2 V4L2 controls framework implementation.
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
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.
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.
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
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>
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)
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. */
46 /* Small helper function to determine if the autocluster is set to manual
48 static bool is_cur_manual(const struct v4l2_ctrl *master)
50 return master->is_auto && master->cur.val == master->manual_mode_value;
53 /* Same as above, but this checks the against the new value instead of the
55 static bool is_new_manual(const struct v4l2_ctrl *master)
57 return master->is_auto && master->val == master->manual_mode_value;
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)
66 static const char * const mpeg_audio_sampling_freq[] = {
72 static const char * const mpeg_audio_encoding[] = {
80 static const char * const mpeg_audio_l1_bitrate[] = {
97 static const char * const mpeg_audio_l2_bitrate[] = {
114 static const char * const mpeg_audio_l3_bitrate[] = {
131 static const char * const mpeg_audio_ac3_bitrate[] = {
153 static const char * const mpeg_audio_mode[] = {
160 static const char * const mpeg_audio_mode_extension[] = {
167 static const char * const mpeg_audio_emphasis[] = {
173 static const char * const mpeg_audio_crc[] = {
178 static const char * const mpeg_audio_dec_playback[] = {
187 static const char * const mpeg_video_encoding[] = {
193 static const char * const mpeg_video_aspect[] = {
200 static const char * const mpeg_video_bitrate_mode[] = {
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",
214 static const char * const mpeg_stream_vbi_fmt[] = {
216 "Private Packet, IVTV Format",
219 static const char * const camera_power_line_frequency[] = {
226 static const char * const camera_exposure_auto[] = {
229 "Shutter Priority Mode",
230 "Aperture Priority Mode",
233 static const char * const camera_exposure_metering[] = {
240 static const char * const camera_auto_focus_range[] = {
247 static const char * const colorfx[] = {
266 static const char * const auto_n_preset_white_balance[] = {
279 static const char * const camera_iso_sensitivity_auto[] = {
284 static const char * const scene_mode[] = {
301 static const char * const tune_emphasis[] = {
307 static const char * const header_mode[] = {
309 "Joined With 1st Frame",
312 static const char * const multi_slice[] = {
318 static const char * const entropy_mode[] = {
323 static const char * const mpeg_h264_level[] = {
342 static const char * const h264_loop_filter[] = {
345 "Disabled at Slice Boundary",
348 static const char * const h264_profile[] = {
350 "Constrained Baseline",
356 "High 444 Predictive",
363 "Scalable High Intra",
367 static const char * const vui_sar_idc[] = {
388 static const char * const h264_fp_arrangement_type[] = {
397 static const char * const h264_fmo_map_type[] = {
398 "Interleaved Slices",
400 "Foreground with Leftover",
407 static const char * const mpeg_mpeg4_level[] = {
418 static const char * const mpeg4_profile[] = {
423 "Advanced Coding Efficiency",
427 static const char * const vpx_golden_frame_sel[] = {
428 "Use Previous Frame",
429 "Use Previous Specific Frame",
433 static const char * const flash_led_mode[] = {
439 static const char * const flash_strobe_source[] = {
445 static const char * const jpeg_chroma_subsampling[] = {
454 static const char * const dv_tx_mode[] = {
459 static const char * const dv_rgb_range[] = {
461 "RGB limited range (16-235)",
462 "RGB full range (0-255)",
465 static const char * const detect_md_mode[] = {
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:
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:
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:
534 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
536 case V4L2_CID_MPEG_VIDEO_H264_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:
544 case V4L2_CID_MPEG_VIDEO_H264_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:
560 case V4L2_CID_DV_TX_RGB_RANGE:
561 case V4L2_CID_DV_RX_RGB_RANGE:
563 case V4L2_CID_DETECT_MD_MODE:
564 return detect_md_mode;
570 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
572 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
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.
577 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
579 static const s64 qmenu_int_vpx_num_partitions[] = {
583 static const s64 qmenu_int_vpx_num_ref_frames[] = {
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);
597 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
599 /* Return the control name. */
600 const char *v4l2_ctrl_get_name(u32 id)
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";
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";
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";
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";
800 /* FM Radio Modulator controls */
801 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
802 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
803 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
804 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
805 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
806 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
807 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
808 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
809 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
810 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
811 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
812 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
813 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
814 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
815 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
816 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
817 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
818 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
819 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
820 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
821 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
822 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
823 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
824 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
825 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
826 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
827 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
828 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
829 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
830 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
833 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
834 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
835 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
836 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
837 case V4L2_CID_FLASH_STROBE: return "Strobe";
838 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
839 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
840 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
841 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
842 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
843 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
844 case V4L2_CID_FLASH_FAULT: return "Faults";
845 case V4L2_CID_FLASH_CHARGE: return "Charge";
846 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
848 /* JPEG encoder controls */
849 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
850 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
851 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
852 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
853 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
854 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
856 /* Image source controls */
857 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
858 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
859 case V4L2_CID_VBLANK: return "Vertical Blanking";
860 case V4L2_CID_HBLANK: return "Horizontal Blanking";
861 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
863 /* Image processing controls */
864 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
865 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
866 case V4L2_CID_LINK_FREQ: return "Link Frequency";
867 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
868 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
871 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
872 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
873 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
874 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
875 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
876 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
877 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
878 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
879 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
881 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
882 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
883 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
884 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
885 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
886 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
887 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
888 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
889 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
890 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
891 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
892 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
893 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
894 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
895 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
896 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
897 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
898 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
899 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
901 /* Detection controls */
902 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
903 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
904 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
905 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
906 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
907 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
912 EXPORT_SYMBOL(v4l2_ctrl_get_name);
914 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
915 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
917 *name = v4l2_ctrl_get_name(id);
921 case V4L2_CID_AUDIO_MUTE:
922 case V4L2_CID_AUDIO_LOUDNESS:
923 case V4L2_CID_AUTO_WHITE_BALANCE:
924 case V4L2_CID_AUTOGAIN:
927 case V4L2_CID_HUE_AUTO:
928 case V4L2_CID_CHROMA_AGC:
929 case V4L2_CID_COLOR_KILLER:
930 case V4L2_CID_AUTOBRIGHTNESS:
931 case V4L2_CID_MPEG_AUDIO_MUTE:
932 case V4L2_CID_MPEG_VIDEO_MUTE:
933 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
934 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
935 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
936 case V4L2_CID_FOCUS_AUTO:
937 case V4L2_CID_PRIVACY:
938 case V4L2_CID_AUDIO_LIMITER_ENABLED:
939 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
940 case V4L2_CID_PILOT_TONE_ENABLED:
941 case V4L2_CID_ILLUMINATORS_1:
942 case V4L2_CID_ILLUMINATORS_2:
943 case V4L2_CID_FLASH_STROBE_STATUS:
944 case V4L2_CID_FLASH_CHARGE:
945 case V4L2_CID_FLASH_READY:
946 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
947 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
948 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
949 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
950 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
951 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
952 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
953 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
954 case V4L2_CID_WIDE_DYNAMIC_RANGE:
955 case V4L2_CID_IMAGE_STABILIZATION:
956 case V4L2_CID_RDS_RECEPTION:
957 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
958 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
959 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
960 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
961 case V4L2_CID_RF_TUNER_PLL_LOCK:
962 case V4L2_CID_RDS_TX_MONO_STEREO:
963 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
964 case V4L2_CID_RDS_TX_COMPRESSED:
965 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
966 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
967 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
968 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
969 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
970 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
971 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
972 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
973 *type = V4L2_CTRL_TYPE_BOOLEAN;
977 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
978 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
979 *type = V4L2_CTRL_TYPE_INTEGER;
981 case V4L2_CID_PAN_RESET:
982 case V4L2_CID_TILT_RESET:
983 case V4L2_CID_FLASH_STROBE:
984 case V4L2_CID_FLASH_STROBE_STOP:
985 case V4L2_CID_AUTO_FOCUS_START:
986 case V4L2_CID_AUTO_FOCUS_STOP:
987 *type = V4L2_CTRL_TYPE_BUTTON;
988 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
989 *min = *max = *step = *def = 0;
991 case V4L2_CID_POWER_LINE_FREQUENCY:
992 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
993 case V4L2_CID_MPEG_AUDIO_ENCODING:
994 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
995 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
996 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
997 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
998 case V4L2_CID_MPEG_AUDIO_MODE:
999 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1000 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1001 case V4L2_CID_MPEG_AUDIO_CRC:
1002 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1003 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1004 case V4L2_CID_MPEG_VIDEO_ENCODING:
1005 case V4L2_CID_MPEG_VIDEO_ASPECT:
1006 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1007 case V4L2_CID_MPEG_STREAM_TYPE:
1008 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1009 case V4L2_CID_EXPOSURE_AUTO:
1010 case V4L2_CID_AUTO_FOCUS_RANGE:
1011 case V4L2_CID_COLORFX:
1012 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1013 case V4L2_CID_TUNE_PREEMPHASIS:
1014 case V4L2_CID_FLASH_LED_MODE:
1015 case V4L2_CID_FLASH_STROBE_SOURCE:
1016 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1017 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1018 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1019 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1020 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1021 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1022 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1023 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1024 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1025 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1026 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1027 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1028 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1029 case V4L2_CID_EXPOSURE_METERING:
1030 case V4L2_CID_SCENE_MODE:
1031 case V4L2_CID_DV_TX_MODE:
1032 case V4L2_CID_DV_TX_RGB_RANGE:
1033 case V4L2_CID_DV_RX_RGB_RANGE:
1034 case V4L2_CID_TEST_PATTERN:
1035 case V4L2_CID_TUNE_DEEMPHASIS:
1036 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1037 case V4L2_CID_DETECT_MD_MODE:
1038 *type = V4L2_CTRL_TYPE_MENU;
1040 case V4L2_CID_LINK_FREQ:
1041 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1043 case V4L2_CID_RDS_TX_PS_NAME:
1044 case V4L2_CID_RDS_TX_RADIO_TEXT:
1045 case V4L2_CID_RDS_RX_PS_NAME:
1046 case V4L2_CID_RDS_RX_RADIO_TEXT:
1047 *type = V4L2_CTRL_TYPE_STRING;
1049 case V4L2_CID_ISO_SENSITIVITY:
1050 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1051 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1052 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1053 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1055 case V4L2_CID_USER_CLASS:
1056 case V4L2_CID_CAMERA_CLASS:
1057 case V4L2_CID_MPEG_CLASS:
1058 case V4L2_CID_FM_TX_CLASS:
1059 case V4L2_CID_FLASH_CLASS:
1060 case V4L2_CID_JPEG_CLASS:
1061 case V4L2_CID_IMAGE_SOURCE_CLASS:
1062 case V4L2_CID_IMAGE_PROC_CLASS:
1063 case V4L2_CID_DV_CLASS:
1064 case V4L2_CID_FM_RX_CLASS:
1065 case V4L2_CID_RF_TUNER_CLASS:
1066 case V4L2_CID_DETECT_CLASS:
1067 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1068 /* You can neither read not write these */
1069 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1070 *min = *max = *step = *def = 0;
1072 case V4L2_CID_BG_COLOR:
1073 *type = V4L2_CTRL_TYPE_INTEGER;
1076 /* Max is calculated as RGB888 that is 2^24 */
1079 case V4L2_CID_FLASH_FAULT:
1080 case V4L2_CID_JPEG_ACTIVE_MARKER:
1081 case V4L2_CID_3A_LOCK:
1082 case V4L2_CID_AUTO_FOCUS_STATUS:
1083 case V4L2_CID_DV_TX_HOTPLUG:
1084 case V4L2_CID_DV_TX_RXSENSE:
1085 case V4L2_CID_DV_TX_EDID_PRESENT:
1086 case V4L2_CID_DV_RX_POWER_PRESENT:
1087 *type = V4L2_CTRL_TYPE_BITMASK;
1089 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1090 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1091 *type = V4L2_CTRL_TYPE_INTEGER;
1092 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1094 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1095 *type = V4L2_CTRL_TYPE_INTEGER64;
1096 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1098 *max = 0x1ffffffffLL;
1101 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1102 *type = V4L2_CTRL_TYPE_INTEGER64;
1103 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1105 *max = 0x7fffffffffffffffLL;
1108 case V4L2_CID_PIXEL_RATE:
1109 *type = V4L2_CTRL_TYPE_INTEGER64;
1110 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1112 case V4L2_CID_DETECT_MD_REGION_GRID:
1113 *type = V4L2_CTRL_TYPE_U8;
1115 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1116 *type = V4L2_CTRL_TYPE_U16;
1118 case V4L2_CID_RDS_TX_ALT_FREQS:
1119 *type = V4L2_CTRL_TYPE_U32;
1122 *type = V4L2_CTRL_TYPE_INTEGER;
1126 case V4L2_CID_MPEG_AUDIO_ENCODING:
1127 case V4L2_CID_MPEG_AUDIO_MODE:
1128 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1129 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1130 case V4L2_CID_MPEG_STREAM_TYPE:
1131 *flags |= V4L2_CTRL_FLAG_UPDATE;
1133 case V4L2_CID_AUDIO_VOLUME:
1134 case V4L2_CID_AUDIO_BALANCE:
1135 case V4L2_CID_AUDIO_BASS:
1136 case V4L2_CID_AUDIO_TREBLE:
1137 case V4L2_CID_BRIGHTNESS:
1138 case V4L2_CID_CONTRAST:
1139 case V4L2_CID_SATURATION:
1141 case V4L2_CID_RED_BALANCE:
1142 case V4L2_CID_BLUE_BALANCE:
1143 case V4L2_CID_GAMMA:
1144 case V4L2_CID_SHARPNESS:
1145 case V4L2_CID_CHROMA_GAIN:
1146 case V4L2_CID_RDS_TX_DEVIATION:
1147 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1148 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1149 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1150 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1151 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1152 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1153 case V4L2_CID_PILOT_TONE_DEVIATION:
1154 case V4L2_CID_PILOT_TONE_FREQUENCY:
1155 case V4L2_CID_TUNE_POWER_LEVEL:
1156 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1157 case V4L2_CID_RF_TUNER_LNA_GAIN:
1158 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1159 case V4L2_CID_RF_TUNER_IF_GAIN:
1160 case V4L2_CID_RF_TUNER_BANDWIDTH:
1161 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1162 *flags |= V4L2_CTRL_FLAG_SLIDER;
1164 case V4L2_CID_PAN_RELATIVE:
1165 case V4L2_CID_TILT_RELATIVE:
1166 case V4L2_CID_FOCUS_RELATIVE:
1167 case V4L2_CID_IRIS_RELATIVE:
1168 case V4L2_CID_ZOOM_RELATIVE:
1169 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1171 case V4L2_CID_FLASH_STROBE_STATUS:
1172 case V4L2_CID_AUTO_FOCUS_STATUS:
1173 case V4L2_CID_FLASH_READY:
1174 case V4L2_CID_DV_TX_HOTPLUG:
1175 case V4L2_CID_DV_TX_RXSENSE:
1176 case V4L2_CID_DV_TX_EDID_PRESENT:
1177 case V4L2_CID_DV_RX_POWER_PRESENT:
1178 case V4L2_CID_RDS_RX_PTY:
1179 case V4L2_CID_RDS_RX_PS_NAME:
1180 case V4L2_CID_RDS_RX_RADIO_TEXT:
1181 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1182 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1183 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1184 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1186 case V4L2_CID_RF_TUNER_PLL_LOCK:
1187 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1191 EXPORT_SYMBOL(v4l2_ctrl_fill);
1193 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1195 memset(ev->reserved, 0, sizeof(ev->reserved));
1196 ev->type = V4L2_EVENT_CTRL;
1198 ev->u.ctrl.changes = changes;
1199 ev->u.ctrl.type = ctrl->type;
1200 ev->u.ctrl.flags = ctrl->flags;
1202 ev->u.ctrl.value64 = 0;
1204 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1205 ev->u.ctrl.minimum = ctrl->minimum;
1206 ev->u.ctrl.maximum = ctrl->maximum;
1207 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1208 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1209 ev->u.ctrl.step = 1;
1211 ev->u.ctrl.step = ctrl->step;
1212 ev->u.ctrl.default_value = ctrl->default_value;
1215 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1217 struct v4l2_event ev;
1218 struct v4l2_subscribed_event *sev;
1220 if (list_empty(&ctrl->ev_subs))
1222 fill_event(&ev, ctrl, changes);
1224 list_for_each_entry(sev, &ctrl->ev_subs, node)
1225 if (sev->fh != fh ||
1226 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1227 v4l2_event_queue_fh(sev->fh, &ev);
1230 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1231 union v4l2_ctrl_ptr ptr1,
1232 union v4l2_ctrl_ptr ptr2)
1234 switch (ctrl->type) {
1235 case V4L2_CTRL_TYPE_BUTTON:
1237 case V4L2_CTRL_TYPE_STRING:
1238 idx *= ctrl->elem_size;
1239 /* strings are always 0-terminated */
1240 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1241 case V4L2_CTRL_TYPE_INTEGER64:
1242 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1243 case V4L2_CTRL_TYPE_U8:
1244 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1245 case V4L2_CTRL_TYPE_U16:
1246 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1247 case V4L2_CTRL_TYPE_U32:
1248 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1251 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1252 idx *= ctrl->elem_size;
1253 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1257 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1258 union v4l2_ctrl_ptr ptr)
1260 switch (ctrl->type) {
1261 case V4L2_CTRL_TYPE_STRING:
1262 idx *= ctrl->elem_size;
1263 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1264 ptr.p_char[idx + ctrl->minimum] = '\0';
1266 case V4L2_CTRL_TYPE_INTEGER64:
1267 ptr.p_s64[idx] = ctrl->default_value;
1269 case V4L2_CTRL_TYPE_INTEGER:
1270 case V4L2_CTRL_TYPE_INTEGER_MENU:
1271 case V4L2_CTRL_TYPE_MENU:
1272 case V4L2_CTRL_TYPE_BITMASK:
1273 case V4L2_CTRL_TYPE_BOOLEAN:
1274 ptr.p_s32[idx] = ctrl->default_value;
1276 case V4L2_CTRL_TYPE_U8:
1277 ptr.p_u8[idx] = ctrl->default_value;
1279 case V4L2_CTRL_TYPE_U16:
1280 ptr.p_u16[idx] = ctrl->default_value;
1282 case V4L2_CTRL_TYPE_U32:
1283 ptr.p_u32[idx] = ctrl->default_value;
1286 idx *= ctrl->elem_size;
1287 memset(ptr.p + idx, 0, ctrl->elem_size);
1292 static void std_log(const struct v4l2_ctrl *ctrl)
1294 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1296 if (ctrl->is_array) {
1299 for (i = 0; i < ctrl->nr_of_dims; i++)
1300 pr_cont("[%u]", ctrl->dims[i]);
1304 switch (ctrl->type) {
1305 case V4L2_CTRL_TYPE_INTEGER:
1306 pr_cont("%d", *ptr.p_s32);
1308 case V4L2_CTRL_TYPE_BOOLEAN:
1309 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1311 case V4L2_CTRL_TYPE_MENU:
1312 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1314 case V4L2_CTRL_TYPE_INTEGER_MENU:
1315 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1317 case V4L2_CTRL_TYPE_BITMASK:
1318 pr_cont("0x%08x", *ptr.p_s32);
1320 case V4L2_CTRL_TYPE_INTEGER64:
1321 pr_cont("%lld", *ptr.p_s64);
1323 case V4L2_CTRL_TYPE_STRING:
1324 pr_cont("%s", ptr.p_char);
1326 case V4L2_CTRL_TYPE_U8:
1327 pr_cont("%u", (unsigned)*ptr.p_u8);
1329 case V4L2_CTRL_TYPE_U16:
1330 pr_cont("%u", (unsigned)*ptr.p_u16);
1332 case V4L2_CTRL_TYPE_U32:
1333 pr_cont("%u", (unsigned)*ptr.p_u32);
1336 pr_cont("unknown type %d", ctrl->type);
1342 * Round towards the closest legal value. Be careful when we are
1343 * close to the maximum range of the control type to prevent
1346 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1348 offset_type offset; \
1349 if ((ctrl)->maximum >= 0 && \
1350 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1351 val = (ctrl)->maximum; \
1353 val += (s32)((ctrl)->step / 2); \
1354 val = clamp_t(typeof(val), val, \
1355 (ctrl)->minimum, (ctrl)->maximum); \
1356 offset = (val) - (ctrl)->minimum; \
1357 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1358 val = (ctrl)->minimum + offset; \
1362 /* Validate a new control */
1363 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1364 union v4l2_ctrl_ptr ptr)
1370 switch (ctrl->type) {
1371 case V4L2_CTRL_TYPE_INTEGER:
1372 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1373 case V4L2_CTRL_TYPE_INTEGER64:
1375 * We can't use the ROUND_TO_RANGE define here due to
1376 * the u64 divide that needs special care.
1378 val = ptr.p_s64[idx];
1379 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1380 val = ctrl->maximum;
1382 val += (s64)(ctrl->step / 2);
1383 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1384 offset = val - ctrl->minimum;
1385 do_div(offset, ctrl->step);
1386 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1388 case V4L2_CTRL_TYPE_U8:
1389 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1390 case V4L2_CTRL_TYPE_U16:
1391 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1392 case V4L2_CTRL_TYPE_U32:
1393 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1395 case V4L2_CTRL_TYPE_BOOLEAN:
1396 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1399 case V4L2_CTRL_TYPE_MENU:
1400 case V4L2_CTRL_TYPE_INTEGER_MENU:
1401 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1403 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1405 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1406 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1410 case V4L2_CTRL_TYPE_BITMASK:
1411 ptr.p_s32[idx] &= ctrl->maximum;
1414 case V4L2_CTRL_TYPE_BUTTON:
1415 case V4L2_CTRL_TYPE_CTRL_CLASS:
1419 case V4L2_CTRL_TYPE_STRING:
1420 idx *= ctrl->elem_size;
1421 len = strlen(ptr.p_char + idx);
1422 if (len < ctrl->minimum)
1424 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1433 static const struct v4l2_ctrl_type_ops std_type_ops = {
1437 .validate = std_validate,
1440 /* Helper function: copy the given control value back to the caller */
1441 static int ptr_to_user(struct v4l2_ext_control *c,
1442 struct v4l2_ctrl *ctrl,
1443 union v4l2_ctrl_ptr ptr)
1447 if (ctrl->is_ptr && !ctrl->is_string)
1448 return copy_to_user(c->ptr, ptr.p, c->size) ?
1451 switch (ctrl->type) {
1452 case V4L2_CTRL_TYPE_STRING:
1453 len = strlen(ptr.p_char);
1454 if (c->size < len + 1) {
1455 c->size = ctrl->elem_size;
1458 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1460 case V4L2_CTRL_TYPE_INTEGER64:
1461 c->value64 = *ptr.p_s64;
1464 c->value = *ptr.p_s32;
1470 /* Helper function: copy the current control value back to the caller */
1471 static int cur_to_user(struct v4l2_ext_control *c,
1472 struct v4l2_ctrl *ctrl)
1474 return ptr_to_user(c, ctrl, ctrl->p_cur);
1477 /* Helper function: copy the new control value back to the caller */
1478 static int new_to_user(struct v4l2_ext_control *c,
1479 struct v4l2_ctrl *ctrl)
1481 return ptr_to_user(c, ctrl, ctrl->p_new);
1484 /* Helper function: copy the caller-provider value to the given control value */
1485 static int user_to_ptr(struct v4l2_ext_control *c,
1486 struct v4l2_ctrl *ctrl,
1487 union v4l2_ctrl_ptr ptr)
1493 if (ctrl->is_ptr && !ctrl->is_string) {
1496 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1497 if (ret || !ctrl->is_array)
1499 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1500 ctrl->type_ops->init(ctrl, idx, ptr);
1504 switch (ctrl->type) {
1505 case V4L2_CTRL_TYPE_INTEGER64:
1506 *ptr.p_s64 = c->value64;
1508 case V4L2_CTRL_TYPE_STRING:
1512 if (size > ctrl->maximum + 1)
1513 size = ctrl->maximum + 1;
1514 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1516 char last = ptr.p_char[size - 1];
1518 ptr.p_char[size - 1] = 0;
1519 /* If the string was longer than ctrl->maximum,
1520 then return an error. */
1521 if (strlen(ptr.p_char) == ctrl->maximum && last)
1526 *ptr.p_s32 = c->value;
1532 /* Helper function: copy the caller-provider value as the new control value */
1533 static int user_to_new(struct v4l2_ext_control *c,
1534 struct v4l2_ctrl *ctrl)
1536 return user_to_ptr(c, ctrl, ctrl->p_new);
1539 /* Copy the one value to another. */
1540 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1541 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1545 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1548 /* Copy the new value to the current value. */
1549 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1556 /* has_changed is set by cluster_changed */
1557 changed = ctrl->has_changed;
1559 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1561 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1562 /* Note: CH_FLAGS is only set for auto clusters. */
1564 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1565 if (!is_cur_manual(ctrl->cluster[0])) {
1566 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1567 if (ctrl->cluster[0]->has_volatiles)
1568 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1572 if (changed || ch_flags) {
1573 /* If a control was changed that was not one of the controls
1574 modified by the application, then send the event to all. */
1577 send_event(fh, ctrl,
1578 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1579 if (ctrl->call_notify && changed && ctrl->handler->notify)
1580 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1584 /* Copy the current value to the new value */
1585 static void cur_to_new(struct v4l2_ctrl *ctrl)
1589 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1592 /* Return non-zero if one or more of the controls in the cluster has a new
1593 value that differs from the current value. */
1594 static int cluster_changed(struct v4l2_ctrl *master)
1596 bool changed = false;
1600 for (i = 0; i < master->ncontrols; i++) {
1601 struct v4l2_ctrl *ctrl = master->cluster[i];
1602 bool ctrl_changed = false;
1606 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1607 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1608 ctrl->p_cur, ctrl->p_new);
1609 ctrl->has_changed = ctrl_changed;
1610 changed |= ctrl->has_changed;
1615 /* Control range checking */
1616 static int check_range(enum v4l2_ctrl_type type,
1617 s64 min, s64 max, u64 step, s64 def)
1620 case V4L2_CTRL_TYPE_BOOLEAN:
1621 if (step != 1 || max > 1 || min < 0)
1624 case V4L2_CTRL_TYPE_U8:
1625 case V4L2_CTRL_TYPE_U16:
1626 case V4L2_CTRL_TYPE_U32:
1627 case V4L2_CTRL_TYPE_INTEGER:
1628 case V4L2_CTRL_TYPE_INTEGER64:
1629 if (step == 0 || min > max || def < min || def > max)
1632 case V4L2_CTRL_TYPE_BITMASK:
1633 if (step || min || !max || (def & ~max))
1636 case V4L2_CTRL_TYPE_MENU:
1637 case V4L2_CTRL_TYPE_INTEGER_MENU:
1638 if (min > max || def < min || def > max)
1640 /* Note: step == menu_skip_mask for menu controls.
1641 So here we check if the default value is masked out. */
1642 if (step && ((1 << def) & step))
1645 case V4L2_CTRL_TYPE_STRING:
1646 if (min > max || min < 0 || step < 1 || def)
1654 /* Validate a new control */
1655 static int validate_new(const struct v4l2_ctrl *ctrl,
1656 struct v4l2_ext_control *c)
1658 union v4l2_ctrl_ptr ptr;
1662 if (!ctrl->is_ptr) {
1663 switch (ctrl->type) {
1664 case V4L2_CTRL_TYPE_INTEGER:
1665 case V4L2_CTRL_TYPE_INTEGER_MENU:
1666 case V4L2_CTRL_TYPE_MENU:
1667 case V4L2_CTRL_TYPE_BITMASK:
1668 case V4L2_CTRL_TYPE_BOOLEAN:
1669 case V4L2_CTRL_TYPE_BUTTON:
1670 case V4L2_CTRL_TYPE_CTRL_CLASS:
1671 ptr.p_s32 = &c->value;
1672 return ctrl->type_ops->validate(ctrl, 0, ptr);
1674 case V4L2_CTRL_TYPE_INTEGER64:
1675 ptr.p_s64 = &c->value64;
1676 return ctrl->type_ops->validate(ctrl, 0, ptr);
1682 for (idx = 0; !err && idx < c->size / ctrl->elem_size; idx++)
1683 err = ctrl->type_ops->validate(ctrl, idx, ptr);
1687 static inline u32 node2id(struct list_head *node)
1689 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1692 /* Set the handler's error code if it wasn't set earlier already */
1693 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1695 if (hdl->error == 0)
1700 /* Initialize the handler */
1701 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1702 unsigned nr_of_controls_hint,
1703 struct lock_class_key *key, const char *name)
1705 hdl->lock = &hdl->_lock;
1706 mutex_init(hdl->lock);
1707 lockdep_set_class_and_name(hdl->lock, key, name);
1708 INIT_LIST_HEAD(&hdl->ctrls);
1709 INIT_LIST_HEAD(&hdl->ctrl_refs);
1710 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1711 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1713 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1716 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1718 /* Free all controls and control refs */
1719 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1721 struct v4l2_ctrl_ref *ref, *next_ref;
1722 struct v4l2_ctrl *ctrl, *next_ctrl;
1723 struct v4l2_subscribed_event *sev, *next_sev;
1725 if (hdl == NULL || hdl->buckets == NULL)
1728 mutex_lock(hdl->lock);
1729 /* Free all nodes */
1730 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1731 list_del(&ref->node);
1734 /* Free all controls owned by the handler */
1735 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1736 list_del(&ctrl->node);
1737 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1738 list_del(&sev->node);
1741 kfree(hdl->buckets);
1742 hdl->buckets = NULL;
1745 mutex_unlock(hdl->lock);
1747 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1749 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1750 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1751 with applications that do not use the NEXT_CTRL flag.
1753 We just find the n-th private user control. It's O(N), but that should not
1754 be an issue in this particular case. */
1755 static struct v4l2_ctrl_ref *find_private_ref(
1756 struct v4l2_ctrl_handler *hdl, u32 id)
1758 struct v4l2_ctrl_ref *ref;
1760 id -= V4L2_CID_PRIVATE_BASE;
1761 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1762 /* Search for private user controls that are compatible with
1764 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1765 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1766 if (!ref->ctrl->is_int)
1776 /* Find a control with the given ID. */
1777 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1779 struct v4l2_ctrl_ref *ref;
1782 id &= V4L2_CTRL_ID_MASK;
1784 /* Old-style private controls need special handling */
1785 if (id >= V4L2_CID_PRIVATE_BASE)
1786 return find_private_ref(hdl, id);
1787 bucket = id % hdl->nr_of_buckets;
1789 /* Simple optimization: cache the last control found */
1790 if (hdl->cached && hdl->cached->ctrl->id == id)
1793 /* Not in cache, search the hash */
1794 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1795 while (ref && ref->ctrl->id != id)
1799 hdl->cached = ref; /* cache it! */
1803 /* Find a control with the given ID. Take the handler's lock first. */
1804 static struct v4l2_ctrl_ref *find_ref_lock(
1805 struct v4l2_ctrl_handler *hdl, u32 id)
1807 struct v4l2_ctrl_ref *ref = NULL;
1810 mutex_lock(hdl->lock);
1811 ref = find_ref(hdl, id);
1812 mutex_unlock(hdl->lock);
1817 /* Find a control with the given ID. */
1818 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1820 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1822 return ref ? ref->ctrl : NULL;
1824 EXPORT_SYMBOL(v4l2_ctrl_find);
1826 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1827 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1828 struct v4l2_ctrl *ctrl)
1830 struct v4l2_ctrl_ref *ref;
1831 struct v4l2_ctrl_ref *new_ref;
1833 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1834 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1837 * Automatically add the control class if it is not yet present and
1838 * the new control is not a compound control.
1840 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1841 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1842 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1848 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1850 return handler_set_err(hdl, -ENOMEM);
1851 new_ref->ctrl = ctrl;
1852 if (ctrl->handler == hdl) {
1853 /* By default each control starts in a cluster of its own.
1854 new_ref->ctrl is basically a cluster array with one
1855 element, so that's perfect to use as the cluster pointer.
1856 But only do this for the handler that owns the control. */
1857 ctrl->cluster = &new_ref->ctrl;
1858 ctrl->ncontrols = 1;
1861 INIT_LIST_HEAD(&new_ref->node);
1863 mutex_lock(hdl->lock);
1865 /* Add immediately at the end of the list if the list is empty, or if
1866 the last element in the list has a lower ID.
1867 This ensures that when elements are added in ascending order the
1868 insertion is an O(1) operation. */
1869 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1870 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1871 goto insert_in_hash;
1874 /* Find insert position in sorted list */
1875 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1876 if (ref->ctrl->id < id)
1878 /* Don't add duplicates */
1879 if (ref->ctrl->id == id) {
1883 list_add(&new_ref->node, ref->node.prev);
1888 /* Insert the control node in the hash */
1889 new_ref->next = hdl->buckets[bucket];
1890 hdl->buckets[bucket] = new_ref;
1893 mutex_unlock(hdl->lock);
1897 /* Add a new control */
1898 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1899 const struct v4l2_ctrl_ops *ops,
1900 const struct v4l2_ctrl_type_ops *type_ops,
1901 u32 id, const char *name, enum v4l2_ctrl_type type,
1902 s64 min, s64 max, u64 step, s64 def,
1903 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1904 u32 flags, const char * const *qmenu,
1905 const s64 *qmenu_int, void *priv)
1907 struct v4l2_ctrl *ctrl;
1909 unsigned nr_of_dims = 0;
1912 unsigned tot_ctrl_size;
1920 while (dims && dims[nr_of_dims]) {
1921 elems *= dims[nr_of_dims];
1923 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1926 is_array = nr_of_dims > 0;
1928 /* Prefill elem_size for all types handled by std_type_ops */
1930 case V4L2_CTRL_TYPE_INTEGER64:
1931 elem_size = sizeof(s64);
1933 case V4L2_CTRL_TYPE_STRING:
1934 elem_size = max + 1;
1936 case V4L2_CTRL_TYPE_U8:
1937 elem_size = sizeof(u8);
1939 case V4L2_CTRL_TYPE_U16:
1940 elem_size = sizeof(u16);
1942 case V4L2_CTRL_TYPE_U32:
1943 elem_size = sizeof(u32);
1946 if (type < V4L2_CTRL_COMPOUND_TYPES)
1947 elem_size = sizeof(s32);
1950 tot_ctrl_size = elem_size * elems;
1953 if (id == 0 || name == NULL || !elem_size ||
1954 id >= V4L2_CID_PRIVATE_BASE ||
1955 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1956 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1957 handler_set_err(hdl, -ERANGE);
1960 err = check_range(type, min, max, step, def);
1962 handler_set_err(hdl, err);
1965 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1966 handler_set_err(hdl, -ERANGE);
1970 (type == V4L2_CTRL_TYPE_BUTTON ||
1971 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
1972 handler_set_err(hdl, -EINVAL);
1977 if (type == V4L2_CTRL_TYPE_BUTTON)
1978 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1979 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1980 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1981 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
1982 type == V4L2_CTRL_TYPE_STRING ||
1983 type >= V4L2_CTRL_COMPOUND_TYPES ||
1985 sz_extra += 2 * tot_ctrl_size;
1987 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1989 handler_set_err(hdl, -ENOMEM);
1993 INIT_LIST_HEAD(&ctrl->node);
1994 INIT_LIST_HEAD(&ctrl->ev_subs);
1995 ctrl->handler = hdl;
1997 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2001 ctrl->flags = flags;
2002 ctrl->minimum = min;
2003 ctrl->maximum = max;
2005 ctrl->default_value = def;
2006 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2007 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2008 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2009 ctrl->is_array = is_array;
2010 ctrl->elems = elems;
2011 ctrl->nr_of_dims = nr_of_dims;
2013 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2014 ctrl->elem_size = elem_size;
2015 if (type == V4L2_CTRL_TYPE_MENU)
2016 ctrl->qmenu = qmenu;
2017 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2018 ctrl->qmenu_int = qmenu_int;
2020 ctrl->cur.val = ctrl->val = def;
2023 if (!ctrl->is_int) {
2024 ctrl->p_new.p = data;
2025 ctrl->p_cur.p = data + tot_ctrl_size;
2027 ctrl->p_new.p = &ctrl->val;
2028 ctrl->p_cur.p = &ctrl->cur.val;
2030 for (idx = 0; idx < elems; idx++) {
2031 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2032 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2035 if (handler_new_ref(hdl, ctrl)) {
2039 mutex_lock(hdl->lock);
2040 list_add_tail(&ctrl->node, &hdl->ctrls);
2041 mutex_unlock(hdl->lock);
2045 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2046 const struct v4l2_ctrl_config *cfg, void *priv)
2049 struct v4l2_ctrl *ctrl;
2050 const char *name = cfg->name;
2051 const char * const *qmenu = cfg->qmenu;
2052 const s64 *qmenu_int = cfg->qmenu_int;
2053 enum v4l2_ctrl_type type = cfg->type;
2054 u32 flags = cfg->flags;
2057 u64 step = cfg->step;
2061 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2064 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2065 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2069 WARN_ON(cfg->menu_skip_mask);
2070 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2071 qmenu = v4l2_ctrl_get_menu(cfg->id);
2072 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2073 qmenu_int == NULL) {
2074 handler_set_err(hdl, -EINVAL);
2078 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2080 is_menu ? cfg->menu_skip_mask : step, def,
2081 cfg->dims, cfg->elem_size,
2082 flags, qmenu, qmenu_int, priv);
2084 ctrl->is_private = cfg->is_private;
2087 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2089 /* Helper function for standard non-menu controls */
2090 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2091 const struct v4l2_ctrl_ops *ops,
2092 u32 id, s64 min, s64 max, u64 step, s64 def)
2095 enum v4l2_ctrl_type type;
2098 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2099 if (type == V4L2_CTRL_TYPE_MENU ||
2100 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2101 type >= V4L2_CTRL_COMPOUND_TYPES) {
2102 handler_set_err(hdl, -EINVAL);
2105 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2106 min, max, step, def, NULL, 0,
2107 flags, NULL, NULL, NULL);
2109 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2111 /* Helper function for standard menu controls */
2112 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2113 const struct v4l2_ctrl_ops *ops,
2114 u32 id, u8 _max, u64 mask, u8 _def)
2116 const char * const *qmenu = NULL;
2117 const s64 *qmenu_int = NULL;
2118 unsigned int qmenu_int_len = 0;
2120 enum v4l2_ctrl_type type;
2127 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2129 if (type == V4L2_CTRL_TYPE_MENU)
2130 qmenu = v4l2_ctrl_get_menu(id);
2131 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2132 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2134 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2135 handler_set_err(hdl, -EINVAL);
2138 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2139 0, max, mask, def, NULL, 0,
2140 flags, qmenu, qmenu_int, NULL);
2142 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2144 /* Helper function for standard menu controls with driver defined menu */
2145 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2146 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2147 u64 mask, u8 _def, const char * const *qmenu)
2149 enum v4l2_ctrl_type type;
2157 /* v4l2_ctrl_new_std_menu_items() should only be called for
2158 * standard controls without a standard menu.
2160 if (v4l2_ctrl_get_menu(id)) {
2161 handler_set_err(hdl, -EINVAL);
2165 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2166 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2167 handler_set_err(hdl, -EINVAL);
2170 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2171 0, max, mask, def, NULL, 0,
2172 flags, qmenu, NULL, NULL);
2175 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2177 /* Helper function for standard integer menu controls */
2178 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2179 const struct v4l2_ctrl_ops *ops,
2180 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2183 enum v4l2_ctrl_type type;
2190 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2191 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2192 handler_set_err(hdl, -EINVAL);
2195 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2196 0, max, 0, def, NULL, 0,
2197 flags, NULL, qmenu_int, NULL);
2199 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2201 /* Add a control from another handler to this handler */
2202 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
2203 struct v4l2_ctrl *ctrl)
2205 if (hdl == NULL || hdl->error)
2208 handler_set_err(hdl, -EINVAL);
2211 if (ctrl->handler == hdl)
2213 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
2215 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
2217 /* Add the controls from another handler to our own. */
2218 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2219 struct v4l2_ctrl_handler *add,
2220 bool (*filter)(const struct v4l2_ctrl *ctrl))
2222 struct v4l2_ctrl_ref *ref;
2225 /* Do nothing if either handler is NULL or if they are the same */
2226 if (!hdl || !add || hdl == add)
2230 mutex_lock(add->lock);
2231 list_for_each_entry(ref, &add->ctrl_refs, node) {
2232 struct v4l2_ctrl *ctrl = ref->ctrl;
2234 /* Skip handler-private controls. */
2235 if (ctrl->is_private)
2237 /* And control classes */
2238 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2240 /* Filter any unwanted controls */
2241 if (filter && !filter(ctrl))
2243 ret = handler_new_ref(hdl, ctrl);
2247 mutex_unlock(add->lock);
2250 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2252 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2254 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2256 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2259 case V4L2_CID_AUDIO_MUTE:
2260 case V4L2_CID_AUDIO_VOLUME:
2261 case V4L2_CID_AUDIO_BALANCE:
2262 case V4L2_CID_AUDIO_BASS:
2263 case V4L2_CID_AUDIO_TREBLE:
2264 case V4L2_CID_AUDIO_LOUDNESS:
2271 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2273 /* Cluster controls */
2274 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2276 bool has_volatiles = false;
2279 /* The first control is the master control and it must not be NULL */
2280 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2283 for (i = 0; i < ncontrols; i++) {
2285 controls[i]->cluster = controls;
2286 controls[i]->ncontrols = ncontrols;
2287 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2288 has_volatiles = true;
2291 controls[0]->has_volatiles = has_volatiles;
2293 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2295 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2296 u8 manual_val, bool set_volatile)
2298 struct v4l2_ctrl *master = controls[0];
2302 v4l2_ctrl_cluster(ncontrols, controls);
2303 WARN_ON(ncontrols <= 1);
2304 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2305 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2306 master->is_auto = true;
2307 master->has_volatiles = set_volatile;
2308 master->manual_mode_value = manual_val;
2309 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2311 if (!is_cur_manual(master))
2312 flag = V4L2_CTRL_FLAG_INACTIVE |
2313 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2315 for (i = 1; i < ncontrols; i++)
2317 controls[i]->flags |= flag;
2319 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2321 /* Activate/deactivate a control. */
2322 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2324 /* invert since the actual flag is called 'inactive' */
2325 bool inactive = !active;
2332 /* set V4L2_CTRL_FLAG_INACTIVE */
2333 old = test_and_set_bit(4, &ctrl->flags);
2335 /* clear V4L2_CTRL_FLAG_INACTIVE */
2336 old = test_and_clear_bit(4, &ctrl->flags);
2337 if (old != inactive)
2338 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2340 EXPORT_SYMBOL(v4l2_ctrl_activate);
2342 /* Grab/ungrab a control.
2343 Typically used when streaming starts and you want to grab controls,
2344 preventing the user from changing them.
2346 Just call this and the framework will block any attempts to change
2348 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2355 v4l2_ctrl_lock(ctrl);
2357 /* set V4L2_CTRL_FLAG_GRABBED */
2358 old = test_and_set_bit(1, &ctrl->flags);
2360 /* clear V4L2_CTRL_FLAG_GRABBED */
2361 old = test_and_clear_bit(1, &ctrl->flags);
2363 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2364 v4l2_ctrl_unlock(ctrl);
2366 EXPORT_SYMBOL(v4l2_ctrl_grab);
2368 /* Log the control name and value */
2369 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2370 const char *prefix, const char *colon)
2372 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2374 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2377 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2379 ctrl->type_ops->log(ctrl);
2381 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2382 V4L2_CTRL_FLAG_GRABBED |
2383 V4L2_CTRL_FLAG_VOLATILE)) {
2384 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2385 pr_cont(" inactive");
2386 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2387 pr_cont(" grabbed");
2388 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2389 pr_cont(" volatile");
2394 /* Log all controls owned by the handler */
2395 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2398 struct v4l2_ctrl *ctrl;
2399 const char *colon = "";
2406 len = strlen(prefix);
2407 if (len && prefix[len - 1] != ' ')
2409 mutex_lock(hdl->lock);
2410 list_for_each_entry(ctrl, &hdl->ctrls, node)
2411 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2412 log_ctrl(ctrl, prefix, colon);
2413 mutex_unlock(hdl->lock);
2415 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2417 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2419 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2422 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2424 /* Call s_ctrl for all controls owned by the handler */
2425 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2427 struct v4l2_ctrl *ctrl;
2432 mutex_lock(hdl->lock);
2433 list_for_each_entry(ctrl, &hdl->ctrls, node)
2436 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2437 struct v4l2_ctrl *master = ctrl->cluster[0];
2440 /* Skip if this control was already handled by a cluster. */
2441 /* Skip button controls and read-only controls. */
2442 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2443 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2446 for (i = 0; i < master->ncontrols; i++) {
2447 if (master->cluster[i]) {
2448 cur_to_new(master->cluster[i]);
2449 master->cluster[i]->is_new = 1;
2450 master->cluster[i]->done = true;
2453 ret = call_op(master, s_ctrl);
2457 mutex_unlock(hdl->lock);
2460 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2462 /* Implement VIDIOC_QUERY_EXT_CTRL */
2463 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2465 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2466 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2467 struct v4l2_ctrl_ref *ref;
2468 struct v4l2_ctrl *ctrl;
2473 mutex_lock(hdl->lock);
2475 /* Try to find it */
2476 ref = find_ref(hdl, id);
2478 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2480 /* Match any control that is not hidden */
2484 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2485 /* Match any hidden control */
2487 } else if ((qc->id & next_flags) == next_flags) {
2488 /* Match any control, compound or not */
2492 /* Find the next control with ID > qc->id */
2494 /* Did we reach the end of the control list? */
2495 if (id >= node2id(hdl->ctrl_refs.prev)) {
2496 ref = NULL; /* Yes, so there is no next control */
2498 /* We found a control with the given ID, so just get
2499 the next valid one in the list. */
2500 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2502 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2503 if (id < ref->ctrl->id &&
2504 (is_compound & mask) == match)
2507 if (&ref->node == &hdl->ctrl_refs)
2510 /* No control with the given ID exists, so start
2511 searching for the next largest ID. We know there
2512 is one, otherwise the first 'if' above would have
2514 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2516 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2517 if (id < ref->ctrl->id &&
2518 (is_compound & mask) == match)
2521 if (&ref->node == &hdl->ctrl_refs)
2525 mutex_unlock(hdl->lock);
2531 memset(qc, 0, sizeof(*qc));
2532 if (id >= V4L2_CID_PRIVATE_BASE)
2536 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2537 qc->flags = ctrl->flags;
2538 qc->type = ctrl->type;
2540 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2541 qc->elem_size = ctrl->elem_size;
2542 qc->elems = ctrl->elems;
2543 qc->nr_of_dims = ctrl->nr_of_dims;
2544 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2545 qc->minimum = ctrl->minimum;
2546 qc->maximum = ctrl->maximum;
2547 qc->default_value = ctrl->default_value;
2548 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2549 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2552 qc->step = ctrl->step;
2555 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2557 /* Implement VIDIOC_QUERYCTRL */
2558 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2560 struct v4l2_query_ext_ctrl qec = { qc->id };
2563 rc = v4l2_query_ext_ctrl(hdl, &qec);
2568 qc->type = qec.type;
2569 qc->flags = qec.flags;
2570 strlcpy(qc->name, qec.name, sizeof(qc->name));
2572 case V4L2_CTRL_TYPE_INTEGER:
2573 case V4L2_CTRL_TYPE_BOOLEAN:
2574 case V4L2_CTRL_TYPE_MENU:
2575 case V4L2_CTRL_TYPE_INTEGER_MENU:
2576 case V4L2_CTRL_TYPE_STRING:
2577 case V4L2_CTRL_TYPE_BITMASK:
2578 qc->minimum = qec.minimum;
2579 qc->maximum = qec.maximum;
2580 qc->step = qec.step;
2581 qc->default_value = qec.default_value;
2587 qc->default_value = 0;
2592 EXPORT_SYMBOL(v4l2_queryctrl);
2594 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2596 if (qc->id & (V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND))
2598 return v4l2_queryctrl(sd->ctrl_handler, qc);
2600 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2602 /* Implement VIDIOC_QUERYMENU */
2603 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2605 struct v4l2_ctrl *ctrl;
2608 ctrl = v4l2_ctrl_find(hdl, qm->id);
2614 switch (ctrl->type) {
2615 case V4L2_CTRL_TYPE_MENU:
2616 if (ctrl->qmenu == NULL)
2619 case V4L2_CTRL_TYPE_INTEGER_MENU:
2620 if (ctrl->qmenu_int == NULL)
2627 if (i < ctrl->minimum || i > ctrl->maximum)
2630 /* Use mask to see if this menu item should be skipped */
2631 if (ctrl->menu_skip_mask & (1 << i))
2633 /* Empty menu items should also be skipped */
2634 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2635 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2637 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2639 qm->value = ctrl->qmenu_int[i];
2643 EXPORT_SYMBOL(v4l2_querymenu);
2645 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2647 return v4l2_querymenu(sd->ctrl_handler, qm);
2649 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2653 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2655 It is not a fully atomic operation, just best-effort only. After all, if
2656 multiple controls have to be set through multiple i2c writes (for example)
2657 then some initial writes may succeed while others fail. Thus leaving the
2658 system in an inconsistent state. The question is how much effort you are
2659 willing to spend on trying to make something atomic that really isn't.
2661 From the point of view of an application the main requirement is that
2662 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2663 error should be returned without actually affecting any controls.
2665 If all the values are correct, then it is acceptable to just give up
2666 in case of low-level errors.
2668 It is important though that the application can tell when only a partial
2669 configuration was done. The way we do that is through the error_idx field
2670 of struct v4l2_ext_controls: if that is equal to the count field then no
2671 controls were affected. Otherwise all controls before that index were
2672 successful in performing their 'get' or 'set' operation, the control at
2673 the given index failed, and you don't know what happened with the controls
2674 after the failed one. Since if they were part of a control cluster they
2675 could have been successfully processed (if a cluster member was encountered
2676 at index < error_idx), they could have failed (if a cluster member was at
2677 error_idx), or they may not have been processed yet (if the first cluster
2678 member appeared after error_idx).
2680 It is all fairly theoretical, though. In practice all you can do is to
2681 bail out. If error_idx == count, then it is an application bug. If
2682 error_idx < count then it is only an application bug if the error code was
2683 EBUSY. That usually means that something started streaming just when you
2684 tried to set the controls. In all other cases it is a driver/hardware
2685 problem and all you can do is to retry or bail out.
2687 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2688 never modifies controls the error_idx is just set to whatever control
2689 has an invalid value.
2692 /* Prepare for the extended g/s/try functions.
2693 Find the controls in the control array and do some basic checks. */
2694 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2695 struct v4l2_ext_controls *cs,
2696 struct v4l2_ctrl_helper *helpers,
2699 struct v4l2_ctrl_helper *h;
2700 bool have_clusters = false;
2703 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2704 struct v4l2_ext_control *c = &cs->controls[i];
2705 struct v4l2_ctrl_ref *ref;
2706 struct v4l2_ctrl *ctrl;
2707 u32 id = c->id & V4L2_CTRL_ID_MASK;
2711 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2714 /* Old-style private controls are not allowed for
2715 extended controls */
2716 if (id >= V4L2_CID_PRIVATE_BASE)
2718 ref = find_ref_lock(hdl, id);
2722 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2725 if (ctrl->cluster[0]->ncontrols > 1)
2726 have_clusters = true;
2727 if (ctrl->cluster[0] != ctrl)
2728 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2729 if (ctrl->is_ptr && !ctrl->is_string) {
2730 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2732 if (c->size < tot_size) {
2741 /* Store the ref to the master control of the cluster */
2744 /* Initially set next to 0, meaning that there is no other
2745 control in this helper array belonging to the same
2750 /* We are done if there were no controls that belong to a multi-
2755 /* The code below figures out in O(n) time which controls in the list
2756 belong to the same cluster. */
2758 /* This has to be done with the handler lock taken. */
2759 mutex_lock(hdl->lock);
2761 /* First zero the helper field in the master control references */
2762 for (i = 0; i < cs->count; i++)
2763 helpers[i].mref->helper = NULL;
2764 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2765 struct v4l2_ctrl_ref *mref = h->mref;
2767 /* If the mref->helper is set, then it points to an earlier
2768 helper that belongs to the same cluster. */
2770 /* Set the next field of mref->helper to the current
2771 index: this means that that earlier helper now
2772 points to the next helper in the same cluster. */
2773 mref->helper->next = i;
2774 /* mref should be set only for the first helper in the
2775 cluster, clear the others. */
2778 /* Point the mref helper to the current helper struct. */
2781 mutex_unlock(hdl->lock);
2785 /* Handles the corner case where cs->count == 0. It checks whether the
2786 specified control class exists. If that class ID is 0, then it checks
2787 whether there are any controls at all. */
2788 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2790 if (ctrl_class == 0)
2791 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2792 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2797 /* Get extended controls. Allocates the helpers array if needed. */
2798 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2800 struct v4l2_ctrl_helper helper[4];
2801 struct v4l2_ctrl_helper *helpers = helper;
2805 cs->error_idx = cs->count;
2806 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2812 return class_check(hdl, cs->ctrl_class);
2814 if (cs->count > ARRAY_SIZE(helper)) {
2815 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2817 if (helpers == NULL)
2821 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2822 cs->error_idx = cs->count;
2824 for (i = 0; !ret && i < cs->count; i++)
2825 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2828 for (i = 0; !ret && i < cs->count; i++) {
2829 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2830 struct v4l2_ctrl *ctrl) = cur_to_user;
2831 struct v4l2_ctrl *master;
2833 if (helpers[i].mref == NULL)
2836 master = helpers[i].mref->ctrl;
2839 v4l2_ctrl_lock(master);
2841 /* g_volatile_ctrl will update the new control values */
2842 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2843 (master->has_volatiles && !is_cur_manual(master))) {
2844 for (j = 0; j < master->ncontrols; j++)
2845 cur_to_new(master->cluster[j]);
2846 ret = call_op(master, g_volatile_ctrl);
2847 ctrl_to_user = new_to_user;
2849 /* If OK, then copy the current (for non-volatile controls)
2850 or the new (for volatile controls) control values to the
2856 ret = ctrl_to_user(cs->controls + idx,
2858 idx = helpers[idx].next;
2859 } while (!ret && idx);
2861 v4l2_ctrl_unlock(master);
2864 if (cs->count > ARRAY_SIZE(helper))
2868 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2870 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2872 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2874 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2876 /* Helper function to get a single control */
2877 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2879 struct v4l2_ctrl *master = ctrl->cluster[0];
2883 /* Compound controls are not supported. The new_to_user() and
2884 * cur_to_user() calls below would need to be modified not to access
2885 * userspace memory when called from get_ctrl().
2890 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2893 v4l2_ctrl_lock(master);
2894 /* g_volatile_ctrl will update the current control values */
2895 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2896 for (i = 0; i < master->ncontrols; i++)
2897 cur_to_new(master->cluster[i]);
2898 ret = call_op(master, g_volatile_ctrl);
2899 new_to_user(c, ctrl);
2901 cur_to_user(c, ctrl);
2903 v4l2_ctrl_unlock(master);
2907 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2909 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2910 struct v4l2_ext_control c;
2913 if (ctrl == NULL || !ctrl->is_int)
2915 ret = get_ctrl(ctrl, &c);
2916 control->value = c.value;
2919 EXPORT_SYMBOL(v4l2_g_ctrl);
2921 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2923 return v4l2_g_ctrl(sd->ctrl_handler, control);
2925 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2927 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2929 struct v4l2_ext_control c;
2931 /* It's a driver bug if this happens. */
2932 WARN_ON(!ctrl->is_int);
2937 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2939 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2941 struct v4l2_ext_control c;
2943 /* It's a driver bug if this happens. */
2944 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2949 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2952 /* Core function that calls try/s_ctrl and ensures that the new value is
2953 copied to the current value on a set.
2954 Must be called with ctrl->handler->lock held. */
2955 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2956 bool set, u32 ch_flags)
2962 /* Go through the cluster and either validate the new value or
2963 (if no new value was set), copy the current value to the new
2964 value, ensuring a consistent view for the control ops when
2966 for (i = 0; i < master->ncontrols; i++) {
2967 struct v4l2_ctrl *ctrl = master->cluster[i];
2972 if (!ctrl->is_new) {
2976 /* Check again: it may have changed since the
2977 previous check in try_or_set_ext_ctrls(). */
2978 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2982 ret = call_op(master, try_ctrl);
2984 /* Don't set if there is no change */
2985 if (ret || !set || !cluster_changed(master))
2987 ret = call_op(master, s_ctrl);
2991 /* If OK, then make the new values permanent. */
2992 update_flag = is_cur_manual(master) != is_new_manual(master);
2993 for (i = 0; i < master->ncontrols; i++)
2994 new_to_cur(fh, master->cluster[i], ch_flags |
2995 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2999 /* Validate controls. */
3000 static int validate_ctrls(struct v4l2_ext_controls *cs,
3001 struct v4l2_ctrl_helper *helpers, bool set)
3006 cs->error_idx = cs->count;
3007 for (i = 0; i < cs->count; i++) {
3008 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3012 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3014 /* This test is also done in try_set_control_cluster() which
3015 is called in atomic context, so that has the final say,
3016 but it makes sense to do an up-front check as well. Once
3017 an error occurs in try_set_control_cluster() some other
3018 controls may have been set already and we want to do a
3019 best-effort to avoid that. */
3020 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3022 ret = validate_new(ctrl, &cs->controls[i]);
3029 /* Obtain the current volatile values of an autocluster and mark them
3031 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3035 for (i = 0; i < master->ncontrols; i++)
3036 cur_to_new(master->cluster[i]);
3037 if (!call_op(master, g_volatile_ctrl))
3038 for (i = 1; i < master->ncontrols; i++)
3039 if (master->cluster[i])
3040 master->cluster[i]->is_new = 1;
3043 /* Try or try-and-set controls */
3044 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3045 struct v4l2_ext_controls *cs,
3048 struct v4l2_ctrl_helper helper[4];
3049 struct v4l2_ctrl_helper *helpers = helper;
3053 cs->error_idx = cs->count;
3054 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
3060 return class_check(hdl, cs->ctrl_class);
3062 if (cs->count > ARRAY_SIZE(helper)) {
3063 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3068 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3070 ret = validate_ctrls(cs, helpers, set);
3072 cs->error_idx = cs->count;
3073 for (i = 0; !ret && i < cs->count; i++) {
3074 struct v4l2_ctrl *master;
3077 if (helpers[i].mref == NULL)
3081 master = helpers[i].mref->ctrl;
3082 v4l2_ctrl_lock(master);
3084 /* Reset the 'is_new' flags of the cluster */
3085 for (j = 0; j < master->ncontrols; j++)
3086 if (master->cluster[j])
3087 master->cluster[j]->is_new = 0;
3089 /* For volatile autoclusters that are currently in auto mode
3090 we need to discover if it will be set to manual mode.
3091 If so, then we have to copy the current volatile values
3092 first since those will become the new manual values (which
3093 may be overwritten by explicit new values from this set
3095 if (master->is_auto && master->has_volatiles &&
3096 !is_cur_manual(master)) {
3097 /* Pick an initial non-manual value */
3098 s32 new_auto_val = master->manual_mode_value + 1;
3102 /* Check if the auto control is part of the
3103 list, and remember the new value. */
3104 if (helpers[tmp_idx].ctrl == master)
3105 new_auto_val = cs->controls[tmp_idx].value;
3106 tmp_idx = helpers[tmp_idx].next;
3108 /* If the new value == the manual value, then copy
3109 the current volatile values. */
3110 if (new_auto_val == master->manual_mode_value)
3111 update_from_auto_cluster(master);
3114 /* Copy the new caller-supplied control values.
3115 user_to_new() sets 'is_new' to 1. */
3117 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
3118 idx = helpers[idx].next;
3119 } while (!ret && idx);
3122 ret = try_or_set_cluster(fh, master, set, 0);
3124 /* Copy the new values back to userspace. */
3128 ret = new_to_user(cs->controls + idx,
3130 idx = helpers[idx].next;
3131 } while (!ret && idx);
3133 v4l2_ctrl_unlock(master);
3136 if (cs->count > ARRAY_SIZE(helper))
3141 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3143 return try_set_ext_ctrls(NULL, hdl, cs, false);
3145 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3147 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3148 struct v4l2_ext_controls *cs)
3150 return try_set_ext_ctrls(fh, hdl, cs, true);
3152 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3154 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3156 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
3158 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
3160 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3162 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
3164 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
3166 /* Helper function for VIDIOC_S_CTRL compatibility */
3167 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3168 struct v4l2_ext_control *c, u32 ch_flags)
3170 struct v4l2_ctrl *master = ctrl->cluster[0];
3173 /* Reset the 'is_new' flags of the cluster */
3174 for (i = 0; i < master->ncontrols; i++)
3175 if (master->cluster[i])
3176 master->cluster[i]->is_new = 0;
3179 user_to_new(c, ctrl);
3181 /* For autoclusters with volatiles that are switched from auto to
3182 manual mode we have to update the current volatile values since
3183 those will become the initial manual values after such a switch. */
3184 if (master->is_auto && master->has_volatiles && ctrl == master &&
3185 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3186 update_from_auto_cluster(master);
3189 return try_or_set_cluster(fh, master, true, ch_flags);
3192 /* Helper function for VIDIOC_S_CTRL compatibility */
3193 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3194 struct v4l2_ext_control *c)
3196 int ret = validate_new(ctrl, c);
3199 v4l2_ctrl_lock(ctrl);
3200 ret = set_ctrl(fh, ctrl, c, 0);
3202 cur_to_user(c, ctrl);
3203 v4l2_ctrl_unlock(ctrl);
3208 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3209 struct v4l2_control *control)
3211 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3212 struct v4l2_ext_control c;
3215 if (ctrl == NULL || !ctrl->is_int)
3218 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3221 c.value = control->value;
3222 ret = set_ctrl_lock(fh, ctrl, &c);
3223 control->value = c.value;
3226 EXPORT_SYMBOL(v4l2_s_ctrl);
3228 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
3230 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
3232 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
3234 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3236 lockdep_assert_held(ctrl->handler->lock);
3238 /* It's a driver bug if this happens. */
3239 WARN_ON(!ctrl->is_int);
3241 return set_ctrl(NULL, ctrl, NULL, 0);
3243 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3245 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3247 lockdep_assert_held(ctrl->handler->lock);
3249 /* It's a driver bug if this happens. */
3250 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3251 *ctrl->p_new.p_s64 = val;
3252 return set_ctrl(NULL, ctrl, NULL, 0);
3254 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3256 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3258 lockdep_assert_held(ctrl->handler->lock);
3260 /* It's a driver bug if this happens. */
3261 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3262 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3263 return set_ctrl(NULL, ctrl, NULL, 0);
3265 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3267 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3271 if (notify == NULL) {
3272 ctrl->call_notify = 0;
3275 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3277 ctrl->handler->notify = notify;
3278 ctrl->handler->notify_priv = priv;
3279 ctrl->call_notify = 1;
3281 EXPORT_SYMBOL(v4l2_ctrl_notify);
3283 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3284 s64 min, s64 max, u64 step, s64 def)
3287 struct v4l2_ext_control c;
3289 lockdep_assert_held(ctrl->handler->lock);
3291 switch (ctrl->type) {
3292 case V4L2_CTRL_TYPE_INTEGER:
3293 case V4L2_CTRL_TYPE_INTEGER64:
3294 case V4L2_CTRL_TYPE_BOOLEAN:
3295 case V4L2_CTRL_TYPE_MENU:
3296 case V4L2_CTRL_TYPE_INTEGER_MENU:
3297 case V4L2_CTRL_TYPE_BITMASK:
3298 case V4L2_CTRL_TYPE_U8:
3299 case V4L2_CTRL_TYPE_U16:
3300 case V4L2_CTRL_TYPE_U32:
3303 ret = check_range(ctrl->type, min, max, step, def);
3310 ctrl->minimum = min;
3311 ctrl->maximum = max;
3313 ctrl->default_value = def;
3314 c.value = *ctrl->p_cur.p_s32;
3315 if (validate_new(ctrl, &c))
3317 if (c.value != *ctrl->p_cur.p_s32)
3318 ret = set_ctrl(NULL, ctrl, &c, V4L2_EVENT_CTRL_CH_RANGE);
3320 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3323 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3325 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3327 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3332 v4l2_ctrl_lock(ctrl);
3333 list_add_tail(&sev->node, &ctrl->ev_subs);
3334 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3335 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3336 struct v4l2_event ev;
3337 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3339 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3340 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3341 fill_event(&ev, ctrl, changes);
3342 /* Mark the queue as active, allowing this initial
3343 event to be accepted. */
3345 v4l2_event_queue_fh(sev->fh, &ev);
3347 v4l2_ctrl_unlock(ctrl);
3351 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3353 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3355 v4l2_ctrl_lock(ctrl);
3356 list_del(&sev->node);
3357 v4l2_ctrl_unlock(ctrl);
3360 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3362 u32 old_changes = old->u.ctrl.changes;
3364 old->u.ctrl = new->u.ctrl;
3365 old->u.ctrl.changes |= old_changes;
3367 EXPORT_SYMBOL(v4l2_ctrl_replace);
3369 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3371 new->u.ctrl.changes |= old->u.ctrl.changes;
3373 EXPORT_SYMBOL(v4l2_ctrl_merge);
3375 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3376 .add = v4l2_ctrl_add_event,
3377 .del = v4l2_ctrl_del_event,
3378 .replace = v4l2_ctrl_replace,
3379 .merge = v4l2_ctrl_merge,
3381 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3383 int v4l2_ctrl_log_status(struct file *file, void *fh)
3385 struct video_device *vfd = video_devdata(file);
3386 struct v4l2_fh *vfh = file->private_data;
3388 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3389 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3390 vfd->v4l2_dev->name);
3393 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3395 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3396 const struct v4l2_event_subscription *sub)
3398 if (sub->type == V4L2_EVENT_CTRL)
3399 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3402 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3404 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3405 struct v4l2_event_subscription *sub)
3407 if (!sd->ctrl_handler)
3409 return v4l2_ctrl_subscribe_event(fh, sub);
3411 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3413 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3415 struct v4l2_fh *fh = file->private_data;
3417 if (v4l2_event_pending(fh))
3419 poll_wait(file, &fh->wait, wait);
3422 EXPORT_SYMBOL(v4l2_ctrl_poll);
projects / firefly-linux-kernel-4.4.55.git / blob