1 // SPDX-License-Identifier: GPL-2.0-or-later
3 V4L2 controls framework implementation.
5 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
9 #define pr_fmt(fmt) "v4l2-ctrls: " fmt
11 #include <linux/ctype.h>
13 #include <linux/slab.h>
14 #include <linux/export.h>
15 #include <media/v4l2-ioctl.h>
16 #include <media/v4l2-device.h>
17 #include <media/v4l2-ctrls.h>
18 #include <media/v4l2-event.h>
19 #include <media/v4l2-dev.h>
21 #define dprintk(vdev, fmt, arg...) do { \
22 if (!WARN_ON(!(vdev)) && ((vdev)->dev_debug & V4L2_DEV_DEBUG_CTRL)) \
23 printk(KERN_DEBUG pr_fmt("%s: %s: " fmt), \
24 __func__, video_device_node_name(vdev), ##arg); \
27 #define has_op(master, op) \
28 (master->ops && master->ops->op)
29 #define call_op(master, op) \
30 (has_op(master, op) ? master->ops->op(master) : 0)
32 static const union v4l2_ctrl_ptr ptr_null;
34 /* Internal temporary helper struct, one for each v4l2_ext_control */
35 struct v4l2_ctrl_helper {
36 /* Pointer to the control reference of the master control */
37 struct v4l2_ctrl_ref *mref;
38 /* The control ref corresponding to the v4l2_ext_control ID field. */
39 struct v4l2_ctrl_ref *ref;
40 /* v4l2_ext_control index of the next control belonging to the
41 same cluster, or 0 if there isn't any. */
45 /* Small helper function to determine if the autocluster is set to manual
47 static bool is_cur_manual(const struct v4l2_ctrl *master)
49 return master->is_auto && master->cur.val == master->manual_mode_value;
52 /* Same as above, but this checks the against the new value instead of the
54 static bool is_new_manual(const struct v4l2_ctrl *master)
56 return master->is_auto && master->val == master->manual_mode_value;
59 /* Returns NULL or a character pointer array containing the menu for
60 the given control ID. The pointer array ends with a NULL pointer.
61 An empty string signifies a menu entry that is invalid. This allows
62 drivers to disable certain options if it is not supported. */
63 const char * const *v4l2_ctrl_get_menu(u32 id)
65 static const char * const mpeg_audio_sampling_freq[] = {
71 static const char * const mpeg_audio_encoding[] = {
79 static const char * const mpeg_audio_l1_bitrate[] = {
96 static const char * const mpeg_audio_l2_bitrate[] = {
113 static const char * const mpeg_audio_l3_bitrate[] = {
130 static const char * const mpeg_audio_ac3_bitrate[] = {
152 static const char * const mpeg_audio_mode[] = {
159 static const char * const mpeg_audio_mode_extension[] = {
166 static const char * const mpeg_audio_emphasis[] = {
172 static const char * const mpeg_audio_crc[] = {
177 static const char * const mpeg_audio_dec_playback[] = {
186 static const char * const mpeg_video_encoding[] = {
192 static const char * const mpeg_video_aspect[] = {
199 static const char * const mpeg_video_bitrate_mode[] = {
204 static const char * const mpeg_stream_type[] = {
205 "MPEG-2 Program Stream",
206 "MPEG-2 Transport Stream",
207 "MPEG-1 System Stream",
208 "MPEG-2 DVD-compatible Stream",
209 "MPEG-1 VCD-compatible Stream",
210 "MPEG-2 SVCD-compatible Stream",
213 static const char * const mpeg_stream_vbi_fmt[] = {
215 "Private Packet, IVTV Format",
218 static const char * const camera_power_line_frequency[] = {
225 static const char * const camera_exposure_auto[] = {
228 "Shutter Priority Mode",
229 "Aperture Priority Mode",
232 static const char * const camera_exposure_metering[] = {
239 static const char * const camera_auto_focus_range[] = {
246 static const char * const colorfx[] = {
265 static const char * const auto_n_preset_white_balance[] = {
278 static const char * const camera_iso_sensitivity_auto[] = {
283 static const char * const scene_mode[] = {
300 static const char * const tune_emphasis[] = {
306 static const char * const header_mode[] = {
308 "Joined With 1st Frame",
311 static const char * const multi_slice[] = {
317 static const char * const entropy_mode[] = {
322 static const char * const mpeg_h264_level[] = {
341 static const char * const h264_loop_filter[] = {
344 "Disabled at Slice Boundary",
347 static const char * const h264_profile[] = {
349 "Constrained Baseline",
355 "High 444 Predictive",
362 "Scalable High Intra",
367 static const char * const vui_sar_idc[] = {
388 static const char * const h264_fp_arrangement_type[] = {
397 static const char * const h264_fmo_map_type[] = {
398 "Interleaved Slices",
400 "Foreground with Leftover",
407 static const char * const h264_decode_mode[] = {
412 static const char * const h264_start_code[] = {
414 "Annex B Start Code",
417 static const char * const mpeg_mpeg2_level[] = {
424 static const char * const mpeg2_profile[] = {
428 "Spatially Scalable",
432 static const char * const mpeg_mpeg4_level[] = {
443 static const char * const mpeg4_profile[] = {
448 "Advanced Coding Efficiency",
452 static const char * const vpx_golden_frame_sel[] = {
453 "Use Previous Frame",
454 "Use Previous Specific Frame",
457 static const char * const vp8_profile[] = {
464 static const char * const vp9_profile[] = {
472 static const char * const flash_led_mode[] = {
478 static const char * const flash_strobe_source[] = {
484 static const char * const jpeg_chroma_subsampling[] = {
493 static const char * const dv_tx_mode[] = {
498 static const char * const dv_rgb_range[] = {
500 "RGB Limited Range (16-235)",
501 "RGB Full Range (0-255)",
504 static const char * const dv_it_content_type[] = {
512 static const char * const detect_md_mode[] = {
520 static const char * const hevc_profile[] = {
522 "Main Still Picture",
526 static const char * const hevc_level[] = {
542 static const char * const hevc_hierarchial_coding_type[] = {
547 static const char * const hevc_refresh_type[] = {
553 static const char * const hevc_size_of_length_field[] = {
560 static const char * const hevc_tier[] = {
565 static const char * const hevc_loop_filter_mode[] = {
568 "Disabled at slice boundary",
571 static const char * const hevc_decode_mode[] = {
576 static const char * const hevc_start_code[] = {
578 "Annex B Start Code",
583 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
584 return mpeg_audio_sampling_freq;
585 case V4L2_CID_MPEG_AUDIO_ENCODING:
586 return mpeg_audio_encoding;
587 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
588 return mpeg_audio_l1_bitrate;
589 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
590 return mpeg_audio_l2_bitrate;
591 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
592 return mpeg_audio_l3_bitrate;
593 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
594 return mpeg_audio_ac3_bitrate;
595 case V4L2_CID_MPEG_AUDIO_MODE:
596 return mpeg_audio_mode;
597 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
598 return mpeg_audio_mode_extension;
599 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
600 return mpeg_audio_emphasis;
601 case V4L2_CID_MPEG_AUDIO_CRC:
602 return mpeg_audio_crc;
603 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
604 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
605 return mpeg_audio_dec_playback;
606 case V4L2_CID_MPEG_VIDEO_ENCODING:
607 return mpeg_video_encoding;
608 case V4L2_CID_MPEG_VIDEO_ASPECT:
609 return mpeg_video_aspect;
610 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
611 return mpeg_video_bitrate_mode;
612 case V4L2_CID_MPEG_STREAM_TYPE:
613 return mpeg_stream_type;
614 case V4L2_CID_MPEG_STREAM_VBI_FMT:
615 return mpeg_stream_vbi_fmt;
616 case V4L2_CID_POWER_LINE_FREQUENCY:
617 return camera_power_line_frequency;
618 case V4L2_CID_EXPOSURE_AUTO:
619 return camera_exposure_auto;
620 case V4L2_CID_EXPOSURE_METERING:
621 return camera_exposure_metering;
622 case V4L2_CID_AUTO_FOCUS_RANGE:
623 return camera_auto_focus_range;
624 case V4L2_CID_COLORFX:
626 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
627 return auto_n_preset_white_balance;
628 case V4L2_CID_ISO_SENSITIVITY_AUTO:
629 return camera_iso_sensitivity_auto;
630 case V4L2_CID_SCENE_MODE:
632 case V4L2_CID_TUNE_PREEMPHASIS:
633 return tune_emphasis;
634 case V4L2_CID_TUNE_DEEMPHASIS:
635 return tune_emphasis;
636 case V4L2_CID_FLASH_LED_MODE:
637 return flash_led_mode;
638 case V4L2_CID_FLASH_STROBE_SOURCE:
639 return flash_strobe_source;
640 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
642 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
644 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
646 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
647 return mpeg_h264_level;
648 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
649 return h264_loop_filter;
650 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
652 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
654 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
655 return h264_fp_arrangement_type;
656 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
657 return h264_fmo_map_type;
658 case V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE:
659 return h264_decode_mode;
660 case V4L2_CID_MPEG_VIDEO_H264_START_CODE:
661 return h264_start_code;
662 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
663 return mpeg_mpeg2_level;
664 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
665 return mpeg2_profile;
666 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
667 return mpeg_mpeg4_level;
668 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
669 return mpeg4_profile;
670 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
671 return vpx_golden_frame_sel;
672 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
674 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
676 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
677 return jpeg_chroma_subsampling;
678 case V4L2_CID_DV_TX_MODE:
680 case V4L2_CID_DV_TX_RGB_RANGE:
681 case V4L2_CID_DV_RX_RGB_RANGE:
683 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
684 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
685 return dv_it_content_type;
686 case V4L2_CID_DETECT_MD_MODE:
687 return detect_md_mode;
688 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
690 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
692 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
693 return hevc_hierarchial_coding_type;
694 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
695 return hevc_refresh_type;
696 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
697 return hevc_size_of_length_field;
698 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
700 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
701 return hevc_loop_filter_mode;
702 case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE:
703 return hevc_decode_mode;
704 case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE:
705 return hevc_start_code;
710 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
712 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
714 * Returns NULL or an s64 type array containing the menu for given
715 * control ID. The total number of the menu items is returned in @len.
717 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
719 static const s64 qmenu_int_vpx_num_partitions[] = {
723 static const s64 qmenu_int_vpx_num_ref_frames[] = {
728 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
729 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
730 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
731 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
737 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
739 /* Return the control name. */
740 const char *v4l2_ctrl_get_name(u32 id)
744 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
745 case V4L2_CID_USER_CLASS: return "User Controls";
746 case V4L2_CID_BRIGHTNESS: return "Brightness";
747 case V4L2_CID_CONTRAST: return "Contrast";
748 case V4L2_CID_SATURATION: return "Saturation";
749 case V4L2_CID_HUE: return "Hue";
750 case V4L2_CID_AUDIO_VOLUME: return "Volume";
751 case V4L2_CID_AUDIO_BALANCE: return "Balance";
752 case V4L2_CID_AUDIO_BASS: return "Bass";
753 case V4L2_CID_AUDIO_TREBLE: return "Treble";
754 case V4L2_CID_AUDIO_MUTE: return "Mute";
755 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
756 case V4L2_CID_BLACK_LEVEL: return "Black Level";
757 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
758 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
759 case V4L2_CID_RED_BALANCE: return "Red Balance";
760 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
761 case V4L2_CID_GAMMA: return "Gamma";
762 case V4L2_CID_EXPOSURE: return "Exposure";
763 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
764 case V4L2_CID_GAIN: return "Gain";
765 case V4L2_CID_HFLIP: return "Horizontal Flip";
766 case V4L2_CID_VFLIP: return "Vertical Flip";
767 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
768 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
769 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
770 case V4L2_CID_SHARPNESS: return "Sharpness";
771 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
772 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
773 case V4L2_CID_COLOR_KILLER: return "Color Killer";
774 case V4L2_CID_COLORFX: return "Color Effects";
775 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
776 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
777 case V4L2_CID_ROTATE: return "Rotate";
778 case V4L2_CID_BG_COLOR: return "Background Color";
779 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
780 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
781 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
782 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
783 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
784 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
785 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
788 /* The MPEG controls are applicable to all codec controls
789 * and the 'MPEG' part of the define is historical */
790 /* Keep the order of the 'case's the same as in videodev2.h! */
791 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
792 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
793 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
794 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
795 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
796 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
797 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
798 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
799 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
800 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
801 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
802 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
803 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
804 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
805 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
806 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
807 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
808 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
809 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
810 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
811 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
812 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
813 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
814 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
815 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
816 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
817 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
818 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
819 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
820 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
821 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
822 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
823 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
824 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
825 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
826 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
827 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
828 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
829 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
830 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
831 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
832 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
833 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
834 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
835 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
836 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
837 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
838 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
839 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
840 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
841 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
842 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
843 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
844 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
845 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
846 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
847 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
848 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
849 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
850 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
851 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
852 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
853 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
854 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
855 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
856 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
857 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
858 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
859 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
860 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
861 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
862 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
863 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
864 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
865 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
866 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
867 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
868 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
869 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
870 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
871 return "H264 Set QP Value for HC Layers";
872 case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
873 return "H264 Constrained Intra Pred";
874 case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET: return "H264 Chroma QP Index Offset";
875 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP: return "H264 I-Frame Minimum QP Value";
876 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP: return "H264 I-Frame Maximum QP Value";
877 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP: return "H264 P-Frame Minimum QP Value";
878 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP: return "H264 P-Frame Maximum QP Value";
879 case V4L2_CID_MPEG_VIDEO_H264_SPS: return "H264 Sequence Parameter Set";
880 case V4L2_CID_MPEG_VIDEO_H264_PPS: return "H264 Picture Parameter Set";
881 case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX: return "H264 Scaling Matrix";
882 case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS: return "H264 Slice Parameters";
883 case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS: return "H264 Decode Parameters";
884 case V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE: return "H264 Decode Mode";
885 case V4L2_CID_MPEG_VIDEO_H264_START_CODE: return "H264 Start Code";
886 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL: return "MPEG2 Level";
887 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE: return "MPEG2 Profile";
888 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
889 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
890 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
891 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
892 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
893 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
894 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
895 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
896 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
897 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
898 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
899 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
900 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
901 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
902 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
903 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
904 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
905 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
906 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
907 case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS: return "MPEG-2 Slice Parameters";
908 case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION: return "MPEG-2 Quantization Matrices";
909 case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS: return "FWHT Stateless Parameters";
910 case V4L2_CID_FWHT_I_FRAME_QP: return "FWHT I-Frame QP Value";
911 case V4L2_CID_FWHT_P_FRAME_QP: return "FWHT P-Frame QP Value";
914 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
915 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
916 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
917 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
918 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
919 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
920 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
921 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
922 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
923 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
924 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
925 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE: return "VP8 Profile";
926 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE: return "VP9 Profile";
927 case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER: return "VP8 Frame Header";
930 case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP: return "HEVC I-Frame QP Value";
931 case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP: return "HEVC P-Frame QP Value";
932 case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP: return "HEVC B-Frame QP Value";
933 case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP: return "HEVC Minimum QP Value";
934 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP: return "HEVC Maximum QP Value";
935 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE: return "HEVC Profile";
936 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL: return "HEVC Level";
937 case V4L2_CID_MPEG_VIDEO_HEVC_TIER: return "HEVC Tier";
938 case V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION: return "HEVC Frame Rate Resolution";
939 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH: return "HEVC Maximum Coding Unit Depth";
940 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE: return "HEVC Refresh Type";
941 case V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED: return "HEVC Constant Intra Prediction";
942 case V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU: return "HEVC Lossless Encoding";
943 case V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT: return "HEVC Wavefront";
944 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE: return "HEVC Loop Filter";
945 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP: return "HEVC QP Values";
946 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE: return "HEVC Hierarchical Coding Type";
947 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER: return "HEVC Hierarchical Coding Layer";
948 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP: return "HEVC Hierarchical Layer 0 QP";
949 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP: return "HEVC Hierarchical Layer 1 QP";
950 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP: return "HEVC Hierarchical Layer 2 QP";
951 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP: return "HEVC Hierarchical Layer 3 QP";
952 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP: return "HEVC Hierarchical Layer 4 QP";
953 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP: return "HEVC Hierarchical Layer 5 QP";
954 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP: return "HEVC Hierarchical Layer 6 QP";
955 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR: return "HEVC Hierarchical Lay 0 BitRate";
956 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR: return "HEVC Hierarchical Lay 1 BitRate";
957 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR: return "HEVC Hierarchical Lay 2 BitRate";
958 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR: return "HEVC Hierarchical Lay 3 BitRate";
959 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR: return "HEVC Hierarchical Lay 4 BitRate";
960 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR: return "HEVC Hierarchical Lay 5 BitRate";
961 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR: return "HEVC Hierarchical Lay 6 BitRate";
962 case V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB: return "HEVC General PB";
963 case V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID: return "HEVC Temporal ID";
964 case V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING: return "HEVC Strong Intra Smoothing";
965 case V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT: return "HEVC Intra PU Split";
966 case V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION: return "HEVC TMV Prediction";
967 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1: return "HEVC Max Num of Candidate MVs";
968 case V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE: return "HEVC ENC Without Startcode";
969 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD: return "HEVC Num of I-Frame b/w 2 IDR";
970 case V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2: return "HEVC Loop Filter Beta Offset";
971 case V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2: return "HEVC Loop Filter TC Offset";
972 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD: return "HEVC Size of Length Field";
973 case V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES: return "Reference Frames for a P-Frame";
974 case V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR: return "Prepend SPS and PPS to IDR";
975 case V4L2_CID_MPEG_VIDEO_HEVC_SPS: return "HEVC Sequence Parameter Set";
976 case V4L2_CID_MPEG_VIDEO_HEVC_PPS: return "HEVC Picture Parameter Set";
977 case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS: return "HEVC Slice Parameters";
978 case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE: return "HEVC Decode Mode";
979 case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE: return "HEVC Start Code";
981 /* CAMERA controls */
982 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
983 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
984 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
985 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
986 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
987 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
988 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
989 case V4L2_CID_PAN_RESET: return "Pan, Reset";
990 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
991 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
992 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
993 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
994 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
995 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
996 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
997 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
998 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
999 case V4L2_CID_PRIVACY: return "Privacy";
1000 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
1001 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
1002 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
1003 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
1004 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
1005 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
1006 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
1007 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
1008 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
1009 case V4L2_CID_SCENE_MODE: return "Scene Mode";
1010 case V4L2_CID_3A_LOCK: return "3A Lock";
1011 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
1012 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
1013 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
1014 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
1015 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
1016 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
1017 case V4L2_CID_UNIT_CELL_SIZE: return "Unit Cell Size";
1019 /* FM Radio Modulator controls */
1020 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1021 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
1022 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
1023 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
1024 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
1025 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
1026 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
1027 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
1028 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
1029 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
1030 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
1031 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1032 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
1033 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
1034 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
1035 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
1036 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
1037 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
1038 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
1039 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
1040 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
1041 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
1042 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
1043 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
1044 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
1045 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
1046 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
1047 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
1048 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
1049 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
1051 /* Flash controls */
1052 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1053 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
1054 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
1055 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
1056 case V4L2_CID_FLASH_STROBE: return "Strobe";
1057 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
1058 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
1059 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
1060 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
1061 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
1062 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
1063 case V4L2_CID_FLASH_FAULT: return "Faults";
1064 case V4L2_CID_FLASH_CHARGE: return "Charge";
1065 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
1067 /* JPEG encoder controls */
1068 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1069 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
1070 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
1071 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
1072 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
1073 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
1075 /* Image source controls */
1076 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1077 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
1078 case V4L2_CID_VBLANK: return "Vertical Blanking";
1079 case V4L2_CID_HBLANK: return "Horizontal Blanking";
1080 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
1081 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
1082 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
1083 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
1084 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
1086 /* Image processing controls */
1087 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1088 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
1089 case V4L2_CID_LINK_FREQ: return "Link Frequency";
1090 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
1091 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
1092 case V4L2_CID_DEINTERLACING_MODE: return "Deinterlacing Mode";
1093 case V4L2_CID_DIGITAL_GAIN: return "Digital Gain";
1096 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1097 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
1098 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
1099 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
1100 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
1101 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
1102 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
1103 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
1104 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
1105 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
1106 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
1108 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
1109 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
1110 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
1111 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
1112 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
1113 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
1114 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
1115 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
1116 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
1117 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
1118 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
1119 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
1120 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
1121 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
1122 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
1123 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
1124 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
1125 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1126 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
1127 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
1129 /* Detection controls */
1130 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1131 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
1132 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
1133 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
1134 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
1135 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
1140 EXPORT_SYMBOL(v4l2_ctrl_get_name);
1142 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
1143 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
1145 *name = v4l2_ctrl_get_name(id);
1149 case V4L2_CID_AUDIO_MUTE:
1150 case V4L2_CID_AUDIO_LOUDNESS:
1151 case V4L2_CID_AUTO_WHITE_BALANCE:
1152 case V4L2_CID_AUTOGAIN:
1153 case V4L2_CID_HFLIP:
1154 case V4L2_CID_VFLIP:
1155 case V4L2_CID_HUE_AUTO:
1156 case V4L2_CID_CHROMA_AGC:
1157 case V4L2_CID_COLOR_KILLER:
1158 case V4L2_CID_AUTOBRIGHTNESS:
1159 case V4L2_CID_MPEG_AUDIO_MUTE:
1160 case V4L2_CID_MPEG_VIDEO_MUTE:
1161 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
1162 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
1163 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
1164 case V4L2_CID_FOCUS_AUTO:
1165 case V4L2_CID_PRIVACY:
1166 case V4L2_CID_AUDIO_LIMITER_ENABLED:
1167 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
1168 case V4L2_CID_PILOT_TONE_ENABLED:
1169 case V4L2_CID_ILLUMINATORS_1:
1170 case V4L2_CID_ILLUMINATORS_2:
1171 case V4L2_CID_FLASH_STROBE_STATUS:
1172 case V4L2_CID_FLASH_CHARGE:
1173 case V4L2_CID_FLASH_READY:
1174 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
1175 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
1176 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
1177 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
1178 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
1179 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
1180 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
1181 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
1182 case V4L2_CID_WIDE_DYNAMIC_RANGE:
1183 case V4L2_CID_IMAGE_STABILIZATION:
1184 case V4L2_CID_RDS_RECEPTION:
1185 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
1186 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
1187 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
1188 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
1189 case V4L2_CID_RF_TUNER_PLL_LOCK:
1190 case V4L2_CID_RDS_TX_MONO_STEREO:
1191 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
1192 case V4L2_CID_RDS_TX_COMPRESSED:
1193 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
1194 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
1195 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
1196 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
1197 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
1198 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1199 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1200 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1201 *type = V4L2_CTRL_TYPE_BOOLEAN;
1205 case V4L2_CID_ROTATE:
1206 *type = V4L2_CTRL_TYPE_INTEGER;
1207 *flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
1209 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1210 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1211 *type = V4L2_CTRL_TYPE_INTEGER;
1213 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1214 case V4L2_CID_PAN_RESET:
1215 case V4L2_CID_TILT_RESET:
1216 case V4L2_CID_FLASH_STROBE:
1217 case V4L2_CID_FLASH_STROBE_STOP:
1218 case V4L2_CID_AUTO_FOCUS_START:
1219 case V4L2_CID_AUTO_FOCUS_STOP:
1220 case V4L2_CID_DO_WHITE_BALANCE:
1221 *type = V4L2_CTRL_TYPE_BUTTON;
1222 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1223 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1224 *min = *max = *step = *def = 0;
1226 case V4L2_CID_POWER_LINE_FREQUENCY:
1227 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1228 case V4L2_CID_MPEG_AUDIO_ENCODING:
1229 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1230 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1231 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1232 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1233 case V4L2_CID_MPEG_AUDIO_MODE:
1234 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1235 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1236 case V4L2_CID_MPEG_AUDIO_CRC:
1237 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1238 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1239 case V4L2_CID_MPEG_VIDEO_ENCODING:
1240 case V4L2_CID_MPEG_VIDEO_ASPECT:
1241 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1242 case V4L2_CID_MPEG_STREAM_TYPE:
1243 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1244 case V4L2_CID_EXPOSURE_AUTO:
1245 case V4L2_CID_AUTO_FOCUS_RANGE:
1246 case V4L2_CID_COLORFX:
1247 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1248 case V4L2_CID_TUNE_PREEMPHASIS:
1249 case V4L2_CID_FLASH_LED_MODE:
1250 case V4L2_CID_FLASH_STROBE_SOURCE:
1251 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1252 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1253 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1254 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1255 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1256 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1257 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1258 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1259 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1260 case V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE:
1261 case V4L2_CID_MPEG_VIDEO_H264_START_CODE:
1262 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
1263 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
1264 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1265 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1266 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1267 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1268 case V4L2_CID_EXPOSURE_METERING:
1269 case V4L2_CID_SCENE_MODE:
1270 case V4L2_CID_DV_TX_MODE:
1271 case V4L2_CID_DV_TX_RGB_RANGE:
1272 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1273 case V4L2_CID_DV_RX_RGB_RANGE:
1274 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1275 case V4L2_CID_TEST_PATTERN:
1276 case V4L2_CID_DEINTERLACING_MODE:
1277 case V4L2_CID_TUNE_DEEMPHASIS:
1278 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1279 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
1280 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
1281 case V4L2_CID_DETECT_MD_MODE:
1282 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
1283 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
1284 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
1285 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
1286 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
1287 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
1288 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
1289 case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE:
1290 case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE:
1291 *type = V4L2_CTRL_TYPE_MENU;
1293 case V4L2_CID_LINK_FREQ:
1294 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1296 case V4L2_CID_RDS_TX_PS_NAME:
1297 case V4L2_CID_RDS_TX_RADIO_TEXT:
1298 case V4L2_CID_RDS_RX_PS_NAME:
1299 case V4L2_CID_RDS_RX_RADIO_TEXT:
1300 *type = V4L2_CTRL_TYPE_STRING;
1302 case V4L2_CID_ISO_SENSITIVITY:
1303 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1304 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1305 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1306 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1308 case V4L2_CID_USER_CLASS:
1309 case V4L2_CID_CAMERA_CLASS:
1310 case V4L2_CID_MPEG_CLASS:
1311 case V4L2_CID_FM_TX_CLASS:
1312 case V4L2_CID_FLASH_CLASS:
1313 case V4L2_CID_JPEG_CLASS:
1314 case V4L2_CID_IMAGE_SOURCE_CLASS:
1315 case V4L2_CID_IMAGE_PROC_CLASS:
1316 case V4L2_CID_DV_CLASS:
1317 case V4L2_CID_FM_RX_CLASS:
1318 case V4L2_CID_RF_TUNER_CLASS:
1319 case V4L2_CID_DETECT_CLASS:
1320 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1321 /* You can neither read not write these */
1322 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1323 *min = *max = *step = *def = 0;
1325 case V4L2_CID_BG_COLOR:
1326 *type = V4L2_CTRL_TYPE_INTEGER;
1329 /* Max is calculated as RGB888 that is 2^24 */
1332 case V4L2_CID_FLASH_FAULT:
1333 case V4L2_CID_JPEG_ACTIVE_MARKER:
1334 case V4L2_CID_3A_LOCK:
1335 case V4L2_CID_AUTO_FOCUS_STATUS:
1336 case V4L2_CID_DV_TX_HOTPLUG:
1337 case V4L2_CID_DV_TX_RXSENSE:
1338 case V4L2_CID_DV_TX_EDID_PRESENT:
1339 case V4L2_CID_DV_RX_POWER_PRESENT:
1340 *type = V4L2_CTRL_TYPE_BITMASK;
1342 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1343 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1344 *type = V4L2_CTRL_TYPE_INTEGER;
1345 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1347 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1348 *type = V4L2_CTRL_TYPE_INTEGER64;
1349 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1351 *max = 0x1ffffffffLL;
1354 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1355 *type = V4L2_CTRL_TYPE_INTEGER64;
1356 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1358 *max = 0x7fffffffffffffffLL;
1361 case V4L2_CID_PIXEL_RATE:
1362 *type = V4L2_CTRL_TYPE_INTEGER64;
1363 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1365 case V4L2_CID_DETECT_MD_REGION_GRID:
1366 *type = V4L2_CTRL_TYPE_U8;
1368 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1369 *type = V4L2_CTRL_TYPE_U16;
1371 case V4L2_CID_RDS_TX_ALT_FREQS:
1372 *type = V4L2_CTRL_TYPE_U32;
1374 case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:
1375 *type = V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS;
1377 case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:
1378 *type = V4L2_CTRL_TYPE_MPEG2_QUANTIZATION;
1380 case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS:
1381 *type = V4L2_CTRL_TYPE_FWHT_PARAMS;
1383 case V4L2_CID_MPEG_VIDEO_H264_SPS:
1384 *type = V4L2_CTRL_TYPE_H264_SPS;
1386 case V4L2_CID_MPEG_VIDEO_H264_PPS:
1387 *type = V4L2_CTRL_TYPE_H264_PPS;
1389 case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX:
1390 *type = V4L2_CTRL_TYPE_H264_SCALING_MATRIX;
1392 case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS:
1393 *type = V4L2_CTRL_TYPE_H264_SLICE_PARAMS;
1395 case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS:
1396 *type = V4L2_CTRL_TYPE_H264_DECODE_PARAMS;
1398 case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER:
1399 *type = V4L2_CTRL_TYPE_VP8_FRAME_HEADER;
1401 case V4L2_CID_MPEG_VIDEO_HEVC_SPS:
1402 *type = V4L2_CTRL_TYPE_HEVC_SPS;
1404 case V4L2_CID_MPEG_VIDEO_HEVC_PPS:
1405 *type = V4L2_CTRL_TYPE_HEVC_PPS;
1407 case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:
1408 *type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
1410 case V4L2_CID_UNIT_CELL_SIZE:
1411 *type = V4L2_CTRL_TYPE_AREA;
1412 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1415 *type = V4L2_CTRL_TYPE_INTEGER;
1419 case V4L2_CID_MPEG_AUDIO_ENCODING:
1420 case V4L2_CID_MPEG_AUDIO_MODE:
1421 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1422 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1423 case V4L2_CID_MPEG_STREAM_TYPE:
1424 *flags |= V4L2_CTRL_FLAG_UPDATE;
1426 case V4L2_CID_AUDIO_VOLUME:
1427 case V4L2_CID_AUDIO_BALANCE:
1428 case V4L2_CID_AUDIO_BASS:
1429 case V4L2_CID_AUDIO_TREBLE:
1430 case V4L2_CID_BRIGHTNESS:
1431 case V4L2_CID_CONTRAST:
1432 case V4L2_CID_SATURATION:
1434 case V4L2_CID_RED_BALANCE:
1435 case V4L2_CID_BLUE_BALANCE:
1436 case V4L2_CID_GAMMA:
1437 case V4L2_CID_SHARPNESS:
1438 case V4L2_CID_CHROMA_GAIN:
1439 case V4L2_CID_RDS_TX_DEVIATION:
1440 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1441 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1442 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1443 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1444 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1445 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1446 case V4L2_CID_PILOT_TONE_DEVIATION:
1447 case V4L2_CID_PILOT_TONE_FREQUENCY:
1448 case V4L2_CID_TUNE_POWER_LEVEL:
1449 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1450 case V4L2_CID_RF_TUNER_RF_GAIN:
1451 case V4L2_CID_RF_TUNER_LNA_GAIN:
1452 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1453 case V4L2_CID_RF_TUNER_IF_GAIN:
1454 case V4L2_CID_RF_TUNER_BANDWIDTH:
1455 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1456 *flags |= V4L2_CTRL_FLAG_SLIDER;
1458 case V4L2_CID_PAN_RELATIVE:
1459 case V4L2_CID_TILT_RELATIVE:
1460 case V4L2_CID_FOCUS_RELATIVE:
1461 case V4L2_CID_IRIS_RELATIVE:
1462 case V4L2_CID_ZOOM_RELATIVE:
1463 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1464 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1466 case V4L2_CID_FLASH_STROBE_STATUS:
1467 case V4L2_CID_AUTO_FOCUS_STATUS:
1468 case V4L2_CID_FLASH_READY:
1469 case V4L2_CID_DV_TX_HOTPLUG:
1470 case V4L2_CID_DV_TX_RXSENSE:
1471 case V4L2_CID_DV_TX_EDID_PRESENT:
1472 case V4L2_CID_DV_RX_POWER_PRESENT:
1473 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1474 case V4L2_CID_RDS_RX_PTY:
1475 case V4L2_CID_RDS_RX_PS_NAME:
1476 case V4L2_CID_RDS_RX_RADIO_TEXT:
1477 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1478 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1479 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1480 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1482 case V4L2_CID_RF_TUNER_PLL_LOCK:
1483 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1487 EXPORT_SYMBOL(v4l2_ctrl_fill);
1489 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1491 u32 flags = ctrl->flags;
1494 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1499 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1501 memset(ev, 0, sizeof(*ev));
1502 ev->type = V4L2_EVENT_CTRL;
1504 ev->u.ctrl.changes = changes;
1505 ev->u.ctrl.type = ctrl->type;
1506 ev->u.ctrl.flags = user_flags(ctrl);
1508 ev->u.ctrl.value64 = 0;
1510 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1511 ev->u.ctrl.minimum = ctrl->minimum;
1512 ev->u.ctrl.maximum = ctrl->maximum;
1513 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1514 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1515 ev->u.ctrl.step = 1;
1517 ev->u.ctrl.step = ctrl->step;
1518 ev->u.ctrl.default_value = ctrl->default_value;
1521 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1523 struct v4l2_event ev;
1524 struct v4l2_subscribed_event *sev;
1526 if (list_empty(&ctrl->ev_subs))
1528 fill_event(&ev, ctrl, changes);
1530 list_for_each_entry(sev, &ctrl->ev_subs, node)
1531 if (sev->fh != fh ||
1532 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1533 v4l2_event_queue_fh(sev->fh, &ev);
1536 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1537 union v4l2_ctrl_ptr ptr1,
1538 union v4l2_ctrl_ptr ptr2)
1540 switch (ctrl->type) {
1541 case V4L2_CTRL_TYPE_BUTTON:
1543 case V4L2_CTRL_TYPE_STRING:
1544 idx *= ctrl->elem_size;
1545 /* strings are always 0-terminated */
1546 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1547 case V4L2_CTRL_TYPE_INTEGER64:
1548 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1549 case V4L2_CTRL_TYPE_U8:
1550 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1551 case V4L2_CTRL_TYPE_U16:
1552 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1553 case V4L2_CTRL_TYPE_U32:
1554 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1557 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1558 idx *= ctrl->elem_size;
1559 return !memcmp(ptr1.p_const + idx, ptr2.p_const + idx,
1564 static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx,
1565 union v4l2_ctrl_ptr ptr)
1567 struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1568 void *p = ptr.p + idx * ctrl->elem_size;
1570 if (ctrl->p_def.p_const)
1571 memcpy(p, ctrl->p_def.p_const, ctrl->elem_size);
1573 memset(p, 0, ctrl->elem_size);
1576 * The cast is needed to get rid of a gcc warning complaining that
1577 * V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS is not part of the
1578 * v4l2_ctrl_type enum.
1580 switch ((u32)ctrl->type) {
1581 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1582 p_mpeg2_slice_params = p;
1584 p_mpeg2_slice_params->sequence.chroma_format = 1;
1585 /* interlaced top field */
1586 p_mpeg2_slice_params->picture.picture_structure = 1;
1587 p_mpeg2_slice_params->picture.picture_coding_type =
1588 V4L2_MPEG2_PICTURE_CODING_TYPE_I;
1593 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1594 union v4l2_ctrl_ptr ptr)
1596 switch (ctrl->type) {
1597 case V4L2_CTRL_TYPE_STRING:
1598 idx *= ctrl->elem_size;
1599 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1600 ptr.p_char[idx + ctrl->minimum] = '\0';
1602 case V4L2_CTRL_TYPE_INTEGER64:
1603 ptr.p_s64[idx] = ctrl->default_value;
1605 case V4L2_CTRL_TYPE_INTEGER:
1606 case V4L2_CTRL_TYPE_INTEGER_MENU:
1607 case V4L2_CTRL_TYPE_MENU:
1608 case V4L2_CTRL_TYPE_BITMASK:
1609 case V4L2_CTRL_TYPE_BOOLEAN:
1610 ptr.p_s32[idx] = ctrl->default_value;
1612 case V4L2_CTRL_TYPE_BUTTON:
1613 case V4L2_CTRL_TYPE_CTRL_CLASS:
1616 case V4L2_CTRL_TYPE_U8:
1617 ptr.p_u8[idx] = ctrl->default_value;
1619 case V4L2_CTRL_TYPE_U16:
1620 ptr.p_u16[idx] = ctrl->default_value;
1622 case V4L2_CTRL_TYPE_U32:
1623 ptr.p_u32[idx] = ctrl->default_value;
1626 std_init_compound(ctrl, idx, ptr);
1631 static void std_log(const struct v4l2_ctrl *ctrl)
1633 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1635 if (ctrl->is_array) {
1638 for (i = 0; i < ctrl->nr_of_dims; i++)
1639 pr_cont("[%u]", ctrl->dims[i]);
1643 switch (ctrl->type) {
1644 case V4L2_CTRL_TYPE_INTEGER:
1645 pr_cont("%d", *ptr.p_s32);
1647 case V4L2_CTRL_TYPE_BOOLEAN:
1648 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1650 case V4L2_CTRL_TYPE_MENU:
1651 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1653 case V4L2_CTRL_TYPE_INTEGER_MENU:
1654 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1656 case V4L2_CTRL_TYPE_BITMASK:
1657 pr_cont("0x%08x", *ptr.p_s32);
1659 case V4L2_CTRL_TYPE_INTEGER64:
1660 pr_cont("%lld", *ptr.p_s64);
1662 case V4L2_CTRL_TYPE_STRING:
1663 pr_cont("%s", ptr.p_char);
1665 case V4L2_CTRL_TYPE_U8:
1666 pr_cont("%u", (unsigned)*ptr.p_u8);
1668 case V4L2_CTRL_TYPE_U16:
1669 pr_cont("%u", (unsigned)*ptr.p_u16);
1671 case V4L2_CTRL_TYPE_U32:
1672 pr_cont("%u", (unsigned)*ptr.p_u32);
1675 pr_cont("unknown type %d", ctrl->type);
1681 * Round towards the closest legal value. Be careful when we are
1682 * close to the maximum range of the control type to prevent
1685 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1687 offset_type offset; \
1688 if ((ctrl)->maximum >= 0 && \
1689 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1690 val = (ctrl)->maximum; \
1692 val += (s32)((ctrl)->step / 2); \
1693 val = clamp_t(typeof(val), val, \
1694 (ctrl)->minimum, (ctrl)->maximum); \
1695 offset = (val) - (ctrl)->minimum; \
1696 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1697 val = (ctrl)->minimum + offset; \
1701 /* Validate a new control */
1703 #define zero_padding(s) \
1704 memset(&(s).padding, 0, sizeof((s).padding))
1707 * Compound controls validation requires setting unused fields/flags to zero
1708 * in order to properly detect unchanged controls with std_equal's memcmp.
1710 static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
1711 union v4l2_ctrl_ptr ptr)
1713 struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1714 struct v4l2_ctrl_vp8_frame_header *p_vp8_frame_header;
1715 struct v4l2_ctrl_hevc_sps *p_hevc_sps;
1716 struct v4l2_ctrl_hevc_pps *p_hevc_pps;
1717 struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
1718 struct v4l2_area *area;
1719 void *p = ptr.p + idx * ctrl->elem_size;
1722 switch ((u32)ctrl->type) {
1723 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1724 p_mpeg2_slice_params = p;
1726 switch (p_mpeg2_slice_params->sequence.chroma_format) {
1735 switch (p_mpeg2_slice_params->picture.intra_dc_precision) {
1736 case 0: /* 8 bits */
1737 case 1: /* 9 bits */
1738 case 2: /* 10 bits */
1739 case 3: /* 11 bits */
1745 switch (p_mpeg2_slice_params->picture.picture_structure) {
1746 case 1: /* interlaced top field */
1747 case 2: /* interlaced bottom field */
1748 case 3: /* progressive */
1754 switch (p_mpeg2_slice_params->picture.picture_coding_type) {
1755 case V4L2_MPEG2_PICTURE_CODING_TYPE_I:
1756 case V4L2_MPEG2_PICTURE_CODING_TYPE_P:
1757 case V4L2_MPEG2_PICTURE_CODING_TYPE_B:
1765 case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
1768 case V4L2_CTRL_TYPE_FWHT_PARAMS:
1771 case V4L2_CTRL_TYPE_H264_SPS:
1772 case V4L2_CTRL_TYPE_H264_PPS:
1773 case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
1774 case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
1775 case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
1778 case V4L2_CTRL_TYPE_VP8_FRAME_HEADER:
1779 p_vp8_frame_header = p;
1781 switch (p_vp8_frame_header->num_dct_parts) {
1790 zero_padding(p_vp8_frame_header->segment_header);
1791 zero_padding(p_vp8_frame_header->lf_header);
1792 zero_padding(p_vp8_frame_header->quant_header);
1793 zero_padding(p_vp8_frame_header->entropy_header);
1794 zero_padding(p_vp8_frame_header->coder_state);
1797 case V4L2_CTRL_TYPE_HEVC_SPS:
1800 if (!(p_hevc_sps->flags & V4L2_HEVC_SPS_FLAG_PCM_ENABLED)) {
1801 p_hevc_sps->pcm_sample_bit_depth_luma_minus1 = 0;
1802 p_hevc_sps->pcm_sample_bit_depth_chroma_minus1 = 0;
1803 p_hevc_sps->log2_min_pcm_luma_coding_block_size_minus3 = 0;
1804 p_hevc_sps->log2_diff_max_min_pcm_luma_coding_block_size = 0;
1807 if (!(p_hevc_sps->flags &
1808 V4L2_HEVC_SPS_FLAG_LONG_TERM_REF_PICS_PRESENT))
1809 p_hevc_sps->num_long_term_ref_pics_sps = 0;
1812 case V4L2_CTRL_TYPE_HEVC_PPS:
1815 if (!(p_hevc_pps->flags &
1816 V4L2_HEVC_PPS_FLAG_CU_QP_DELTA_ENABLED))
1817 p_hevc_pps->diff_cu_qp_delta_depth = 0;
1819 if (!(p_hevc_pps->flags & V4L2_HEVC_PPS_FLAG_TILES_ENABLED)) {
1820 p_hevc_pps->num_tile_columns_minus1 = 0;
1821 p_hevc_pps->num_tile_rows_minus1 = 0;
1822 memset(&p_hevc_pps->column_width_minus1, 0,
1823 sizeof(p_hevc_pps->column_width_minus1));
1824 memset(&p_hevc_pps->row_height_minus1, 0,
1825 sizeof(p_hevc_pps->row_height_minus1));
1827 p_hevc_pps->flags &=
1828 ~V4L2_HEVC_PPS_FLAG_PPS_LOOP_FILTER_ACROSS_SLICES_ENABLED;
1831 if (p_hevc_pps->flags &
1832 V4L2_HEVC_PPS_FLAG_PPS_DISABLE_DEBLOCKING_FILTER) {
1833 p_hevc_pps->pps_beta_offset_div2 = 0;
1834 p_hevc_pps->pps_tc_offset_div2 = 0;
1837 zero_padding(*p_hevc_pps);
1840 case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
1841 p_hevc_slice_params = p;
1843 if (p_hevc_slice_params->num_active_dpb_entries >
1844 V4L2_HEVC_DPB_ENTRIES_NUM_MAX)
1847 zero_padding(p_hevc_slice_params->pred_weight_table);
1849 for (i = 0; i < p_hevc_slice_params->num_active_dpb_entries;
1851 struct v4l2_hevc_dpb_entry *dpb_entry =
1852 &p_hevc_slice_params->dpb[i];
1854 zero_padding(*dpb_entry);
1857 zero_padding(*p_hevc_slice_params);
1860 case V4L2_CTRL_TYPE_AREA:
1862 if (!area->width || !area->height)
1873 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1874 union v4l2_ctrl_ptr ptr)
1880 switch ((u32)ctrl->type) {
1881 case V4L2_CTRL_TYPE_INTEGER:
1882 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1883 case V4L2_CTRL_TYPE_INTEGER64:
1885 * We can't use the ROUND_TO_RANGE define here due to
1886 * the u64 divide that needs special care.
1888 val = ptr.p_s64[idx];
1889 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1890 val = ctrl->maximum;
1892 val += (s64)(ctrl->step / 2);
1893 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1894 offset = val - ctrl->minimum;
1895 do_div(offset, ctrl->step);
1896 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1898 case V4L2_CTRL_TYPE_U8:
1899 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1900 case V4L2_CTRL_TYPE_U16:
1901 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1902 case V4L2_CTRL_TYPE_U32:
1903 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1905 case V4L2_CTRL_TYPE_BOOLEAN:
1906 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1909 case V4L2_CTRL_TYPE_MENU:
1910 case V4L2_CTRL_TYPE_INTEGER_MENU:
1911 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1913 if (ctrl->menu_skip_mask & (1ULL << ptr.p_s32[idx]))
1915 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1916 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1920 case V4L2_CTRL_TYPE_BITMASK:
1921 ptr.p_s32[idx] &= ctrl->maximum;
1924 case V4L2_CTRL_TYPE_BUTTON:
1925 case V4L2_CTRL_TYPE_CTRL_CLASS:
1929 case V4L2_CTRL_TYPE_STRING:
1930 idx *= ctrl->elem_size;
1931 len = strlen(ptr.p_char + idx);
1932 if (len < ctrl->minimum)
1934 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1939 return std_validate_compound(ctrl, idx, ptr);
1943 static const struct v4l2_ctrl_type_ops std_type_ops = {
1947 .validate = std_validate,
1950 /* Helper function: copy the given control value back to the caller */
1951 static int ptr_to_user(struct v4l2_ext_control *c,
1952 struct v4l2_ctrl *ctrl,
1953 union v4l2_ctrl_ptr ptr)
1957 if (ctrl->is_ptr && !ctrl->is_string)
1958 return copy_to_user(c->ptr, ptr.p_const, c->size) ?
1961 switch (ctrl->type) {
1962 case V4L2_CTRL_TYPE_STRING:
1963 len = strlen(ptr.p_char);
1964 if (c->size < len + 1) {
1965 c->size = ctrl->elem_size;
1968 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1970 case V4L2_CTRL_TYPE_INTEGER64:
1971 c->value64 = *ptr.p_s64;
1974 c->value = *ptr.p_s32;
1980 /* Helper function: copy the current control value back to the caller */
1981 static int cur_to_user(struct v4l2_ext_control *c,
1982 struct v4l2_ctrl *ctrl)
1984 return ptr_to_user(c, ctrl, ctrl->p_cur);
1987 /* Helper function: copy the new control value back to the caller */
1988 static int new_to_user(struct v4l2_ext_control *c,
1989 struct v4l2_ctrl *ctrl)
1991 return ptr_to_user(c, ctrl, ctrl->p_new);
1994 /* Helper function: copy the request value back to the caller */
1995 static int req_to_user(struct v4l2_ext_control *c,
1996 struct v4l2_ctrl_ref *ref)
1998 return ptr_to_user(c, ref->ctrl, ref->p_req);
2001 /* Helper function: copy the initial control value back to the caller */
2002 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
2006 for (idx = 0; idx < ctrl->elems; idx++)
2007 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2009 return ptr_to_user(c, ctrl, ctrl->p_new);
2012 /* Helper function: copy the caller-provider value to the given control value */
2013 static int user_to_ptr(struct v4l2_ext_control *c,
2014 struct v4l2_ctrl *ctrl,
2015 union v4l2_ctrl_ptr ptr)
2021 if (ctrl->is_ptr && !ctrl->is_string) {
2024 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
2025 if (ret || !ctrl->is_array)
2027 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
2028 ctrl->type_ops->init(ctrl, idx, ptr);
2032 switch (ctrl->type) {
2033 case V4L2_CTRL_TYPE_INTEGER64:
2034 *ptr.p_s64 = c->value64;
2036 case V4L2_CTRL_TYPE_STRING:
2040 if (size > ctrl->maximum + 1)
2041 size = ctrl->maximum + 1;
2042 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
2044 char last = ptr.p_char[size - 1];
2046 ptr.p_char[size - 1] = 0;
2047 /* If the string was longer than ctrl->maximum,
2048 then return an error. */
2049 if (strlen(ptr.p_char) == ctrl->maximum && last)
2054 *ptr.p_s32 = c->value;
2060 /* Helper function: copy the caller-provider value as the new control value */
2061 static int user_to_new(struct v4l2_ext_control *c,
2062 struct v4l2_ctrl *ctrl)
2064 return user_to_ptr(c, ctrl, ctrl->p_new);
2067 /* Copy the one value to another. */
2068 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
2069 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
2073 memcpy(to.p, from.p_const, ctrl->elems * ctrl->elem_size);
2076 /* Copy the new value to the current value. */
2077 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
2084 /* has_changed is set by cluster_changed */
2085 changed = ctrl->has_changed;
2087 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
2089 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
2090 /* Note: CH_FLAGS is only set for auto clusters. */
2092 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
2093 if (!is_cur_manual(ctrl->cluster[0])) {
2094 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
2095 if (ctrl->cluster[0]->has_volatiles)
2096 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
2100 if (changed || ch_flags) {
2101 /* If a control was changed that was not one of the controls
2102 modified by the application, then send the event to all. */
2105 send_event(fh, ctrl,
2106 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
2107 if (ctrl->call_notify && changed && ctrl->handler->notify)
2108 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
2112 /* Copy the current value to the new value */
2113 static void cur_to_new(struct v4l2_ctrl *ctrl)
2117 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
2120 /* Copy the new value to the request value */
2121 static void new_to_req(struct v4l2_ctrl_ref *ref)
2125 ptr_to_ptr(ref->ctrl, ref->ctrl->p_new, ref->p_req);
2129 /* Copy the request value to the new value */
2130 static void req_to_new(struct v4l2_ctrl_ref *ref)
2135 ptr_to_ptr(ref->ctrl, ref->req->p_req, ref->ctrl->p_new);
2137 ptr_to_ptr(ref->ctrl, ref->ctrl->p_cur, ref->ctrl->p_new);
2140 /* Return non-zero if one or more of the controls in the cluster has a new
2141 value that differs from the current value. */
2142 static int cluster_changed(struct v4l2_ctrl *master)
2144 bool changed = false;
2148 for (i = 0; i < master->ncontrols; i++) {
2149 struct v4l2_ctrl *ctrl = master->cluster[i];
2150 bool ctrl_changed = false;
2155 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
2156 changed = ctrl_changed = true;
2159 * Set has_changed to false to avoid generating
2160 * the event V4L2_EVENT_CTRL_CH_VALUE
2162 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2163 ctrl->has_changed = false;
2167 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
2168 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
2169 ctrl->p_cur, ctrl->p_new);
2170 ctrl->has_changed = ctrl_changed;
2171 changed |= ctrl->has_changed;
2176 /* Control range checking */
2177 static int check_range(enum v4l2_ctrl_type type,
2178 s64 min, s64 max, u64 step, s64 def)
2181 case V4L2_CTRL_TYPE_BOOLEAN:
2182 if (step != 1 || max > 1 || min < 0)
2185 case V4L2_CTRL_TYPE_U8:
2186 case V4L2_CTRL_TYPE_U16:
2187 case V4L2_CTRL_TYPE_U32:
2188 case V4L2_CTRL_TYPE_INTEGER:
2189 case V4L2_CTRL_TYPE_INTEGER64:
2190 if (step == 0 || min > max || def < min || def > max)
2193 case V4L2_CTRL_TYPE_BITMASK:
2194 if (step || min || !max || (def & ~max))
2197 case V4L2_CTRL_TYPE_MENU:
2198 case V4L2_CTRL_TYPE_INTEGER_MENU:
2199 if (min > max || def < min || def > max)
2201 /* Note: step == menu_skip_mask for menu controls.
2202 So here we check if the default value is masked out. */
2203 if (step && ((1 << def) & step))
2206 case V4L2_CTRL_TYPE_STRING:
2207 if (min > max || min < 0 || step < 1 || def)
2215 /* Validate a new control */
2216 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
2221 for (idx = 0; !err && idx < ctrl->elems; idx++)
2222 err = ctrl->type_ops->validate(ctrl, idx, p_new);
2226 static inline u32 node2id(struct list_head *node)
2228 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
2231 /* Set the handler's error code if it wasn't set earlier already */
2232 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
2234 if (hdl->error == 0)
2239 /* Initialize the handler */
2240 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
2241 unsigned nr_of_controls_hint,
2242 struct lock_class_key *key, const char *name)
2244 mutex_init(&hdl->_lock);
2245 hdl->lock = &hdl->_lock;
2246 lockdep_set_class_and_name(hdl->lock, key, name);
2247 INIT_LIST_HEAD(&hdl->ctrls);
2248 INIT_LIST_HEAD(&hdl->ctrl_refs);
2249 INIT_LIST_HEAD(&hdl->requests);
2250 INIT_LIST_HEAD(&hdl->requests_queued);
2251 hdl->request_is_queued = false;
2252 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
2253 hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
2254 sizeof(hdl->buckets[0]),
2255 GFP_KERNEL | __GFP_ZERO);
2256 hdl->error = hdl->buckets ? 0 : -ENOMEM;
2257 media_request_object_init(&hdl->req_obj);
2260 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
2262 /* Free all controls and control refs */
2263 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
2265 struct v4l2_ctrl_ref *ref, *next_ref;
2266 struct v4l2_ctrl *ctrl, *next_ctrl;
2267 struct v4l2_subscribed_event *sev, *next_sev;
2269 if (hdl == NULL || hdl->buckets == NULL)
2272 if (!hdl->req_obj.req && !list_empty(&hdl->requests)) {
2273 struct v4l2_ctrl_handler *req, *next_req;
2275 list_for_each_entry_safe(req, next_req, &hdl->requests, requests) {
2276 media_request_object_unbind(&req->req_obj);
2277 media_request_object_put(&req->req_obj);
2280 mutex_lock(hdl->lock);
2281 /* Free all nodes */
2282 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
2283 list_del(&ref->node);
2286 /* Free all controls owned by the handler */
2287 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
2288 list_del(&ctrl->node);
2289 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
2290 list_del(&sev->node);
2293 kvfree(hdl->buckets);
2294 hdl->buckets = NULL;
2297 mutex_unlock(hdl->lock);
2298 mutex_destroy(&hdl->_lock);
2300 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
2302 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
2303 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
2304 with applications that do not use the NEXT_CTRL flag.
2306 We just find the n-th private user control. It's O(N), but that should not
2307 be an issue in this particular case. */
2308 static struct v4l2_ctrl_ref *find_private_ref(
2309 struct v4l2_ctrl_handler *hdl, u32 id)
2311 struct v4l2_ctrl_ref *ref;
2313 id -= V4L2_CID_PRIVATE_BASE;
2314 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2315 /* Search for private user controls that are compatible with
2317 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
2318 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
2319 if (!ref->ctrl->is_int)
2329 /* Find a control with the given ID. */
2330 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
2332 struct v4l2_ctrl_ref *ref;
2335 id &= V4L2_CTRL_ID_MASK;
2337 /* Old-style private controls need special handling */
2338 if (id >= V4L2_CID_PRIVATE_BASE)
2339 return find_private_ref(hdl, id);
2340 bucket = id % hdl->nr_of_buckets;
2342 /* Simple optimization: cache the last control found */
2343 if (hdl->cached && hdl->cached->ctrl->id == id)
2346 /* Not in cache, search the hash */
2347 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
2348 while (ref && ref->ctrl->id != id)
2352 hdl->cached = ref; /* cache it! */
2356 /* Find a control with the given ID. Take the handler's lock first. */
2357 static struct v4l2_ctrl_ref *find_ref_lock(
2358 struct v4l2_ctrl_handler *hdl, u32 id)
2360 struct v4l2_ctrl_ref *ref = NULL;
2363 mutex_lock(hdl->lock);
2364 ref = find_ref(hdl, id);
2365 mutex_unlock(hdl->lock);
2370 /* Find a control with the given ID. */
2371 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
2373 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
2375 return ref ? ref->ctrl : NULL;
2377 EXPORT_SYMBOL(v4l2_ctrl_find);
2379 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
2380 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
2381 struct v4l2_ctrl *ctrl,
2382 struct v4l2_ctrl_ref **ctrl_ref,
2383 bool from_other_dev, bool allocate_req)
2385 struct v4l2_ctrl_ref *ref;
2386 struct v4l2_ctrl_ref *new_ref;
2388 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
2389 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
2390 unsigned int size_extra_req = 0;
2396 * Automatically add the control class if it is not yet present and
2397 * the new control is not a compound control.
2399 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
2400 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
2401 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
2408 size_extra_req = ctrl->elems * ctrl->elem_size;
2409 new_ref = kzalloc(sizeof(*new_ref) + size_extra_req, GFP_KERNEL);
2411 return handler_set_err(hdl, -ENOMEM);
2412 new_ref->ctrl = ctrl;
2413 new_ref->from_other_dev = from_other_dev;
2415 new_ref->p_req.p = &new_ref[1];
2417 INIT_LIST_HEAD(&new_ref->node);
2419 mutex_lock(hdl->lock);
2421 /* Add immediately at the end of the list if the list is empty, or if
2422 the last element in the list has a lower ID.
2423 This ensures that when elements are added in ascending order the
2424 insertion is an O(1) operation. */
2425 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
2426 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
2427 goto insert_in_hash;
2430 /* Find insert position in sorted list */
2431 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2432 if (ref->ctrl->id < id)
2434 /* Don't add duplicates */
2435 if (ref->ctrl->id == id) {
2439 list_add(&new_ref->node, ref->node.prev);
2444 /* Insert the control node in the hash */
2445 new_ref->next = hdl->buckets[bucket];
2446 hdl->buckets[bucket] = new_ref;
2448 *ctrl_ref = new_ref;
2449 if (ctrl->handler == hdl) {
2450 /* By default each control starts in a cluster of its own.
2451 * new_ref->ctrl is basically a cluster array with one
2452 * element, so that's perfect to use as the cluster pointer.
2453 * But only do this for the handler that owns the control.
2455 ctrl->cluster = &new_ref->ctrl;
2456 ctrl->ncontrols = 1;
2460 mutex_unlock(hdl->lock);
2464 /* Add a new control */
2465 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
2466 const struct v4l2_ctrl_ops *ops,
2467 const struct v4l2_ctrl_type_ops *type_ops,
2468 u32 id, const char *name, enum v4l2_ctrl_type type,
2469 s64 min, s64 max, u64 step, s64 def,
2470 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
2471 u32 flags, const char * const *qmenu,
2472 const s64 *qmenu_int, const union v4l2_ctrl_ptr p_def,
2475 struct v4l2_ctrl *ctrl;
2477 unsigned nr_of_dims = 0;
2480 unsigned tot_ctrl_size;
2488 while (dims && dims[nr_of_dims]) {
2489 elems *= dims[nr_of_dims];
2491 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
2494 is_array = nr_of_dims > 0;
2496 /* Prefill elem_size for all types handled by std_type_ops */
2497 switch ((u32)type) {
2498 case V4L2_CTRL_TYPE_INTEGER64:
2499 elem_size = sizeof(s64);
2501 case V4L2_CTRL_TYPE_STRING:
2502 elem_size = max + 1;
2504 case V4L2_CTRL_TYPE_U8:
2505 elem_size = sizeof(u8);
2507 case V4L2_CTRL_TYPE_U16:
2508 elem_size = sizeof(u16);
2510 case V4L2_CTRL_TYPE_U32:
2511 elem_size = sizeof(u32);
2513 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
2514 elem_size = sizeof(struct v4l2_ctrl_mpeg2_slice_params);
2516 case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
2517 elem_size = sizeof(struct v4l2_ctrl_mpeg2_quantization);
2519 case V4L2_CTRL_TYPE_FWHT_PARAMS:
2520 elem_size = sizeof(struct v4l2_ctrl_fwht_params);
2522 case V4L2_CTRL_TYPE_H264_SPS:
2523 elem_size = sizeof(struct v4l2_ctrl_h264_sps);
2525 case V4L2_CTRL_TYPE_H264_PPS:
2526 elem_size = sizeof(struct v4l2_ctrl_h264_pps);
2528 case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
2529 elem_size = sizeof(struct v4l2_ctrl_h264_scaling_matrix);
2531 case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
2532 elem_size = sizeof(struct v4l2_ctrl_h264_slice_params);
2534 case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
2535 elem_size = sizeof(struct v4l2_ctrl_h264_decode_params);
2537 case V4L2_CTRL_TYPE_VP8_FRAME_HEADER:
2538 elem_size = sizeof(struct v4l2_ctrl_vp8_frame_header);
2540 case V4L2_CTRL_TYPE_HEVC_SPS:
2541 elem_size = sizeof(struct v4l2_ctrl_hevc_sps);
2543 case V4L2_CTRL_TYPE_HEVC_PPS:
2544 elem_size = sizeof(struct v4l2_ctrl_hevc_pps);
2546 case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
2547 elem_size = sizeof(struct v4l2_ctrl_hevc_slice_params);
2549 case V4L2_CTRL_TYPE_AREA:
2550 elem_size = sizeof(struct v4l2_area);
2553 if (type < V4L2_CTRL_COMPOUND_TYPES)
2554 elem_size = sizeof(s32);
2557 tot_ctrl_size = elem_size * elems;
2560 if (id == 0 || name == NULL || !elem_size ||
2561 id >= V4L2_CID_PRIVATE_BASE ||
2562 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2563 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2564 handler_set_err(hdl, -ERANGE);
2567 err = check_range(type, min, max, step, def);
2569 handler_set_err(hdl, err);
2573 (type == V4L2_CTRL_TYPE_BUTTON ||
2574 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2575 handler_set_err(hdl, -EINVAL);
2580 if (type == V4L2_CTRL_TYPE_BUTTON)
2581 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2582 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2583 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2584 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2585 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2586 type == V4L2_CTRL_TYPE_STRING ||
2587 type >= V4L2_CTRL_COMPOUND_TYPES ||
2589 sz_extra += 2 * tot_ctrl_size;
2591 if (type >= V4L2_CTRL_COMPOUND_TYPES && p_def.p_const)
2592 sz_extra += elem_size;
2594 ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2596 handler_set_err(hdl, -ENOMEM);
2600 INIT_LIST_HEAD(&ctrl->node);
2601 INIT_LIST_HEAD(&ctrl->ev_subs);
2602 ctrl->handler = hdl;
2604 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2608 ctrl->flags = flags;
2609 ctrl->minimum = min;
2610 ctrl->maximum = max;
2612 ctrl->default_value = def;
2613 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2614 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2615 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2616 ctrl->is_array = is_array;
2617 ctrl->elems = elems;
2618 ctrl->nr_of_dims = nr_of_dims;
2620 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2621 ctrl->elem_size = elem_size;
2622 if (type == V4L2_CTRL_TYPE_MENU)
2623 ctrl->qmenu = qmenu;
2624 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2625 ctrl->qmenu_int = qmenu_int;
2627 ctrl->cur.val = ctrl->val = def;
2630 if (!ctrl->is_int) {
2631 ctrl->p_new.p = data;
2632 ctrl->p_cur.p = data + tot_ctrl_size;
2634 ctrl->p_new.p = &ctrl->val;
2635 ctrl->p_cur.p = &ctrl->cur.val;
2638 if (type >= V4L2_CTRL_COMPOUND_TYPES && p_def.p_const) {
2639 ctrl->p_def.p = ctrl->p_cur.p + tot_ctrl_size;
2640 memcpy(ctrl->p_def.p, p_def.p_const, elem_size);
2643 for (idx = 0; idx < elems; idx++) {
2644 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2645 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2648 if (handler_new_ref(hdl, ctrl, NULL, false, false)) {
2652 mutex_lock(hdl->lock);
2653 list_add_tail(&ctrl->node, &hdl->ctrls);
2654 mutex_unlock(hdl->lock);
2658 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2659 const struct v4l2_ctrl_config *cfg, void *priv)
2662 struct v4l2_ctrl *ctrl;
2663 const char *name = cfg->name;
2664 const char * const *qmenu = cfg->qmenu;
2665 const s64 *qmenu_int = cfg->qmenu_int;
2666 enum v4l2_ctrl_type type = cfg->type;
2667 u32 flags = cfg->flags;
2670 u64 step = cfg->step;
2674 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2677 is_menu = (type == V4L2_CTRL_TYPE_MENU ||
2678 type == V4L2_CTRL_TYPE_INTEGER_MENU);
2682 WARN_ON(cfg->menu_skip_mask);
2683 if (type == V4L2_CTRL_TYPE_MENU && !qmenu) {
2684 qmenu = v4l2_ctrl_get_menu(cfg->id);
2685 } else if (type == V4L2_CTRL_TYPE_INTEGER_MENU && !qmenu_int) {
2686 handler_set_err(hdl, -EINVAL);
2690 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2692 is_menu ? cfg->menu_skip_mask : step, def,
2693 cfg->dims, cfg->elem_size,
2694 flags, qmenu, qmenu_int, cfg->p_def, priv);
2696 ctrl->is_private = cfg->is_private;
2699 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2701 /* Helper function for standard non-menu controls */
2702 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2703 const struct v4l2_ctrl_ops *ops,
2704 u32 id, s64 min, s64 max, u64 step, s64 def)
2707 enum v4l2_ctrl_type type;
2710 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2711 if (type == V4L2_CTRL_TYPE_MENU ||
2712 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2713 type >= V4L2_CTRL_COMPOUND_TYPES) {
2714 handler_set_err(hdl, -EINVAL);
2717 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2718 min, max, step, def, NULL, 0,
2719 flags, NULL, NULL, ptr_null, NULL);
2721 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2723 /* Helper function for standard menu controls */
2724 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2725 const struct v4l2_ctrl_ops *ops,
2726 u32 id, u8 _max, u64 mask, u8 _def)
2728 const char * const *qmenu = NULL;
2729 const s64 *qmenu_int = NULL;
2730 unsigned int qmenu_int_len = 0;
2732 enum v4l2_ctrl_type type;
2739 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2741 if (type == V4L2_CTRL_TYPE_MENU)
2742 qmenu = v4l2_ctrl_get_menu(id);
2743 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2744 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2746 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2747 handler_set_err(hdl, -EINVAL);
2750 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2751 0, max, mask, def, NULL, 0,
2752 flags, qmenu, qmenu_int, ptr_null, NULL);
2754 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2756 /* Helper function for standard menu controls with driver defined menu */
2757 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2758 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2759 u64 mask, u8 _def, const char * const *qmenu)
2761 enum v4l2_ctrl_type type;
2769 /* v4l2_ctrl_new_std_menu_items() should only be called for
2770 * standard controls without a standard menu.
2772 if (v4l2_ctrl_get_menu(id)) {
2773 handler_set_err(hdl, -EINVAL);
2777 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2778 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2779 handler_set_err(hdl, -EINVAL);
2782 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2783 0, max, mask, def, NULL, 0,
2784 flags, qmenu, NULL, ptr_null, NULL);
2787 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2789 /* Helper function for standard compound controls */
2790 struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl,
2791 const struct v4l2_ctrl_ops *ops, u32 id,
2792 const union v4l2_ctrl_ptr p_def)
2795 enum v4l2_ctrl_type type;
2797 s64 min, max, step, def;
2799 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2800 if (type < V4L2_CTRL_COMPOUND_TYPES) {
2801 handler_set_err(hdl, -EINVAL);
2804 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2805 min, max, step, def, NULL, 0,
2806 flags, NULL, NULL, p_def, NULL);
2808 EXPORT_SYMBOL(v4l2_ctrl_new_std_compound);
2810 /* Helper function for standard integer menu controls */
2811 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2812 const struct v4l2_ctrl_ops *ops,
2813 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2816 enum v4l2_ctrl_type type;
2823 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2824 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2825 handler_set_err(hdl, -EINVAL);
2828 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2829 0, max, 0, def, NULL, 0,
2830 flags, NULL, qmenu_int, ptr_null, NULL);
2832 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2834 /* Add the controls from another handler to our own. */
2835 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2836 struct v4l2_ctrl_handler *add,
2837 bool (*filter)(const struct v4l2_ctrl *ctrl),
2838 bool from_other_dev)
2840 struct v4l2_ctrl_ref *ref;
2843 /* Do nothing if either handler is NULL or if they are the same */
2844 if (!hdl || !add || hdl == add)
2848 mutex_lock(add->lock);
2849 list_for_each_entry(ref, &add->ctrl_refs, node) {
2850 struct v4l2_ctrl *ctrl = ref->ctrl;
2852 /* Skip handler-private controls. */
2853 if (ctrl->is_private)
2855 /* And control classes */
2856 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2858 /* Filter any unwanted controls */
2859 if (filter && !filter(ctrl))
2861 ret = handler_new_ref(hdl, ctrl, NULL, from_other_dev, false);
2865 mutex_unlock(add->lock);
2868 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2870 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2872 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2874 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2877 case V4L2_CID_AUDIO_MUTE:
2878 case V4L2_CID_AUDIO_VOLUME:
2879 case V4L2_CID_AUDIO_BALANCE:
2880 case V4L2_CID_AUDIO_BASS:
2881 case V4L2_CID_AUDIO_TREBLE:
2882 case V4L2_CID_AUDIO_LOUDNESS:
2889 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2891 /* Cluster controls */
2892 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2894 bool has_volatiles = false;
2897 /* The first control is the master control and it must not be NULL */
2898 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2901 for (i = 0; i < ncontrols; i++) {
2903 controls[i]->cluster = controls;
2904 controls[i]->ncontrols = ncontrols;
2905 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2906 has_volatiles = true;
2909 controls[0]->has_volatiles = has_volatiles;
2911 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2913 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2914 u8 manual_val, bool set_volatile)
2916 struct v4l2_ctrl *master = controls[0];
2920 v4l2_ctrl_cluster(ncontrols, controls);
2921 WARN_ON(ncontrols <= 1);
2922 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2923 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2924 master->is_auto = true;
2925 master->has_volatiles = set_volatile;
2926 master->manual_mode_value = manual_val;
2927 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2929 if (!is_cur_manual(master))
2930 flag = V4L2_CTRL_FLAG_INACTIVE |
2931 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2933 for (i = 1; i < ncontrols; i++)
2935 controls[i]->flags |= flag;
2937 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2939 /* Activate/deactivate a control. */
2940 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2942 /* invert since the actual flag is called 'inactive' */
2943 bool inactive = !active;
2950 /* set V4L2_CTRL_FLAG_INACTIVE */
2951 old = test_and_set_bit(4, &ctrl->flags);
2953 /* clear V4L2_CTRL_FLAG_INACTIVE */
2954 old = test_and_clear_bit(4, &ctrl->flags);
2955 if (old != inactive)
2956 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2958 EXPORT_SYMBOL(v4l2_ctrl_activate);
2960 void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2967 lockdep_assert_held(ctrl->handler->lock);
2970 /* set V4L2_CTRL_FLAG_GRABBED */
2971 old = test_and_set_bit(1, &ctrl->flags);
2973 /* clear V4L2_CTRL_FLAG_GRABBED */
2974 old = test_and_clear_bit(1, &ctrl->flags);
2976 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2978 EXPORT_SYMBOL(__v4l2_ctrl_grab);
2980 /* Log the control name and value */
2981 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2982 const char *prefix, const char *colon)
2984 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2986 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2989 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2991 ctrl->type_ops->log(ctrl);
2993 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2994 V4L2_CTRL_FLAG_GRABBED |
2995 V4L2_CTRL_FLAG_VOLATILE)) {
2996 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2997 pr_cont(" inactive");
2998 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2999 pr_cont(" grabbed");
3000 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
3001 pr_cont(" volatile");
3006 /* Log all controls owned by the handler */
3007 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
3010 struct v4l2_ctrl *ctrl;
3011 const char *colon = "";
3018 len = strlen(prefix);
3019 if (len && prefix[len - 1] != ' ')
3021 mutex_lock(hdl->lock);
3022 list_for_each_entry(ctrl, &hdl->ctrls, node)
3023 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
3024 log_ctrl(ctrl, prefix, colon);
3025 mutex_unlock(hdl->lock);
3027 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
3029 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
3031 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
3034 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
3036 /* Call s_ctrl for all controls owned by the handler */
3037 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
3039 struct v4l2_ctrl *ctrl;
3045 lockdep_assert_held(hdl->lock);
3047 list_for_each_entry(ctrl, &hdl->ctrls, node)
3050 list_for_each_entry(ctrl, &hdl->ctrls, node) {
3051 struct v4l2_ctrl *master = ctrl->cluster[0];
3054 /* Skip if this control was already handled by a cluster. */
3055 /* Skip button controls and read-only controls. */
3056 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
3057 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
3060 for (i = 0; i < master->ncontrols; i++) {
3061 if (master->cluster[i]) {
3062 cur_to_new(master->cluster[i]);
3063 master->cluster[i]->is_new = 1;
3064 master->cluster[i]->done = true;
3067 ret = call_op(master, s_ctrl);
3074 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
3076 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
3083 mutex_lock(hdl->lock);
3084 ret = __v4l2_ctrl_handler_setup(hdl);
3085 mutex_unlock(hdl->lock);
3089 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
3091 /* Implement VIDIOC_QUERY_EXT_CTRL */
3092 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
3094 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
3095 u32 id = qc->id & V4L2_CTRL_ID_MASK;
3096 struct v4l2_ctrl_ref *ref;
3097 struct v4l2_ctrl *ctrl;
3102 mutex_lock(hdl->lock);
3104 /* Try to find it */
3105 ref = find_ref(hdl, id);
3107 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
3109 /* Match any control that is not hidden */
3113 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
3114 /* Match any hidden control */
3116 } else if ((qc->id & next_flags) == next_flags) {
3117 /* Match any control, compound or not */
3121 /* Find the next control with ID > qc->id */
3123 /* Did we reach the end of the control list? */
3124 if (id >= node2id(hdl->ctrl_refs.prev)) {
3125 ref = NULL; /* Yes, so there is no next control */
3127 /* We found a control with the given ID, so just get
3128 the next valid one in the list. */
3129 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
3130 is_compound = ref->ctrl->is_array ||
3131 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
3132 if (id < ref->ctrl->id &&
3133 (is_compound & mask) == match)
3136 if (&ref->node == &hdl->ctrl_refs)
3139 /* No control with the given ID exists, so start
3140 searching for the next largest ID. We know there
3141 is one, otherwise the first 'if' above would have
3143 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
3144 is_compound = ref->ctrl->is_array ||
3145 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
3146 if (id < ref->ctrl->id &&
3147 (is_compound & mask) == match)
3150 if (&ref->node == &hdl->ctrl_refs)
3154 mutex_unlock(hdl->lock);
3160 memset(qc, 0, sizeof(*qc));
3161 if (id >= V4L2_CID_PRIVATE_BASE)
3165 strscpy(qc->name, ctrl->name, sizeof(qc->name));
3166 qc->flags = user_flags(ctrl);
3167 qc->type = ctrl->type;
3168 qc->elem_size = ctrl->elem_size;
3169 qc->elems = ctrl->elems;
3170 qc->nr_of_dims = ctrl->nr_of_dims;
3171 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
3172 qc->minimum = ctrl->minimum;
3173 qc->maximum = ctrl->maximum;
3174 qc->default_value = ctrl->default_value;
3175 if (ctrl->type == V4L2_CTRL_TYPE_MENU
3176 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
3179 qc->step = ctrl->step;
3182 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
3184 /* Implement VIDIOC_QUERYCTRL */
3185 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
3187 struct v4l2_query_ext_ctrl qec = { qc->id };
3190 rc = v4l2_query_ext_ctrl(hdl, &qec);
3195 qc->type = qec.type;
3196 qc->flags = qec.flags;
3197 strscpy(qc->name, qec.name, sizeof(qc->name));
3199 case V4L2_CTRL_TYPE_INTEGER:
3200 case V4L2_CTRL_TYPE_BOOLEAN:
3201 case V4L2_CTRL_TYPE_MENU:
3202 case V4L2_CTRL_TYPE_INTEGER_MENU:
3203 case V4L2_CTRL_TYPE_STRING:
3204 case V4L2_CTRL_TYPE_BITMASK:
3205 qc->minimum = qec.minimum;
3206 qc->maximum = qec.maximum;
3207 qc->step = qec.step;
3208 qc->default_value = qec.default_value;
3214 qc->default_value = 0;
3219 EXPORT_SYMBOL(v4l2_queryctrl);
3221 /* Implement VIDIOC_QUERYMENU */
3222 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
3224 struct v4l2_ctrl *ctrl;
3227 ctrl = v4l2_ctrl_find(hdl, qm->id);
3233 switch (ctrl->type) {
3234 case V4L2_CTRL_TYPE_MENU:
3235 if (ctrl->qmenu == NULL)
3238 case V4L2_CTRL_TYPE_INTEGER_MENU:
3239 if (ctrl->qmenu_int == NULL)
3246 if (i < ctrl->minimum || i > ctrl->maximum)
3249 /* Use mask to see if this menu item should be skipped */
3250 if (ctrl->menu_skip_mask & (1ULL << i))
3252 /* Empty menu items should also be skipped */
3253 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
3254 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
3256 strscpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
3258 qm->value = ctrl->qmenu_int[i];
3262 EXPORT_SYMBOL(v4l2_querymenu);
3264 static int v4l2_ctrl_request_clone(struct v4l2_ctrl_handler *hdl,
3265 const struct v4l2_ctrl_handler *from)
3267 struct v4l2_ctrl_ref *ref;
3270 if (WARN_ON(!hdl || hdl == from))
3276 WARN_ON(hdl->lock != &hdl->_lock);
3278 mutex_lock(from->lock);
3279 list_for_each_entry(ref, &from->ctrl_refs, node) {
3280 struct v4l2_ctrl *ctrl = ref->ctrl;
3281 struct v4l2_ctrl_ref *new_ref;
3283 /* Skip refs inherited from other devices */
3284 if (ref->from_other_dev)
3287 if (ctrl->type == V4L2_CTRL_TYPE_BUTTON)
3289 err = handler_new_ref(hdl, ctrl, &new_ref, false, true);
3293 mutex_unlock(from->lock);
3297 static void v4l2_ctrl_request_queue(struct media_request_object *obj)
3299 struct v4l2_ctrl_handler *hdl =
3300 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3301 struct v4l2_ctrl_handler *main_hdl = obj->priv;
3302 struct v4l2_ctrl_handler *prev_hdl = NULL;
3303 struct v4l2_ctrl_ref *ref_ctrl, *ref_ctrl_prev = NULL;
3305 mutex_lock(main_hdl->lock);
3306 if (list_empty(&main_hdl->requests_queued))
3309 prev_hdl = list_last_entry(&main_hdl->requests_queued,
3310 struct v4l2_ctrl_handler, requests_queued);
3312 * Note: prev_hdl and hdl must contain the same list of control
3313 * references, so if any differences are detected then that is a
3314 * driver bug and the WARN_ON is triggered.
3316 mutex_lock(prev_hdl->lock);
3317 ref_ctrl_prev = list_first_entry(&prev_hdl->ctrl_refs,
3318 struct v4l2_ctrl_ref, node);
3319 list_for_each_entry(ref_ctrl, &hdl->ctrl_refs, node) {
3322 while (ref_ctrl_prev->ctrl->id < ref_ctrl->ctrl->id) {
3323 /* Should never happen, but just in case... */
3324 if (list_is_last(&ref_ctrl_prev->node,
3325 &prev_hdl->ctrl_refs))
3327 ref_ctrl_prev = list_next_entry(ref_ctrl_prev, node);
3329 if (WARN_ON(ref_ctrl_prev->ctrl->id != ref_ctrl->ctrl->id))
3331 ref_ctrl->req = ref_ctrl_prev->req;
3333 mutex_unlock(prev_hdl->lock);
3335 list_add_tail(&hdl->requests_queued, &main_hdl->requests_queued);
3336 hdl->request_is_queued = true;
3337 mutex_unlock(main_hdl->lock);
3340 static void v4l2_ctrl_request_unbind(struct media_request_object *obj)
3342 struct v4l2_ctrl_handler *hdl =
3343 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3344 struct v4l2_ctrl_handler *main_hdl = obj->priv;
3346 list_del_init(&hdl->requests);
3347 mutex_lock(main_hdl->lock);
3348 if (hdl->request_is_queued) {
3349 list_del_init(&hdl->requests_queued);
3350 hdl->request_is_queued = false;
3352 mutex_unlock(main_hdl->lock);
3355 static void v4l2_ctrl_request_release(struct media_request_object *obj)
3357 struct v4l2_ctrl_handler *hdl =
3358 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3360 v4l2_ctrl_handler_free(hdl);
3364 static const struct media_request_object_ops req_ops = {
3365 .queue = v4l2_ctrl_request_queue,
3366 .unbind = v4l2_ctrl_request_unbind,
3367 .release = v4l2_ctrl_request_release,
3370 struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
3371 struct v4l2_ctrl_handler *parent)
3373 struct media_request_object *obj;
3375 if (WARN_ON(req->state != MEDIA_REQUEST_STATE_VALIDATING &&
3376 req->state != MEDIA_REQUEST_STATE_QUEUED))
3379 obj = media_request_object_find(req, &req_ops, parent);
3381 return container_of(obj, struct v4l2_ctrl_handler, req_obj);
3384 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_find);
3387 v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
3389 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
3391 return (ref && ref->req == ref) ? ref->ctrl : NULL;
3393 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_ctrl_find);
3395 static int v4l2_ctrl_request_bind(struct media_request *req,
3396 struct v4l2_ctrl_handler *hdl,
3397 struct v4l2_ctrl_handler *from)
3401 ret = v4l2_ctrl_request_clone(hdl, from);
3404 ret = media_request_object_bind(req, &req_ops,
3405 from, false, &hdl->req_obj);
3407 list_add_tail(&hdl->requests, &from->requests);
3412 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
3414 It is not a fully atomic operation, just best-effort only. After all, if
3415 multiple controls have to be set through multiple i2c writes (for example)
3416 then some initial writes may succeed while others fail. Thus leaving the
3417 system in an inconsistent state. The question is how much effort you are
3418 willing to spend on trying to make something atomic that really isn't.
3420 From the point of view of an application the main requirement is that
3421 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
3422 error should be returned without actually affecting any controls.
3424 If all the values are correct, then it is acceptable to just give up
3425 in case of low-level errors.
3427 It is important though that the application can tell when only a partial
3428 configuration was done. The way we do that is through the error_idx field
3429 of struct v4l2_ext_controls: if that is equal to the count field then no
3430 controls were affected. Otherwise all controls before that index were
3431 successful in performing their 'get' or 'set' operation, the control at
3432 the given index failed, and you don't know what happened with the controls
3433 after the failed one. Since if they were part of a control cluster they
3434 could have been successfully processed (if a cluster member was encountered
3435 at index < error_idx), they could have failed (if a cluster member was at
3436 error_idx), or they may not have been processed yet (if the first cluster
3437 member appeared after error_idx).
3439 It is all fairly theoretical, though. In practice all you can do is to
3440 bail out. If error_idx == count, then it is an application bug. If
3441 error_idx < count then it is only an application bug if the error code was
3442 EBUSY. That usually means that something started streaming just when you
3443 tried to set the controls. In all other cases it is a driver/hardware
3444 problem and all you can do is to retry or bail out.
3446 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
3447 never modifies controls the error_idx is just set to whatever control
3448 has an invalid value.
3451 /* Prepare for the extended g/s/try functions.
3452 Find the controls in the control array and do some basic checks. */
3453 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
3454 struct v4l2_ext_controls *cs,
3455 struct v4l2_ctrl_helper *helpers,
3456 struct video_device *vdev,
3459 struct v4l2_ctrl_helper *h;
3460 bool have_clusters = false;
3463 for (i = 0, h = helpers; i < cs->count; i++, h++) {
3464 struct v4l2_ext_control *c = &cs->controls[i];
3465 struct v4l2_ctrl_ref *ref;
3466 struct v4l2_ctrl *ctrl;
3467 u32 id = c->id & V4L2_CTRL_ID_MASK;
3472 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
3473 cs->which != V4L2_CTRL_WHICH_REQUEST_VAL &&
3474 V4L2_CTRL_ID2WHICH(id) != cs->which) {
3476 "invalid which 0x%x or control id 0x%x\n",
3481 /* Old-style private controls are not allowed for
3482 extended controls */
3483 if (id >= V4L2_CID_PRIVATE_BASE) {
3485 "old-style private controls not allowed\n");
3488 ref = find_ref_lock(hdl, id);
3490 dprintk(vdev, "cannot find control id 0x%x\n", id);
3495 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED) {
3496 dprintk(vdev, "control id 0x%x is disabled\n", id);
3500 if (ctrl->cluster[0]->ncontrols > 1)
3501 have_clusters = true;
3502 if (ctrl->cluster[0] != ctrl)
3503 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
3504 if (ctrl->is_ptr && !ctrl->is_string) {
3505 unsigned tot_size = ctrl->elems * ctrl->elem_size;
3507 if (c->size < tot_size) {
3509 * In the get case the application first
3510 * queries to obtain the size of the control.
3517 "pointer control id 0x%x size too small, %d bytes but %d bytes needed\n",
3518 id, c->size, tot_size);
3523 /* Store the ref to the master control of the cluster */
3525 /* Initially set next to 0, meaning that there is no other
3526 control in this helper array belonging to the same
3531 /* We are done if there were no controls that belong to a multi-
3536 /* The code below figures out in O(n) time which controls in the list
3537 belong to the same cluster. */
3539 /* This has to be done with the handler lock taken. */
3540 mutex_lock(hdl->lock);
3542 /* First zero the helper field in the master control references */
3543 for (i = 0; i < cs->count; i++)
3544 helpers[i].mref->helper = NULL;
3545 for (i = 0, h = helpers; i < cs->count; i++, h++) {
3546 struct v4l2_ctrl_ref *mref = h->mref;
3548 /* If the mref->helper is set, then it points to an earlier
3549 helper that belongs to the same cluster. */
3551 /* Set the next field of mref->helper to the current
3552 index: this means that that earlier helper now
3553 points to the next helper in the same cluster. */
3554 mref->helper->next = i;
3555 /* mref should be set only for the first helper in the
3556 cluster, clear the others. */
3559 /* Point the mref helper to the current helper struct. */
3562 mutex_unlock(hdl->lock);
3566 /* Handles the corner case where cs->count == 0. It checks whether the
3567 specified control class exists. If that class ID is 0, then it checks
3568 whether there are any controls at all. */
3569 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
3571 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL ||
3572 which == V4L2_CTRL_WHICH_REQUEST_VAL)
3574 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
3577 /* Get extended controls. Allocates the helpers array if needed. */
3578 static int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl,
3579 struct v4l2_ext_controls *cs,
3580 struct video_device *vdev)
3582 struct v4l2_ctrl_helper helper[4];
3583 struct v4l2_ctrl_helper *helpers = helper;
3588 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
3590 cs->error_idx = cs->count;
3591 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3597 return class_check(hdl, cs->which);
3599 if (cs->count > ARRAY_SIZE(helper)) {
3600 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3602 if (helpers == NULL)
3606 ret = prepare_ext_ctrls(hdl, cs, helpers, vdev, true);
3607 cs->error_idx = cs->count;
3609 for (i = 0; !ret && i < cs->count; i++)
3610 if (helpers[i].ref->ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3613 for (i = 0; !ret && i < cs->count; i++) {
3614 int (*ctrl_to_user)(struct v4l2_ext_control *c,
3615 struct v4l2_ctrl *ctrl);
3616 struct v4l2_ctrl *master;
3618 ctrl_to_user = def_value ? def_to_user : cur_to_user;
3620 if (helpers[i].mref == NULL)
3623 master = helpers[i].mref->ctrl;
3626 v4l2_ctrl_lock(master);
3628 /* g_volatile_ctrl will update the new control values */
3630 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
3631 (master->has_volatiles && !is_cur_manual(master)))) {
3632 for (j = 0; j < master->ncontrols; j++)
3633 cur_to_new(master->cluster[j]);
3634 ret = call_op(master, g_volatile_ctrl);
3635 ctrl_to_user = new_to_user;
3637 /* If OK, then copy the current (for non-volatile controls)
3638 or the new (for volatile controls) control values to the
3644 if (helpers[idx].ref->req)
3645 ret = req_to_user(cs->controls + idx,
3646 helpers[idx].ref->req);
3648 ret = ctrl_to_user(cs->controls + idx,
3649 helpers[idx].ref->ctrl);
3650 idx = helpers[idx].next;
3651 } while (!ret && idx);
3653 v4l2_ctrl_unlock(master);
3656 if (cs->count > ARRAY_SIZE(helper))
3661 static struct media_request_object *
3662 v4l2_ctrls_find_req_obj(struct v4l2_ctrl_handler *hdl,
3663 struct media_request *req, bool set)
3665 struct media_request_object *obj;
3666 struct v4l2_ctrl_handler *new_hdl;
3670 return ERR_CAST(req);
3672 if (set && WARN_ON(req->state != MEDIA_REQUEST_STATE_UPDATING))
3673 return ERR_PTR(-EBUSY);
3675 obj = media_request_object_find(req, &req_ops, hdl);
3679 return ERR_PTR(-ENOENT);
3681 new_hdl = kzalloc(sizeof(*new_hdl), GFP_KERNEL);
3683 return ERR_PTR(-ENOMEM);
3685 obj = &new_hdl->req_obj;
3686 ret = v4l2_ctrl_handler_init(new_hdl, (hdl->nr_of_buckets - 1) * 8);
3688 ret = v4l2_ctrl_request_bind(req, new_hdl, hdl);
3692 return ERR_PTR(ret);
3695 media_request_object_get(obj);
3699 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct video_device *vdev,
3700 struct media_device *mdev, struct v4l2_ext_controls *cs)
3702 struct media_request_object *obj = NULL;
3703 struct media_request *req = NULL;
3706 if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3707 if (!mdev || cs->request_fd < 0)
3710 req = media_request_get_by_fd(mdev, cs->request_fd);
3712 return PTR_ERR(req);
3714 if (req->state != MEDIA_REQUEST_STATE_COMPLETE) {
3715 media_request_put(req);
3719 ret = media_request_lock_for_access(req);
3721 media_request_put(req);
3725 obj = v4l2_ctrls_find_req_obj(hdl, req, false);
3727 media_request_unlock_for_access(req);
3728 media_request_put(req);
3729 return PTR_ERR(obj);
3732 hdl = container_of(obj, struct v4l2_ctrl_handler,
3736 ret = v4l2_g_ext_ctrls_common(hdl, cs, vdev);
3739 media_request_unlock_for_access(req);
3740 media_request_object_put(obj);
3741 media_request_put(req);
3745 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
3747 /* Helper function to get a single control */
3748 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
3750 struct v4l2_ctrl *master = ctrl->cluster[0];
3754 /* Compound controls are not supported. The new_to_user() and
3755 * cur_to_user() calls below would need to be modified not to access
3756 * userspace memory when called from get_ctrl().
3758 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
3761 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3764 v4l2_ctrl_lock(master);
3765 /* g_volatile_ctrl will update the current control values */
3766 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3767 for (i = 0; i < master->ncontrols; i++)
3768 cur_to_new(master->cluster[i]);
3769 ret = call_op(master, g_volatile_ctrl);
3770 new_to_user(c, ctrl);
3772 cur_to_user(c, ctrl);
3774 v4l2_ctrl_unlock(master);
3778 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
3780 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3781 struct v4l2_ext_control c;
3784 if (ctrl == NULL || !ctrl->is_int)
3786 ret = get_ctrl(ctrl, &c);
3787 control->value = c.value;
3790 EXPORT_SYMBOL(v4l2_g_ctrl);
3792 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
3794 struct v4l2_ext_control c;
3796 /* It's a driver bug if this happens. */
3797 WARN_ON(!ctrl->is_int);
3802 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
3804 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
3806 struct v4l2_ext_control c;
3808 /* It's a driver bug if this happens. */
3809 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3814 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
3817 /* Core function that calls try/s_ctrl and ensures that the new value is
3818 copied to the current value on a set.
3819 Must be called with ctrl->handler->lock held. */
3820 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
3821 bool set, u32 ch_flags)
3827 /* Go through the cluster and either validate the new value or
3828 (if no new value was set), copy the current value to the new
3829 value, ensuring a consistent view for the control ops when
3831 for (i = 0; i < master->ncontrols; i++) {
3832 struct v4l2_ctrl *ctrl = master->cluster[i];
3837 if (!ctrl->is_new) {
3841 /* Check again: it may have changed since the
3842 previous check in try_or_set_ext_ctrls(). */
3843 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3847 ret = call_op(master, try_ctrl);
3849 /* Don't set if there is no change */
3850 if (ret || !set || !cluster_changed(master))
3852 ret = call_op(master, s_ctrl);
3856 /* If OK, then make the new values permanent. */
3857 update_flag = is_cur_manual(master) != is_new_manual(master);
3859 for (i = 0; i < master->ncontrols; i++) {
3861 * If we switch from auto to manual mode, and this cluster
3862 * contains volatile controls, then all non-master controls
3863 * have to be marked as changed. The 'new' value contains
3864 * the volatile value (obtained by update_from_auto_cluster),
3865 * which now has to become the current value.
3867 if (i && update_flag && is_new_manual(master) &&
3868 master->has_volatiles && master->cluster[i])
3869 master->cluster[i]->has_changed = true;
3871 new_to_cur(fh, master->cluster[i], ch_flags |
3872 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3877 /* Validate controls. */
3878 static int validate_ctrls(struct v4l2_ext_controls *cs,
3879 struct v4l2_ctrl_helper *helpers,
3880 struct video_device *vdev,
3886 cs->error_idx = cs->count;
3887 for (i = 0; i < cs->count; i++) {
3888 struct v4l2_ctrl *ctrl = helpers[i].ref->ctrl;
3889 union v4l2_ctrl_ptr p_new;
3893 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY) {
3895 "control id 0x%x is read-only\n",
3899 /* This test is also done in try_set_control_cluster() which
3900 is called in atomic context, so that has the final say,
3901 but it makes sense to do an up-front check as well. Once
3902 an error occurs in try_set_control_cluster() some other
3903 controls may have been set already and we want to do a
3904 best-effort to avoid that. */
3905 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)) {
3907 "control id 0x%x is grabbed, cannot set\n",
3912 * Skip validation for now if the payload needs to be copied
3913 * from userspace into kernelspace. We'll validate those later.
3917 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3918 p_new.p_s64 = &cs->controls[i].value64;
3920 p_new.p_s32 = &cs->controls[i].value;
3921 ret = validate_new(ctrl, p_new);
3928 /* Obtain the current volatile values of an autocluster and mark them
3930 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3934 for (i = 1; i < master->ncontrols; i++)
3935 cur_to_new(master->cluster[i]);
3936 if (!call_op(master, g_volatile_ctrl))
3937 for (i = 1; i < master->ncontrols; i++)
3938 if (master->cluster[i])
3939 master->cluster[i]->is_new = 1;
3942 /* Try or try-and-set controls */
3943 static int try_set_ext_ctrls_common(struct v4l2_fh *fh,
3944 struct v4l2_ctrl_handler *hdl,
3945 struct v4l2_ext_controls *cs,
3946 struct video_device *vdev, bool set)
3948 struct v4l2_ctrl_helper helper[4];
3949 struct v4l2_ctrl_helper *helpers = helper;
3953 cs->error_idx = cs->count;
3955 /* Default value cannot be changed */
3956 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL) {
3957 dprintk(vdev, "%s: cannot change default value\n",
3958 video_device_node_name(vdev));
3962 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3965 dprintk(vdev, "%s: invalid null control handler\n",
3966 video_device_node_name(vdev));
3971 return class_check(hdl, cs->which);
3973 if (cs->count > ARRAY_SIZE(helper)) {
3974 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3979 ret = prepare_ext_ctrls(hdl, cs, helpers, vdev, false);
3981 ret = validate_ctrls(cs, helpers, vdev, set);
3983 cs->error_idx = cs->count;
3984 for (i = 0; !ret && i < cs->count; i++) {
3985 struct v4l2_ctrl *master;
3988 if (helpers[i].mref == NULL)
3992 master = helpers[i].mref->ctrl;
3993 v4l2_ctrl_lock(master);
3995 /* Reset the 'is_new' flags of the cluster */
3996 for (j = 0; j < master->ncontrols; j++)
3997 if (master->cluster[j])
3998 master->cluster[j]->is_new = 0;
4000 /* For volatile autoclusters that are currently in auto mode
4001 we need to discover if it will be set to manual mode.
4002 If so, then we have to copy the current volatile values
4003 first since those will become the new manual values (which
4004 may be overwritten by explicit new values from this set
4006 if (master->is_auto && master->has_volatiles &&
4007 !is_cur_manual(master)) {
4008 /* Pick an initial non-manual value */
4009 s32 new_auto_val = master->manual_mode_value + 1;
4013 /* Check if the auto control is part of the
4014 list, and remember the new value. */
4015 if (helpers[tmp_idx].ref->ctrl == master)
4016 new_auto_val = cs->controls[tmp_idx].value;
4017 tmp_idx = helpers[tmp_idx].next;
4019 /* If the new value == the manual value, then copy
4020 the current volatile values. */
4021 if (new_auto_val == master->manual_mode_value)
4022 update_from_auto_cluster(master);
4025 /* Copy the new caller-supplied control values.
4026 user_to_new() sets 'is_new' to 1. */
4028 struct v4l2_ctrl *ctrl = helpers[idx].ref->ctrl;
4030 ret = user_to_new(cs->controls + idx, ctrl);
4031 if (!ret && ctrl->is_ptr)
4032 ret = validate_new(ctrl, ctrl->p_new);
4033 idx = helpers[idx].next;
4034 } while (!ret && idx);
4037 ret = try_or_set_cluster(fh, master,
4038 !hdl->req_obj.req && set, 0);
4039 if (!ret && hdl->req_obj.req && set) {
4040 for (j = 0; j < master->ncontrols; j++) {
4041 struct v4l2_ctrl_ref *ref =
4042 find_ref(hdl, master->cluster[j]->id);
4048 /* Copy the new values back to userspace. */
4052 ret = new_to_user(cs->controls + idx,
4053 helpers[idx].ref->ctrl);
4054 idx = helpers[idx].next;
4055 } while (!ret && idx);
4057 v4l2_ctrl_unlock(master);
4060 if (cs->count > ARRAY_SIZE(helper))
4065 static int try_set_ext_ctrls(struct v4l2_fh *fh,
4066 struct v4l2_ctrl_handler *hdl,
4067 struct video_device *vdev,
4068 struct media_device *mdev,
4069 struct v4l2_ext_controls *cs, bool set)
4071 struct media_request_object *obj = NULL;
4072 struct media_request *req = NULL;
4075 if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
4077 dprintk(vdev, "%s: missing media device\n",
4078 video_device_node_name(vdev));
4082 if (cs->request_fd < 0) {
4083 dprintk(vdev, "%s: invalid request fd %d\n",
4084 video_device_node_name(vdev), cs->request_fd);
4088 req = media_request_get_by_fd(mdev, cs->request_fd);
4090 dprintk(vdev, "%s: cannot find request fd %d\n",
4091 video_device_node_name(vdev), cs->request_fd);
4092 return PTR_ERR(req);
4095 ret = media_request_lock_for_update(req);
4097 dprintk(vdev, "%s: cannot lock request fd %d\n",
4098 video_device_node_name(vdev), cs->request_fd);
4099 media_request_put(req);
4103 obj = v4l2_ctrls_find_req_obj(hdl, req, set);
4106 "%s: cannot find request object for request fd %d\n",
4107 video_device_node_name(vdev),
4109 media_request_unlock_for_update(req);
4110 media_request_put(req);
4111 return PTR_ERR(obj);
4113 hdl = container_of(obj, struct v4l2_ctrl_handler,
4117 ret = try_set_ext_ctrls_common(fh, hdl, cs, vdev, set);
4120 "%s: try_set_ext_ctrls_common failed (%d)\n",
4121 video_device_node_name(vdev), ret);
4124 media_request_unlock_for_update(req);
4125 media_request_object_put(obj);
4126 media_request_put(req);
4132 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl,
4133 struct video_device *vdev,
4134 struct media_device *mdev,
4135 struct v4l2_ext_controls *cs)
4137 return try_set_ext_ctrls(NULL, hdl, vdev, mdev, cs, false);
4139 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
4141 int v4l2_s_ext_ctrls(struct v4l2_fh *fh,
4142 struct v4l2_ctrl_handler *hdl,
4143 struct video_device *vdev,
4144 struct media_device *mdev,
4145 struct v4l2_ext_controls *cs)
4147 return try_set_ext_ctrls(fh, hdl, vdev, mdev, cs, true);
4149 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
4151 /* Helper function for VIDIOC_S_CTRL compatibility */
4152 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
4154 struct v4l2_ctrl *master = ctrl->cluster[0];
4158 /* Reset the 'is_new' flags of the cluster */
4159 for (i = 0; i < master->ncontrols; i++)
4160 if (master->cluster[i])
4161 master->cluster[i]->is_new = 0;
4163 ret = validate_new(ctrl, ctrl->p_new);
4167 /* For autoclusters with volatiles that are switched from auto to
4168 manual mode we have to update the current volatile values since
4169 those will become the initial manual values after such a switch. */
4170 if (master->is_auto && master->has_volatiles && ctrl == master &&
4171 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
4172 update_from_auto_cluster(master);
4175 return try_or_set_cluster(fh, master, true, ch_flags);
4178 /* Helper function for VIDIOC_S_CTRL compatibility */
4179 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
4180 struct v4l2_ext_control *c)
4184 v4l2_ctrl_lock(ctrl);
4185 user_to_new(c, ctrl);
4186 ret = set_ctrl(fh, ctrl, 0);
4188 cur_to_user(c, ctrl);
4189 v4l2_ctrl_unlock(ctrl);
4193 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
4194 struct v4l2_control *control)
4196 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
4197 struct v4l2_ext_control c = { control->id };
4200 if (ctrl == NULL || !ctrl->is_int)
4203 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
4206 c.value = control->value;
4207 ret = set_ctrl_lock(fh, ctrl, &c);
4208 control->value = c.value;
4211 EXPORT_SYMBOL(v4l2_s_ctrl);
4213 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
4215 lockdep_assert_held(ctrl->handler->lock);
4217 /* It's a driver bug if this happens. */
4218 WARN_ON(!ctrl->is_int);
4220 return set_ctrl(NULL, ctrl, 0);
4222 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
4224 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
4226 lockdep_assert_held(ctrl->handler->lock);
4228 /* It's a driver bug if this happens. */
4229 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
4230 *ctrl->p_new.p_s64 = val;
4231 return set_ctrl(NULL, ctrl, 0);
4233 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
4235 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
4237 lockdep_assert_held(ctrl->handler->lock);
4239 /* It's a driver bug if this happens. */
4240 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
4241 strscpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
4242 return set_ctrl(NULL, ctrl, 0);
4244 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
4246 int __v4l2_ctrl_s_ctrl_area(struct v4l2_ctrl *ctrl,
4247 const struct v4l2_area *area)
4249 lockdep_assert_held(ctrl->handler->lock);
4251 /* It's a driver bug if this happens. */
4252 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_AREA);
4253 *ctrl->p_new.p_area = *area;
4254 return set_ctrl(NULL, ctrl, 0);
4256 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_area);
4258 void v4l2_ctrl_request_complete(struct media_request *req,
4259 struct v4l2_ctrl_handler *main_hdl)
4261 struct media_request_object *obj;
4262 struct v4l2_ctrl_handler *hdl;
4263 struct v4l2_ctrl_ref *ref;
4265 if (!req || !main_hdl)
4269 * Note that it is valid if nothing was found. It means
4270 * that this request doesn't have any controls and so just
4271 * wants to leave the controls unchanged.
4273 obj = media_request_object_find(req, &req_ops, main_hdl);
4276 hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
4278 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
4279 struct v4l2_ctrl *ctrl = ref->ctrl;
4280 struct v4l2_ctrl *master = ctrl->cluster[0];
4283 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
4286 v4l2_ctrl_lock(master);
4287 /* g_volatile_ctrl will update the current control values */
4288 for (i = 0; i < master->ncontrols; i++)
4289 cur_to_new(master->cluster[i]);
4290 call_op(master, g_volatile_ctrl);
4292 v4l2_ctrl_unlock(master);
4295 if (ref->req == ref)
4298 v4l2_ctrl_lock(ctrl);
4300 ptr_to_ptr(ctrl, ref->req->p_req, ref->p_req);
4302 ptr_to_ptr(ctrl, ctrl->p_cur, ref->p_req);
4303 v4l2_ctrl_unlock(ctrl);
4306 mutex_lock(main_hdl->lock);
4307 WARN_ON(!hdl->request_is_queued);
4308 list_del_init(&hdl->requests_queued);
4309 hdl->request_is_queued = false;
4310 mutex_unlock(main_hdl->lock);
4311 media_request_object_complete(obj);
4312 media_request_object_put(obj);
4314 EXPORT_SYMBOL(v4l2_ctrl_request_complete);
4316 int v4l2_ctrl_request_setup(struct media_request *req,
4317 struct v4l2_ctrl_handler *main_hdl)
4319 struct media_request_object *obj;
4320 struct v4l2_ctrl_handler *hdl;
4321 struct v4l2_ctrl_ref *ref;
4324 if (!req || !main_hdl)
4327 if (WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED))
4331 * Note that it is valid if nothing was found. It means
4332 * that this request doesn't have any controls and so just
4333 * wants to leave the controls unchanged.
4335 obj = media_request_object_find(req, &req_ops, main_hdl);
4338 if (obj->completed) {
4339 media_request_object_put(obj);
4342 hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
4344 list_for_each_entry(ref, &hdl->ctrl_refs, node)
4345 ref->req_done = false;
4347 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
4348 struct v4l2_ctrl *ctrl = ref->ctrl;
4349 struct v4l2_ctrl *master = ctrl->cluster[0];
4350 bool have_new_data = false;
4354 * Skip if this control was already handled by a cluster.
4355 * Skip button controls and read-only controls.
4357 if (ref->req_done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
4358 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
4361 v4l2_ctrl_lock(master);
4362 for (i = 0; i < master->ncontrols; i++) {
4363 if (master->cluster[i]) {
4364 struct v4l2_ctrl_ref *r =
4365 find_ref(hdl, master->cluster[i]->id);
4367 if (r->req && r == r->req) {
4368 have_new_data = true;
4373 if (!have_new_data) {
4374 v4l2_ctrl_unlock(master);
4378 for (i = 0; i < master->ncontrols; i++) {
4379 if (master->cluster[i]) {
4380 struct v4l2_ctrl_ref *r =
4381 find_ref(hdl, master->cluster[i]->id);
4384 master->cluster[i]->is_new = 1;
4389 * For volatile autoclusters that are currently in auto mode
4390 * we need to discover if it will be set to manual mode.
4391 * If so, then we have to copy the current volatile values
4392 * first since those will become the new manual values (which
4393 * may be overwritten by explicit new values from this set
4396 if (master->is_auto && master->has_volatiles &&
4397 !is_cur_manual(master)) {
4398 s32 new_auto_val = *master->p_new.p_s32;
4401 * If the new value == the manual value, then copy
4402 * the current volatile values.
4404 if (new_auto_val == master->manual_mode_value)
4405 update_from_auto_cluster(master);
4408 ret = try_or_set_cluster(NULL, master, true, 0);
4409 v4l2_ctrl_unlock(master);
4415 media_request_object_put(obj);
4418 EXPORT_SYMBOL(v4l2_ctrl_request_setup);
4420 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
4424 if (notify == NULL) {
4425 ctrl->call_notify = 0;
4428 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
4430 ctrl->handler->notify = notify;
4431 ctrl->handler->notify_priv = priv;
4432 ctrl->call_notify = 1;
4434 EXPORT_SYMBOL(v4l2_ctrl_notify);
4436 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
4437 s64 min, s64 max, u64 step, s64 def)
4440 bool range_changed = false;
4443 lockdep_assert_held(ctrl->handler->lock);
4445 switch (ctrl->type) {
4446 case V4L2_CTRL_TYPE_INTEGER:
4447 case V4L2_CTRL_TYPE_INTEGER64:
4448 case V4L2_CTRL_TYPE_BOOLEAN:
4449 case V4L2_CTRL_TYPE_MENU:
4450 case V4L2_CTRL_TYPE_INTEGER_MENU:
4451 case V4L2_CTRL_TYPE_BITMASK:
4452 case V4L2_CTRL_TYPE_U8:
4453 case V4L2_CTRL_TYPE_U16:
4454 case V4L2_CTRL_TYPE_U32:
4457 ret = check_range(ctrl->type, min, max, step, def);
4464 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
4465 (ctrl->step != step) || ctrl->default_value != def) {
4466 range_changed = true;
4467 ctrl->minimum = min;
4468 ctrl->maximum = max;
4470 ctrl->default_value = def;
4473 if (validate_new(ctrl, ctrl->p_new)) {
4474 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4475 *ctrl->p_new.p_s64 = def;
4477 *ctrl->p_new.p_s32 = def;
4480 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4481 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
4483 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
4485 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4486 else if (range_changed)
4487 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4490 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
4492 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
4494 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4499 v4l2_ctrl_lock(ctrl);
4500 list_add_tail(&sev->node, &ctrl->ev_subs);
4501 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
4502 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
4503 struct v4l2_event ev;
4504 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
4506 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
4507 changes |= V4L2_EVENT_CTRL_CH_VALUE;
4508 fill_event(&ev, ctrl, changes);
4509 /* Mark the queue as active, allowing this initial
4510 event to be accepted. */
4512 v4l2_event_queue_fh(sev->fh, &ev);
4514 v4l2_ctrl_unlock(ctrl);
4518 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
4520 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4525 v4l2_ctrl_lock(ctrl);
4526 list_del(&sev->node);
4527 v4l2_ctrl_unlock(ctrl);
4530 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
4532 u32 old_changes = old->u.ctrl.changes;
4534 old->u.ctrl = new->u.ctrl;
4535 old->u.ctrl.changes |= old_changes;
4537 EXPORT_SYMBOL(v4l2_ctrl_replace);
4539 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
4541 new->u.ctrl.changes |= old->u.ctrl.changes;
4543 EXPORT_SYMBOL(v4l2_ctrl_merge);
4545 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
4546 .add = v4l2_ctrl_add_event,
4547 .del = v4l2_ctrl_del_event,
4548 .replace = v4l2_ctrl_replace,
4549 .merge = v4l2_ctrl_merge,
4551 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
4553 int v4l2_ctrl_log_status(struct file *file, void *fh)
4555 struct video_device *vfd = video_devdata(file);
4556 struct v4l2_fh *vfh = file->private_data;
4558 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
4559 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
4560 vfd->v4l2_dev->name);
4563 EXPORT_SYMBOL(v4l2_ctrl_log_status);
4565 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
4566 const struct v4l2_event_subscription *sub)
4568 if (sub->type == V4L2_EVENT_CTRL)
4569 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
4572 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
4574 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
4575 struct v4l2_event_subscription *sub)
4577 if (!sd->ctrl_handler)
4579 return v4l2_ctrl_subscribe_event(fh, sub);
4581 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
4583 __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
4585 struct v4l2_fh *fh = file->private_data;
4587 poll_wait(file, &fh->wait, wait);
4588 if (v4l2_event_pending(fh))
4592 EXPORT_SYMBOL(v4l2_ctrl_poll);