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>
23 #include <linux/slab.h>
24 #include <linux/export.h>
25 #include <media/v4l2-ioctl.h>
26 #include <media/v4l2-device.h>
27 #include <media/v4l2-ctrls.h>
28 #include <media/v4l2-event.h>
29 #include <media/v4l2-dev.h>
31 #define has_op(master, op) \
32 (master->ops && master->ops->op)
33 #define call_op(master, op) \
34 (has_op(master, op) ? master->ops->op(master) : 0)
36 /* Internal temporary helper struct, one for each v4l2_ext_control */
37 struct v4l2_ctrl_helper {
38 /* Pointer to the control reference of the master control */
39 struct v4l2_ctrl_ref *mref;
40 /* The control corresponding to the v4l2_ext_control ID field. */
41 struct v4l2_ctrl *ctrl;
42 /* v4l2_ext_control index of the next control belonging to the
43 same cluster, or 0 if there isn't any. */
47 /* Small helper function to determine if the autocluster is set to manual
49 static bool is_cur_manual(const struct v4l2_ctrl *master)
51 return master->is_auto && master->cur.val == master->manual_mode_value;
54 /* Same as above, but this checks the against the new value instead of the
56 static bool is_new_manual(const struct v4l2_ctrl *master)
58 return master->is_auto && master->val == master->manual_mode_value;
61 /* Returns NULL or a character pointer array containing the menu for
62 the given control ID. The pointer array ends with a NULL pointer.
63 An empty string signifies a menu entry that is invalid. This allows
64 drivers to disable certain options if it is not supported. */
65 const char * const *v4l2_ctrl_get_menu(u32 id)
67 static const char * const mpeg_audio_sampling_freq[] = {
73 static const char * const mpeg_audio_encoding[] = {
81 static const char * const mpeg_audio_l1_bitrate[] = {
98 static const char * const mpeg_audio_l2_bitrate[] = {
115 static const char * const mpeg_audio_l3_bitrate[] = {
132 static const char * const mpeg_audio_ac3_bitrate[] = {
154 static const char * const mpeg_audio_mode[] = {
161 static const char * const mpeg_audio_mode_extension[] = {
168 static const char * const mpeg_audio_emphasis[] = {
174 static const char * const mpeg_audio_crc[] = {
179 static const char * const mpeg_audio_dec_playback[] = {
188 static const char * const mpeg_video_encoding[] = {
194 static const char * const mpeg_video_aspect[] = {
201 static const char * const mpeg_video_bitrate_mode[] = {
206 static const char * const mpeg_stream_type[] = {
207 "MPEG-2 Program Stream",
208 "MPEG-2 Transport Stream",
209 "MPEG-1 System Stream",
210 "MPEG-2 DVD-compatible Stream",
211 "MPEG-1 VCD-compatible Stream",
212 "MPEG-2 SVCD-compatible Stream",
215 static const char * const mpeg_stream_vbi_fmt[] = {
217 "Private Packet, IVTV Format",
220 static const char * const camera_power_line_frequency[] = {
227 static const char * const camera_exposure_auto[] = {
230 "Shutter Priority Mode",
231 "Aperture Priority Mode",
234 static const char * const camera_exposure_metering[] = {
241 static const char * const camera_auto_focus_range[] = {
248 static const char * const colorfx[] = {
267 static const char * const auto_n_preset_white_balance[] = {
280 static const char * const camera_iso_sensitivity_auto[] = {
285 static const char * const scene_mode[] = {
302 static const char * const tune_emphasis[] = {
308 static const char * const header_mode[] = {
310 "Joined With 1st Frame",
313 static const char * const multi_slice[] = {
319 static const char * const entropy_mode[] = {
324 static const char * const mpeg_h264_level[] = {
343 static const char * const h264_loop_filter[] = {
346 "Disabled at Slice Boundary",
349 static const char * const h264_profile[] = {
351 "Constrained Baseline",
357 "High 444 Predictive",
364 "Scalable High Intra",
369 static const char * const vui_sar_idc[] = {
390 static const char * const h264_fp_arrangement_type[] = {
399 static const char * const h264_fmo_map_type[] = {
400 "Interleaved Slices",
402 "Foreground with Leftover",
409 static const char * const mpeg_mpeg4_level[] = {
420 static const char * const mpeg4_profile[] = {
425 "Advanced Coding Efficiency",
429 static const char * const vpx_golden_frame_sel[] = {
430 "Use Previous Frame",
431 "Use Previous Specific Frame",
435 static const char * const flash_led_mode[] = {
441 static const char * const flash_strobe_source[] = {
447 static const char * const jpeg_chroma_subsampling[] = {
456 static const char * const dv_tx_mode[] = {
461 static const char * const dv_rgb_range[] = {
463 "RGB Limited Range (16-235)",
464 "RGB Full Range (0-255)",
467 static const char * const dv_it_content_type[] = {
475 static const char * const detect_md_mode[] = {
485 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
486 return mpeg_audio_sampling_freq;
487 case V4L2_CID_MPEG_AUDIO_ENCODING:
488 return mpeg_audio_encoding;
489 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
490 return mpeg_audio_l1_bitrate;
491 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
492 return mpeg_audio_l2_bitrate;
493 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
494 return mpeg_audio_l3_bitrate;
495 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
496 return mpeg_audio_ac3_bitrate;
497 case V4L2_CID_MPEG_AUDIO_MODE:
498 return mpeg_audio_mode;
499 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
500 return mpeg_audio_mode_extension;
501 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
502 return mpeg_audio_emphasis;
503 case V4L2_CID_MPEG_AUDIO_CRC:
504 return mpeg_audio_crc;
505 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
506 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
507 return mpeg_audio_dec_playback;
508 case V4L2_CID_MPEG_VIDEO_ENCODING:
509 return mpeg_video_encoding;
510 case V4L2_CID_MPEG_VIDEO_ASPECT:
511 return mpeg_video_aspect;
512 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
513 return mpeg_video_bitrate_mode;
514 case V4L2_CID_MPEG_STREAM_TYPE:
515 return mpeg_stream_type;
516 case V4L2_CID_MPEG_STREAM_VBI_FMT:
517 return mpeg_stream_vbi_fmt;
518 case V4L2_CID_POWER_LINE_FREQUENCY:
519 return camera_power_line_frequency;
520 case V4L2_CID_EXPOSURE_AUTO:
521 return camera_exposure_auto;
522 case V4L2_CID_EXPOSURE_METERING:
523 return camera_exposure_metering;
524 case V4L2_CID_AUTO_FOCUS_RANGE:
525 return camera_auto_focus_range;
526 case V4L2_CID_COLORFX:
528 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
529 return auto_n_preset_white_balance;
530 case V4L2_CID_ISO_SENSITIVITY_AUTO:
531 return camera_iso_sensitivity_auto;
532 case V4L2_CID_SCENE_MODE:
534 case V4L2_CID_TUNE_PREEMPHASIS:
535 return tune_emphasis;
536 case V4L2_CID_TUNE_DEEMPHASIS:
537 return tune_emphasis;
538 case V4L2_CID_FLASH_LED_MODE:
539 return flash_led_mode;
540 case V4L2_CID_FLASH_STROBE_SOURCE:
541 return flash_strobe_source;
542 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
544 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
546 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
548 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
549 return mpeg_h264_level;
550 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
551 return h264_loop_filter;
552 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
554 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
556 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
557 return h264_fp_arrangement_type;
558 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
559 return h264_fmo_map_type;
560 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
561 return mpeg_mpeg4_level;
562 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
563 return mpeg4_profile;
564 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
565 return vpx_golden_frame_sel;
566 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
567 return jpeg_chroma_subsampling;
568 case V4L2_CID_DV_TX_MODE:
570 case V4L2_CID_DV_TX_RGB_RANGE:
571 case V4L2_CID_DV_RX_RGB_RANGE:
573 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
574 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
575 return dv_it_content_type;
576 case V4L2_CID_DETECT_MD_MODE:
577 return detect_md_mode;
583 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
585 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
587 * Returns NULL or an s64 type array containing the menu for given
588 * control ID. The total number of the menu items is returned in @len.
590 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
592 static const s64 qmenu_int_vpx_num_partitions[] = {
596 static const s64 qmenu_int_vpx_num_ref_frames[] = {
601 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
602 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
603 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
604 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
610 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
612 /* Return the control name. */
613 const char *v4l2_ctrl_get_name(u32 id)
617 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
618 case V4L2_CID_USER_CLASS: return "User Controls";
619 case V4L2_CID_BRIGHTNESS: return "Brightness";
620 case V4L2_CID_CONTRAST: return "Contrast";
621 case V4L2_CID_SATURATION: return "Saturation";
622 case V4L2_CID_HUE: return "Hue";
623 case V4L2_CID_AUDIO_VOLUME: return "Volume";
624 case V4L2_CID_AUDIO_BALANCE: return "Balance";
625 case V4L2_CID_AUDIO_BASS: return "Bass";
626 case V4L2_CID_AUDIO_TREBLE: return "Treble";
627 case V4L2_CID_AUDIO_MUTE: return "Mute";
628 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
629 case V4L2_CID_BLACK_LEVEL: return "Black Level";
630 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
631 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
632 case V4L2_CID_RED_BALANCE: return "Red Balance";
633 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
634 case V4L2_CID_GAMMA: return "Gamma";
635 case V4L2_CID_EXPOSURE: return "Exposure";
636 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
637 case V4L2_CID_GAIN: return "Gain";
638 case V4L2_CID_HFLIP: return "Horizontal Flip";
639 case V4L2_CID_VFLIP: return "Vertical Flip";
640 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
641 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
642 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
643 case V4L2_CID_SHARPNESS: return "Sharpness";
644 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
645 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
646 case V4L2_CID_COLOR_KILLER: return "Color Killer";
647 case V4L2_CID_COLORFX: return "Color Effects";
648 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
649 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
650 case V4L2_CID_ROTATE: return "Rotate";
651 case V4L2_CID_BG_COLOR: return "Background Color";
652 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
653 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
654 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
655 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
656 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
657 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
658 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
661 /* The MPEG controls are applicable to all codec controls
662 * and the 'MPEG' part of the define is historical */
663 /* Keep the order of the 'case's the same as in videodev2.h! */
664 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
665 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
666 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
667 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
668 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
669 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
670 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
671 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
672 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
673 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
674 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
675 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
676 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
677 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
678 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
679 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
680 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
681 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
682 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
683 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
684 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
685 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
686 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
687 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
688 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
689 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
690 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
691 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
692 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
693 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
694 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
695 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
696 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
697 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
698 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
699 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
700 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
701 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
702 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
703 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
704 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
705 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
706 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
707 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
708 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
709 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
710 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
711 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
712 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
713 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
714 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
715 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
716 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
717 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
718 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
719 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
720 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
721 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
722 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
723 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
724 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
725 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
726 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
727 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
728 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
729 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
730 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
731 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
732 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
733 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
734 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
735 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
736 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
737 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
738 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
739 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
740 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
741 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
742 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
743 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
744 return "H264 Set QP Value for HC Layers";
745 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
746 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
747 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
748 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
749 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
750 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
751 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
752 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
753 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
754 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
755 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
756 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
757 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
758 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
759 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
760 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
761 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
762 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
763 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
766 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
767 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
768 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
769 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
770 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
771 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
772 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
773 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
774 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
775 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
776 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
777 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
779 /* CAMERA controls */
780 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
781 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
782 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
783 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
784 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
785 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
786 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
787 case V4L2_CID_PAN_RESET: return "Pan, Reset";
788 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
789 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
790 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
791 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
792 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
793 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
794 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
795 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
796 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
797 case V4L2_CID_PRIVACY: return "Privacy";
798 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
799 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
800 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
801 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
802 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
803 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
804 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
805 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
806 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
807 case V4L2_CID_SCENE_MODE: return "Scene Mode";
808 case V4L2_CID_3A_LOCK: return "3A Lock";
809 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
810 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
811 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
812 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
813 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
814 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
816 /* FM Radio Modulator controls */
817 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
818 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
819 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
820 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
821 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
822 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
823 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
824 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
825 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
826 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
827 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
828 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
829 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
830 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
831 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
832 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
833 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
834 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
835 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
836 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
837 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
838 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
839 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
840 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
841 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
842 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
843 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
844 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
845 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
846 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
849 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
850 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
851 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
852 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
853 case V4L2_CID_FLASH_STROBE: return "Strobe";
854 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
855 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
856 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
857 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
858 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
859 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
860 case V4L2_CID_FLASH_FAULT: return "Faults";
861 case V4L2_CID_FLASH_CHARGE: return "Charge";
862 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
864 /* JPEG encoder controls */
865 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
866 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
867 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
868 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
869 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
870 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
872 /* Image source controls */
873 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
874 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
875 case V4L2_CID_VBLANK: return "Vertical Blanking";
876 case V4L2_CID_HBLANK: return "Horizontal Blanking";
877 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
878 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
879 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
880 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
881 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
883 /* Image processing controls */
884 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
885 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
886 case V4L2_CID_LINK_FREQ: return "Link Frequency";
887 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
888 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
889 case V4L2_CID_DEINTERLACING_MODE: return "Deinterlacing Mode";
890 case V4L2_CID_DIGITAL_GAIN: return "Digital Gain";
893 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
894 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
895 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
896 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
897 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
898 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
899 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
900 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
901 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
902 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
903 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
905 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
906 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
907 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
908 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
909 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
910 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
911 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
912 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
913 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
914 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
915 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
916 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
917 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
918 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
919 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
920 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
921 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
922 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
923 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
924 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
926 /* Detection controls */
927 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
928 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
929 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
930 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
931 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
932 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
937 EXPORT_SYMBOL(v4l2_ctrl_get_name);
939 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
940 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
942 *name = v4l2_ctrl_get_name(id);
946 case V4L2_CID_AUDIO_MUTE:
947 case V4L2_CID_AUDIO_LOUDNESS:
948 case V4L2_CID_AUTO_WHITE_BALANCE:
949 case V4L2_CID_AUTOGAIN:
952 case V4L2_CID_HUE_AUTO:
953 case V4L2_CID_CHROMA_AGC:
954 case V4L2_CID_COLOR_KILLER:
955 case V4L2_CID_AUTOBRIGHTNESS:
956 case V4L2_CID_MPEG_AUDIO_MUTE:
957 case V4L2_CID_MPEG_VIDEO_MUTE:
958 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
959 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
960 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
961 case V4L2_CID_FOCUS_AUTO:
962 case V4L2_CID_PRIVACY:
963 case V4L2_CID_AUDIO_LIMITER_ENABLED:
964 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
965 case V4L2_CID_PILOT_TONE_ENABLED:
966 case V4L2_CID_ILLUMINATORS_1:
967 case V4L2_CID_ILLUMINATORS_2:
968 case V4L2_CID_FLASH_STROBE_STATUS:
969 case V4L2_CID_FLASH_CHARGE:
970 case V4L2_CID_FLASH_READY:
971 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
972 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
973 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
974 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
975 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
976 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
977 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
978 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
979 case V4L2_CID_WIDE_DYNAMIC_RANGE:
980 case V4L2_CID_IMAGE_STABILIZATION:
981 case V4L2_CID_RDS_RECEPTION:
982 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
983 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
984 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
985 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
986 case V4L2_CID_RF_TUNER_PLL_LOCK:
987 case V4L2_CID_RDS_TX_MONO_STEREO:
988 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
989 case V4L2_CID_RDS_TX_COMPRESSED:
990 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
991 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
992 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
993 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
994 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
995 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
996 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
997 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
998 *type = V4L2_CTRL_TYPE_BOOLEAN;
1002 case V4L2_CID_ROTATE:
1003 *type = V4L2_CTRL_TYPE_INTEGER;
1004 *flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
1006 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1007 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1008 *type = V4L2_CTRL_TYPE_INTEGER;
1010 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1011 case V4L2_CID_PAN_RESET:
1012 case V4L2_CID_TILT_RESET:
1013 case V4L2_CID_FLASH_STROBE:
1014 case V4L2_CID_FLASH_STROBE_STOP:
1015 case V4L2_CID_AUTO_FOCUS_START:
1016 case V4L2_CID_AUTO_FOCUS_STOP:
1017 case V4L2_CID_DO_WHITE_BALANCE:
1018 *type = V4L2_CTRL_TYPE_BUTTON;
1019 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1020 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1021 *min = *max = *step = *def = 0;
1023 case V4L2_CID_POWER_LINE_FREQUENCY:
1024 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1025 case V4L2_CID_MPEG_AUDIO_ENCODING:
1026 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1027 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1028 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1029 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1030 case V4L2_CID_MPEG_AUDIO_MODE:
1031 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1032 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1033 case V4L2_CID_MPEG_AUDIO_CRC:
1034 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1035 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1036 case V4L2_CID_MPEG_VIDEO_ENCODING:
1037 case V4L2_CID_MPEG_VIDEO_ASPECT:
1038 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1039 case V4L2_CID_MPEG_STREAM_TYPE:
1040 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1041 case V4L2_CID_EXPOSURE_AUTO:
1042 case V4L2_CID_AUTO_FOCUS_RANGE:
1043 case V4L2_CID_COLORFX:
1044 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1045 case V4L2_CID_TUNE_PREEMPHASIS:
1046 case V4L2_CID_FLASH_LED_MODE:
1047 case V4L2_CID_FLASH_STROBE_SOURCE:
1048 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1049 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1050 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1051 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1052 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1053 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1054 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1055 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1056 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1057 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1058 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1059 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1060 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1061 case V4L2_CID_EXPOSURE_METERING:
1062 case V4L2_CID_SCENE_MODE:
1063 case V4L2_CID_DV_TX_MODE:
1064 case V4L2_CID_DV_TX_RGB_RANGE:
1065 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1066 case V4L2_CID_DV_RX_RGB_RANGE:
1067 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1068 case V4L2_CID_TEST_PATTERN:
1069 case V4L2_CID_DEINTERLACING_MODE:
1070 case V4L2_CID_TUNE_DEEMPHASIS:
1071 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1072 case V4L2_CID_DETECT_MD_MODE:
1073 *type = V4L2_CTRL_TYPE_MENU;
1075 case V4L2_CID_LINK_FREQ:
1076 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1078 case V4L2_CID_RDS_TX_PS_NAME:
1079 case V4L2_CID_RDS_TX_RADIO_TEXT:
1080 case V4L2_CID_RDS_RX_PS_NAME:
1081 case V4L2_CID_RDS_RX_RADIO_TEXT:
1082 *type = V4L2_CTRL_TYPE_STRING;
1084 case V4L2_CID_ISO_SENSITIVITY:
1085 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1086 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1087 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1088 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1090 case V4L2_CID_USER_CLASS:
1091 case V4L2_CID_CAMERA_CLASS:
1092 case V4L2_CID_MPEG_CLASS:
1093 case V4L2_CID_FM_TX_CLASS:
1094 case V4L2_CID_FLASH_CLASS:
1095 case V4L2_CID_JPEG_CLASS:
1096 case V4L2_CID_IMAGE_SOURCE_CLASS:
1097 case V4L2_CID_IMAGE_PROC_CLASS:
1098 case V4L2_CID_DV_CLASS:
1099 case V4L2_CID_FM_RX_CLASS:
1100 case V4L2_CID_RF_TUNER_CLASS:
1101 case V4L2_CID_DETECT_CLASS:
1102 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1103 /* You can neither read not write these */
1104 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1105 *min = *max = *step = *def = 0;
1107 case V4L2_CID_BG_COLOR:
1108 *type = V4L2_CTRL_TYPE_INTEGER;
1111 /* Max is calculated as RGB888 that is 2^24 */
1114 case V4L2_CID_FLASH_FAULT:
1115 case V4L2_CID_JPEG_ACTIVE_MARKER:
1116 case V4L2_CID_3A_LOCK:
1117 case V4L2_CID_AUTO_FOCUS_STATUS:
1118 case V4L2_CID_DV_TX_HOTPLUG:
1119 case V4L2_CID_DV_TX_RXSENSE:
1120 case V4L2_CID_DV_TX_EDID_PRESENT:
1121 case V4L2_CID_DV_RX_POWER_PRESENT:
1122 *type = V4L2_CTRL_TYPE_BITMASK;
1124 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1125 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1126 *type = V4L2_CTRL_TYPE_INTEGER;
1127 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1129 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1130 *type = V4L2_CTRL_TYPE_INTEGER64;
1131 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1133 *max = 0x1ffffffffLL;
1136 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1137 *type = V4L2_CTRL_TYPE_INTEGER64;
1138 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1140 *max = 0x7fffffffffffffffLL;
1143 case V4L2_CID_PIXEL_RATE:
1144 *type = V4L2_CTRL_TYPE_INTEGER64;
1145 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1147 case V4L2_CID_DETECT_MD_REGION_GRID:
1148 *type = V4L2_CTRL_TYPE_U8;
1150 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1151 *type = V4L2_CTRL_TYPE_U16;
1153 case V4L2_CID_RDS_TX_ALT_FREQS:
1154 *type = V4L2_CTRL_TYPE_U32;
1157 *type = V4L2_CTRL_TYPE_INTEGER;
1161 case V4L2_CID_MPEG_AUDIO_ENCODING:
1162 case V4L2_CID_MPEG_AUDIO_MODE:
1163 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1164 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1165 case V4L2_CID_MPEG_STREAM_TYPE:
1166 *flags |= V4L2_CTRL_FLAG_UPDATE;
1168 case V4L2_CID_AUDIO_VOLUME:
1169 case V4L2_CID_AUDIO_BALANCE:
1170 case V4L2_CID_AUDIO_BASS:
1171 case V4L2_CID_AUDIO_TREBLE:
1172 case V4L2_CID_BRIGHTNESS:
1173 case V4L2_CID_CONTRAST:
1174 case V4L2_CID_SATURATION:
1176 case V4L2_CID_RED_BALANCE:
1177 case V4L2_CID_BLUE_BALANCE:
1178 case V4L2_CID_GAMMA:
1179 case V4L2_CID_SHARPNESS:
1180 case V4L2_CID_CHROMA_GAIN:
1181 case V4L2_CID_RDS_TX_DEVIATION:
1182 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1183 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1184 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1185 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1186 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1187 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1188 case V4L2_CID_PILOT_TONE_DEVIATION:
1189 case V4L2_CID_PILOT_TONE_FREQUENCY:
1190 case V4L2_CID_TUNE_POWER_LEVEL:
1191 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1192 case V4L2_CID_RF_TUNER_RF_GAIN:
1193 case V4L2_CID_RF_TUNER_LNA_GAIN:
1194 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1195 case V4L2_CID_RF_TUNER_IF_GAIN:
1196 case V4L2_CID_RF_TUNER_BANDWIDTH:
1197 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1198 *flags |= V4L2_CTRL_FLAG_SLIDER;
1200 case V4L2_CID_PAN_RELATIVE:
1201 case V4L2_CID_TILT_RELATIVE:
1202 case V4L2_CID_FOCUS_RELATIVE:
1203 case V4L2_CID_IRIS_RELATIVE:
1204 case V4L2_CID_ZOOM_RELATIVE:
1205 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1206 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1208 case V4L2_CID_FLASH_STROBE_STATUS:
1209 case V4L2_CID_AUTO_FOCUS_STATUS:
1210 case V4L2_CID_FLASH_READY:
1211 case V4L2_CID_DV_TX_HOTPLUG:
1212 case V4L2_CID_DV_TX_RXSENSE:
1213 case V4L2_CID_DV_TX_EDID_PRESENT:
1214 case V4L2_CID_DV_RX_POWER_PRESENT:
1215 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1216 case V4L2_CID_RDS_RX_PTY:
1217 case V4L2_CID_RDS_RX_PS_NAME:
1218 case V4L2_CID_RDS_RX_RADIO_TEXT:
1219 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1220 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1221 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1222 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1224 case V4L2_CID_RF_TUNER_PLL_LOCK:
1225 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1229 EXPORT_SYMBOL(v4l2_ctrl_fill);
1231 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1233 u32 flags = ctrl->flags;
1236 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1241 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1243 memset(ev, 0, sizeof(*ev));
1244 ev->type = V4L2_EVENT_CTRL;
1246 ev->u.ctrl.changes = changes;
1247 ev->u.ctrl.type = ctrl->type;
1248 ev->u.ctrl.flags = user_flags(ctrl);
1250 ev->u.ctrl.value64 = 0;
1252 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1253 ev->u.ctrl.minimum = ctrl->minimum;
1254 ev->u.ctrl.maximum = ctrl->maximum;
1255 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1256 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1257 ev->u.ctrl.step = 1;
1259 ev->u.ctrl.step = ctrl->step;
1260 ev->u.ctrl.default_value = ctrl->default_value;
1263 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1265 struct v4l2_event ev;
1266 struct v4l2_subscribed_event *sev;
1268 if (list_empty(&ctrl->ev_subs))
1270 fill_event(&ev, ctrl, changes);
1272 list_for_each_entry(sev, &ctrl->ev_subs, node)
1273 if (sev->fh != fh ||
1274 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1275 v4l2_event_queue_fh(sev->fh, &ev);
1278 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1279 union v4l2_ctrl_ptr ptr1,
1280 union v4l2_ctrl_ptr ptr2)
1282 switch (ctrl->type) {
1283 case V4L2_CTRL_TYPE_BUTTON:
1285 case V4L2_CTRL_TYPE_STRING:
1286 idx *= ctrl->elem_size;
1287 /* strings are always 0-terminated */
1288 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1289 case V4L2_CTRL_TYPE_INTEGER64:
1290 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1291 case V4L2_CTRL_TYPE_U8:
1292 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1293 case V4L2_CTRL_TYPE_U16:
1294 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1295 case V4L2_CTRL_TYPE_U32:
1296 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1299 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1300 idx *= ctrl->elem_size;
1301 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1305 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1306 union v4l2_ctrl_ptr ptr)
1308 switch (ctrl->type) {
1309 case V4L2_CTRL_TYPE_STRING:
1310 idx *= ctrl->elem_size;
1311 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1312 ptr.p_char[idx + ctrl->minimum] = '\0';
1314 case V4L2_CTRL_TYPE_INTEGER64:
1315 ptr.p_s64[idx] = ctrl->default_value;
1317 case V4L2_CTRL_TYPE_INTEGER:
1318 case V4L2_CTRL_TYPE_INTEGER_MENU:
1319 case V4L2_CTRL_TYPE_MENU:
1320 case V4L2_CTRL_TYPE_BITMASK:
1321 case V4L2_CTRL_TYPE_BOOLEAN:
1322 ptr.p_s32[idx] = ctrl->default_value;
1324 case V4L2_CTRL_TYPE_U8:
1325 ptr.p_u8[idx] = ctrl->default_value;
1327 case V4L2_CTRL_TYPE_U16:
1328 ptr.p_u16[idx] = ctrl->default_value;
1330 case V4L2_CTRL_TYPE_U32:
1331 ptr.p_u32[idx] = ctrl->default_value;
1334 idx *= ctrl->elem_size;
1335 memset(ptr.p + idx, 0, ctrl->elem_size);
1340 static void std_log(const struct v4l2_ctrl *ctrl)
1342 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1344 if (ctrl->is_array) {
1347 for (i = 0; i < ctrl->nr_of_dims; i++)
1348 pr_cont("[%u]", ctrl->dims[i]);
1352 switch (ctrl->type) {
1353 case V4L2_CTRL_TYPE_INTEGER:
1354 pr_cont("%d", *ptr.p_s32);
1356 case V4L2_CTRL_TYPE_BOOLEAN:
1357 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1359 case V4L2_CTRL_TYPE_MENU:
1360 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1362 case V4L2_CTRL_TYPE_INTEGER_MENU:
1363 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1365 case V4L2_CTRL_TYPE_BITMASK:
1366 pr_cont("0x%08x", *ptr.p_s32);
1368 case V4L2_CTRL_TYPE_INTEGER64:
1369 pr_cont("%lld", *ptr.p_s64);
1371 case V4L2_CTRL_TYPE_STRING:
1372 pr_cont("%s", ptr.p_char);
1374 case V4L2_CTRL_TYPE_U8:
1375 pr_cont("%u", (unsigned)*ptr.p_u8);
1377 case V4L2_CTRL_TYPE_U16:
1378 pr_cont("%u", (unsigned)*ptr.p_u16);
1380 case V4L2_CTRL_TYPE_U32:
1381 pr_cont("%u", (unsigned)*ptr.p_u32);
1384 pr_cont("unknown type %d", ctrl->type);
1390 * Round towards the closest legal value. Be careful when we are
1391 * close to the maximum range of the control type to prevent
1394 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1396 offset_type offset; \
1397 if ((ctrl)->maximum >= 0 && \
1398 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1399 val = (ctrl)->maximum; \
1401 val += (s32)((ctrl)->step / 2); \
1402 val = clamp_t(typeof(val), val, \
1403 (ctrl)->minimum, (ctrl)->maximum); \
1404 offset = (val) - (ctrl)->minimum; \
1405 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1406 val = (ctrl)->minimum + offset; \
1410 /* Validate a new control */
1411 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1412 union v4l2_ctrl_ptr ptr)
1418 switch (ctrl->type) {
1419 case V4L2_CTRL_TYPE_INTEGER:
1420 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1421 case V4L2_CTRL_TYPE_INTEGER64:
1423 * We can't use the ROUND_TO_RANGE define here due to
1424 * the u64 divide that needs special care.
1426 val = ptr.p_s64[idx];
1427 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1428 val = ctrl->maximum;
1430 val += (s64)(ctrl->step / 2);
1431 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1432 offset = val - ctrl->minimum;
1433 do_div(offset, ctrl->step);
1434 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1436 case V4L2_CTRL_TYPE_U8:
1437 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1438 case V4L2_CTRL_TYPE_U16:
1439 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1440 case V4L2_CTRL_TYPE_U32:
1441 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1443 case V4L2_CTRL_TYPE_BOOLEAN:
1444 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1447 case V4L2_CTRL_TYPE_MENU:
1448 case V4L2_CTRL_TYPE_INTEGER_MENU:
1449 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1451 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1453 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1454 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1458 case V4L2_CTRL_TYPE_BITMASK:
1459 ptr.p_s32[idx] &= ctrl->maximum;
1462 case V4L2_CTRL_TYPE_BUTTON:
1463 case V4L2_CTRL_TYPE_CTRL_CLASS:
1467 case V4L2_CTRL_TYPE_STRING:
1468 idx *= ctrl->elem_size;
1469 len = strlen(ptr.p_char + idx);
1470 if (len < ctrl->minimum)
1472 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1481 static const struct v4l2_ctrl_type_ops std_type_ops = {
1485 .validate = std_validate,
1488 /* Helper function: copy the given control value back to the caller */
1489 static int ptr_to_user(struct v4l2_ext_control *c,
1490 struct v4l2_ctrl *ctrl,
1491 union v4l2_ctrl_ptr ptr)
1495 if (ctrl->is_ptr && !ctrl->is_string)
1496 return copy_to_user(c->ptr, ptr.p, c->size) ?
1499 switch (ctrl->type) {
1500 case V4L2_CTRL_TYPE_STRING:
1501 len = strlen(ptr.p_char);
1502 if (c->size < len + 1) {
1503 c->size = ctrl->elem_size;
1506 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1508 case V4L2_CTRL_TYPE_INTEGER64:
1509 c->value64 = *ptr.p_s64;
1512 c->value = *ptr.p_s32;
1518 /* Helper function: copy the current control value back to the caller */
1519 static int cur_to_user(struct v4l2_ext_control *c,
1520 struct v4l2_ctrl *ctrl)
1522 return ptr_to_user(c, ctrl, ctrl->p_cur);
1525 /* Helper function: copy the new control value back to the caller */
1526 static int new_to_user(struct v4l2_ext_control *c,
1527 struct v4l2_ctrl *ctrl)
1529 return ptr_to_user(c, ctrl, ctrl->p_new);
1532 /* Helper function: copy the initial control value back to the caller */
1533 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1537 for (idx = 0; idx < ctrl->elems; idx++)
1538 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1540 return ptr_to_user(c, ctrl, ctrl->p_new);
1543 /* Helper function: copy the caller-provider value to the given control value */
1544 static int user_to_ptr(struct v4l2_ext_control *c,
1545 struct v4l2_ctrl *ctrl,
1546 union v4l2_ctrl_ptr ptr)
1552 if (ctrl->is_ptr && !ctrl->is_string) {
1555 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1556 if (ret || !ctrl->is_array)
1558 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1559 ctrl->type_ops->init(ctrl, idx, ptr);
1563 switch (ctrl->type) {
1564 case V4L2_CTRL_TYPE_INTEGER64:
1565 *ptr.p_s64 = c->value64;
1567 case V4L2_CTRL_TYPE_STRING:
1571 if (size > ctrl->maximum + 1)
1572 size = ctrl->maximum + 1;
1573 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1575 char last = ptr.p_char[size - 1];
1577 ptr.p_char[size - 1] = 0;
1578 /* If the string was longer than ctrl->maximum,
1579 then return an error. */
1580 if (strlen(ptr.p_char) == ctrl->maximum && last)
1585 *ptr.p_s32 = c->value;
1591 /* Helper function: copy the caller-provider value as the new control value */
1592 static int user_to_new(struct v4l2_ext_control *c,
1593 struct v4l2_ctrl *ctrl)
1595 return user_to_ptr(c, ctrl, ctrl->p_new);
1598 /* Copy the one value to another. */
1599 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1600 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1604 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1607 /* Copy the new value to the current value. */
1608 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1615 /* has_changed is set by cluster_changed */
1616 changed = ctrl->has_changed;
1618 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1620 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1621 /* Note: CH_FLAGS is only set for auto clusters. */
1623 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1624 if (!is_cur_manual(ctrl->cluster[0])) {
1625 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1626 if (ctrl->cluster[0]->has_volatiles)
1627 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1631 if (changed || ch_flags) {
1632 /* If a control was changed that was not one of the controls
1633 modified by the application, then send the event to all. */
1636 send_event(fh, ctrl,
1637 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1638 if (ctrl->call_notify && changed && ctrl->handler->notify)
1639 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1643 /* Copy the current value to the new value */
1644 static void cur_to_new(struct v4l2_ctrl *ctrl)
1648 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1651 /* Return non-zero if one or more of the controls in the cluster has a new
1652 value that differs from the current value. */
1653 static int cluster_changed(struct v4l2_ctrl *master)
1655 bool changed = false;
1659 for (i = 0; i < master->ncontrols; i++) {
1660 struct v4l2_ctrl *ctrl = master->cluster[i];
1661 bool ctrl_changed = false;
1666 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1667 changed = ctrl_changed = true;
1670 * Set has_changed to false to avoid generating
1671 * the event V4L2_EVENT_CTRL_CH_VALUE
1673 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1674 ctrl->has_changed = false;
1678 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1679 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1680 ctrl->p_cur, ctrl->p_new);
1681 ctrl->has_changed = ctrl_changed;
1682 changed |= ctrl->has_changed;
1687 /* Control range checking */
1688 static int check_range(enum v4l2_ctrl_type type,
1689 s64 min, s64 max, u64 step, s64 def)
1692 case V4L2_CTRL_TYPE_BOOLEAN:
1693 if (step != 1 || max > 1 || min < 0)
1696 case V4L2_CTRL_TYPE_U8:
1697 case V4L2_CTRL_TYPE_U16:
1698 case V4L2_CTRL_TYPE_U32:
1699 case V4L2_CTRL_TYPE_INTEGER:
1700 case V4L2_CTRL_TYPE_INTEGER64:
1701 if (step == 0 || min > max || def < min || def > max)
1704 case V4L2_CTRL_TYPE_BITMASK:
1705 if (step || min || !max || (def & ~max))
1708 case V4L2_CTRL_TYPE_MENU:
1709 case V4L2_CTRL_TYPE_INTEGER_MENU:
1710 if (min > max || def < min || def > max)
1712 /* Note: step == menu_skip_mask for menu controls.
1713 So here we check if the default value is masked out. */
1714 if (step && ((1 << def) & step))
1717 case V4L2_CTRL_TYPE_STRING:
1718 if (min > max || min < 0 || step < 1 || def)
1726 /* Validate a new control */
1727 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1732 for (idx = 0; !err && idx < ctrl->elems; idx++)
1733 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1737 static inline u32 node2id(struct list_head *node)
1739 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1742 /* Set the handler's error code if it wasn't set earlier already */
1743 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1745 if (hdl->error == 0)
1750 /* Initialize the handler */
1751 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1752 unsigned nr_of_controls_hint,
1753 struct lock_class_key *key, const char *name)
1755 mutex_init(&hdl->_lock);
1756 hdl->lock = &hdl->_lock;
1757 lockdep_set_class_and_name(hdl->lock, key, name);
1758 INIT_LIST_HEAD(&hdl->ctrls);
1759 INIT_LIST_HEAD(&hdl->ctrl_refs);
1760 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1761 hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
1762 sizeof(hdl->buckets[0]),
1763 GFP_KERNEL | __GFP_ZERO);
1764 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1767 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1769 /* Free all controls and control refs */
1770 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1772 struct v4l2_ctrl_ref *ref, *next_ref;
1773 struct v4l2_ctrl *ctrl, *next_ctrl;
1774 struct v4l2_subscribed_event *sev, *next_sev;
1776 if (hdl == NULL || hdl->buckets == NULL)
1779 mutex_lock(hdl->lock);
1780 /* Free all nodes */
1781 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1782 list_del(&ref->node);
1785 /* Free all controls owned by the handler */
1786 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1787 list_del(&ctrl->node);
1788 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1789 list_del(&sev->node);
1792 kvfree(hdl->buckets);
1793 hdl->buckets = NULL;
1796 mutex_unlock(hdl->lock);
1797 mutex_destroy(&hdl->_lock);
1799 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1801 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1802 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1803 with applications that do not use the NEXT_CTRL flag.
1805 We just find the n-th private user control. It's O(N), but that should not
1806 be an issue in this particular case. */
1807 static struct v4l2_ctrl_ref *find_private_ref(
1808 struct v4l2_ctrl_handler *hdl, u32 id)
1810 struct v4l2_ctrl_ref *ref;
1812 id -= V4L2_CID_PRIVATE_BASE;
1813 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1814 /* Search for private user controls that are compatible with
1816 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1817 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1818 if (!ref->ctrl->is_int)
1828 /* Find a control with the given ID. */
1829 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1831 struct v4l2_ctrl_ref *ref;
1834 id &= V4L2_CTRL_ID_MASK;
1836 /* Old-style private controls need special handling */
1837 if (id >= V4L2_CID_PRIVATE_BASE)
1838 return find_private_ref(hdl, id);
1839 bucket = id % hdl->nr_of_buckets;
1841 /* Simple optimization: cache the last control found */
1842 if (hdl->cached && hdl->cached->ctrl->id == id)
1845 /* Not in cache, search the hash */
1846 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1847 while (ref && ref->ctrl->id != id)
1851 hdl->cached = ref; /* cache it! */
1855 /* Find a control with the given ID. Take the handler's lock first. */
1856 static struct v4l2_ctrl_ref *find_ref_lock(
1857 struct v4l2_ctrl_handler *hdl, u32 id)
1859 struct v4l2_ctrl_ref *ref = NULL;
1862 mutex_lock(hdl->lock);
1863 ref = find_ref(hdl, id);
1864 mutex_unlock(hdl->lock);
1869 /* Find a control with the given ID. */
1870 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1872 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1874 return ref ? ref->ctrl : NULL;
1876 EXPORT_SYMBOL(v4l2_ctrl_find);
1878 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1879 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1880 struct v4l2_ctrl *ctrl)
1882 struct v4l2_ctrl_ref *ref;
1883 struct v4l2_ctrl_ref *new_ref;
1885 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
1886 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1889 * Automatically add the control class if it is not yet present and
1890 * the new control is not a compound control.
1892 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1893 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1894 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1900 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1902 return handler_set_err(hdl, -ENOMEM);
1903 new_ref->ctrl = ctrl;
1904 if (ctrl->handler == hdl) {
1905 /* By default each control starts in a cluster of its own.
1906 new_ref->ctrl is basically a cluster array with one
1907 element, so that's perfect to use as the cluster pointer.
1908 But only do this for the handler that owns the control. */
1909 ctrl->cluster = &new_ref->ctrl;
1910 ctrl->ncontrols = 1;
1913 INIT_LIST_HEAD(&new_ref->node);
1915 mutex_lock(hdl->lock);
1917 /* Add immediately at the end of the list if the list is empty, or if
1918 the last element in the list has a lower ID.
1919 This ensures that when elements are added in ascending order the
1920 insertion is an O(1) operation. */
1921 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1922 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1923 goto insert_in_hash;
1926 /* Find insert position in sorted list */
1927 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1928 if (ref->ctrl->id < id)
1930 /* Don't add duplicates */
1931 if (ref->ctrl->id == id) {
1935 list_add(&new_ref->node, ref->node.prev);
1940 /* Insert the control node in the hash */
1941 new_ref->next = hdl->buckets[bucket];
1942 hdl->buckets[bucket] = new_ref;
1945 mutex_unlock(hdl->lock);
1949 /* Add a new control */
1950 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1951 const struct v4l2_ctrl_ops *ops,
1952 const struct v4l2_ctrl_type_ops *type_ops,
1953 u32 id, const char *name, enum v4l2_ctrl_type type,
1954 s64 min, s64 max, u64 step, s64 def,
1955 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1956 u32 flags, const char * const *qmenu,
1957 const s64 *qmenu_int, void *priv)
1959 struct v4l2_ctrl *ctrl;
1961 unsigned nr_of_dims = 0;
1964 unsigned tot_ctrl_size;
1972 while (dims && dims[nr_of_dims]) {
1973 elems *= dims[nr_of_dims];
1975 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1978 is_array = nr_of_dims > 0;
1980 /* Prefill elem_size for all types handled by std_type_ops */
1982 case V4L2_CTRL_TYPE_INTEGER64:
1983 elem_size = sizeof(s64);
1985 case V4L2_CTRL_TYPE_STRING:
1986 elem_size = max + 1;
1988 case V4L2_CTRL_TYPE_U8:
1989 elem_size = sizeof(u8);
1991 case V4L2_CTRL_TYPE_U16:
1992 elem_size = sizeof(u16);
1994 case V4L2_CTRL_TYPE_U32:
1995 elem_size = sizeof(u32);
1998 if (type < V4L2_CTRL_COMPOUND_TYPES)
1999 elem_size = sizeof(s32);
2002 tot_ctrl_size = elem_size * elems;
2005 if (id == 0 || name == NULL || !elem_size ||
2006 id >= V4L2_CID_PRIVATE_BASE ||
2007 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2008 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2009 handler_set_err(hdl, -ERANGE);
2012 err = check_range(type, min, max, step, def);
2014 handler_set_err(hdl, err);
2017 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
2018 handler_set_err(hdl, -ERANGE);
2022 (type == V4L2_CTRL_TYPE_BUTTON ||
2023 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2024 handler_set_err(hdl, -EINVAL);
2029 if (type == V4L2_CTRL_TYPE_BUTTON)
2030 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2031 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2032 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2033 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2034 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2035 type == V4L2_CTRL_TYPE_STRING ||
2036 type >= V4L2_CTRL_COMPOUND_TYPES ||
2038 sz_extra += 2 * tot_ctrl_size;
2040 ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2042 handler_set_err(hdl, -ENOMEM);
2046 INIT_LIST_HEAD(&ctrl->node);
2047 INIT_LIST_HEAD(&ctrl->ev_subs);
2048 ctrl->handler = hdl;
2050 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2054 ctrl->flags = flags;
2055 ctrl->minimum = min;
2056 ctrl->maximum = max;
2058 ctrl->default_value = def;
2059 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2060 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2061 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2062 ctrl->is_array = is_array;
2063 ctrl->elems = elems;
2064 ctrl->nr_of_dims = nr_of_dims;
2066 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2067 ctrl->elem_size = elem_size;
2068 if (type == V4L2_CTRL_TYPE_MENU)
2069 ctrl->qmenu = qmenu;
2070 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2071 ctrl->qmenu_int = qmenu_int;
2073 ctrl->cur.val = ctrl->val = def;
2076 if (!ctrl->is_int) {
2077 ctrl->p_new.p = data;
2078 ctrl->p_cur.p = data + tot_ctrl_size;
2080 ctrl->p_new.p = &ctrl->val;
2081 ctrl->p_cur.p = &ctrl->cur.val;
2083 for (idx = 0; idx < elems; idx++) {
2084 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2085 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2088 if (handler_new_ref(hdl, ctrl)) {
2092 mutex_lock(hdl->lock);
2093 list_add_tail(&ctrl->node, &hdl->ctrls);
2094 mutex_unlock(hdl->lock);
2098 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2099 const struct v4l2_ctrl_config *cfg, void *priv)
2102 struct v4l2_ctrl *ctrl;
2103 const char *name = cfg->name;
2104 const char * const *qmenu = cfg->qmenu;
2105 const s64 *qmenu_int = cfg->qmenu_int;
2106 enum v4l2_ctrl_type type = cfg->type;
2107 u32 flags = cfg->flags;
2110 u64 step = cfg->step;
2114 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2117 is_menu = (type == V4L2_CTRL_TYPE_MENU ||
2118 type == V4L2_CTRL_TYPE_INTEGER_MENU);
2122 WARN_ON(cfg->menu_skip_mask);
2123 if (type == V4L2_CTRL_TYPE_MENU && !qmenu) {
2124 qmenu = v4l2_ctrl_get_menu(cfg->id);
2125 } else if (type == V4L2_CTRL_TYPE_INTEGER_MENU && !qmenu_int) {
2126 handler_set_err(hdl, -EINVAL);
2130 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2132 is_menu ? cfg->menu_skip_mask : step, def,
2133 cfg->dims, cfg->elem_size,
2134 flags, qmenu, qmenu_int, priv);
2136 ctrl->is_private = cfg->is_private;
2139 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2141 /* Helper function for standard non-menu controls */
2142 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2143 const struct v4l2_ctrl_ops *ops,
2144 u32 id, s64 min, s64 max, u64 step, s64 def)
2147 enum v4l2_ctrl_type type;
2150 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2151 if (type == V4L2_CTRL_TYPE_MENU ||
2152 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2153 type >= V4L2_CTRL_COMPOUND_TYPES) {
2154 handler_set_err(hdl, -EINVAL);
2157 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2158 min, max, step, def, NULL, 0,
2159 flags, NULL, NULL, NULL);
2161 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2163 /* Helper function for standard menu controls */
2164 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2165 const struct v4l2_ctrl_ops *ops,
2166 u32 id, u8 _max, u64 mask, u8 _def)
2168 const char * const *qmenu = NULL;
2169 const s64 *qmenu_int = NULL;
2170 unsigned int qmenu_int_len = 0;
2172 enum v4l2_ctrl_type type;
2179 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2181 if (type == V4L2_CTRL_TYPE_MENU)
2182 qmenu = v4l2_ctrl_get_menu(id);
2183 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2184 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2186 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2187 handler_set_err(hdl, -EINVAL);
2190 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2191 0, max, mask, def, NULL, 0,
2192 flags, qmenu, qmenu_int, NULL);
2194 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2196 /* Helper function for standard menu controls with driver defined menu */
2197 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2198 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2199 u64 mask, u8 _def, const char * const *qmenu)
2201 enum v4l2_ctrl_type type;
2209 /* v4l2_ctrl_new_std_menu_items() should only be called for
2210 * standard controls without a standard menu.
2212 if (v4l2_ctrl_get_menu(id)) {
2213 handler_set_err(hdl, -EINVAL);
2217 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2218 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2219 handler_set_err(hdl, -EINVAL);
2222 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2223 0, max, mask, def, NULL, 0,
2224 flags, qmenu, NULL, NULL);
2227 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2229 /* Helper function for standard integer menu controls */
2230 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2231 const struct v4l2_ctrl_ops *ops,
2232 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2235 enum v4l2_ctrl_type type;
2242 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2243 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2244 handler_set_err(hdl, -EINVAL);
2247 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2248 0, max, 0, def, NULL, 0,
2249 flags, NULL, qmenu_int, NULL);
2251 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2253 /* Add the controls from another handler to our own. */
2254 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2255 struct v4l2_ctrl_handler *add,
2256 bool (*filter)(const struct v4l2_ctrl *ctrl))
2258 struct v4l2_ctrl_ref *ref;
2261 /* Do nothing if either handler is NULL or if they are the same */
2262 if (!hdl || !add || hdl == add)
2266 mutex_lock(add->lock);
2267 list_for_each_entry(ref, &add->ctrl_refs, node) {
2268 struct v4l2_ctrl *ctrl = ref->ctrl;
2270 /* Skip handler-private controls. */
2271 if (ctrl->is_private)
2273 /* And control classes */
2274 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2276 /* Filter any unwanted controls */
2277 if (filter && !filter(ctrl))
2279 ret = handler_new_ref(hdl, ctrl);
2283 mutex_unlock(add->lock);
2286 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2288 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2290 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2292 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2295 case V4L2_CID_AUDIO_MUTE:
2296 case V4L2_CID_AUDIO_VOLUME:
2297 case V4L2_CID_AUDIO_BALANCE:
2298 case V4L2_CID_AUDIO_BASS:
2299 case V4L2_CID_AUDIO_TREBLE:
2300 case V4L2_CID_AUDIO_LOUDNESS:
2307 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2309 /* Cluster controls */
2310 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2312 bool has_volatiles = false;
2315 /* The first control is the master control and it must not be NULL */
2316 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2319 for (i = 0; i < ncontrols; i++) {
2321 controls[i]->cluster = controls;
2322 controls[i]->ncontrols = ncontrols;
2323 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2324 has_volatiles = true;
2327 controls[0]->has_volatiles = has_volatiles;
2329 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2331 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2332 u8 manual_val, bool set_volatile)
2334 struct v4l2_ctrl *master = controls[0];
2338 v4l2_ctrl_cluster(ncontrols, controls);
2339 WARN_ON(ncontrols <= 1);
2340 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2341 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2342 master->is_auto = true;
2343 master->has_volatiles = set_volatile;
2344 master->manual_mode_value = manual_val;
2345 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2347 if (!is_cur_manual(master))
2348 flag = V4L2_CTRL_FLAG_INACTIVE |
2349 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2351 for (i = 1; i < ncontrols; i++)
2353 controls[i]->flags |= flag;
2355 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2357 /* Activate/deactivate a control. */
2358 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2360 /* invert since the actual flag is called 'inactive' */
2361 bool inactive = !active;
2368 /* set V4L2_CTRL_FLAG_INACTIVE */
2369 old = test_and_set_bit(4, &ctrl->flags);
2371 /* clear V4L2_CTRL_FLAG_INACTIVE */
2372 old = test_and_clear_bit(4, &ctrl->flags);
2373 if (old != inactive)
2374 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2376 EXPORT_SYMBOL(v4l2_ctrl_activate);
2378 /* Grab/ungrab a control.
2379 Typically used when streaming starts and you want to grab controls,
2380 preventing the user from changing them.
2382 Just call this and the framework will block any attempts to change
2384 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2391 v4l2_ctrl_lock(ctrl);
2393 /* set V4L2_CTRL_FLAG_GRABBED */
2394 old = test_and_set_bit(1, &ctrl->flags);
2396 /* clear V4L2_CTRL_FLAG_GRABBED */
2397 old = test_and_clear_bit(1, &ctrl->flags);
2399 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2400 v4l2_ctrl_unlock(ctrl);
2402 EXPORT_SYMBOL(v4l2_ctrl_grab);
2404 /* Log the control name and value */
2405 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2406 const char *prefix, const char *colon)
2408 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2410 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2413 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2415 ctrl->type_ops->log(ctrl);
2417 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2418 V4L2_CTRL_FLAG_GRABBED |
2419 V4L2_CTRL_FLAG_VOLATILE)) {
2420 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2421 pr_cont(" inactive");
2422 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2423 pr_cont(" grabbed");
2424 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2425 pr_cont(" volatile");
2430 /* Log all controls owned by the handler */
2431 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2434 struct v4l2_ctrl *ctrl;
2435 const char *colon = "";
2442 len = strlen(prefix);
2443 if (len && prefix[len - 1] != ' ')
2445 mutex_lock(hdl->lock);
2446 list_for_each_entry(ctrl, &hdl->ctrls, node)
2447 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2448 log_ctrl(ctrl, prefix, colon);
2449 mutex_unlock(hdl->lock);
2451 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2453 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2455 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2458 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2460 /* Call s_ctrl for all controls owned by the handler */
2461 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2463 struct v4l2_ctrl *ctrl;
2469 lockdep_assert_held(hdl->lock);
2471 list_for_each_entry(ctrl, &hdl->ctrls, node)
2474 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2475 struct v4l2_ctrl *master = ctrl->cluster[0];
2478 /* Skip if this control was already handled by a cluster. */
2479 /* Skip button controls and read-only controls. */
2480 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2481 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2484 for (i = 0; i < master->ncontrols; i++) {
2485 if (master->cluster[i]) {
2486 cur_to_new(master->cluster[i]);
2487 master->cluster[i]->is_new = 1;
2488 master->cluster[i]->done = true;
2491 ret = call_op(master, s_ctrl);
2498 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
2500 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2507 mutex_lock(hdl->lock);
2508 ret = __v4l2_ctrl_handler_setup(hdl);
2509 mutex_unlock(hdl->lock);
2513 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2515 /* Implement VIDIOC_QUERY_EXT_CTRL */
2516 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2518 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2519 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2520 struct v4l2_ctrl_ref *ref;
2521 struct v4l2_ctrl *ctrl;
2526 mutex_lock(hdl->lock);
2528 /* Try to find it */
2529 ref = find_ref(hdl, id);
2531 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2533 /* Match any control that is not hidden */
2537 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2538 /* Match any hidden control */
2540 } else if ((qc->id & next_flags) == next_flags) {
2541 /* Match any control, compound or not */
2545 /* Find the next control with ID > qc->id */
2547 /* Did we reach the end of the control list? */
2548 if (id >= node2id(hdl->ctrl_refs.prev)) {
2549 ref = NULL; /* Yes, so there is no next control */
2551 /* We found a control with the given ID, so just get
2552 the next valid one in the list. */
2553 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2554 is_compound = ref->ctrl->is_array ||
2555 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2556 if (id < ref->ctrl->id &&
2557 (is_compound & mask) == match)
2560 if (&ref->node == &hdl->ctrl_refs)
2563 /* No control with the given ID exists, so start
2564 searching for the next largest ID. We know there
2565 is one, otherwise the first 'if' above would have
2567 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2568 is_compound = ref->ctrl->is_array ||
2569 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2570 if (id < ref->ctrl->id &&
2571 (is_compound & mask) == match)
2574 if (&ref->node == &hdl->ctrl_refs)
2578 mutex_unlock(hdl->lock);
2584 memset(qc, 0, sizeof(*qc));
2585 if (id >= V4L2_CID_PRIVATE_BASE)
2589 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2590 qc->flags = user_flags(ctrl);
2591 qc->type = ctrl->type;
2592 qc->elem_size = ctrl->elem_size;
2593 qc->elems = ctrl->elems;
2594 qc->nr_of_dims = ctrl->nr_of_dims;
2595 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2596 qc->minimum = ctrl->minimum;
2597 qc->maximum = ctrl->maximum;
2598 qc->default_value = ctrl->default_value;
2599 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2600 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2603 qc->step = ctrl->step;
2606 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2608 /* Implement VIDIOC_QUERYCTRL */
2609 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2611 struct v4l2_query_ext_ctrl qec = { qc->id };
2614 rc = v4l2_query_ext_ctrl(hdl, &qec);
2619 qc->type = qec.type;
2620 qc->flags = qec.flags;
2621 strlcpy(qc->name, qec.name, sizeof(qc->name));
2623 case V4L2_CTRL_TYPE_INTEGER:
2624 case V4L2_CTRL_TYPE_BOOLEAN:
2625 case V4L2_CTRL_TYPE_MENU:
2626 case V4L2_CTRL_TYPE_INTEGER_MENU:
2627 case V4L2_CTRL_TYPE_STRING:
2628 case V4L2_CTRL_TYPE_BITMASK:
2629 qc->minimum = qec.minimum;
2630 qc->maximum = qec.maximum;
2631 qc->step = qec.step;
2632 qc->default_value = qec.default_value;
2638 qc->default_value = 0;
2643 EXPORT_SYMBOL(v4l2_queryctrl);
2645 /* Implement VIDIOC_QUERYMENU */
2646 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2648 struct v4l2_ctrl *ctrl;
2651 ctrl = v4l2_ctrl_find(hdl, qm->id);
2657 switch (ctrl->type) {
2658 case V4L2_CTRL_TYPE_MENU:
2659 if (ctrl->qmenu == NULL)
2662 case V4L2_CTRL_TYPE_INTEGER_MENU:
2663 if (ctrl->qmenu_int == NULL)
2670 if (i < ctrl->minimum || i > ctrl->maximum)
2673 /* Use mask to see if this menu item should be skipped */
2674 if (ctrl->menu_skip_mask & (1 << i))
2676 /* Empty menu items should also be skipped */
2677 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2678 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2680 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2682 qm->value = ctrl->qmenu_int[i];
2686 EXPORT_SYMBOL(v4l2_querymenu);
2689 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2691 It is not a fully atomic operation, just best-effort only. After all, if
2692 multiple controls have to be set through multiple i2c writes (for example)
2693 then some initial writes may succeed while others fail. Thus leaving the
2694 system in an inconsistent state. The question is how much effort you are
2695 willing to spend on trying to make something atomic that really isn't.
2697 From the point of view of an application the main requirement is that
2698 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2699 error should be returned without actually affecting any controls.
2701 If all the values are correct, then it is acceptable to just give up
2702 in case of low-level errors.
2704 It is important though that the application can tell when only a partial
2705 configuration was done. The way we do that is through the error_idx field
2706 of struct v4l2_ext_controls: if that is equal to the count field then no
2707 controls were affected. Otherwise all controls before that index were
2708 successful in performing their 'get' or 'set' operation, the control at
2709 the given index failed, and you don't know what happened with the controls
2710 after the failed one. Since if they were part of a control cluster they
2711 could have been successfully processed (if a cluster member was encountered
2712 at index < error_idx), they could have failed (if a cluster member was at
2713 error_idx), or they may not have been processed yet (if the first cluster
2714 member appeared after error_idx).
2716 It is all fairly theoretical, though. In practice all you can do is to
2717 bail out. If error_idx == count, then it is an application bug. If
2718 error_idx < count then it is only an application bug if the error code was
2719 EBUSY. That usually means that something started streaming just when you
2720 tried to set the controls. In all other cases it is a driver/hardware
2721 problem and all you can do is to retry or bail out.
2723 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2724 never modifies controls the error_idx is just set to whatever control
2725 has an invalid value.
2728 /* Prepare for the extended g/s/try functions.
2729 Find the controls in the control array and do some basic checks. */
2730 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2731 struct v4l2_ext_controls *cs,
2732 struct v4l2_ctrl_helper *helpers,
2735 struct v4l2_ctrl_helper *h;
2736 bool have_clusters = false;
2739 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2740 struct v4l2_ext_control *c = &cs->controls[i];
2741 struct v4l2_ctrl_ref *ref;
2742 struct v4l2_ctrl *ctrl;
2743 u32 id = c->id & V4L2_CTRL_ID_MASK;
2748 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2749 V4L2_CTRL_ID2WHICH(id) != cs->which)
2752 /* Old-style private controls are not allowed for
2753 extended controls */
2754 if (id >= V4L2_CID_PRIVATE_BASE)
2756 ref = find_ref_lock(hdl, id);
2760 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2763 if (ctrl->cluster[0]->ncontrols > 1)
2764 have_clusters = true;
2765 if (ctrl->cluster[0] != ctrl)
2766 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2767 if (ctrl->is_ptr && !ctrl->is_string) {
2768 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2770 if (c->size < tot_size) {
2779 /* Store the ref to the master control of the cluster */
2782 /* Initially set next to 0, meaning that there is no other
2783 control in this helper array belonging to the same
2788 /* We are done if there were no controls that belong to a multi-
2793 /* The code below figures out in O(n) time which controls in the list
2794 belong to the same cluster. */
2796 /* This has to be done with the handler lock taken. */
2797 mutex_lock(hdl->lock);
2799 /* First zero the helper field in the master control references */
2800 for (i = 0; i < cs->count; i++)
2801 helpers[i].mref->helper = NULL;
2802 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2803 struct v4l2_ctrl_ref *mref = h->mref;
2805 /* If the mref->helper is set, then it points to an earlier
2806 helper that belongs to the same cluster. */
2808 /* Set the next field of mref->helper to the current
2809 index: this means that that earlier helper now
2810 points to the next helper in the same cluster. */
2811 mref->helper->next = i;
2812 /* mref should be set only for the first helper in the
2813 cluster, clear the others. */
2816 /* Point the mref helper to the current helper struct. */
2819 mutex_unlock(hdl->lock);
2823 /* Handles the corner case where cs->count == 0. It checks whether the
2824 specified control class exists. If that class ID is 0, then it checks
2825 whether there are any controls at all. */
2826 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2828 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2829 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2830 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2835 /* Get extended controls. Allocates the helpers array if needed. */
2836 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2838 struct v4l2_ctrl_helper helper[4];
2839 struct v4l2_ctrl_helper *helpers = helper;
2844 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2846 cs->error_idx = cs->count;
2847 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2853 return class_check(hdl, cs->which);
2855 if (cs->count > ARRAY_SIZE(helper)) {
2856 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
2858 if (helpers == NULL)
2862 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2863 cs->error_idx = cs->count;
2865 for (i = 0; !ret && i < cs->count; i++)
2866 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2869 for (i = 0; !ret && i < cs->count; i++) {
2870 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2871 struct v4l2_ctrl *ctrl);
2872 struct v4l2_ctrl *master;
2874 ctrl_to_user = def_value ? def_to_user : cur_to_user;
2876 if (helpers[i].mref == NULL)
2879 master = helpers[i].mref->ctrl;
2882 v4l2_ctrl_lock(master);
2884 /* g_volatile_ctrl will update the new control values */
2886 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2887 (master->has_volatiles && !is_cur_manual(master)))) {
2888 for (j = 0; j < master->ncontrols; j++)
2889 cur_to_new(master->cluster[j]);
2890 ret = call_op(master, g_volatile_ctrl);
2891 ctrl_to_user = new_to_user;
2893 /* If OK, then copy the current (for non-volatile controls)
2894 or the new (for volatile controls) control values to the
2900 ret = ctrl_to_user(cs->controls + idx,
2902 idx = helpers[idx].next;
2903 } while (!ret && idx);
2905 v4l2_ctrl_unlock(master);
2908 if (cs->count > ARRAY_SIZE(helper))
2912 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2914 /* Helper function to get a single control */
2915 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2917 struct v4l2_ctrl *master = ctrl->cluster[0];
2921 /* Compound controls are not supported. The new_to_user() and
2922 * cur_to_user() calls below would need to be modified not to access
2923 * userspace memory when called from get_ctrl().
2925 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2928 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2931 v4l2_ctrl_lock(master);
2932 /* g_volatile_ctrl will update the current control values */
2933 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2934 for (i = 0; i < master->ncontrols; i++)
2935 cur_to_new(master->cluster[i]);
2936 ret = call_op(master, g_volatile_ctrl);
2937 new_to_user(c, ctrl);
2939 cur_to_user(c, ctrl);
2941 v4l2_ctrl_unlock(master);
2945 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2947 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2948 struct v4l2_ext_control c;
2951 if (ctrl == NULL || !ctrl->is_int)
2953 ret = get_ctrl(ctrl, &c);
2954 control->value = c.value;
2957 EXPORT_SYMBOL(v4l2_g_ctrl);
2959 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2961 struct v4l2_ext_control c;
2963 /* It's a driver bug if this happens. */
2964 WARN_ON(!ctrl->is_int);
2969 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2971 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2973 struct v4l2_ext_control c;
2975 /* It's a driver bug if this happens. */
2976 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2981 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2984 /* Core function that calls try/s_ctrl and ensures that the new value is
2985 copied to the current value on a set.
2986 Must be called with ctrl->handler->lock held. */
2987 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2988 bool set, u32 ch_flags)
2994 /* Go through the cluster and either validate the new value or
2995 (if no new value was set), copy the current value to the new
2996 value, ensuring a consistent view for the control ops when
2998 for (i = 0; i < master->ncontrols; i++) {
2999 struct v4l2_ctrl *ctrl = master->cluster[i];
3004 if (!ctrl->is_new) {
3008 /* Check again: it may have changed since the
3009 previous check in try_or_set_ext_ctrls(). */
3010 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3014 ret = call_op(master, try_ctrl);
3016 /* Don't set if there is no change */
3017 if (ret || !set || !cluster_changed(master))
3019 ret = call_op(master, s_ctrl);
3023 /* If OK, then make the new values permanent. */
3024 update_flag = is_cur_manual(master) != is_new_manual(master);
3025 for (i = 0; i < master->ncontrols; i++)
3026 new_to_cur(fh, master->cluster[i], ch_flags |
3027 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3031 /* Validate controls. */
3032 static int validate_ctrls(struct v4l2_ext_controls *cs,
3033 struct v4l2_ctrl_helper *helpers, bool set)
3038 cs->error_idx = cs->count;
3039 for (i = 0; i < cs->count; i++) {
3040 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3041 union v4l2_ctrl_ptr p_new;
3045 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3047 /* This test is also done in try_set_control_cluster() which
3048 is called in atomic context, so that has the final say,
3049 but it makes sense to do an up-front check as well. Once
3050 an error occurs in try_set_control_cluster() some other
3051 controls may have been set already and we want to do a
3052 best-effort to avoid that. */
3053 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3056 * Skip validation for now if the payload needs to be copied
3057 * from userspace into kernelspace. We'll validate those later.
3061 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3062 p_new.p_s64 = &cs->controls[i].value64;
3064 p_new.p_s32 = &cs->controls[i].value;
3065 ret = validate_new(ctrl, p_new);
3072 /* Obtain the current volatile values of an autocluster and mark them
3074 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3078 for (i = 1; i < master->ncontrols; i++)
3079 cur_to_new(master->cluster[i]);
3080 if (!call_op(master, g_volatile_ctrl))
3081 for (i = 1; i < master->ncontrols; i++)
3082 if (master->cluster[i])
3083 master->cluster[i]->is_new = 1;
3086 /* Try or try-and-set controls */
3087 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3088 struct v4l2_ext_controls *cs,
3091 struct v4l2_ctrl_helper helper[4];
3092 struct v4l2_ctrl_helper *helpers = helper;
3096 cs->error_idx = cs->count;
3098 /* Default value cannot be changed */
3099 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3102 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3108 return class_check(hdl, cs->which);
3110 if (cs->count > ARRAY_SIZE(helper)) {
3111 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3116 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3118 ret = validate_ctrls(cs, helpers, set);
3120 cs->error_idx = cs->count;
3121 for (i = 0; !ret && i < cs->count; i++) {
3122 struct v4l2_ctrl *master;
3125 if (helpers[i].mref == NULL)
3129 master = helpers[i].mref->ctrl;
3130 v4l2_ctrl_lock(master);
3132 /* Reset the 'is_new' flags of the cluster */
3133 for (j = 0; j < master->ncontrols; j++)
3134 if (master->cluster[j])
3135 master->cluster[j]->is_new = 0;
3137 /* For volatile autoclusters that are currently in auto mode
3138 we need to discover if it will be set to manual mode.
3139 If so, then we have to copy the current volatile values
3140 first since those will become the new manual values (which
3141 may be overwritten by explicit new values from this set
3143 if (master->is_auto && master->has_volatiles &&
3144 !is_cur_manual(master)) {
3145 /* Pick an initial non-manual value */
3146 s32 new_auto_val = master->manual_mode_value + 1;
3150 /* Check if the auto control is part of the
3151 list, and remember the new value. */
3152 if (helpers[tmp_idx].ctrl == master)
3153 new_auto_val = cs->controls[tmp_idx].value;
3154 tmp_idx = helpers[tmp_idx].next;
3156 /* If the new value == the manual value, then copy
3157 the current volatile values. */
3158 if (new_auto_val == master->manual_mode_value)
3159 update_from_auto_cluster(master);
3162 /* Copy the new caller-supplied control values.
3163 user_to_new() sets 'is_new' to 1. */
3165 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3167 ret = user_to_new(cs->controls + idx, ctrl);
3168 if (!ret && ctrl->is_ptr)
3169 ret = validate_new(ctrl, ctrl->p_new);
3170 idx = helpers[idx].next;
3171 } while (!ret && idx);
3174 ret = try_or_set_cluster(fh, master, set, 0);
3176 /* Copy the new values back to userspace. */
3180 ret = new_to_user(cs->controls + idx,
3182 idx = helpers[idx].next;
3183 } while (!ret && idx);
3185 v4l2_ctrl_unlock(master);
3188 if (cs->count > ARRAY_SIZE(helper))
3193 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3195 return try_set_ext_ctrls(NULL, hdl, cs, false);
3197 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3199 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3200 struct v4l2_ext_controls *cs)
3202 return try_set_ext_ctrls(fh, hdl, cs, true);
3204 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3206 /* Helper function for VIDIOC_S_CTRL compatibility */
3207 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3209 struct v4l2_ctrl *master = ctrl->cluster[0];
3213 /* Reset the 'is_new' flags of the cluster */
3214 for (i = 0; i < master->ncontrols; i++)
3215 if (master->cluster[i])
3216 master->cluster[i]->is_new = 0;
3218 ret = validate_new(ctrl, ctrl->p_new);
3222 /* For autoclusters with volatiles that are switched from auto to
3223 manual mode we have to update the current volatile values since
3224 those will become the initial manual values after such a switch. */
3225 if (master->is_auto && master->has_volatiles && ctrl == master &&
3226 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3227 update_from_auto_cluster(master);
3230 return try_or_set_cluster(fh, master, true, ch_flags);
3233 /* Helper function for VIDIOC_S_CTRL compatibility */
3234 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3235 struct v4l2_ext_control *c)
3239 v4l2_ctrl_lock(ctrl);
3240 user_to_new(c, ctrl);
3241 ret = set_ctrl(fh, ctrl, 0);
3243 cur_to_user(c, ctrl);
3244 v4l2_ctrl_unlock(ctrl);
3248 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3249 struct v4l2_control *control)
3251 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3252 struct v4l2_ext_control c = { control->id };
3255 if (ctrl == NULL || !ctrl->is_int)
3258 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3261 c.value = control->value;
3262 ret = set_ctrl_lock(fh, ctrl, &c);
3263 control->value = c.value;
3266 EXPORT_SYMBOL(v4l2_s_ctrl);
3268 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3270 lockdep_assert_held(ctrl->handler->lock);
3272 /* It's a driver bug if this happens. */
3273 WARN_ON(!ctrl->is_int);
3275 return set_ctrl(NULL, ctrl, 0);
3277 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3279 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3281 lockdep_assert_held(ctrl->handler->lock);
3283 /* It's a driver bug if this happens. */
3284 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3285 *ctrl->p_new.p_s64 = val;
3286 return set_ctrl(NULL, ctrl, 0);
3288 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3290 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3292 lockdep_assert_held(ctrl->handler->lock);
3294 /* It's a driver bug if this happens. */
3295 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3296 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3297 return set_ctrl(NULL, ctrl, 0);
3299 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3301 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3305 if (notify == NULL) {
3306 ctrl->call_notify = 0;
3309 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3311 ctrl->handler->notify = notify;
3312 ctrl->handler->notify_priv = priv;
3313 ctrl->call_notify = 1;
3315 EXPORT_SYMBOL(v4l2_ctrl_notify);
3317 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3318 s64 min, s64 max, u64 step, s64 def)
3321 bool range_changed = false;
3324 lockdep_assert_held(ctrl->handler->lock);
3326 switch (ctrl->type) {
3327 case V4L2_CTRL_TYPE_INTEGER:
3328 case V4L2_CTRL_TYPE_INTEGER64:
3329 case V4L2_CTRL_TYPE_BOOLEAN:
3330 case V4L2_CTRL_TYPE_MENU:
3331 case V4L2_CTRL_TYPE_INTEGER_MENU:
3332 case V4L2_CTRL_TYPE_BITMASK:
3333 case V4L2_CTRL_TYPE_U8:
3334 case V4L2_CTRL_TYPE_U16:
3335 case V4L2_CTRL_TYPE_U32:
3338 ret = check_range(ctrl->type, min, max, step, def);
3345 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3346 (ctrl->step != step) || ctrl->default_value != def) {
3347 range_changed = true;
3348 ctrl->minimum = min;
3349 ctrl->maximum = max;
3351 ctrl->default_value = def;
3354 if (validate_new(ctrl, ctrl->p_new)) {
3355 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3356 *ctrl->p_new.p_s64 = def;
3358 *ctrl->p_new.p_s32 = def;
3361 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3362 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3364 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3366 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3367 else if (range_changed)
3368 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3371 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3373 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3375 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3380 v4l2_ctrl_lock(ctrl);
3381 list_add_tail(&sev->node, &ctrl->ev_subs);
3382 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3383 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3384 struct v4l2_event ev;
3385 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3387 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3388 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3389 fill_event(&ev, ctrl, changes);
3390 /* Mark the queue as active, allowing this initial
3391 event to be accepted. */
3393 v4l2_event_queue_fh(sev->fh, &ev);
3395 v4l2_ctrl_unlock(ctrl);
3399 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3401 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3406 v4l2_ctrl_lock(ctrl);
3407 list_del(&sev->node);
3408 v4l2_ctrl_unlock(ctrl);
3411 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3413 u32 old_changes = old->u.ctrl.changes;
3415 old->u.ctrl = new->u.ctrl;
3416 old->u.ctrl.changes |= old_changes;
3418 EXPORT_SYMBOL(v4l2_ctrl_replace);
3420 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3422 new->u.ctrl.changes |= old->u.ctrl.changes;
3424 EXPORT_SYMBOL(v4l2_ctrl_merge);
3426 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3427 .add = v4l2_ctrl_add_event,
3428 .del = v4l2_ctrl_del_event,
3429 .replace = v4l2_ctrl_replace,
3430 .merge = v4l2_ctrl_merge,
3432 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3434 int v4l2_ctrl_log_status(struct file *file, void *fh)
3436 struct video_device *vfd = video_devdata(file);
3437 struct v4l2_fh *vfh = file->private_data;
3439 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3440 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3441 vfd->v4l2_dev->name);
3444 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3446 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3447 const struct v4l2_event_subscription *sub)
3449 if (sub->type == V4L2_EVENT_CTRL)
3450 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3453 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3455 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3456 struct v4l2_event_subscription *sub)
3458 if (!sd->ctrl_handler)
3460 return v4l2_ctrl_subscribe_event(fh, sub);
3462 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3464 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3466 struct v4l2_fh *fh = file->private_data;
3468 if (v4l2_event_pending(fh))
3470 poll_wait(file, &fh->wait, wait);
3473 EXPORT_SYMBOL(v4l2_ctrl_poll);