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[media] s5p-mfc: Add QP setting support for vp8 encoder
[mirror_ubuntu-focal-kernel.git] / drivers / media / v4l2-core / v4l2-ctrls.c
1 /*
2 V4L2 controls framework implementation.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/ctype.h>
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-event.h>
28 #include <media/v4l2-dev.h>
29
30 #define has_op(master, op) \
31 (master->ops && master->ops->op)
32 #define call_op(master, op) \
33 (has_op(master, op) ? master->ops->op(master) : 0)
34
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl *ctrl;
41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
43 u32 next;
44 };
45
46 /* Small helper function to determine if the autocluster is set to manual
47 mode. */
48 static bool is_cur_manual(const struct v4l2_ctrl *master)
49 {
50 return master->is_auto && master->cur.val == master->manual_mode_value;
51 }
52
53 /* Same as above, but this checks the against the new value instead of the
54 current value. */
55 static bool is_new_manual(const struct v4l2_ctrl *master)
56 {
57 return master->is_auto && master->val == master->manual_mode_value;
58 }
59
60 /* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
64 const char * const *v4l2_ctrl_get_menu(u32 id)
65 {
66 static const char * const mpeg_audio_sampling_freq[] = {
67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
72 static const char * const mpeg_audio_encoding[] = {
73 "MPEG-1/2 Layer I",
74 "MPEG-1/2 Layer II",
75 "MPEG-1/2 Layer III",
76 "MPEG-2/4 AAC",
77 "AC-3",
78 NULL
79 };
80 static const char * const mpeg_audio_l1_bitrate[] = {
81 "32 kbps",
82 "64 kbps",
83 "96 kbps",
84 "128 kbps",
85 "160 kbps",
86 "192 kbps",
87 "224 kbps",
88 "256 kbps",
89 "288 kbps",
90 "320 kbps",
91 "352 kbps",
92 "384 kbps",
93 "416 kbps",
94 "448 kbps",
95 NULL
96 };
97 static const char * const mpeg_audio_l2_bitrate[] = {
98 "32 kbps",
99 "48 kbps",
100 "56 kbps",
101 "64 kbps",
102 "80 kbps",
103 "96 kbps",
104 "112 kbps",
105 "128 kbps",
106 "160 kbps",
107 "192 kbps",
108 "224 kbps",
109 "256 kbps",
110 "320 kbps",
111 "384 kbps",
112 NULL
113 };
114 static const char * const mpeg_audio_l3_bitrate[] = {
115 "32 kbps",
116 "40 kbps",
117 "48 kbps",
118 "56 kbps",
119 "64 kbps",
120 "80 kbps",
121 "96 kbps",
122 "112 kbps",
123 "128 kbps",
124 "160 kbps",
125 "192 kbps",
126 "224 kbps",
127 "256 kbps",
128 "320 kbps",
129 NULL
130 };
131 static const char * const mpeg_audio_ac3_bitrate[] = {
132 "32 kbps",
133 "40 kbps",
134 "48 kbps",
135 "56 kbps",
136 "64 kbps",
137 "80 kbps",
138 "96 kbps",
139 "112 kbps",
140 "128 kbps",
141 "160 kbps",
142 "192 kbps",
143 "224 kbps",
144 "256 kbps",
145 "320 kbps",
146 "384 kbps",
147 "448 kbps",
148 "512 kbps",
149 "576 kbps",
150 "640 kbps",
151 NULL
152 };
153 static const char * const mpeg_audio_mode[] = {
154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
160 static const char * const mpeg_audio_mode_extension[] = {
161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
167 static const char * const mpeg_audio_emphasis[] = {
168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
173 static const char * const mpeg_audio_crc[] = {
174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
178 static const char * const mpeg_audio_dec_playback[] = {
179 "Auto",
180 "Stereo",
181 "Left",
182 "Right",
183 "Mono",
184 "Swapped Stereo",
185 NULL
186 };
187 static const char * const mpeg_video_encoding[] = {
188 "MPEG-1",
189 "MPEG-2",
190 "MPEG-4 AVC",
191 NULL
192 };
193 static const char * const mpeg_video_aspect[] = {
194 "1x1",
195 "4x3",
196 "16x9",
197 "2.21x1",
198 NULL
199 };
200 static const char * const mpeg_video_bitrate_mode[] = {
201 "Variable Bitrate",
202 "Constant Bitrate",
203 NULL
204 };
205 static const char * const mpeg_stream_type[] = {
206 "MPEG-2 Program Stream",
207 "MPEG-2 Transport Stream",
208 "MPEG-1 System Stream",
209 "MPEG-2 DVD-compatible Stream",
210 "MPEG-1 VCD-compatible Stream",
211 "MPEG-2 SVCD-compatible Stream",
212 NULL
213 };
214 static const char * const mpeg_stream_vbi_fmt[] = {
215 "No VBI",
216 "Private Packet, IVTV Format",
217 NULL
218 };
219 static const char * const camera_power_line_frequency[] = {
220 "Disabled",
221 "50 Hz",
222 "60 Hz",
223 "Auto",
224 NULL
225 };
226 static const char * const camera_exposure_auto[] = {
227 "Auto Mode",
228 "Manual Mode",
229 "Shutter Priority Mode",
230 "Aperture Priority Mode",
231 NULL
232 };
233 static const char * const camera_exposure_metering[] = {
234 "Average",
235 "Center Weighted",
236 "Spot",
237 "Matrix",
238 NULL
239 };
240 static const char * const camera_auto_focus_range[] = {
241 "Auto",
242 "Normal",
243 "Macro",
244 "Infinity",
245 NULL
246 };
247 static const char * const colorfx[] = {
248 "None",
249 "Black & White",
250 "Sepia",
251 "Negative",
252 "Emboss",
253 "Sketch",
254 "Sky Blue",
255 "Grass Green",
256 "Skin Whiten",
257 "Vivid",
258 "Aqua",
259 "Art Freeze",
260 "Silhouette",
261 "Solarization",
262 "Antique",
263 "Set Cb/Cr",
264 NULL
265 };
266 static const char * const auto_n_preset_white_balance[] = {
267 "Manual",
268 "Auto",
269 "Incandescent",
270 "Fluorescent",
271 "Fluorescent H",
272 "Horizon",
273 "Daylight",
274 "Flash",
275 "Cloudy",
276 "Shade",
277 NULL,
278 };
279 static const char * const camera_iso_sensitivity_auto[] = {
280 "Manual",
281 "Auto",
282 NULL
283 };
284 static const char * const scene_mode[] = {
285 "None",
286 "Backlight",
287 "Beach/Snow",
288 "Candle Light",
289 "Dusk/Dawn",
290 "Fall Colors",
291 "Fireworks",
292 "Landscape",
293 "Night",
294 "Party/Indoor",
295 "Portrait",
296 "Sports",
297 "Sunset",
298 "Text",
299 NULL
300 };
301 static const char * const tune_emphasis[] = {
302 "None",
303 "50 Microseconds",
304 "75 Microseconds",
305 NULL,
306 };
307 static const char * const header_mode[] = {
308 "Separate Buffer",
309 "Joined With 1st Frame",
310 NULL,
311 };
312 static const char * const multi_slice[] = {
313 "Single",
314 "Max Macroblocks",
315 "Max Bytes",
316 NULL,
317 };
318 static const char * const entropy_mode[] = {
319 "CAVLC",
320 "CABAC",
321 NULL,
322 };
323 static const char * const mpeg_h264_level[] = {
324 "1",
325 "1b",
326 "1.1",
327 "1.2",
328 "1.3",
329 "2",
330 "2.1",
331 "2.2",
332 "3",
333 "3.1",
334 "3.2",
335 "4",
336 "4.1",
337 "4.2",
338 "5",
339 "5.1",
340 NULL,
341 };
342 static const char * const h264_loop_filter[] = {
343 "Enabled",
344 "Disabled",
345 "Disabled at Slice Boundary",
346 NULL,
347 };
348 static const char * const h264_profile[] = {
349 "Baseline",
350 "Constrained Baseline",
351 "Main",
352 "Extended",
353 "High",
354 "High 10",
355 "High 422",
356 "High 444 Predictive",
357 "High 10 Intra",
358 "High 422 Intra",
359 "High 444 Intra",
360 "CAVLC 444 Intra",
361 "Scalable Baseline",
362 "Scalable High",
363 "Scalable High Intra",
364 "Multiview High",
365 NULL,
366 };
367 static const char * const vui_sar_idc[] = {
368 "Unspecified",
369 "1:1",
370 "12:11",
371 "10:11",
372 "16:11",
373 "40:33",
374 "24:11",
375 "20:11",
376 "32:11",
377 "80:33",
378 "18:11",
379 "15:11",
380 "64:33",
381 "160:99",
382 "4:3",
383 "3:2",
384 "2:1",
385 "Extended SAR",
386 NULL,
387 };
388 static const char * const h264_fp_arrangement_type[] = {
389 "Checkerboard",
390 "Column",
391 "Row",
392 "Side by Side",
393 "Top Bottom",
394 "Temporal",
395 NULL,
396 };
397 static const char * const h264_fmo_map_type[] = {
398 "Interleaved Slices",
399 "Scattered Slices",
400 "Foreground with Leftover",
401 "Box Out",
402 "Raster Scan",
403 "Wipe Scan",
404 "Explicit",
405 NULL,
406 };
407 static const char * const mpeg_mpeg4_level[] = {
408 "0",
409 "0b",
410 "1",
411 "2",
412 "3",
413 "3b",
414 "4",
415 "5",
416 NULL,
417 };
418 static const char * const mpeg4_profile[] = {
419 "Simple",
420 "Advanced Simple",
421 "Core",
422 "Simple Scalable",
423 "Advanced Coding Efficiency",
424 NULL,
425 };
426
427 static const char * const vpx_golden_frame_sel[] = {
428 "Use Previous Frame",
429 "Use Previous Specific Frame",
430 NULL,
431 };
432
433 static const char * const flash_led_mode[] = {
434 "Off",
435 "Flash",
436 "Torch",
437 NULL,
438 };
439 static const char * const flash_strobe_source[] = {
440 "Software",
441 "External",
442 NULL,
443 };
444
445 static const char * const jpeg_chroma_subsampling[] = {
446 "4:4:4",
447 "4:2:2",
448 "4:2:0",
449 "4:1:1",
450 "4:1:0",
451 "Gray",
452 NULL,
453 };
454 static const char * const dv_tx_mode[] = {
455 "DVI-D",
456 "HDMI",
457 NULL,
458 };
459 static const char * const dv_rgb_range[] = {
460 "Automatic",
461 "RGB limited range (16-235)",
462 "RGB full range (0-255)",
463 NULL,
464 };
465
466
467 switch (id) {
468 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
469 return mpeg_audio_sampling_freq;
470 case V4L2_CID_MPEG_AUDIO_ENCODING:
471 return mpeg_audio_encoding;
472 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
473 return mpeg_audio_l1_bitrate;
474 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
475 return mpeg_audio_l2_bitrate;
476 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
477 return mpeg_audio_l3_bitrate;
478 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
479 return mpeg_audio_ac3_bitrate;
480 case V4L2_CID_MPEG_AUDIO_MODE:
481 return mpeg_audio_mode;
482 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
483 return mpeg_audio_mode_extension;
484 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
485 return mpeg_audio_emphasis;
486 case V4L2_CID_MPEG_AUDIO_CRC:
487 return mpeg_audio_crc;
488 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
489 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
490 return mpeg_audio_dec_playback;
491 case V4L2_CID_MPEG_VIDEO_ENCODING:
492 return mpeg_video_encoding;
493 case V4L2_CID_MPEG_VIDEO_ASPECT:
494 return mpeg_video_aspect;
495 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
496 return mpeg_video_bitrate_mode;
497 case V4L2_CID_MPEG_STREAM_TYPE:
498 return mpeg_stream_type;
499 case V4L2_CID_MPEG_STREAM_VBI_FMT:
500 return mpeg_stream_vbi_fmt;
501 case V4L2_CID_POWER_LINE_FREQUENCY:
502 return camera_power_line_frequency;
503 case V4L2_CID_EXPOSURE_AUTO:
504 return camera_exposure_auto;
505 case V4L2_CID_EXPOSURE_METERING:
506 return camera_exposure_metering;
507 case V4L2_CID_AUTO_FOCUS_RANGE:
508 return camera_auto_focus_range;
509 case V4L2_CID_COLORFX:
510 return colorfx;
511 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
512 return auto_n_preset_white_balance;
513 case V4L2_CID_ISO_SENSITIVITY_AUTO:
514 return camera_iso_sensitivity_auto;
515 case V4L2_CID_SCENE_MODE:
516 return scene_mode;
517 case V4L2_CID_TUNE_PREEMPHASIS:
518 return tune_emphasis;
519 case V4L2_CID_TUNE_DEEMPHASIS:
520 return tune_emphasis;
521 case V4L2_CID_FLASH_LED_MODE:
522 return flash_led_mode;
523 case V4L2_CID_FLASH_STROBE_SOURCE:
524 return flash_strobe_source;
525 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
526 return header_mode;
527 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
528 return multi_slice;
529 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
530 return entropy_mode;
531 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
532 return mpeg_h264_level;
533 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
534 return h264_loop_filter;
535 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
536 return h264_profile;
537 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
538 return vui_sar_idc;
539 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
540 return h264_fp_arrangement_type;
541 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
542 return h264_fmo_map_type;
543 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
544 return mpeg_mpeg4_level;
545 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
546 return mpeg4_profile;
547 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
548 return vpx_golden_frame_sel;
549 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
550 return jpeg_chroma_subsampling;
551 case V4L2_CID_DV_TX_MODE:
552 return dv_tx_mode;
553 case V4L2_CID_DV_TX_RGB_RANGE:
554 case V4L2_CID_DV_RX_RGB_RANGE:
555 return dv_rgb_range;
556
557 default:
558 return NULL;
559 }
560 }
561 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
562
563 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
564 /*
565 * Returns NULL or an s64 type array containing the menu for given
566 * control ID. The total number of the menu items is returned in @len.
567 */
568 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
569 {
570 static const s64 qmenu_int_vpx_num_partitions[] = {
571 1, 2, 4, 8,
572 };
573
574 static const s64 qmenu_int_vpx_num_ref_frames[] = {
575 1, 2, 3,
576 };
577
578 switch (id) {
579 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
580 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
581 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
582 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
583 default:
584 *len = 0;
585 return NULL;
586 }
587 }
588 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
589
590 /* Return the control name. */
591 const char *v4l2_ctrl_get_name(u32 id)
592 {
593 switch (id) {
594 /* USER controls */
595 /* Keep the order of the 'case's the same as in videodev2.h! */
596 case V4L2_CID_USER_CLASS: return "User Controls";
597 case V4L2_CID_BRIGHTNESS: return "Brightness";
598 case V4L2_CID_CONTRAST: return "Contrast";
599 case V4L2_CID_SATURATION: return "Saturation";
600 case V4L2_CID_HUE: return "Hue";
601 case V4L2_CID_AUDIO_VOLUME: return "Volume";
602 case V4L2_CID_AUDIO_BALANCE: return "Balance";
603 case V4L2_CID_AUDIO_BASS: return "Bass";
604 case V4L2_CID_AUDIO_TREBLE: return "Treble";
605 case V4L2_CID_AUDIO_MUTE: return "Mute";
606 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
607 case V4L2_CID_BLACK_LEVEL: return "Black Level";
608 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
609 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
610 case V4L2_CID_RED_BALANCE: return "Red Balance";
611 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
612 case V4L2_CID_GAMMA: return "Gamma";
613 case V4L2_CID_EXPOSURE: return "Exposure";
614 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
615 case V4L2_CID_GAIN: return "Gain";
616 case V4L2_CID_HFLIP: return "Horizontal Flip";
617 case V4L2_CID_VFLIP: return "Vertical Flip";
618 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
619 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
620 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
621 case V4L2_CID_SHARPNESS: return "Sharpness";
622 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
623 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
624 case V4L2_CID_COLOR_KILLER: return "Color Killer";
625 case V4L2_CID_COLORFX: return "Color Effects";
626 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
627 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
628 case V4L2_CID_ROTATE: return "Rotate";
629 case V4L2_CID_BG_COLOR: return "Background Color";
630 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
631 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
632 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
633 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
634 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
635 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
636 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
637
638 /* Codec controls */
639 /* The MPEG controls are applicable to all codec controls
640 * and the 'MPEG' part of the define is historical */
641 /* Keep the order of the 'case's the same as in videodev2.h! */
642 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
643 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
644 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
645 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
646 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
647 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
648 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
649 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
650 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
651 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
652 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
653 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
654 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
655 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
656 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
657 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
658 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
659 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
660 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
661 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
662 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
663 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
664 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
665 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
666 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
667 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
668 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
669 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
670 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
671 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
672 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
673 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
674 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
675 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
676 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
677 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
678 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
679 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
680 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
681 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
682 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
683 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
684 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
685 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
686 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
687 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
688 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
689 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
690 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
691 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
692 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
693 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
694 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
695 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
696 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
697 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
698 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
699 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
700 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
701 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
702 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
703 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
704 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
705 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
706 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
707 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
708 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
709 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
710 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
711 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
712 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
713 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
714 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
715 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
716 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
717 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
718 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
719 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
720 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
721 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
722 return "H264 Set QP Value for HC Layers";
723 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
724 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
725 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
726 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
727 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
728 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
729 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
730 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
731 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
732 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
733 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
734 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
735 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
736 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
737 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
738 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
739
740 /* VPX controls */
741 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
742 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
743 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
744 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
745 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
746 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
747 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
748 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
749 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
750 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
751 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
752
753 /* CAMERA controls */
754 /* Keep the order of the 'case's the same as in videodev2.h! */
755 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
756 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
757 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
758 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
759 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
760 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
761 case V4L2_CID_PAN_RESET: return "Pan, Reset";
762 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
763 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
764 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
765 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
766 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
767 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
768 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
769 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
770 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
771 case V4L2_CID_PRIVACY: return "Privacy";
772 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
773 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
774 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
775 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
776 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
777 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
778 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
779 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
780 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
781 case V4L2_CID_SCENE_MODE: return "Scene Mode";
782 case V4L2_CID_3A_LOCK: return "3A Lock";
783 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
784 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
785 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
786 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
787
788 /* FM Radio Modulator control */
789 /* Keep the order of the 'case's the same as in videodev2.h! */
790 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
791 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
792 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
793 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
794 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
795 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
796 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
797 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
798 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
799 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
800 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
801 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
802 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
803 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
804 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
805 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
806 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
807 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
808 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
809 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
810
811 /* Flash controls */
812 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
813 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
814 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
815 case V4L2_CID_FLASH_STROBE: return "Strobe";
816 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
817 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
818 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
819 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
820 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
821 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
822 case V4L2_CID_FLASH_FAULT: return "Faults";
823 case V4L2_CID_FLASH_CHARGE: return "Charge";
824 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
825
826 /* JPEG encoder controls */
827 /* Keep the order of the 'case's the same as in videodev2.h! */
828 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
829 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
830 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
831 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
832 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
833
834 /* Image source controls */
835 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
836 case V4L2_CID_VBLANK: return "Vertical Blanking";
837 case V4L2_CID_HBLANK: return "Horizontal Blanking";
838 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
839
840 /* Image processing controls */
841 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
842 case V4L2_CID_LINK_FREQ: return "Link Frequency";
843 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
844 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
845
846 /* DV controls */
847 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
848 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
849 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
850 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
851 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
852 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
853 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
854 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
855
856 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
857 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
858 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
859 default:
860 return NULL;
861 }
862 }
863 EXPORT_SYMBOL(v4l2_ctrl_get_name);
864
865 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
866 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
867 {
868 *name = v4l2_ctrl_get_name(id);
869 *flags = 0;
870
871 switch (id) {
872 case V4L2_CID_AUDIO_MUTE:
873 case V4L2_CID_AUDIO_LOUDNESS:
874 case V4L2_CID_AUTO_WHITE_BALANCE:
875 case V4L2_CID_AUTOGAIN:
876 case V4L2_CID_HFLIP:
877 case V4L2_CID_VFLIP:
878 case V4L2_CID_HUE_AUTO:
879 case V4L2_CID_CHROMA_AGC:
880 case V4L2_CID_COLOR_KILLER:
881 case V4L2_CID_AUTOBRIGHTNESS:
882 case V4L2_CID_MPEG_AUDIO_MUTE:
883 case V4L2_CID_MPEG_VIDEO_MUTE:
884 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
885 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
886 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
887 case V4L2_CID_FOCUS_AUTO:
888 case V4L2_CID_PRIVACY:
889 case V4L2_CID_AUDIO_LIMITER_ENABLED:
890 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
891 case V4L2_CID_PILOT_TONE_ENABLED:
892 case V4L2_CID_ILLUMINATORS_1:
893 case V4L2_CID_ILLUMINATORS_2:
894 case V4L2_CID_FLASH_STROBE_STATUS:
895 case V4L2_CID_FLASH_CHARGE:
896 case V4L2_CID_FLASH_READY:
897 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
898 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
899 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
900 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
901 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
902 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
903 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
904 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
905 case V4L2_CID_WIDE_DYNAMIC_RANGE:
906 case V4L2_CID_IMAGE_STABILIZATION:
907 case V4L2_CID_RDS_RECEPTION:
908 *type = V4L2_CTRL_TYPE_BOOLEAN;
909 *min = 0;
910 *max = *step = 1;
911 break;
912 case V4L2_CID_PAN_RESET:
913 case V4L2_CID_TILT_RESET:
914 case V4L2_CID_FLASH_STROBE:
915 case V4L2_CID_FLASH_STROBE_STOP:
916 case V4L2_CID_AUTO_FOCUS_START:
917 case V4L2_CID_AUTO_FOCUS_STOP:
918 *type = V4L2_CTRL_TYPE_BUTTON;
919 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
920 *min = *max = *step = *def = 0;
921 break;
922 case V4L2_CID_POWER_LINE_FREQUENCY:
923 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
924 case V4L2_CID_MPEG_AUDIO_ENCODING:
925 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
926 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
927 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
928 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
929 case V4L2_CID_MPEG_AUDIO_MODE:
930 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
931 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
932 case V4L2_CID_MPEG_AUDIO_CRC:
933 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
934 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
935 case V4L2_CID_MPEG_VIDEO_ENCODING:
936 case V4L2_CID_MPEG_VIDEO_ASPECT:
937 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
938 case V4L2_CID_MPEG_STREAM_TYPE:
939 case V4L2_CID_MPEG_STREAM_VBI_FMT:
940 case V4L2_CID_EXPOSURE_AUTO:
941 case V4L2_CID_AUTO_FOCUS_RANGE:
942 case V4L2_CID_COLORFX:
943 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
944 case V4L2_CID_TUNE_PREEMPHASIS:
945 case V4L2_CID_FLASH_LED_MODE:
946 case V4L2_CID_FLASH_STROBE_SOURCE:
947 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
948 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
949 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
950 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
951 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
952 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
953 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
954 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
955 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
956 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
957 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
958 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
959 case V4L2_CID_ISO_SENSITIVITY_AUTO:
960 case V4L2_CID_EXPOSURE_METERING:
961 case V4L2_CID_SCENE_MODE:
962 case V4L2_CID_DV_TX_MODE:
963 case V4L2_CID_DV_TX_RGB_RANGE:
964 case V4L2_CID_DV_RX_RGB_RANGE:
965 case V4L2_CID_TEST_PATTERN:
966 case V4L2_CID_TUNE_DEEMPHASIS:
967 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
968 *type = V4L2_CTRL_TYPE_MENU;
969 break;
970 case V4L2_CID_LINK_FREQ:
971 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
972 break;
973 case V4L2_CID_RDS_TX_PS_NAME:
974 case V4L2_CID_RDS_TX_RADIO_TEXT:
975 *type = V4L2_CTRL_TYPE_STRING;
976 break;
977 case V4L2_CID_ISO_SENSITIVITY:
978 case V4L2_CID_AUTO_EXPOSURE_BIAS:
979 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
980 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
981 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
982 break;
983 case V4L2_CID_USER_CLASS:
984 case V4L2_CID_CAMERA_CLASS:
985 case V4L2_CID_MPEG_CLASS:
986 case V4L2_CID_FM_TX_CLASS:
987 case V4L2_CID_FLASH_CLASS:
988 case V4L2_CID_JPEG_CLASS:
989 case V4L2_CID_IMAGE_SOURCE_CLASS:
990 case V4L2_CID_IMAGE_PROC_CLASS:
991 case V4L2_CID_DV_CLASS:
992 case V4L2_CID_FM_RX_CLASS:
993 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
994 /* You can neither read not write these */
995 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
996 *min = *max = *step = *def = 0;
997 break;
998 case V4L2_CID_BG_COLOR:
999 *type = V4L2_CTRL_TYPE_INTEGER;
1000 *step = 1;
1001 *min = 0;
1002 /* Max is calculated as RGB888 that is 2^24 */
1003 *max = 0xFFFFFF;
1004 break;
1005 case V4L2_CID_FLASH_FAULT:
1006 case V4L2_CID_JPEG_ACTIVE_MARKER:
1007 case V4L2_CID_3A_LOCK:
1008 case V4L2_CID_AUTO_FOCUS_STATUS:
1009 case V4L2_CID_DV_TX_HOTPLUG:
1010 case V4L2_CID_DV_TX_RXSENSE:
1011 case V4L2_CID_DV_TX_EDID_PRESENT:
1012 case V4L2_CID_DV_RX_POWER_PRESENT:
1013 *type = V4L2_CTRL_TYPE_BITMASK;
1014 break;
1015 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1016 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1017 *type = V4L2_CTRL_TYPE_INTEGER;
1018 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1019 break;
1020 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1021 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1022 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1023 /* Fall through */
1024 case V4L2_CID_PIXEL_RATE:
1025 *type = V4L2_CTRL_TYPE_INTEGER64;
1026 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1027 *min = *max = *step = *def = 0;
1028 break;
1029 default:
1030 *type = V4L2_CTRL_TYPE_INTEGER;
1031 break;
1032 }
1033 switch (id) {
1034 case V4L2_CID_MPEG_AUDIO_ENCODING:
1035 case V4L2_CID_MPEG_AUDIO_MODE:
1036 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1037 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1038 case V4L2_CID_MPEG_STREAM_TYPE:
1039 *flags |= V4L2_CTRL_FLAG_UPDATE;
1040 break;
1041 case V4L2_CID_AUDIO_VOLUME:
1042 case V4L2_CID_AUDIO_BALANCE:
1043 case V4L2_CID_AUDIO_BASS:
1044 case V4L2_CID_AUDIO_TREBLE:
1045 case V4L2_CID_BRIGHTNESS:
1046 case V4L2_CID_CONTRAST:
1047 case V4L2_CID_SATURATION:
1048 case V4L2_CID_HUE:
1049 case V4L2_CID_RED_BALANCE:
1050 case V4L2_CID_BLUE_BALANCE:
1051 case V4L2_CID_GAMMA:
1052 case V4L2_CID_SHARPNESS:
1053 case V4L2_CID_CHROMA_GAIN:
1054 case V4L2_CID_RDS_TX_DEVIATION:
1055 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1056 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1057 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1058 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1059 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1060 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1061 case V4L2_CID_PILOT_TONE_DEVIATION:
1062 case V4L2_CID_PILOT_TONE_FREQUENCY:
1063 case V4L2_CID_TUNE_POWER_LEVEL:
1064 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1065 *flags |= V4L2_CTRL_FLAG_SLIDER;
1066 break;
1067 case V4L2_CID_PAN_RELATIVE:
1068 case V4L2_CID_TILT_RELATIVE:
1069 case V4L2_CID_FOCUS_RELATIVE:
1070 case V4L2_CID_IRIS_RELATIVE:
1071 case V4L2_CID_ZOOM_RELATIVE:
1072 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1073 break;
1074 case V4L2_CID_FLASH_STROBE_STATUS:
1075 case V4L2_CID_AUTO_FOCUS_STATUS:
1076 case V4L2_CID_FLASH_READY:
1077 case V4L2_CID_DV_TX_HOTPLUG:
1078 case V4L2_CID_DV_TX_RXSENSE:
1079 case V4L2_CID_DV_TX_EDID_PRESENT:
1080 case V4L2_CID_DV_RX_POWER_PRESENT:
1081 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1082 break;
1083 }
1084 }
1085 EXPORT_SYMBOL(v4l2_ctrl_fill);
1086
1087 /* Helper function to determine whether the control type is compatible with
1088 VIDIOC_G/S_CTRL. */
1089 static bool type_is_int(const struct v4l2_ctrl *ctrl)
1090 {
1091 switch (ctrl->type) {
1092 case V4L2_CTRL_TYPE_INTEGER64:
1093 case V4L2_CTRL_TYPE_STRING:
1094 /* Nope, these need v4l2_ext_control */
1095 return false;
1096 default:
1097 return true;
1098 }
1099 }
1100
1101 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1102 {
1103 memset(ev->reserved, 0, sizeof(ev->reserved));
1104 ev->type = V4L2_EVENT_CTRL;
1105 ev->id = ctrl->id;
1106 ev->u.ctrl.changes = changes;
1107 ev->u.ctrl.type = ctrl->type;
1108 ev->u.ctrl.flags = ctrl->flags;
1109 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
1110 ev->u.ctrl.value64 = 0;
1111 else
1112 ev->u.ctrl.value64 = ctrl->cur.val64;
1113 ev->u.ctrl.minimum = ctrl->minimum;
1114 ev->u.ctrl.maximum = ctrl->maximum;
1115 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1116 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1117 ev->u.ctrl.step = 1;
1118 else
1119 ev->u.ctrl.step = ctrl->step;
1120 ev->u.ctrl.default_value = ctrl->default_value;
1121 }
1122
1123 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1124 {
1125 struct v4l2_event ev;
1126 struct v4l2_subscribed_event *sev;
1127
1128 if (list_empty(&ctrl->ev_subs))
1129 return;
1130 fill_event(&ev, ctrl, changes);
1131
1132 list_for_each_entry(sev, &ctrl->ev_subs, node)
1133 if (sev->fh != fh ||
1134 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1135 v4l2_event_queue_fh(sev->fh, &ev);
1136 }
1137
1138 /* Helper function: copy the current control value back to the caller */
1139 static int cur_to_user(struct v4l2_ext_control *c,
1140 struct v4l2_ctrl *ctrl)
1141 {
1142 u32 len;
1143
1144 switch (ctrl->type) {
1145 case V4L2_CTRL_TYPE_STRING:
1146 len = strlen(ctrl->cur.string);
1147 if (c->size < len + 1) {
1148 c->size = len + 1;
1149 return -ENOSPC;
1150 }
1151 return copy_to_user(c->string, ctrl->cur.string,
1152 len + 1) ? -EFAULT : 0;
1153 case V4L2_CTRL_TYPE_INTEGER64:
1154 c->value64 = ctrl->cur.val64;
1155 break;
1156 default:
1157 c->value = ctrl->cur.val;
1158 break;
1159 }
1160 return 0;
1161 }
1162
1163 /* Helper function: copy the caller-provider value as the new control value */
1164 static int user_to_new(struct v4l2_ext_control *c,
1165 struct v4l2_ctrl *ctrl)
1166 {
1167 int ret;
1168 u32 size;
1169
1170 ctrl->is_new = 1;
1171 switch (ctrl->type) {
1172 case V4L2_CTRL_TYPE_INTEGER64:
1173 ctrl->val64 = c->value64;
1174 break;
1175 case V4L2_CTRL_TYPE_STRING:
1176 size = c->size;
1177 if (size == 0)
1178 return -ERANGE;
1179 if (size > ctrl->maximum + 1)
1180 size = ctrl->maximum + 1;
1181 ret = copy_from_user(ctrl->string, c->string, size);
1182 if (!ret) {
1183 char last = ctrl->string[size - 1];
1184
1185 ctrl->string[size - 1] = 0;
1186 /* If the string was longer than ctrl->maximum,
1187 then return an error. */
1188 if (strlen(ctrl->string) == ctrl->maximum && last)
1189 return -ERANGE;
1190 }
1191 return ret ? -EFAULT : 0;
1192 default:
1193 ctrl->val = c->value;
1194 break;
1195 }
1196 return 0;
1197 }
1198
1199 /* Helper function: copy the new control value back to the caller */
1200 static int new_to_user(struct v4l2_ext_control *c,
1201 struct v4l2_ctrl *ctrl)
1202 {
1203 u32 len;
1204
1205 switch (ctrl->type) {
1206 case V4L2_CTRL_TYPE_STRING:
1207 len = strlen(ctrl->string);
1208 if (c->size < len + 1) {
1209 c->size = ctrl->maximum + 1;
1210 return -ENOSPC;
1211 }
1212 return copy_to_user(c->string, ctrl->string,
1213 len + 1) ? -EFAULT : 0;
1214 case V4L2_CTRL_TYPE_INTEGER64:
1215 c->value64 = ctrl->val64;
1216 break;
1217 default:
1218 c->value = ctrl->val;
1219 break;
1220 }
1221 return 0;
1222 }
1223
1224 /* Copy the new value to the current value. */
1225 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1226 {
1227 bool changed = false;
1228
1229 if (ctrl == NULL)
1230 return;
1231 switch (ctrl->type) {
1232 case V4L2_CTRL_TYPE_BUTTON:
1233 changed = true;
1234 break;
1235 case V4L2_CTRL_TYPE_STRING:
1236 /* strings are always 0-terminated */
1237 changed = strcmp(ctrl->string, ctrl->cur.string);
1238 strcpy(ctrl->cur.string, ctrl->string);
1239 break;
1240 case V4L2_CTRL_TYPE_INTEGER64:
1241 changed = ctrl->val64 != ctrl->cur.val64;
1242 ctrl->cur.val64 = ctrl->val64;
1243 break;
1244 default:
1245 changed = ctrl->val != ctrl->cur.val;
1246 ctrl->cur.val = ctrl->val;
1247 break;
1248 }
1249 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1250 /* Note: CH_FLAGS is only set for auto clusters. */
1251 ctrl->flags &=
1252 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1253 if (!is_cur_manual(ctrl->cluster[0])) {
1254 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1255 if (ctrl->cluster[0]->has_volatiles)
1256 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1257 }
1258 fh = NULL;
1259 }
1260 if (changed || ch_flags) {
1261 /* If a control was changed that was not one of the controls
1262 modified by the application, then send the event to all. */
1263 if (!ctrl->is_new)
1264 fh = NULL;
1265 send_event(fh, ctrl,
1266 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1267 if (ctrl->call_notify && changed && ctrl->handler->notify)
1268 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1269 }
1270 }
1271
1272 /* Copy the current value to the new value */
1273 static void cur_to_new(struct v4l2_ctrl *ctrl)
1274 {
1275 if (ctrl == NULL)
1276 return;
1277 switch (ctrl->type) {
1278 case V4L2_CTRL_TYPE_STRING:
1279 /* strings are always 0-terminated */
1280 strcpy(ctrl->string, ctrl->cur.string);
1281 break;
1282 case V4L2_CTRL_TYPE_INTEGER64:
1283 ctrl->val64 = ctrl->cur.val64;
1284 break;
1285 default:
1286 ctrl->val = ctrl->cur.val;
1287 break;
1288 }
1289 }
1290
1291 /* Return non-zero if one or more of the controls in the cluster has a new
1292 value that differs from the current value. */
1293 static int cluster_changed(struct v4l2_ctrl *master)
1294 {
1295 int diff = 0;
1296 int i;
1297
1298 for (i = 0; !diff && i < master->ncontrols; i++) {
1299 struct v4l2_ctrl *ctrl = master->cluster[i];
1300
1301 if (ctrl == NULL)
1302 continue;
1303 switch (ctrl->type) {
1304 case V4L2_CTRL_TYPE_BUTTON:
1305 /* Button controls are always 'different' */
1306 return 1;
1307 case V4L2_CTRL_TYPE_STRING:
1308 /* strings are always 0-terminated */
1309 diff = strcmp(ctrl->string, ctrl->cur.string);
1310 break;
1311 case V4L2_CTRL_TYPE_INTEGER64:
1312 diff = ctrl->val64 != ctrl->cur.val64;
1313 break;
1314 default:
1315 diff = ctrl->val != ctrl->cur.val;
1316 break;
1317 }
1318 }
1319 return diff;
1320 }
1321
1322 /* Control range checking */
1323 static int check_range(enum v4l2_ctrl_type type,
1324 s32 min, s32 max, u32 step, s32 def)
1325 {
1326 switch (type) {
1327 case V4L2_CTRL_TYPE_BOOLEAN:
1328 if (step != 1 || max > 1 || min < 0)
1329 return -ERANGE;
1330 /* fall through */
1331 case V4L2_CTRL_TYPE_INTEGER:
1332 if (step <= 0 || min > max || def < min || def > max)
1333 return -ERANGE;
1334 return 0;
1335 case V4L2_CTRL_TYPE_BITMASK:
1336 if (step || min || !max || (def & ~max))
1337 return -ERANGE;
1338 return 0;
1339 case V4L2_CTRL_TYPE_MENU:
1340 case V4L2_CTRL_TYPE_INTEGER_MENU:
1341 if (min > max || def < min || def > max)
1342 return -ERANGE;
1343 /* Note: step == menu_skip_mask for menu controls.
1344 So here we check if the default value is masked out. */
1345 if (step && ((1 << def) & step))
1346 return -EINVAL;
1347 return 0;
1348 case V4L2_CTRL_TYPE_STRING:
1349 if (min > max || min < 0 || step < 1 || def)
1350 return -ERANGE;
1351 return 0;
1352 default:
1353 return 0;
1354 }
1355 }
1356
1357 /* Validate a new control */
1358 static int validate_new(const struct v4l2_ctrl *ctrl,
1359 struct v4l2_ext_control *c)
1360 {
1361 size_t len;
1362 u32 offset;
1363 s32 val;
1364
1365 switch (ctrl->type) {
1366 case V4L2_CTRL_TYPE_INTEGER:
1367 /* Round towards the closest legal value */
1368 val = c->value + ctrl->step / 2;
1369 val = clamp(val, ctrl->minimum, ctrl->maximum);
1370 offset = val - ctrl->minimum;
1371 offset = ctrl->step * (offset / ctrl->step);
1372 c->value = ctrl->minimum + offset;
1373 return 0;
1374
1375 case V4L2_CTRL_TYPE_BOOLEAN:
1376 c->value = !!c->value;
1377 return 0;
1378
1379 case V4L2_CTRL_TYPE_MENU:
1380 case V4L2_CTRL_TYPE_INTEGER_MENU:
1381 if (c->value < ctrl->minimum || c->value > ctrl->maximum)
1382 return -ERANGE;
1383 if (ctrl->menu_skip_mask & (1 << c->value))
1384 return -EINVAL;
1385 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1386 ctrl->qmenu[c->value][0] == '\0')
1387 return -EINVAL;
1388 return 0;
1389
1390 case V4L2_CTRL_TYPE_BITMASK:
1391 c->value &= ctrl->maximum;
1392 return 0;
1393
1394 case V4L2_CTRL_TYPE_BUTTON:
1395 case V4L2_CTRL_TYPE_CTRL_CLASS:
1396 c->value = 0;
1397 return 0;
1398
1399 case V4L2_CTRL_TYPE_INTEGER64:
1400 return 0;
1401
1402 case V4L2_CTRL_TYPE_STRING:
1403 len = strlen(c->string);
1404 if (len < ctrl->minimum)
1405 return -ERANGE;
1406 if ((len - ctrl->minimum) % ctrl->step)
1407 return -ERANGE;
1408 return 0;
1409
1410 default:
1411 return -EINVAL;
1412 }
1413 }
1414
1415 static inline u32 node2id(struct list_head *node)
1416 {
1417 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1418 }
1419
1420 /* Set the handler's error code if it wasn't set earlier already */
1421 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1422 {
1423 if (hdl->error == 0)
1424 hdl->error = err;
1425 return err;
1426 }
1427
1428 /* Initialize the handler */
1429 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1430 unsigned nr_of_controls_hint,
1431 struct lock_class_key *key, const char *name)
1432 {
1433 hdl->lock = &hdl->_lock;
1434 mutex_init(hdl->lock);
1435 lockdep_set_class_and_name(hdl->lock, key, name);
1436 INIT_LIST_HEAD(&hdl->ctrls);
1437 INIT_LIST_HEAD(&hdl->ctrl_refs);
1438 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1439 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1440 GFP_KERNEL);
1441 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1442 return hdl->error;
1443 }
1444 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1445
1446 /* Free all controls and control refs */
1447 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1448 {
1449 struct v4l2_ctrl_ref *ref, *next_ref;
1450 struct v4l2_ctrl *ctrl, *next_ctrl;
1451 struct v4l2_subscribed_event *sev, *next_sev;
1452
1453 if (hdl == NULL || hdl->buckets == NULL)
1454 return;
1455
1456 mutex_lock(hdl->lock);
1457 /* Free all nodes */
1458 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1459 list_del(&ref->node);
1460 kfree(ref);
1461 }
1462 /* Free all controls owned by the handler */
1463 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1464 list_del(&ctrl->node);
1465 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1466 list_del(&sev->node);
1467 kfree(ctrl);
1468 }
1469 kfree(hdl->buckets);
1470 hdl->buckets = NULL;
1471 hdl->cached = NULL;
1472 hdl->error = 0;
1473 mutex_unlock(hdl->lock);
1474 }
1475 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1476
1477 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1478 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1479 with applications that do not use the NEXT_CTRL flag.
1480
1481 We just find the n-th private user control. It's O(N), but that should not
1482 be an issue in this particular case. */
1483 static struct v4l2_ctrl_ref *find_private_ref(
1484 struct v4l2_ctrl_handler *hdl, u32 id)
1485 {
1486 struct v4l2_ctrl_ref *ref;
1487
1488 id -= V4L2_CID_PRIVATE_BASE;
1489 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1490 /* Search for private user controls that are compatible with
1491 VIDIOC_G/S_CTRL. */
1492 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1493 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1494 if (!type_is_int(ref->ctrl))
1495 continue;
1496 if (id == 0)
1497 return ref;
1498 id--;
1499 }
1500 }
1501 return NULL;
1502 }
1503
1504 /* Find a control with the given ID. */
1505 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1506 {
1507 struct v4l2_ctrl_ref *ref;
1508 int bucket;
1509
1510 id &= V4L2_CTRL_ID_MASK;
1511
1512 /* Old-style private controls need special handling */
1513 if (id >= V4L2_CID_PRIVATE_BASE)
1514 return find_private_ref(hdl, id);
1515 bucket = id % hdl->nr_of_buckets;
1516
1517 /* Simple optimization: cache the last control found */
1518 if (hdl->cached && hdl->cached->ctrl->id == id)
1519 return hdl->cached;
1520
1521 /* Not in cache, search the hash */
1522 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1523 while (ref && ref->ctrl->id != id)
1524 ref = ref->next;
1525
1526 if (ref)
1527 hdl->cached = ref; /* cache it! */
1528 return ref;
1529 }
1530
1531 /* Find a control with the given ID. Take the handler's lock first. */
1532 static struct v4l2_ctrl_ref *find_ref_lock(
1533 struct v4l2_ctrl_handler *hdl, u32 id)
1534 {
1535 struct v4l2_ctrl_ref *ref = NULL;
1536
1537 if (hdl) {
1538 mutex_lock(hdl->lock);
1539 ref = find_ref(hdl, id);
1540 mutex_unlock(hdl->lock);
1541 }
1542 return ref;
1543 }
1544
1545 /* Find a control with the given ID. */
1546 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1547 {
1548 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1549
1550 return ref ? ref->ctrl : NULL;
1551 }
1552 EXPORT_SYMBOL(v4l2_ctrl_find);
1553
1554 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1555 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1556 struct v4l2_ctrl *ctrl)
1557 {
1558 struct v4l2_ctrl_ref *ref;
1559 struct v4l2_ctrl_ref *new_ref;
1560 u32 id = ctrl->id;
1561 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1562 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1563
1564 /* Automatically add the control class if it is not yet present. */
1565 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1566 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1567 return hdl->error;
1568
1569 if (hdl->error)
1570 return hdl->error;
1571
1572 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1573 if (!new_ref)
1574 return handler_set_err(hdl, -ENOMEM);
1575 new_ref->ctrl = ctrl;
1576 if (ctrl->handler == hdl) {
1577 /* By default each control starts in a cluster of its own.
1578 new_ref->ctrl is basically a cluster array with one
1579 element, so that's perfect to use as the cluster pointer.
1580 But only do this for the handler that owns the control. */
1581 ctrl->cluster = &new_ref->ctrl;
1582 ctrl->ncontrols = 1;
1583 }
1584
1585 INIT_LIST_HEAD(&new_ref->node);
1586
1587 mutex_lock(hdl->lock);
1588
1589 /* Add immediately at the end of the list if the list is empty, or if
1590 the last element in the list has a lower ID.
1591 This ensures that when elements are added in ascending order the
1592 insertion is an O(1) operation. */
1593 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1594 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1595 goto insert_in_hash;
1596 }
1597
1598 /* Find insert position in sorted list */
1599 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1600 if (ref->ctrl->id < id)
1601 continue;
1602 /* Don't add duplicates */
1603 if (ref->ctrl->id == id) {
1604 kfree(new_ref);
1605 goto unlock;
1606 }
1607 list_add(&new_ref->node, ref->node.prev);
1608 break;
1609 }
1610
1611 insert_in_hash:
1612 /* Insert the control node in the hash */
1613 new_ref->next = hdl->buckets[bucket];
1614 hdl->buckets[bucket] = new_ref;
1615
1616 unlock:
1617 mutex_unlock(hdl->lock);
1618 return 0;
1619 }
1620
1621 /* Add a new control */
1622 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1623 const struct v4l2_ctrl_ops *ops,
1624 u32 id, const char *name, enum v4l2_ctrl_type type,
1625 s32 min, s32 max, u32 step, s32 def,
1626 u32 flags, const char * const *qmenu,
1627 const s64 *qmenu_int, void *priv)
1628 {
1629 struct v4l2_ctrl *ctrl;
1630 unsigned sz_extra = 0;
1631 int err;
1632
1633 if (hdl->error)
1634 return NULL;
1635
1636 /* Sanity checks */
1637 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1638 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1639 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1640 handler_set_err(hdl, -ERANGE);
1641 return NULL;
1642 }
1643 err = check_range(type, min, max, step, def);
1644 if (err) {
1645 handler_set_err(hdl, err);
1646 return NULL;
1647 }
1648 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1649 handler_set_err(hdl, -ERANGE);
1650 return NULL;
1651 }
1652
1653 if (type == V4L2_CTRL_TYPE_BUTTON)
1654 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1655 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1656 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1657 else if (type == V4L2_CTRL_TYPE_STRING)
1658 sz_extra += 2 * (max + 1);
1659
1660 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1661 if (ctrl == NULL) {
1662 handler_set_err(hdl, -ENOMEM);
1663 return NULL;
1664 }
1665
1666 INIT_LIST_HEAD(&ctrl->node);
1667 INIT_LIST_HEAD(&ctrl->ev_subs);
1668 ctrl->handler = hdl;
1669 ctrl->ops = ops;
1670 ctrl->id = id;
1671 ctrl->name = name;
1672 ctrl->type = type;
1673 ctrl->flags = flags;
1674 ctrl->minimum = min;
1675 ctrl->maximum = max;
1676 ctrl->step = step;
1677 if (type == V4L2_CTRL_TYPE_MENU)
1678 ctrl->qmenu = qmenu;
1679 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1680 ctrl->qmenu_int = qmenu_int;
1681 ctrl->priv = priv;
1682 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1683
1684 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1685 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1686 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1687 if (ctrl->minimum)
1688 memset(ctrl->cur.string, ' ', ctrl->minimum);
1689 }
1690 if (handler_new_ref(hdl, ctrl)) {
1691 kfree(ctrl);
1692 return NULL;
1693 }
1694 mutex_lock(hdl->lock);
1695 list_add_tail(&ctrl->node, &hdl->ctrls);
1696 mutex_unlock(hdl->lock);
1697 return ctrl;
1698 }
1699
1700 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1701 const struct v4l2_ctrl_config *cfg, void *priv)
1702 {
1703 bool is_menu;
1704 struct v4l2_ctrl *ctrl;
1705 const char *name = cfg->name;
1706 const char * const *qmenu = cfg->qmenu;
1707 const s64 *qmenu_int = cfg->qmenu_int;
1708 enum v4l2_ctrl_type type = cfg->type;
1709 u32 flags = cfg->flags;
1710 s32 min = cfg->min;
1711 s32 max = cfg->max;
1712 u32 step = cfg->step;
1713 s32 def = cfg->def;
1714
1715 if (name == NULL)
1716 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1717 &def, &flags);
1718
1719 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
1720 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
1721 if (is_menu)
1722 WARN_ON(step);
1723 else
1724 WARN_ON(cfg->menu_skip_mask);
1725 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
1726 qmenu = v4l2_ctrl_get_menu(cfg->id);
1727 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
1728 qmenu_int == NULL) {
1729 handler_set_err(hdl, -EINVAL);
1730 return NULL;
1731 }
1732
1733 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1734 type, min, max,
1735 is_menu ? cfg->menu_skip_mask : step,
1736 def, flags, qmenu, qmenu_int, priv);
1737 if (ctrl)
1738 ctrl->is_private = cfg->is_private;
1739 return ctrl;
1740 }
1741 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1742
1743 /* Helper function for standard non-menu controls */
1744 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1745 const struct v4l2_ctrl_ops *ops,
1746 u32 id, s32 min, s32 max, u32 step, s32 def)
1747 {
1748 const char *name;
1749 enum v4l2_ctrl_type type;
1750 u32 flags;
1751
1752 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1753 if (type == V4L2_CTRL_TYPE_MENU
1754 || type == V4L2_CTRL_TYPE_INTEGER_MENU) {
1755 handler_set_err(hdl, -EINVAL);
1756 return NULL;
1757 }
1758 return v4l2_ctrl_new(hdl, ops, id, name, type,
1759 min, max, step, def, flags, NULL, NULL, NULL);
1760 }
1761 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1762
1763 /* Helper function for standard menu controls */
1764 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1765 const struct v4l2_ctrl_ops *ops,
1766 u32 id, s32 max, s32 mask, s32 def)
1767 {
1768 const char * const *qmenu = NULL;
1769 const s64 *qmenu_int = NULL;
1770 unsigned int qmenu_int_len = 0;
1771 const char *name;
1772 enum v4l2_ctrl_type type;
1773 s32 min;
1774 s32 step;
1775 u32 flags;
1776
1777 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1778
1779 if (type == V4L2_CTRL_TYPE_MENU)
1780 qmenu = v4l2_ctrl_get_menu(id);
1781 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1782 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
1783
1784 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
1785 handler_set_err(hdl, -EINVAL);
1786 return NULL;
1787 }
1788 return v4l2_ctrl_new(hdl, ops, id, name, type,
1789 0, max, mask, def, flags, qmenu, qmenu_int, NULL);
1790 }
1791 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1792
1793 /* Helper function for standard menu controls with driver defined menu */
1794 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
1795 const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
1796 s32 mask, s32 def, const char * const *qmenu)
1797 {
1798 enum v4l2_ctrl_type type;
1799 const char *name;
1800 u32 flags;
1801 s32 step;
1802 s32 min;
1803
1804 /* v4l2_ctrl_new_std_menu_items() should only be called for
1805 * standard controls without a standard menu.
1806 */
1807 if (v4l2_ctrl_get_menu(id)) {
1808 handler_set_err(hdl, -EINVAL);
1809 return NULL;
1810 }
1811
1812 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1813 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
1814 handler_set_err(hdl, -EINVAL);
1815 return NULL;
1816 }
1817 return v4l2_ctrl_new(hdl, ops, id, name, type, 0, max, mask, def,
1818 flags, qmenu, NULL, NULL);
1819
1820 }
1821 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
1822
1823 /* Helper function for standard integer menu controls */
1824 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
1825 const struct v4l2_ctrl_ops *ops,
1826 u32 id, s32 max, s32 def, const s64 *qmenu_int)
1827 {
1828 const char *name;
1829 enum v4l2_ctrl_type type;
1830 s32 min;
1831 s32 step;
1832 u32 flags;
1833
1834 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1835 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
1836 handler_set_err(hdl, -EINVAL);
1837 return NULL;
1838 }
1839 return v4l2_ctrl_new(hdl, ops, id, name, type,
1840 0, max, 0, def, flags, NULL, qmenu_int, NULL);
1841 }
1842 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
1843
1844 /* Add a control from another handler to this handler */
1845 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1846 struct v4l2_ctrl *ctrl)
1847 {
1848 if (hdl == NULL || hdl->error)
1849 return NULL;
1850 if (ctrl == NULL) {
1851 handler_set_err(hdl, -EINVAL);
1852 return NULL;
1853 }
1854 if (ctrl->handler == hdl)
1855 return ctrl;
1856 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1857 }
1858 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1859
1860 /* Add the controls from another handler to our own. */
1861 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1862 struct v4l2_ctrl_handler *add,
1863 bool (*filter)(const struct v4l2_ctrl *ctrl))
1864 {
1865 struct v4l2_ctrl_ref *ref;
1866 int ret = 0;
1867
1868 /* Do nothing if either handler is NULL or if they are the same */
1869 if (!hdl || !add || hdl == add)
1870 return 0;
1871 if (hdl->error)
1872 return hdl->error;
1873 mutex_lock(add->lock);
1874 list_for_each_entry(ref, &add->ctrl_refs, node) {
1875 struct v4l2_ctrl *ctrl = ref->ctrl;
1876
1877 /* Skip handler-private controls. */
1878 if (ctrl->is_private)
1879 continue;
1880 /* And control classes */
1881 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1882 continue;
1883 /* Filter any unwanted controls */
1884 if (filter && !filter(ctrl))
1885 continue;
1886 ret = handler_new_ref(hdl, ctrl);
1887 if (ret)
1888 break;
1889 }
1890 mutex_unlock(add->lock);
1891 return ret;
1892 }
1893 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1894
1895 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
1896 {
1897 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
1898 return true;
1899 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
1900 return true;
1901 switch (ctrl->id) {
1902 case V4L2_CID_AUDIO_MUTE:
1903 case V4L2_CID_AUDIO_VOLUME:
1904 case V4L2_CID_AUDIO_BALANCE:
1905 case V4L2_CID_AUDIO_BASS:
1906 case V4L2_CID_AUDIO_TREBLE:
1907 case V4L2_CID_AUDIO_LOUDNESS:
1908 return true;
1909 default:
1910 break;
1911 }
1912 return false;
1913 }
1914 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
1915
1916 /* Cluster controls */
1917 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1918 {
1919 bool has_volatiles = false;
1920 int i;
1921
1922 /* The first control is the master control and it must not be NULL */
1923 BUG_ON(ncontrols == 0 || controls[0] == NULL);
1924
1925 for (i = 0; i < ncontrols; i++) {
1926 if (controls[i]) {
1927 controls[i]->cluster = controls;
1928 controls[i]->ncontrols = ncontrols;
1929 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1930 has_volatiles = true;
1931 }
1932 }
1933 controls[0]->has_volatiles = has_volatiles;
1934 }
1935 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1936
1937 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1938 u8 manual_val, bool set_volatile)
1939 {
1940 struct v4l2_ctrl *master = controls[0];
1941 u32 flag = 0;
1942 int i;
1943
1944 v4l2_ctrl_cluster(ncontrols, controls);
1945 WARN_ON(ncontrols <= 1);
1946 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1947 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1948 master->is_auto = true;
1949 master->has_volatiles = set_volatile;
1950 master->manual_mode_value = manual_val;
1951 master->flags |= V4L2_CTRL_FLAG_UPDATE;
1952
1953 if (!is_cur_manual(master))
1954 flag = V4L2_CTRL_FLAG_INACTIVE |
1955 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1956
1957 for (i = 1; i < ncontrols; i++)
1958 if (controls[i])
1959 controls[i]->flags |= flag;
1960 }
1961 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1962
1963 /* Activate/deactivate a control. */
1964 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1965 {
1966 /* invert since the actual flag is called 'inactive' */
1967 bool inactive = !active;
1968 bool old;
1969
1970 if (ctrl == NULL)
1971 return;
1972
1973 if (inactive)
1974 /* set V4L2_CTRL_FLAG_INACTIVE */
1975 old = test_and_set_bit(4, &ctrl->flags);
1976 else
1977 /* clear V4L2_CTRL_FLAG_INACTIVE */
1978 old = test_and_clear_bit(4, &ctrl->flags);
1979 if (old != inactive)
1980 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1981 }
1982 EXPORT_SYMBOL(v4l2_ctrl_activate);
1983
1984 /* Grab/ungrab a control.
1985 Typically used when streaming starts and you want to grab controls,
1986 preventing the user from changing them.
1987
1988 Just call this and the framework will block any attempts to change
1989 these controls. */
1990 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1991 {
1992 bool old;
1993
1994 if (ctrl == NULL)
1995 return;
1996
1997 v4l2_ctrl_lock(ctrl);
1998 if (grabbed)
1999 /* set V4L2_CTRL_FLAG_GRABBED */
2000 old = test_and_set_bit(1, &ctrl->flags);
2001 else
2002 /* clear V4L2_CTRL_FLAG_GRABBED */
2003 old = test_and_clear_bit(1, &ctrl->flags);
2004 if (old != grabbed)
2005 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2006 v4l2_ctrl_unlock(ctrl);
2007 }
2008 EXPORT_SYMBOL(v4l2_ctrl_grab);
2009
2010 /* Log the control name and value */
2011 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2012 const char *prefix, const char *colon)
2013 {
2014 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2015 return;
2016 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2017 return;
2018
2019 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
2020
2021 switch (ctrl->type) {
2022 case V4L2_CTRL_TYPE_INTEGER:
2023 printk(KERN_CONT "%d", ctrl->cur.val);
2024 break;
2025 case V4L2_CTRL_TYPE_BOOLEAN:
2026 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
2027 break;
2028 case V4L2_CTRL_TYPE_MENU:
2029 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
2030 break;
2031 case V4L2_CTRL_TYPE_INTEGER_MENU:
2032 printk(KERN_CONT "%lld", ctrl->qmenu_int[ctrl->cur.val]);
2033 break;
2034 case V4L2_CTRL_TYPE_BITMASK:
2035 printk(KERN_CONT "0x%08x", ctrl->cur.val);
2036 break;
2037 case V4L2_CTRL_TYPE_INTEGER64:
2038 printk(KERN_CONT "%lld", ctrl->cur.val64);
2039 break;
2040 case V4L2_CTRL_TYPE_STRING:
2041 printk(KERN_CONT "%s", ctrl->cur.string);
2042 break;
2043 default:
2044 printk(KERN_CONT "unknown type %d", ctrl->type);
2045 break;
2046 }
2047 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2048 V4L2_CTRL_FLAG_GRABBED |
2049 V4L2_CTRL_FLAG_VOLATILE)) {
2050 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2051 printk(KERN_CONT " inactive");
2052 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2053 printk(KERN_CONT " grabbed");
2054 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2055 printk(KERN_CONT " volatile");
2056 }
2057 printk(KERN_CONT "\n");
2058 }
2059
2060 /* Log all controls owned by the handler */
2061 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2062 const char *prefix)
2063 {
2064 struct v4l2_ctrl *ctrl;
2065 const char *colon = "";
2066 int len;
2067
2068 if (hdl == NULL)
2069 return;
2070 if (prefix == NULL)
2071 prefix = "";
2072 len = strlen(prefix);
2073 if (len && prefix[len - 1] != ' ')
2074 colon = ": ";
2075 mutex_lock(hdl->lock);
2076 list_for_each_entry(ctrl, &hdl->ctrls, node)
2077 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2078 log_ctrl(ctrl, prefix, colon);
2079 mutex_unlock(hdl->lock);
2080 }
2081 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2082
2083 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2084 {
2085 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2086 return 0;
2087 }
2088 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2089
2090 /* Call s_ctrl for all controls owned by the handler */
2091 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2092 {
2093 struct v4l2_ctrl *ctrl;
2094 int ret = 0;
2095
2096 if (hdl == NULL)
2097 return 0;
2098 mutex_lock(hdl->lock);
2099 list_for_each_entry(ctrl, &hdl->ctrls, node)
2100 ctrl->done = false;
2101
2102 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2103 struct v4l2_ctrl *master = ctrl->cluster[0];
2104 int i;
2105
2106 /* Skip if this control was already handled by a cluster. */
2107 /* Skip button controls and read-only controls. */
2108 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2109 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2110 continue;
2111
2112 for (i = 0; i < master->ncontrols; i++) {
2113 if (master->cluster[i]) {
2114 cur_to_new(master->cluster[i]);
2115 master->cluster[i]->is_new = 1;
2116 master->cluster[i]->done = true;
2117 }
2118 }
2119 ret = call_op(master, s_ctrl);
2120 if (ret)
2121 break;
2122 }
2123 mutex_unlock(hdl->lock);
2124 return ret;
2125 }
2126 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2127
2128 /* Implement VIDIOC_QUERYCTRL */
2129 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2130 {
2131 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2132 struct v4l2_ctrl_ref *ref;
2133 struct v4l2_ctrl *ctrl;
2134
2135 if (hdl == NULL)
2136 return -EINVAL;
2137
2138 mutex_lock(hdl->lock);
2139
2140 /* Try to find it */
2141 ref = find_ref(hdl, id);
2142
2143 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
2144 /* Find the next control with ID > qc->id */
2145
2146 /* Did we reach the end of the control list? */
2147 if (id >= node2id(hdl->ctrl_refs.prev)) {
2148 ref = NULL; /* Yes, so there is no next control */
2149 } else if (ref) {
2150 /* We found a control with the given ID, so just get
2151 the next one in the list. */
2152 ref = list_entry(ref->node.next, typeof(*ref), node);
2153 } else {
2154 /* No control with the given ID exists, so start
2155 searching for the next largest ID. We know there
2156 is one, otherwise the first 'if' above would have
2157 been true. */
2158 list_for_each_entry(ref, &hdl->ctrl_refs, node)
2159 if (id < ref->ctrl->id)
2160 break;
2161 }
2162 }
2163 mutex_unlock(hdl->lock);
2164 if (!ref)
2165 return -EINVAL;
2166
2167 ctrl = ref->ctrl;
2168 memset(qc, 0, sizeof(*qc));
2169 if (id >= V4L2_CID_PRIVATE_BASE)
2170 qc->id = id;
2171 else
2172 qc->id = ctrl->id;
2173 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2174 qc->minimum = ctrl->minimum;
2175 qc->maximum = ctrl->maximum;
2176 qc->default_value = ctrl->default_value;
2177 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2178 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2179 qc->step = 1;
2180 else
2181 qc->step = ctrl->step;
2182 qc->flags = ctrl->flags;
2183 qc->type = ctrl->type;
2184 return 0;
2185 }
2186 EXPORT_SYMBOL(v4l2_queryctrl);
2187
2188 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2189 {
2190 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
2191 return -EINVAL;
2192 return v4l2_queryctrl(sd->ctrl_handler, qc);
2193 }
2194 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2195
2196 /* Implement VIDIOC_QUERYMENU */
2197 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2198 {
2199 struct v4l2_ctrl *ctrl;
2200 u32 i = qm->index;
2201
2202 ctrl = v4l2_ctrl_find(hdl, qm->id);
2203 if (!ctrl)
2204 return -EINVAL;
2205
2206 qm->reserved = 0;
2207 /* Sanity checks */
2208 switch (ctrl->type) {
2209 case V4L2_CTRL_TYPE_MENU:
2210 if (ctrl->qmenu == NULL)
2211 return -EINVAL;
2212 break;
2213 case V4L2_CTRL_TYPE_INTEGER_MENU:
2214 if (ctrl->qmenu_int == NULL)
2215 return -EINVAL;
2216 break;
2217 default:
2218 return -EINVAL;
2219 }
2220
2221 if (i < ctrl->minimum || i > ctrl->maximum)
2222 return -EINVAL;
2223
2224 /* Use mask to see if this menu item should be skipped */
2225 if (ctrl->menu_skip_mask & (1 << i))
2226 return -EINVAL;
2227 /* Empty menu items should also be skipped */
2228 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2229 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2230 return -EINVAL;
2231 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2232 } else {
2233 qm->value = ctrl->qmenu_int[i];
2234 }
2235 return 0;
2236 }
2237 EXPORT_SYMBOL(v4l2_querymenu);
2238
2239 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2240 {
2241 return v4l2_querymenu(sd->ctrl_handler, qm);
2242 }
2243 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2244
2245
2246
2247 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2248
2249 It is not a fully atomic operation, just best-effort only. After all, if
2250 multiple controls have to be set through multiple i2c writes (for example)
2251 then some initial writes may succeed while others fail. Thus leaving the
2252 system in an inconsistent state. The question is how much effort you are
2253 willing to spend on trying to make something atomic that really isn't.
2254
2255 From the point of view of an application the main requirement is that
2256 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2257 error should be returned without actually affecting any controls.
2258
2259 If all the values are correct, then it is acceptable to just give up
2260 in case of low-level errors.
2261
2262 It is important though that the application can tell when only a partial
2263 configuration was done. The way we do that is through the error_idx field
2264 of struct v4l2_ext_controls: if that is equal to the count field then no
2265 controls were affected. Otherwise all controls before that index were
2266 successful in performing their 'get' or 'set' operation, the control at
2267 the given index failed, and you don't know what happened with the controls
2268 after the failed one. Since if they were part of a control cluster they
2269 could have been successfully processed (if a cluster member was encountered
2270 at index < error_idx), they could have failed (if a cluster member was at
2271 error_idx), or they may not have been processed yet (if the first cluster
2272 member appeared after error_idx).
2273
2274 It is all fairly theoretical, though. In practice all you can do is to
2275 bail out. If error_idx == count, then it is an application bug. If
2276 error_idx < count then it is only an application bug if the error code was
2277 EBUSY. That usually means that something started streaming just when you
2278 tried to set the controls. In all other cases it is a driver/hardware
2279 problem and all you can do is to retry or bail out.
2280
2281 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2282 never modifies controls the error_idx is just set to whatever control
2283 has an invalid value.
2284 */
2285
2286 /* Prepare for the extended g/s/try functions.
2287 Find the controls in the control array and do some basic checks. */
2288 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2289 struct v4l2_ext_controls *cs,
2290 struct v4l2_ctrl_helper *helpers)
2291 {
2292 struct v4l2_ctrl_helper *h;
2293 bool have_clusters = false;
2294 u32 i;
2295
2296 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2297 struct v4l2_ext_control *c = &cs->controls[i];
2298 struct v4l2_ctrl_ref *ref;
2299 struct v4l2_ctrl *ctrl;
2300 u32 id = c->id & V4L2_CTRL_ID_MASK;
2301
2302 cs->error_idx = i;
2303
2304 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2305 return -EINVAL;
2306
2307 /* Old-style private controls are not allowed for
2308 extended controls */
2309 if (id >= V4L2_CID_PRIVATE_BASE)
2310 return -EINVAL;
2311 ref = find_ref_lock(hdl, id);
2312 if (ref == NULL)
2313 return -EINVAL;
2314 ctrl = ref->ctrl;
2315 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2316 return -EINVAL;
2317
2318 if (ctrl->cluster[0]->ncontrols > 1)
2319 have_clusters = true;
2320 if (ctrl->cluster[0] != ctrl)
2321 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2322 /* Store the ref to the master control of the cluster */
2323 h->mref = ref;
2324 h->ctrl = ctrl;
2325 /* Initially set next to 0, meaning that there is no other
2326 control in this helper array belonging to the same
2327 cluster */
2328 h->next = 0;
2329 }
2330
2331 /* We are done if there were no controls that belong to a multi-
2332 control cluster. */
2333 if (!have_clusters)
2334 return 0;
2335
2336 /* The code below figures out in O(n) time which controls in the list
2337 belong to the same cluster. */
2338
2339 /* This has to be done with the handler lock taken. */
2340 mutex_lock(hdl->lock);
2341
2342 /* First zero the helper field in the master control references */
2343 for (i = 0; i < cs->count; i++)
2344 helpers[i].mref->helper = NULL;
2345 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2346 struct v4l2_ctrl_ref *mref = h->mref;
2347
2348 /* If the mref->helper is set, then it points to an earlier
2349 helper that belongs to the same cluster. */
2350 if (mref->helper) {
2351 /* Set the next field of mref->helper to the current
2352 index: this means that that earlier helper now
2353 points to the next helper in the same cluster. */
2354 mref->helper->next = i;
2355 /* mref should be set only for the first helper in the
2356 cluster, clear the others. */
2357 h->mref = NULL;
2358 }
2359 /* Point the mref helper to the current helper struct. */
2360 mref->helper = h;
2361 }
2362 mutex_unlock(hdl->lock);
2363 return 0;
2364 }
2365
2366 /* Handles the corner case where cs->count == 0. It checks whether the
2367 specified control class exists. If that class ID is 0, then it checks
2368 whether there are any controls at all. */
2369 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2370 {
2371 if (ctrl_class == 0)
2372 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2373 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2374 }
2375
2376
2377
2378 /* Get extended controls. Allocates the helpers array if needed. */
2379 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2380 {
2381 struct v4l2_ctrl_helper helper[4];
2382 struct v4l2_ctrl_helper *helpers = helper;
2383 int ret;
2384 int i, j;
2385
2386 cs->error_idx = cs->count;
2387 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2388
2389 if (hdl == NULL)
2390 return -EINVAL;
2391
2392 if (cs->count == 0)
2393 return class_check(hdl, cs->ctrl_class);
2394
2395 if (cs->count > ARRAY_SIZE(helper)) {
2396 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2397 GFP_KERNEL);
2398 if (helpers == NULL)
2399 return -ENOMEM;
2400 }
2401
2402 ret = prepare_ext_ctrls(hdl, cs, helpers);
2403 cs->error_idx = cs->count;
2404
2405 for (i = 0; !ret && i < cs->count; i++)
2406 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2407 ret = -EACCES;
2408
2409 for (i = 0; !ret && i < cs->count; i++) {
2410 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2411 struct v4l2_ctrl *ctrl) = cur_to_user;
2412 struct v4l2_ctrl *master;
2413
2414 if (helpers[i].mref == NULL)
2415 continue;
2416
2417 master = helpers[i].mref->ctrl;
2418 cs->error_idx = i;
2419
2420 v4l2_ctrl_lock(master);
2421
2422 /* g_volatile_ctrl will update the new control values */
2423 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2424 (master->has_volatiles && !is_cur_manual(master))) {
2425 for (j = 0; j < master->ncontrols; j++)
2426 cur_to_new(master->cluster[j]);
2427 ret = call_op(master, g_volatile_ctrl);
2428 ctrl_to_user = new_to_user;
2429 }
2430 /* If OK, then copy the current (for non-volatile controls)
2431 or the new (for volatile controls) control values to the
2432 caller */
2433 if (!ret) {
2434 u32 idx = i;
2435
2436 do {
2437 ret = ctrl_to_user(cs->controls + idx,
2438 helpers[idx].ctrl);
2439 idx = helpers[idx].next;
2440 } while (!ret && idx);
2441 }
2442 v4l2_ctrl_unlock(master);
2443 }
2444
2445 if (cs->count > ARRAY_SIZE(helper))
2446 kfree(helpers);
2447 return ret;
2448 }
2449 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2450
2451 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2452 {
2453 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2454 }
2455 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2456
2457 /* Helper function to get a single control */
2458 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2459 {
2460 struct v4l2_ctrl *master = ctrl->cluster[0];
2461 int ret = 0;
2462 int i;
2463
2464 /* String controls are not supported. The new_to_user() and
2465 * cur_to_user() calls below would need to be modified not to access
2466 * userspace memory when called from get_ctrl().
2467 */
2468 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2469 return -EINVAL;
2470
2471 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2472 return -EACCES;
2473
2474 v4l2_ctrl_lock(master);
2475 /* g_volatile_ctrl will update the current control values */
2476 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2477 for (i = 0; i < master->ncontrols; i++)
2478 cur_to_new(master->cluster[i]);
2479 ret = call_op(master, g_volatile_ctrl);
2480 new_to_user(c, ctrl);
2481 } else {
2482 cur_to_user(c, ctrl);
2483 }
2484 v4l2_ctrl_unlock(master);
2485 return ret;
2486 }
2487
2488 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2489 {
2490 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2491 struct v4l2_ext_control c;
2492 int ret;
2493
2494 if (ctrl == NULL || !type_is_int(ctrl))
2495 return -EINVAL;
2496 ret = get_ctrl(ctrl, &c);
2497 control->value = c.value;
2498 return ret;
2499 }
2500 EXPORT_SYMBOL(v4l2_g_ctrl);
2501
2502 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2503 {
2504 return v4l2_g_ctrl(sd->ctrl_handler, control);
2505 }
2506 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2507
2508 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2509 {
2510 struct v4l2_ext_control c;
2511
2512 /* It's a driver bug if this happens. */
2513 WARN_ON(!type_is_int(ctrl));
2514 c.value = 0;
2515 get_ctrl(ctrl, &c);
2516 return c.value;
2517 }
2518 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2519
2520 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2521 {
2522 struct v4l2_ext_control c;
2523
2524 /* It's a driver bug if this happens. */
2525 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2526 c.value = 0;
2527 get_ctrl(ctrl, &c);
2528 return c.value;
2529 }
2530 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2531
2532
2533 /* Core function that calls try/s_ctrl and ensures that the new value is
2534 copied to the current value on a set.
2535 Must be called with ctrl->handler->lock held. */
2536 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2537 bool set, u32 ch_flags)
2538 {
2539 bool update_flag;
2540 int ret;
2541 int i;
2542
2543 /* Go through the cluster and either validate the new value or
2544 (if no new value was set), copy the current value to the new
2545 value, ensuring a consistent view for the control ops when
2546 called. */
2547 for (i = 0; i < master->ncontrols; i++) {
2548 struct v4l2_ctrl *ctrl = master->cluster[i];
2549
2550 if (ctrl == NULL)
2551 continue;
2552
2553 if (!ctrl->is_new) {
2554 cur_to_new(ctrl);
2555 continue;
2556 }
2557 /* Check again: it may have changed since the
2558 previous check in try_or_set_ext_ctrls(). */
2559 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2560 return -EBUSY;
2561 }
2562
2563 ret = call_op(master, try_ctrl);
2564
2565 /* Don't set if there is no change */
2566 if (ret || !set || !cluster_changed(master))
2567 return ret;
2568 ret = call_op(master, s_ctrl);
2569 if (ret)
2570 return ret;
2571
2572 /* If OK, then make the new values permanent. */
2573 update_flag = is_cur_manual(master) != is_new_manual(master);
2574 for (i = 0; i < master->ncontrols; i++)
2575 new_to_cur(fh, master->cluster[i], ch_flags |
2576 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2577 return 0;
2578 }
2579
2580 /* Validate controls. */
2581 static int validate_ctrls(struct v4l2_ext_controls *cs,
2582 struct v4l2_ctrl_helper *helpers, bool set)
2583 {
2584 unsigned i;
2585 int ret = 0;
2586
2587 cs->error_idx = cs->count;
2588 for (i = 0; i < cs->count; i++) {
2589 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2590
2591 cs->error_idx = i;
2592
2593 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2594 return -EACCES;
2595 /* This test is also done in try_set_control_cluster() which
2596 is called in atomic context, so that has the final say,
2597 but it makes sense to do an up-front check as well. Once
2598 an error occurs in try_set_control_cluster() some other
2599 controls may have been set already and we want to do a
2600 best-effort to avoid that. */
2601 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2602 return -EBUSY;
2603 ret = validate_new(ctrl, &cs->controls[i]);
2604 if (ret)
2605 return ret;
2606 }
2607 return 0;
2608 }
2609
2610 /* Obtain the current volatile values of an autocluster and mark them
2611 as new. */
2612 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2613 {
2614 int i;
2615
2616 for (i = 0; i < master->ncontrols; i++)
2617 cur_to_new(master->cluster[i]);
2618 if (!call_op(master, g_volatile_ctrl))
2619 for (i = 1; i < master->ncontrols; i++)
2620 if (master->cluster[i])
2621 master->cluster[i]->is_new = 1;
2622 }
2623
2624 /* Try or try-and-set controls */
2625 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2626 struct v4l2_ext_controls *cs,
2627 bool set)
2628 {
2629 struct v4l2_ctrl_helper helper[4];
2630 struct v4l2_ctrl_helper *helpers = helper;
2631 unsigned i, j;
2632 int ret;
2633
2634 cs->error_idx = cs->count;
2635 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2636
2637 if (hdl == NULL)
2638 return -EINVAL;
2639
2640 if (cs->count == 0)
2641 return class_check(hdl, cs->ctrl_class);
2642
2643 if (cs->count > ARRAY_SIZE(helper)) {
2644 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2645 GFP_KERNEL);
2646 if (!helpers)
2647 return -ENOMEM;
2648 }
2649 ret = prepare_ext_ctrls(hdl, cs, helpers);
2650 if (!ret)
2651 ret = validate_ctrls(cs, helpers, set);
2652 if (ret && set)
2653 cs->error_idx = cs->count;
2654 for (i = 0; !ret && i < cs->count; i++) {
2655 struct v4l2_ctrl *master;
2656 u32 idx = i;
2657
2658 if (helpers[i].mref == NULL)
2659 continue;
2660
2661 cs->error_idx = i;
2662 master = helpers[i].mref->ctrl;
2663 v4l2_ctrl_lock(master);
2664
2665 /* Reset the 'is_new' flags of the cluster */
2666 for (j = 0; j < master->ncontrols; j++)
2667 if (master->cluster[j])
2668 master->cluster[j]->is_new = 0;
2669
2670 /* For volatile autoclusters that are currently in auto mode
2671 we need to discover if it will be set to manual mode.
2672 If so, then we have to copy the current volatile values
2673 first since those will become the new manual values (which
2674 may be overwritten by explicit new values from this set
2675 of controls). */
2676 if (master->is_auto && master->has_volatiles &&
2677 !is_cur_manual(master)) {
2678 /* Pick an initial non-manual value */
2679 s32 new_auto_val = master->manual_mode_value + 1;
2680 u32 tmp_idx = idx;
2681
2682 do {
2683 /* Check if the auto control is part of the
2684 list, and remember the new value. */
2685 if (helpers[tmp_idx].ctrl == master)
2686 new_auto_val = cs->controls[tmp_idx].value;
2687 tmp_idx = helpers[tmp_idx].next;
2688 } while (tmp_idx);
2689 /* If the new value == the manual value, then copy
2690 the current volatile values. */
2691 if (new_auto_val == master->manual_mode_value)
2692 update_from_auto_cluster(master);
2693 }
2694
2695 /* Copy the new caller-supplied control values.
2696 user_to_new() sets 'is_new' to 1. */
2697 do {
2698 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2699 idx = helpers[idx].next;
2700 } while (!ret && idx);
2701
2702 if (!ret)
2703 ret = try_or_set_cluster(fh, master, set, 0);
2704
2705 /* Copy the new values back to userspace. */
2706 if (!ret) {
2707 idx = i;
2708 do {
2709 ret = new_to_user(cs->controls + idx,
2710 helpers[idx].ctrl);
2711 idx = helpers[idx].next;
2712 } while (!ret && idx);
2713 }
2714 v4l2_ctrl_unlock(master);
2715 }
2716
2717 if (cs->count > ARRAY_SIZE(helper))
2718 kfree(helpers);
2719 return ret;
2720 }
2721
2722 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2723 {
2724 return try_set_ext_ctrls(NULL, hdl, cs, false);
2725 }
2726 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2727
2728 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2729 struct v4l2_ext_controls *cs)
2730 {
2731 return try_set_ext_ctrls(fh, hdl, cs, true);
2732 }
2733 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2734
2735 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2736 {
2737 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2738 }
2739 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2740
2741 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2742 {
2743 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2744 }
2745 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2746
2747 /* Helper function for VIDIOC_S_CTRL compatibility */
2748 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2749 struct v4l2_ext_control *c, u32 ch_flags)
2750 {
2751 struct v4l2_ctrl *master = ctrl->cluster[0];
2752 int i;
2753
2754 /* String controls are not supported. The user_to_new() and
2755 * cur_to_user() calls below would need to be modified not to access
2756 * userspace memory when called from set_ctrl().
2757 */
2758 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2759 return -EINVAL;
2760
2761 /* Reset the 'is_new' flags of the cluster */
2762 for (i = 0; i < master->ncontrols; i++)
2763 if (master->cluster[i])
2764 master->cluster[i]->is_new = 0;
2765
2766 /* For autoclusters with volatiles that are switched from auto to
2767 manual mode we have to update the current volatile values since
2768 those will become the initial manual values after such a switch. */
2769 if (master->is_auto && master->has_volatiles && ctrl == master &&
2770 !is_cur_manual(master) && c->value == master->manual_mode_value)
2771 update_from_auto_cluster(master);
2772
2773 user_to_new(c, ctrl);
2774 return try_or_set_cluster(fh, master, true, ch_flags);
2775 }
2776
2777 /* Helper function for VIDIOC_S_CTRL compatibility */
2778 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2779 struct v4l2_ext_control *c)
2780 {
2781 int ret = validate_new(ctrl, c);
2782
2783 if (!ret) {
2784 v4l2_ctrl_lock(ctrl);
2785 ret = set_ctrl(fh, ctrl, c, 0);
2786 if (!ret)
2787 cur_to_user(c, ctrl);
2788 v4l2_ctrl_unlock(ctrl);
2789 }
2790 return ret;
2791 }
2792
2793 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2794 struct v4l2_control *control)
2795 {
2796 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2797 struct v4l2_ext_control c;
2798 int ret;
2799
2800 if (ctrl == NULL || !type_is_int(ctrl))
2801 return -EINVAL;
2802
2803 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2804 return -EACCES;
2805
2806 c.value = control->value;
2807 ret = set_ctrl_lock(fh, ctrl, &c);
2808 control->value = c.value;
2809 return ret;
2810 }
2811 EXPORT_SYMBOL(v4l2_s_ctrl);
2812
2813 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2814 {
2815 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2816 }
2817 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2818
2819 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2820 {
2821 struct v4l2_ext_control c;
2822
2823 /* It's a driver bug if this happens. */
2824 WARN_ON(!type_is_int(ctrl));
2825 c.value = val;
2826 return set_ctrl_lock(NULL, ctrl, &c);
2827 }
2828 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2829
2830 int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
2831 {
2832 struct v4l2_ext_control c;
2833
2834 /* It's a driver bug if this happens. */
2835 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2836 c.value64 = val;
2837 return set_ctrl_lock(NULL, ctrl, &c);
2838 }
2839 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
2840
2841 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
2842 {
2843 if (ctrl == NULL)
2844 return;
2845 if (notify == NULL) {
2846 ctrl->call_notify = 0;
2847 return;
2848 }
2849 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
2850 return;
2851 ctrl->handler->notify = notify;
2852 ctrl->handler->notify_priv = priv;
2853 ctrl->call_notify = 1;
2854 }
2855 EXPORT_SYMBOL(v4l2_ctrl_notify);
2856
2857 int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
2858 s32 min, s32 max, u32 step, s32 def)
2859 {
2860 int ret = check_range(ctrl->type, min, max, step, def);
2861 struct v4l2_ext_control c;
2862
2863 switch (ctrl->type) {
2864 case V4L2_CTRL_TYPE_INTEGER:
2865 case V4L2_CTRL_TYPE_BOOLEAN:
2866 case V4L2_CTRL_TYPE_MENU:
2867 case V4L2_CTRL_TYPE_INTEGER_MENU:
2868 case V4L2_CTRL_TYPE_BITMASK:
2869 if (ret)
2870 return ret;
2871 break;
2872 default:
2873 return -EINVAL;
2874 }
2875 v4l2_ctrl_lock(ctrl);
2876 ctrl->minimum = min;
2877 ctrl->maximum = max;
2878 ctrl->step = step;
2879 ctrl->default_value = def;
2880 c.value = ctrl->cur.val;
2881 if (validate_new(ctrl, &c))
2882 c.value = def;
2883 if (c.value != ctrl->cur.val)
2884 ret = set_ctrl(NULL, ctrl, &c, V4L2_EVENT_CTRL_CH_RANGE);
2885 else
2886 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
2887 v4l2_ctrl_unlock(ctrl);
2888 return ret;
2889 }
2890 EXPORT_SYMBOL(v4l2_ctrl_modify_range);
2891
2892 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
2893 {
2894 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2895
2896 if (ctrl == NULL)
2897 return -EINVAL;
2898
2899 v4l2_ctrl_lock(ctrl);
2900 list_add_tail(&sev->node, &ctrl->ev_subs);
2901 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2902 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2903 struct v4l2_event ev;
2904 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2905
2906 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2907 changes |= V4L2_EVENT_CTRL_CH_VALUE;
2908 fill_event(&ev, ctrl, changes);
2909 /* Mark the queue as active, allowing this initial
2910 event to be accepted. */
2911 sev->elems = elems;
2912 v4l2_event_queue_fh(sev->fh, &ev);
2913 }
2914 v4l2_ctrl_unlock(ctrl);
2915 return 0;
2916 }
2917
2918 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
2919 {
2920 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2921
2922 v4l2_ctrl_lock(ctrl);
2923 list_del(&sev->node);
2924 v4l2_ctrl_unlock(ctrl);
2925 }
2926
2927 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
2928 {
2929 u32 old_changes = old->u.ctrl.changes;
2930
2931 old->u.ctrl = new->u.ctrl;
2932 old->u.ctrl.changes |= old_changes;
2933 }
2934 EXPORT_SYMBOL(v4l2_ctrl_replace);
2935
2936 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
2937 {
2938 new->u.ctrl.changes |= old->u.ctrl.changes;
2939 }
2940 EXPORT_SYMBOL(v4l2_ctrl_merge);
2941
2942 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
2943 .add = v4l2_ctrl_add_event,
2944 .del = v4l2_ctrl_del_event,
2945 .replace = v4l2_ctrl_replace,
2946 .merge = v4l2_ctrl_merge,
2947 };
2948 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
2949
2950 int v4l2_ctrl_log_status(struct file *file, void *fh)
2951 {
2952 struct video_device *vfd = video_devdata(file);
2953 struct v4l2_fh *vfh = file->private_data;
2954
2955 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
2956 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
2957 vfd->v4l2_dev->name);
2958 return 0;
2959 }
2960 EXPORT_SYMBOL(v4l2_ctrl_log_status);
2961
2962 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
2963 const struct v4l2_event_subscription *sub)
2964 {
2965 if (sub->type == V4L2_EVENT_CTRL)
2966 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
2967 return -EINVAL;
2968 }
2969 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
2970
2971 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
2972 struct v4l2_event_subscription *sub)
2973 {
2974 if (!sd->ctrl_handler)
2975 return -EINVAL;
2976 return v4l2_ctrl_subscribe_event(fh, sub);
2977 }
2978 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
2979
2980 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
2981 {
2982 struct v4l2_fh *fh = file->private_data;
2983
2984 if (v4l2_event_pending(fh))
2985 return POLLPRI;
2986 poll_wait(file, &fh->wait, wait);
2987 return 0;
2988 }
2989 EXPORT_SYMBOL(v4l2_ctrl_poll);
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