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 ref corresponding to the v4l2_ext_control ID field. */
41 struct v4l2_ctrl_ref *ref;
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",
434 static const char * const vp8_profile[] = {
441 static const char * const vp9_profile[] = {
449 static const char * const flash_led_mode[] = {
455 static const char * const flash_strobe_source[] = {
461 static const char * const jpeg_chroma_subsampling[] = {
470 static const char * const dv_tx_mode[] = {
475 static const char * const dv_rgb_range[] = {
477 "RGB Limited Range (16-235)",
478 "RGB Full Range (0-255)",
481 static const char * const dv_it_content_type[] = {
489 static const char * const detect_md_mode[] = {
497 static const char * const hevc_profile[] = {
499 "Main Still Picture",
503 static const char * const hevc_level[] = {
519 static const char * const hevc_hierarchial_coding_type[] = {
524 static const char * const hevc_refresh_type[] = {
530 static const char * const hevc_size_of_length_field[] = {
537 static const char * const hevc_tier[] = {
542 static const char * const hevc_loop_filter_mode[] = {
545 "Disabled at slice boundary",
550 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
551 return mpeg_audio_sampling_freq;
552 case V4L2_CID_MPEG_AUDIO_ENCODING:
553 return mpeg_audio_encoding;
554 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
555 return mpeg_audio_l1_bitrate;
556 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
557 return mpeg_audio_l2_bitrate;
558 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
559 return mpeg_audio_l3_bitrate;
560 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
561 return mpeg_audio_ac3_bitrate;
562 case V4L2_CID_MPEG_AUDIO_MODE:
563 return mpeg_audio_mode;
564 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
565 return mpeg_audio_mode_extension;
566 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
567 return mpeg_audio_emphasis;
568 case V4L2_CID_MPEG_AUDIO_CRC:
569 return mpeg_audio_crc;
570 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
571 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
572 return mpeg_audio_dec_playback;
573 case V4L2_CID_MPEG_VIDEO_ENCODING:
574 return mpeg_video_encoding;
575 case V4L2_CID_MPEG_VIDEO_ASPECT:
576 return mpeg_video_aspect;
577 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
578 return mpeg_video_bitrate_mode;
579 case V4L2_CID_MPEG_STREAM_TYPE:
580 return mpeg_stream_type;
581 case V4L2_CID_MPEG_STREAM_VBI_FMT:
582 return mpeg_stream_vbi_fmt;
583 case V4L2_CID_POWER_LINE_FREQUENCY:
584 return camera_power_line_frequency;
585 case V4L2_CID_EXPOSURE_AUTO:
586 return camera_exposure_auto;
587 case V4L2_CID_EXPOSURE_METERING:
588 return camera_exposure_metering;
589 case V4L2_CID_AUTO_FOCUS_RANGE:
590 return camera_auto_focus_range;
591 case V4L2_CID_COLORFX:
593 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
594 return auto_n_preset_white_balance;
595 case V4L2_CID_ISO_SENSITIVITY_AUTO:
596 return camera_iso_sensitivity_auto;
597 case V4L2_CID_SCENE_MODE:
599 case V4L2_CID_TUNE_PREEMPHASIS:
600 return tune_emphasis;
601 case V4L2_CID_TUNE_DEEMPHASIS:
602 return tune_emphasis;
603 case V4L2_CID_FLASH_LED_MODE:
604 return flash_led_mode;
605 case V4L2_CID_FLASH_STROBE_SOURCE:
606 return flash_strobe_source;
607 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
609 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
611 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
613 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
614 return mpeg_h264_level;
615 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
616 return h264_loop_filter;
617 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
619 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
621 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
622 return h264_fp_arrangement_type;
623 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
624 return h264_fmo_map_type;
625 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
626 return mpeg_mpeg4_level;
627 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
628 return mpeg4_profile;
629 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
630 return vpx_golden_frame_sel;
631 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
633 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
635 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
636 return jpeg_chroma_subsampling;
637 case V4L2_CID_DV_TX_MODE:
639 case V4L2_CID_DV_TX_RGB_RANGE:
640 case V4L2_CID_DV_RX_RGB_RANGE:
642 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
643 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
644 return dv_it_content_type;
645 case V4L2_CID_DETECT_MD_MODE:
646 return detect_md_mode;
647 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
649 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
651 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
652 return hevc_hierarchial_coding_type;
653 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
654 return hevc_refresh_type;
655 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
656 return hevc_size_of_length_field;
657 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
659 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
660 return hevc_loop_filter_mode;
666 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
668 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
670 * Returns NULL or an s64 type array containing the menu for given
671 * control ID. The total number of the menu items is returned in @len.
673 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
675 static const s64 qmenu_int_vpx_num_partitions[] = {
679 static const s64 qmenu_int_vpx_num_ref_frames[] = {
684 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
685 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
686 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
687 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
693 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
695 /* Return the control name. */
696 const char *v4l2_ctrl_get_name(u32 id)
700 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
701 case V4L2_CID_USER_CLASS: return "User Controls";
702 case V4L2_CID_BRIGHTNESS: return "Brightness";
703 case V4L2_CID_CONTRAST: return "Contrast";
704 case V4L2_CID_SATURATION: return "Saturation";
705 case V4L2_CID_HUE: return "Hue";
706 case V4L2_CID_AUDIO_VOLUME: return "Volume";
707 case V4L2_CID_AUDIO_BALANCE: return "Balance";
708 case V4L2_CID_AUDIO_BASS: return "Bass";
709 case V4L2_CID_AUDIO_TREBLE: return "Treble";
710 case V4L2_CID_AUDIO_MUTE: return "Mute";
711 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
712 case V4L2_CID_BLACK_LEVEL: return "Black Level";
713 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
714 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
715 case V4L2_CID_RED_BALANCE: return "Red Balance";
716 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
717 case V4L2_CID_GAMMA: return "Gamma";
718 case V4L2_CID_EXPOSURE: return "Exposure";
719 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
720 case V4L2_CID_GAIN: return "Gain";
721 case V4L2_CID_HFLIP: return "Horizontal Flip";
722 case V4L2_CID_VFLIP: return "Vertical Flip";
723 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
724 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
725 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
726 case V4L2_CID_SHARPNESS: return "Sharpness";
727 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
728 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
729 case V4L2_CID_COLOR_KILLER: return "Color Killer";
730 case V4L2_CID_COLORFX: return "Color Effects";
731 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
732 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
733 case V4L2_CID_ROTATE: return "Rotate";
734 case V4L2_CID_BG_COLOR: return "Background Color";
735 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
736 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
737 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
738 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
739 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
740 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
741 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
744 /* The MPEG controls are applicable to all codec controls
745 * and the 'MPEG' part of the define is historical */
746 /* Keep the order of the 'case's the same as in videodev2.h! */
747 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
748 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
749 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
750 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
751 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
752 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
753 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
754 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
755 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
756 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
757 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
758 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
759 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
760 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
761 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
762 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
763 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
764 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
765 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
766 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
767 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
768 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
769 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
770 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
771 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
772 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
773 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
774 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
775 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
776 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
777 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
778 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
779 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
780 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
781 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
782 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
783 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
784 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
785 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
786 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
787 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
788 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
789 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
790 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
791 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
792 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
793 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
794 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
795 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
796 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
797 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
798 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
799 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
800 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
801 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
802 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
803 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
804 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
805 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
806 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
807 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
808 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
809 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
810 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
811 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
812 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
813 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
814 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
815 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
816 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
817 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
818 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
819 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
820 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
821 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
822 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
823 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
824 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
825 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
826 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
827 return "H264 Set QP Value for HC Layers";
828 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
829 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
830 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
831 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
832 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
833 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
834 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
835 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
836 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
837 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
838 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
839 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
840 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
841 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
842 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
843 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
844 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
845 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
846 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
847 case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS: return "MPEG-2 Slice Parameters";
848 case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION: return "MPEG-2 Quantization Matrices";
851 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
852 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
853 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
854 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
855 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
856 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
857 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
858 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
859 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
860 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
861 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
862 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE: return "VP8 Profile";
863 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE: return "VP9 Profile";
866 case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP: return "HEVC I-Frame QP Value";
867 case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP: return "HEVC P-Frame QP Value";
868 case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP: return "HEVC B-Frame QP Value";
869 case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP: return "HEVC Minimum QP Value";
870 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP: return "HEVC Maximum QP Value";
871 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE: return "HEVC Profile";
872 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL: return "HEVC Level";
873 case V4L2_CID_MPEG_VIDEO_HEVC_TIER: return "HEVC Tier";
874 case V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION: return "HEVC Frame Rate Resolution";
875 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH: return "HEVC Maximum Coding Unit Depth";
876 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE: return "HEVC Refresh Type";
877 case V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED: return "HEVC Constant Intra Prediction";
878 case V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU: return "HEVC Lossless Encoding";
879 case V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT: return "HEVC Wavefront";
880 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE: return "HEVC Loop Filter";
881 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP: return "HEVC QP Values";
882 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE: return "HEVC Hierarchical Coding Type";
883 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER: return "HEVC Hierarchical Coding Layer";
884 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP: return "HEVC Hierarchical Layer 0 QP";
885 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP: return "HEVC Hierarchical Layer 1 QP";
886 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP: return "HEVC Hierarchical Layer 2 QP";
887 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP: return "HEVC Hierarchical Layer 3 QP";
888 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP: return "HEVC Hierarchical Layer 4 QP";
889 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP: return "HEVC Hierarchical Layer 5 QP";
890 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP: return "HEVC Hierarchical Layer 6 QP";
891 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR: return "HEVC Hierarchical Lay 0 BitRate";
892 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR: return "HEVC Hierarchical Lay 1 BitRate";
893 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR: return "HEVC Hierarchical Lay 2 BitRate";
894 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR: return "HEVC Hierarchical Lay 3 BitRate";
895 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR: return "HEVC Hierarchical Lay 4 BitRate";
896 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR: return "HEVC Hierarchical Lay 5 BitRate";
897 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR: return "HEVC Hierarchical Lay 6 BitRate";
898 case V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB: return "HEVC General PB";
899 case V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID: return "HEVC Temporal ID";
900 case V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING: return "HEVC Strong Intra Smoothing";
901 case V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT: return "HEVC Intra PU Split";
902 case V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION: return "HEVC TMV Prediction";
903 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1: return "HEVC Max Num of Candidate MVs";
904 case V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE: return "HEVC ENC Without Startcode";
905 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD: return "HEVC Num of I-Frame b/w 2 IDR";
906 case V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2: return "HEVC Loop Filter Beta Offset";
907 case V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2: return "HEVC Loop Filter TC Offset";
908 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD: return "HEVC Size of Length Field";
909 case V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES: return "Reference Frames for a P-Frame";
910 case V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR: return "Prepend SPS and PPS to IDR";
912 /* CAMERA controls */
913 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
914 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
915 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
916 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
917 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
918 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
919 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
920 case V4L2_CID_PAN_RESET: return "Pan, Reset";
921 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
922 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
923 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
924 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
925 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
926 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
927 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
928 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
929 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
930 case V4L2_CID_PRIVACY: return "Privacy";
931 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
932 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
933 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
934 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
935 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
936 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
937 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
938 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
939 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
940 case V4L2_CID_SCENE_MODE: return "Scene Mode";
941 case V4L2_CID_3A_LOCK: return "3A Lock";
942 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
943 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
944 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
945 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
946 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
947 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
949 /* FM Radio Modulator controls */
950 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
951 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
952 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
953 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
954 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
955 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
956 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
957 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
958 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
959 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
960 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
961 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
962 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
963 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
964 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
965 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
966 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
967 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
968 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
969 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
970 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
971 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
972 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
973 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
974 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
975 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
976 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
977 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
978 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
979 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
982 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
983 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
984 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
985 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
986 case V4L2_CID_FLASH_STROBE: return "Strobe";
987 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
988 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
989 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
990 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
991 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
992 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
993 case V4L2_CID_FLASH_FAULT: return "Faults";
994 case V4L2_CID_FLASH_CHARGE: return "Charge";
995 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
997 /* JPEG encoder controls */
998 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
999 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
1000 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
1001 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
1002 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
1003 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
1005 /* Image source controls */
1006 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1007 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
1008 case V4L2_CID_VBLANK: return "Vertical Blanking";
1009 case V4L2_CID_HBLANK: return "Horizontal Blanking";
1010 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
1011 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
1012 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
1013 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
1014 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
1016 /* Image processing controls */
1017 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1018 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
1019 case V4L2_CID_LINK_FREQ: return "Link Frequency";
1020 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
1021 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
1022 case V4L2_CID_DEINTERLACING_MODE: return "Deinterlacing Mode";
1023 case V4L2_CID_DIGITAL_GAIN: return "Digital Gain";
1026 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1027 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
1028 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
1029 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
1030 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
1031 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
1032 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
1033 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
1034 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
1035 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
1036 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
1038 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
1039 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
1040 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
1041 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
1042 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
1043 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
1044 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
1045 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
1046 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
1047 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
1048 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
1049 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
1050 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
1051 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
1052 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
1053 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
1054 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
1055 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1056 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
1057 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
1059 /* Detection controls */
1060 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1061 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
1062 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
1063 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
1064 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
1065 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
1070 EXPORT_SYMBOL(v4l2_ctrl_get_name);
1072 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
1073 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
1075 *name = v4l2_ctrl_get_name(id);
1079 case V4L2_CID_AUDIO_MUTE:
1080 case V4L2_CID_AUDIO_LOUDNESS:
1081 case V4L2_CID_AUTO_WHITE_BALANCE:
1082 case V4L2_CID_AUTOGAIN:
1083 case V4L2_CID_HFLIP:
1084 case V4L2_CID_VFLIP:
1085 case V4L2_CID_HUE_AUTO:
1086 case V4L2_CID_CHROMA_AGC:
1087 case V4L2_CID_COLOR_KILLER:
1088 case V4L2_CID_AUTOBRIGHTNESS:
1089 case V4L2_CID_MPEG_AUDIO_MUTE:
1090 case V4L2_CID_MPEG_VIDEO_MUTE:
1091 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
1092 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
1093 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
1094 case V4L2_CID_FOCUS_AUTO:
1095 case V4L2_CID_PRIVACY:
1096 case V4L2_CID_AUDIO_LIMITER_ENABLED:
1097 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
1098 case V4L2_CID_PILOT_TONE_ENABLED:
1099 case V4L2_CID_ILLUMINATORS_1:
1100 case V4L2_CID_ILLUMINATORS_2:
1101 case V4L2_CID_FLASH_STROBE_STATUS:
1102 case V4L2_CID_FLASH_CHARGE:
1103 case V4L2_CID_FLASH_READY:
1104 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
1105 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
1106 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
1107 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
1108 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
1109 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
1110 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
1111 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
1112 case V4L2_CID_WIDE_DYNAMIC_RANGE:
1113 case V4L2_CID_IMAGE_STABILIZATION:
1114 case V4L2_CID_RDS_RECEPTION:
1115 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
1116 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
1117 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
1118 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
1119 case V4L2_CID_RF_TUNER_PLL_LOCK:
1120 case V4L2_CID_RDS_TX_MONO_STEREO:
1121 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
1122 case V4L2_CID_RDS_TX_COMPRESSED:
1123 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
1124 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
1125 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
1126 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
1127 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
1128 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1129 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1130 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1131 *type = V4L2_CTRL_TYPE_BOOLEAN;
1135 case V4L2_CID_ROTATE:
1136 *type = V4L2_CTRL_TYPE_INTEGER;
1137 *flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
1139 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1140 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1141 *type = V4L2_CTRL_TYPE_INTEGER;
1143 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1144 case V4L2_CID_PAN_RESET:
1145 case V4L2_CID_TILT_RESET:
1146 case V4L2_CID_FLASH_STROBE:
1147 case V4L2_CID_FLASH_STROBE_STOP:
1148 case V4L2_CID_AUTO_FOCUS_START:
1149 case V4L2_CID_AUTO_FOCUS_STOP:
1150 *type = V4L2_CTRL_TYPE_BUTTON;
1151 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1152 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1153 *min = *max = *step = *def = 0;
1155 case V4L2_CID_POWER_LINE_FREQUENCY:
1156 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1157 case V4L2_CID_MPEG_AUDIO_ENCODING:
1158 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1159 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1160 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1161 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1162 case V4L2_CID_MPEG_AUDIO_MODE:
1163 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1164 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1165 case V4L2_CID_MPEG_AUDIO_CRC:
1166 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1167 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1168 case V4L2_CID_MPEG_VIDEO_ENCODING:
1169 case V4L2_CID_MPEG_VIDEO_ASPECT:
1170 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1171 case V4L2_CID_MPEG_STREAM_TYPE:
1172 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1173 case V4L2_CID_EXPOSURE_AUTO:
1174 case V4L2_CID_AUTO_FOCUS_RANGE:
1175 case V4L2_CID_COLORFX:
1176 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1177 case V4L2_CID_TUNE_PREEMPHASIS:
1178 case V4L2_CID_FLASH_LED_MODE:
1179 case V4L2_CID_FLASH_STROBE_SOURCE:
1180 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1181 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1182 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1183 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1184 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1185 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1186 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1187 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1188 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1189 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1190 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1191 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1192 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1193 case V4L2_CID_EXPOSURE_METERING:
1194 case V4L2_CID_SCENE_MODE:
1195 case V4L2_CID_DV_TX_MODE:
1196 case V4L2_CID_DV_TX_RGB_RANGE:
1197 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1198 case V4L2_CID_DV_RX_RGB_RANGE:
1199 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1200 case V4L2_CID_TEST_PATTERN:
1201 case V4L2_CID_DEINTERLACING_MODE:
1202 case V4L2_CID_TUNE_DEEMPHASIS:
1203 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1204 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
1205 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
1206 case V4L2_CID_DETECT_MD_MODE:
1207 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
1208 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
1209 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
1210 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
1211 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
1212 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
1213 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
1214 *type = V4L2_CTRL_TYPE_MENU;
1216 case V4L2_CID_LINK_FREQ:
1217 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1219 case V4L2_CID_RDS_TX_PS_NAME:
1220 case V4L2_CID_RDS_TX_RADIO_TEXT:
1221 case V4L2_CID_RDS_RX_PS_NAME:
1222 case V4L2_CID_RDS_RX_RADIO_TEXT:
1223 *type = V4L2_CTRL_TYPE_STRING;
1225 case V4L2_CID_ISO_SENSITIVITY:
1226 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1227 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1228 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1229 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1231 case V4L2_CID_USER_CLASS:
1232 case V4L2_CID_CAMERA_CLASS:
1233 case V4L2_CID_MPEG_CLASS:
1234 case V4L2_CID_FM_TX_CLASS:
1235 case V4L2_CID_FLASH_CLASS:
1236 case V4L2_CID_JPEG_CLASS:
1237 case V4L2_CID_IMAGE_SOURCE_CLASS:
1238 case V4L2_CID_IMAGE_PROC_CLASS:
1239 case V4L2_CID_DV_CLASS:
1240 case V4L2_CID_FM_RX_CLASS:
1241 case V4L2_CID_RF_TUNER_CLASS:
1242 case V4L2_CID_DETECT_CLASS:
1243 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1244 /* You can neither read not write these */
1245 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1246 *min = *max = *step = *def = 0;
1248 case V4L2_CID_BG_COLOR:
1249 *type = V4L2_CTRL_TYPE_INTEGER;
1252 /* Max is calculated as RGB888 that is 2^24 */
1255 case V4L2_CID_FLASH_FAULT:
1256 case V4L2_CID_JPEG_ACTIVE_MARKER:
1257 case V4L2_CID_3A_LOCK:
1258 case V4L2_CID_AUTO_FOCUS_STATUS:
1259 case V4L2_CID_DV_TX_HOTPLUG:
1260 case V4L2_CID_DV_TX_RXSENSE:
1261 case V4L2_CID_DV_TX_EDID_PRESENT:
1262 case V4L2_CID_DV_RX_POWER_PRESENT:
1263 *type = V4L2_CTRL_TYPE_BITMASK;
1265 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1266 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1267 *type = V4L2_CTRL_TYPE_INTEGER;
1268 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1270 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1271 *type = V4L2_CTRL_TYPE_INTEGER64;
1272 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1274 *max = 0x1ffffffffLL;
1277 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1278 *type = V4L2_CTRL_TYPE_INTEGER64;
1279 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1281 *max = 0x7fffffffffffffffLL;
1284 case V4L2_CID_PIXEL_RATE:
1285 *type = V4L2_CTRL_TYPE_INTEGER64;
1286 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1288 case V4L2_CID_DETECT_MD_REGION_GRID:
1289 *type = V4L2_CTRL_TYPE_U8;
1291 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1292 *type = V4L2_CTRL_TYPE_U16;
1294 case V4L2_CID_RDS_TX_ALT_FREQS:
1295 *type = V4L2_CTRL_TYPE_U32;
1297 case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:
1298 *type = V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS;
1300 case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:
1301 *type = V4L2_CTRL_TYPE_MPEG2_QUANTIZATION;
1304 *type = V4L2_CTRL_TYPE_INTEGER;
1308 case V4L2_CID_MPEG_AUDIO_ENCODING:
1309 case V4L2_CID_MPEG_AUDIO_MODE:
1310 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1311 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1312 case V4L2_CID_MPEG_STREAM_TYPE:
1313 *flags |= V4L2_CTRL_FLAG_UPDATE;
1315 case V4L2_CID_AUDIO_VOLUME:
1316 case V4L2_CID_AUDIO_BALANCE:
1317 case V4L2_CID_AUDIO_BASS:
1318 case V4L2_CID_AUDIO_TREBLE:
1319 case V4L2_CID_BRIGHTNESS:
1320 case V4L2_CID_CONTRAST:
1321 case V4L2_CID_SATURATION:
1323 case V4L2_CID_RED_BALANCE:
1324 case V4L2_CID_BLUE_BALANCE:
1325 case V4L2_CID_GAMMA:
1326 case V4L2_CID_SHARPNESS:
1327 case V4L2_CID_CHROMA_GAIN:
1328 case V4L2_CID_RDS_TX_DEVIATION:
1329 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1330 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1331 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1332 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1333 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1334 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1335 case V4L2_CID_PILOT_TONE_DEVIATION:
1336 case V4L2_CID_PILOT_TONE_FREQUENCY:
1337 case V4L2_CID_TUNE_POWER_LEVEL:
1338 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1339 case V4L2_CID_RF_TUNER_RF_GAIN:
1340 case V4L2_CID_RF_TUNER_LNA_GAIN:
1341 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1342 case V4L2_CID_RF_TUNER_IF_GAIN:
1343 case V4L2_CID_RF_TUNER_BANDWIDTH:
1344 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1345 *flags |= V4L2_CTRL_FLAG_SLIDER;
1347 case V4L2_CID_PAN_RELATIVE:
1348 case V4L2_CID_TILT_RELATIVE:
1349 case V4L2_CID_FOCUS_RELATIVE:
1350 case V4L2_CID_IRIS_RELATIVE:
1351 case V4L2_CID_ZOOM_RELATIVE:
1352 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1353 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1355 case V4L2_CID_FLASH_STROBE_STATUS:
1356 case V4L2_CID_AUTO_FOCUS_STATUS:
1357 case V4L2_CID_FLASH_READY:
1358 case V4L2_CID_DV_TX_HOTPLUG:
1359 case V4L2_CID_DV_TX_RXSENSE:
1360 case V4L2_CID_DV_TX_EDID_PRESENT:
1361 case V4L2_CID_DV_RX_POWER_PRESENT:
1362 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1363 case V4L2_CID_RDS_RX_PTY:
1364 case V4L2_CID_RDS_RX_PS_NAME:
1365 case V4L2_CID_RDS_RX_RADIO_TEXT:
1366 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1367 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1368 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1369 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1371 case V4L2_CID_RF_TUNER_PLL_LOCK:
1372 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1376 EXPORT_SYMBOL(v4l2_ctrl_fill);
1378 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1380 u32 flags = ctrl->flags;
1383 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1388 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1390 memset(ev->reserved, 0, sizeof(ev->reserved));
1391 ev->type = V4L2_EVENT_CTRL;
1393 ev->u.ctrl.changes = changes;
1394 ev->u.ctrl.type = ctrl->type;
1395 ev->u.ctrl.flags = user_flags(ctrl);
1397 ev->u.ctrl.value64 = 0;
1399 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1400 ev->u.ctrl.minimum = ctrl->minimum;
1401 ev->u.ctrl.maximum = ctrl->maximum;
1402 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1403 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1404 ev->u.ctrl.step = 1;
1406 ev->u.ctrl.step = ctrl->step;
1407 ev->u.ctrl.default_value = ctrl->default_value;
1410 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1412 struct v4l2_event ev;
1413 struct v4l2_subscribed_event *sev;
1415 if (list_empty(&ctrl->ev_subs))
1417 fill_event(&ev, ctrl, changes);
1419 list_for_each_entry(sev, &ctrl->ev_subs, node)
1420 if (sev->fh != fh ||
1421 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1422 v4l2_event_queue_fh(sev->fh, &ev);
1425 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1426 union v4l2_ctrl_ptr ptr1,
1427 union v4l2_ctrl_ptr ptr2)
1429 switch (ctrl->type) {
1430 case V4L2_CTRL_TYPE_BUTTON:
1432 case V4L2_CTRL_TYPE_STRING:
1433 idx *= ctrl->elem_size;
1434 /* strings are always 0-terminated */
1435 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1436 case V4L2_CTRL_TYPE_INTEGER64:
1437 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1438 case V4L2_CTRL_TYPE_U8:
1439 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1440 case V4L2_CTRL_TYPE_U16:
1441 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1442 case V4L2_CTRL_TYPE_U32:
1443 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1446 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1447 idx *= ctrl->elem_size;
1448 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1452 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1453 union v4l2_ctrl_ptr ptr)
1455 switch (ctrl->type) {
1456 case V4L2_CTRL_TYPE_STRING:
1457 idx *= ctrl->elem_size;
1458 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1459 ptr.p_char[idx + ctrl->minimum] = '\0';
1461 case V4L2_CTRL_TYPE_INTEGER64:
1462 ptr.p_s64[idx] = ctrl->default_value;
1464 case V4L2_CTRL_TYPE_INTEGER:
1465 case V4L2_CTRL_TYPE_INTEGER_MENU:
1466 case V4L2_CTRL_TYPE_MENU:
1467 case V4L2_CTRL_TYPE_BITMASK:
1468 case V4L2_CTRL_TYPE_BOOLEAN:
1469 ptr.p_s32[idx] = ctrl->default_value;
1471 case V4L2_CTRL_TYPE_U8:
1472 ptr.p_u8[idx] = ctrl->default_value;
1474 case V4L2_CTRL_TYPE_U16:
1475 ptr.p_u16[idx] = ctrl->default_value;
1477 case V4L2_CTRL_TYPE_U32:
1478 ptr.p_u32[idx] = ctrl->default_value;
1481 idx *= ctrl->elem_size;
1482 memset(ptr.p + idx, 0, ctrl->elem_size);
1487 static void std_log(const struct v4l2_ctrl *ctrl)
1489 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1491 if (ctrl->is_array) {
1494 for (i = 0; i < ctrl->nr_of_dims; i++)
1495 pr_cont("[%u]", ctrl->dims[i]);
1499 switch (ctrl->type) {
1500 case V4L2_CTRL_TYPE_INTEGER:
1501 pr_cont("%d", *ptr.p_s32);
1503 case V4L2_CTRL_TYPE_BOOLEAN:
1504 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1506 case V4L2_CTRL_TYPE_MENU:
1507 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1509 case V4L2_CTRL_TYPE_INTEGER_MENU:
1510 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1512 case V4L2_CTRL_TYPE_BITMASK:
1513 pr_cont("0x%08x", *ptr.p_s32);
1515 case V4L2_CTRL_TYPE_INTEGER64:
1516 pr_cont("%lld", *ptr.p_s64);
1518 case V4L2_CTRL_TYPE_STRING:
1519 pr_cont("%s", ptr.p_char);
1521 case V4L2_CTRL_TYPE_U8:
1522 pr_cont("%u", (unsigned)*ptr.p_u8);
1524 case V4L2_CTRL_TYPE_U16:
1525 pr_cont("%u", (unsigned)*ptr.p_u16);
1527 case V4L2_CTRL_TYPE_U32:
1528 pr_cont("%u", (unsigned)*ptr.p_u32);
1531 pr_cont("unknown type %d", ctrl->type);
1537 * Round towards the closest legal value. Be careful when we are
1538 * close to the maximum range of the control type to prevent
1541 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1543 offset_type offset; \
1544 if ((ctrl)->maximum >= 0 && \
1545 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1546 val = (ctrl)->maximum; \
1548 val += (s32)((ctrl)->step / 2); \
1549 val = clamp_t(typeof(val), val, \
1550 (ctrl)->minimum, (ctrl)->maximum); \
1551 offset = (val) - (ctrl)->minimum; \
1552 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1553 val = (ctrl)->minimum + offset; \
1557 /* Validate a new control */
1558 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1559 union v4l2_ctrl_ptr ptr)
1561 struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1566 switch (ctrl->type) {
1567 case V4L2_CTRL_TYPE_INTEGER:
1568 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1569 case V4L2_CTRL_TYPE_INTEGER64:
1571 * We can't use the ROUND_TO_RANGE define here due to
1572 * the u64 divide that needs special care.
1574 val = ptr.p_s64[idx];
1575 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1576 val = ctrl->maximum;
1578 val += (s64)(ctrl->step / 2);
1579 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1580 offset = val - ctrl->minimum;
1581 do_div(offset, ctrl->step);
1582 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1584 case V4L2_CTRL_TYPE_U8:
1585 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1586 case V4L2_CTRL_TYPE_U16:
1587 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1588 case V4L2_CTRL_TYPE_U32:
1589 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1591 case V4L2_CTRL_TYPE_BOOLEAN:
1592 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1595 case V4L2_CTRL_TYPE_MENU:
1596 case V4L2_CTRL_TYPE_INTEGER_MENU:
1597 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1599 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1601 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1602 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1606 case V4L2_CTRL_TYPE_BITMASK:
1607 ptr.p_s32[idx] &= ctrl->maximum;
1610 case V4L2_CTRL_TYPE_BUTTON:
1611 case V4L2_CTRL_TYPE_CTRL_CLASS:
1615 case V4L2_CTRL_TYPE_STRING:
1616 idx *= ctrl->elem_size;
1617 len = strlen(ptr.p_char + idx);
1618 if (len < ctrl->minimum)
1620 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1624 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1625 p_mpeg2_slice_params = ptr.p;
1627 switch (p_mpeg2_slice_params->sequence.chroma_format) {
1636 switch (p_mpeg2_slice_params->picture.intra_dc_precision) {
1637 case 0: /* 8 bits */
1638 case 1: /* 9 bits */
1639 case 11: /* 11 bits */
1645 switch (p_mpeg2_slice_params->picture.picture_structure) {
1646 case 1: /* interlaced top field */
1647 case 2: /* interlaced bottom field */
1648 case 3: /* progressive */
1654 switch (p_mpeg2_slice_params->picture.picture_coding_type) {
1655 case V4L2_MPEG2_PICTURE_CODING_TYPE_I:
1656 case V4L2_MPEG2_PICTURE_CODING_TYPE_P:
1657 case V4L2_MPEG2_PICTURE_CODING_TYPE_B:
1663 if (p_mpeg2_slice_params->backward_ref_index >= VIDEO_MAX_FRAME ||
1664 p_mpeg2_slice_params->forward_ref_index >= VIDEO_MAX_FRAME)
1669 case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
1677 static const struct v4l2_ctrl_type_ops std_type_ops = {
1681 .validate = std_validate,
1684 /* Helper function: copy the given control value back to the caller */
1685 static int ptr_to_user(struct v4l2_ext_control *c,
1686 struct v4l2_ctrl *ctrl,
1687 union v4l2_ctrl_ptr ptr)
1691 if (ctrl->is_ptr && !ctrl->is_string)
1692 return copy_to_user(c->ptr, ptr.p, c->size) ?
1695 switch (ctrl->type) {
1696 case V4L2_CTRL_TYPE_STRING:
1697 len = strlen(ptr.p_char);
1698 if (c->size < len + 1) {
1699 c->size = ctrl->elem_size;
1702 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1704 case V4L2_CTRL_TYPE_INTEGER64:
1705 c->value64 = *ptr.p_s64;
1708 c->value = *ptr.p_s32;
1714 /* Helper function: copy the current control value back to the caller */
1715 static int cur_to_user(struct v4l2_ext_control *c,
1716 struct v4l2_ctrl *ctrl)
1718 return ptr_to_user(c, ctrl, ctrl->p_cur);
1721 /* Helper function: copy the new control value back to the caller */
1722 static int new_to_user(struct v4l2_ext_control *c,
1723 struct v4l2_ctrl *ctrl)
1725 return ptr_to_user(c, ctrl, ctrl->p_new);
1728 /* Helper function: copy the request value back to the caller */
1729 static int req_to_user(struct v4l2_ext_control *c,
1730 struct v4l2_ctrl_ref *ref)
1732 return ptr_to_user(c, ref->ctrl, ref->p_req);
1735 /* Helper function: copy the initial control value back to the caller */
1736 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1740 for (idx = 0; idx < ctrl->elems; idx++)
1741 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1743 return ptr_to_user(c, ctrl, ctrl->p_new);
1746 /* Helper function: copy the caller-provider value to the given control value */
1747 static int user_to_ptr(struct v4l2_ext_control *c,
1748 struct v4l2_ctrl *ctrl,
1749 union v4l2_ctrl_ptr ptr)
1755 if (ctrl->is_ptr && !ctrl->is_string) {
1758 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1759 if (ret || !ctrl->is_array)
1761 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1762 ctrl->type_ops->init(ctrl, idx, ptr);
1766 switch (ctrl->type) {
1767 case V4L2_CTRL_TYPE_INTEGER64:
1768 *ptr.p_s64 = c->value64;
1770 case V4L2_CTRL_TYPE_STRING:
1774 if (size > ctrl->maximum + 1)
1775 size = ctrl->maximum + 1;
1776 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1778 char last = ptr.p_char[size - 1];
1780 ptr.p_char[size - 1] = 0;
1781 /* If the string was longer than ctrl->maximum,
1782 then return an error. */
1783 if (strlen(ptr.p_char) == ctrl->maximum && last)
1788 *ptr.p_s32 = c->value;
1794 /* Helper function: copy the caller-provider value as the new control value */
1795 static int user_to_new(struct v4l2_ext_control *c,
1796 struct v4l2_ctrl *ctrl)
1798 return user_to_ptr(c, ctrl, ctrl->p_new);
1801 /* Copy the one value to another. */
1802 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1803 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1807 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1810 /* Copy the new value to the current value. */
1811 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1818 /* has_changed is set by cluster_changed */
1819 changed = ctrl->has_changed;
1821 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1823 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1824 /* Note: CH_FLAGS is only set for auto clusters. */
1826 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1827 if (!is_cur_manual(ctrl->cluster[0])) {
1828 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1829 if (ctrl->cluster[0]->has_volatiles)
1830 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1834 if (changed || ch_flags) {
1835 /* If a control was changed that was not one of the controls
1836 modified by the application, then send the event to all. */
1839 send_event(fh, ctrl,
1840 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1841 if (ctrl->call_notify && changed && ctrl->handler->notify)
1842 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1846 /* Copy the current value to the new value */
1847 static void cur_to_new(struct v4l2_ctrl *ctrl)
1851 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1854 /* Copy the new value to the request value */
1855 static void new_to_req(struct v4l2_ctrl_ref *ref)
1859 ptr_to_ptr(ref->ctrl, ref->ctrl->p_new, ref->p_req);
1863 /* Copy the request value to the new value */
1864 static void req_to_new(struct v4l2_ctrl_ref *ref)
1869 ptr_to_ptr(ref->ctrl, ref->req->p_req, ref->ctrl->p_new);
1871 ptr_to_ptr(ref->ctrl, ref->ctrl->p_cur, ref->ctrl->p_new);
1874 /* Return non-zero if one or more of the controls in the cluster has a new
1875 value that differs from the current value. */
1876 static int cluster_changed(struct v4l2_ctrl *master)
1878 bool changed = false;
1882 for (i = 0; i < master->ncontrols; i++) {
1883 struct v4l2_ctrl *ctrl = master->cluster[i];
1884 bool ctrl_changed = false;
1889 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1890 changed = ctrl_changed = true;
1893 * Set has_changed to false to avoid generating
1894 * the event V4L2_EVENT_CTRL_CH_VALUE
1896 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1897 ctrl->has_changed = false;
1901 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1902 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1903 ctrl->p_cur, ctrl->p_new);
1904 ctrl->has_changed = ctrl_changed;
1905 changed |= ctrl->has_changed;
1910 /* Control range checking */
1911 static int check_range(enum v4l2_ctrl_type type,
1912 s64 min, s64 max, u64 step, s64 def)
1915 case V4L2_CTRL_TYPE_BOOLEAN:
1916 if (step != 1 || max > 1 || min < 0)
1919 case V4L2_CTRL_TYPE_U8:
1920 case V4L2_CTRL_TYPE_U16:
1921 case V4L2_CTRL_TYPE_U32:
1922 case V4L2_CTRL_TYPE_INTEGER:
1923 case V4L2_CTRL_TYPE_INTEGER64:
1924 if (step == 0 || min > max || def < min || def > max)
1927 case V4L2_CTRL_TYPE_BITMASK:
1928 if (step || min || !max || (def & ~max))
1931 case V4L2_CTRL_TYPE_MENU:
1932 case V4L2_CTRL_TYPE_INTEGER_MENU:
1933 if (min > max || def < min || def > max)
1935 /* Note: step == menu_skip_mask for menu controls.
1936 So here we check if the default value is masked out. */
1937 if (step && ((1 << def) & step))
1940 case V4L2_CTRL_TYPE_STRING:
1941 if (min > max || min < 0 || step < 1 || def)
1949 /* Validate a new control */
1950 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1955 for (idx = 0; !err && idx < ctrl->elems; idx++)
1956 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1960 static inline u32 node2id(struct list_head *node)
1962 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1965 /* Set the handler's error code if it wasn't set earlier already */
1966 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1968 if (hdl->error == 0)
1973 /* Initialize the handler */
1974 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1975 unsigned nr_of_controls_hint,
1976 struct lock_class_key *key, const char *name)
1978 mutex_init(&hdl->_lock);
1979 hdl->lock = &hdl->_lock;
1980 lockdep_set_class_and_name(hdl->lock, key, name);
1981 INIT_LIST_HEAD(&hdl->ctrls);
1982 INIT_LIST_HEAD(&hdl->ctrl_refs);
1983 INIT_LIST_HEAD(&hdl->requests);
1984 INIT_LIST_HEAD(&hdl->requests_queued);
1985 hdl->request_is_queued = false;
1986 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1987 hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
1988 sizeof(hdl->buckets[0]),
1989 GFP_KERNEL | __GFP_ZERO);
1990 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1991 media_request_object_init(&hdl->req_obj);
1994 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1996 /* Free all controls and control refs */
1997 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1999 struct v4l2_ctrl_ref *ref, *next_ref;
2000 struct v4l2_ctrl *ctrl, *next_ctrl;
2001 struct v4l2_subscribed_event *sev, *next_sev;
2003 if (hdl == NULL || hdl->buckets == NULL)
2006 if (!hdl->req_obj.req && !list_empty(&hdl->requests)) {
2007 struct v4l2_ctrl_handler *req, *next_req;
2009 list_for_each_entry_safe(req, next_req, &hdl->requests, requests) {
2010 media_request_object_unbind(&req->req_obj);
2011 media_request_object_put(&req->req_obj);
2014 mutex_lock(hdl->lock);
2015 /* Free all nodes */
2016 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
2017 list_del(&ref->node);
2020 /* Free all controls owned by the handler */
2021 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
2022 list_del(&ctrl->node);
2023 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
2024 list_del(&sev->node);
2027 kvfree(hdl->buckets);
2028 hdl->buckets = NULL;
2031 mutex_unlock(hdl->lock);
2032 mutex_destroy(&hdl->_lock);
2034 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
2036 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
2037 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
2038 with applications that do not use the NEXT_CTRL flag.
2040 We just find the n-th private user control. It's O(N), but that should not
2041 be an issue in this particular case. */
2042 static struct v4l2_ctrl_ref *find_private_ref(
2043 struct v4l2_ctrl_handler *hdl, u32 id)
2045 struct v4l2_ctrl_ref *ref;
2047 id -= V4L2_CID_PRIVATE_BASE;
2048 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2049 /* Search for private user controls that are compatible with
2051 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
2052 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
2053 if (!ref->ctrl->is_int)
2063 /* Find a control with the given ID. */
2064 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
2066 struct v4l2_ctrl_ref *ref;
2069 id &= V4L2_CTRL_ID_MASK;
2071 /* Old-style private controls need special handling */
2072 if (id >= V4L2_CID_PRIVATE_BASE)
2073 return find_private_ref(hdl, id);
2074 bucket = id % hdl->nr_of_buckets;
2076 /* Simple optimization: cache the last control found */
2077 if (hdl->cached && hdl->cached->ctrl->id == id)
2080 /* Not in cache, search the hash */
2081 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
2082 while (ref && ref->ctrl->id != id)
2086 hdl->cached = ref; /* cache it! */
2090 /* Find a control with the given ID. Take the handler's lock first. */
2091 static struct v4l2_ctrl_ref *find_ref_lock(
2092 struct v4l2_ctrl_handler *hdl, u32 id)
2094 struct v4l2_ctrl_ref *ref = NULL;
2097 mutex_lock(hdl->lock);
2098 ref = find_ref(hdl, id);
2099 mutex_unlock(hdl->lock);
2104 /* Find a control with the given ID. */
2105 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
2107 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
2109 return ref ? ref->ctrl : NULL;
2111 EXPORT_SYMBOL(v4l2_ctrl_find);
2113 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
2114 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
2115 struct v4l2_ctrl *ctrl,
2116 struct v4l2_ctrl_ref **ctrl_ref,
2117 bool from_other_dev, bool allocate_req)
2119 struct v4l2_ctrl_ref *ref;
2120 struct v4l2_ctrl_ref *new_ref;
2122 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
2123 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
2124 unsigned int size_extra_req = 0;
2130 * Automatically add the control class if it is not yet present and
2131 * the new control is not a compound control.
2133 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
2134 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
2135 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
2142 size_extra_req = ctrl->elems * ctrl->elem_size;
2143 new_ref = kzalloc(sizeof(*new_ref) + size_extra_req, GFP_KERNEL);
2145 return handler_set_err(hdl, -ENOMEM);
2146 new_ref->ctrl = ctrl;
2147 new_ref->from_other_dev = from_other_dev;
2149 new_ref->p_req.p = &new_ref[1];
2151 if (ctrl->handler == hdl) {
2152 /* By default each control starts in a cluster of its own.
2153 new_ref->ctrl is basically a cluster array with one
2154 element, so that's perfect to use as the cluster pointer.
2155 But only do this for the handler that owns the control. */
2156 ctrl->cluster = &new_ref->ctrl;
2157 ctrl->ncontrols = 1;
2160 INIT_LIST_HEAD(&new_ref->node);
2162 mutex_lock(hdl->lock);
2164 /* Add immediately at the end of the list if the list is empty, or if
2165 the last element in the list has a lower ID.
2166 This ensures that when elements are added in ascending order the
2167 insertion is an O(1) operation. */
2168 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
2169 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
2170 goto insert_in_hash;
2173 /* Find insert position in sorted list */
2174 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2175 if (ref->ctrl->id < id)
2177 /* Don't add duplicates */
2178 if (ref->ctrl->id == id) {
2182 list_add(&new_ref->node, ref->node.prev);
2187 /* Insert the control node in the hash */
2188 new_ref->next = hdl->buckets[bucket];
2189 hdl->buckets[bucket] = new_ref;
2191 *ctrl_ref = new_ref;
2194 mutex_unlock(hdl->lock);
2198 /* Add a new control */
2199 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
2200 const struct v4l2_ctrl_ops *ops,
2201 const struct v4l2_ctrl_type_ops *type_ops,
2202 u32 id, const char *name, enum v4l2_ctrl_type type,
2203 s64 min, s64 max, u64 step, s64 def,
2204 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
2205 u32 flags, const char * const *qmenu,
2206 const s64 *qmenu_int, void *priv)
2208 struct v4l2_ctrl *ctrl;
2210 unsigned nr_of_dims = 0;
2213 unsigned tot_ctrl_size;
2221 while (dims && dims[nr_of_dims]) {
2222 elems *= dims[nr_of_dims];
2224 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
2227 is_array = nr_of_dims > 0;
2229 /* Prefill elem_size for all types handled by std_type_ops */
2231 case V4L2_CTRL_TYPE_INTEGER64:
2232 elem_size = sizeof(s64);
2234 case V4L2_CTRL_TYPE_STRING:
2235 elem_size = max + 1;
2237 case V4L2_CTRL_TYPE_U8:
2238 elem_size = sizeof(u8);
2240 case V4L2_CTRL_TYPE_U16:
2241 elem_size = sizeof(u16);
2243 case V4L2_CTRL_TYPE_U32:
2244 elem_size = sizeof(u32);
2246 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
2247 elem_size = sizeof(struct v4l2_ctrl_mpeg2_slice_params);
2249 case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
2250 elem_size = sizeof(struct v4l2_ctrl_mpeg2_quantization);
2253 if (type < V4L2_CTRL_COMPOUND_TYPES)
2254 elem_size = sizeof(s32);
2257 tot_ctrl_size = elem_size * elems;
2260 if (id == 0 || name == NULL || !elem_size ||
2261 id >= V4L2_CID_PRIVATE_BASE ||
2262 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2263 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2264 handler_set_err(hdl, -ERANGE);
2267 err = check_range(type, min, max, step, def);
2269 handler_set_err(hdl, err);
2273 (type == V4L2_CTRL_TYPE_BUTTON ||
2274 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2275 handler_set_err(hdl, -EINVAL);
2280 if (type == V4L2_CTRL_TYPE_BUTTON)
2281 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2282 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2283 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2284 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2285 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2286 type == V4L2_CTRL_TYPE_STRING ||
2287 type >= V4L2_CTRL_COMPOUND_TYPES ||
2289 sz_extra += 2 * tot_ctrl_size;
2291 ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2293 handler_set_err(hdl, -ENOMEM);
2297 INIT_LIST_HEAD(&ctrl->node);
2298 INIT_LIST_HEAD(&ctrl->ev_subs);
2299 ctrl->handler = hdl;
2301 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2305 ctrl->flags = flags;
2306 ctrl->minimum = min;
2307 ctrl->maximum = max;
2309 ctrl->default_value = def;
2310 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2311 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2312 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2313 ctrl->is_array = is_array;
2314 ctrl->elems = elems;
2315 ctrl->nr_of_dims = nr_of_dims;
2317 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2318 ctrl->elem_size = elem_size;
2319 if (type == V4L2_CTRL_TYPE_MENU)
2320 ctrl->qmenu = qmenu;
2321 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2322 ctrl->qmenu_int = qmenu_int;
2324 ctrl->cur.val = ctrl->val = def;
2327 if (!ctrl->is_int) {
2328 ctrl->p_new.p = data;
2329 ctrl->p_cur.p = data + tot_ctrl_size;
2331 ctrl->p_new.p = &ctrl->val;
2332 ctrl->p_cur.p = &ctrl->cur.val;
2334 for (idx = 0; idx < elems; idx++) {
2335 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2336 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2339 if (handler_new_ref(hdl, ctrl, NULL, false, false)) {
2343 mutex_lock(hdl->lock);
2344 list_add_tail(&ctrl->node, &hdl->ctrls);
2345 mutex_unlock(hdl->lock);
2349 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2350 const struct v4l2_ctrl_config *cfg, void *priv)
2353 struct v4l2_ctrl *ctrl;
2354 const char *name = cfg->name;
2355 const char * const *qmenu = cfg->qmenu;
2356 const s64 *qmenu_int = cfg->qmenu_int;
2357 enum v4l2_ctrl_type type = cfg->type;
2358 u32 flags = cfg->flags;
2361 u64 step = cfg->step;
2365 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2368 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2369 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2373 WARN_ON(cfg->menu_skip_mask);
2374 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2375 qmenu = v4l2_ctrl_get_menu(cfg->id);
2376 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2377 qmenu_int == NULL) {
2378 handler_set_err(hdl, -EINVAL);
2382 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2384 is_menu ? cfg->menu_skip_mask : step, def,
2385 cfg->dims, cfg->elem_size,
2386 flags, qmenu, qmenu_int, priv);
2388 ctrl->is_private = cfg->is_private;
2391 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2393 /* Helper function for standard non-menu controls */
2394 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2395 const struct v4l2_ctrl_ops *ops,
2396 u32 id, s64 min, s64 max, u64 step, s64 def)
2399 enum v4l2_ctrl_type type;
2402 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2403 if (type == V4L2_CTRL_TYPE_MENU ||
2404 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2405 type >= V4L2_CTRL_COMPOUND_TYPES) {
2406 handler_set_err(hdl, -EINVAL);
2409 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2410 min, max, step, def, NULL, 0,
2411 flags, NULL, NULL, NULL);
2413 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2415 /* Helper function for standard menu controls */
2416 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2417 const struct v4l2_ctrl_ops *ops,
2418 u32 id, u8 _max, u64 mask, u8 _def)
2420 const char * const *qmenu = NULL;
2421 const s64 *qmenu_int = NULL;
2422 unsigned int qmenu_int_len = 0;
2424 enum v4l2_ctrl_type type;
2431 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2433 if (type == V4L2_CTRL_TYPE_MENU)
2434 qmenu = v4l2_ctrl_get_menu(id);
2435 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2436 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2438 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2439 handler_set_err(hdl, -EINVAL);
2442 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2443 0, max, mask, def, NULL, 0,
2444 flags, qmenu, qmenu_int, NULL);
2446 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2448 /* Helper function for standard menu controls with driver defined menu */
2449 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2450 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2451 u64 mask, u8 _def, const char * const *qmenu)
2453 enum v4l2_ctrl_type type;
2461 /* v4l2_ctrl_new_std_menu_items() should only be called for
2462 * standard controls without a standard menu.
2464 if (v4l2_ctrl_get_menu(id)) {
2465 handler_set_err(hdl, -EINVAL);
2469 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2470 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2471 handler_set_err(hdl, -EINVAL);
2474 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2475 0, max, mask, def, NULL, 0,
2476 flags, qmenu, NULL, NULL);
2479 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2481 /* Helper function for standard integer menu controls */
2482 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2483 const struct v4l2_ctrl_ops *ops,
2484 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2487 enum v4l2_ctrl_type type;
2494 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2495 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2496 handler_set_err(hdl, -EINVAL);
2499 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2500 0, max, 0, def, NULL, 0,
2501 flags, NULL, qmenu_int, NULL);
2503 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2505 /* Add the controls from another handler to our own. */
2506 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2507 struct v4l2_ctrl_handler *add,
2508 bool (*filter)(const struct v4l2_ctrl *ctrl),
2509 bool from_other_dev)
2511 struct v4l2_ctrl_ref *ref;
2514 /* Do nothing if either handler is NULL or if they are the same */
2515 if (!hdl || !add || hdl == add)
2519 mutex_lock(add->lock);
2520 list_for_each_entry(ref, &add->ctrl_refs, node) {
2521 struct v4l2_ctrl *ctrl = ref->ctrl;
2523 /* Skip handler-private controls. */
2524 if (ctrl->is_private)
2526 /* And control classes */
2527 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2529 /* Filter any unwanted controls */
2530 if (filter && !filter(ctrl))
2532 ret = handler_new_ref(hdl, ctrl, NULL, from_other_dev, false);
2536 mutex_unlock(add->lock);
2539 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2541 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2543 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2545 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2548 case V4L2_CID_AUDIO_MUTE:
2549 case V4L2_CID_AUDIO_VOLUME:
2550 case V4L2_CID_AUDIO_BALANCE:
2551 case V4L2_CID_AUDIO_BASS:
2552 case V4L2_CID_AUDIO_TREBLE:
2553 case V4L2_CID_AUDIO_LOUDNESS:
2560 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2562 /* Cluster controls */
2563 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2565 bool has_volatiles = false;
2568 /* The first control is the master control and it must not be NULL */
2569 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2572 for (i = 0; i < ncontrols; i++) {
2574 controls[i]->cluster = controls;
2575 controls[i]->ncontrols = ncontrols;
2576 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2577 has_volatiles = true;
2580 controls[0]->has_volatiles = has_volatiles;
2582 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2584 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2585 u8 manual_val, bool set_volatile)
2587 struct v4l2_ctrl *master = controls[0];
2591 v4l2_ctrl_cluster(ncontrols, controls);
2592 WARN_ON(ncontrols <= 1);
2593 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2594 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2595 master->is_auto = true;
2596 master->has_volatiles = set_volatile;
2597 master->manual_mode_value = manual_val;
2598 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2600 if (!is_cur_manual(master))
2601 flag = V4L2_CTRL_FLAG_INACTIVE |
2602 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2604 for (i = 1; i < ncontrols; i++)
2606 controls[i]->flags |= flag;
2608 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2610 /* Activate/deactivate a control. */
2611 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2613 /* invert since the actual flag is called 'inactive' */
2614 bool inactive = !active;
2621 /* set V4L2_CTRL_FLAG_INACTIVE */
2622 old = test_and_set_bit(4, &ctrl->flags);
2624 /* clear V4L2_CTRL_FLAG_INACTIVE */
2625 old = test_and_clear_bit(4, &ctrl->flags);
2626 if (old != inactive)
2627 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2629 EXPORT_SYMBOL(v4l2_ctrl_activate);
2631 void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2638 lockdep_assert_held(ctrl->handler->lock);
2641 /* set V4L2_CTRL_FLAG_GRABBED */
2642 old = test_and_set_bit(1, &ctrl->flags);
2644 /* clear V4L2_CTRL_FLAG_GRABBED */
2645 old = test_and_clear_bit(1, &ctrl->flags);
2647 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2649 EXPORT_SYMBOL(__v4l2_ctrl_grab);
2651 /* Log the control name and value */
2652 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2653 const char *prefix, const char *colon)
2655 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2657 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2660 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2662 ctrl->type_ops->log(ctrl);
2664 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2665 V4L2_CTRL_FLAG_GRABBED |
2666 V4L2_CTRL_FLAG_VOLATILE)) {
2667 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2668 pr_cont(" inactive");
2669 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2670 pr_cont(" grabbed");
2671 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2672 pr_cont(" volatile");
2677 /* Log all controls owned by the handler */
2678 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2681 struct v4l2_ctrl *ctrl;
2682 const char *colon = "";
2689 len = strlen(prefix);
2690 if (len && prefix[len - 1] != ' ')
2692 mutex_lock(hdl->lock);
2693 list_for_each_entry(ctrl, &hdl->ctrls, node)
2694 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2695 log_ctrl(ctrl, prefix, colon);
2696 mutex_unlock(hdl->lock);
2698 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2700 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2702 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2705 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2707 /* Call s_ctrl for all controls owned by the handler */
2708 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2710 struct v4l2_ctrl *ctrl;
2716 lockdep_assert_held(hdl->lock);
2718 list_for_each_entry(ctrl, &hdl->ctrls, node)
2721 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2722 struct v4l2_ctrl *master = ctrl->cluster[0];
2725 /* Skip if this control was already handled by a cluster. */
2726 /* Skip button controls and read-only controls. */
2727 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2728 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2731 for (i = 0; i < master->ncontrols; i++) {
2732 if (master->cluster[i]) {
2733 cur_to_new(master->cluster[i]);
2734 master->cluster[i]->is_new = 1;
2735 master->cluster[i]->done = true;
2738 ret = call_op(master, s_ctrl);
2745 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
2747 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2754 mutex_lock(hdl->lock);
2755 ret = __v4l2_ctrl_handler_setup(hdl);
2756 mutex_unlock(hdl->lock);
2760 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2762 /* Implement VIDIOC_QUERY_EXT_CTRL */
2763 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2765 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2766 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2767 struct v4l2_ctrl_ref *ref;
2768 struct v4l2_ctrl *ctrl;
2773 mutex_lock(hdl->lock);
2775 /* Try to find it */
2776 ref = find_ref(hdl, id);
2778 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2780 /* Match any control that is not hidden */
2784 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2785 /* Match any hidden control */
2787 } else if ((qc->id & next_flags) == next_flags) {
2788 /* Match any control, compound or not */
2792 /* Find the next control with ID > qc->id */
2794 /* Did we reach the end of the control list? */
2795 if (id >= node2id(hdl->ctrl_refs.prev)) {
2796 ref = NULL; /* Yes, so there is no next control */
2798 /* We found a control with the given ID, so just get
2799 the next valid one in the list. */
2800 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2801 is_compound = ref->ctrl->is_array ||
2802 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2803 if (id < ref->ctrl->id &&
2804 (is_compound & mask) == match)
2807 if (&ref->node == &hdl->ctrl_refs)
2810 /* No control with the given ID exists, so start
2811 searching for the next largest ID. We know there
2812 is one, otherwise the first 'if' above would have
2814 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2815 is_compound = ref->ctrl->is_array ||
2816 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2817 if (id < ref->ctrl->id &&
2818 (is_compound & mask) == match)
2821 if (&ref->node == &hdl->ctrl_refs)
2825 mutex_unlock(hdl->lock);
2831 memset(qc, 0, sizeof(*qc));
2832 if (id >= V4L2_CID_PRIVATE_BASE)
2836 strscpy(qc->name, ctrl->name, sizeof(qc->name));
2837 qc->flags = user_flags(ctrl);
2838 qc->type = ctrl->type;
2839 qc->elem_size = ctrl->elem_size;
2840 qc->elems = ctrl->elems;
2841 qc->nr_of_dims = ctrl->nr_of_dims;
2842 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2843 qc->minimum = ctrl->minimum;
2844 qc->maximum = ctrl->maximum;
2845 qc->default_value = ctrl->default_value;
2846 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2847 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2850 qc->step = ctrl->step;
2853 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2855 /* Implement VIDIOC_QUERYCTRL */
2856 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2858 struct v4l2_query_ext_ctrl qec = { qc->id };
2861 rc = v4l2_query_ext_ctrl(hdl, &qec);
2866 qc->type = qec.type;
2867 qc->flags = qec.flags;
2868 strscpy(qc->name, qec.name, sizeof(qc->name));
2870 case V4L2_CTRL_TYPE_INTEGER:
2871 case V4L2_CTRL_TYPE_BOOLEAN:
2872 case V4L2_CTRL_TYPE_MENU:
2873 case V4L2_CTRL_TYPE_INTEGER_MENU:
2874 case V4L2_CTRL_TYPE_STRING:
2875 case V4L2_CTRL_TYPE_BITMASK:
2876 qc->minimum = qec.minimum;
2877 qc->maximum = qec.maximum;
2878 qc->step = qec.step;
2879 qc->default_value = qec.default_value;
2885 qc->default_value = 0;
2890 EXPORT_SYMBOL(v4l2_queryctrl);
2892 /* Implement VIDIOC_QUERYMENU */
2893 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2895 struct v4l2_ctrl *ctrl;
2898 ctrl = v4l2_ctrl_find(hdl, qm->id);
2904 switch (ctrl->type) {
2905 case V4L2_CTRL_TYPE_MENU:
2906 if (ctrl->qmenu == NULL)
2909 case V4L2_CTRL_TYPE_INTEGER_MENU:
2910 if (ctrl->qmenu_int == NULL)
2917 if (i < ctrl->minimum || i > ctrl->maximum)
2920 /* Use mask to see if this menu item should be skipped */
2921 if (ctrl->menu_skip_mask & (1 << i))
2923 /* Empty menu items should also be skipped */
2924 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2925 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2927 strscpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2929 qm->value = ctrl->qmenu_int[i];
2933 EXPORT_SYMBOL(v4l2_querymenu);
2935 static int v4l2_ctrl_request_clone(struct v4l2_ctrl_handler *hdl,
2936 const struct v4l2_ctrl_handler *from)
2938 struct v4l2_ctrl_ref *ref;
2941 if (WARN_ON(!hdl || hdl == from))
2947 WARN_ON(hdl->lock != &hdl->_lock);
2949 mutex_lock(from->lock);
2950 list_for_each_entry(ref, &from->ctrl_refs, node) {
2951 struct v4l2_ctrl *ctrl = ref->ctrl;
2952 struct v4l2_ctrl_ref *new_ref;
2954 /* Skip refs inherited from other devices */
2955 if (ref->from_other_dev)
2958 if (ctrl->type == V4L2_CTRL_TYPE_BUTTON)
2960 err = handler_new_ref(hdl, ctrl, &new_ref, false, true);
2964 mutex_unlock(from->lock);
2968 static void v4l2_ctrl_request_queue(struct media_request_object *obj)
2970 struct v4l2_ctrl_handler *hdl =
2971 container_of(obj, struct v4l2_ctrl_handler, req_obj);
2972 struct v4l2_ctrl_handler *main_hdl = obj->priv;
2973 struct v4l2_ctrl_handler *prev_hdl = NULL;
2974 struct v4l2_ctrl_ref *ref_ctrl, *ref_ctrl_prev = NULL;
2976 if (list_empty(&main_hdl->requests_queued))
2979 prev_hdl = list_last_entry(&main_hdl->requests_queued,
2980 struct v4l2_ctrl_handler, requests_queued);
2982 * Note: prev_hdl and hdl must contain the same list of control
2983 * references, so if any differences are detected then that is a
2984 * driver bug and the WARN_ON is triggered.
2986 mutex_lock(prev_hdl->lock);
2987 ref_ctrl_prev = list_first_entry(&prev_hdl->ctrl_refs,
2988 struct v4l2_ctrl_ref, node);
2989 list_for_each_entry(ref_ctrl, &hdl->ctrl_refs, node) {
2992 while (ref_ctrl_prev->ctrl->id < ref_ctrl->ctrl->id) {
2993 /* Should never happen, but just in case... */
2994 if (list_is_last(&ref_ctrl_prev->node,
2995 &prev_hdl->ctrl_refs))
2997 ref_ctrl_prev = list_next_entry(ref_ctrl_prev, node);
2999 if (WARN_ON(ref_ctrl_prev->ctrl->id != ref_ctrl->ctrl->id))
3001 ref_ctrl->req = ref_ctrl_prev->req;
3003 mutex_unlock(prev_hdl->lock);
3005 list_add_tail(&hdl->requests_queued, &main_hdl->requests_queued);
3006 hdl->request_is_queued = true;
3009 static void v4l2_ctrl_request_unbind(struct media_request_object *obj)
3011 struct v4l2_ctrl_handler *hdl =
3012 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3014 list_del_init(&hdl->requests);
3015 if (hdl->request_is_queued) {
3016 list_del_init(&hdl->requests_queued);
3017 hdl->request_is_queued = false;
3021 static void v4l2_ctrl_request_release(struct media_request_object *obj)
3023 struct v4l2_ctrl_handler *hdl =
3024 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3026 v4l2_ctrl_handler_free(hdl);
3030 static const struct media_request_object_ops req_ops = {
3031 .queue = v4l2_ctrl_request_queue,
3032 .unbind = v4l2_ctrl_request_unbind,
3033 .release = v4l2_ctrl_request_release,
3036 struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
3037 struct v4l2_ctrl_handler *parent)
3039 struct media_request_object *obj;
3041 if (WARN_ON(req->state != MEDIA_REQUEST_STATE_VALIDATING &&
3042 req->state != MEDIA_REQUEST_STATE_QUEUED))
3045 obj = media_request_object_find(req, &req_ops, parent);
3047 return container_of(obj, struct v4l2_ctrl_handler, req_obj);
3050 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_find);
3053 v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
3055 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
3057 return (ref && ref->req == ref) ? ref->ctrl : NULL;
3059 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_ctrl_find);
3061 static int v4l2_ctrl_request_bind(struct media_request *req,
3062 struct v4l2_ctrl_handler *hdl,
3063 struct v4l2_ctrl_handler *from)
3067 ret = v4l2_ctrl_request_clone(hdl, from);
3070 ret = media_request_object_bind(req, &req_ops,
3071 from, false, &hdl->req_obj);
3073 list_add_tail(&hdl->requests, &from->requests);
3078 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
3080 It is not a fully atomic operation, just best-effort only. After all, if
3081 multiple controls have to be set through multiple i2c writes (for example)
3082 then some initial writes may succeed while others fail. Thus leaving the
3083 system in an inconsistent state. The question is how much effort you are
3084 willing to spend on trying to make something atomic that really isn't.
3086 From the point of view of an application the main requirement is that
3087 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
3088 error should be returned without actually affecting any controls.
3090 If all the values are correct, then it is acceptable to just give up
3091 in case of low-level errors.
3093 It is important though that the application can tell when only a partial
3094 configuration was done. The way we do that is through the error_idx field
3095 of struct v4l2_ext_controls: if that is equal to the count field then no
3096 controls were affected. Otherwise all controls before that index were
3097 successful in performing their 'get' or 'set' operation, the control at
3098 the given index failed, and you don't know what happened with the controls
3099 after the failed one. Since if they were part of a control cluster they
3100 could have been successfully processed (if a cluster member was encountered
3101 at index < error_idx), they could have failed (if a cluster member was at
3102 error_idx), or they may not have been processed yet (if the first cluster
3103 member appeared after error_idx).
3105 It is all fairly theoretical, though. In practice all you can do is to
3106 bail out. If error_idx == count, then it is an application bug. If
3107 error_idx < count then it is only an application bug if the error code was
3108 EBUSY. That usually means that something started streaming just when you
3109 tried to set the controls. In all other cases it is a driver/hardware
3110 problem and all you can do is to retry or bail out.
3112 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
3113 never modifies controls the error_idx is just set to whatever control
3114 has an invalid value.
3117 /* Prepare for the extended g/s/try functions.
3118 Find the controls in the control array and do some basic checks. */
3119 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
3120 struct v4l2_ext_controls *cs,
3121 struct v4l2_ctrl_helper *helpers,
3124 struct v4l2_ctrl_helper *h;
3125 bool have_clusters = false;
3128 for (i = 0, h = helpers; i < cs->count; i++, h++) {
3129 struct v4l2_ext_control *c = &cs->controls[i];
3130 struct v4l2_ctrl_ref *ref;
3131 struct v4l2_ctrl *ctrl;
3132 u32 id = c->id & V4L2_CTRL_ID_MASK;
3137 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
3138 cs->which != V4L2_CTRL_WHICH_REQUEST_VAL &&
3139 V4L2_CTRL_ID2WHICH(id) != cs->which)
3142 /* Old-style private controls are not allowed for
3143 extended controls */
3144 if (id >= V4L2_CID_PRIVATE_BASE)
3146 ref = find_ref_lock(hdl, id);
3151 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
3154 if (ctrl->cluster[0]->ncontrols > 1)
3155 have_clusters = true;
3156 if (ctrl->cluster[0] != ctrl)
3157 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
3158 if (ctrl->is_ptr && !ctrl->is_string) {
3159 unsigned tot_size = ctrl->elems * ctrl->elem_size;
3161 if (c->size < tot_size) {
3170 /* Store the ref to the master control of the cluster */
3172 /* Initially set next to 0, meaning that there is no other
3173 control in this helper array belonging to the same
3178 /* We are done if there were no controls that belong to a multi-
3183 /* The code below figures out in O(n) time which controls in the list
3184 belong to the same cluster. */
3186 /* This has to be done with the handler lock taken. */
3187 mutex_lock(hdl->lock);
3189 /* First zero the helper field in the master control references */
3190 for (i = 0; i < cs->count; i++)
3191 helpers[i].mref->helper = NULL;
3192 for (i = 0, h = helpers; i < cs->count; i++, h++) {
3193 struct v4l2_ctrl_ref *mref = h->mref;
3195 /* If the mref->helper is set, then it points to an earlier
3196 helper that belongs to the same cluster. */
3198 /* Set the next field of mref->helper to the current
3199 index: this means that that earlier helper now
3200 points to the next helper in the same cluster. */
3201 mref->helper->next = i;
3202 /* mref should be set only for the first helper in the
3203 cluster, clear the others. */
3206 /* Point the mref helper to the current helper struct. */
3209 mutex_unlock(hdl->lock);
3213 /* Handles the corner case where cs->count == 0. It checks whether the
3214 specified control class exists. If that class ID is 0, then it checks
3215 whether there are any controls at all. */
3216 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
3218 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL ||
3219 which == V4L2_CTRL_WHICH_REQUEST_VAL)
3221 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
3224 /* Get extended controls. Allocates the helpers array if needed. */
3225 static int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl,
3226 struct v4l2_ext_controls *cs)
3228 struct v4l2_ctrl_helper helper[4];
3229 struct v4l2_ctrl_helper *helpers = helper;
3234 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
3236 cs->error_idx = cs->count;
3237 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3243 return class_check(hdl, cs->which);
3245 if (cs->count > ARRAY_SIZE(helper)) {
3246 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3248 if (helpers == NULL)
3252 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
3253 cs->error_idx = cs->count;
3255 for (i = 0; !ret && i < cs->count; i++)
3256 if (helpers[i].ref->ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3259 for (i = 0; !ret && i < cs->count; i++) {
3260 int (*ctrl_to_user)(struct v4l2_ext_control *c,
3261 struct v4l2_ctrl *ctrl);
3262 struct v4l2_ctrl *master;
3264 ctrl_to_user = def_value ? def_to_user : cur_to_user;
3266 if (helpers[i].mref == NULL)
3269 master = helpers[i].mref->ctrl;
3272 v4l2_ctrl_lock(master);
3274 /* g_volatile_ctrl will update the new control values */
3276 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
3277 (master->has_volatiles && !is_cur_manual(master)))) {
3278 for (j = 0; j < master->ncontrols; j++)
3279 cur_to_new(master->cluster[j]);
3280 ret = call_op(master, g_volatile_ctrl);
3281 ctrl_to_user = new_to_user;
3283 /* If OK, then copy the current (for non-volatile controls)
3284 or the new (for volatile controls) control values to the
3290 if (helpers[idx].ref->req)
3291 ret = req_to_user(cs->controls + idx,
3292 helpers[idx].ref->req);
3294 ret = ctrl_to_user(cs->controls + idx,
3295 helpers[idx].ref->ctrl);
3296 idx = helpers[idx].next;
3297 } while (!ret && idx);
3299 v4l2_ctrl_unlock(master);
3302 if (cs->count > ARRAY_SIZE(helper))
3307 static struct media_request_object *
3308 v4l2_ctrls_find_req_obj(struct v4l2_ctrl_handler *hdl,
3309 struct media_request *req, bool set)
3311 struct media_request_object *obj;
3312 struct v4l2_ctrl_handler *new_hdl;
3316 return ERR_CAST(req);
3318 if (set && WARN_ON(req->state != MEDIA_REQUEST_STATE_UPDATING))
3319 return ERR_PTR(-EBUSY);
3321 obj = media_request_object_find(req, &req_ops, hdl);
3325 return ERR_PTR(-ENOENT);
3327 new_hdl = kzalloc(sizeof(*new_hdl), GFP_KERNEL);
3329 return ERR_PTR(-ENOMEM);
3331 obj = &new_hdl->req_obj;
3332 ret = v4l2_ctrl_handler_init(new_hdl, (hdl->nr_of_buckets - 1) * 8);
3334 ret = v4l2_ctrl_request_bind(req, new_hdl, hdl);
3338 return ERR_PTR(ret);
3341 media_request_object_get(obj);
3345 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3346 struct v4l2_ext_controls *cs)
3348 struct media_request_object *obj = NULL;
3349 struct media_request *req = NULL;
3352 if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3353 if (!mdev || cs->request_fd < 0)
3356 req = media_request_get_by_fd(mdev, cs->request_fd);
3358 return PTR_ERR(req);
3360 if (req->state != MEDIA_REQUEST_STATE_COMPLETE) {
3361 media_request_put(req);
3365 ret = media_request_lock_for_access(req);
3367 media_request_put(req);
3371 obj = v4l2_ctrls_find_req_obj(hdl, req, false);
3373 media_request_unlock_for_access(req);
3374 media_request_put(req);
3375 return PTR_ERR(obj);
3378 hdl = container_of(obj, struct v4l2_ctrl_handler,
3382 ret = v4l2_g_ext_ctrls_common(hdl, cs);
3385 media_request_unlock_for_access(req);
3386 media_request_object_put(obj);
3387 media_request_put(req);
3391 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
3393 /* Helper function to get a single control */
3394 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
3396 struct v4l2_ctrl *master = ctrl->cluster[0];
3400 /* Compound controls are not supported. The new_to_user() and
3401 * cur_to_user() calls below would need to be modified not to access
3402 * userspace memory when called from get_ctrl().
3404 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
3407 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3410 v4l2_ctrl_lock(master);
3411 /* g_volatile_ctrl will update the current control values */
3412 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3413 for (i = 0; i < master->ncontrols; i++)
3414 cur_to_new(master->cluster[i]);
3415 ret = call_op(master, g_volatile_ctrl);
3416 new_to_user(c, ctrl);
3418 cur_to_user(c, ctrl);
3420 v4l2_ctrl_unlock(master);
3424 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
3426 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3427 struct v4l2_ext_control c;
3430 if (ctrl == NULL || !ctrl->is_int)
3432 ret = get_ctrl(ctrl, &c);
3433 control->value = c.value;
3436 EXPORT_SYMBOL(v4l2_g_ctrl);
3438 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
3440 struct v4l2_ext_control c;
3442 /* It's a driver bug if this happens. */
3443 WARN_ON(!ctrl->is_int);
3448 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
3450 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
3452 struct v4l2_ext_control c;
3454 /* It's a driver bug if this happens. */
3455 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3460 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
3463 /* Core function that calls try/s_ctrl and ensures that the new value is
3464 copied to the current value on a set.
3465 Must be called with ctrl->handler->lock held. */
3466 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
3467 bool set, u32 ch_flags)
3473 /* Go through the cluster and either validate the new value or
3474 (if no new value was set), copy the current value to the new
3475 value, ensuring a consistent view for the control ops when
3477 for (i = 0; i < master->ncontrols; i++) {
3478 struct v4l2_ctrl *ctrl = master->cluster[i];
3483 if (!ctrl->is_new) {
3487 /* Check again: it may have changed since the
3488 previous check in try_or_set_ext_ctrls(). */
3489 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3493 ret = call_op(master, try_ctrl);
3495 /* Don't set if there is no change */
3496 if (ret || !set || !cluster_changed(master))
3498 ret = call_op(master, s_ctrl);
3502 /* If OK, then make the new values permanent. */
3503 update_flag = is_cur_manual(master) != is_new_manual(master);
3505 for (i = 0; i < master->ncontrols; i++) {
3507 * If we switch from auto to manual mode, and this cluster
3508 * contains volatile controls, then all non-master controls
3509 * have to be marked as changed. The 'new' value contains
3510 * the volatile value (obtained by update_from_auto_cluster),
3511 * which now has to become the current value.
3513 if (i && update_flag && is_new_manual(master) &&
3514 master->has_volatiles && master->cluster[i])
3515 master->cluster[i]->has_changed = true;
3517 new_to_cur(fh, master->cluster[i], ch_flags |
3518 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3523 /* Validate controls. */
3524 static int validate_ctrls(struct v4l2_ext_controls *cs,
3525 struct v4l2_ctrl_helper *helpers, bool set)
3530 cs->error_idx = cs->count;
3531 for (i = 0; i < cs->count; i++) {
3532 struct v4l2_ctrl *ctrl = helpers[i].ref->ctrl;
3533 union v4l2_ctrl_ptr p_new;
3537 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3539 /* This test is also done in try_set_control_cluster() which
3540 is called in atomic context, so that has the final say,
3541 but it makes sense to do an up-front check as well. Once
3542 an error occurs in try_set_control_cluster() some other
3543 controls may have been set already and we want to do a
3544 best-effort to avoid that. */
3545 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3548 * Skip validation for now if the payload needs to be copied
3549 * from userspace into kernelspace. We'll validate those later.
3553 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3554 p_new.p_s64 = &cs->controls[i].value64;
3556 p_new.p_s32 = &cs->controls[i].value;
3557 ret = validate_new(ctrl, p_new);
3564 /* Obtain the current volatile values of an autocluster and mark them
3566 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3570 for (i = 1; i < master->ncontrols; i++)
3571 cur_to_new(master->cluster[i]);
3572 if (!call_op(master, g_volatile_ctrl))
3573 for (i = 1; i < master->ncontrols; i++)
3574 if (master->cluster[i])
3575 master->cluster[i]->is_new = 1;
3578 /* Try or try-and-set controls */
3579 static int try_set_ext_ctrls_common(struct v4l2_fh *fh,
3580 struct v4l2_ctrl_handler *hdl,
3581 struct v4l2_ext_controls *cs, bool set)
3583 struct v4l2_ctrl_helper helper[4];
3584 struct v4l2_ctrl_helper *helpers = helper;
3588 cs->error_idx = cs->count;
3590 /* Default value cannot be changed */
3591 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3594 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3600 return class_check(hdl, cs->which);
3602 if (cs->count > ARRAY_SIZE(helper)) {
3603 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3608 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3610 ret = validate_ctrls(cs, helpers, set);
3612 cs->error_idx = cs->count;
3613 for (i = 0; !ret && i < cs->count; i++) {
3614 struct v4l2_ctrl *master;
3617 if (helpers[i].mref == NULL)
3621 master = helpers[i].mref->ctrl;
3622 v4l2_ctrl_lock(master);
3624 /* Reset the 'is_new' flags of the cluster */
3625 for (j = 0; j < master->ncontrols; j++)
3626 if (master->cluster[j])
3627 master->cluster[j]->is_new = 0;
3629 /* For volatile autoclusters that are currently in auto mode
3630 we need to discover if it will be set to manual mode.
3631 If so, then we have to copy the current volatile values
3632 first since those will become the new manual values (which
3633 may be overwritten by explicit new values from this set
3635 if (master->is_auto && master->has_volatiles &&
3636 !is_cur_manual(master)) {
3637 /* Pick an initial non-manual value */
3638 s32 new_auto_val = master->manual_mode_value + 1;
3642 /* Check if the auto control is part of the
3643 list, and remember the new value. */
3644 if (helpers[tmp_idx].ref->ctrl == master)
3645 new_auto_val = cs->controls[tmp_idx].value;
3646 tmp_idx = helpers[tmp_idx].next;
3648 /* If the new value == the manual value, then copy
3649 the current volatile values. */
3650 if (new_auto_val == master->manual_mode_value)
3651 update_from_auto_cluster(master);
3654 /* Copy the new caller-supplied control values.
3655 user_to_new() sets 'is_new' to 1. */
3657 struct v4l2_ctrl *ctrl = helpers[idx].ref->ctrl;
3659 ret = user_to_new(cs->controls + idx, ctrl);
3660 if (!ret && ctrl->is_ptr)
3661 ret = validate_new(ctrl, ctrl->p_new);
3662 idx = helpers[idx].next;
3663 } while (!ret && idx);
3666 ret = try_or_set_cluster(fh, master,
3667 !hdl->req_obj.req && set, 0);
3668 if (!ret && hdl->req_obj.req && set) {
3669 for (j = 0; j < master->ncontrols; j++) {
3670 struct v4l2_ctrl_ref *ref =
3671 find_ref(hdl, master->cluster[j]->id);
3677 /* Copy the new values back to userspace. */
3681 ret = new_to_user(cs->controls + idx,
3682 helpers[idx].ref->ctrl);
3683 idx = helpers[idx].next;
3684 } while (!ret && idx);
3686 v4l2_ctrl_unlock(master);
3689 if (cs->count > ARRAY_SIZE(helper))
3694 static int try_set_ext_ctrls(struct v4l2_fh *fh,
3695 struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3696 struct v4l2_ext_controls *cs, bool set)
3698 struct media_request_object *obj = NULL;
3699 struct media_request *req = NULL;
3702 if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3703 if (!mdev || cs->request_fd < 0)
3706 req = media_request_get_by_fd(mdev, cs->request_fd);
3708 return PTR_ERR(req);
3710 ret = media_request_lock_for_update(req);
3712 media_request_put(req);
3716 obj = v4l2_ctrls_find_req_obj(hdl, req, set);
3718 media_request_unlock_for_update(req);
3719 media_request_put(req);
3720 return PTR_ERR(obj);
3722 hdl = container_of(obj, struct v4l2_ctrl_handler,
3726 ret = try_set_ext_ctrls_common(fh, hdl, cs, set);
3729 media_request_unlock_for_update(req);
3730 media_request_object_put(obj);
3731 media_request_put(req);
3737 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3738 struct v4l2_ext_controls *cs)
3740 return try_set_ext_ctrls(NULL, hdl, mdev, cs, false);
3742 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3744 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3745 struct media_device *mdev, struct v4l2_ext_controls *cs)
3747 return try_set_ext_ctrls(fh, hdl, mdev, cs, true);
3749 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3751 /* Helper function for VIDIOC_S_CTRL compatibility */
3752 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3754 struct v4l2_ctrl *master = ctrl->cluster[0];
3758 /* Reset the 'is_new' flags of the cluster */
3759 for (i = 0; i < master->ncontrols; i++)
3760 if (master->cluster[i])
3761 master->cluster[i]->is_new = 0;
3763 ret = validate_new(ctrl, ctrl->p_new);
3767 /* For autoclusters with volatiles that are switched from auto to
3768 manual mode we have to update the current volatile values since
3769 those will become the initial manual values after such a switch. */
3770 if (master->is_auto && master->has_volatiles && ctrl == master &&
3771 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3772 update_from_auto_cluster(master);
3775 return try_or_set_cluster(fh, master, true, ch_flags);
3778 /* Helper function for VIDIOC_S_CTRL compatibility */
3779 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3780 struct v4l2_ext_control *c)
3784 v4l2_ctrl_lock(ctrl);
3785 user_to_new(c, ctrl);
3786 ret = set_ctrl(fh, ctrl, 0);
3788 cur_to_user(c, ctrl);
3789 v4l2_ctrl_unlock(ctrl);
3793 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3794 struct v4l2_control *control)
3796 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3797 struct v4l2_ext_control c = { control->id };
3800 if (ctrl == NULL || !ctrl->is_int)
3803 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3806 c.value = control->value;
3807 ret = set_ctrl_lock(fh, ctrl, &c);
3808 control->value = c.value;
3811 EXPORT_SYMBOL(v4l2_s_ctrl);
3813 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3815 lockdep_assert_held(ctrl->handler->lock);
3817 /* It's a driver bug if this happens. */
3818 WARN_ON(!ctrl->is_int);
3820 return set_ctrl(NULL, ctrl, 0);
3822 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3824 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3826 lockdep_assert_held(ctrl->handler->lock);
3828 /* It's a driver bug if this happens. */
3829 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3830 *ctrl->p_new.p_s64 = val;
3831 return set_ctrl(NULL, ctrl, 0);
3833 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3835 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3837 lockdep_assert_held(ctrl->handler->lock);
3839 /* It's a driver bug if this happens. */
3840 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3841 strscpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3842 return set_ctrl(NULL, ctrl, 0);
3844 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3846 void v4l2_ctrl_request_complete(struct media_request *req,
3847 struct v4l2_ctrl_handler *main_hdl)
3849 struct media_request_object *obj;
3850 struct v4l2_ctrl_handler *hdl;
3851 struct v4l2_ctrl_ref *ref;
3853 if (!req || !main_hdl)
3857 * Note that it is valid if nothing was found. It means
3858 * that this request doesn't have any controls and so just
3859 * wants to leave the controls unchanged.
3861 obj = media_request_object_find(req, &req_ops, main_hdl);
3864 hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
3866 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
3867 struct v4l2_ctrl *ctrl = ref->ctrl;
3868 struct v4l2_ctrl *master = ctrl->cluster[0];
3871 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3874 v4l2_ctrl_lock(master);
3875 /* g_volatile_ctrl will update the current control values */
3876 for (i = 0; i < master->ncontrols; i++)
3877 cur_to_new(master->cluster[i]);
3878 call_op(master, g_volatile_ctrl);
3880 v4l2_ctrl_unlock(master);
3883 if (ref->req == ref)
3886 v4l2_ctrl_lock(ctrl);
3888 ptr_to_ptr(ctrl, ref->req->p_req, ref->p_req);
3890 ptr_to_ptr(ctrl, ctrl->p_cur, ref->p_req);
3891 v4l2_ctrl_unlock(ctrl);
3894 WARN_ON(!hdl->request_is_queued);
3895 list_del_init(&hdl->requests_queued);
3896 hdl->request_is_queued = false;
3897 media_request_object_complete(obj);
3898 media_request_object_put(obj);
3900 EXPORT_SYMBOL(v4l2_ctrl_request_complete);
3902 void v4l2_ctrl_request_setup(struct media_request *req,
3903 struct v4l2_ctrl_handler *main_hdl)
3905 struct media_request_object *obj;
3906 struct v4l2_ctrl_handler *hdl;
3907 struct v4l2_ctrl_ref *ref;
3909 if (!req || !main_hdl)
3912 if (WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED))
3916 * Note that it is valid if nothing was found. It means
3917 * that this request doesn't have any controls and so just
3918 * wants to leave the controls unchanged.
3920 obj = media_request_object_find(req, &req_ops, main_hdl);
3923 if (obj->completed) {
3924 media_request_object_put(obj);
3927 hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
3929 list_for_each_entry(ref, &hdl->ctrl_refs, node)
3930 ref->req_done = false;
3932 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
3933 struct v4l2_ctrl *ctrl = ref->ctrl;
3934 struct v4l2_ctrl *master = ctrl->cluster[0];
3935 bool have_new_data = false;
3939 * Skip if this control was already handled by a cluster.
3940 * Skip button controls and read-only controls.
3942 if (ref->req_done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
3943 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
3946 v4l2_ctrl_lock(master);
3947 for (i = 0; i < master->ncontrols; i++) {
3948 if (master->cluster[i]) {
3949 struct v4l2_ctrl_ref *r =
3950 find_ref(hdl, master->cluster[i]->id);
3952 if (r->req && r == r->req) {
3953 have_new_data = true;
3958 if (!have_new_data) {
3959 v4l2_ctrl_unlock(master);
3963 for (i = 0; i < master->ncontrols; i++) {
3964 if (master->cluster[i]) {
3965 struct v4l2_ctrl_ref *r =
3966 find_ref(hdl, master->cluster[i]->id);
3969 master->cluster[i]->is_new = 1;
3974 * For volatile autoclusters that are currently in auto mode
3975 * we need to discover if it will be set to manual mode.
3976 * If so, then we have to copy the current volatile values
3977 * first since those will become the new manual values (which
3978 * may be overwritten by explicit new values from this set
3981 if (master->is_auto && master->has_volatiles &&
3982 !is_cur_manual(master)) {
3983 s32 new_auto_val = *master->p_new.p_s32;
3986 * If the new value == the manual value, then copy
3987 * the current volatile values.
3989 if (new_auto_val == master->manual_mode_value)
3990 update_from_auto_cluster(master);
3993 try_or_set_cluster(NULL, master, true, 0);
3995 v4l2_ctrl_unlock(master);
3998 media_request_object_put(obj);
4000 EXPORT_SYMBOL(v4l2_ctrl_request_setup);
4002 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
4006 if (notify == NULL) {
4007 ctrl->call_notify = 0;
4010 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
4012 ctrl->handler->notify = notify;
4013 ctrl->handler->notify_priv = priv;
4014 ctrl->call_notify = 1;
4016 EXPORT_SYMBOL(v4l2_ctrl_notify);
4018 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
4019 s64 min, s64 max, u64 step, s64 def)
4022 bool range_changed = false;
4025 lockdep_assert_held(ctrl->handler->lock);
4027 switch (ctrl->type) {
4028 case V4L2_CTRL_TYPE_INTEGER:
4029 case V4L2_CTRL_TYPE_INTEGER64:
4030 case V4L2_CTRL_TYPE_BOOLEAN:
4031 case V4L2_CTRL_TYPE_MENU:
4032 case V4L2_CTRL_TYPE_INTEGER_MENU:
4033 case V4L2_CTRL_TYPE_BITMASK:
4034 case V4L2_CTRL_TYPE_U8:
4035 case V4L2_CTRL_TYPE_U16:
4036 case V4L2_CTRL_TYPE_U32:
4039 ret = check_range(ctrl->type, min, max, step, def);
4046 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
4047 (ctrl->step != step) || ctrl->default_value != def) {
4048 range_changed = true;
4049 ctrl->minimum = min;
4050 ctrl->maximum = max;
4052 ctrl->default_value = def;
4055 if (validate_new(ctrl, ctrl->p_new)) {
4056 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4057 *ctrl->p_new.p_s64 = def;
4059 *ctrl->p_new.p_s32 = def;
4062 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4063 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
4065 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
4067 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4068 else if (range_changed)
4069 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4072 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
4074 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
4076 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4081 v4l2_ctrl_lock(ctrl);
4082 list_add_tail(&sev->node, &ctrl->ev_subs);
4083 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
4084 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
4085 struct v4l2_event ev;
4086 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
4088 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
4089 changes |= V4L2_EVENT_CTRL_CH_VALUE;
4090 fill_event(&ev, ctrl, changes);
4091 /* Mark the queue as active, allowing this initial
4092 event to be accepted. */
4094 v4l2_event_queue_fh(sev->fh, &ev);
4096 v4l2_ctrl_unlock(ctrl);
4100 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
4102 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4107 v4l2_ctrl_lock(ctrl);
4108 list_del(&sev->node);
4109 v4l2_ctrl_unlock(ctrl);
4112 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
4114 u32 old_changes = old->u.ctrl.changes;
4116 old->u.ctrl = new->u.ctrl;
4117 old->u.ctrl.changes |= old_changes;
4119 EXPORT_SYMBOL(v4l2_ctrl_replace);
4121 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
4123 new->u.ctrl.changes |= old->u.ctrl.changes;
4125 EXPORT_SYMBOL(v4l2_ctrl_merge);
4127 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
4128 .add = v4l2_ctrl_add_event,
4129 .del = v4l2_ctrl_del_event,
4130 .replace = v4l2_ctrl_replace,
4131 .merge = v4l2_ctrl_merge,
4133 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
4135 int v4l2_ctrl_log_status(struct file *file, void *fh)
4137 struct video_device *vfd = video_devdata(file);
4138 struct v4l2_fh *vfh = file->private_data;
4140 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
4141 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
4142 vfd->v4l2_dev->name);
4145 EXPORT_SYMBOL(v4l2_ctrl_log_status);
4147 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
4148 const struct v4l2_event_subscription *sub)
4150 if (sub->type == V4L2_EVENT_CTRL)
4151 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
4154 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
4156 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
4157 struct v4l2_event_subscription *sub)
4159 if (!sd->ctrl_handler)
4161 return v4l2_ctrl_subscribe_event(fh, sub);
4163 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
4165 __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
4167 struct v4l2_fh *fh = file->private_data;
4169 if (v4l2_event_pending(fh))
4171 poll_wait(file, &fh->wait, wait);
4174 EXPORT_SYMBOL(v4l2_ctrl_poll);
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