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[media] Fix 64-bit division fall-out from 64-bit control ranges
[deliverable/linux.git] / drivers / media / v4l2-core / v4l2-ctrls.c
1 /*
2 V4L2 controls framework implementation.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/ctype.h>
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-event.h>
28 #include <media/v4l2-dev.h>
29
30 #define has_op(master, op) \
31 (master->ops && master->ops->op)
32 #define call_op(master, op) \
33 (has_op(master, op) ? master->ops->op(master) : 0)
34
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl *ctrl;
41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
43 u32 next;
44 };
45
46 /* Small helper function to determine if the autocluster is set to manual
47 mode. */
48 static bool is_cur_manual(const struct v4l2_ctrl *master)
49 {
50 return master->is_auto && master->cur.val == master->manual_mode_value;
51 }
52
53 /* Same as above, but this checks the against the new value instead of the
54 current value. */
55 static bool is_new_manual(const struct v4l2_ctrl *master)
56 {
57 return master->is_auto && master->val == master->manual_mode_value;
58 }
59
60 /* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
64 const char * const *v4l2_ctrl_get_menu(u32 id)
65 {
66 static const char * const mpeg_audio_sampling_freq[] = {
67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
72 static const char * const mpeg_audio_encoding[] = {
73 "MPEG-1/2 Layer I",
74 "MPEG-1/2 Layer II",
75 "MPEG-1/2 Layer III",
76 "MPEG-2/4 AAC",
77 "AC-3",
78 NULL
79 };
80 static const char * const mpeg_audio_l1_bitrate[] = {
81 "32 kbps",
82 "64 kbps",
83 "96 kbps",
84 "128 kbps",
85 "160 kbps",
86 "192 kbps",
87 "224 kbps",
88 "256 kbps",
89 "288 kbps",
90 "320 kbps",
91 "352 kbps",
92 "384 kbps",
93 "416 kbps",
94 "448 kbps",
95 NULL
96 };
97 static const char * const mpeg_audio_l2_bitrate[] = {
98 "32 kbps",
99 "48 kbps",
100 "56 kbps",
101 "64 kbps",
102 "80 kbps",
103 "96 kbps",
104 "112 kbps",
105 "128 kbps",
106 "160 kbps",
107 "192 kbps",
108 "224 kbps",
109 "256 kbps",
110 "320 kbps",
111 "384 kbps",
112 NULL
113 };
114 static const char * const mpeg_audio_l3_bitrate[] = {
115 "32 kbps",
116 "40 kbps",
117 "48 kbps",
118 "56 kbps",
119 "64 kbps",
120 "80 kbps",
121 "96 kbps",
122 "112 kbps",
123 "128 kbps",
124 "160 kbps",
125 "192 kbps",
126 "224 kbps",
127 "256 kbps",
128 "320 kbps",
129 NULL
130 };
131 static const char * const mpeg_audio_ac3_bitrate[] = {
132 "32 kbps",
133 "40 kbps",
134 "48 kbps",
135 "56 kbps",
136 "64 kbps",
137 "80 kbps",
138 "96 kbps",
139 "112 kbps",
140 "128 kbps",
141 "160 kbps",
142 "192 kbps",
143 "224 kbps",
144 "256 kbps",
145 "320 kbps",
146 "384 kbps",
147 "448 kbps",
148 "512 kbps",
149 "576 kbps",
150 "640 kbps",
151 NULL
152 };
153 static const char * const mpeg_audio_mode[] = {
154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
160 static const char * const mpeg_audio_mode_extension[] = {
161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
167 static const char * const mpeg_audio_emphasis[] = {
168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
173 static const char * const mpeg_audio_crc[] = {
174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
178 static const char * const mpeg_audio_dec_playback[] = {
179 "Auto",
180 "Stereo",
181 "Left",
182 "Right",
183 "Mono",
184 "Swapped Stereo",
185 NULL
186 };
187 static const char * const mpeg_video_encoding[] = {
188 "MPEG-1",
189 "MPEG-2",
190 "MPEG-4 AVC",
191 NULL
192 };
193 static const char * const mpeg_video_aspect[] = {
194 "1x1",
195 "4x3",
196 "16x9",
197 "2.21x1",
198 NULL
199 };
200 static const char * const mpeg_video_bitrate_mode[] = {
201 "Variable Bitrate",
202 "Constant Bitrate",
203 NULL
204 };
205 static const char * const mpeg_stream_type[] = {
206 "MPEG-2 Program Stream",
207 "MPEG-2 Transport Stream",
208 "MPEG-1 System Stream",
209 "MPEG-2 DVD-compatible Stream",
210 "MPEG-1 VCD-compatible Stream",
211 "MPEG-2 SVCD-compatible Stream",
212 NULL
213 };
214 static const char * const mpeg_stream_vbi_fmt[] = {
215 "No VBI",
216 "Private Packet, IVTV Format",
217 NULL
218 };
219 static const char * const camera_power_line_frequency[] = {
220 "Disabled",
221 "50 Hz",
222 "60 Hz",
223 "Auto",
224 NULL
225 };
226 static const char * const camera_exposure_auto[] = {
227 "Auto Mode",
228 "Manual Mode",
229 "Shutter Priority Mode",
230 "Aperture Priority Mode",
231 NULL
232 };
233 static const char * const camera_exposure_metering[] = {
234 "Average",
235 "Center Weighted",
236 "Spot",
237 "Matrix",
238 NULL
239 };
240 static const char * const camera_auto_focus_range[] = {
241 "Auto",
242 "Normal",
243 "Macro",
244 "Infinity",
245 NULL
246 };
247 static const char * const colorfx[] = {
248 "None",
249 "Black & White",
250 "Sepia",
251 "Negative",
252 "Emboss",
253 "Sketch",
254 "Sky Blue",
255 "Grass Green",
256 "Skin Whiten",
257 "Vivid",
258 "Aqua",
259 "Art Freeze",
260 "Silhouette",
261 "Solarization",
262 "Antique",
263 "Set Cb/Cr",
264 NULL
265 };
266 static const char * const auto_n_preset_white_balance[] = {
267 "Manual",
268 "Auto",
269 "Incandescent",
270 "Fluorescent",
271 "Fluorescent H",
272 "Horizon",
273 "Daylight",
274 "Flash",
275 "Cloudy",
276 "Shade",
277 NULL,
278 };
279 static const char * const camera_iso_sensitivity_auto[] = {
280 "Manual",
281 "Auto",
282 NULL
283 };
284 static const char * const scene_mode[] = {
285 "None",
286 "Backlight",
287 "Beach/Snow",
288 "Candle Light",
289 "Dusk/Dawn",
290 "Fall Colors",
291 "Fireworks",
292 "Landscape",
293 "Night",
294 "Party/Indoor",
295 "Portrait",
296 "Sports",
297 "Sunset",
298 "Text",
299 NULL
300 };
301 static const char * const tune_emphasis[] = {
302 "None",
303 "50 Microseconds",
304 "75 Microseconds",
305 NULL,
306 };
307 static const char * const header_mode[] = {
308 "Separate Buffer",
309 "Joined With 1st Frame",
310 NULL,
311 };
312 static const char * const multi_slice[] = {
313 "Single",
314 "Max Macroblocks",
315 "Max Bytes",
316 NULL,
317 };
318 static const char * const entropy_mode[] = {
319 "CAVLC",
320 "CABAC",
321 NULL,
322 };
323 static const char * const mpeg_h264_level[] = {
324 "1",
325 "1b",
326 "1.1",
327 "1.2",
328 "1.3",
329 "2",
330 "2.1",
331 "2.2",
332 "3",
333 "3.1",
334 "3.2",
335 "4",
336 "4.1",
337 "4.2",
338 "5",
339 "5.1",
340 NULL,
341 };
342 static const char * const h264_loop_filter[] = {
343 "Enabled",
344 "Disabled",
345 "Disabled at Slice Boundary",
346 NULL,
347 };
348 static const char * const h264_profile[] = {
349 "Baseline",
350 "Constrained Baseline",
351 "Main",
352 "Extended",
353 "High",
354 "High 10",
355 "High 422",
356 "High 444 Predictive",
357 "High 10 Intra",
358 "High 422 Intra",
359 "High 444 Intra",
360 "CAVLC 444 Intra",
361 "Scalable Baseline",
362 "Scalable High",
363 "Scalable High Intra",
364 "Multiview High",
365 NULL,
366 };
367 static const char * const vui_sar_idc[] = {
368 "Unspecified",
369 "1:1",
370 "12:11",
371 "10:11",
372 "16:11",
373 "40:33",
374 "24:11",
375 "20:11",
376 "32:11",
377 "80:33",
378 "18:11",
379 "15:11",
380 "64:33",
381 "160:99",
382 "4:3",
383 "3:2",
384 "2:1",
385 "Extended SAR",
386 NULL,
387 };
388 static const char * const h264_fp_arrangement_type[] = {
389 "Checkerboard",
390 "Column",
391 "Row",
392 "Side by Side",
393 "Top Bottom",
394 "Temporal",
395 NULL,
396 };
397 static const char * const h264_fmo_map_type[] = {
398 "Interleaved Slices",
399 "Scattered Slices",
400 "Foreground with Leftover",
401 "Box Out",
402 "Raster Scan",
403 "Wipe Scan",
404 "Explicit",
405 NULL,
406 };
407 static const char * const mpeg_mpeg4_level[] = {
408 "0",
409 "0b",
410 "1",
411 "2",
412 "3",
413 "3b",
414 "4",
415 "5",
416 NULL,
417 };
418 static const char * const mpeg4_profile[] = {
419 "Simple",
420 "Advanced Simple",
421 "Core",
422 "Simple Scalable",
423 "Advanced Coding Efficiency",
424 NULL,
425 };
426
427 static const char * const vpx_golden_frame_sel[] = {
428 "Use Previous Frame",
429 "Use Previous Specific Frame",
430 NULL,
431 };
432
433 static const char * const flash_led_mode[] = {
434 "Off",
435 "Flash",
436 "Torch",
437 NULL,
438 };
439 static const char * const flash_strobe_source[] = {
440 "Software",
441 "External",
442 NULL,
443 };
444
445 static const char * const jpeg_chroma_subsampling[] = {
446 "4:4:4",
447 "4:2:2",
448 "4:2:0",
449 "4:1:1",
450 "4:1:0",
451 "Gray",
452 NULL,
453 };
454 static const char * const dv_tx_mode[] = {
455 "DVI-D",
456 "HDMI",
457 NULL,
458 };
459 static const char * const dv_rgb_range[] = {
460 "Automatic",
461 "RGB limited range (16-235)",
462 "RGB full range (0-255)",
463 NULL,
464 };
465 static const char * const detect_md_mode[] = {
466 "Disabled",
467 "Global",
468 "Threshold Grid",
469 "Region Grid",
470 NULL,
471 };
472
473
474 switch (id) {
475 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
476 return mpeg_audio_sampling_freq;
477 case V4L2_CID_MPEG_AUDIO_ENCODING:
478 return mpeg_audio_encoding;
479 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
480 return mpeg_audio_l1_bitrate;
481 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
482 return mpeg_audio_l2_bitrate;
483 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
484 return mpeg_audio_l3_bitrate;
485 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
486 return mpeg_audio_ac3_bitrate;
487 case V4L2_CID_MPEG_AUDIO_MODE:
488 return mpeg_audio_mode;
489 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
490 return mpeg_audio_mode_extension;
491 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
492 return mpeg_audio_emphasis;
493 case V4L2_CID_MPEG_AUDIO_CRC:
494 return mpeg_audio_crc;
495 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
496 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
497 return mpeg_audio_dec_playback;
498 case V4L2_CID_MPEG_VIDEO_ENCODING:
499 return mpeg_video_encoding;
500 case V4L2_CID_MPEG_VIDEO_ASPECT:
501 return mpeg_video_aspect;
502 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
503 return mpeg_video_bitrate_mode;
504 case V4L2_CID_MPEG_STREAM_TYPE:
505 return mpeg_stream_type;
506 case V4L2_CID_MPEG_STREAM_VBI_FMT:
507 return mpeg_stream_vbi_fmt;
508 case V4L2_CID_POWER_LINE_FREQUENCY:
509 return camera_power_line_frequency;
510 case V4L2_CID_EXPOSURE_AUTO:
511 return camera_exposure_auto;
512 case V4L2_CID_EXPOSURE_METERING:
513 return camera_exposure_metering;
514 case V4L2_CID_AUTO_FOCUS_RANGE:
515 return camera_auto_focus_range;
516 case V4L2_CID_COLORFX:
517 return colorfx;
518 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
519 return auto_n_preset_white_balance;
520 case V4L2_CID_ISO_SENSITIVITY_AUTO:
521 return camera_iso_sensitivity_auto;
522 case V4L2_CID_SCENE_MODE:
523 return scene_mode;
524 case V4L2_CID_TUNE_PREEMPHASIS:
525 return tune_emphasis;
526 case V4L2_CID_TUNE_DEEMPHASIS:
527 return tune_emphasis;
528 case V4L2_CID_FLASH_LED_MODE:
529 return flash_led_mode;
530 case V4L2_CID_FLASH_STROBE_SOURCE:
531 return flash_strobe_source;
532 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
533 return header_mode;
534 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
535 return multi_slice;
536 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
537 return entropy_mode;
538 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
539 return mpeg_h264_level;
540 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
541 return h264_loop_filter;
542 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
543 return h264_profile;
544 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
545 return vui_sar_idc;
546 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
547 return h264_fp_arrangement_type;
548 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
549 return h264_fmo_map_type;
550 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
551 return mpeg_mpeg4_level;
552 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
553 return mpeg4_profile;
554 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
555 return vpx_golden_frame_sel;
556 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
557 return jpeg_chroma_subsampling;
558 case V4L2_CID_DV_TX_MODE:
559 return dv_tx_mode;
560 case V4L2_CID_DV_TX_RGB_RANGE:
561 case V4L2_CID_DV_RX_RGB_RANGE:
562 return dv_rgb_range;
563 case V4L2_CID_DETECT_MD_MODE:
564 return detect_md_mode;
565
566 default:
567 return NULL;
568 }
569 }
570 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
571
572 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
573 /*
574 * Returns NULL or an s64 type array containing the menu for given
575 * control ID. The total number of the menu items is returned in @len.
576 */
577 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
578 {
579 static const s64 qmenu_int_vpx_num_partitions[] = {
580 1, 2, 4, 8,
581 };
582
583 static const s64 qmenu_int_vpx_num_ref_frames[] = {
584 1, 2, 3,
585 };
586
587 switch (id) {
588 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
589 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
590 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
591 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
592 default:
593 *len = 0;
594 return NULL;
595 }
596 }
597 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
598
599 /* Return the control name. */
600 const char *v4l2_ctrl_get_name(u32 id)
601 {
602 switch (id) {
603 /* USER controls */
604 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
605 case V4L2_CID_USER_CLASS: return "User Controls";
606 case V4L2_CID_BRIGHTNESS: return "Brightness";
607 case V4L2_CID_CONTRAST: return "Contrast";
608 case V4L2_CID_SATURATION: return "Saturation";
609 case V4L2_CID_HUE: return "Hue";
610 case V4L2_CID_AUDIO_VOLUME: return "Volume";
611 case V4L2_CID_AUDIO_BALANCE: return "Balance";
612 case V4L2_CID_AUDIO_BASS: return "Bass";
613 case V4L2_CID_AUDIO_TREBLE: return "Treble";
614 case V4L2_CID_AUDIO_MUTE: return "Mute";
615 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
616 case V4L2_CID_BLACK_LEVEL: return "Black Level";
617 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
618 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
619 case V4L2_CID_RED_BALANCE: return "Red Balance";
620 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
621 case V4L2_CID_GAMMA: return "Gamma";
622 case V4L2_CID_EXPOSURE: return "Exposure";
623 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
624 case V4L2_CID_GAIN: return "Gain";
625 case V4L2_CID_HFLIP: return "Horizontal Flip";
626 case V4L2_CID_VFLIP: return "Vertical Flip";
627 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
628 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
629 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
630 case V4L2_CID_SHARPNESS: return "Sharpness";
631 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
632 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
633 case V4L2_CID_COLOR_KILLER: return "Color Killer";
634 case V4L2_CID_COLORFX: return "Color Effects";
635 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
636 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
637 case V4L2_CID_ROTATE: return "Rotate";
638 case V4L2_CID_BG_COLOR: return "Background Color";
639 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
640 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
641 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
642 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
643 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
644 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
645 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
646
647 /* Codec controls */
648 /* The MPEG controls are applicable to all codec controls
649 * and the 'MPEG' part of the define is historical */
650 /* Keep the order of the 'case's the same as in videodev2.h! */
651 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
652 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
653 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
654 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
655 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
656 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
657 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
658 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
659 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
660 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
661 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
662 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
663 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
664 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
665 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
666 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
667 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
668 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
669 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
670 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
671 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
672 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
673 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
674 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
675 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
676 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
677 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
678 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
679 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
680 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
681 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
682 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
683 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
684 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
685 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
686 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
687 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
688 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
689 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
690 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
691 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
692 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
693 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
694 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
695 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
696 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
697 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
698 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
699 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
700 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
701 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
702 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
703 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
704 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
705 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
706 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
707 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
708 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
709 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
710 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
711 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
712 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
713 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
714 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
715 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
716 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
717 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
718 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
719 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
720 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
721 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
722 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
723 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
724 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
725 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
726 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
727 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
728 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
729 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
730 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
731 return "H264 Set QP Value for HC Layers";
732 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
733 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
734 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
735 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
736 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
737 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
738 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
739 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
740 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
741 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
742 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
743 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
744 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
745 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
746 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
747 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
748 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
749 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
750
751 /* VPX controls */
752 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
753 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
754 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
755 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
756 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
757 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
758 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
759 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
760 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
761 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
762 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
763 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
764
765 /* CAMERA controls */
766 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
767 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
768 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
769 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
770 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
771 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
772 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
773 case V4L2_CID_PAN_RESET: return "Pan, Reset";
774 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
775 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
776 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
777 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
778 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
779 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
780 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
781 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
782 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
783 case V4L2_CID_PRIVACY: return "Privacy";
784 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
785 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
786 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
787 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
788 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
789 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
790 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
791 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
792 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
793 case V4L2_CID_SCENE_MODE: return "Scene Mode";
794 case V4L2_CID_3A_LOCK: return "3A Lock";
795 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
796 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
797 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
798 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
799
800 /* FM Radio Modulator controls */
801 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
802 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
803 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
804 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
805 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
806 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
807 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
808 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
809 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
810 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
811 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
812 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
813 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
814 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
815 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
816 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
817 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
818 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
819 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
820 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
821 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
822
823 /* Flash controls */
824 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
825 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
826 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
827 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
828 case V4L2_CID_FLASH_STROBE: return "Strobe";
829 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
830 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
831 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
832 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
833 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
834 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
835 case V4L2_CID_FLASH_FAULT: return "Faults";
836 case V4L2_CID_FLASH_CHARGE: return "Charge";
837 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
838
839 /* JPEG encoder controls */
840 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
841 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
842 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
843 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
844 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
845 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
846
847 /* Image source controls */
848 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
849 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
850 case V4L2_CID_VBLANK: return "Vertical Blanking";
851 case V4L2_CID_HBLANK: return "Horizontal Blanking";
852 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
853
854 /* Image processing controls */
855 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
856 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
857 case V4L2_CID_LINK_FREQ: return "Link Frequency";
858 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
859 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
860
861 /* DV controls */
862 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
863 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
864 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
865 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
866 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
867 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
868 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
869 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
870 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
871
872 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
873 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
874 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
875
876 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
877 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
878 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
879 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
880 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
881 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
882 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
883 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
884 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
885 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
886
887 /* Detection controls */
888 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
889 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
890 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
891 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
892 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
893 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
894
895 default:
896 return NULL;
897 }
898 }
899 EXPORT_SYMBOL(v4l2_ctrl_get_name);
900
901 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
902 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
903 {
904 *name = v4l2_ctrl_get_name(id);
905 *flags = 0;
906
907 switch (id) {
908 case V4L2_CID_AUDIO_MUTE:
909 case V4L2_CID_AUDIO_LOUDNESS:
910 case V4L2_CID_AUTO_WHITE_BALANCE:
911 case V4L2_CID_AUTOGAIN:
912 case V4L2_CID_HFLIP:
913 case V4L2_CID_VFLIP:
914 case V4L2_CID_HUE_AUTO:
915 case V4L2_CID_CHROMA_AGC:
916 case V4L2_CID_COLOR_KILLER:
917 case V4L2_CID_AUTOBRIGHTNESS:
918 case V4L2_CID_MPEG_AUDIO_MUTE:
919 case V4L2_CID_MPEG_VIDEO_MUTE:
920 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
921 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
922 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
923 case V4L2_CID_FOCUS_AUTO:
924 case V4L2_CID_PRIVACY:
925 case V4L2_CID_AUDIO_LIMITER_ENABLED:
926 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
927 case V4L2_CID_PILOT_TONE_ENABLED:
928 case V4L2_CID_ILLUMINATORS_1:
929 case V4L2_CID_ILLUMINATORS_2:
930 case V4L2_CID_FLASH_STROBE_STATUS:
931 case V4L2_CID_FLASH_CHARGE:
932 case V4L2_CID_FLASH_READY:
933 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
934 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
935 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
936 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
937 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
938 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
939 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
940 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
941 case V4L2_CID_WIDE_DYNAMIC_RANGE:
942 case V4L2_CID_IMAGE_STABILIZATION:
943 case V4L2_CID_RDS_RECEPTION:
944 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
945 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
946 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
947 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
948 case V4L2_CID_RF_TUNER_PLL_LOCK:
949 *type = V4L2_CTRL_TYPE_BOOLEAN;
950 *min = 0;
951 *max = *step = 1;
952 break;
953 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
954 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
955 *type = V4L2_CTRL_TYPE_INTEGER;
956 break;
957 case V4L2_CID_PAN_RESET:
958 case V4L2_CID_TILT_RESET:
959 case V4L2_CID_FLASH_STROBE:
960 case V4L2_CID_FLASH_STROBE_STOP:
961 case V4L2_CID_AUTO_FOCUS_START:
962 case V4L2_CID_AUTO_FOCUS_STOP:
963 *type = V4L2_CTRL_TYPE_BUTTON;
964 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
965 *min = *max = *step = *def = 0;
966 break;
967 case V4L2_CID_POWER_LINE_FREQUENCY:
968 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
969 case V4L2_CID_MPEG_AUDIO_ENCODING:
970 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
971 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
972 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
973 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
974 case V4L2_CID_MPEG_AUDIO_MODE:
975 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
976 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
977 case V4L2_CID_MPEG_AUDIO_CRC:
978 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
979 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
980 case V4L2_CID_MPEG_VIDEO_ENCODING:
981 case V4L2_CID_MPEG_VIDEO_ASPECT:
982 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
983 case V4L2_CID_MPEG_STREAM_TYPE:
984 case V4L2_CID_MPEG_STREAM_VBI_FMT:
985 case V4L2_CID_EXPOSURE_AUTO:
986 case V4L2_CID_AUTO_FOCUS_RANGE:
987 case V4L2_CID_COLORFX:
988 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
989 case V4L2_CID_TUNE_PREEMPHASIS:
990 case V4L2_CID_FLASH_LED_MODE:
991 case V4L2_CID_FLASH_STROBE_SOURCE:
992 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
993 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
994 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
995 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
996 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
997 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
998 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
999 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1000 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1001 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1002 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1003 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1004 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1005 case V4L2_CID_EXPOSURE_METERING:
1006 case V4L2_CID_SCENE_MODE:
1007 case V4L2_CID_DV_TX_MODE:
1008 case V4L2_CID_DV_TX_RGB_RANGE:
1009 case V4L2_CID_DV_RX_RGB_RANGE:
1010 case V4L2_CID_TEST_PATTERN:
1011 case V4L2_CID_TUNE_DEEMPHASIS:
1012 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1013 case V4L2_CID_DETECT_MD_MODE:
1014 *type = V4L2_CTRL_TYPE_MENU;
1015 break;
1016 case V4L2_CID_LINK_FREQ:
1017 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1018 break;
1019 case V4L2_CID_RDS_TX_PS_NAME:
1020 case V4L2_CID_RDS_TX_RADIO_TEXT:
1021 *type = V4L2_CTRL_TYPE_STRING;
1022 break;
1023 case V4L2_CID_ISO_SENSITIVITY:
1024 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1025 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1026 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1027 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1028 break;
1029 case V4L2_CID_USER_CLASS:
1030 case V4L2_CID_CAMERA_CLASS:
1031 case V4L2_CID_MPEG_CLASS:
1032 case V4L2_CID_FM_TX_CLASS:
1033 case V4L2_CID_FLASH_CLASS:
1034 case V4L2_CID_JPEG_CLASS:
1035 case V4L2_CID_IMAGE_SOURCE_CLASS:
1036 case V4L2_CID_IMAGE_PROC_CLASS:
1037 case V4L2_CID_DV_CLASS:
1038 case V4L2_CID_FM_RX_CLASS:
1039 case V4L2_CID_RF_TUNER_CLASS:
1040 case V4L2_CID_DETECT_CLASS:
1041 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1042 /* You can neither read not write these */
1043 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1044 *min = *max = *step = *def = 0;
1045 break;
1046 case V4L2_CID_BG_COLOR:
1047 *type = V4L2_CTRL_TYPE_INTEGER;
1048 *step = 1;
1049 *min = 0;
1050 /* Max is calculated as RGB888 that is 2^24 */
1051 *max = 0xFFFFFF;
1052 break;
1053 case V4L2_CID_FLASH_FAULT:
1054 case V4L2_CID_JPEG_ACTIVE_MARKER:
1055 case V4L2_CID_3A_LOCK:
1056 case V4L2_CID_AUTO_FOCUS_STATUS:
1057 case V4L2_CID_DV_TX_HOTPLUG:
1058 case V4L2_CID_DV_TX_RXSENSE:
1059 case V4L2_CID_DV_TX_EDID_PRESENT:
1060 case V4L2_CID_DV_RX_POWER_PRESENT:
1061 *type = V4L2_CTRL_TYPE_BITMASK;
1062 break;
1063 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1064 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1065 *type = V4L2_CTRL_TYPE_INTEGER;
1066 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1067 break;
1068 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1069 *type = V4L2_CTRL_TYPE_INTEGER64;
1070 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1071 *min = *def = 0;
1072 *max = 0x1ffffffffLL;
1073 *step = 1;
1074 break;
1075 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1076 *type = V4L2_CTRL_TYPE_INTEGER64;
1077 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1078 *min = *def = 0;
1079 *max = 0x7fffffffffffffffLL;
1080 *step = 1;
1081 break;
1082 case V4L2_CID_PIXEL_RATE:
1083 *type = V4L2_CTRL_TYPE_INTEGER64;
1084 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1085 break;
1086 case V4L2_CID_DETECT_MD_REGION_GRID:
1087 *type = V4L2_CTRL_TYPE_U8;
1088 break;
1089 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1090 *type = V4L2_CTRL_TYPE_U16;
1091 break;
1092 default:
1093 *type = V4L2_CTRL_TYPE_INTEGER;
1094 break;
1095 }
1096 switch (id) {
1097 case V4L2_CID_MPEG_AUDIO_ENCODING:
1098 case V4L2_CID_MPEG_AUDIO_MODE:
1099 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1100 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1101 case V4L2_CID_MPEG_STREAM_TYPE:
1102 *flags |= V4L2_CTRL_FLAG_UPDATE;
1103 break;
1104 case V4L2_CID_AUDIO_VOLUME:
1105 case V4L2_CID_AUDIO_BALANCE:
1106 case V4L2_CID_AUDIO_BASS:
1107 case V4L2_CID_AUDIO_TREBLE:
1108 case V4L2_CID_BRIGHTNESS:
1109 case V4L2_CID_CONTRAST:
1110 case V4L2_CID_SATURATION:
1111 case V4L2_CID_HUE:
1112 case V4L2_CID_RED_BALANCE:
1113 case V4L2_CID_BLUE_BALANCE:
1114 case V4L2_CID_GAMMA:
1115 case V4L2_CID_SHARPNESS:
1116 case V4L2_CID_CHROMA_GAIN:
1117 case V4L2_CID_RDS_TX_DEVIATION:
1118 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1119 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1120 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1121 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1122 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1123 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1124 case V4L2_CID_PILOT_TONE_DEVIATION:
1125 case V4L2_CID_PILOT_TONE_FREQUENCY:
1126 case V4L2_CID_TUNE_POWER_LEVEL:
1127 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1128 case V4L2_CID_RF_TUNER_LNA_GAIN:
1129 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1130 case V4L2_CID_RF_TUNER_IF_GAIN:
1131 case V4L2_CID_RF_TUNER_BANDWIDTH:
1132 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1133 *flags |= V4L2_CTRL_FLAG_SLIDER;
1134 break;
1135 case V4L2_CID_PAN_RELATIVE:
1136 case V4L2_CID_TILT_RELATIVE:
1137 case V4L2_CID_FOCUS_RELATIVE:
1138 case V4L2_CID_IRIS_RELATIVE:
1139 case V4L2_CID_ZOOM_RELATIVE:
1140 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1141 break;
1142 case V4L2_CID_FLASH_STROBE_STATUS:
1143 case V4L2_CID_AUTO_FOCUS_STATUS:
1144 case V4L2_CID_FLASH_READY:
1145 case V4L2_CID_DV_TX_HOTPLUG:
1146 case V4L2_CID_DV_TX_RXSENSE:
1147 case V4L2_CID_DV_TX_EDID_PRESENT:
1148 case V4L2_CID_DV_RX_POWER_PRESENT:
1149 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1150 break;
1151 case V4L2_CID_RF_TUNER_PLL_LOCK:
1152 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1153 break;
1154 }
1155 }
1156 EXPORT_SYMBOL(v4l2_ctrl_fill);
1157
1158 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1159 {
1160 memset(ev->reserved, 0, sizeof(ev->reserved));
1161 ev->type = V4L2_EVENT_CTRL;
1162 ev->id = ctrl->id;
1163 ev->u.ctrl.changes = changes;
1164 ev->u.ctrl.type = ctrl->type;
1165 ev->u.ctrl.flags = ctrl->flags;
1166 if (ctrl->is_ptr)
1167 ev->u.ctrl.value64 = 0;
1168 else
1169 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1170 ev->u.ctrl.minimum = ctrl->minimum;
1171 ev->u.ctrl.maximum = ctrl->maximum;
1172 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1173 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1174 ev->u.ctrl.step = 1;
1175 else
1176 ev->u.ctrl.step = ctrl->step;
1177 ev->u.ctrl.default_value = ctrl->default_value;
1178 }
1179
1180 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1181 {
1182 struct v4l2_event ev;
1183 struct v4l2_subscribed_event *sev;
1184
1185 if (list_empty(&ctrl->ev_subs))
1186 return;
1187 fill_event(&ev, ctrl, changes);
1188
1189 list_for_each_entry(sev, &ctrl->ev_subs, node)
1190 if (sev->fh != fh ||
1191 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1192 v4l2_event_queue_fh(sev->fh, &ev);
1193 }
1194
1195 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1196 union v4l2_ctrl_ptr ptr1,
1197 union v4l2_ctrl_ptr ptr2)
1198 {
1199 switch (ctrl->type) {
1200 case V4L2_CTRL_TYPE_BUTTON:
1201 return false;
1202 case V4L2_CTRL_TYPE_STRING:
1203 idx *= ctrl->elem_size;
1204 /* strings are always 0-terminated */
1205 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1206 case V4L2_CTRL_TYPE_INTEGER64:
1207 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1208 case V4L2_CTRL_TYPE_U8:
1209 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1210 case V4L2_CTRL_TYPE_U16:
1211 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1212 default:
1213 if (ctrl->is_int)
1214 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1215 idx *= ctrl->elem_size;
1216 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1217 }
1218 }
1219
1220 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1221 union v4l2_ctrl_ptr ptr)
1222 {
1223 switch (ctrl->type) {
1224 case V4L2_CTRL_TYPE_STRING:
1225 idx *= ctrl->elem_size;
1226 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1227 ptr.p_char[idx + ctrl->minimum] = '\0';
1228 break;
1229 case V4L2_CTRL_TYPE_INTEGER64:
1230 ptr.p_s64[idx] = ctrl->default_value;
1231 break;
1232 case V4L2_CTRL_TYPE_INTEGER:
1233 case V4L2_CTRL_TYPE_INTEGER_MENU:
1234 case V4L2_CTRL_TYPE_MENU:
1235 case V4L2_CTRL_TYPE_BITMASK:
1236 case V4L2_CTRL_TYPE_BOOLEAN:
1237 ptr.p_s32[idx] = ctrl->default_value;
1238 break;
1239 case V4L2_CTRL_TYPE_U8:
1240 ptr.p_u8[idx] = ctrl->default_value;
1241 break;
1242 case V4L2_CTRL_TYPE_U16:
1243 ptr.p_u16[idx] = ctrl->default_value;
1244 break;
1245 default:
1246 idx *= ctrl->elem_size;
1247 memset(ptr.p + idx, 0, ctrl->elem_size);
1248 break;
1249 }
1250 }
1251
1252 static void std_log(const struct v4l2_ctrl *ctrl)
1253 {
1254 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1255
1256 if (ctrl->is_array) {
1257 unsigned i;
1258
1259 for (i = 0; i < ctrl->nr_of_dims; i++)
1260 pr_cont("[%u]", ctrl->dims[i]);
1261 pr_cont(" ");
1262 }
1263
1264 switch (ctrl->type) {
1265 case V4L2_CTRL_TYPE_INTEGER:
1266 pr_cont("%d", *ptr.p_s32);
1267 break;
1268 case V4L2_CTRL_TYPE_BOOLEAN:
1269 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1270 break;
1271 case V4L2_CTRL_TYPE_MENU:
1272 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1273 break;
1274 case V4L2_CTRL_TYPE_INTEGER_MENU:
1275 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1276 break;
1277 case V4L2_CTRL_TYPE_BITMASK:
1278 pr_cont("0x%08x", *ptr.p_s32);
1279 break;
1280 case V4L2_CTRL_TYPE_INTEGER64:
1281 pr_cont("%lld", *ptr.p_s64);
1282 break;
1283 case V4L2_CTRL_TYPE_STRING:
1284 pr_cont("%s", ptr.p_char);
1285 break;
1286 case V4L2_CTRL_TYPE_U8:
1287 pr_cont("%u", (unsigned)*ptr.p_u8);
1288 break;
1289 case V4L2_CTRL_TYPE_U16:
1290 pr_cont("%u", (unsigned)*ptr.p_u16);
1291 break;
1292 default:
1293 pr_cont("unknown type %d", ctrl->type);
1294 break;
1295 }
1296 }
1297
1298 /* Round towards the closest legal value */
1299 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1300 ({ \
1301 offset_type offset; \
1302 val += (ctrl)->step / 2; \
1303 val = clamp_t(typeof(val), val, \
1304 (ctrl)->minimum, (ctrl)->maximum); \
1305 offset = (val) - (ctrl)->minimum; \
1306 offset = (ctrl)->step * (offset / (s32)(ctrl)->step); \
1307 val = (ctrl)->minimum + offset; \
1308 0; \
1309 })
1310
1311 /* Validate a new control */
1312 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1313 union v4l2_ctrl_ptr ptr)
1314 {
1315 size_t len;
1316 u64 offset;
1317 s64 val;
1318
1319 switch (ctrl->type) {
1320 case V4L2_CTRL_TYPE_INTEGER:
1321 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1322 case V4L2_CTRL_TYPE_INTEGER64:
1323 /*
1324 * We can't use the ROUND_TO_RANGE define here due to
1325 * the u64 divide that needs special care.
1326 */
1327 val = ptr.p_s64[idx];
1328 val += ctrl->step / 2;
1329 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1330 offset = val - ctrl->minimum;
1331 do_div(offset, ctrl->step);
1332 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1333 return 0;
1334 case V4L2_CTRL_TYPE_U8:
1335 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1336 case V4L2_CTRL_TYPE_U16:
1337 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1338
1339 case V4L2_CTRL_TYPE_BOOLEAN:
1340 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1341 return 0;
1342
1343 case V4L2_CTRL_TYPE_MENU:
1344 case V4L2_CTRL_TYPE_INTEGER_MENU:
1345 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1346 return -ERANGE;
1347 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1348 return -EINVAL;
1349 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1350 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1351 return -EINVAL;
1352 return 0;
1353
1354 case V4L2_CTRL_TYPE_BITMASK:
1355 ptr.p_s32[idx] &= ctrl->maximum;
1356 return 0;
1357
1358 case V4L2_CTRL_TYPE_BUTTON:
1359 case V4L2_CTRL_TYPE_CTRL_CLASS:
1360 ptr.p_s32[idx] = 0;
1361 return 0;
1362
1363 case V4L2_CTRL_TYPE_STRING:
1364 idx *= ctrl->elem_size;
1365 len = strlen(ptr.p_char + idx);
1366 if (len < ctrl->minimum)
1367 return -ERANGE;
1368 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1369 return -ERANGE;
1370 return 0;
1371
1372 default:
1373 return -EINVAL;
1374 }
1375 }
1376
1377 static const struct v4l2_ctrl_type_ops std_type_ops = {
1378 .equal = std_equal,
1379 .init = std_init,
1380 .log = std_log,
1381 .validate = std_validate,
1382 };
1383
1384 /* Helper function: copy the given control value back to the caller */
1385 static int ptr_to_user(struct v4l2_ext_control *c,
1386 struct v4l2_ctrl *ctrl,
1387 union v4l2_ctrl_ptr ptr)
1388 {
1389 u32 len;
1390
1391 if (ctrl->is_ptr && !ctrl->is_string)
1392 return copy_to_user(c->ptr, ptr.p, c->size) ?
1393 -EFAULT : 0;
1394
1395 switch (ctrl->type) {
1396 case V4L2_CTRL_TYPE_STRING:
1397 len = strlen(ptr.p_char);
1398 if (c->size < len + 1) {
1399 c->size = ctrl->elem_size;
1400 return -ENOSPC;
1401 }
1402 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1403 -EFAULT : 0;
1404 case V4L2_CTRL_TYPE_INTEGER64:
1405 c->value64 = *ptr.p_s64;
1406 break;
1407 default:
1408 c->value = *ptr.p_s32;
1409 break;
1410 }
1411 return 0;
1412 }
1413
1414 /* Helper function: copy the current control value back to the caller */
1415 static int cur_to_user(struct v4l2_ext_control *c,
1416 struct v4l2_ctrl *ctrl)
1417 {
1418 return ptr_to_user(c, ctrl, ctrl->p_cur);
1419 }
1420
1421 /* Helper function: copy the new control value back to the caller */
1422 static int new_to_user(struct v4l2_ext_control *c,
1423 struct v4l2_ctrl *ctrl)
1424 {
1425 return ptr_to_user(c, ctrl, ctrl->p_new);
1426 }
1427
1428 /* Helper function: copy the caller-provider value to the given control value */
1429 static int user_to_ptr(struct v4l2_ext_control *c,
1430 struct v4l2_ctrl *ctrl,
1431 union v4l2_ctrl_ptr ptr)
1432 {
1433 int ret;
1434 u32 size;
1435
1436 ctrl->is_new = 1;
1437 if (ctrl->is_ptr && !ctrl->is_string) {
1438 unsigned idx;
1439
1440 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1441 if (ret || !ctrl->is_array)
1442 return ret;
1443 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1444 ctrl->type_ops->init(ctrl, idx, ptr);
1445 return 0;
1446 }
1447
1448 switch (ctrl->type) {
1449 case V4L2_CTRL_TYPE_INTEGER64:
1450 *ptr.p_s64 = c->value64;
1451 break;
1452 case V4L2_CTRL_TYPE_STRING:
1453 size = c->size;
1454 if (size == 0)
1455 return -ERANGE;
1456 if (size > ctrl->maximum + 1)
1457 size = ctrl->maximum + 1;
1458 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1459 if (!ret) {
1460 char last = ptr.p_char[size - 1];
1461
1462 ptr.p_char[size - 1] = 0;
1463 /* If the string was longer than ctrl->maximum,
1464 then return an error. */
1465 if (strlen(ptr.p_char) == ctrl->maximum && last)
1466 return -ERANGE;
1467 }
1468 return ret;
1469 default:
1470 *ptr.p_s32 = c->value;
1471 break;
1472 }
1473 return 0;
1474 }
1475
1476 /* Helper function: copy the caller-provider value as the new control value */
1477 static int user_to_new(struct v4l2_ext_control *c,
1478 struct v4l2_ctrl *ctrl)
1479 {
1480 return user_to_ptr(c, ctrl, ctrl->p_new);
1481 }
1482
1483 /* Copy the one value to another. */
1484 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1485 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1486 {
1487 if (ctrl == NULL)
1488 return;
1489 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1490 }
1491
1492 /* Copy the new value to the current value. */
1493 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1494 {
1495 bool changed;
1496
1497 if (ctrl == NULL)
1498 return;
1499
1500 /* has_changed is set by cluster_changed */
1501 changed = ctrl->has_changed;
1502 if (changed)
1503 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1504
1505 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1506 /* Note: CH_FLAGS is only set for auto clusters. */
1507 ctrl->flags &=
1508 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1509 if (!is_cur_manual(ctrl->cluster[0])) {
1510 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1511 if (ctrl->cluster[0]->has_volatiles)
1512 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1513 }
1514 fh = NULL;
1515 }
1516 if (changed || ch_flags) {
1517 /* If a control was changed that was not one of the controls
1518 modified by the application, then send the event to all. */
1519 if (!ctrl->is_new)
1520 fh = NULL;
1521 send_event(fh, ctrl,
1522 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1523 if (ctrl->call_notify && changed && ctrl->handler->notify)
1524 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1525 }
1526 }
1527
1528 /* Copy the current value to the new value */
1529 static void cur_to_new(struct v4l2_ctrl *ctrl)
1530 {
1531 if (ctrl == NULL)
1532 return;
1533 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1534 }
1535
1536 /* Return non-zero if one or more of the controls in the cluster has a new
1537 value that differs from the current value. */
1538 static int cluster_changed(struct v4l2_ctrl *master)
1539 {
1540 bool changed = false;
1541 unsigned idx;
1542 int i;
1543
1544 for (i = 0; i < master->ncontrols; i++) {
1545 struct v4l2_ctrl *ctrl = master->cluster[i];
1546 bool ctrl_changed = false;
1547
1548 if (ctrl == NULL)
1549 continue;
1550 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1551 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1552 ctrl->p_cur, ctrl->p_new);
1553 ctrl->has_changed = ctrl_changed;
1554 changed |= ctrl->has_changed;
1555 }
1556 return changed;
1557 }
1558
1559 /* Control range checking */
1560 static int check_range(enum v4l2_ctrl_type type,
1561 s64 min, s64 max, u64 step, s64 def)
1562 {
1563 switch (type) {
1564 case V4L2_CTRL_TYPE_BOOLEAN:
1565 if (step != 1 || max > 1 || min < 0)
1566 return -ERANGE;
1567 /* fall through */
1568 case V4L2_CTRL_TYPE_U8:
1569 case V4L2_CTRL_TYPE_U16:
1570 case V4L2_CTRL_TYPE_INTEGER:
1571 case V4L2_CTRL_TYPE_INTEGER64:
1572 if (step == 0 || min > max || def < min || def > max)
1573 return -ERANGE;
1574 return 0;
1575 case V4L2_CTRL_TYPE_BITMASK:
1576 if (step || min || !max || (def & ~max))
1577 return -ERANGE;
1578 return 0;
1579 case V4L2_CTRL_TYPE_MENU:
1580 case V4L2_CTRL_TYPE_INTEGER_MENU:
1581 if (min > max || def < min || def > max)
1582 return -ERANGE;
1583 /* Note: step == menu_skip_mask for menu controls.
1584 So here we check if the default value is masked out. */
1585 if (step && ((1 << def) & step))
1586 return -EINVAL;
1587 return 0;
1588 case V4L2_CTRL_TYPE_STRING:
1589 if (min > max || min < 0 || step < 1 || def)
1590 return -ERANGE;
1591 return 0;
1592 default:
1593 return 0;
1594 }
1595 }
1596
1597 /* Validate a new control */
1598 static int validate_new(const struct v4l2_ctrl *ctrl,
1599 struct v4l2_ext_control *c)
1600 {
1601 union v4l2_ctrl_ptr ptr;
1602 unsigned idx;
1603 int err = 0;
1604
1605 if (!ctrl->is_ptr) {
1606 switch (ctrl->type) {
1607 case V4L2_CTRL_TYPE_INTEGER:
1608 case V4L2_CTRL_TYPE_INTEGER_MENU:
1609 case V4L2_CTRL_TYPE_MENU:
1610 case V4L2_CTRL_TYPE_BITMASK:
1611 case V4L2_CTRL_TYPE_BOOLEAN:
1612 case V4L2_CTRL_TYPE_BUTTON:
1613 case V4L2_CTRL_TYPE_CTRL_CLASS:
1614 ptr.p_s32 = &c->value;
1615 return ctrl->type_ops->validate(ctrl, 0, ptr);
1616
1617 case V4L2_CTRL_TYPE_INTEGER64:
1618 ptr.p_s64 = &c->value64;
1619 return ctrl->type_ops->validate(ctrl, 0, ptr);
1620 default:
1621 break;
1622 }
1623 }
1624 ptr.p = c->ptr;
1625 for (idx = 0; !err && idx < c->size / ctrl->elem_size; idx++)
1626 err = ctrl->type_ops->validate(ctrl, idx, ptr);
1627 return err;
1628 }
1629
1630 static inline u32 node2id(struct list_head *node)
1631 {
1632 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1633 }
1634
1635 /* Set the handler's error code if it wasn't set earlier already */
1636 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1637 {
1638 if (hdl->error == 0)
1639 hdl->error = err;
1640 return err;
1641 }
1642
1643 /* Initialize the handler */
1644 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1645 unsigned nr_of_controls_hint,
1646 struct lock_class_key *key, const char *name)
1647 {
1648 hdl->lock = &hdl->_lock;
1649 mutex_init(hdl->lock);
1650 lockdep_set_class_and_name(hdl->lock, key, name);
1651 INIT_LIST_HEAD(&hdl->ctrls);
1652 INIT_LIST_HEAD(&hdl->ctrl_refs);
1653 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1654 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1655 GFP_KERNEL);
1656 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1657 return hdl->error;
1658 }
1659 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1660
1661 /* Free all controls and control refs */
1662 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1663 {
1664 struct v4l2_ctrl_ref *ref, *next_ref;
1665 struct v4l2_ctrl *ctrl, *next_ctrl;
1666 struct v4l2_subscribed_event *sev, *next_sev;
1667
1668 if (hdl == NULL || hdl->buckets == NULL)
1669 return;
1670
1671 mutex_lock(hdl->lock);
1672 /* Free all nodes */
1673 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1674 list_del(&ref->node);
1675 kfree(ref);
1676 }
1677 /* Free all controls owned by the handler */
1678 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1679 list_del(&ctrl->node);
1680 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1681 list_del(&sev->node);
1682 kfree(ctrl);
1683 }
1684 kfree(hdl->buckets);
1685 hdl->buckets = NULL;
1686 hdl->cached = NULL;
1687 hdl->error = 0;
1688 mutex_unlock(hdl->lock);
1689 }
1690 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1691
1692 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1693 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1694 with applications that do not use the NEXT_CTRL flag.
1695
1696 We just find the n-th private user control. It's O(N), but that should not
1697 be an issue in this particular case. */
1698 static struct v4l2_ctrl_ref *find_private_ref(
1699 struct v4l2_ctrl_handler *hdl, u32 id)
1700 {
1701 struct v4l2_ctrl_ref *ref;
1702
1703 id -= V4L2_CID_PRIVATE_BASE;
1704 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1705 /* Search for private user controls that are compatible with
1706 VIDIOC_G/S_CTRL. */
1707 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1708 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1709 if (!ref->ctrl->is_int)
1710 continue;
1711 if (id == 0)
1712 return ref;
1713 id--;
1714 }
1715 }
1716 return NULL;
1717 }
1718
1719 /* Find a control with the given ID. */
1720 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1721 {
1722 struct v4l2_ctrl_ref *ref;
1723 int bucket;
1724
1725 id &= V4L2_CTRL_ID_MASK;
1726
1727 /* Old-style private controls need special handling */
1728 if (id >= V4L2_CID_PRIVATE_BASE)
1729 return find_private_ref(hdl, id);
1730 bucket = id % hdl->nr_of_buckets;
1731
1732 /* Simple optimization: cache the last control found */
1733 if (hdl->cached && hdl->cached->ctrl->id == id)
1734 return hdl->cached;
1735
1736 /* Not in cache, search the hash */
1737 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1738 while (ref && ref->ctrl->id != id)
1739 ref = ref->next;
1740
1741 if (ref)
1742 hdl->cached = ref; /* cache it! */
1743 return ref;
1744 }
1745
1746 /* Find a control with the given ID. Take the handler's lock first. */
1747 static struct v4l2_ctrl_ref *find_ref_lock(
1748 struct v4l2_ctrl_handler *hdl, u32 id)
1749 {
1750 struct v4l2_ctrl_ref *ref = NULL;
1751
1752 if (hdl) {
1753 mutex_lock(hdl->lock);
1754 ref = find_ref(hdl, id);
1755 mutex_unlock(hdl->lock);
1756 }
1757 return ref;
1758 }
1759
1760 /* Find a control with the given ID. */
1761 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1762 {
1763 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1764
1765 return ref ? ref->ctrl : NULL;
1766 }
1767 EXPORT_SYMBOL(v4l2_ctrl_find);
1768
1769 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1770 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1771 struct v4l2_ctrl *ctrl)
1772 {
1773 struct v4l2_ctrl_ref *ref;
1774 struct v4l2_ctrl_ref *new_ref;
1775 u32 id = ctrl->id;
1776 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1777 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1778
1779 /*
1780 * Automatically add the control class if it is not yet present and
1781 * the new control is not a compound control.
1782 */
1783 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1784 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1785 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1786 return hdl->error;
1787
1788 if (hdl->error)
1789 return hdl->error;
1790
1791 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1792 if (!new_ref)
1793 return handler_set_err(hdl, -ENOMEM);
1794 new_ref->ctrl = ctrl;
1795 if (ctrl->handler == hdl) {
1796 /* By default each control starts in a cluster of its own.
1797 new_ref->ctrl is basically a cluster array with one
1798 element, so that's perfect to use as the cluster pointer.
1799 But only do this for the handler that owns the control. */
1800 ctrl->cluster = &new_ref->ctrl;
1801 ctrl->ncontrols = 1;
1802 }
1803
1804 INIT_LIST_HEAD(&new_ref->node);
1805
1806 mutex_lock(hdl->lock);
1807
1808 /* Add immediately at the end of the list if the list is empty, or if
1809 the last element in the list has a lower ID.
1810 This ensures that when elements are added in ascending order the
1811 insertion is an O(1) operation. */
1812 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1813 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1814 goto insert_in_hash;
1815 }
1816
1817 /* Find insert position in sorted list */
1818 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1819 if (ref->ctrl->id < id)
1820 continue;
1821 /* Don't add duplicates */
1822 if (ref->ctrl->id == id) {
1823 kfree(new_ref);
1824 goto unlock;
1825 }
1826 list_add(&new_ref->node, ref->node.prev);
1827 break;
1828 }
1829
1830 insert_in_hash:
1831 /* Insert the control node in the hash */
1832 new_ref->next = hdl->buckets[bucket];
1833 hdl->buckets[bucket] = new_ref;
1834
1835 unlock:
1836 mutex_unlock(hdl->lock);
1837 return 0;
1838 }
1839
1840 /* Add a new control */
1841 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1842 const struct v4l2_ctrl_ops *ops,
1843 const struct v4l2_ctrl_type_ops *type_ops,
1844 u32 id, const char *name, enum v4l2_ctrl_type type,
1845 s64 min, s64 max, u64 step, s64 def,
1846 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1847 u32 flags, const char * const *qmenu,
1848 const s64 *qmenu_int, void *priv)
1849 {
1850 struct v4l2_ctrl *ctrl;
1851 unsigned sz_extra;
1852 unsigned nr_of_dims = 0;
1853 unsigned elems = 1;
1854 bool is_array;
1855 unsigned tot_ctrl_size;
1856 unsigned idx;
1857 void *data;
1858 int err;
1859
1860 if (hdl->error)
1861 return NULL;
1862
1863 while (dims && dims[nr_of_dims]) {
1864 elems *= dims[nr_of_dims];
1865 nr_of_dims++;
1866 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1867 break;
1868 }
1869 is_array = nr_of_dims > 0;
1870
1871 /* Prefill elem_size for all types handled by std_type_ops */
1872 switch (type) {
1873 case V4L2_CTRL_TYPE_INTEGER64:
1874 elem_size = sizeof(s64);
1875 break;
1876 case V4L2_CTRL_TYPE_STRING:
1877 elem_size = max + 1;
1878 break;
1879 case V4L2_CTRL_TYPE_U8:
1880 elem_size = sizeof(u8);
1881 break;
1882 case V4L2_CTRL_TYPE_U16:
1883 elem_size = sizeof(u16);
1884 break;
1885 default:
1886 if (type < V4L2_CTRL_COMPOUND_TYPES)
1887 elem_size = sizeof(s32);
1888 break;
1889 }
1890 tot_ctrl_size = elem_size * elems;
1891
1892 /* Sanity checks */
1893 if (id == 0 || name == NULL || !elem_size ||
1894 id >= V4L2_CID_PRIVATE_BASE ||
1895 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1896 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1897 handler_set_err(hdl, -ERANGE);
1898 return NULL;
1899 }
1900 err = check_range(type, min, max, step, def);
1901 if (err) {
1902 handler_set_err(hdl, err);
1903 return NULL;
1904 }
1905 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1906 handler_set_err(hdl, -ERANGE);
1907 return NULL;
1908 }
1909 if (is_array &&
1910 (type == V4L2_CTRL_TYPE_BUTTON ||
1911 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
1912 handler_set_err(hdl, -EINVAL);
1913 return NULL;
1914 }
1915
1916 sz_extra = 0;
1917 if (type == V4L2_CTRL_TYPE_BUTTON)
1918 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1919 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1920 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1921 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
1922 type == V4L2_CTRL_TYPE_STRING ||
1923 type >= V4L2_CTRL_COMPOUND_TYPES ||
1924 is_array)
1925 sz_extra += 2 * tot_ctrl_size;
1926
1927 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1928 if (ctrl == NULL) {
1929 handler_set_err(hdl, -ENOMEM);
1930 return NULL;
1931 }
1932
1933 INIT_LIST_HEAD(&ctrl->node);
1934 INIT_LIST_HEAD(&ctrl->ev_subs);
1935 ctrl->handler = hdl;
1936 ctrl->ops = ops;
1937 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
1938 ctrl->id = id;
1939 ctrl->name = name;
1940 ctrl->type = type;
1941 ctrl->flags = flags;
1942 ctrl->minimum = min;
1943 ctrl->maximum = max;
1944 ctrl->step = step;
1945 ctrl->default_value = def;
1946 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
1947 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
1948 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
1949 ctrl->is_array = is_array;
1950 ctrl->elems = elems;
1951 ctrl->nr_of_dims = nr_of_dims;
1952 if (nr_of_dims)
1953 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
1954 ctrl->elem_size = elem_size;
1955 if (type == V4L2_CTRL_TYPE_MENU)
1956 ctrl->qmenu = qmenu;
1957 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1958 ctrl->qmenu_int = qmenu_int;
1959 ctrl->priv = priv;
1960 ctrl->cur.val = ctrl->val = def;
1961 data = &ctrl[1];
1962
1963 if (!ctrl->is_int) {
1964 ctrl->p_new.p = data;
1965 ctrl->p_cur.p = data + tot_ctrl_size;
1966 } else {
1967 ctrl->p_new.p = &ctrl->val;
1968 ctrl->p_cur.p = &ctrl->cur.val;
1969 }
1970 for (idx = 0; idx < elems; idx++) {
1971 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
1972 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1973 }
1974
1975 if (handler_new_ref(hdl, ctrl)) {
1976 kfree(ctrl);
1977 return NULL;
1978 }
1979 mutex_lock(hdl->lock);
1980 list_add_tail(&ctrl->node, &hdl->ctrls);
1981 mutex_unlock(hdl->lock);
1982 return ctrl;
1983 }
1984
1985 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1986 const struct v4l2_ctrl_config *cfg, void *priv)
1987 {
1988 bool is_menu;
1989 struct v4l2_ctrl *ctrl;
1990 const char *name = cfg->name;
1991 const char * const *qmenu = cfg->qmenu;
1992 const s64 *qmenu_int = cfg->qmenu_int;
1993 enum v4l2_ctrl_type type = cfg->type;
1994 u32 flags = cfg->flags;
1995 s64 min = cfg->min;
1996 s64 max = cfg->max;
1997 u64 step = cfg->step;
1998 s64 def = cfg->def;
1999
2000 if (name == NULL)
2001 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2002 &def, &flags);
2003
2004 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2005 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2006 if (is_menu)
2007 WARN_ON(step);
2008 else
2009 WARN_ON(cfg->menu_skip_mask);
2010 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2011 qmenu = v4l2_ctrl_get_menu(cfg->id);
2012 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2013 qmenu_int == NULL) {
2014 handler_set_err(hdl, -EINVAL);
2015 return NULL;
2016 }
2017
2018 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2019 type, min, max,
2020 is_menu ? cfg->menu_skip_mask : step, def,
2021 cfg->dims, cfg->elem_size,
2022 flags, qmenu, qmenu_int, priv);
2023 if (ctrl)
2024 ctrl->is_private = cfg->is_private;
2025 return ctrl;
2026 }
2027 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2028
2029 /* Helper function for standard non-menu controls */
2030 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2031 const struct v4l2_ctrl_ops *ops,
2032 u32 id, s64 min, s64 max, u64 step, s64 def)
2033 {
2034 const char *name;
2035 enum v4l2_ctrl_type type;
2036 u32 flags;
2037
2038 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2039 if (type == V4L2_CTRL_TYPE_MENU ||
2040 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2041 type >= V4L2_CTRL_COMPOUND_TYPES) {
2042 handler_set_err(hdl, -EINVAL);
2043 return NULL;
2044 }
2045 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2046 min, max, step, def, NULL, 0,
2047 flags, NULL, NULL, NULL);
2048 }
2049 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2050
2051 /* Helper function for standard menu controls */
2052 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2053 const struct v4l2_ctrl_ops *ops,
2054 u32 id, u8 _max, u64 mask, u8 _def)
2055 {
2056 const char * const *qmenu = NULL;
2057 const s64 *qmenu_int = NULL;
2058 unsigned int qmenu_int_len = 0;
2059 const char *name;
2060 enum v4l2_ctrl_type type;
2061 s64 min;
2062 s64 max = _max;
2063 s64 def = _def;
2064 u64 step;
2065 u32 flags;
2066
2067 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2068
2069 if (type == V4L2_CTRL_TYPE_MENU)
2070 qmenu = v4l2_ctrl_get_menu(id);
2071 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2072 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2073
2074 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2075 handler_set_err(hdl, -EINVAL);
2076 return NULL;
2077 }
2078 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2079 0, max, mask, def, NULL, 0,
2080 flags, qmenu, qmenu_int, NULL);
2081 }
2082 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2083
2084 /* Helper function for standard menu controls with driver defined menu */
2085 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2086 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2087 u64 mask, u8 _def, const char * const *qmenu)
2088 {
2089 enum v4l2_ctrl_type type;
2090 const char *name;
2091 u32 flags;
2092 u64 step;
2093 s64 min;
2094 s64 max = _max;
2095 s64 def = _def;
2096
2097 /* v4l2_ctrl_new_std_menu_items() should only be called for
2098 * standard controls without a standard menu.
2099 */
2100 if (v4l2_ctrl_get_menu(id)) {
2101 handler_set_err(hdl, -EINVAL);
2102 return NULL;
2103 }
2104
2105 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2106 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2107 handler_set_err(hdl, -EINVAL);
2108 return NULL;
2109 }
2110 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2111 0, max, mask, def, NULL, 0,
2112 flags, qmenu, NULL, NULL);
2113
2114 }
2115 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2116
2117 /* Helper function for standard integer menu controls */
2118 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2119 const struct v4l2_ctrl_ops *ops,
2120 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2121 {
2122 const char *name;
2123 enum v4l2_ctrl_type type;
2124 s64 min;
2125 u64 step;
2126 s64 max = _max;
2127 s64 def = _def;
2128 u32 flags;
2129
2130 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2131 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2132 handler_set_err(hdl, -EINVAL);
2133 return NULL;
2134 }
2135 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2136 0, max, 0, def, NULL, 0,
2137 flags, NULL, qmenu_int, NULL);
2138 }
2139 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2140
2141 /* Add a control from another handler to this handler */
2142 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
2143 struct v4l2_ctrl *ctrl)
2144 {
2145 if (hdl == NULL || hdl->error)
2146 return NULL;
2147 if (ctrl == NULL) {
2148 handler_set_err(hdl, -EINVAL);
2149 return NULL;
2150 }
2151 if (ctrl->handler == hdl)
2152 return ctrl;
2153 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
2154 }
2155 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
2156
2157 /* Add the controls from another handler to our own. */
2158 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2159 struct v4l2_ctrl_handler *add,
2160 bool (*filter)(const struct v4l2_ctrl *ctrl))
2161 {
2162 struct v4l2_ctrl_ref *ref;
2163 int ret = 0;
2164
2165 /* Do nothing if either handler is NULL or if they are the same */
2166 if (!hdl || !add || hdl == add)
2167 return 0;
2168 if (hdl->error)
2169 return hdl->error;
2170 mutex_lock(add->lock);
2171 list_for_each_entry(ref, &add->ctrl_refs, node) {
2172 struct v4l2_ctrl *ctrl = ref->ctrl;
2173
2174 /* Skip handler-private controls. */
2175 if (ctrl->is_private)
2176 continue;
2177 /* And control classes */
2178 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2179 continue;
2180 /* Filter any unwanted controls */
2181 if (filter && !filter(ctrl))
2182 continue;
2183 ret = handler_new_ref(hdl, ctrl);
2184 if (ret)
2185 break;
2186 }
2187 mutex_unlock(add->lock);
2188 return ret;
2189 }
2190 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2191
2192 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2193 {
2194 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2195 return true;
2196 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2197 return true;
2198 switch (ctrl->id) {
2199 case V4L2_CID_AUDIO_MUTE:
2200 case V4L2_CID_AUDIO_VOLUME:
2201 case V4L2_CID_AUDIO_BALANCE:
2202 case V4L2_CID_AUDIO_BASS:
2203 case V4L2_CID_AUDIO_TREBLE:
2204 case V4L2_CID_AUDIO_LOUDNESS:
2205 return true;
2206 default:
2207 break;
2208 }
2209 return false;
2210 }
2211 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2212
2213 /* Cluster controls */
2214 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2215 {
2216 bool has_volatiles = false;
2217 int i;
2218
2219 /* The first control is the master control and it must not be NULL */
2220 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2221 return;
2222
2223 for (i = 0; i < ncontrols; i++) {
2224 if (controls[i]) {
2225 controls[i]->cluster = controls;
2226 controls[i]->ncontrols = ncontrols;
2227 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2228 has_volatiles = true;
2229 }
2230 }
2231 controls[0]->has_volatiles = has_volatiles;
2232 }
2233 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2234
2235 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2236 u8 manual_val, bool set_volatile)
2237 {
2238 struct v4l2_ctrl *master = controls[0];
2239 u32 flag = 0;
2240 int i;
2241
2242 v4l2_ctrl_cluster(ncontrols, controls);
2243 WARN_ON(ncontrols <= 1);
2244 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2245 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2246 master->is_auto = true;
2247 master->has_volatiles = set_volatile;
2248 master->manual_mode_value = manual_val;
2249 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2250
2251 if (!is_cur_manual(master))
2252 flag = V4L2_CTRL_FLAG_INACTIVE |
2253 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2254
2255 for (i = 1; i < ncontrols; i++)
2256 if (controls[i])
2257 controls[i]->flags |= flag;
2258 }
2259 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2260
2261 /* Activate/deactivate a control. */
2262 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2263 {
2264 /* invert since the actual flag is called 'inactive' */
2265 bool inactive = !active;
2266 bool old;
2267
2268 if (ctrl == NULL)
2269 return;
2270
2271 if (inactive)
2272 /* set V4L2_CTRL_FLAG_INACTIVE */
2273 old = test_and_set_bit(4, &ctrl->flags);
2274 else
2275 /* clear V4L2_CTRL_FLAG_INACTIVE */
2276 old = test_and_clear_bit(4, &ctrl->flags);
2277 if (old != inactive)
2278 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2279 }
2280 EXPORT_SYMBOL(v4l2_ctrl_activate);
2281
2282 /* Grab/ungrab a control.
2283 Typically used when streaming starts and you want to grab controls,
2284 preventing the user from changing them.
2285
2286 Just call this and the framework will block any attempts to change
2287 these controls. */
2288 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2289 {
2290 bool old;
2291
2292 if (ctrl == NULL)
2293 return;
2294
2295 v4l2_ctrl_lock(ctrl);
2296 if (grabbed)
2297 /* set V4L2_CTRL_FLAG_GRABBED */
2298 old = test_and_set_bit(1, &ctrl->flags);
2299 else
2300 /* clear V4L2_CTRL_FLAG_GRABBED */
2301 old = test_and_clear_bit(1, &ctrl->flags);
2302 if (old != grabbed)
2303 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2304 v4l2_ctrl_unlock(ctrl);
2305 }
2306 EXPORT_SYMBOL(v4l2_ctrl_grab);
2307
2308 /* Log the control name and value */
2309 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2310 const char *prefix, const char *colon)
2311 {
2312 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2313 return;
2314 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2315 return;
2316
2317 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2318
2319 ctrl->type_ops->log(ctrl);
2320
2321 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2322 V4L2_CTRL_FLAG_GRABBED |
2323 V4L2_CTRL_FLAG_VOLATILE)) {
2324 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2325 pr_cont(" inactive");
2326 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2327 pr_cont(" grabbed");
2328 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2329 pr_cont(" volatile");
2330 }
2331 pr_cont("\n");
2332 }
2333
2334 /* Log all controls owned by the handler */
2335 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2336 const char *prefix)
2337 {
2338 struct v4l2_ctrl *ctrl;
2339 const char *colon = "";
2340 int len;
2341
2342 if (hdl == NULL)
2343 return;
2344 if (prefix == NULL)
2345 prefix = "";
2346 len = strlen(prefix);
2347 if (len && prefix[len - 1] != ' ')
2348 colon = ": ";
2349 mutex_lock(hdl->lock);
2350 list_for_each_entry(ctrl, &hdl->ctrls, node)
2351 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2352 log_ctrl(ctrl, prefix, colon);
2353 mutex_unlock(hdl->lock);
2354 }
2355 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2356
2357 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2358 {
2359 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2360 return 0;
2361 }
2362 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2363
2364 /* Call s_ctrl for all controls owned by the handler */
2365 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2366 {
2367 struct v4l2_ctrl *ctrl;
2368 int ret = 0;
2369
2370 if (hdl == NULL)
2371 return 0;
2372 mutex_lock(hdl->lock);
2373 list_for_each_entry(ctrl, &hdl->ctrls, node)
2374 ctrl->done = false;
2375
2376 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2377 struct v4l2_ctrl *master = ctrl->cluster[0];
2378 int i;
2379
2380 /* Skip if this control was already handled by a cluster. */
2381 /* Skip button controls and read-only controls. */
2382 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2383 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2384 continue;
2385
2386 for (i = 0; i < master->ncontrols; i++) {
2387 if (master->cluster[i]) {
2388 cur_to_new(master->cluster[i]);
2389 master->cluster[i]->is_new = 1;
2390 master->cluster[i]->done = true;
2391 }
2392 }
2393 ret = call_op(master, s_ctrl);
2394 if (ret)
2395 break;
2396 }
2397 mutex_unlock(hdl->lock);
2398 return ret;
2399 }
2400 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2401
2402 /* Implement VIDIOC_QUERY_EXT_CTRL */
2403 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2404 {
2405 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2406 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2407 struct v4l2_ctrl_ref *ref;
2408 struct v4l2_ctrl *ctrl;
2409
2410 if (hdl == NULL)
2411 return -EINVAL;
2412
2413 mutex_lock(hdl->lock);
2414
2415 /* Try to find it */
2416 ref = find_ref(hdl, id);
2417
2418 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2419 bool is_compound;
2420 /* Match any control that is not hidden */
2421 unsigned mask = 1;
2422 bool match = false;
2423
2424 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2425 /* Match any hidden control */
2426 match = true;
2427 } else if ((qc->id & next_flags) == next_flags) {
2428 /* Match any control, compound or not */
2429 mask = 0;
2430 }
2431
2432 /* Find the next control with ID > qc->id */
2433
2434 /* Did we reach the end of the control list? */
2435 if (id >= node2id(hdl->ctrl_refs.prev)) {
2436 ref = NULL; /* Yes, so there is no next control */
2437 } else if (ref) {
2438 /* We found a control with the given ID, so just get
2439 the next valid one in the list. */
2440 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2441 is_compound =
2442 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2443 if (id < ref->ctrl->id &&
2444 (is_compound & mask) == match)
2445 break;
2446 }
2447 if (&ref->node == &hdl->ctrl_refs)
2448 ref = NULL;
2449 } else {
2450 /* No control with the given ID exists, so start
2451 searching for the next largest ID. We know there
2452 is one, otherwise the first 'if' above would have
2453 been true. */
2454 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2455 is_compound =
2456 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2457 if (id < ref->ctrl->id &&
2458 (is_compound & mask) == match)
2459 break;
2460 }
2461 if (&ref->node == &hdl->ctrl_refs)
2462 ref = NULL;
2463 }
2464 }
2465 mutex_unlock(hdl->lock);
2466
2467 if (!ref)
2468 return -EINVAL;
2469
2470 ctrl = ref->ctrl;
2471 memset(qc, 0, sizeof(*qc));
2472 if (id >= V4L2_CID_PRIVATE_BASE)
2473 qc->id = id;
2474 else
2475 qc->id = ctrl->id;
2476 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2477 qc->flags = ctrl->flags;
2478 qc->type = ctrl->type;
2479 if (ctrl->is_ptr)
2480 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2481 qc->elem_size = ctrl->elem_size;
2482 qc->elems = ctrl->elems;
2483 qc->nr_of_dims = ctrl->nr_of_dims;
2484 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2485 qc->minimum = ctrl->minimum;
2486 qc->maximum = ctrl->maximum;
2487 qc->default_value = ctrl->default_value;
2488 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2489 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2490 qc->step = 1;
2491 else
2492 qc->step = ctrl->step;
2493 return 0;
2494 }
2495 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2496
2497 /* Implement VIDIOC_QUERYCTRL */
2498 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2499 {
2500 struct v4l2_query_ext_ctrl qec = { qc->id };
2501 int rc;
2502
2503 rc = v4l2_query_ext_ctrl(hdl, &qec);
2504 if (rc)
2505 return rc;
2506
2507 qc->id = qec.id;
2508 qc->type = qec.type;
2509 qc->flags = qec.flags;
2510 strlcpy(qc->name, qec.name, sizeof(qc->name));
2511 switch (qc->type) {
2512 case V4L2_CTRL_TYPE_INTEGER:
2513 case V4L2_CTRL_TYPE_BOOLEAN:
2514 case V4L2_CTRL_TYPE_MENU:
2515 case V4L2_CTRL_TYPE_INTEGER_MENU:
2516 case V4L2_CTRL_TYPE_STRING:
2517 case V4L2_CTRL_TYPE_BITMASK:
2518 qc->minimum = qec.minimum;
2519 qc->maximum = qec.maximum;
2520 qc->step = qec.step;
2521 qc->default_value = qec.default_value;
2522 break;
2523 default:
2524 qc->minimum = 0;
2525 qc->maximum = 0;
2526 qc->step = 0;
2527 qc->default_value = 0;
2528 break;
2529 }
2530 return 0;
2531 }
2532 EXPORT_SYMBOL(v4l2_queryctrl);
2533
2534 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2535 {
2536 if (qc->id & (V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND))
2537 return -EINVAL;
2538 return v4l2_queryctrl(sd->ctrl_handler, qc);
2539 }
2540 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2541
2542 /* Implement VIDIOC_QUERYMENU */
2543 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2544 {
2545 struct v4l2_ctrl *ctrl;
2546 u32 i = qm->index;
2547
2548 ctrl = v4l2_ctrl_find(hdl, qm->id);
2549 if (!ctrl)
2550 return -EINVAL;
2551
2552 qm->reserved = 0;
2553 /* Sanity checks */
2554 switch (ctrl->type) {
2555 case V4L2_CTRL_TYPE_MENU:
2556 if (ctrl->qmenu == NULL)
2557 return -EINVAL;
2558 break;
2559 case V4L2_CTRL_TYPE_INTEGER_MENU:
2560 if (ctrl->qmenu_int == NULL)
2561 return -EINVAL;
2562 break;
2563 default:
2564 return -EINVAL;
2565 }
2566
2567 if (i < ctrl->minimum || i > ctrl->maximum)
2568 return -EINVAL;
2569
2570 /* Use mask to see if this menu item should be skipped */
2571 if (ctrl->menu_skip_mask & (1 << i))
2572 return -EINVAL;
2573 /* Empty menu items should also be skipped */
2574 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2575 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2576 return -EINVAL;
2577 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2578 } else {
2579 qm->value = ctrl->qmenu_int[i];
2580 }
2581 return 0;
2582 }
2583 EXPORT_SYMBOL(v4l2_querymenu);
2584
2585 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2586 {
2587 return v4l2_querymenu(sd->ctrl_handler, qm);
2588 }
2589 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2590
2591
2592
2593 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2594
2595 It is not a fully atomic operation, just best-effort only. After all, if
2596 multiple controls have to be set through multiple i2c writes (for example)
2597 then some initial writes may succeed while others fail. Thus leaving the
2598 system in an inconsistent state. The question is how much effort you are
2599 willing to spend on trying to make something atomic that really isn't.
2600
2601 From the point of view of an application the main requirement is that
2602 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2603 error should be returned without actually affecting any controls.
2604
2605 If all the values are correct, then it is acceptable to just give up
2606 in case of low-level errors.
2607
2608 It is important though that the application can tell when only a partial
2609 configuration was done. The way we do that is through the error_idx field
2610 of struct v4l2_ext_controls: if that is equal to the count field then no
2611 controls were affected. Otherwise all controls before that index were
2612 successful in performing their 'get' or 'set' operation, the control at
2613 the given index failed, and you don't know what happened with the controls
2614 after the failed one. Since if they were part of a control cluster they
2615 could have been successfully processed (if a cluster member was encountered
2616 at index < error_idx), they could have failed (if a cluster member was at
2617 error_idx), or they may not have been processed yet (if the first cluster
2618 member appeared after error_idx).
2619
2620 It is all fairly theoretical, though. In practice all you can do is to
2621 bail out. If error_idx == count, then it is an application bug. If
2622 error_idx < count then it is only an application bug if the error code was
2623 EBUSY. That usually means that something started streaming just when you
2624 tried to set the controls. In all other cases it is a driver/hardware
2625 problem and all you can do is to retry or bail out.
2626
2627 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2628 never modifies controls the error_idx is just set to whatever control
2629 has an invalid value.
2630 */
2631
2632 /* Prepare for the extended g/s/try functions.
2633 Find the controls in the control array and do some basic checks. */
2634 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2635 struct v4l2_ext_controls *cs,
2636 struct v4l2_ctrl_helper *helpers,
2637 bool get)
2638 {
2639 struct v4l2_ctrl_helper *h;
2640 bool have_clusters = false;
2641 u32 i;
2642
2643 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2644 struct v4l2_ext_control *c = &cs->controls[i];
2645 struct v4l2_ctrl_ref *ref;
2646 struct v4l2_ctrl *ctrl;
2647 u32 id = c->id & V4L2_CTRL_ID_MASK;
2648
2649 cs->error_idx = i;
2650
2651 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2652 return -EINVAL;
2653
2654 /* Old-style private controls are not allowed for
2655 extended controls */
2656 if (id >= V4L2_CID_PRIVATE_BASE)
2657 return -EINVAL;
2658 ref = find_ref_lock(hdl, id);
2659 if (ref == NULL)
2660 return -EINVAL;
2661 ctrl = ref->ctrl;
2662 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2663 return -EINVAL;
2664
2665 if (ctrl->cluster[0]->ncontrols > 1)
2666 have_clusters = true;
2667 if (ctrl->cluster[0] != ctrl)
2668 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2669 if (ctrl->is_ptr && !ctrl->is_string) {
2670 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2671
2672 if (c->size < tot_size) {
2673 if (get) {
2674 c->size = tot_size;
2675 return -ENOSPC;
2676 }
2677 return -EFAULT;
2678 }
2679 c->size = tot_size;
2680 }
2681 /* Store the ref to the master control of the cluster */
2682 h->mref = ref;
2683 h->ctrl = ctrl;
2684 /* Initially set next to 0, meaning that there is no other
2685 control in this helper array belonging to the same
2686 cluster */
2687 h->next = 0;
2688 }
2689
2690 /* We are done if there were no controls that belong to a multi-
2691 control cluster. */
2692 if (!have_clusters)
2693 return 0;
2694
2695 /* The code below figures out in O(n) time which controls in the list
2696 belong to the same cluster. */
2697
2698 /* This has to be done with the handler lock taken. */
2699 mutex_lock(hdl->lock);
2700
2701 /* First zero the helper field in the master control references */
2702 for (i = 0; i < cs->count; i++)
2703 helpers[i].mref->helper = NULL;
2704 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2705 struct v4l2_ctrl_ref *mref = h->mref;
2706
2707 /* If the mref->helper is set, then it points to an earlier
2708 helper that belongs to the same cluster. */
2709 if (mref->helper) {
2710 /* Set the next field of mref->helper to the current
2711 index: this means that that earlier helper now
2712 points to the next helper in the same cluster. */
2713 mref->helper->next = i;
2714 /* mref should be set only for the first helper in the
2715 cluster, clear the others. */
2716 h->mref = NULL;
2717 }
2718 /* Point the mref helper to the current helper struct. */
2719 mref->helper = h;
2720 }
2721 mutex_unlock(hdl->lock);
2722 return 0;
2723 }
2724
2725 /* Handles the corner case where cs->count == 0. It checks whether the
2726 specified control class exists. If that class ID is 0, then it checks
2727 whether there are any controls at all. */
2728 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2729 {
2730 if (ctrl_class == 0)
2731 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2732 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2733 }
2734
2735
2736
2737 /* Get extended controls. Allocates the helpers array if needed. */
2738 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2739 {
2740 struct v4l2_ctrl_helper helper[4];
2741 struct v4l2_ctrl_helper *helpers = helper;
2742 int ret;
2743 int i, j;
2744
2745 cs->error_idx = cs->count;
2746 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2747
2748 if (hdl == NULL)
2749 return -EINVAL;
2750
2751 if (cs->count == 0)
2752 return class_check(hdl, cs->ctrl_class);
2753
2754 if (cs->count > ARRAY_SIZE(helper)) {
2755 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2756 GFP_KERNEL);
2757 if (helpers == NULL)
2758 return -ENOMEM;
2759 }
2760
2761 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2762 cs->error_idx = cs->count;
2763
2764 for (i = 0; !ret && i < cs->count; i++)
2765 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2766 ret = -EACCES;
2767
2768 for (i = 0; !ret && i < cs->count; i++) {
2769 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2770 struct v4l2_ctrl *ctrl) = cur_to_user;
2771 struct v4l2_ctrl *master;
2772
2773 if (helpers[i].mref == NULL)
2774 continue;
2775
2776 master = helpers[i].mref->ctrl;
2777 cs->error_idx = i;
2778
2779 v4l2_ctrl_lock(master);
2780
2781 /* g_volatile_ctrl will update the new control values */
2782 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2783 (master->has_volatiles && !is_cur_manual(master))) {
2784 for (j = 0; j < master->ncontrols; j++)
2785 cur_to_new(master->cluster[j]);
2786 ret = call_op(master, g_volatile_ctrl);
2787 ctrl_to_user = new_to_user;
2788 }
2789 /* If OK, then copy the current (for non-volatile controls)
2790 or the new (for volatile controls) control values to the
2791 caller */
2792 if (!ret) {
2793 u32 idx = i;
2794
2795 do {
2796 ret = ctrl_to_user(cs->controls + idx,
2797 helpers[idx].ctrl);
2798 idx = helpers[idx].next;
2799 } while (!ret && idx);
2800 }
2801 v4l2_ctrl_unlock(master);
2802 }
2803
2804 if (cs->count > ARRAY_SIZE(helper))
2805 kfree(helpers);
2806 return ret;
2807 }
2808 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2809
2810 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2811 {
2812 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2813 }
2814 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2815
2816 /* Helper function to get a single control */
2817 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2818 {
2819 struct v4l2_ctrl *master = ctrl->cluster[0];
2820 int ret = 0;
2821 int i;
2822
2823 /* Compound controls are not supported. The new_to_user() and
2824 * cur_to_user() calls below would need to be modified not to access
2825 * userspace memory when called from get_ctrl().
2826 */
2827 if (!ctrl->is_int)
2828 return -EINVAL;
2829
2830 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2831 return -EACCES;
2832
2833 v4l2_ctrl_lock(master);
2834 /* g_volatile_ctrl will update the current control values */
2835 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2836 for (i = 0; i < master->ncontrols; i++)
2837 cur_to_new(master->cluster[i]);
2838 ret = call_op(master, g_volatile_ctrl);
2839 new_to_user(c, ctrl);
2840 } else {
2841 cur_to_user(c, ctrl);
2842 }
2843 v4l2_ctrl_unlock(master);
2844 return ret;
2845 }
2846
2847 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2848 {
2849 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2850 struct v4l2_ext_control c;
2851 int ret;
2852
2853 if (ctrl == NULL || !ctrl->is_int)
2854 return -EINVAL;
2855 ret = get_ctrl(ctrl, &c);
2856 control->value = c.value;
2857 return ret;
2858 }
2859 EXPORT_SYMBOL(v4l2_g_ctrl);
2860
2861 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2862 {
2863 return v4l2_g_ctrl(sd->ctrl_handler, control);
2864 }
2865 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2866
2867 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2868 {
2869 struct v4l2_ext_control c;
2870
2871 /* It's a driver bug if this happens. */
2872 WARN_ON(!ctrl->is_int);
2873 c.value = 0;
2874 get_ctrl(ctrl, &c);
2875 return c.value;
2876 }
2877 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2878
2879 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2880 {
2881 struct v4l2_ext_control c;
2882
2883 /* It's a driver bug if this happens. */
2884 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2885 c.value = 0;
2886 get_ctrl(ctrl, &c);
2887 return c.value;
2888 }
2889 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2890
2891
2892 /* Core function that calls try/s_ctrl and ensures that the new value is
2893 copied to the current value on a set.
2894 Must be called with ctrl->handler->lock held. */
2895 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2896 bool set, u32 ch_flags)
2897 {
2898 bool update_flag;
2899 int ret;
2900 int i;
2901
2902 /* Go through the cluster and either validate the new value or
2903 (if no new value was set), copy the current value to the new
2904 value, ensuring a consistent view for the control ops when
2905 called. */
2906 for (i = 0; i < master->ncontrols; i++) {
2907 struct v4l2_ctrl *ctrl = master->cluster[i];
2908
2909 if (ctrl == NULL)
2910 continue;
2911
2912 if (!ctrl->is_new) {
2913 cur_to_new(ctrl);
2914 continue;
2915 }
2916 /* Check again: it may have changed since the
2917 previous check in try_or_set_ext_ctrls(). */
2918 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2919 return -EBUSY;
2920 }
2921
2922 ret = call_op(master, try_ctrl);
2923
2924 /* Don't set if there is no change */
2925 if (ret || !set || !cluster_changed(master))
2926 return ret;
2927 ret = call_op(master, s_ctrl);
2928 if (ret)
2929 return ret;
2930
2931 /* If OK, then make the new values permanent. */
2932 update_flag = is_cur_manual(master) != is_new_manual(master);
2933 for (i = 0; i < master->ncontrols; i++)
2934 new_to_cur(fh, master->cluster[i], ch_flags |
2935 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2936 return 0;
2937 }
2938
2939 /* Validate controls. */
2940 static int validate_ctrls(struct v4l2_ext_controls *cs,
2941 struct v4l2_ctrl_helper *helpers, bool set)
2942 {
2943 unsigned i;
2944 int ret = 0;
2945
2946 cs->error_idx = cs->count;
2947 for (i = 0; i < cs->count; i++) {
2948 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2949
2950 cs->error_idx = i;
2951
2952 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2953 return -EACCES;
2954 /* This test is also done in try_set_control_cluster() which
2955 is called in atomic context, so that has the final say,
2956 but it makes sense to do an up-front check as well. Once
2957 an error occurs in try_set_control_cluster() some other
2958 controls may have been set already and we want to do a
2959 best-effort to avoid that. */
2960 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2961 return -EBUSY;
2962 ret = validate_new(ctrl, &cs->controls[i]);
2963 if (ret)
2964 return ret;
2965 }
2966 return 0;
2967 }
2968
2969 /* Obtain the current volatile values of an autocluster and mark them
2970 as new. */
2971 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2972 {
2973 int i;
2974
2975 for (i = 0; i < master->ncontrols; i++)
2976 cur_to_new(master->cluster[i]);
2977 if (!call_op(master, g_volatile_ctrl))
2978 for (i = 1; i < master->ncontrols; i++)
2979 if (master->cluster[i])
2980 master->cluster[i]->is_new = 1;
2981 }
2982
2983 /* Try or try-and-set controls */
2984 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2985 struct v4l2_ext_controls *cs,
2986 bool set)
2987 {
2988 struct v4l2_ctrl_helper helper[4];
2989 struct v4l2_ctrl_helper *helpers = helper;
2990 unsigned i, j;
2991 int ret;
2992
2993 cs->error_idx = cs->count;
2994 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2995
2996 if (hdl == NULL)
2997 return -EINVAL;
2998
2999 if (cs->count == 0)
3000 return class_check(hdl, cs->ctrl_class);
3001
3002 if (cs->count > ARRAY_SIZE(helper)) {
3003 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3004 GFP_KERNEL);
3005 if (!helpers)
3006 return -ENOMEM;
3007 }
3008 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3009 if (!ret)
3010 ret = validate_ctrls(cs, helpers, set);
3011 if (ret && set)
3012 cs->error_idx = cs->count;
3013 for (i = 0; !ret && i < cs->count; i++) {
3014 struct v4l2_ctrl *master;
3015 u32 idx = i;
3016
3017 if (helpers[i].mref == NULL)
3018 continue;
3019
3020 cs->error_idx = i;
3021 master = helpers[i].mref->ctrl;
3022 v4l2_ctrl_lock(master);
3023
3024 /* Reset the 'is_new' flags of the cluster */
3025 for (j = 0; j < master->ncontrols; j++)
3026 if (master->cluster[j])
3027 master->cluster[j]->is_new = 0;
3028
3029 /* For volatile autoclusters that are currently in auto mode
3030 we need to discover if it will be set to manual mode.
3031 If so, then we have to copy the current volatile values
3032 first since those will become the new manual values (which
3033 may be overwritten by explicit new values from this set
3034 of controls). */
3035 if (master->is_auto && master->has_volatiles &&
3036 !is_cur_manual(master)) {
3037 /* Pick an initial non-manual value */
3038 s32 new_auto_val = master->manual_mode_value + 1;
3039 u32 tmp_idx = idx;
3040
3041 do {
3042 /* Check if the auto control is part of the
3043 list, and remember the new value. */
3044 if (helpers[tmp_idx].ctrl == master)
3045 new_auto_val = cs->controls[tmp_idx].value;
3046 tmp_idx = helpers[tmp_idx].next;
3047 } while (tmp_idx);
3048 /* If the new value == the manual value, then copy
3049 the current volatile values. */
3050 if (new_auto_val == master->manual_mode_value)
3051 update_from_auto_cluster(master);
3052 }
3053
3054 /* Copy the new caller-supplied control values.
3055 user_to_new() sets 'is_new' to 1. */
3056 do {
3057 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
3058 idx = helpers[idx].next;
3059 } while (!ret && idx);
3060
3061 if (!ret)
3062 ret = try_or_set_cluster(fh, master, set, 0);
3063
3064 /* Copy the new values back to userspace. */
3065 if (!ret) {
3066 idx = i;
3067 do {
3068 ret = new_to_user(cs->controls + idx,
3069 helpers[idx].ctrl);
3070 idx = helpers[idx].next;
3071 } while (!ret && idx);
3072 }
3073 v4l2_ctrl_unlock(master);
3074 }
3075
3076 if (cs->count > ARRAY_SIZE(helper))
3077 kfree(helpers);
3078 return ret;
3079 }
3080
3081 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3082 {
3083 return try_set_ext_ctrls(NULL, hdl, cs, false);
3084 }
3085 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3086
3087 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3088 struct v4l2_ext_controls *cs)
3089 {
3090 return try_set_ext_ctrls(fh, hdl, cs, true);
3091 }
3092 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3093
3094 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3095 {
3096 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
3097 }
3098 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
3099
3100 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3101 {
3102 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
3103 }
3104 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
3105
3106 /* Helper function for VIDIOC_S_CTRL compatibility */
3107 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3108 struct v4l2_ext_control *c, u32 ch_flags)
3109 {
3110 struct v4l2_ctrl *master = ctrl->cluster[0];
3111 int i;
3112
3113 /* Compound controls are not supported. The user_to_new() and
3114 * cur_to_user() calls below would need to be modified not to access
3115 * userspace memory when called from set_ctrl().
3116 */
3117 if (ctrl->is_ptr)
3118 return -EINVAL;
3119
3120 /* Reset the 'is_new' flags of the cluster */
3121 for (i = 0; i < master->ncontrols; i++)
3122 if (master->cluster[i])
3123 master->cluster[i]->is_new = 0;
3124
3125 /* For autoclusters with volatiles that are switched from auto to
3126 manual mode we have to update the current volatile values since
3127 those will become the initial manual values after such a switch. */
3128 if (master->is_auto && master->has_volatiles && ctrl == master &&
3129 !is_cur_manual(master) && c->value == master->manual_mode_value)
3130 update_from_auto_cluster(master);
3131
3132 user_to_new(c, ctrl);
3133 return try_or_set_cluster(fh, master, true, ch_flags);
3134 }
3135
3136 /* Helper function for VIDIOC_S_CTRL compatibility */
3137 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3138 struct v4l2_ext_control *c)
3139 {
3140 int ret = validate_new(ctrl, c);
3141
3142 if (!ret) {
3143 v4l2_ctrl_lock(ctrl);
3144 ret = set_ctrl(fh, ctrl, c, 0);
3145 if (!ret)
3146 cur_to_user(c, ctrl);
3147 v4l2_ctrl_unlock(ctrl);
3148 }
3149 return ret;
3150 }
3151
3152 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3153 struct v4l2_control *control)
3154 {
3155 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3156 struct v4l2_ext_control c;
3157 int ret;
3158
3159 if (ctrl == NULL || !ctrl->is_int)
3160 return -EINVAL;
3161
3162 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3163 return -EACCES;
3164
3165 c.value = control->value;
3166 ret = set_ctrl_lock(fh, ctrl, &c);
3167 control->value = c.value;
3168 return ret;
3169 }
3170 EXPORT_SYMBOL(v4l2_s_ctrl);
3171
3172 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
3173 {
3174 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
3175 }
3176 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
3177
3178 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3179 {
3180 struct v4l2_ext_control c;
3181
3182 /* It's a driver bug if this happens. */
3183 WARN_ON(!ctrl->is_int);
3184 c.value = val;
3185 return set_ctrl_lock(NULL, ctrl, &c);
3186 }
3187 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
3188
3189 int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3190 {
3191 struct v4l2_ext_control c;
3192
3193 /* It's a driver bug if this happens. */
3194 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3195 c.value64 = val;
3196 return set_ctrl_lock(NULL, ctrl, &c);
3197 }
3198 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
3199
3200 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3201 {
3202 if (ctrl == NULL)
3203 return;
3204 if (notify == NULL) {
3205 ctrl->call_notify = 0;
3206 return;
3207 }
3208 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3209 return;
3210 ctrl->handler->notify = notify;
3211 ctrl->handler->notify_priv = priv;
3212 ctrl->call_notify = 1;
3213 }
3214 EXPORT_SYMBOL(v4l2_ctrl_notify);
3215
3216 int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3217 s64 min, s64 max, u64 step, s64 def)
3218 {
3219 int ret;
3220 struct v4l2_ext_control c;
3221
3222 switch (ctrl->type) {
3223 case V4L2_CTRL_TYPE_INTEGER:
3224 case V4L2_CTRL_TYPE_INTEGER64:
3225 case V4L2_CTRL_TYPE_BOOLEAN:
3226 case V4L2_CTRL_TYPE_MENU:
3227 case V4L2_CTRL_TYPE_INTEGER_MENU:
3228 case V4L2_CTRL_TYPE_BITMASK:
3229 case V4L2_CTRL_TYPE_U8:
3230 case V4L2_CTRL_TYPE_U16:
3231 if (ctrl->is_array)
3232 return -EINVAL;
3233 ret = check_range(ctrl->type, min, max, step, def);
3234 if (ret)
3235 return ret;
3236 break;
3237 default:
3238 return -EINVAL;
3239 }
3240 v4l2_ctrl_lock(ctrl);
3241 ctrl->minimum = min;
3242 ctrl->maximum = max;
3243 ctrl->step = step;
3244 ctrl->default_value = def;
3245 c.value = *ctrl->p_cur.p_s32;
3246 if (validate_new(ctrl, &c))
3247 c.value = def;
3248 if (c.value != *ctrl->p_cur.p_s32)
3249 ret = set_ctrl(NULL, ctrl, &c, V4L2_EVENT_CTRL_CH_RANGE);
3250 else
3251 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3252 v4l2_ctrl_unlock(ctrl);
3253 return ret;
3254 }
3255 EXPORT_SYMBOL(v4l2_ctrl_modify_range);
3256
3257 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3258 {
3259 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3260
3261 if (ctrl == NULL)
3262 return -EINVAL;
3263
3264 v4l2_ctrl_lock(ctrl);
3265 list_add_tail(&sev->node, &ctrl->ev_subs);
3266 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3267 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3268 struct v4l2_event ev;
3269 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3270
3271 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3272 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3273 fill_event(&ev, ctrl, changes);
3274 /* Mark the queue as active, allowing this initial
3275 event to be accepted. */
3276 sev->elems = elems;
3277 v4l2_event_queue_fh(sev->fh, &ev);
3278 }
3279 v4l2_ctrl_unlock(ctrl);
3280 return 0;
3281 }
3282
3283 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3284 {
3285 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3286
3287 v4l2_ctrl_lock(ctrl);
3288 list_del(&sev->node);
3289 v4l2_ctrl_unlock(ctrl);
3290 }
3291
3292 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3293 {
3294 u32 old_changes = old->u.ctrl.changes;
3295
3296 old->u.ctrl = new->u.ctrl;
3297 old->u.ctrl.changes |= old_changes;
3298 }
3299 EXPORT_SYMBOL(v4l2_ctrl_replace);
3300
3301 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3302 {
3303 new->u.ctrl.changes |= old->u.ctrl.changes;
3304 }
3305 EXPORT_SYMBOL(v4l2_ctrl_merge);
3306
3307 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3308 .add = v4l2_ctrl_add_event,
3309 .del = v4l2_ctrl_del_event,
3310 .replace = v4l2_ctrl_replace,
3311 .merge = v4l2_ctrl_merge,
3312 };
3313 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3314
3315 int v4l2_ctrl_log_status(struct file *file, void *fh)
3316 {
3317 struct video_device *vfd = video_devdata(file);
3318 struct v4l2_fh *vfh = file->private_data;
3319
3320 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3321 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3322 vfd->v4l2_dev->name);
3323 return 0;
3324 }
3325 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3326
3327 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3328 const struct v4l2_event_subscription *sub)
3329 {
3330 if (sub->type == V4L2_EVENT_CTRL)
3331 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3332 return -EINVAL;
3333 }
3334 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3335
3336 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3337 struct v4l2_event_subscription *sub)
3338 {
3339 if (!sd->ctrl_handler)
3340 return -EINVAL;
3341 return v4l2_ctrl_subscribe_event(fh, sub);
3342 }
3343 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3344
3345 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3346 {
3347 struct v4l2_fh *fh = file->private_data;
3348
3349 if (v4l2_event_pending(fh))
3350 return POLLPRI;
3351 poll_wait(file, &fh->wait, wait);
3352 return 0;
3353 }
3354 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux kernel - Deliverables
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