2 V4L2 controls framework implementation.
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <linux/ctype.h>
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-event.h>
28 #include <media/v4l2-dev.h>
30 #define has_op(master, op) \
31 (master->ops && master->ops->op)
32 #define call_op(master, op) \
33 (has_op(master, op) ? master->ops->op(master) : 0)
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl *ctrl;
41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
46 /* Small helper function to determine if the autocluster is set to manual
48 static bool is_cur_manual(const struct v4l2_ctrl *master)
50 return master->is_auto && master->cur.val == master->manual_mode_value;
53 /* Same as above, but this checks the against the new value instead of the
55 static bool is_new_manual(const struct v4l2_ctrl *master)
57 return master->is_auto && master->val == master->manual_mode_value;
60 /* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
64 const char * const *v4l2_ctrl_get_menu(u32 id)
66 static const char * const mpeg_audio_sampling_freq[] = {
72 static const char * const mpeg_audio_encoding[] = {
80 static const char * const mpeg_audio_l1_bitrate[] = {
97 static const char * const mpeg_audio_l2_bitrate[] = {
114 static const char * const mpeg_audio_l3_bitrate[] = {
131 static const char * const mpeg_audio_ac3_bitrate[] = {
153 static const char * const mpeg_audio_mode[] = {
160 static const char * const mpeg_audio_mode_extension[] = {
167 static const char * const mpeg_audio_emphasis[] = {
173 static const char * const mpeg_audio_crc[] = {
178 static const char * const mpeg_audio_dec_playback[] = {
187 static const char * const mpeg_video_encoding[] = {
193 static const char * const mpeg_video_aspect[] = {
200 static const char * const mpeg_video_bitrate_mode[] = {
205 static const char * const mpeg_stream_type[] = {
206 "MPEG-2 Program Stream",
207 "MPEG-2 Transport Stream",
208 "MPEG-1 System Stream",
209 "MPEG-2 DVD-compatible Stream",
210 "MPEG-1 VCD-compatible Stream",
211 "MPEG-2 SVCD-compatible Stream",
214 static const char * const mpeg_stream_vbi_fmt[] = {
216 "Private Packet, IVTV Format",
219 static const char * const camera_power_line_frequency[] = {
226 static const char * const camera_exposure_auto[] = {
229 "Shutter Priority Mode",
230 "Aperture Priority Mode",
233 static const char * const camera_exposure_metering[] = {
240 static const char * const camera_auto_focus_range[] = {
247 static const char * const colorfx[] = {
266 static const char * const auto_n_preset_white_balance[] = {
279 static const char * const camera_iso_sensitivity_auto[] = {
284 static const char * const scene_mode[] = {
301 static const char * const tune_emphasis[] = {
307 static const char * const header_mode[] = {
309 "Joined With 1st Frame",
312 static const char * const multi_slice[] = {
318 static const char * const entropy_mode[] = {
323 static const char * const mpeg_h264_level[] = {
342 static const char * const h264_loop_filter[] = {
345 "Disabled at Slice Boundary",
348 static const char * const h264_profile[] = {
350 "Constrained Baseline",
356 "High 444 Predictive",
363 "Scalable High Intra",
368 static const char * const vui_sar_idc[] = {
389 static const char * const h264_fp_arrangement_type[] = {
398 static const char * const h264_fmo_map_type[] = {
399 "Interleaved Slices",
401 "Foreground with Leftover",
408 static const char * const mpeg_mpeg4_level[] = {
419 static const char * const mpeg4_profile[] = {
424 "Advanced Coding Efficiency",
428 static const char * const vpx_golden_frame_sel[] = {
429 "Use Previous Frame",
430 "Use Previous Specific Frame",
434 static const char * const flash_led_mode[] = {
440 static const char * const flash_strobe_source[] = {
446 static const char * const jpeg_chroma_subsampling[] = {
455 static const char * const dv_tx_mode[] = {
460 static const char * const dv_rgb_range[] = {
462 "RGB limited range (16-235)",
463 "RGB full range (0-255)",
466 static const char * const dv_it_content_type[] = {
474 static const char * const detect_md_mode[] = {
484 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
485 return mpeg_audio_sampling_freq;
486 case V4L2_CID_MPEG_AUDIO_ENCODING:
487 return mpeg_audio_encoding;
488 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
489 return mpeg_audio_l1_bitrate;
490 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
491 return mpeg_audio_l2_bitrate;
492 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
493 return mpeg_audio_l3_bitrate;
494 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
495 return mpeg_audio_ac3_bitrate;
496 case V4L2_CID_MPEG_AUDIO_MODE:
497 return mpeg_audio_mode;
498 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
499 return mpeg_audio_mode_extension;
500 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
501 return mpeg_audio_emphasis;
502 case V4L2_CID_MPEG_AUDIO_CRC:
503 return mpeg_audio_crc;
504 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
505 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
506 return mpeg_audio_dec_playback;
507 case V4L2_CID_MPEG_VIDEO_ENCODING:
508 return mpeg_video_encoding;
509 case V4L2_CID_MPEG_VIDEO_ASPECT:
510 return mpeg_video_aspect;
511 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
512 return mpeg_video_bitrate_mode;
513 case V4L2_CID_MPEG_STREAM_TYPE:
514 return mpeg_stream_type;
515 case V4L2_CID_MPEG_STREAM_VBI_FMT:
516 return mpeg_stream_vbi_fmt;
517 case V4L2_CID_POWER_LINE_FREQUENCY:
518 return camera_power_line_frequency;
519 case V4L2_CID_EXPOSURE_AUTO:
520 return camera_exposure_auto;
521 case V4L2_CID_EXPOSURE_METERING:
522 return camera_exposure_metering;
523 case V4L2_CID_AUTO_FOCUS_RANGE:
524 return camera_auto_focus_range;
525 case V4L2_CID_COLORFX:
527 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
528 return auto_n_preset_white_balance;
529 case V4L2_CID_ISO_SENSITIVITY_AUTO:
530 return camera_iso_sensitivity_auto;
531 case V4L2_CID_SCENE_MODE:
533 case V4L2_CID_TUNE_PREEMPHASIS:
534 return tune_emphasis;
535 case V4L2_CID_TUNE_DEEMPHASIS:
536 return tune_emphasis;
537 case V4L2_CID_FLASH_LED_MODE:
538 return flash_led_mode;
539 case V4L2_CID_FLASH_STROBE_SOURCE:
540 return flash_strobe_source;
541 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
543 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
545 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
547 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
548 return mpeg_h264_level;
549 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
550 return h264_loop_filter;
551 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
553 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
555 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
556 return h264_fp_arrangement_type;
557 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
558 return h264_fmo_map_type;
559 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
560 return mpeg_mpeg4_level;
561 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
562 return mpeg4_profile;
563 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
564 return vpx_golden_frame_sel;
565 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
566 return jpeg_chroma_subsampling;
567 case V4L2_CID_DV_TX_MODE:
569 case V4L2_CID_DV_TX_RGB_RANGE:
570 case V4L2_CID_DV_RX_RGB_RANGE:
572 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
573 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
574 return dv_it_content_type;
575 case V4L2_CID_DETECT_MD_MODE:
576 return detect_md_mode;
582 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
584 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
586 * Returns NULL or an s64 type array containing the menu for given
587 * control ID. The total number of the menu items is returned in @len.
589 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
591 static const s64 qmenu_int_vpx_num_partitions[] = {
595 static const s64 qmenu_int_vpx_num_ref_frames[] = {
600 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
601 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
602 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
603 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
609 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
611 /* Return the control name. */
612 const char *v4l2_ctrl_get_name(u32 id)
616 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
617 case V4L2_CID_USER_CLASS: return "User Controls";
618 case V4L2_CID_BRIGHTNESS: return "Brightness";
619 case V4L2_CID_CONTRAST: return "Contrast";
620 case V4L2_CID_SATURATION: return "Saturation";
621 case V4L2_CID_HUE: return "Hue";
622 case V4L2_CID_AUDIO_VOLUME: return "Volume";
623 case V4L2_CID_AUDIO_BALANCE: return "Balance";
624 case V4L2_CID_AUDIO_BASS: return "Bass";
625 case V4L2_CID_AUDIO_TREBLE: return "Treble";
626 case V4L2_CID_AUDIO_MUTE: return "Mute";
627 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
628 case V4L2_CID_BLACK_LEVEL: return "Black Level";
629 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
630 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
631 case V4L2_CID_RED_BALANCE: return "Red Balance";
632 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
633 case V4L2_CID_GAMMA: return "Gamma";
634 case V4L2_CID_EXPOSURE: return "Exposure";
635 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
636 case V4L2_CID_GAIN: return "Gain";
637 case V4L2_CID_HFLIP: return "Horizontal Flip";
638 case V4L2_CID_VFLIP: return "Vertical Flip";
639 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
640 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
641 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
642 case V4L2_CID_SHARPNESS: return "Sharpness";
643 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
644 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
645 case V4L2_CID_COLOR_KILLER: return "Color Killer";
646 case V4L2_CID_COLORFX: return "Color Effects";
647 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
648 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
649 case V4L2_CID_ROTATE: return "Rotate";
650 case V4L2_CID_BG_COLOR: return "Background Color";
651 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
652 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
653 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
654 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
655 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
656 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
657 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
660 /* The MPEG controls are applicable to all codec controls
661 * and the 'MPEG' part of the define is historical */
662 /* Keep the order of the 'case's the same as in videodev2.h! */
663 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
664 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
665 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
666 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
667 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
668 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
669 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
670 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
671 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
672 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
673 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
674 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
675 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
676 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
677 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
678 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
679 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
680 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
681 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
682 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
683 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
684 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
685 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
686 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
687 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
688 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
689 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
690 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
691 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
692 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
693 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
694 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
695 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
696 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
697 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
698 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
699 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
700 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
701 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
702 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
703 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
704 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
705 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
706 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
707 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
708 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
709 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
710 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
711 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
712 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
713 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
714 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
715 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
716 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
717 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
718 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
719 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
720 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
721 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
722 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
723 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
724 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
725 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
726 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
727 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
728 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
729 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
730 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
731 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
732 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
733 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
734 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
735 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
736 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
737 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
738 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
739 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
740 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
741 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
742 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
743 return "H264 Set QP Value for HC Layers";
744 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
745 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
746 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
747 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
748 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
749 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
750 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
751 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
752 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
753 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
754 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
755 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
756 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
757 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
758 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
759 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
760 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
761 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
762 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
765 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
766 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
767 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
768 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
769 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
770 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
771 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
772 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
773 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
774 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
775 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
776 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
778 /* CAMERA controls */
779 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
780 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
781 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
782 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
783 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
784 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
785 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
786 case V4L2_CID_PAN_RESET: return "Pan, Reset";
787 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
788 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
789 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
790 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
791 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
792 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
793 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
794 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
795 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
796 case V4L2_CID_PRIVACY: return "Privacy";
797 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
798 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
799 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
800 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
801 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
802 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
803 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
804 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
805 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
806 case V4L2_CID_SCENE_MODE: return "Scene Mode";
807 case V4L2_CID_3A_LOCK: return "3A Lock";
808 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
809 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
810 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
811 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
812 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
813 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
815 /* FM Radio Modulator controls */
816 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
817 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
818 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
819 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
820 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
821 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
822 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
823 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
824 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
825 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
826 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
827 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
828 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
829 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
830 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
831 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
832 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
833 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
834 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
835 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
836 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
837 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
838 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
839 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
840 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
841 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
842 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
843 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
844 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
845 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
848 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
849 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
850 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
851 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
852 case V4L2_CID_FLASH_STROBE: return "Strobe";
853 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
854 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
855 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
856 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
857 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
858 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
859 case V4L2_CID_FLASH_FAULT: return "Faults";
860 case V4L2_CID_FLASH_CHARGE: return "Charge";
861 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
863 /* JPEG encoder controls */
864 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
865 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
866 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
867 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
868 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
869 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
871 /* Image source controls */
872 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
873 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
874 case V4L2_CID_VBLANK: return "Vertical Blanking";
875 case V4L2_CID_HBLANK: return "Horizontal Blanking";
876 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
877 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
878 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
879 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
880 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
882 /* Image processing controls */
883 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
884 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
885 case V4L2_CID_LINK_FREQ: return "Link Frequency";
886 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
887 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
890 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
891 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
892 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
893 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
894 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
895 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
896 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
897 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
898 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
899 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
900 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
902 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
903 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
904 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
905 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
906 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
907 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
908 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
909 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
910 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
911 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
912 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
913 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
914 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
915 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
916 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
917 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
918 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
919 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
920 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
921 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
923 /* Detection controls */
924 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
925 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
926 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
927 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
928 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
929 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
934 EXPORT_SYMBOL(v4l2_ctrl_get_name);
936 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
937 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
939 *name = v4l2_ctrl_get_name(id);
943 case V4L2_CID_AUDIO_MUTE:
944 case V4L2_CID_AUDIO_LOUDNESS:
945 case V4L2_CID_AUTO_WHITE_BALANCE:
946 case V4L2_CID_AUTOGAIN:
949 case V4L2_CID_HUE_AUTO:
950 case V4L2_CID_CHROMA_AGC:
951 case V4L2_CID_COLOR_KILLER:
952 case V4L2_CID_AUTOBRIGHTNESS:
953 case V4L2_CID_MPEG_AUDIO_MUTE:
954 case V4L2_CID_MPEG_VIDEO_MUTE:
955 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
956 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
957 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
958 case V4L2_CID_FOCUS_AUTO:
959 case V4L2_CID_PRIVACY:
960 case V4L2_CID_AUDIO_LIMITER_ENABLED:
961 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
962 case V4L2_CID_PILOT_TONE_ENABLED:
963 case V4L2_CID_ILLUMINATORS_1:
964 case V4L2_CID_ILLUMINATORS_2:
965 case V4L2_CID_FLASH_STROBE_STATUS:
966 case V4L2_CID_FLASH_CHARGE:
967 case V4L2_CID_FLASH_READY:
968 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
969 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
970 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
971 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
972 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
973 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
974 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
975 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
976 case V4L2_CID_WIDE_DYNAMIC_RANGE:
977 case V4L2_CID_IMAGE_STABILIZATION:
978 case V4L2_CID_RDS_RECEPTION:
979 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
980 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
981 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
982 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
983 case V4L2_CID_RF_TUNER_PLL_LOCK:
984 case V4L2_CID_RDS_TX_MONO_STEREO:
985 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
986 case V4L2_CID_RDS_TX_COMPRESSED:
987 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
988 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
989 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
990 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
991 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
992 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
993 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
994 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
995 *type = V4L2_CTRL_TYPE_BOOLEAN;
999 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1000 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1001 *type = V4L2_CTRL_TYPE_INTEGER;
1003 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1004 case V4L2_CID_PAN_RESET:
1005 case V4L2_CID_TILT_RESET:
1006 case V4L2_CID_FLASH_STROBE:
1007 case V4L2_CID_FLASH_STROBE_STOP:
1008 case V4L2_CID_AUTO_FOCUS_START:
1009 case V4L2_CID_AUTO_FOCUS_STOP:
1010 case V4L2_CID_DO_WHITE_BALANCE:
1011 *type = V4L2_CTRL_TYPE_BUTTON;
1012 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1013 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1014 *min = *max = *step = *def = 0;
1016 case V4L2_CID_POWER_LINE_FREQUENCY:
1017 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1018 case V4L2_CID_MPEG_AUDIO_ENCODING:
1019 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1020 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1021 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1022 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1023 case V4L2_CID_MPEG_AUDIO_MODE:
1024 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1025 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1026 case V4L2_CID_MPEG_AUDIO_CRC:
1027 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1028 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1029 case V4L2_CID_MPEG_VIDEO_ENCODING:
1030 case V4L2_CID_MPEG_VIDEO_ASPECT:
1031 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1032 case V4L2_CID_MPEG_STREAM_TYPE:
1033 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1034 case V4L2_CID_EXPOSURE_AUTO:
1035 case V4L2_CID_AUTO_FOCUS_RANGE:
1036 case V4L2_CID_COLORFX:
1037 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1038 case V4L2_CID_TUNE_PREEMPHASIS:
1039 case V4L2_CID_FLASH_LED_MODE:
1040 case V4L2_CID_FLASH_STROBE_SOURCE:
1041 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1042 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1043 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1044 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1045 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1046 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1047 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1048 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1049 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1050 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1051 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1052 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1053 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1054 case V4L2_CID_EXPOSURE_METERING:
1055 case V4L2_CID_SCENE_MODE:
1056 case V4L2_CID_DV_TX_MODE:
1057 case V4L2_CID_DV_TX_RGB_RANGE:
1058 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1059 case V4L2_CID_DV_RX_RGB_RANGE:
1060 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1061 case V4L2_CID_TEST_PATTERN:
1062 case V4L2_CID_TUNE_DEEMPHASIS:
1063 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1064 case V4L2_CID_DETECT_MD_MODE:
1065 *type = V4L2_CTRL_TYPE_MENU;
1067 case V4L2_CID_LINK_FREQ:
1068 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1070 case V4L2_CID_RDS_TX_PS_NAME:
1071 case V4L2_CID_RDS_TX_RADIO_TEXT:
1072 case V4L2_CID_RDS_RX_PS_NAME:
1073 case V4L2_CID_RDS_RX_RADIO_TEXT:
1074 *type = V4L2_CTRL_TYPE_STRING;
1076 case V4L2_CID_ISO_SENSITIVITY:
1077 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1078 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1079 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1080 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1082 case V4L2_CID_USER_CLASS:
1083 case V4L2_CID_CAMERA_CLASS:
1084 case V4L2_CID_MPEG_CLASS:
1085 case V4L2_CID_FM_TX_CLASS:
1086 case V4L2_CID_FLASH_CLASS:
1087 case V4L2_CID_JPEG_CLASS:
1088 case V4L2_CID_IMAGE_SOURCE_CLASS:
1089 case V4L2_CID_IMAGE_PROC_CLASS:
1090 case V4L2_CID_DV_CLASS:
1091 case V4L2_CID_FM_RX_CLASS:
1092 case V4L2_CID_RF_TUNER_CLASS:
1093 case V4L2_CID_DETECT_CLASS:
1094 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1095 /* You can neither read not write these */
1096 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1097 *min = *max = *step = *def = 0;
1099 case V4L2_CID_BG_COLOR:
1100 *type = V4L2_CTRL_TYPE_INTEGER;
1103 /* Max is calculated as RGB888 that is 2^24 */
1106 case V4L2_CID_FLASH_FAULT:
1107 case V4L2_CID_JPEG_ACTIVE_MARKER:
1108 case V4L2_CID_3A_LOCK:
1109 case V4L2_CID_AUTO_FOCUS_STATUS:
1110 case V4L2_CID_DV_TX_HOTPLUG:
1111 case V4L2_CID_DV_TX_RXSENSE:
1112 case V4L2_CID_DV_TX_EDID_PRESENT:
1113 case V4L2_CID_DV_RX_POWER_PRESENT:
1114 *type = V4L2_CTRL_TYPE_BITMASK;
1116 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1117 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1118 *type = V4L2_CTRL_TYPE_INTEGER;
1119 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1121 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1122 *type = V4L2_CTRL_TYPE_INTEGER64;
1123 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1125 *max = 0x1ffffffffLL;
1128 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1129 *type = V4L2_CTRL_TYPE_INTEGER64;
1130 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1132 *max = 0x7fffffffffffffffLL;
1135 case V4L2_CID_PIXEL_RATE:
1136 *type = V4L2_CTRL_TYPE_INTEGER64;
1137 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1139 case V4L2_CID_DETECT_MD_REGION_GRID:
1140 *type = V4L2_CTRL_TYPE_U8;
1142 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1143 *type = V4L2_CTRL_TYPE_U16;
1145 case V4L2_CID_RDS_TX_ALT_FREQS:
1146 *type = V4L2_CTRL_TYPE_U32;
1149 *type = V4L2_CTRL_TYPE_INTEGER;
1153 case V4L2_CID_MPEG_AUDIO_ENCODING:
1154 case V4L2_CID_MPEG_AUDIO_MODE:
1155 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1156 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1157 case V4L2_CID_MPEG_STREAM_TYPE:
1158 *flags |= V4L2_CTRL_FLAG_UPDATE;
1160 case V4L2_CID_AUDIO_VOLUME:
1161 case V4L2_CID_AUDIO_BALANCE:
1162 case V4L2_CID_AUDIO_BASS:
1163 case V4L2_CID_AUDIO_TREBLE:
1164 case V4L2_CID_BRIGHTNESS:
1165 case V4L2_CID_CONTRAST:
1166 case V4L2_CID_SATURATION:
1168 case V4L2_CID_RED_BALANCE:
1169 case V4L2_CID_BLUE_BALANCE:
1170 case V4L2_CID_GAMMA:
1171 case V4L2_CID_SHARPNESS:
1172 case V4L2_CID_CHROMA_GAIN:
1173 case V4L2_CID_RDS_TX_DEVIATION:
1174 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1175 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1176 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1177 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1178 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1179 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1180 case V4L2_CID_PILOT_TONE_DEVIATION:
1181 case V4L2_CID_PILOT_TONE_FREQUENCY:
1182 case V4L2_CID_TUNE_POWER_LEVEL:
1183 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1184 case V4L2_CID_RF_TUNER_RF_GAIN:
1185 case V4L2_CID_RF_TUNER_LNA_GAIN:
1186 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1187 case V4L2_CID_RF_TUNER_IF_GAIN:
1188 case V4L2_CID_RF_TUNER_BANDWIDTH:
1189 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1190 *flags |= V4L2_CTRL_FLAG_SLIDER;
1192 case V4L2_CID_PAN_RELATIVE:
1193 case V4L2_CID_TILT_RELATIVE:
1194 case V4L2_CID_FOCUS_RELATIVE:
1195 case V4L2_CID_IRIS_RELATIVE:
1196 case V4L2_CID_ZOOM_RELATIVE:
1197 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1198 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1200 case V4L2_CID_FLASH_STROBE_STATUS:
1201 case V4L2_CID_AUTO_FOCUS_STATUS:
1202 case V4L2_CID_FLASH_READY:
1203 case V4L2_CID_DV_TX_HOTPLUG:
1204 case V4L2_CID_DV_TX_RXSENSE:
1205 case V4L2_CID_DV_TX_EDID_PRESENT:
1206 case V4L2_CID_DV_RX_POWER_PRESENT:
1207 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1208 case V4L2_CID_RDS_RX_PTY:
1209 case V4L2_CID_RDS_RX_PS_NAME:
1210 case V4L2_CID_RDS_RX_RADIO_TEXT:
1211 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1212 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1213 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1214 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1216 case V4L2_CID_RF_TUNER_PLL_LOCK:
1217 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1221 EXPORT_SYMBOL(v4l2_ctrl_fill);
1223 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1225 u32 flags = ctrl->flags;
1228 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1233 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1235 memset(ev, 0, sizeof(*ev));
1236 ev->type = V4L2_EVENT_CTRL;
1238 ev->u.ctrl.changes = changes;
1239 ev->u.ctrl.type = ctrl->type;
1240 ev->u.ctrl.flags = user_flags(ctrl);
1242 ev->u.ctrl.value64 = 0;
1244 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1245 ev->u.ctrl.minimum = ctrl->minimum;
1246 ev->u.ctrl.maximum = ctrl->maximum;
1247 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1248 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1249 ev->u.ctrl.step = 1;
1251 ev->u.ctrl.step = ctrl->step;
1252 ev->u.ctrl.default_value = ctrl->default_value;
1255 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1257 struct v4l2_event ev;
1258 struct v4l2_subscribed_event *sev;
1260 if (list_empty(&ctrl->ev_subs))
1262 fill_event(&ev, ctrl, changes);
1264 list_for_each_entry(sev, &ctrl->ev_subs, node)
1265 if (sev->fh != fh ||
1266 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1267 v4l2_event_queue_fh(sev->fh, &ev);
1270 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1271 union v4l2_ctrl_ptr ptr1,
1272 union v4l2_ctrl_ptr ptr2)
1274 switch (ctrl->type) {
1275 case V4L2_CTRL_TYPE_BUTTON:
1277 case V4L2_CTRL_TYPE_STRING:
1278 idx *= ctrl->elem_size;
1279 /* strings are always 0-terminated */
1280 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1281 case V4L2_CTRL_TYPE_INTEGER64:
1282 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1283 case V4L2_CTRL_TYPE_U8:
1284 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1285 case V4L2_CTRL_TYPE_U16:
1286 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1287 case V4L2_CTRL_TYPE_U32:
1288 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1291 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1292 idx *= ctrl->elem_size;
1293 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1297 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1298 union v4l2_ctrl_ptr ptr)
1300 switch (ctrl->type) {
1301 case V4L2_CTRL_TYPE_STRING:
1302 idx *= ctrl->elem_size;
1303 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1304 ptr.p_char[idx + ctrl->minimum] = '\0';
1306 case V4L2_CTRL_TYPE_INTEGER64:
1307 ptr.p_s64[idx] = ctrl->default_value;
1309 case V4L2_CTRL_TYPE_INTEGER:
1310 case V4L2_CTRL_TYPE_INTEGER_MENU:
1311 case V4L2_CTRL_TYPE_MENU:
1312 case V4L2_CTRL_TYPE_BITMASK:
1313 case V4L2_CTRL_TYPE_BOOLEAN:
1314 ptr.p_s32[idx] = ctrl->default_value;
1316 case V4L2_CTRL_TYPE_U8:
1317 ptr.p_u8[idx] = ctrl->default_value;
1319 case V4L2_CTRL_TYPE_U16:
1320 ptr.p_u16[idx] = ctrl->default_value;
1322 case V4L2_CTRL_TYPE_U32:
1323 ptr.p_u32[idx] = ctrl->default_value;
1326 idx *= ctrl->elem_size;
1327 memset(ptr.p + idx, 0, ctrl->elem_size);
1332 static void std_log(const struct v4l2_ctrl *ctrl)
1334 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1336 if (ctrl->is_array) {
1339 for (i = 0; i < ctrl->nr_of_dims; i++)
1340 pr_cont("[%u]", ctrl->dims[i]);
1344 switch (ctrl->type) {
1345 case V4L2_CTRL_TYPE_INTEGER:
1346 pr_cont("%d", *ptr.p_s32);
1348 case V4L2_CTRL_TYPE_BOOLEAN:
1349 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1351 case V4L2_CTRL_TYPE_MENU:
1352 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1354 case V4L2_CTRL_TYPE_INTEGER_MENU:
1355 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1357 case V4L2_CTRL_TYPE_BITMASK:
1358 pr_cont("0x%08x", *ptr.p_s32);
1360 case V4L2_CTRL_TYPE_INTEGER64:
1361 pr_cont("%lld", *ptr.p_s64);
1363 case V4L2_CTRL_TYPE_STRING:
1364 pr_cont("%s", ptr.p_char);
1366 case V4L2_CTRL_TYPE_U8:
1367 pr_cont("%u", (unsigned)*ptr.p_u8);
1369 case V4L2_CTRL_TYPE_U16:
1370 pr_cont("%u", (unsigned)*ptr.p_u16);
1372 case V4L2_CTRL_TYPE_U32:
1373 pr_cont("%u", (unsigned)*ptr.p_u32);
1376 pr_cont("unknown type %d", ctrl->type);
1382 * Round towards the closest legal value. Be careful when we are
1383 * close to the maximum range of the control type to prevent
1386 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1388 offset_type offset; \
1389 if ((ctrl)->maximum >= 0 && \
1390 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1391 val = (ctrl)->maximum; \
1393 val += (s32)((ctrl)->step / 2); \
1394 val = clamp_t(typeof(val), val, \
1395 (ctrl)->minimum, (ctrl)->maximum); \
1396 offset = (val) - (ctrl)->minimum; \
1397 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1398 val = (ctrl)->minimum + offset; \
1402 /* Validate a new control */
1403 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1404 union v4l2_ctrl_ptr ptr)
1410 switch (ctrl->type) {
1411 case V4L2_CTRL_TYPE_INTEGER:
1412 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1413 case V4L2_CTRL_TYPE_INTEGER64:
1415 * We can't use the ROUND_TO_RANGE define here due to
1416 * the u64 divide that needs special care.
1418 val = ptr.p_s64[idx];
1419 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1420 val = ctrl->maximum;
1422 val += (s64)(ctrl->step / 2);
1423 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1424 offset = val - ctrl->minimum;
1425 do_div(offset, ctrl->step);
1426 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1428 case V4L2_CTRL_TYPE_U8:
1429 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1430 case V4L2_CTRL_TYPE_U16:
1431 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1432 case V4L2_CTRL_TYPE_U32:
1433 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1435 case V4L2_CTRL_TYPE_BOOLEAN:
1436 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1439 case V4L2_CTRL_TYPE_MENU:
1440 case V4L2_CTRL_TYPE_INTEGER_MENU:
1441 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1443 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1445 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1446 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1450 case V4L2_CTRL_TYPE_BITMASK:
1451 ptr.p_s32[idx] &= ctrl->maximum;
1454 case V4L2_CTRL_TYPE_BUTTON:
1455 case V4L2_CTRL_TYPE_CTRL_CLASS:
1459 case V4L2_CTRL_TYPE_STRING:
1460 idx *= ctrl->elem_size;
1461 len = strlen(ptr.p_char + idx);
1462 if (len < ctrl->minimum)
1464 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1473 static const struct v4l2_ctrl_type_ops std_type_ops = {
1477 .validate = std_validate,
1480 /* Helper function: copy the given control value back to the caller */
1481 static int ptr_to_user(struct v4l2_ext_control *c,
1482 struct v4l2_ctrl *ctrl,
1483 union v4l2_ctrl_ptr ptr)
1487 if (ctrl->is_ptr && !ctrl->is_string)
1488 return copy_to_user(c->ptr, ptr.p, c->size) ?
1491 switch (ctrl->type) {
1492 case V4L2_CTRL_TYPE_STRING:
1493 len = strlen(ptr.p_char);
1494 if (c->size < len + 1) {
1495 c->size = ctrl->elem_size;
1498 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1500 case V4L2_CTRL_TYPE_INTEGER64:
1501 c->value64 = *ptr.p_s64;
1504 c->value = *ptr.p_s32;
1510 /* Helper function: copy the current control value back to the caller */
1511 static int cur_to_user(struct v4l2_ext_control *c,
1512 struct v4l2_ctrl *ctrl)
1514 return ptr_to_user(c, ctrl, ctrl->p_cur);
1517 /* Helper function: copy the new control value back to the caller */
1518 static int new_to_user(struct v4l2_ext_control *c,
1519 struct v4l2_ctrl *ctrl)
1521 return ptr_to_user(c, ctrl, ctrl->p_new);
1524 /* Helper function: copy the initial control value back to the caller */
1525 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1529 for (idx = 0; idx < ctrl->elems; idx++)
1530 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1532 return ptr_to_user(c, ctrl, ctrl->p_new);
1535 /* Helper function: copy the caller-provider value to the given control value */
1536 static int user_to_ptr(struct v4l2_ext_control *c,
1537 struct v4l2_ctrl *ctrl,
1538 union v4l2_ctrl_ptr ptr)
1544 if (ctrl->is_ptr && !ctrl->is_string) {
1547 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1548 if (ret || !ctrl->is_array)
1550 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1551 ctrl->type_ops->init(ctrl, idx, ptr);
1555 switch (ctrl->type) {
1556 case V4L2_CTRL_TYPE_INTEGER64:
1557 *ptr.p_s64 = c->value64;
1559 case V4L2_CTRL_TYPE_STRING:
1563 if (size > ctrl->maximum + 1)
1564 size = ctrl->maximum + 1;
1565 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1567 char last = ptr.p_char[size - 1];
1569 ptr.p_char[size - 1] = 0;
1570 /* If the string was longer than ctrl->maximum,
1571 then return an error. */
1572 if (strlen(ptr.p_char) == ctrl->maximum && last)
1577 *ptr.p_s32 = c->value;
1583 /* Helper function: copy the caller-provider value as the new control value */
1584 static int user_to_new(struct v4l2_ext_control *c,
1585 struct v4l2_ctrl *ctrl)
1587 return user_to_ptr(c, ctrl, ctrl->p_new);
1590 /* Copy the one value to another. */
1591 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1592 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1596 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1599 /* Copy the new value to the current value. */
1600 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1607 /* has_changed is set by cluster_changed */
1608 changed = ctrl->has_changed;
1610 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1612 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1613 /* Note: CH_FLAGS is only set for auto clusters. */
1615 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1616 if (!is_cur_manual(ctrl->cluster[0])) {
1617 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1618 if (ctrl->cluster[0]->has_volatiles)
1619 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1623 if (changed || ch_flags) {
1624 /* If a control was changed that was not one of the controls
1625 modified by the application, then send the event to all. */
1628 send_event(fh, ctrl,
1629 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1630 if (ctrl->call_notify && changed && ctrl->handler->notify)
1631 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1635 /* Copy the current value to the new value */
1636 static void cur_to_new(struct v4l2_ctrl *ctrl)
1640 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1643 /* Return non-zero if one or more of the controls in the cluster has a new
1644 value that differs from the current value. */
1645 static int cluster_changed(struct v4l2_ctrl *master)
1647 bool changed = false;
1651 for (i = 0; i < master->ncontrols; i++) {
1652 struct v4l2_ctrl *ctrl = master->cluster[i];
1653 bool ctrl_changed = false;
1658 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1659 changed = ctrl_changed = true;
1662 * Set has_changed to false to avoid generating
1663 * the event V4L2_EVENT_CTRL_CH_VALUE
1665 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1666 ctrl->has_changed = false;
1670 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1671 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1672 ctrl->p_cur, ctrl->p_new);
1673 ctrl->has_changed = ctrl_changed;
1674 changed |= ctrl->has_changed;
1679 /* Control range checking */
1680 static int check_range(enum v4l2_ctrl_type type,
1681 s64 min, s64 max, u64 step, s64 def)
1684 case V4L2_CTRL_TYPE_BOOLEAN:
1685 if (step != 1 || max > 1 || min < 0)
1688 case V4L2_CTRL_TYPE_U8:
1689 case V4L2_CTRL_TYPE_U16:
1690 case V4L2_CTRL_TYPE_U32:
1691 case V4L2_CTRL_TYPE_INTEGER:
1692 case V4L2_CTRL_TYPE_INTEGER64:
1693 if (step == 0 || min > max || def < min || def > max)
1696 case V4L2_CTRL_TYPE_BITMASK:
1697 if (step || min || !max || (def & ~max))
1700 case V4L2_CTRL_TYPE_MENU:
1701 case V4L2_CTRL_TYPE_INTEGER_MENU:
1702 if (min > max || def < min || def > max)
1704 /* Note: step == menu_skip_mask for menu controls.
1705 So here we check if the default value is masked out. */
1706 if (step && ((1 << def) & step))
1709 case V4L2_CTRL_TYPE_STRING:
1710 if (min > max || min < 0 || step < 1 || def)
1718 /* Validate a new control */
1719 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1724 for (idx = 0; !err && idx < ctrl->elems; idx++)
1725 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1729 static inline u32 node2id(struct list_head *node)
1731 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1734 /* Set the handler's error code if it wasn't set earlier already */
1735 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1737 if (hdl->error == 0)
1742 /* Initialize the handler */
1743 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1744 unsigned nr_of_controls_hint,
1745 struct lock_class_key *key, const char *name)
1747 hdl->lock = &hdl->_lock;
1748 mutex_init(hdl->lock);
1749 lockdep_set_class_and_name(hdl->lock, key, name);
1750 INIT_LIST_HEAD(&hdl->ctrls);
1751 INIT_LIST_HEAD(&hdl->ctrl_refs);
1752 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1753 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1755 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1758 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1760 /* Free all controls and control refs */
1761 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1763 struct v4l2_ctrl_ref *ref, *next_ref;
1764 struct v4l2_ctrl *ctrl, *next_ctrl;
1765 struct v4l2_subscribed_event *sev, *next_sev;
1767 if (hdl == NULL || hdl->buckets == NULL)
1770 mutex_lock(hdl->lock);
1771 /* Free all nodes */
1772 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1773 list_del(&ref->node);
1776 /* Free all controls owned by the handler */
1777 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1778 list_del(&ctrl->node);
1779 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1780 list_del(&sev->node);
1783 kfree(hdl->buckets);
1784 hdl->buckets = NULL;
1787 mutex_unlock(hdl->lock);
1789 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1791 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1792 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1793 with applications that do not use the NEXT_CTRL flag.
1795 We just find the n-th private user control. It's O(N), but that should not
1796 be an issue in this particular case. */
1797 static struct v4l2_ctrl_ref *find_private_ref(
1798 struct v4l2_ctrl_handler *hdl, u32 id)
1800 struct v4l2_ctrl_ref *ref;
1802 id -= V4L2_CID_PRIVATE_BASE;
1803 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1804 /* Search for private user controls that are compatible with
1806 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1807 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1808 if (!ref->ctrl->is_int)
1818 /* Find a control with the given ID. */
1819 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1821 struct v4l2_ctrl_ref *ref;
1824 id &= V4L2_CTRL_ID_MASK;
1826 /* Old-style private controls need special handling */
1827 if (id >= V4L2_CID_PRIVATE_BASE)
1828 return find_private_ref(hdl, id);
1829 bucket = id % hdl->nr_of_buckets;
1831 /* Simple optimization: cache the last control found */
1832 if (hdl->cached && hdl->cached->ctrl->id == id)
1835 /* Not in cache, search the hash */
1836 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1837 while (ref && ref->ctrl->id != id)
1841 hdl->cached = ref; /* cache it! */
1845 /* Find a control with the given ID. Take the handler's lock first. */
1846 static struct v4l2_ctrl_ref *find_ref_lock(
1847 struct v4l2_ctrl_handler *hdl, u32 id)
1849 struct v4l2_ctrl_ref *ref = NULL;
1852 mutex_lock(hdl->lock);
1853 ref = find_ref(hdl, id);
1854 mutex_unlock(hdl->lock);
1859 /* Find a control with the given ID. */
1860 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1862 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1864 return ref ? ref->ctrl : NULL;
1866 EXPORT_SYMBOL(v4l2_ctrl_find);
1868 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1869 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1870 struct v4l2_ctrl *ctrl)
1872 struct v4l2_ctrl_ref *ref;
1873 struct v4l2_ctrl_ref *new_ref;
1875 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
1876 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1879 * Automatically add the control class if it is not yet present and
1880 * the new control is not a compound control.
1882 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1883 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1884 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1890 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1892 return handler_set_err(hdl, -ENOMEM);
1893 new_ref->ctrl = ctrl;
1894 if (ctrl->handler == hdl) {
1895 /* By default each control starts in a cluster of its own.
1896 new_ref->ctrl is basically a cluster array with one
1897 element, so that's perfect to use as the cluster pointer.
1898 But only do this for the handler that owns the control. */
1899 ctrl->cluster = &new_ref->ctrl;
1900 ctrl->ncontrols = 1;
1903 INIT_LIST_HEAD(&new_ref->node);
1905 mutex_lock(hdl->lock);
1907 /* Add immediately at the end of the list if the list is empty, or if
1908 the last element in the list has a lower ID.
1909 This ensures that when elements are added in ascending order the
1910 insertion is an O(1) operation. */
1911 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1912 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1913 goto insert_in_hash;
1916 /* Find insert position in sorted list */
1917 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1918 if (ref->ctrl->id < id)
1920 /* Don't add duplicates */
1921 if (ref->ctrl->id == id) {
1925 list_add(&new_ref->node, ref->node.prev);
1930 /* Insert the control node in the hash */
1931 new_ref->next = hdl->buckets[bucket];
1932 hdl->buckets[bucket] = new_ref;
1935 mutex_unlock(hdl->lock);
1939 /* Add a new control */
1940 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1941 const struct v4l2_ctrl_ops *ops,
1942 const struct v4l2_ctrl_type_ops *type_ops,
1943 u32 id, const char *name, enum v4l2_ctrl_type type,
1944 s64 min, s64 max, u64 step, s64 def,
1945 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1946 u32 flags, const char * const *qmenu,
1947 const s64 *qmenu_int, void *priv)
1949 struct v4l2_ctrl *ctrl;
1951 unsigned nr_of_dims = 0;
1954 unsigned tot_ctrl_size;
1962 while (dims && dims[nr_of_dims]) {
1963 elems *= dims[nr_of_dims];
1965 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1968 is_array = nr_of_dims > 0;
1970 /* Prefill elem_size for all types handled by std_type_ops */
1972 case V4L2_CTRL_TYPE_INTEGER64:
1973 elem_size = sizeof(s64);
1975 case V4L2_CTRL_TYPE_STRING:
1976 elem_size = max + 1;
1978 case V4L2_CTRL_TYPE_U8:
1979 elem_size = sizeof(u8);
1981 case V4L2_CTRL_TYPE_U16:
1982 elem_size = sizeof(u16);
1984 case V4L2_CTRL_TYPE_U32:
1985 elem_size = sizeof(u32);
1988 if (type < V4L2_CTRL_COMPOUND_TYPES)
1989 elem_size = sizeof(s32);
1992 tot_ctrl_size = elem_size * elems;
1995 if (id == 0 || name == NULL || !elem_size ||
1996 id >= V4L2_CID_PRIVATE_BASE ||
1997 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1998 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1999 handler_set_err(hdl, -ERANGE);
2002 err = check_range(type, min, max, step, def);
2004 handler_set_err(hdl, err);
2007 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
2008 handler_set_err(hdl, -ERANGE);
2012 (type == V4L2_CTRL_TYPE_BUTTON ||
2013 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2014 handler_set_err(hdl, -EINVAL);
2019 if (type == V4L2_CTRL_TYPE_BUTTON)
2020 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2021 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2022 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2023 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2024 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2025 type == V4L2_CTRL_TYPE_STRING ||
2026 type >= V4L2_CTRL_COMPOUND_TYPES ||
2028 sz_extra += 2 * tot_ctrl_size;
2030 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2032 handler_set_err(hdl, -ENOMEM);
2036 INIT_LIST_HEAD(&ctrl->node);
2037 INIT_LIST_HEAD(&ctrl->ev_subs);
2038 ctrl->handler = hdl;
2040 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2044 ctrl->flags = flags;
2045 ctrl->minimum = min;
2046 ctrl->maximum = max;
2048 ctrl->default_value = def;
2049 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2050 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2051 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2052 ctrl->is_array = is_array;
2053 ctrl->elems = elems;
2054 ctrl->nr_of_dims = nr_of_dims;
2056 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2057 ctrl->elem_size = elem_size;
2058 if (type == V4L2_CTRL_TYPE_MENU)
2059 ctrl->qmenu = qmenu;
2060 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2061 ctrl->qmenu_int = qmenu_int;
2063 ctrl->cur.val = ctrl->val = def;
2066 if (!ctrl->is_int) {
2067 ctrl->p_new.p = data;
2068 ctrl->p_cur.p = data + tot_ctrl_size;
2070 ctrl->p_new.p = &ctrl->val;
2071 ctrl->p_cur.p = &ctrl->cur.val;
2073 for (idx = 0; idx < elems; idx++) {
2074 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2075 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2078 if (handler_new_ref(hdl, ctrl)) {
2082 mutex_lock(hdl->lock);
2083 list_add_tail(&ctrl->node, &hdl->ctrls);
2084 mutex_unlock(hdl->lock);
2088 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2089 const struct v4l2_ctrl_config *cfg, void *priv)
2092 struct v4l2_ctrl *ctrl;
2093 const char *name = cfg->name;
2094 const char * const *qmenu = cfg->qmenu;
2095 const s64 *qmenu_int = cfg->qmenu_int;
2096 enum v4l2_ctrl_type type = cfg->type;
2097 u32 flags = cfg->flags;
2100 u64 step = cfg->step;
2104 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2107 is_menu = (type == V4L2_CTRL_TYPE_MENU ||
2108 type == V4L2_CTRL_TYPE_INTEGER_MENU);
2112 WARN_ON(cfg->menu_skip_mask);
2113 if (type == V4L2_CTRL_TYPE_MENU && !qmenu) {
2114 qmenu = v4l2_ctrl_get_menu(cfg->id);
2115 } else if (type == V4L2_CTRL_TYPE_INTEGER_MENU && !qmenu_int) {
2116 handler_set_err(hdl, -EINVAL);
2120 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2122 is_menu ? cfg->menu_skip_mask : step, def,
2123 cfg->dims, cfg->elem_size,
2124 flags, qmenu, qmenu_int, priv);
2126 ctrl->is_private = cfg->is_private;
2129 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2131 /* Helper function for standard non-menu controls */
2132 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2133 const struct v4l2_ctrl_ops *ops,
2134 u32 id, s64 min, s64 max, u64 step, s64 def)
2137 enum v4l2_ctrl_type type;
2140 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2141 if (type == V4L2_CTRL_TYPE_MENU ||
2142 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2143 type >= V4L2_CTRL_COMPOUND_TYPES) {
2144 handler_set_err(hdl, -EINVAL);
2147 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2148 min, max, step, def, NULL, 0,
2149 flags, NULL, NULL, NULL);
2151 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2153 /* Helper function for standard menu controls */
2154 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2155 const struct v4l2_ctrl_ops *ops,
2156 u32 id, u8 _max, u64 mask, u8 _def)
2158 const char * const *qmenu = NULL;
2159 const s64 *qmenu_int = NULL;
2160 unsigned int qmenu_int_len = 0;
2162 enum v4l2_ctrl_type type;
2169 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2171 if (type == V4L2_CTRL_TYPE_MENU)
2172 qmenu = v4l2_ctrl_get_menu(id);
2173 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2174 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2176 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2177 handler_set_err(hdl, -EINVAL);
2180 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2181 0, max, mask, def, NULL, 0,
2182 flags, qmenu, qmenu_int, NULL);
2184 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2186 /* Helper function for standard menu controls with driver defined menu */
2187 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2188 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2189 u64 mask, u8 _def, const char * const *qmenu)
2191 enum v4l2_ctrl_type type;
2199 /* v4l2_ctrl_new_std_menu_items() should only be called for
2200 * standard controls without a standard menu.
2202 if (v4l2_ctrl_get_menu(id)) {
2203 handler_set_err(hdl, -EINVAL);
2207 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2208 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2209 handler_set_err(hdl, -EINVAL);
2212 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2213 0, max, mask, def, NULL, 0,
2214 flags, qmenu, NULL, NULL);
2217 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2219 /* Helper function for standard integer menu controls */
2220 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2221 const struct v4l2_ctrl_ops *ops,
2222 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2225 enum v4l2_ctrl_type type;
2232 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2233 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2234 handler_set_err(hdl, -EINVAL);
2237 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2238 0, max, 0, def, NULL, 0,
2239 flags, NULL, qmenu_int, NULL);
2241 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2243 /* Add the controls from another handler to our own. */
2244 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2245 struct v4l2_ctrl_handler *add,
2246 bool (*filter)(const struct v4l2_ctrl *ctrl))
2248 struct v4l2_ctrl_ref *ref;
2251 /* Do nothing if either handler is NULL or if they are the same */
2252 if (!hdl || !add || hdl == add)
2256 mutex_lock(add->lock);
2257 list_for_each_entry(ref, &add->ctrl_refs, node) {
2258 struct v4l2_ctrl *ctrl = ref->ctrl;
2260 /* Skip handler-private controls. */
2261 if (ctrl->is_private)
2263 /* And control classes */
2264 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2266 /* Filter any unwanted controls */
2267 if (filter && !filter(ctrl))
2269 ret = handler_new_ref(hdl, ctrl);
2273 mutex_unlock(add->lock);
2276 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2278 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2280 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2282 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2285 case V4L2_CID_AUDIO_MUTE:
2286 case V4L2_CID_AUDIO_VOLUME:
2287 case V4L2_CID_AUDIO_BALANCE:
2288 case V4L2_CID_AUDIO_BASS:
2289 case V4L2_CID_AUDIO_TREBLE:
2290 case V4L2_CID_AUDIO_LOUDNESS:
2297 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2299 /* Cluster controls */
2300 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2302 bool has_volatiles = false;
2305 /* The first control is the master control and it must not be NULL */
2306 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2309 for (i = 0; i < ncontrols; i++) {
2311 controls[i]->cluster = controls;
2312 controls[i]->ncontrols = ncontrols;
2313 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2314 has_volatiles = true;
2317 controls[0]->has_volatiles = has_volatiles;
2319 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2321 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2322 u8 manual_val, bool set_volatile)
2324 struct v4l2_ctrl *master = controls[0];
2328 v4l2_ctrl_cluster(ncontrols, controls);
2329 WARN_ON(ncontrols <= 1);
2330 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2331 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2332 master->is_auto = true;
2333 master->has_volatiles = set_volatile;
2334 master->manual_mode_value = manual_val;
2335 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2337 if (!is_cur_manual(master))
2338 flag = V4L2_CTRL_FLAG_INACTIVE |
2339 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2341 for (i = 1; i < ncontrols; i++)
2343 controls[i]->flags |= flag;
2345 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2347 /* Activate/deactivate a control. */
2348 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2350 /* invert since the actual flag is called 'inactive' */
2351 bool inactive = !active;
2358 /* set V4L2_CTRL_FLAG_INACTIVE */
2359 old = test_and_set_bit(4, &ctrl->flags);
2361 /* clear V4L2_CTRL_FLAG_INACTIVE */
2362 old = test_and_clear_bit(4, &ctrl->flags);
2363 if (old != inactive)
2364 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2366 EXPORT_SYMBOL(v4l2_ctrl_activate);
2368 /* Grab/ungrab a control.
2369 Typically used when streaming starts and you want to grab controls,
2370 preventing the user from changing them.
2372 Just call this and the framework will block any attempts to change
2374 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2381 v4l2_ctrl_lock(ctrl);
2383 /* set V4L2_CTRL_FLAG_GRABBED */
2384 old = test_and_set_bit(1, &ctrl->flags);
2386 /* clear V4L2_CTRL_FLAG_GRABBED */
2387 old = test_and_clear_bit(1, &ctrl->flags);
2389 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2390 v4l2_ctrl_unlock(ctrl);
2392 EXPORT_SYMBOL(v4l2_ctrl_grab);
2394 /* Log the control name and value */
2395 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2396 const char *prefix, const char *colon)
2398 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2400 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2403 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2405 ctrl->type_ops->log(ctrl);
2407 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2408 V4L2_CTRL_FLAG_GRABBED |
2409 V4L2_CTRL_FLAG_VOLATILE)) {
2410 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2411 pr_cont(" inactive");
2412 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2413 pr_cont(" grabbed");
2414 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2415 pr_cont(" volatile");
2420 /* Log all controls owned by the handler */
2421 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2424 struct v4l2_ctrl *ctrl;
2425 const char *colon = "";
2432 len = strlen(prefix);
2433 if (len && prefix[len - 1] != ' ')
2435 mutex_lock(hdl->lock);
2436 list_for_each_entry(ctrl, &hdl->ctrls, node)
2437 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2438 log_ctrl(ctrl, prefix, colon);
2439 mutex_unlock(hdl->lock);
2441 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2443 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2445 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2448 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2450 /* Call s_ctrl for all controls owned by the handler */
2451 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2453 struct v4l2_ctrl *ctrl;
2458 mutex_lock(hdl->lock);
2459 list_for_each_entry(ctrl, &hdl->ctrls, node)
2462 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2463 struct v4l2_ctrl *master = ctrl->cluster[0];
2466 /* Skip if this control was already handled by a cluster. */
2467 /* Skip button controls and read-only controls. */
2468 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2469 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2472 for (i = 0; i < master->ncontrols; i++) {
2473 if (master->cluster[i]) {
2474 cur_to_new(master->cluster[i]);
2475 master->cluster[i]->is_new = 1;
2476 master->cluster[i]->done = true;
2479 ret = call_op(master, s_ctrl);
2483 mutex_unlock(hdl->lock);
2486 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2488 /* Implement VIDIOC_QUERY_EXT_CTRL */
2489 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2491 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2492 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2493 struct v4l2_ctrl_ref *ref;
2494 struct v4l2_ctrl *ctrl;
2499 mutex_lock(hdl->lock);
2501 /* Try to find it */
2502 ref = find_ref(hdl, id);
2504 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2506 /* Match any control that is not hidden */
2510 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2511 /* Match any hidden control */
2513 } else if ((qc->id & next_flags) == next_flags) {
2514 /* Match any control, compound or not */
2518 /* Find the next control with ID > qc->id */
2520 /* Did we reach the end of the control list? */
2521 if (id >= node2id(hdl->ctrl_refs.prev)) {
2522 ref = NULL; /* Yes, so there is no next control */
2524 /* We found a control with the given ID, so just get
2525 the next valid one in the list. */
2526 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2527 is_compound = ref->ctrl->is_array ||
2528 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2529 if (id < ref->ctrl->id &&
2530 (is_compound & mask) == match)
2533 if (&ref->node == &hdl->ctrl_refs)
2536 /* No control with the given ID exists, so start
2537 searching for the next largest ID. We know there
2538 is one, otherwise the first 'if' above would have
2540 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2541 is_compound = ref->ctrl->is_array ||
2542 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2543 if (id < ref->ctrl->id &&
2544 (is_compound & mask) == match)
2547 if (&ref->node == &hdl->ctrl_refs)
2551 mutex_unlock(hdl->lock);
2557 memset(qc, 0, sizeof(*qc));
2558 if (id >= V4L2_CID_PRIVATE_BASE)
2562 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2563 qc->flags = user_flags(ctrl);
2564 qc->type = ctrl->type;
2565 qc->elem_size = ctrl->elem_size;
2566 qc->elems = ctrl->elems;
2567 qc->nr_of_dims = ctrl->nr_of_dims;
2568 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2569 qc->minimum = ctrl->minimum;
2570 qc->maximum = ctrl->maximum;
2571 qc->default_value = ctrl->default_value;
2572 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2573 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2576 qc->step = ctrl->step;
2579 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2581 /* Implement VIDIOC_QUERYCTRL */
2582 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2584 struct v4l2_query_ext_ctrl qec = { qc->id };
2587 rc = v4l2_query_ext_ctrl(hdl, &qec);
2592 qc->type = qec.type;
2593 qc->flags = qec.flags;
2594 strlcpy(qc->name, qec.name, sizeof(qc->name));
2596 case V4L2_CTRL_TYPE_INTEGER:
2597 case V4L2_CTRL_TYPE_BOOLEAN:
2598 case V4L2_CTRL_TYPE_MENU:
2599 case V4L2_CTRL_TYPE_INTEGER_MENU:
2600 case V4L2_CTRL_TYPE_STRING:
2601 case V4L2_CTRL_TYPE_BITMASK:
2602 qc->minimum = qec.minimum;
2603 qc->maximum = qec.maximum;
2604 qc->step = qec.step;
2605 qc->default_value = qec.default_value;
2611 qc->default_value = 0;
2616 EXPORT_SYMBOL(v4l2_queryctrl);
2618 /* Implement VIDIOC_QUERYMENU */
2619 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2621 struct v4l2_ctrl *ctrl;
2624 ctrl = v4l2_ctrl_find(hdl, qm->id);
2630 switch (ctrl->type) {
2631 case V4L2_CTRL_TYPE_MENU:
2632 if (ctrl->qmenu == NULL)
2635 case V4L2_CTRL_TYPE_INTEGER_MENU:
2636 if (ctrl->qmenu_int == NULL)
2643 if (i < ctrl->minimum || i > ctrl->maximum)
2646 /* Use mask to see if this menu item should be skipped */
2647 if (ctrl->menu_skip_mask & (1 << i))
2649 /* Empty menu items should also be skipped */
2650 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2651 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2653 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2655 qm->value = ctrl->qmenu_int[i];
2659 EXPORT_SYMBOL(v4l2_querymenu);
2662 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2664 It is not a fully atomic operation, just best-effort only. After all, if
2665 multiple controls have to be set through multiple i2c writes (for example)
2666 then some initial writes may succeed while others fail. Thus leaving the
2667 system in an inconsistent state. The question is how much effort you are
2668 willing to spend on trying to make something atomic that really isn't.
2670 From the point of view of an application the main requirement is that
2671 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2672 error should be returned without actually affecting any controls.
2674 If all the values are correct, then it is acceptable to just give up
2675 in case of low-level errors.
2677 It is important though that the application can tell when only a partial
2678 configuration was done. The way we do that is through the error_idx field
2679 of struct v4l2_ext_controls: if that is equal to the count field then no
2680 controls were affected. Otherwise all controls before that index were
2681 successful in performing their 'get' or 'set' operation, the control at
2682 the given index failed, and you don't know what happened with the controls
2683 after the failed one. Since if they were part of a control cluster they
2684 could have been successfully processed (if a cluster member was encountered
2685 at index < error_idx), they could have failed (if a cluster member was at
2686 error_idx), or they may not have been processed yet (if the first cluster
2687 member appeared after error_idx).
2689 It is all fairly theoretical, though. In practice all you can do is to
2690 bail out. If error_idx == count, then it is an application bug. If
2691 error_idx < count then it is only an application bug if the error code was
2692 EBUSY. That usually means that something started streaming just when you
2693 tried to set the controls. In all other cases it is a driver/hardware
2694 problem and all you can do is to retry or bail out.
2696 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2697 never modifies controls the error_idx is just set to whatever control
2698 has an invalid value.
2701 /* Prepare for the extended g/s/try functions.
2702 Find the controls in the control array and do some basic checks. */
2703 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2704 struct v4l2_ext_controls *cs,
2705 struct v4l2_ctrl_helper *helpers,
2708 struct v4l2_ctrl_helper *h;
2709 bool have_clusters = false;
2712 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2713 struct v4l2_ext_control *c = &cs->controls[i];
2714 struct v4l2_ctrl_ref *ref;
2715 struct v4l2_ctrl *ctrl;
2716 u32 id = c->id & V4L2_CTRL_ID_MASK;
2721 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2722 V4L2_CTRL_ID2WHICH(id) != cs->which)
2725 /* Old-style private controls are not allowed for
2726 extended controls */
2727 if (id >= V4L2_CID_PRIVATE_BASE)
2729 ref = find_ref_lock(hdl, id);
2733 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2736 if (ctrl->cluster[0]->ncontrols > 1)
2737 have_clusters = true;
2738 if (ctrl->cluster[0] != ctrl)
2739 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2740 if (ctrl->is_ptr && !ctrl->is_string) {
2741 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2743 if (c->size < tot_size) {
2752 /* Store the ref to the master control of the cluster */
2755 /* Initially set next to 0, meaning that there is no other
2756 control in this helper array belonging to the same
2761 /* We are done if there were no controls that belong to a multi-
2766 /* The code below figures out in O(n) time which controls in the list
2767 belong to the same cluster. */
2769 /* This has to be done with the handler lock taken. */
2770 mutex_lock(hdl->lock);
2772 /* First zero the helper field in the master control references */
2773 for (i = 0; i < cs->count; i++)
2774 helpers[i].mref->helper = NULL;
2775 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2776 struct v4l2_ctrl_ref *mref = h->mref;
2778 /* If the mref->helper is set, then it points to an earlier
2779 helper that belongs to the same cluster. */
2781 /* Set the next field of mref->helper to the current
2782 index: this means that that earlier helper now
2783 points to the next helper in the same cluster. */
2784 mref->helper->next = i;
2785 /* mref should be set only for the first helper in the
2786 cluster, clear the others. */
2789 /* Point the mref helper to the current helper struct. */
2792 mutex_unlock(hdl->lock);
2796 /* Handles the corner case where cs->count == 0. It checks whether the
2797 specified control class exists. If that class ID is 0, then it checks
2798 whether there are any controls at all. */
2799 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2801 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2802 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2803 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2808 /* Get extended controls. Allocates the helpers array if needed. */
2809 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2811 struct v4l2_ctrl_helper helper[4];
2812 struct v4l2_ctrl_helper *helpers = helper;
2817 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2819 cs->error_idx = cs->count;
2820 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2826 return class_check(hdl, cs->which);
2828 if (cs->count > ARRAY_SIZE(helper)) {
2829 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2831 if (helpers == NULL)
2835 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2836 cs->error_idx = cs->count;
2838 for (i = 0; !ret && i < cs->count; i++)
2839 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2842 for (i = 0; !ret && i < cs->count; i++) {
2843 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2844 struct v4l2_ctrl *ctrl);
2845 struct v4l2_ctrl *master;
2847 ctrl_to_user = def_value ? def_to_user : cur_to_user;
2849 if (helpers[i].mref == NULL)
2852 master = helpers[i].mref->ctrl;
2855 v4l2_ctrl_lock(master);
2857 /* g_volatile_ctrl will update the new control values */
2859 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2860 (master->has_volatiles && !is_cur_manual(master)))) {
2861 for (j = 0; j < master->ncontrols; j++)
2862 cur_to_new(master->cluster[j]);
2863 ret = call_op(master, g_volatile_ctrl);
2864 ctrl_to_user = new_to_user;
2866 /* If OK, then copy the current (for non-volatile controls)
2867 or the new (for volatile controls) control values to the
2873 ret = ctrl_to_user(cs->controls + idx,
2875 idx = helpers[idx].next;
2876 } while (!ret && idx);
2878 v4l2_ctrl_unlock(master);
2881 if (cs->count > ARRAY_SIZE(helper))
2885 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2887 /* Helper function to get a single control */
2888 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2890 struct v4l2_ctrl *master = ctrl->cluster[0];
2894 /* Compound controls are not supported. The new_to_user() and
2895 * cur_to_user() calls below would need to be modified not to access
2896 * userspace memory when called from get_ctrl().
2898 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2901 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2904 v4l2_ctrl_lock(master);
2905 /* g_volatile_ctrl will update the current control values */
2906 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2907 for (i = 0; i < master->ncontrols; i++)
2908 cur_to_new(master->cluster[i]);
2909 ret = call_op(master, g_volatile_ctrl);
2910 new_to_user(c, ctrl);
2912 cur_to_user(c, ctrl);
2914 v4l2_ctrl_unlock(master);
2918 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2920 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2921 struct v4l2_ext_control c;
2924 if (ctrl == NULL || !ctrl->is_int)
2926 ret = get_ctrl(ctrl, &c);
2927 control->value = c.value;
2930 EXPORT_SYMBOL(v4l2_g_ctrl);
2932 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2934 struct v4l2_ext_control c;
2936 /* It's a driver bug if this happens. */
2937 WARN_ON(!ctrl->is_int);
2942 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2944 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2946 struct v4l2_ext_control c;
2948 /* It's a driver bug if this happens. */
2949 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2954 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2957 /* Core function that calls try/s_ctrl and ensures that the new value is
2958 copied to the current value on a set.
2959 Must be called with ctrl->handler->lock held. */
2960 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2961 bool set, u32 ch_flags)
2967 /* Go through the cluster and either validate the new value or
2968 (if no new value was set), copy the current value to the new
2969 value, ensuring a consistent view for the control ops when
2971 for (i = 0; i < master->ncontrols; i++) {
2972 struct v4l2_ctrl *ctrl = master->cluster[i];
2977 if (!ctrl->is_new) {
2981 /* Check again: it may have changed since the
2982 previous check in try_or_set_ext_ctrls(). */
2983 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2987 ret = call_op(master, try_ctrl);
2989 /* Don't set if there is no change */
2990 if (ret || !set || !cluster_changed(master))
2992 ret = call_op(master, s_ctrl);
2996 /* If OK, then make the new values permanent. */
2997 update_flag = is_cur_manual(master) != is_new_manual(master);
2998 for (i = 0; i < master->ncontrols; i++)
2999 new_to_cur(fh, master->cluster[i], ch_flags |
3000 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3004 /* Validate controls. */
3005 static int validate_ctrls(struct v4l2_ext_controls *cs,
3006 struct v4l2_ctrl_helper *helpers, bool set)
3011 cs->error_idx = cs->count;
3012 for (i = 0; i < cs->count; i++) {
3013 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3014 union v4l2_ctrl_ptr p_new;
3018 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3020 /* This test is also done in try_set_control_cluster() which
3021 is called in atomic context, so that has the final say,
3022 but it makes sense to do an up-front check as well. Once
3023 an error occurs in try_set_control_cluster() some other
3024 controls may have been set already and we want to do a
3025 best-effort to avoid that. */
3026 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3029 * Skip validation for now if the payload needs to be copied
3030 * from userspace into kernelspace. We'll validate those later.
3034 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3035 p_new.p_s64 = &cs->controls[i].value64;
3037 p_new.p_s32 = &cs->controls[i].value;
3038 ret = validate_new(ctrl, p_new);
3045 /* Obtain the current volatile values of an autocluster and mark them
3047 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3051 for (i = 1; i < master->ncontrols; i++)
3052 cur_to_new(master->cluster[i]);
3053 if (!call_op(master, g_volatile_ctrl))
3054 for (i = 1; i < master->ncontrols; i++)
3055 if (master->cluster[i])
3056 master->cluster[i]->is_new = 1;
3059 /* Try or try-and-set controls */
3060 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3061 struct v4l2_ext_controls *cs,
3064 struct v4l2_ctrl_helper helper[4];
3065 struct v4l2_ctrl_helper *helpers = helper;
3069 cs->error_idx = cs->count;
3071 /* Default value cannot be changed */
3072 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3075 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3081 return class_check(hdl, cs->which);
3083 if (cs->count > ARRAY_SIZE(helper)) {
3084 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3089 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3091 ret = validate_ctrls(cs, helpers, set);
3093 cs->error_idx = cs->count;
3094 for (i = 0; !ret && i < cs->count; i++) {
3095 struct v4l2_ctrl *master;
3098 if (helpers[i].mref == NULL)
3102 master = helpers[i].mref->ctrl;
3103 v4l2_ctrl_lock(master);
3105 /* Reset the 'is_new' flags of the cluster */
3106 for (j = 0; j < master->ncontrols; j++)
3107 if (master->cluster[j])
3108 master->cluster[j]->is_new = 0;
3110 /* For volatile autoclusters that are currently in auto mode
3111 we need to discover if it will be set to manual mode.
3112 If so, then we have to copy the current volatile values
3113 first since those will become the new manual values (which
3114 may be overwritten by explicit new values from this set
3116 if (master->is_auto && master->has_volatiles &&
3117 !is_cur_manual(master)) {
3118 /* Pick an initial non-manual value */
3119 s32 new_auto_val = master->manual_mode_value + 1;
3123 /* Check if the auto control is part of the
3124 list, and remember the new value. */
3125 if (helpers[tmp_idx].ctrl == master)
3126 new_auto_val = cs->controls[tmp_idx].value;
3127 tmp_idx = helpers[tmp_idx].next;
3129 /* If the new value == the manual value, then copy
3130 the current volatile values. */
3131 if (new_auto_val == master->manual_mode_value)
3132 update_from_auto_cluster(master);
3135 /* Copy the new caller-supplied control values.
3136 user_to_new() sets 'is_new' to 1. */
3138 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3140 ret = user_to_new(cs->controls + idx, ctrl);
3141 if (!ret && ctrl->is_ptr)
3142 ret = validate_new(ctrl, ctrl->p_new);
3143 idx = helpers[idx].next;
3144 } while (!ret && idx);
3147 ret = try_or_set_cluster(fh, master, set, 0);
3149 /* Copy the new values back to userspace. */
3153 ret = new_to_user(cs->controls + idx,
3155 idx = helpers[idx].next;
3156 } while (!ret && idx);
3158 v4l2_ctrl_unlock(master);
3161 if (cs->count > ARRAY_SIZE(helper))
3166 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3168 return try_set_ext_ctrls(NULL, hdl, cs, false);
3170 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3172 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3173 struct v4l2_ext_controls *cs)
3175 return try_set_ext_ctrls(fh, hdl, cs, true);
3177 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3179 /* Helper function for VIDIOC_S_CTRL compatibility */
3180 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3182 struct v4l2_ctrl *master = ctrl->cluster[0];
3186 /* Reset the 'is_new' flags of the cluster */
3187 for (i = 0; i < master->ncontrols; i++)
3188 if (master->cluster[i])
3189 master->cluster[i]->is_new = 0;
3191 ret = validate_new(ctrl, ctrl->p_new);
3195 /* For autoclusters with volatiles that are switched from auto to
3196 manual mode we have to update the current volatile values since
3197 those will become the initial manual values after such a switch. */
3198 if (master->is_auto && master->has_volatiles && ctrl == master &&
3199 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3200 update_from_auto_cluster(master);
3203 return try_or_set_cluster(fh, master, true, ch_flags);
3206 /* Helper function for VIDIOC_S_CTRL compatibility */
3207 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3208 struct v4l2_ext_control *c)
3212 v4l2_ctrl_lock(ctrl);
3213 user_to_new(c, ctrl);
3214 ret = set_ctrl(fh, ctrl, 0);
3216 cur_to_user(c, ctrl);
3217 v4l2_ctrl_unlock(ctrl);
3221 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3222 struct v4l2_control *control)
3224 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3225 struct v4l2_ext_control c = { control->id };
3228 if (ctrl == NULL || !ctrl->is_int)
3231 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3234 c.value = control->value;
3235 ret = set_ctrl_lock(fh, ctrl, &c);
3236 control->value = c.value;
3239 EXPORT_SYMBOL(v4l2_s_ctrl);
3241 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3243 lockdep_assert_held(ctrl->handler->lock);
3245 /* It's a driver bug if this happens. */
3246 WARN_ON(!ctrl->is_int);
3248 return set_ctrl(NULL, ctrl, 0);
3250 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3252 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3254 lockdep_assert_held(ctrl->handler->lock);
3256 /* It's a driver bug if this happens. */
3257 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3258 *ctrl->p_new.p_s64 = val;
3259 return set_ctrl(NULL, ctrl, 0);
3261 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3263 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3265 lockdep_assert_held(ctrl->handler->lock);
3267 /* It's a driver bug if this happens. */
3268 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3269 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3270 return set_ctrl(NULL, ctrl, 0);
3272 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3274 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3278 if (notify == NULL) {
3279 ctrl->call_notify = 0;
3282 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3284 ctrl->handler->notify = notify;
3285 ctrl->handler->notify_priv = priv;
3286 ctrl->call_notify = 1;
3288 EXPORT_SYMBOL(v4l2_ctrl_notify);
3290 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3291 s64 min, s64 max, u64 step, s64 def)
3294 bool range_changed = false;
3297 lockdep_assert_held(ctrl->handler->lock);
3299 switch (ctrl->type) {
3300 case V4L2_CTRL_TYPE_INTEGER:
3301 case V4L2_CTRL_TYPE_INTEGER64:
3302 case V4L2_CTRL_TYPE_BOOLEAN:
3303 case V4L2_CTRL_TYPE_MENU:
3304 case V4L2_CTRL_TYPE_INTEGER_MENU:
3305 case V4L2_CTRL_TYPE_BITMASK:
3306 case V4L2_CTRL_TYPE_U8:
3307 case V4L2_CTRL_TYPE_U16:
3308 case V4L2_CTRL_TYPE_U32:
3311 ret = check_range(ctrl->type, min, max, step, def);
3318 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3319 (ctrl->step != step) || ctrl->default_value != def) {
3320 range_changed = true;
3321 ctrl->minimum = min;
3322 ctrl->maximum = max;
3324 ctrl->default_value = def;
3327 if (validate_new(ctrl, ctrl->p_new)) {
3328 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3329 *ctrl->p_new.p_s64 = def;
3331 *ctrl->p_new.p_s32 = def;
3334 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3335 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3337 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3339 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3340 else if (range_changed)
3341 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3344 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3346 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3348 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3353 v4l2_ctrl_lock(ctrl);
3354 list_add_tail(&sev->node, &ctrl->ev_subs);
3355 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3356 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3357 struct v4l2_event ev;
3358 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3360 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3361 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3362 fill_event(&ev, ctrl, changes);
3363 /* Mark the queue as active, allowing this initial
3364 event to be accepted. */
3366 v4l2_event_queue_fh(sev->fh, &ev);
3368 v4l2_ctrl_unlock(ctrl);
3372 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3374 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3376 v4l2_ctrl_lock(ctrl);
3377 list_del(&sev->node);
3378 v4l2_ctrl_unlock(ctrl);
3381 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3383 u32 old_changes = old->u.ctrl.changes;
3385 old->u.ctrl = new->u.ctrl;
3386 old->u.ctrl.changes |= old_changes;
3388 EXPORT_SYMBOL(v4l2_ctrl_replace);
3390 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3392 new->u.ctrl.changes |= old->u.ctrl.changes;
3394 EXPORT_SYMBOL(v4l2_ctrl_merge);
3396 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3397 .add = v4l2_ctrl_add_event,
3398 .del = v4l2_ctrl_del_event,
3399 .replace = v4l2_ctrl_replace,
3400 .merge = v4l2_ctrl_merge,
3402 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3404 int v4l2_ctrl_log_status(struct file *file, void *fh)
3406 struct video_device *vfd = video_devdata(file);
3407 struct v4l2_fh *vfh = file->private_data;
3409 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3410 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3411 vfd->v4l2_dev->name);
3414 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3416 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3417 const struct v4l2_event_subscription *sub)
3419 if (sub->type == V4L2_EVENT_CTRL)
3420 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3423 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3425 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3426 struct v4l2_event_subscription *sub)
3428 if (!sd->ctrl_handler)
3430 return v4l2_ctrl_subscribe_event(fh, sub);
3432 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3434 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3436 struct v4l2_fh *fh = file->private_data;
3438 if (v4l2_event_pending(fh))
3440 poll_wait(file, &fh->wait, wait);
3443 EXPORT_SYMBOL(v4l2_ctrl_poll);