 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
496 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
497 return mpeg_audio_dec_playback;
498 case V4L2_CID_MPEG_VIDEO_ENCODING:
499 return mpeg_video_encoding;
500 case V4L2_CID_MPEG_VIDEO_ASPECT:
501 return mpeg_video_aspect;
502 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
503 return mpeg_video_bitrate_mode;
504 case V4L2_CID_MPEG_STREAM_TYPE:
505 return mpeg_stream_type;
506 case V4L2_CID_MPEG_STREAM_VBI_FMT:
507 return mpeg_stream_vbi_fmt;
508 case V4L2_CID_POWER_LINE_FREQUENCY:
509 return camera_power_line_frequency;
510 case V4L2_CID_EXPOSURE_AUTO:
511 return camera_exposure_auto;
512 case V4L2_CID_EXPOSURE_METERING:
513 return camera_exposure_metering;
514 case V4L2_CID_AUTO_FOCUS_RANGE:
515 return camera_auto_focus_range;
516 case V4L2_CID_COLORFX:
517 return colorfx;
518 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
519 return auto_n_preset_white_balance;
520 case V4L2_CID_ISO_SENSITIVITY_AUTO:
521 return camera_iso_sensitivity_auto;
522 case V4L2_CID_SCENE_MODE:
523 return scene_mode;
524 case V4L2_CID_TUNE_PREEMPHASIS:
525 return tune_emphasis;
526 case V4L2_CID_TUNE_DEEMPHASIS:
527 return tune_emphasis;
528 case V4L2_CID_FLASH_LED_MODE:
529 return flash_led_mode;
530 case V4L2_CID_FLASH_STROBE_SOURCE:
531 return flash_strobe_source;
532 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
533 return header_mode;
534 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
535 return multi_slice;
536 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
537 return entropy_mode;
538 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
539 return mpeg_h264_level;
540 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
541 return h264_loop_filter;
542 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
543 return h264_profile;
544 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
545 return vui_sar_idc;
546 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
547 return h264_fp_arrangement_type;
548 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
549 return h264_fmo_map_type;
550 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
551 return mpeg_mpeg4_level;
552 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
553 return mpeg4_profile;
554 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
555 return vpx_golden_frame_sel;
556 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
557 return jpeg_chroma_subsampling;
558 case V4L2_CID_DV_TX_MODE:
559 return dv_tx_mode;
560 case V4L2_CID_DV_TX_RGB_RANGE:
561 case V4L2_CID_DV_RX_RGB_RANGE:
562 return dv_rgb_range;
563 case V4L2_CID_DETECT_MD_MODE:
564 return detect_md_mode;
565
566 default:
567 return NULL;
568 }
569 }
570 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
571
572 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
573 /*
574 * Returns NULL or an s64 type array containing the menu for given
575 * control ID. The total number of the menu items is returned in @len.
576 */
577 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
578 {
579 static const s64 qmenu_int_vpx_num_partitions[] = {
580 1, 2, 4, 8,
581 };
582
583 static const s64 qmenu_int_vpx_num_ref_frames[] = {
584 1, 2, 3,
585 };
586
587 switch (id) {
588 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
589 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
590 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
591 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
592 default:
593 *len = 0;
594 return NULL;
595 }
596 }
597 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
598
599 /* Return the control name. */
600 const char *v4l2_ctrl_get_name(u32 id)
601 {
602 switch (id) {
603 /* USER controls */
604 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
605 case V4L2_CID_USER_CLASS: return "User Controls";
606 case V4L2_CID_BRIGHTNESS: return "Brightness";
607 case V4L2_CID_CONTRAST: return "Contrast";
608 case V4L2_CID_SATURATION: return "Saturation";
609 case V4L2_CID_HUE: return "Hue";
610 case V4L2_CID_AUDIO_VOLUME: return "Volume";
611 case V4L2_CID_AUDIO_BALANCE: return "Balance";
612 case V4L2_CID_AUDIO_BASS: return "Bass";
613 case V4L2_CID_AUDIO_TREBLE: return "Treble";
614 case V4L2_CID_AUDIO_MUTE: return "Mute";
615 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
616 case V4L2_CID_BLACK_LEVEL: return "Black Level";
617 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
618 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
619 case V4L2_CID_RED_BALANCE: return "Red Balance";
620 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
621 case V4L2_CID_GAMMA: return "Gamma";
622 case V4L2_CID_EXPOSURE: return "Exposure";
623 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
624 case V4L2_CID_GAIN: return "Gain";
625 case V4L2_CID_HFLIP: return "Horizontal Flip";
626 case V4L2_CID_VFLIP: return "Vertical Flip";
627 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
628 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
629 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
630 case V4L2_CID_SHARPNESS: return "Sharpness";
631 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
632 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
633 case V4L2_CID_COLOR_KILLER: return "Color Killer";
634 case V4L2_CID_COLORFX: return "Color Effects";
635 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
636 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
637 case V4L2_CID_ROTATE: return "Rotate";
638 case V4L2_CID_BG_COLOR: return "Background Color";
639 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
640 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
641 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
642 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
643 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
644 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
645 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
646
647 /* Codec controls */
648 /* The MPEG controls are applicable to all codec controls
649 * and the 'MPEG' part of the define is historical */
650 /* Keep the order of the 'case's the same as in videodev2.h! */
651 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
652 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
653 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
654 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
655 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
656 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
657 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
658 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
659 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
660 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
661 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
662 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
663 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
664 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
665 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
666 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
667 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
668 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
669 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
670 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
671 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
672 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
673 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
674 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
675 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
676 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
677 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
678 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
679 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
680 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
681 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
682 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
683 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
684 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
685 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
686 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
687 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
688 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
689 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
690 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
691 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
692 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
693 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
694 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
695 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
696 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
697 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
698 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
699 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
700 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
701 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
702 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
703 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
704 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
705 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
706 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
707 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
708 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
709 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
710 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
711 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
712 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
713 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
714 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
715 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
716 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
717 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
718 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
719 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
720 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
721 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
722 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
723 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
724 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
725 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
726 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
727 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
728 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
729 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
730 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
731 return "H264 Set QP Value for HC Layers";
732 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
733 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
734 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
735 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
736 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
737 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
738 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
739 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
740 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
741 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
742 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
743 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
744 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
745 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
746 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
747 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
748 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
749 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
750
751 /* VPX controls */
752 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
753 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
754 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
755 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
756 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
757 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
758 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
759 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
760 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
761 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
762 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
763 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
764
765 /* CAMERA controls */
766 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
767 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
768 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
769 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
770 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
771 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
772 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
773 case V4L2_CID_PAN_RESET: return "Pan, Reset";
774 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
775 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
776 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
777 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
778 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
779 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
780 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
781 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
782 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
783 case V4L2_CID_PRIVACY: return "Privacy";
784 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
785 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
786 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
787 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
788 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
789 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
790 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
791 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
792 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
793 case V4L2_CID_SCENE_MODE: return "Scene Mode";
794 case V4L2_CID_3A_LOCK: return "3A Lock";
795 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
796 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
797 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
798 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
799
800 /* FM Radio Modulator controls */
801 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
802 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
803 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
804 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
805 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
806 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
807 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
808 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
809 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
810 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
811 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
812 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
813 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
814 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
815 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
816 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
817 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
818 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
819 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
820 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
821 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
822 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
823 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
824 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
825 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
826 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
827 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
828 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
829 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
830 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
831
832 /* Flash controls */
833 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
834 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
835 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
836 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
837 case V4L2_CID_FLASH_STROBE: return "Strobe";
838 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
839 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
840 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
841 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
842 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
843 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
844 case V4L2_CID_FLASH_FAULT: return "Faults";
845 case V4L2_CID_FLASH_CHARGE: return "Charge";
846 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
847
848 /* JPEG encoder controls */
849 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
850 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
851 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
852 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
853 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
854 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
855
856 /* Image source controls */
857 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
858 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
859 case V4L2_CID_VBLANK: return "Vertical Blanking";
860 case V4L2_CID_HBLANK: return "Horizontal Blanking";
861 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
862
863 /* Image processing controls */
864 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
865 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
866 case V4L2_CID_LINK_FREQ: return "Link Frequency";
867 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
868 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
869
870 /* DV controls */
871 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
872 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
873 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
874 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
875 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
876 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
877 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
878 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
879 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
880
881 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
882 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
883 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
884
885 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
886 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
887 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
888 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
889 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
890 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
891 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
892 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
893 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
894 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
895
896 /* Detection controls */
897 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
898 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
899 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
900 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
901 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
902 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
903
904 default:
905 return NULL;
906 }
907 }
908 EXPORT_SYMBOL(v4l2_ctrl_get_name);
909
910 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
911 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
912 {
913 *name = v4l2_ctrl_get_name(id);
914 *flags = 0;
915
916 switch (id) {
917 case V4L2_CID_AUDIO_MUTE:
918 case V4L2_CID_AUDIO_LOUDNESS:
919 case V4L2_CID_AUTO_WHITE_BALANCE:
920 case V4L2_CID_AUTOGAIN:
921 case V4L2_CID_HFLIP:
922 case V4L2_CID_VFLIP:
923 case V4L2_CID_HUE_AUTO:
924 case V4L2_CID_CHROMA_AGC:
925 case V4L2_CID_COLOR_KILLER:
926 case V4L2_CID_AUTOBRIGHTNESS:
927 case V4L2_CID_MPEG_AUDIO_MUTE:
928 case V4L2_CID_MPEG_VIDEO_MUTE:
929 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
930 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
931 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
932 case V4L2_CID_FOCUS_AUTO:
933 case V4L2_CID_PRIVACY:
934 case V4L2_CID_AUDIO_LIMITER_ENABLED:
935 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
936 case V4L2_CID_PILOT_TONE_ENABLED:
937 case V4L2_CID_ILLUMINATORS_1:
938 case V4L2_CID_ILLUMINATORS_2:
939 case V4L2_CID_FLASH_STROBE_STATUS:
940 case V4L2_CID_FLASH_CHARGE:
941 case V4L2_CID_FLASH_READY:
942 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
943 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
944 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
945 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
946 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
947 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
948 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
949 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
950 case V4L2_CID_WIDE_DYNAMIC_RANGE:
951 case V4L2_CID_IMAGE_STABILIZATION:
952 case V4L2_CID_RDS_RECEPTION:
953 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
954 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
955 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
956 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
957 case V4L2_CID_RF_TUNER_PLL_LOCK:
958 case V4L2_CID_RDS_TX_MONO_STEREO:
959 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
960 case V4L2_CID_RDS_TX_COMPRESSED:
961 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
962 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
963 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
964 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
965 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
966 *type = V4L2_CTRL_TYPE_BOOLEAN;
967 *min = 0;
968 *max = *step = 1;
969 break;
970 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
971 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
972 *type = V4L2_CTRL_TYPE_INTEGER;
973 break;
974 case V4L2_CID_PAN_RESET:
975 case V4L2_CID_TILT_RESET:
976 case V4L2_CID_FLASH_STROBE:
977 case V4L2_CID_FLASH_STROBE_STOP:
978 case V4L2_CID_AUTO_FOCUS_START:
979 case V4L2_CID_AUTO_FOCUS_STOP:
980 *type = V4L2_CTRL_TYPE_BUTTON;
981 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
982 *min = *max = *step = *def = 0;
983 break;
984 case V4L2_CID_POWER_LINE_FREQUENCY:
985 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
986 case V4L2_CID_MPEG_AUDIO_ENCODING:
987 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
988 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
989 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
990 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
991 case V4L2_CID_MPEG_AUDIO_MODE:
992 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
993 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
994 case V4L2_CID_MPEG_AUDIO_CRC:
995 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
996 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
997 case V4L2_CID_MPEG_VIDEO_ENCODING:
998 case V4L2_CID_MPEG_VIDEO_ASPECT:
999 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1000 case V4L2_CID_MPEG_STREAM_TYPE:
1001 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1002 case V4L2_CID_EXPOSURE_AUTO:
1003 case V4L2_CID_AUTO_FOCUS_RANGE:
1004 case V4L2_CID_COLORFX:
1005 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1006 case V4L2_CID_TUNE_PREEMPHASIS:
1007 case V4L2_CID_FLASH_LED_MODE:
1008 case V4L2_CID_FLASH_STROBE_SOURCE:
1009 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1010 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1011 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1012 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1013 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1014 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1015 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1016 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1017 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1018 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1019 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1020 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1021 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1022 case V4L2_CID_EXPOSURE_METERING:
1023 case V4L2_CID_SCENE_MODE:
1024 case V4L2_CID_DV_TX_MODE:
1025 case V4L2_CID_DV_TX_RGB_RANGE:
1026 case V4L2_CID_DV_RX_RGB_RANGE:
1027 case V4L2_CID_TEST_PATTERN:
1028 case V4L2_CID_TUNE_DEEMPHASIS:
1029 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1030 case V4L2_CID_DETECT_MD_MODE:
1031 *type = V4L2_CTRL_TYPE_MENU;
1032 break;
1033 case V4L2_CID_LINK_FREQ:
1034 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1035 break;
1036 case V4L2_CID_RDS_TX_PS_NAME:
1037 case V4L2_CID_RDS_TX_RADIO_TEXT:
1038 *type = V4L2_CTRL_TYPE_STRING;
1039 break;
1040 case V4L2_CID_ISO_SENSITIVITY:
1041 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1042 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1043 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1044 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1045 break;
1046 case V4L2_CID_USER_CLASS:
1047 case V4L2_CID_CAMERA_CLASS:
1048 case V4L2_CID_MPEG_CLASS:
1049 case V4L2_CID_FM_TX_CLASS:
1050 case V4L2_CID_FLASH_CLASS:
1051 case V4L2_CID_JPEG_CLASS:
1052 case V4L2_CID_IMAGE_SOURCE_CLASS:
1053 case V4L2_CID_IMAGE_PROC_CLASS:
1054 case V4L2_CID_DV_CLASS:
1055 case V4L2_CID_FM_RX_CLASS:
1056 case V4L2_CID_RF_TUNER_CLASS:
1057 case V4L2_CID_DETECT_CLASS:
1058 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1059 /* You can neither read not write these */
1060 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1061 *min = *max = *step = *def = 0;
1062 break;
1063 case V4L2_CID_BG_COLOR:
1064 *type = V4L2_CTRL_TYPE_INTEGER;
1065 *step = 1;
1066 *min = 0;
1067 /* Max is calculated as RGB888 that is 2^24 */
1068 *max = 0xFFFFFF;
1069 break;
1070 case V4L2_CID_FLASH_FAULT:
1071 case V4L2_CID_JPEG_ACTIVE_MARKER:
1072 case V4L2_CID_3A_LOCK:
1073 case V4L2_CID_AUTO_FOCUS_STATUS:
1074 case V4L2_CID_DV_TX_HOTPLUG:
1075 case V4L2_CID_DV_TX_RXSENSE:
1076 case V4L2_CID_DV_TX_EDID_PRESENT:
1077 case V4L2_CID_DV_RX_POWER_PRESENT:
1078 *type = V4L2_CTRL_TYPE_BITMASK;
1079 break;
1080 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1081 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1082 *type = V4L2_CTRL_TYPE_INTEGER;
1083 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1084 break;
1085 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1086 *type = V4L2_CTRL_TYPE_INTEGER64;
1087 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1088 *min = *def = 0;
1089 *max = 0x1ffffffffLL;
1090 *step = 1;
1091 break;
1092 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1093 *type = V4L2_CTRL_TYPE_INTEGER64;
1094 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1095 *min = *def = 0;
1096 *max = 0x7fffffffffffffffLL;
1097 *step = 1;
1098 break;
1099 case V4L2_CID_PIXEL_RATE:
1100 *type = V4L2_CTRL_TYPE_INTEGER64;
1101 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1102 break;
1103 case V4L2_CID_DETECT_MD_REGION_GRID:
1104 *type = V4L2_CTRL_TYPE_U8;
1105 break;
1106 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1107 *type = V4L2_CTRL_TYPE_U16;
1108 break;
1109 case V4L2_CID_RDS_TX_ALT_FREQS:
1110 *type = V4L2_CTRL_TYPE_U32;
1111 break;
1112 default:
1113 *type = V4L2_CTRL_TYPE_INTEGER;
1114 break;
1115 }
1116 switch (id) {
1117 case V4L2_CID_MPEG_AUDIO_ENCODING:
1118 case V4L2_CID_MPEG_AUDIO_MODE:
1119 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1120 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1121 case V4L2_CID_MPEG_STREAM_TYPE:
1122 *flags |= V4L2_CTRL_FLAG_UPDATE;
1123 break;
1124 case V4L2_CID_AUDIO_VOLUME:
1125 case V4L2_CID_AUDIO_BALANCE:
1126 case V4L2_CID_AUDIO_BASS:
1127 case V4L2_CID_AUDIO_TREBLE:
1128 case V4L2_CID_BRIGHTNESS:
1129 case V4L2_CID_CONTRAST:
1130 case V4L2_CID_SATURATION:
1131 case V4L2_CID_HUE:
1132 case V4L2_CID_RED_BALANCE:
1133 case V4L2_CID_BLUE_BALANCE:
1134 case V4L2_CID_GAMMA:
1135 case V4L2_CID_SHARPNESS:
1136 case V4L2_CID_CHROMA_GAIN:
1137 case V4L2_CID_RDS_TX_DEVIATION:
1138 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1139 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1140 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1141 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1142 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1143 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1144 case V4L2_CID_PILOT_TONE_DEVIATION:
1145 case V4L2_CID_PILOT_TONE_FREQUENCY:
1146 case V4L2_CID_TUNE_POWER_LEVEL:
1147 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1148 case V4L2_CID_RF_TUNER_LNA_GAIN:
1149 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1150 case V4L2_CID_RF_TUNER_IF_GAIN:
1151 case V4L2_CID_RF_TUNER_BANDWIDTH:
1152 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1153 *flags |= V4L2_CTRL_FLAG_SLIDER;
1154 break;
1155 case V4L2_CID_PAN_RELATIVE:
1156 case V4L2_CID_TILT_RELATIVE:
1157 case V4L2_CID_FOCUS_RELATIVE:
1158 case V4L2_CID_IRIS_RELATIVE:
1159 case V4L2_CID_ZOOM_RELATIVE:
1160 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1161 break;
1162 case V4L2_CID_FLASH_STROBE_STATUS:
1163 case V4L2_CID_AUTO_FOCUS_STATUS:
1164 case V4L2_CID_FLASH_READY:
1165 case V4L2_CID_DV_TX_HOTPLUG:
1166 case V4L2_CID_DV_TX_RXSENSE:
1167 case V4L2_CID_DV_TX_EDID_PRESENT:
1168 case V4L2_CID_DV_RX_POWER_PRESENT:
1169 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1170 break;
1171 case V4L2_CID_RF_TUNER_PLL_LOCK:
1172 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1173 break;
1174 }
1175 }
1176 EXPORT_SYMBOL(v4l2_ctrl_fill);
1177
1178 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1179 {
1180 memset(ev->reserved, 0, sizeof(ev->reserved));
1181 ev->type = V4L2_EVENT_CTRL;
1182 ev->id = ctrl->id;
1183 ev->u.ctrl.changes = changes;
1184 ev->u.ctrl.type = ctrl->type;
1185 ev->u.ctrl.flags = ctrl->flags;
1186 if (ctrl->is_ptr)
1187 ev->u.ctrl.value64 = 0;
1188 else
1189 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1190 ev->u.ctrl.minimum = ctrl->minimum;
1191 ev->u.ctrl.maximum = ctrl->maximum;
1192 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1193 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1194 ev->u.ctrl.step = 1;
1195 else
1196 ev->u.ctrl.step = ctrl->step;
1197 ev->u.ctrl.default_value = ctrl->default_value;
1198 }
1199
1200 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1201 {
1202 struct v4l2_event ev;
1203 struct v4l2_subscribed_event *sev;
1204
1205 if (list_empty(&ctrl->ev_subs))
1206 return;
1207 fill_event(&ev, ctrl, changes);
1208
1209 list_for_each_entry(sev, &ctrl->ev_subs, node)
1210 if (sev->fh != fh ||
1211 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1212 v4l2_event_queue_fh(sev->fh, &ev);
1213 }
1214
1215 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1216 union v4l2_ctrl_ptr ptr1,
1217 union v4l2_ctrl_ptr ptr2)
1218 {
1219 switch (ctrl->type) {
1220 case V4L2_CTRL_TYPE_BUTTON:
1221 return false;
1222 case V4L2_CTRL_TYPE_STRING:
1223 idx *= ctrl->elem_size;
1224 /* strings are always 0-terminated */
1225 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1226 case V4L2_CTRL_TYPE_INTEGER64:
1227 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1228 case V4L2_CTRL_TYPE_U8:
1229 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1230 case V4L2_CTRL_TYPE_U16:
1231 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1232 case V4L2_CTRL_TYPE_U32:
1233 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1234 default:
1235 if (ctrl->is_int)
1236 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1237 idx *= ctrl->elem_size;
1238 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1239 }
1240 }
1241
1242 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1243 union v4l2_ctrl_ptr ptr)
1244 {
1245 switch (ctrl->type) {
1246 case V4L2_CTRL_TYPE_STRING:
1247 idx *= ctrl->elem_size;
1248 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1249 ptr.p_char[idx + ctrl->minimum] = '\0';
1250 break;
1251 case V4L2_CTRL_TYPE_INTEGER64:
1252 ptr.p_s64[idx] = ctrl->default_value;
1253 break;
1254 case V4L2_CTRL_TYPE_INTEGER:
1255 case V4L2_CTRL_TYPE_INTEGER_MENU:
1256 case V4L2_CTRL_TYPE_MENU:
1257 case V4L2_CTRL_TYPE_BITMASK:
1258 case V4L2_CTRL_TYPE_BOOLEAN:
1259 ptr.p_s32[idx] = ctrl->default_value;
1260 break;
1261 case V4L2_CTRL_TYPE_U8:
1262 ptr.p_u8[idx] = ctrl->default_value;
1263 break;
1264 case V4L2_CTRL_TYPE_U16:
1265 ptr.p_u16[idx] = ctrl->default_value;
1266 break;
1267 case V4L2_CTRL_TYPE_U32:
1268 ptr.p_u32[idx] = ctrl->default_value;
1269 break;
1270 default:
1271 idx *= ctrl->elem_size;
1272 memset(ptr.p + idx, 0, ctrl->elem_size);
1273 break;
1274 }
1275 }
1276
1277 static void std_log(const struct v4l2_ctrl *ctrl)
1278 {
1279 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1280
1281 if (ctrl->is_array) {
1282 unsigned i;
1283
1284 for (i = 0; i < ctrl->nr_of_dims; i++)
1285 pr_cont("[%u]", ctrl->dims[i]);
1286 pr_cont(" ");
1287 }
1288
1289 switch (ctrl->type) {
1290 case V4L2_CTRL_TYPE_INTEGER:
1291 pr_cont("%d", *ptr.p_s32);
1292 break;
1293 case V4L2_CTRL_TYPE_BOOLEAN:
1294 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1295 break;
1296 case V4L2_CTRL_TYPE_MENU:
1297 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1298 break;
1299 case V4L2_CTRL_TYPE_INTEGER_MENU:
1300 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1301 break;
1302 case V4L2_CTRL_TYPE_BITMASK:
1303 pr_cont("0x%08x", *ptr.p_s32);
1304 break;
1305 case V4L2_CTRL_TYPE_INTEGER64:
1306 pr_cont("%lld", *ptr.p_s64);
1307 break;
1308 case V4L2_CTRL_TYPE_STRING:
1309 pr_cont("%s", ptr.p_char);
1310 break;
1311 case V4L2_CTRL_TYPE_U8:
1312 pr_cont("%u", (unsigned)*ptr.p_u8);
1313 break;
1314 case V4L2_CTRL_TYPE_U16:
1315 pr_cont("%u", (unsigned)*ptr.p_u16);
1316 break;
1317 case V4L2_CTRL_TYPE_U32:
1318 pr_cont("%u", (unsigned)*ptr.p_u32);
1319 break;
1320 default:
1321 pr_cont("unknown type %d", ctrl->type);
1322 break;
1323 }
1324 }
1325
1326 /*
1327 * Round towards the closest legal value. Be careful when we are
1328 * close to the maximum range of the control type to prevent
1329 * wrap-arounds.
1330 */
1331 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1332 ({ \
1333 offset_type offset; \
1334 if ((ctrl)->maximum >= 0 && \
1335 val >= (ctrl)->maximum - ((ctrl)->step / 2)) \
1336 val = (ctrl)->maximum; \
1337 else \
1338 val += (ctrl)->step / 2; \
1339 val = clamp_t(typeof(val), val, \
1340 (ctrl)->minimum, (ctrl)->maximum); \
1341 offset = (val) - (ctrl)->minimum; \
1342 offset = (ctrl)->step * (offset / (s32)(ctrl)->step); \
1343 val = (ctrl)->minimum + offset; \
1344 0; \
1345 })
1346
1347 /* Validate a new control */
1348 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1349 union v4l2_ctrl_ptr ptr)
1350 {
1351 size_t len;
1352 u64 offset;
1353 s64 val;
1354
1355 switch (ctrl->type) {
1356 case V4L2_CTRL_TYPE_INTEGER:
1357 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1358 case V4L2_CTRL_TYPE_INTEGER64:
1359 /*
1360 * We can't use the ROUND_TO_RANGE define here due to
1361 * the u64 divide that needs special care.
1362 */
1363 val = ptr.p_s64[idx];
1364 if (ctrl->maximum >= 0 && val >= ctrl->maximum - ctrl->step / 2)
1365 val = ctrl->maximum;
1366 else
1367 val += ctrl->step / 2;
1368 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1369 offset = val - ctrl->minimum;
1370 do_div(offset, ctrl->step);
1371 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1372 return 0;
1373 case V4L2_CTRL_TYPE_U8:
1374 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1375 case V4L2_CTRL_TYPE_U16:
1376 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1377 case V4L2_CTRL_TYPE_U32:
1378 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1379
1380 case V4L2_CTRL_TYPE_BOOLEAN:
1381 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1382 return 0;
1383
1384 case V4L2_CTRL_TYPE_MENU:
1385 case V4L2_CTRL_TYPE_INTEGER_MENU:
1386 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1387 return -ERANGE;
1388 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1389 return -EINVAL;
1390 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1391 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1392 return -EINVAL;
1393 return 0;
1394
1395 case V4L2_CTRL_TYPE_BITMASK:
1396 ptr.p_s32[idx] &= ctrl->maximum;
1397 return 0;
1398
1399 case V4L2_CTRL_TYPE_BUTTON:
1400 case V4L2_CTRL_TYPE_CTRL_CLASS:
1401 ptr.p_s32[idx] = 0;
1402 return 0;
1403
1404 case V4L2_CTRL_TYPE_STRING:
1405 idx *= ctrl->elem_size;
1406 len = strlen(ptr.p_char + idx);
1407 if (len < ctrl->minimum)
1408 return -ERANGE;
1409 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1410 return -ERANGE;
1411 return 0;
1412
1413 default:
1414 return -EINVAL;
1415 }
1416 }
1417
1418 static const struct v4l2_ctrl_type_ops std_type_ops = {
1419 .equal = std_equal,
1420 .init = std_init,
1421 .log = std_log,
1422 .validate = std_validate,
1423 };
1424
1425 /* Helper function: copy the given control value back to the caller */
1426 static int ptr_to_user(struct v4l2_ext_control *c,
1427 struct v4l2_ctrl *ctrl,
1428 union v4l2_ctrl_ptr ptr)
1429 {
1430 u32 len;
1431
1432 if (ctrl->is_ptr && !ctrl->is_string)
1433 return copy_to_user(c->ptr, ptr.p, c->size) ?
1434 -EFAULT : 0;
1435
1436 switch (ctrl->type) {
1437 case V4L2_CTRL_TYPE_STRING:
1438 len = strlen(ptr.p_char);
1439 if (c->size < len + 1) {
1440 c->size = ctrl->elem_size;
1441 return -ENOSPC;
1442 }
1443 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1444 -EFAULT : 0;
1445 case V4L2_CTRL_TYPE_INTEGER64:
1446 c->value64 = *ptr.p_s64;
1447 break;
1448 default:
1449 c->value = *ptr.p_s32;
1450 break;
1451 }
1452 return 0;
1453 }
1454
1455 /* Helper function: copy the current control value back to the caller */
1456 static int cur_to_user(struct v4l2_ext_control *c,
1457 struct v4l2_ctrl *ctrl)
1458 {
1459 return ptr_to_user(c, ctrl, ctrl->p_cur);
1460 }
1461
1462 /* Helper function: copy the new control value back to the caller */
1463 static int new_to_user(struct v4l2_ext_control *c,
1464 struct v4l2_ctrl *ctrl)
1465 {
1466 return ptr_to_user(c, ctrl, ctrl->p_new);
1467 }
1468
1469 /* Helper function: copy the caller-provider value to the given control value */
1470 static int user_to_ptr(struct v4l2_ext_control *c,
1471 struct v4l2_ctrl *ctrl,
1472 union v4l2_ctrl_ptr ptr)
1473 {
1474 int ret;
1475 u32 size;
1476
1477 ctrl->is_new = 1;
1478 if (ctrl->is_ptr && !ctrl->is_string) {
1479 unsigned idx;
1480
1481 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1482 if (ret || !ctrl->is_array)
1483 return ret;
1484 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1485 ctrl->type_ops->init(ctrl, idx, ptr);
1486 return 0;
1487 }
1488
1489 switch (ctrl->type) {
1490 case V4L2_CTRL_TYPE_INTEGER64:
1491 *ptr.p_s64 = c->value64;
1492 break;
1493 case V4L2_CTRL_TYPE_STRING:
1494 size = c->size;
1495 if (size == 0)
1496 return -ERANGE;
1497 if (size > ctrl->maximum + 1)
1498 size = ctrl->maximum + 1;
1499 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1500 if (!ret) {
1501 char last = ptr.p_char[size - 1];
1502
1503 ptr.p_char[size - 1] = 0;
1504 /* If the string was longer than ctrl->maximum,
1505 then return an error. */
1506 if (strlen(ptr.p_char) == ctrl->maximum && last)
1507 return -ERANGE;
1508 }
1509 return ret;
1510 default:
1511 *ptr.p_s32 = c->value;
1512 break;
1513 }
1514 return 0;
1515 }
1516
1517 /* Helper function: copy the caller-provider value as the new control value */
1518 static int user_to_new(struct v4l2_ext_control *c,
1519 struct v4l2_ctrl *ctrl)
1520 {
1521 return user_to_ptr(c, ctrl, ctrl->p_new);
1522 }
1523
1524 /* Copy the one value to another. */
1525 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1526 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1527 {
1528 if (ctrl == NULL)
1529 return;
1530 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1531 }
1532
1533 /* Copy the new value to the current value. */
1534 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1535 {
1536 bool changed;
1537
1538 if (ctrl == NULL)
1539 return;
1540
1541 /* has_changed is set by cluster_changed */
1542 changed = ctrl->has_changed;
1543 if (changed)
1544 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1545
1546 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1547 /* Note: CH_FLAGS is only set for auto clusters. */
1548 ctrl->flags &=
1549 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1550 if (!is_cur_manual(ctrl->cluster[0])) {
1551 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1552 if (ctrl->cluster[0]->has_volatiles)
1553 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1554 }
1555 fh = NULL;
1556 }
1557 if (changed || ch_flags) {
1558 /* If a control was changed that was not one of the controls
1559 modified by the application, then send the event to all. */
1560 if (!ctrl->is_new)
1561 fh = NULL;
1562 send_event(fh, ctrl,
1563 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1564 if (ctrl->call_notify && changed && ctrl->handler->notify)
1565 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1566 }
1567 }
1568
1569 /* Copy the current value to the new value */
1570 static void cur_to_new(struct v4l2_ctrl *ctrl)
1571 {
1572 if (ctrl == NULL)
1573 return;
1574 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1575 }
1576
1577 /* Return non-zero if one or more of the controls in the cluster has a new
1578 value that differs from the current value. */
1579 static int cluster_changed(struct v4l2_ctrl *master)
1580 {
1581 bool changed = false;
1582 unsigned idx;
1583 int i;
1584
1585 for (i = 0; i < master->ncontrols; i++) {
1586 struct v4l2_ctrl *ctrl = master->cluster[i];
1587 bool ctrl_changed = false;
1588
1589 if (ctrl == NULL)
1590 continue;
1591 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1592 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1593 ctrl->p_cur, ctrl->p_new);
1594 ctrl->has_changed = ctrl_changed;
1595 changed |= ctrl->has_changed;
1596 }
1597 return changed;
1598 }
1599
1600 /* Control range checking */
1601 static int check_range(enum v4l2_ctrl_type type,
1602 s64 min, s64 max, u64 step, s64 def)
1603 {
1604 switch (type) {
1605 case V4L2_CTRL_TYPE_BOOLEAN:
1606 if (step != 1 || max > 1 || min < 0)
1607 return -ERANGE;
1608 /* fall through */
1609 case V4L2_CTRL_TYPE_U8:
1610 case V4L2_CTRL_TYPE_U16:
1611 case V4L2_CTRL_TYPE_U32:
1612 case V4L2_CTRL_TYPE_INTEGER:
1613 case V4L2_CTRL_TYPE_INTEGER64:
1614 if (step == 0 || min > max || def < min || def > max)
1615 return -ERANGE;
1616 return 0;
1617 case V4L2_CTRL_TYPE_BITMASK:
1618 if (step || min || !max || (def & ~max))
1619 return -ERANGE;
1620 return 0;
1621 case V4L2_CTRL_TYPE_MENU:
1622 case V4L2_CTRL_TYPE_INTEGER_MENU:
1623 if (min > max || def < min || def > max)
1624 return -ERANGE;
1625 /* Note: step == menu_skip_mask for menu controls.
1626 So here we check if the default value is masked out. */
1627 if (step && ((1 << def) & step))
1628 return -EINVAL;
1629 return 0;
1630 case V4L2_CTRL_TYPE_STRING:
1631 if (min > max || min < 0 || step < 1 || def)
1632 return -ERANGE;
1633 return 0;
1634 default:
1635 return 0;
1636 }
1637 }
1638
1639 /* Validate a new control */
1640 static int validate_new(const struct v4l2_ctrl *ctrl,
1641 struct v4l2_ext_control *c)
1642 {
1643 union v4l2_ctrl_ptr ptr;
1644 unsigned idx;
1645 int err = 0;
1646
1647 if (!ctrl->is_ptr) {
1648 switch (ctrl->type) {
1649 case V4L2_CTRL_TYPE_INTEGER:
1650 case V4L2_CTRL_TYPE_INTEGER_MENU:
1651 case V4L2_CTRL_TYPE_MENU:
1652 case V4L2_CTRL_TYPE_BITMASK:
1653 case V4L2_CTRL_TYPE_BOOLEAN:
1654 case V4L2_CTRL_TYPE_BUTTON:
1655 case V4L2_CTRL_TYPE_CTRL_CLASS:
1656 ptr.p_s32 = &c->value;
1657 return ctrl->type_ops->validate(ctrl, 0, ptr);
1658
1659 case V4L2_CTRL_TYPE_INTEGER64:
1660 ptr.p_s64 = &c->value64;
1661 return ctrl->type_ops->validate(ctrl, 0, ptr);
1662 default:
1663 break;
1664 }
1665 }
1666 ptr.p = c->ptr;
1667 for (idx = 0; !err && idx < c->size / ctrl->elem_size; idx++)
1668 err = ctrl->type_ops->validate(ctrl, idx, ptr);
1669 return err;
1670 }
1671
1672 static inline u32 node2id(struct list_head *node)
1673 {
1674 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1675 }
1676
1677 /* Set the handler's error code if it wasn't set earlier already */
1678 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1679 {
1680 if (hdl->error == 0)
1681 hdl->error = err;
1682 return err;
1683 }
1684
1685 /* Initialize the handler */
1686 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1687 unsigned nr_of_controls_hint,
1688 struct lock_class_key *key, const char *name)
1689 {
1690 hdl->lock = &hdl->_lock;
1691 mutex_init(hdl->lock);
1692 lockdep_set_class_and_name(hdl->lock, key, name);
1693 INIT_LIST_HEAD(&hdl->ctrls);
1694 INIT_LIST_HEAD(&hdl->ctrl_refs);
1695 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1696 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1697 GFP_KERNEL);
1698 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1699 return hdl->error;
1700 }
1701 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1702
1703 /* Free all controls and control refs */
1704 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1705 {
1706 struct v4l2_ctrl_ref *ref, *next_ref;
1707 struct v4l2_ctrl *ctrl, *next_ctrl;
1708 struct v4l2_subscribed_event *sev, *next_sev;
1709
1710 if (hdl == NULL || hdl->buckets == NULL)
1711 return;
1712
1713 mutex_lock(hdl->lock);
1714 /* Free all nodes */
1715 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1716 list_del(&ref->node);
1717 kfree(ref);
1718 }
1719 /* Free all controls owned by the handler */
1720 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1721 list_del(&ctrl->node);
1722 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1723 list_del(&sev->node);
1724 kfree(ctrl);
1725 }
1726 kfree(hdl->buckets);
1727 hdl->buckets = NULL;
1728 hdl->cached = NULL;
1729 hdl->error = 0;
1730 mutex_unlock(hdl->lock);
1731 }
1732 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1733
1734 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1735 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1736 with applications that do not use the NEXT_CTRL flag.
1737
1738 We just find the n-th private user control. It's O(N), but that should not
1739 be an issue in this particular case. */
1740 static struct v4l2_ctrl_ref *find_private_ref(
1741 struct v4l2_ctrl_handler *hdl, u32 id)
1742 {
1743 struct v4l2_ctrl_ref *ref;
1744
1745 id -= V4L2_CID_PRIVATE_BASE;
1746 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1747 /* Search for private user controls that are compatible with
1748 VIDIOC_G/S_CTRL. */
1749 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1750 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1751 if (!ref->ctrl->is_int)
1752 continue;
1753 if (id == 0)
1754 return ref;
1755 id--;
1756 }
1757 }
1758 return NULL;
1759 }
1760
1761 /* Find a control with the given ID. */
1762 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1763 {
1764 struct v4l2_ctrl_ref *ref;
1765 int bucket;
1766
1767 id &= V4L2_CTRL_ID_MASK;
1768
1769 /* Old-style private controls need special handling */
1770 if (id >= V4L2_CID_PRIVATE_BASE)
1771 return find_private_ref(hdl, id);
1772 bucket = id % hdl->nr_of_buckets;
1773
1774 /* Simple optimization: cache the last control found */
1775 if (hdl->cached && hdl->cached->ctrl->id == id)
1776 return hdl->cached;
1777
1778 /* Not in cache, search the hash */
1779 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1780 while (ref && ref->ctrl->id != id)
1781 ref = ref->next;
1782
1783 if (ref)
1784 hdl->cached = ref; /* cache it! */
1785 return ref;
1786 }
1787
1788 /* Find a control with the given ID. Take the handler's lock first. */
1789 static struct v4l2_ctrl_ref *find_ref_lock(
1790 struct v4l2_ctrl_handler *hdl, u32 id)
1791 {
1792 struct v4l2_ctrl_ref *ref = NULL;
1793
1794 if (hdl) {
1795 mutex_lock(hdl->lock);
1796 ref = find_ref(hdl, id);
1797 mutex_unlock(hdl->lock);
1798 }
1799 return ref;
1800 }
1801
1802 /* Find a control with the given ID. */
1803 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1804 {
1805 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1806
1807 return ref ? ref->ctrl : NULL;
1808 }
1809 EXPORT_SYMBOL(v4l2_ctrl_find);
1810
1811 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1812 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1813 struct v4l2_ctrl *ctrl)
1814 {
1815 struct v4l2_ctrl_ref *ref;
1816 struct v4l2_ctrl_ref *new_ref;
1817 u32 id = ctrl->id;
1818 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1819 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1820
1821 /*
1822 * Automatically add the control class if it is not yet present and
1823 * the new control is not a compound control.
1824 */
1825 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1826 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1827 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1828 return hdl->error;
1829
1830 if (hdl->error)
1831 return hdl->error;
1832
1833 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1834 if (!new_ref)
1835 return handler_set_err(hdl, -ENOMEM);
1836 new_ref->ctrl = ctrl;
1837 if (ctrl->handler == hdl) {
1838 /* By default each control starts in a cluster of its own.
1839 new_ref->ctrl is basically a cluster array with one
1840 element, so that's perfect to use as the cluster pointer.
1841 But only do this for the handler that owns the control. */
1842 ctrl->cluster = &new_ref->ctrl;
1843 ctrl->ncontrols = 1;
1844 }
1845
1846 INIT_LIST_HEAD(&new_ref->node);
1847
1848 mutex_lock(hdl->lock);
1849
1850 /* Add immediately at the end of the list if the list is empty, or if
1851 the last element in the list has a lower ID.
1852 This ensures that when elements are added in ascending order the
1853 insertion is an O(1) operation. */
1854 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1855 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1856 goto insert_in_hash;
1857 }
1858
1859 /* Find insert position in sorted list */
1860 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1861 if (ref->ctrl->id < id)
1862 continue;
1863 /* Don't add duplicates */
1864 if (ref->ctrl->id == id) {
1865 kfree(new_ref);
1866 goto unlock;
1867 }
1868 list_add(&new_ref->node, ref->node.prev);
1869 break;
1870 }
1871
1872 insert_in_hash:
1873 /* Insert the control node in the hash */
1874 new_ref->next = hdl->buckets[bucket];
1875 hdl->buckets[bucket] = new_ref;
1876
1877 unlock:
1878 mutex_unlock(hdl->lock);
1879 return 0;
1880 }
1881
1882 /* Add a new control */
1883 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1884 const struct v4l2_ctrl_ops *ops,
1885 const struct v4l2_ctrl_type_ops *type_ops,
1886 u32 id, const char *name, enum v4l2_ctrl_type type,
1887 s64 min, s64 max, u64 step, s64 def,
1888 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1889 u32 flags, const char * const *qmenu,
1890 const s64 *qmenu_int, void *priv)
1891 {
1892 struct v4l2_ctrl *ctrl;
1893 unsigned sz_extra;
1894 unsigned nr_of_dims = 0;
1895 unsigned elems = 1;
1896 bool is_array;
1897 unsigned tot_ctrl_size;
1898 unsigned idx;
1899 void *data;
1900 int err;
1901
1902 if (hdl->error)
1903 return NULL;
1904
1905 while (dims && dims[nr_of_dims]) {
1906 elems *= dims[nr_of_dims];
1907 nr_of_dims++;
1908 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1909 break;
1910 }
1911 is_array = nr_of_dims > 0;
1912
1913 /* Prefill elem_size for all types handled by std_type_ops */
1914 switch (type) {
1915 case V4L2_CTRL_TYPE_INTEGER64:
1916 elem_size = sizeof(s64);
1917 break;
1918 case V4L2_CTRL_TYPE_STRING:
1919 elem_size = max + 1;
1920 break;
1921 case V4L2_CTRL_TYPE_U8:
1922 elem_size = sizeof(u8);
1923 break;
1924 case V4L2_CTRL_TYPE_U16:
1925 elem_size = sizeof(u16);
1926 break;
1927 case V4L2_CTRL_TYPE_U32:
1928 elem_size = sizeof(u32);
1929 break;
1930 default:
1931 if (type < V4L2_CTRL_COMPOUND_TYPES)
1932 elem_size = sizeof(s32);
1933 break;
1934 }
1935 tot_ctrl_size = elem_size * elems;
1936
1937 /* Sanity checks */
1938 if (id == 0 || name == NULL || !elem_size ||
1939 id >= V4L2_CID_PRIVATE_BASE ||
1940 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1941 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1942 handler_set_err(hdl, -ERANGE);
1943 return NULL;
1944 }
1945 err = check_range(type, min, max, step, def);
1946 if (err) {
1947 handler_set_err(hdl, err);
1948 return NULL;
1949 }
1950 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1951 handler_set_err(hdl, -ERANGE);
1952 return NULL;
1953 }
1954 if (is_array &&
1955 (type == V4L2_CTRL_TYPE_BUTTON ||
1956 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
1957 handler_set_err(hdl, -EINVAL);
1958 return NULL;
1959 }
1960
1961 sz_extra = 0;
1962 if (type == V4L2_CTRL_TYPE_BUTTON)
1963 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1964 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1965 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1966 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
1967 type == V4L2_CTRL_TYPE_STRING ||
1968 type >= V4L2_CTRL_COMPOUND_TYPES ||
1969 is_array)
1970 sz_extra += 2 * tot_ctrl_size;
1971
1972 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1973 if (ctrl == NULL) {
1974 handler_set_err(hdl, -ENOMEM);
1975 return NULL;
1976 }
1977
1978 INIT_LIST_HEAD(&ctrl->node);
1979 INIT_LIST_HEAD(&ctrl->ev_subs);
1980 ctrl->handler = hdl;
1981 ctrl->ops = ops;
1982 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
1983 ctrl->id = id;
1984 ctrl->name = name;
1985 ctrl->type = type;
1986 ctrl->flags = flags;
1987 ctrl->minimum = min;
1988 ctrl->maximum = max;
1989 ctrl->step = step;
1990 ctrl->default_value = def;
1991 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
1992 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
1993 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
1994 ctrl->is_array = is_array;
1995 ctrl->elems = elems;
1996 ctrl->nr_of_dims = nr_of_dims;
1997 if (nr_of_dims)
1998 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
1999 ctrl->elem_size = elem_size;
2000 if (type == V4L2_CTRL_TYPE_MENU)
2001 ctrl->qmenu = qmenu;
2002 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2003 ctrl->qmenu_int = qmenu_int;
2004 ctrl->priv = priv;
2005 ctrl->cur.val = ctrl->val = def;
2006 data = &ctrl[1];
2007
2008 if (!ctrl->is_int) {
2009 ctrl->p_new.p = data;
2010 ctrl->p_cur.p = data + tot_ctrl_size;
2011 } else {
2012 ctrl->p_new.p = &ctrl->val;
2013 ctrl->p_cur.p = &ctrl->cur.val;
2014 }
2015 for (idx = 0; idx < elems; idx++) {
2016 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2017 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2018 }
2019
2020 if (handler_new_ref(hdl, ctrl)) {
2021 kfree(ctrl);
2022 return NULL;
2023 }
2024 mutex_lock(hdl->lock);
2025 list_add_tail(&ctrl->node, &hdl->ctrls);
2026 mutex_unlock(hdl->lock);
2027 return ctrl;
2028 }
2029
2030 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2031 const struct v4l2_ctrl_config *cfg, void *priv)
2032 {
2033 bool is_menu;
2034 struct v4l2_ctrl *ctrl;
2035 const char *name = cfg->name;
2036 const char * const *qmenu = cfg->qmenu;
2037 const s64 *qmenu_int = cfg->qmenu_int;
2038 enum v4l2_ctrl_type type = cfg->type;
2039 u32 flags = cfg->flags;
2040 s64 min = cfg->min;
2041 s64 max = cfg->max;
2042 u64 step = cfg->step;
2043 s64 def = cfg->def;
2044
2045 if (name == NULL)
2046 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2047 &def, &flags);
2048
2049 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2050 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2051 if (is_menu)
2052 WARN_ON(step);
2053 else
2054 WARN_ON(cfg->menu_skip_mask);
2055 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2056 qmenu = v4l2_ctrl_get_menu(cfg->id);
2057 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2058 qmenu_int == NULL) {
2059 handler_set_err(hdl, -EINVAL);
2060 return NULL;
2061 }
2062
2063 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2064 type, min, max,
2065 is_menu ? cfg->menu_skip_mask : step, def,
2066 cfg->dims, cfg->elem_size,
2067 flags, qmenu, qmenu_int, priv);
2068 if (ctrl)
2069 ctrl->is_private = cfg->is_private;
2070 return ctrl;
2071 }
2072 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2073
2074 /* Helper function for standard non-menu controls */
2075 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2076 const struct v4l2_ctrl_ops *ops,
2077 u32 id, s64 min, s64 max, u64 step, s64 def)
2078 {
2079 const char *name;
2080 enum v4l2_ctrl_type type;
2081 u32 flags;
2082
2083 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2084 if (type == V4L2_CTRL_TYPE_MENU ||
2085 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2086 type >= V4L2_CTRL_COMPOUND_TYPES) {
2087 handler_set_err(hdl, -EINVAL);
2088 return NULL;
2089 }
2090 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2091 min, max, step, def, NULL, 0,
2092 flags, NULL, NULL, NULL);
2093 }
2094 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2095
2096 /* Helper function for standard menu controls */
2097 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2098 const struct v4l2_ctrl_ops *ops,
2099 u32 id, u8 _max, u64 mask, u8 _def)
2100 {
2101 const char * const *qmenu = NULL;
2102 const s64 *qmenu_int = NULL;
2103 unsigned int qmenu_int_len = 0;
2104 const char *name;
2105 enum v4l2_ctrl_type type;
2106 s64 min;
2107 s64 max = _max;
2108 s64 def = _def;
2109 u64 step;
2110 u32 flags;
2111
2112 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2113
2114 if (type == V4L2_CTRL_TYPE_MENU)
2115 qmenu = v4l2_ctrl_get_menu(id);
2116 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2117 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2118
2119 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2120 handler_set_err(hdl, -EINVAL);
2121 return NULL;
2122 }
2123 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2124 0, max, mask, def, NULL, 0,
2125 flags, qmenu, qmenu_int, NULL);
2126 }
2127 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2128
2129 /* Helper function for standard menu controls with driver defined menu */
2130 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2131 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2132 u64 mask, u8 _def, const char * const *qmenu)
2133 {
2134 enum v4l2_ctrl_type type;
2135 const char *name;
2136 u32 flags;
2137 u64 step;
2138 s64 min;
2139 s64 max = _max;
2140 s64 def = _def;
2141
2142 /* v4l2_ctrl_new_std_menu_items() should only be called for
2143 * standard controls without a standard menu.
2144 */
2145 if (v4l2_ctrl_get_menu(id)) {
2146 handler_set_err(hdl, -EINVAL);
2147 return NULL;
2148 }
2149
2150 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2151 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2152 handler_set_err(hdl, -EINVAL);
2153 return NULL;
2154 }
2155 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2156 0, max, mask, def, NULL, 0,
2157 flags, qmenu, NULL, NULL);
2158
2159 }
2160 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2161
2162 /* Helper function for standard integer menu controls */
2163 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2164 const struct v4l2_ctrl_ops *ops,
2165 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2166 {
2167 const char *name;
2168 enum v4l2_ctrl_type type;
2169 s64 min;
2170 u64 step;
2171 s64 max = _max;
2172 s64 def = _def;
2173 u32 flags;
2174
2175 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2176 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2177 handler_set_err(hdl, -EINVAL);
2178 return NULL;
2179 }
2180 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2181 0, max, 0, def, NULL, 0,
2182 flags, NULL, qmenu_int, NULL);
2183 }
2184 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2185
2186 /* Add a control from another handler to this handler */
2187 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
2188 struct v4l2_ctrl *ctrl)
2189 {
2190 if (hdl == NULL || hdl->error)
2191 return NULL;
2192 if (ctrl == NULL) {
2193 handler_set_err(hdl, -EINVAL);
2194 return NULL;
2195 }
2196 if (ctrl->handler == hdl)
2197 return ctrl;
2198 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
2199 }
2200 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
2201
2202 /* Add the controls from another handler to our own. */
2203 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2204 struct v4l2_ctrl_handler *add,
2205 bool (*filter)(const struct v4l2_ctrl *ctrl))
2206 {
2207 struct v4l2_ctrl_ref *ref;
2208 int ret = 0;
2209
2210 /* Do nothing if either handler is NULL or if they are the same */
2211 if (!hdl || !add || hdl == add)
2212 return 0;
2213 if (hdl->error)
2214 return hdl->error;
2215 mutex_lock(add->lock);
2216 list_for_each_entry(ref, &add->ctrl_refs, node) {
2217 struct v4l2_ctrl *ctrl = ref->ctrl;
2218
2219 /* Skip handler-private controls. */
2220 if (ctrl->is_private)
2221 continue;
2222 /* And control classes */
2223 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2224 continue;
2225 /* Filter any unwanted controls */
2226 if (filter && !filter(ctrl))
2227 continue;
2228 ret = handler_new_ref(hdl, ctrl);
2229 if (ret)
2230 break;
2231 }
2232 mutex_unlock(add->lock);
2233 return ret;
2234 }
2235 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2236
2237 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2238 {
2239 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2240 return true;
2241 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2242 return true;
2243 switch (ctrl->id) {
2244 case V4L2_CID_AUDIO_MUTE:
2245 case V4L2_CID_AUDIO_VOLUME:
2246 case V4L2_CID_AUDIO_BALANCE:
2247 case V4L2_CID_AUDIO_BASS:
2248 case V4L2_CID_AUDIO_TREBLE:
2249 case V4L2_CID_AUDIO_LOUDNESS:
2250 return true;
2251 default:
2252 break;
2253 }
2254 return false;
2255 }
2256 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2257
2258 /* Cluster controls */
2259 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2260 {
2261 bool has_volatiles = false;
2262 int i;
2263
2264 /* The first control is the master control and it must not be NULL */
2265 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2266 return;
2267
2268 for (i = 0; i < ncontrols; i++) {
2269 if (controls[i]) {
2270 controls[i]->cluster = controls;
2271 controls[i]->ncontrols = ncontrols;
2272 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2273 has_volatiles = true;
2274 }
2275 }
2276 controls[0]->has_volatiles = has_volatiles;
2277 }
2278 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2279
2280 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2281 u8 manual_val, bool set_volatile)
2282 {
2283 struct v4l2_ctrl *master = controls[0];
2284 u32 flag = 0;
2285 int i;
2286
2287 v4l2_ctrl_cluster(ncontrols, controls);
2288 WARN_ON(ncontrols <= 1);
2289 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2290 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2291 master->is_auto = true;
2292 master->has_volatiles = set_volatile;
2293 master->manual_mode_value = manual_val;
2294 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2295
2296 if (!is_cur_manual(master))
2297 flag = V4L2_CTRL_FLAG_INACTIVE |
2298 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2299
2300 for (i = 1; i < ncontrols; i++)
2301 if (controls[i])
2302 controls[i]->flags |= flag;
2303 }
2304 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2305
2306 /* Activate/deactivate a control. */
2307 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2308 {
2309 /* invert since the actual flag is called 'inactive' */
2310 bool inactive = !active;
2311 bool old;
2312
2313 if (ctrl == NULL)
2314 return;
2315
2316 if (inactive)
2317 /* set V4L2_CTRL_FLAG_INACTIVE */
2318 old = test_and_set_bit(4, &ctrl->flags);
2319 else
2320 /* clear V4L2_CTRL_FLAG_INACTIVE */
2321 old = test_and_clear_bit(4, &ctrl->flags);
2322 if (old != inactive)
2323 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2324 }
2325 EXPORT_SYMBOL(v4l2_ctrl_activate);
2326
2327 /* Grab/ungrab a control.
2328 Typically used when streaming starts and you want to grab controls,
2329 preventing the user from changing them.
2330
2331 Just call this and the framework will block any attempts to change
2332 these controls. */
2333 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2334 {
2335 bool old;
2336
2337 if (ctrl == NULL)
2338 return;
2339
2340 v4l2_ctrl_lock(ctrl);
2341 if (grabbed)
2342 /* set V4L2_CTRL_FLAG_GRABBED */
2343 old = test_and_set_bit(1, &ctrl->flags);
2344 else
2345 /* clear V4L2_CTRL_FLAG_GRABBED */
2346 old = test_and_clear_bit(1, &ctrl->flags);
2347 if (old != grabbed)
2348 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2349 v4l2_ctrl_unlock(ctrl);
2350 }
2351 EXPORT_SYMBOL(v4l2_ctrl_grab);
2352
2353 /* Log the control name and value */
2354 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2355 const char *prefix, const char *colon)
2356 {
2357 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2358 return;
2359 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2360 return;
2361
2362 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2363
2364 ctrl->type_ops->log(ctrl);
2365
2366 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2367 V4L2_CTRL_FLAG_GRABBED |
2368 V4L2_CTRL_FLAG_VOLATILE)) {
2369 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2370 pr_cont(" inactive");
2371 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2372 pr_cont(" grabbed");
2373 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2374 pr_cont(" volatile");
2375 }
2376 pr_cont("\n");
2377 }
2378
2379 /* Log all controls owned by the handler */
2380 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2381 const char *prefix)
2382 {
2383 struct v4l2_ctrl *ctrl;
2384 const char *colon = "";
2385 int len;
2386
2387 if (hdl == NULL)
2388 return;
2389 if (prefix == NULL)
2390 prefix = "";
2391 len = strlen(prefix);
2392 if (len && prefix[len - 1] != ' ')
2393 colon = ": ";
2394 mutex_lock(hdl->lock);
2395 list_for_each_entry(ctrl, &hdl->ctrls, node)
2396 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2397 log_ctrl(ctrl, prefix, colon);
2398 mutex_unlock(hdl->lock);
2399 }
2400 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2401
2402 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2403 {
2404 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2405 return 0;
2406 }
2407 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2408
2409 /* Call s_ctrl for all controls owned by the handler */
2410 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2411 {
2412 struct v4l2_ctrl *ctrl;
2413 int ret = 0;
2414
2415 if (hdl == NULL)
2416 return 0;
2417 mutex_lock(hdl->lock);
2418 list_for_each_entry(ctrl, &hdl->ctrls, node)
2419 ctrl->done = false;
2420
2421 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2422 struct v4l2_ctrl *master = ctrl->cluster[0];
2423 int i;
2424
2425 /* Skip if this control was already handled by a cluster. */
2426 /* Skip button controls and read-only controls. */
2427 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2428 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2429 continue;
2430
2431 for (i = 0; i < master->ncontrols; i++) {
2432 if (master->cluster[i]) {
2433 cur_to_new(master->cluster[i]);
2434 master->cluster[i]->is_new = 1;
2435 master->cluster[i]->done = true;
2436 }
2437 }
2438 ret = call_op(master, s_ctrl);
2439 if (ret)
2440 break;
2441 }
2442 mutex_unlock(hdl->lock);
2443 return ret;
2444 }
2445 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2446
2447 /* Implement VIDIOC_QUERY_EXT_CTRL */
2448 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2449 {
2450 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2451 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2452 struct v4l2_ctrl_ref *ref;
2453 struct v4l2_ctrl *ctrl;
2454
2455 if (hdl == NULL)
2456 return -EINVAL;
2457
2458 mutex_lock(hdl->lock);
2459
2460 /* Try to find it */
2461 ref = find_ref(hdl, id);
2462
2463 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2464 bool is_compound;
2465 /* Match any control that is not hidden */
2466 unsigned mask = 1;
2467 bool match = false;
2468
2469 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2470 /* Match any hidden control */
2471 match = true;
2472 } else if ((qc->id & next_flags) == next_flags) {
2473 /* Match any control, compound or not */
2474 mask = 0;
2475 }
2476
2477 /* Find the next control with ID > qc->id */
2478
2479 /* Did we reach the end of the control list? */
2480 if (id >= node2id(hdl->ctrl_refs.prev)) {
2481 ref = NULL; /* Yes, so there is no next control */
2482 } else if (ref) {
2483 /* We found a control with the given ID, so just get
2484 the next valid one in the list. */
2485 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2486 is_compound =
2487 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2488 if (id < ref->ctrl->id &&
2489 (is_compound & mask) == match)
2490 break;
2491 }
2492 if (&ref->node == &hdl->ctrl_refs)
2493 ref = NULL;
2494 } else {
2495 /* No control with the given ID exists, so start
2496 searching for the next largest ID. We know there
2497 is one, otherwise the first 'if' above would have
2498 been true. */
2499 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2500 is_compound =
2501 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2502 if (id < ref->ctrl->id &&
2503 (is_compound & mask) == match)
2504 break;
2505 }
2506 if (&ref->node == &hdl->ctrl_refs)
2507 ref = NULL;
2508 }
2509 }
2510 mutex_unlock(hdl->lock);
2511
2512 if (!ref)
2513 return -EINVAL;
2514
2515 ctrl = ref->ctrl;
2516 memset(qc, 0, sizeof(*qc));
2517 if (id >= V4L2_CID_PRIVATE_BASE)
2518 qc->id = id;
2519 else
2520 qc->id = ctrl->id;
2521 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2522 qc->flags = ctrl->flags;
2523 qc->type = ctrl->type;
2524 if (ctrl->is_ptr)
2525 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2526 qc->elem_size = ctrl->elem_size;
2527 qc->elems = ctrl->elems;
2528 qc->nr_of_dims = ctrl->nr_of_dims;
2529 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2530 qc->minimum = ctrl->minimum;
2531 qc->maximum = ctrl->maximum;
2532 qc->default_value = ctrl->default_value;
2533 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2534 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2535 qc->step = 1;
2536 else
2537 qc->step = ctrl->step;
2538 return 0;
2539 }
2540 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2541
2542 /* Implement VIDIOC_QUERYCTRL */
2543 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2544 {
2545 struct v4l2_query_ext_ctrl qec = { qc->id };
2546 int rc;
2547
2548 rc = v4l2_query_ext_ctrl(hdl, &qec);
2549 if (rc)
2550 return rc;
2551
2552 qc->id = qec.id;
2553 qc->type = qec.type;
2554 qc->flags = qec.flags;
2555 strlcpy(qc->name, qec.name, sizeof(qc->name));
2556 switch (qc->type) {
2557 case V4L2_CTRL_TYPE_INTEGER:
2558 case V4L2_CTRL_TYPE_BOOLEAN:
2559 case V4L2_CTRL_TYPE_MENU:
2560 case V4L2_CTRL_TYPE_INTEGER_MENU:
2561 case V4L2_CTRL_TYPE_STRING:
2562 case V4L2_CTRL_TYPE_BITMASK:
2563 qc->minimum = qec.minimum;
2564 qc->maximum = qec.maximum;
2565 qc->step = qec.step;
2566 qc->default_value = qec.default_value;
2567 break;
2568 default:
2569 qc->minimum = 0;
2570 qc->maximum = 0;
2571 qc->step = 0;
2572 qc->default_value = 0;
2573 break;
2574 }
2575 return 0;
2576 }
2577 EXPORT_SYMBOL(v4l2_queryctrl);
2578
2579 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2580 {
2581 if (qc->id & (V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND))
2582 return -EINVAL;
2583 return v4l2_queryctrl(sd->ctrl_handler, qc);
2584 }
2585 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2586
2587 /* Implement VIDIOC_QUERYMENU */
2588 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2589 {
2590 struct v4l2_ctrl *ctrl;
2591 u32 i = qm->index;
2592
2593 ctrl = v4l2_ctrl_find(hdl, qm->id);
2594 if (!ctrl)
2595 return -EINVAL;
2596
2597 qm->reserved = 0;
2598 /* Sanity checks */
2599 switch (ctrl->type) {
2600 case V4L2_CTRL_TYPE_MENU:
2601 if (ctrl->qmenu == NULL)
2602 return -EINVAL;
2603 break;
2604 case V4L2_CTRL_TYPE_INTEGER_MENU:
2605 if (ctrl->qmenu_int == NULL)
2606 return -EINVAL;
2607 break;
2608 default:
2609 return -EINVAL;
2610 }
2611
2612 if (i < ctrl->minimum || i > ctrl->maximum)
2613 return -EINVAL;
2614
2615 /* Use mask to see if this menu item should be skipped */
2616 if (ctrl->menu_skip_mask & (1 << i))
2617 return -EINVAL;
2618 /* Empty menu items should also be skipped */
2619 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2620 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2621 return -EINVAL;
2622 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2623 } else {
2624 qm->value = ctrl->qmenu_int[i];
2625 }
2626 return 0;
2627 }
2628 EXPORT_SYMBOL(v4l2_querymenu);
2629
2630 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2631 {
2632 return v4l2_querymenu(sd->ctrl_handler, qm);
2633 }
2634 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2635
2636
2637
2638 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2639
2640 It is not a fully atomic operation, just best-effort only. After all, if
2641 multiple controls have to be set through multiple i2c writes (for example)
2642 then some initial writes may succeed while others fail. Thus leaving the
2643 system in an inconsistent state. The question is how much effort you are
2644 willing to spend on trying to make something atomic that really isn't.
2645
2646 From the point of view of an application the main requirement is that
2647 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2648 error should be returned without actually affecting any controls.
2649
2650 If all the values are correct, then it is acceptable to just give up
2651 in case of low-level errors.
2652
2653 It is important though that the application can tell when only a partial
2654 configuration was done. The way we do that is through the error_idx field
2655 of struct v4l2_ext_controls: if that is equal to the count field then no
2656 controls were affected. Otherwise all controls before that index were
2657 successful in performing their 'get' or 'set' operation, the control at
2658 the given index failed, and you don't know what happened with the controls
2659 after the failed one. Since if they were part of a control cluster they
2660 could have been successfully processed (if a cluster member was encountered
2661 at index < error_idx), they could have failed (if a cluster member was at
2662 error_idx), or they may not have been processed yet (if the first cluster
2663 member appeared after error_idx).
2664
2665 It is all fairly theoretical, though. In practice all you can do is to
2666 bail out. If error_idx == count, then it is an application bug. If
2667 error_idx < count then it is only an application bug if the error code was
2668 EBUSY. That usually means that something started streaming just when you
2669 tried to set the controls. In all other cases it is a driver/hardware
2670 problem and all you can do is to retry or bail out.
2671
2672 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2673 never modifies controls the error_idx is just set to whatever control
2674 has an invalid value.
2675 */
2676
2677 /* Prepare for the extended g/s/try functions.
2678 Find the controls in the control array and do some basic checks. */
2679 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2680 struct v4l2_ext_controls *cs,
2681 struct v4l2_ctrl_helper *helpers,
2682 bool get)
2683 {
2684 struct v4l2_ctrl_helper *h;
2685 bool have_clusters = false;
2686 u32 i;
2687
2688 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2689 struct v4l2_ext_control *c = &cs->controls[i];
2690 struct v4l2_ctrl_ref *ref;
2691 struct v4l2_ctrl *ctrl;
2692 u32 id = c->id & V4L2_CTRL_ID_MASK;
2693
2694 cs->error_idx = i;
2695
2696 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2697 return -EINVAL;
2698
2699 /* Old-style private controls are not allowed for
2700 extended controls */
2701 if (id >= V4L2_CID_PRIVATE_BASE)
2702 return -EINVAL;
2703 ref = find_ref_lock(hdl, id);
2704 if (ref == NULL)
2705 return -EINVAL;
2706 ctrl = ref->ctrl;
2707 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2708 return -EINVAL;
2709
2710 if (ctrl->cluster[0]->ncontrols > 1)
2711 have_clusters = true;
2712 if (ctrl->cluster[0] != ctrl)
2713 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2714 if (ctrl->is_ptr && !ctrl->is_string) {
2715 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2716
2717 if (c->size < tot_size) {
2718 if (get) {
2719 c->size = tot_size;
2720 return -ENOSPC;
2721 }
2722 return -EFAULT;
2723 }
2724 c->size = tot_size;
2725 }
2726 /* Store the ref to the master control of the cluster */
2727 h->mref = ref;
2728 h->ctrl = ctrl;
2729 /* Initially set next to 0, meaning that there is no other
2730 control in this helper array belonging to the same
2731 cluster */
2732 h->next = 0;
2733 }
2734
2735 /* We are done if there were no controls that belong to a multi-
2736 control cluster. */
2737 if (!have_clusters)
2738 return 0;
2739
2740 /* The code below figures out in O(n) time which controls in the list
2741 belong to the same cluster. */
2742
2743 /* This has to be done with the handler lock taken. */
2744 mutex_lock(hdl->lock);
2745
2746 /* First zero the helper field in the master control references */
2747 for (i = 0; i < cs->count; i++)
2748 helpers[i].mref->helper = NULL;
2749 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2750 struct v4l2_ctrl_ref *mref = h->mref;
2751
2752 /* If the mref->helper is set, then it points to an earlier
2753 helper that belongs to the same cluster. */
2754 if (mref->helper) {
2755 /* Set the next field of mref->helper to the current
2756 index: this means that that earlier helper now
2757 points to the next helper in the same cluster. */
2758 mref->helper->next = i;
2759 /* mref should be set only for the first helper in the
2760 cluster, clear the others. */
2761 h->mref = NULL;
2762 }
2763 /* Point the mref helper to the current helper struct. */
2764 mref->helper = h;
2765 }
2766 mutex_unlock(hdl->lock);
2767 return 0;
2768 }
2769
2770 /* Handles the corner case where cs->count == 0. It checks whether the
2771 specified control class exists. If that class ID is 0, then it checks
2772 whether there are any controls at all. */
2773 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2774 {
2775 if (ctrl_class == 0)
2776 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2777 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2778 }
2779
2780
2781
2782 /* Get extended controls. Allocates the helpers array if needed. */
2783 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2784 {
2785 struct v4l2_ctrl_helper helper[4];
2786 struct v4l2_ctrl_helper *helpers = helper;
2787 int ret;
2788 int i, j;
2789
2790 cs->error_idx = cs->count;
2791 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2792
2793 if (hdl == NULL)
2794 return -EINVAL;
2795
2796 if (cs->count == 0)
2797 return class_check(hdl, cs->ctrl_class);
2798
2799 if (cs->count > ARRAY_SIZE(helper)) {
2800 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2801 GFP_KERNEL);
2802 if (helpers == NULL)
2803 return -ENOMEM;
2804 }
2805
2806 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2807 cs->error_idx = cs->count;
2808
2809 for (i = 0; !ret && i < cs->count; i++)
2810 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2811 ret = -EACCES;
2812
2813 for (i = 0; !ret && i < cs->count; i++) {
2814 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2815 struct v4l2_ctrl *ctrl) = cur_to_user;
2816 struct v4l2_ctrl *master;
2817
2818 if (helpers[i].mref == NULL)
2819 continue;
2820
2821 master = helpers[i].mref->ctrl;
2822 cs->error_idx = i;
2823
2824 v4l2_ctrl_lock(master);
2825
2826 /* g_volatile_ctrl will update the new control values */
2827 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2828 (master->has_volatiles && !is_cur_manual(master))) {
2829 for (j = 0; j < master->ncontrols; j++)
2830 cur_to_new(master->cluster[j]);
2831 ret = call_op(master, g_volatile_ctrl);
2832 ctrl_to_user = new_to_user;
2833 }
2834 /* If OK, then copy the current (for non-volatile controls)
2835 or the new (for volatile controls) control values to the
2836 caller */
2837 if (!ret) {
2838 u32 idx = i;
2839
2840 do {
2841 ret = ctrl_to_user(cs->controls + idx,
2842 helpers[idx].ctrl);
2843 idx = helpers[idx].next;
2844 } while (!ret && idx);
2845 }
2846 v4l2_ctrl_unlock(master);
2847 }
2848
2849 if (cs->count > ARRAY_SIZE(helper))
2850 kfree(helpers);
2851 return ret;
2852 }
2853 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2854
2855 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2856 {
2857 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2858 }
2859 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2860
2861 /* Helper function to get a single control */
2862 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2863 {
2864 struct v4l2_ctrl *master = ctrl->cluster[0];
2865 int ret = 0;
2866 int i;
2867
2868 /* Compound controls are not supported. The new_to_user() and
2869 * cur_to_user() calls below would need to be modified not to access
2870 * userspace memory when called from get_ctrl().
2871 */
2872 if (!ctrl->is_int)
2873 return -EINVAL;
2874
2875 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2876 return -EACCES;
2877
2878 v4l2_ctrl_lock(master);
2879 /* g_volatile_ctrl will update the current control values */
2880 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2881 for (i = 0; i < master->ncontrols; i++)
2882 cur_to_new(master->cluster[i]);
2883 ret = call_op(master, g_volatile_ctrl);
2884 new_to_user(c, ctrl);
2885 } else {
2886 cur_to_user(c, ctrl);
2887 }
2888 v4l2_ctrl_unlock(master);
2889 return ret;
2890 }
2891
2892 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2893 {
2894 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2895 struct v4l2_ext_control c;
2896 int ret;
2897
2898 if (ctrl == NULL || !ctrl->is_int)
2899 return -EINVAL;
2900 ret = get_ctrl(ctrl, &c);
2901 control->value = c.value;
2902 return ret;
2903 }
2904 EXPORT_SYMBOL(v4l2_g_ctrl);
2905
2906 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2907 {
2908 return v4l2_g_ctrl(sd->ctrl_handler, control);
2909 }
2910 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2911
2912 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2913 {
2914 struct v4l2_ext_control c;
2915
2916 /* It's a driver bug if this happens. */
2917 WARN_ON(!ctrl->is_int);
2918 c.value = 0;
2919 get_ctrl(ctrl, &c);
2920 return c.value;
2921 }
2922 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2923
2924 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2925 {
2926 struct v4l2_ext_control c;
2927
2928 /* It's a driver bug if this happens. */
2929 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2930 c.value = 0;
2931 get_ctrl(ctrl, &c);
2932 return c.value;
2933 }
2934 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2935
2936
2937 /* Core function that calls try/s_ctrl and ensures that the new value is
2938 copied to the current value on a set.
2939 Must be called with ctrl->handler->lock held. */
2940 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2941 bool set, u32 ch_flags)
2942 {
2943 bool update_flag;
2944 int ret;
2945 int i;
2946
2947 /* Go through the cluster and either validate the new value or
2948 (if no new value was set), copy the current value to the new
2949 value, ensuring a consistent view for the control ops when
2950 called. */
2951 for (i = 0; i < master->ncontrols; i++) {
2952 struct v4l2_ctrl *ctrl = master->cluster[i];
2953
2954 if (ctrl == NULL)
2955 continue;
2956
2957 if (!ctrl->is_new) {
2958 cur_to_new(ctrl);
2959 continue;
2960 }
2961 /* Check again: it may have changed since the
2962 previous check in try_or_set_ext_ctrls(). */
2963 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2964 return -EBUSY;
2965 }
2966
2967 ret = call_op(master, try_ctrl);
2968
2969 /* Don't set if there is no change */
2970 if (ret || !set || !cluster_changed(master))
2971 return ret;
2972 ret = call_op(master, s_ctrl);
2973 if (ret)
2974 return ret;
2975
2976 /* If OK, then make the new values permanent. */
2977 update_flag = is_cur_manual(master) != is_new_manual(master);
2978 for (i = 0; i < master->ncontrols; i++)
2979 new_to_cur(fh, master->cluster[i], ch_flags |
2980 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2981 return 0;
2982 }
2983
2984 /* Validate controls. */
2985 static int validate_ctrls(struct v4l2_ext_controls *cs,
2986 struct v4l2_ctrl_helper *helpers, bool set)
2987 {
2988 unsigned i;
2989 int ret = 0;
2990
2991 cs->error_idx = cs->count;
2992 for (i = 0; i < cs->count; i++) {
2993 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2994
2995 cs->error_idx = i;
2996
2997 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2998 return -EACCES;
2999 /* This test is also done in try_set_control_cluster() which
3000 is called in atomic context, so that has the final say,
3001 but it makes sense to do an up-front check as well. Once
3002 an error occurs in try_set_control_cluster() some other
3003 controls may have been set already and we want to do a
3004 best-effort to avoid that. */
3005 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3006 return -EBUSY;
3007 ret = validate_new(ctrl, &cs->controls[i]);
3008 if (ret)
3009 return ret;
3010 }
3011 return 0;
3012 }
3013
3014 /* Obtain the current volatile values of an autocluster and mark them
3015 as new. */
3016 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3017 {
3018 int i;
3019
3020 for (i = 0; i < master->ncontrols; i++)
3021 cur_to_new(master->cluster[i]);
3022 if (!call_op(master, g_volatile_ctrl))
3023 for (i = 1; i < master->ncontrols; i++)
3024 if (master->cluster[i])
3025 master->cluster[i]->is_new = 1;
3026 }
3027
3028 /* Try or try-and-set controls */
3029 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3030 struct v4l2_ext_controls *cs,
3031 bool set)
3032 {
3033 struct v4l2_ctrl_helper helper[4];
3034 struct v4l2_ctrl_helper *helpers = helper;
3035 unsigned i, j;
3036 int ret;
3037
3038 cs->error_idx = cs->count;
3039 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
3040
3041 if (hdl == NULL)
3042 return -EINVAL;
3043
3044 if (cs->count == 0)
3045 return class_check(hdl, cs->ctrl_class);
3046
3047 if (cs->count > ARRAY_SIZE(helper)) {
3048 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3049 GFP_KERNEL);
3050 if (!helpers)
3051 return -ENOMEM;
3052 }
3053 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3054 if (!ret)
3055 ret = validate_ctrls(cs, helpers, set);
3056 if (ret && set)
3057 cs->error_idx = cs->count;
3058 for (i = 0; !ret && i < cs->count; i++) {
3059 struct v4l2_ctrl *master;
3060 u32 idx = i;
3061
3062 if (helpers[i].mref == NULL)
3063 continue;
3064
3065 cs->error_idx = i;
3066 master = helpers[i].mref->ctrl;
3067 v4l2_ctrl_lock(master);
3068
3069 /* Reset the 'is_new' flags of the cluster */
3070 for (j = 0; j < master->ncontrols; j++)
3071 if (master->cluster[j])
3072 master->cluster[j]->is_new = 0;
3073
3074 /* For volatile autoclusters that are currently in auto mode
3075 we need to discover if it will be set to manual mode.
3076 If so, then we have to copy the current volatile values
3077 first since those will become the new manual values (which
3078 may be overwritten by explicit new values from this set
3079 of controls). */
3080 if (master->is_auto && master->has_volatiles &&
3081 !is_cur_manual(master)) {
3082 /* Pick an initial non-manual value */
3083 s32 new_auto_val = master->manual_mode_value + 1;
3084 u32 tmp_idx = idx;
3085
3086 do {
3087 /* Check if the auto control is part of the
3088 list, and remember the new value. */
3089 if (helpers[tmp_idx].ctrl == master)
3090 new_auto_val = cs->controls[tmp_idx].value;
3091 tmp_idx = helpers[tmp_idx].next;
3092 } while (tmp_idx);
3093 /* If the new value == the manual value, then copy
3094 the current volatile values. */
3095 if (new_auto_val == master->manual_mode_value)
3096 update_from_auto_cluster(master);
3097 }
3098
3099 /* Copy the new caller-supplied control values.
3100 user_to_new() sets 'is_new' to 1. */
3101 do {
3102 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
3103 idx = helpers[idx].next;
3104 } while (!ret && idx);
3105
3106 if (!ret)
3107 ret = try_or_set_cluster(fh, master, set, 0);
3108
3109 /* Copy the new values back to userspace. */
3110 if (!ret) {
3111 idx = i;
3112 do {
3113 ret = new_to_user(cs->controls + idx,
3114 helpers[idx].ctrl);
3115 idx = helpers[idx].next;
3116 } while (!ret && idx);
3117 }
3118 v4l2_ctrl_unlock(master);
3119 }
3120
3121 if (cs->count > ARRAY_SIZE(helper))
3122 kfree(helpers);
3123 return ret;
3124 }
3125
3126 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3127 {
3128 return try_set_ext_ctrls(NULL, hdl, cs, false);
3129 }
3130 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3131
3132 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3133 struct v4l2_ext_controls *cs)
3134 {
3135 return try_set_ext_ctrls(fh, hdl, cs, true);
3136 }
3137 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3138
3139 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3140 {
3141 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
3142 }
3143 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
3144
3145 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3146 {
3147 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
3148 }
3149 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
3150
3151 /* Helper function for VIDIOC_S_CTRL compatibility */
3152 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3153 struct v4l2_ext_control *c, u32 ch_flags)
3154 {
3155 struct v4l2_ctrl *master = ctrl->cluster[0];
3156 int i;
3157
3158 /* Reset the 'is_new' flags of the cluster */
3159 for (i = 0; i < master->ncontrols; i++)
3160 if (master->cluster[i])
3161 master->cluster[i]->is_new = 0;
3162
3163 if (c)
3164 user_to_new(c, ctrl);
3165
3166 /* For autoclusters with volatiles that are switched from auto to
3167 manual mode we have to update the current volatile values since
3168 those will become the initial manual values after such a switch. */
3169 if (master->is_auto && master->has_volatiles && ctrl == master &&
3170 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3171 update_from_auto_cluster(master);
3172
3173 ctrl->is_new = 1;
3174 return try_or_set_cluster(fh, master, true, ch_flags);
3175 }
3176
3177 /* Helper function for VIDIOC_S_CTRL compatibility */
3178 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3179 struct v4l2_ext_control *c)
3180 {
3181 int ret = validate_new(ctrl, c);
3182
3183 if (!ret) {
3184 v4l2_ctrl_lock(ctrl);
3185 ret = set_ctrl(fh, ctrl, c, 0);
3186 if (!ret)
3187 cur_to_user(c, ctrl);
3188 v4l2_ctrl_unlock(ctrl);
3189 }
3190 return ret;
3191 }
3192
3193 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3194 struct v4l2_control *control)
3195 {
3196 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3197 struct v4l2_ext_control c;
3198 int ret;
3199
3200 if (ctrl == NULL || !ctrl->is_int)
3201 return -EINVAL;
3202
3203 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3204 return -EACCES;
3205
3206 c.value = control->value;
3207 ret = set_ctrl_lock(fh, ctrl, &c);
3208 control->value = c.value;
3209 return ret;
3210 }
3211 EXPORT_SYMBOL(v4l2_s_ctrl);
3212
3213 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
3214 {
3215 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
3216 }
3217 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
3218
3219 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3220 {
3221 lockdep_assert_held(ctrl->handler->lock);
3222
3223 /* It's a driver bug if this happens. */
3224 WARN_ON(!ctrl->is_int);
3225 ctrl->val = val;
3226 return set_ctrl(NULL, ctrl, NULL, 0);
3227 }
3228 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3229
3230 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3231 {
3232 lockdep_assert_held(ctrl->handler->lock);
3233
3234 /* It's a driver bug if this happens. */
3235 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3236 *ctrl->p_new.p_s64 = val;
3237 return set_ctrl(NULL, ctrl, NULL, 0);
3238 }
3239 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3240
3241 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3242 {
3243 lockdep_assert_held(ctrl->handler->lock);
3244
3245 /* It's a driver bug if this happens. */
3246 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3247 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3248 return set_ctrl(NULL, ctrl, NULL, 0);
3249 }
3250 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3251
3252 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3253 {
3254 if (ctrl == NULL)
3255 return;
3256 if (notify == NULL) {
3257 ctrl->call_notify = 0;
3258 return;
3259 }
3260 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3261 return;
3262 ctrl->handler->notify = notify;
3263 ctrl->handler->notify_priv = priv;
3264 ctrl->call_notify = 1;
3265 }
3266 EXPORT_SYMBOL(v4l2_ctrl_notify);
3267
3268 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3269 s64 min, s64 max, u64 step, s64 def)
3270 {
3271 int ret;
3272 struct v4l2_ext_control c;
3273
3274 lockdep_assert_held(ctrl->handler->lock);
3275
3276 switch (ctrl->type) {
3277 case V4L2_CTRL_TYPE_INTEGER:
3278 case V4L2_CTRL_TYPE_INTEGER64:
3279 case V4L2_CTRL_TYPE_BOOLEAN:
3280 case V4L2_CTRL_TYPE_MENU:
3281 case V4L2_CTRL_TYPE_INTEGER_MENU:
3282 case V4L2_CTRL_TYPE_BITMASK:
3283 case V4L2_CTRL_TYPE_U8:
3284 case V4L2_CTRL_TYPE_U16:
3285 case V4L2_CTRL_TYPE_U32:
3286 if (ctrl->is_array)
3287 return -EINVAL;
3288 ret = check_range(ctrl->type, min, max, step, def);
3289 if (ret)
3290 return ret;
3291 break;
3292 default:
3293 return -EINVAL;
3294 }
3295 ctrl->minimum = min;
3296 ctrl->maximum = max;
3297 ctrl->step = step;
3298 ctrl->default_value = def;
3299 c.value = *ctrl->p_cur.p_s32;
3300 if (validate_new(ctrl, &c))
3301 c.value = def;
3302 if (c.value != *ctrl->p_cur.p_s32)
3303 ret = set_ctrl(NULL, ctrl, &c, V4L2_EVENT_CTRL_CH_RANGE);
3304 else
3305 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3306 return ret;
3307 }
3308 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3309
3310 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3311 {
3312 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3313
3314 if (ctrl == NULL)
3315 return -EINVAL;
3316
3317 v4l2_ctrl_lock(ctrl);
3318 list_add_tail(&sev->node, &ctrl->ev_subs);
3319 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3320 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3321 struct v4l2_event ev;
3322 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3323
3324 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3325 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3326 fill_event(&ev, ctrl, changes);
3327 /* Mark the queue as active, allowing this initial
3328 event to be accepted. */
3329 sev->elems = elems;
3330 v4l2_event_queue_fh(sev->fh, &ev);
3331 }
3332 v4l2_ctrl_unlock(ctrl);
3333 return 0;
3334 }
3335
3336 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3337 {
3338 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3339
3340 v4l2_ctrl_lock(ctrl);
3341 list_del(&sev->node);
3342 v4l2_ctrl_unlock(ctrl);
3343 }
3344
3345 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3346 {
3347 u32 old_changes = old->u.ctrl.changes;
3348
3349 old->u.ctrl = new->u.ctrl;
3350 old->u.ctrl.changes |= old_changes;
3351 }
3352 EXPORT_SYMBOL(v4l2_ctrl_replace);
3353
3354 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3355 {
3356 new->u.ctrl.changes |= old->u.ctrl.changes;
3357 }
3358 EXPORT_SYMBOL(v4l2_ctrl_merge);
3359
3360 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3361 .add = v4l2_ctrl_add_event,
3362 .del = v4l2_ctrl_del_event,
3363 .replace = v4l2_ctrl_replace,
3364 .merge = v4l2_ctrl_merge,
3365 };
3366 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3367
3368 int v4l2_ctrl_log_status(struct file *file, void *fh)
3369 {
3370 struct video_device *vfd = video_devdata(file);
3371 struct v4l2_fh *vfh = file->private_data;
3372
3373 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3374 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3375 vfd->v4l2_dev->name);
3376 return 0;
3377 }
3378 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3379
3380 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3381 const struct v4l2_event_subscription *sub)
3382 {
3383 if (sub->type == V4L2_EVENT_CTRL)
3384 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3385 return -EINVAL;
3386 }
3387 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3388
3389 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3390 struct v4l2_event_subscription *sub)
3391 {
3392 if (!sd->ctrl_handler)
3393 return -EINVAL;
3394 return v4l2_ctrl_subscribe_event(fh, sub);
3395 }
3396 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3397
3398 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3399 {
3400 struct v4l2_fh *fh = file->private_data;
3401
3402 if (v4l2_event_pending(fh))
3403 return POLLPRI;
3404 poll_wait(file, &fh->wait, wait);
3405 return 0;
3406 }
3407 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux kernel - Deliverables
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