5 #error "The uvcvideo.h header is deprecated, use linux/uvcvideo.h instead."
6 #endif /* __KERNEL__ */
8 #include <linux/kernel.h>
9 #include <linux/poll.h>
10 #include <linux/usb.h>
11 #include <linux/usb/video.h>
12 #include <linux/uvcvideo.h>
13 #include <linux/videodev2.h>
14 #include <media/media-device.h>
15 #include <media/v4l2-device.h>
16 #include <media/v4l2-event.h>
17 #include <media/v4l2-fh.h>
18 #include <media/videobuf2-core.h>
20 /* --------------------------------------------------------------------------
24 #define UVC_TERM_INPUT 0x0000
25 #define UVC_TERM_OUTPUT 0x8000
26 #define UVC_TERM_DIRECTION(term) ((term)->type & 0x8000)
28 #define UVC_ENTITY_TYPE(entity) ((entity)->type & 0x7fff)
29 #define UVC_ENTITY_IS_UNIT(entity) (((entity)->type & 0xff00) == 0)
30 #define UVC_ENTITY_IS_TERM(entity) (((entity)->type & 0xff00) != 0)
31 #define UVC_ENTITY_IS_ITERM(entity) \
32 (UVC_ENTITY_IS_TERM(entity) && \
33 ((entity)->type & 0x8000) == UVC_TERM_INPUT)
34 #define UVC_ENTITY_IS_OTERM(entity) \
35 (UVC_ENTITY_IS_TERM(entity) && \
36 ((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
39 /* ------------------------------------------------------------------------
42 #define UVC_GUID_UVC_CAMERA \
43 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
44 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
45 #define UVC_GUID_UVC_OUTPUT \
46 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
47 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}
48 #define UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT \
49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
50 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}
51 #define UVC_GUID_UVC_PROCESSING \
52 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
53 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01}
54 #define UVC_GUID_UVC_SELECTOR \
55 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
56 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
58 #define UVC_GUID_FORMAT_MJPEG \
59 { 'M', 'J', 'P', 'G', 0x00, 0x00, 0x10, 0x00, \
60 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
61 #define UVC_GUID_FORMAT_YUY2 \
62 { 'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00, \
63 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
64 #define UVC_GUID_FORMAT_YUY2_ISIGHT \
65 { 'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00, \
66 0x80, 0x00, 0x00, 0x00, 0x00, 0x38, 0x9b, 0x71}
67 #define UVC_GUID_FORMAT_NV12 \
68 { 'N', 'V', '1', '2', 0x00, 0x00, 0x10, 0x00, \
69 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
70 #define UVC_GUID_FORMAT_YV12 \
71 { 'Y', 'V', '1', '2', 0x00, 0x00, 0x10, 0x00, \
72 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
73 #define UVC_GUID_FORMAT_I420 \
74 { 'I', '4', '2', '0', 0x00, 0x00, 0x10, 0x00, \
75 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
76 #define UVC_GUID_FORMAT_UYVY \
77 { 'U', 'Y', 'V', 'Y', 0x00, 0x00, 0x10, 0x00, \
78 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
79 #define UVC_GUID_FORMAT_Y800 \
80 { 'Y', '8', '0', '0', 0x00, 0x00, 0x10, 0x00, \
81 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
82 #define UVC_GUID_FORMAT_Y8 \
83 { 'Y', '8', ' ', ' ', 0x00, 0x00, 0x10, 0x00, \
84 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
85 #define UVC_GUID_FORMAT_Y10 \
86 { 'Y', '1', '0', ' ', 0x00, 0x00, 0x10, 0x00, \
87 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
88 #define UVC_GUID_FORMAT_Y12 \
89 { 'Y', '1', '2', ' ', 0x00, 0x00, 0x10, 0x00, \
90 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
91 #define UVC_GUID_FORMAT_Y16 \
92 { 'Y', '1', '6', ' ', 0x00, 0x00, 0x10, 0x00, \
93 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
94 #define UVC_GUID_FORMAT_BY8 \
95 { 'B', 'Y', '8', ' ', 0x00, 0x00, 0x10, 0x00, \
96 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
97 #define UVC_GUID_FORMAT_BA81 \
98 { 'B', 'A', '8', '1', 0x00, 0x00, 0x10, 0x00, \
99 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
100 #define UVC_GUID_FORMAT_GBRG \
101 { 'G', 'B', 'R', 'G', 0x00, 0x00, 0x10, 0x00, \
102 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
103 #define UVC_GUID_FORMAT_GRBG \
104 { 'G', 'R', 'B', 'G', 0x00, 0x00, 0x10, 0x00, \
105 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
106 #define UVC_GUID_FORMAT_RGGB \
107 { 'R', 'G', 'G', 'B', 0x00, 0x00, 0x10, 0x00, \
108 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
109 #define UVC_GUID_FORMAT_RGBP \
110 { 'R', 'G', 'B', 'P', 0x00, 0x00, 0x10, 0x00, \
111 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
112 #define UVC_GUID_FORMAT_M420 \
113 { 'M', '4', '2', '0', 0x00, 0x00, 0x10, 0x00, \
114 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
116 #define UVC_GUID_FORMAT_H264 \
117 { 'H', '2', '6', '4', 0x00, 0x00, 0x10, 0x00, \
118 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
120 /* ------------------------------------------------------------------------
121 * Driver specific constants.
124 #define DRIVER_VERSION "1.1.1"
126 /* Number of isochronous URBs. */
128 /* Maximum number of packets per URB. */
129 #define UVC_MAX_PACKETS 32
130 /* Maximum status buffer size in bytes of interrupt URB. */
131 #define UVC_MAX_STATUS_SIZE 16
133 #define UVC_CTRL_CONTROL_TIMEOUT 300
134 #define UVC_CTRL_STREAMING_TIMEOUT 5000
136 /* Maximum allowed number of control mappings per device */
137 #define UVC_MAX_CONTROL_MAPPINGS 1024
138 #define UVC_MAX_CONTROL_MENU_ENTRIES 32
141 #define UVC_QUIRK_STATUS_INTERVAL 0x00000001
142 #define UVC_QUIRK_PROBE_MINMAX 0x00000002
143 #define UVC_QUIRK_PROBE_EXTRAFIELDS 0x00000004
144 #define UVC_QUIRK_BUILTIN_ISIGHT 0x00000008
145 #define UVC_QUIRK_STREAM_NO_FID 0x00000010
146 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT 0x00000020
147 #define UVC_QUIRK_FIX_BANDWIDTH 0x00000080
148 #define UVC_QUIRK_PROBE_DEF 0x00000100
149 #define UVC_QUIRK_RESTRICT_FRAME_RATE 0x00000200
150 #define UVC_QUIRK_RESTORE_CTRLS_ON_INIT 0x00000400
153 #define UVC_FMT_FLAG_COMPRESSED 0x00000001
154 #define UVC_FMT_FLAG_STREAM 0x00000002
156 /* ------------------------------------------------------------------------
162 /* TODO: Put the most frequently accessed fields at the beginning of
163 * structures to maximize cache efficiency.
165 struct uvc_control_info {
166 struct list_head mappings;
169 __u8 index; /* Bit index in bmControls */
176 struct uvc_control_mapping {
177 struct list_head list;
178 struct list_head ev_subs;
187 enum v4l2_ctrl_type v4l2_type;
190 struct uvc_menu_info *menu_info;
197 __s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,
199 void (*set) (struct uvc_control_mapping *mapping, __s32 value,
204 struct uvc_entity *entity;
205 struct uvc_control_info info;
207 __u8 index; /* Used to match the uvc_control entry with a
218 struct uvc_format_desc {
224 /* The term 'entity' refers to both UVC units and UVC terminals.
226 * The type field is either the terminal type (wTerminalType in the terminal
227 * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
228 * As the bDescriptorSubtype field is one byte long, the type value will
229 * always have a null MSB for units. All terminal types defined by the UVC
230 * specification have a non-null MSB, so it is safe to use the MSB to
231 * differentiate between units and terminals as long as the descriptor parsing
232 * code makes sure terminal types have a non-null MSB.
234 * For terminals, the type's most significant bit stores the terminal
235 * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
236 * always be accessed with the UVC_ENTITY_* macros and never directly.
239 #define UVC_ENTITY_FLAG_DEFAULT (1 << 0)
242 struct list_head list; /* Entity as part of a UVC device. */
243 struct list_head chain; /* Entity as part of a video device
251 /* Media controller-related fields. */
252 struct video_device *vdev;
253 struct v4l2_subdev subdev;
254 unsigned int num_pads;
255 unsigned int num_links;
256 struct media_pad *pads;
260 __u16 wObjectiveFocalLengthMin;
261 __u16 wObjectiveFocalLengthMax;
262 __u16 wOcularFocalLength;
270 __u8 bTransportModeSize;
271 __u8 *bmTransportModes;
278 __u16 wMaxMultiplier;
281 __u8 bmVideoStandards;
288 __u8 guidExtensionCode[16];
292 __u8 *bmControlsType;
299 unsigned int ncontrols;
300 struct uvc_control *controls;
310 __u32 dwMaxVideoFrameBufferSize;
311 __u8 bFrameIntervalType;
312 __u32 dwDefaultFrameInterval;
313 __u32 *dwFrameInterval;
326 unsigned int nframes;
327 struct uvc_frame *frame;
330 struct uvc_streaming_header {
332 __u8 bEndpointAddress;
336 /* The following fields are used by input headers only. */
338 __u8 bStillCaptureMethod;
339 __u8 bTriggerSupport;
343 enum uvc_buffer_state {
344 UVC_BUF_STATE_IDLE = 0,
345 UVC_BUF_STATE_QUEUED = 1,
346 UVC_BUF_STATE_ACTIVE = 2,
347 UVC_BUF_STATE_READY = 3,
348 UVC_BUF_STATE_DONE = 4,
349 UVC_BUF_STATE_ERROR = 5,
353 struct vb2_buffer buf;
354 struct list_head queue;
356 enum uvc_buffer_state state;
361 unsigned int bytesused;
366 #define UVC_QUEUE_DISCONNECTED (1 << 0)
367 #define UVC_QUEUE_DROP_CORRUPTED (1 << 1)
369 struct uvc_video_queue {
370 struct vb2_queue queue;
371 struct mutex mutex; /* Protects queue */
374 unsigned int buf_used;
376 spinlock_t irqlock; /* Protects irqqueue */
377 struct list_head irqqueue;
380 struct uvc_video_chain {
381 struct uvc_device *dev;
382 struct list_head list;
384 struct list_head entities; /* All entities */
385 struct uvc_entity *processing; /* Processing unit */
386 struct uvc_entity *selector; /* Selector unit */
388 struct mutex ctrl_mutex; /* Protects ctrl.info */
390 struct v4l2_prio_state prio; /* V4L2 priority state */
391 u32 caps; /* V4L2 chain-wide caps */
394 struct uvc_stats_frame {
395 unsigned int size; /* Number of bytes captured */
396 unsigned int first_data; /* Index of the first non-empty packet */
398 unsigned int nb_packets; /* Number of packets */
399 unsigned int nb_empty; /* Number of empty packets */
400 unsigned int nb_invalid; /* Number of packets with an invalid header */
401 unsigned int nb_errors; /* Number of packets with the error bit set */
403 unsigned int nb_pts; /* Number of packets with a PTS timestamp */
404 unsigned int nb_pts_diffs; /* Number of PTS differences inside a frame */
405 unsigned int last_pts_diff; /* Index of the last PTS difference */
406 bool has_initial_pts; /* Whether the first non-empty packet has a PTS */
407 bool has_early_pts; /* Whether a PTS is present before the first non-empty packet */
408 u32 pts; /* PTS of the last packet */
410 unsigned int nb_scr; /* Number of packets with a SCR timestamp */
411 unsigned int nb_scr_diffs; /* Number of SCR.STC differences inside a frame */
412 u16 scr_sof; /* SCR.SOF of the last packet */
413 u32 scr_stc; /* SCR.STC of the last packet */
416 struct uvc_stats_stream {
417 struct timespec start_ts; /* Stream start timestamp */
418 struct timespec stop_ts; /* Stream stop timestamp */
420 unsigned int nb_frames; /* Number of frames */
422 unsigned int nb_packets; /* Number of packets */
423 unsigned int nb_empty; /* Number of empty packets */
424 unsigned int nb_invalid; /* Number of packets with an invalid header */
425 unsigned int nb_errors; /* Number of packets with the error bit set */
427 unsigned int nb_pts_constant; /* Number of frames with constant PTS */
428 unsigned int nb_pts_early; /* Number of frames with early PTS */
429 unsigned int nb_pts_initial; /* Number of frames with initial PTS */
431 unsigned int nb_scr_count_ok; /* Number of frames with at least one SCR per non empty packet */
432 unsigned int nb_scr_diffs_ok; /* Number of frames with varying SCR.STC */
433 unsigned int scr_sof_count; /* STC.SOF counter accumulated since stream start */
434 unsigned int scr_sof; /* STC.SOF of the last packet */
435 unsigned int min_sof; /* Minimum STC.SOF value */
436 unsigned int max_sof; /* Maximum STC.SOF value */
439 struct uvc_streaming {
440 struct list_head list;
441 struct uvc_device *dev;
442 struct video_device *vdev;
443 struct uvc_video_chain *chain;
446 struct usb_interface *intf;
450 struct uvc_streaming_header header;
451 enum v4l2_buf_type type;
453 unsigned int nformats;
454 struct uvc_format *format;
456 struct uvc_streaming_control ctrl;
457 struct uvc_format *def_format;
458 struct uvc_format *cur_format;
459 struct uvc_frame *cur_frame;
461 /* Protect access to ctrl, cur_format, cur_frame and hardware video
467 unsigned int frozen : 1;
468 struct uvc_video_queue queue;
469 void (*decode) (struct urb *urb, struct uvc_streaming *video,
470 struct uvc_buffer *buf);
472 /* Context data used by the bulk completion handler. */
475 unsigned int header_size;
478 __u32 max_payload_size;
481 struct urb *urb[UVC_URBS];
482 char *urb_buffer[UVC_URBS];
483 dma_addr_t urb_dma[UVC_URBS];
484 unsigned int urb_size;
490 struct dentry *debugfs_dir;
492 struct uvc_stats_frame frame;
493 struct uvc_stats_stream stream;
496 /* Timestamps support. */
498 struct uvc_clock_sample {
501 struct timespec host_ts;
516 enum uvc_device_state {
517 UVC_DEV_DISCONNECTED = 1,
521 struct usb_device *udev;
522 struct usb_interface *intf;
523 unsigned long warnings;
528 enum uvc_device_state state;
529 struct mutex lock; /* Protects users */
533 /* Video control interface */
534 #ifdef CONFIG_MEDIA_CONTROLLER
535 struct media_device mdev;
537 struct v4l2_device vdev;
539 __u32 clock_frequency;
541 struct list_head entities;
542 struct list_head chains;
544 /* Video Streaming interfaces */
545 struct list_head streams;
548 /* Status Interrupt Endpoint */
549 struct usb_host_endpoint *int_ep;
552 struct input_dev *input;
556 enum uvc_handle_state {
557 UVC_HANDLE_PASSIVE = 0,
558 UVC_HANDLE_ACTIVE = 1,
563 struct uvc_video_chain *chain;
564 struct uvc_streaming *stream;
565 enum uvc_handle_state state;
569 struct usb_driver driver;
572 /* ------------------------------------------------------------------------
573 * Debugging, printing and logging
576 #define UVC_TRACE_PROBE (1 << 0)
577 #define UVC_TRACE_DESCR (1 << 1)
578 #define UVC_TRACE_CONTROL (1 << 2)
579 #define UVC_TRACE_FORMAT (1 << 3)
580 #define UVC_TRACE_CAPTURE (1 << 4)
581 #define UVC_TRACE_CALLS (1 << 5)
582 #define UVC_TRACE_IOCTL (1 << 6)
583 #define UVC_TRACE_FRAME (1 << 7)
584 #define UVC_TRACE_SUSPEND (1 << 8)
585 #define UVC_TRACE_STATUS (1 << 9)
586 #define UVC_TRACE_VIDEO (1 << 10)
587 #define UVC_TRACE_STATS (1 << 11)
588 #define UVC_TRACE_CLOCK (1 << 12)
590 #define UVC_WARN_MINMAX 0
591 #define UVC_WARN_PROBE_DEF 1
592 #define UVC_WARN_XU_GET_RES 2
594 extern unsigned int uvc_clock_param;
595 extern unsigned int uvc_no_drop_param;
596 extern unsigned int uvc_trace_param;
597 extern unsigned int uvc_timeout_param;
599 #define uvc_trace(flag, msg...) \
601 if (uvc_trace_param & flag) \
602 printk(KERN_DEBUG "uvcvideo: " msg); \
605 #define uvc_warn_once(dev, warn, msg...) \
607 if (!test_and_set_bit(warn, &dev->warnings)) \
608 printk(KERN_INFO "uvcvideo: " msg); \
611 #define uvc_printk(level, msg...) \
612 printk(level "uvcvideo: " msg)
614 /* --------------------------------------------------------------------------
615 * Internal functions.
619 extern struct uvc_driver uvc_driver;
621 extern struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id);
623 /* Video buffers queue management. */
624 extern int uvc_queue_init(struct uvc_video_queue *queue,
625 enum v4l2_buf_type type, int drop_corrupted);
626 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
627 struct v4l2_requestbuffers *rb);
628 extern void uvc_free_buffers(struct uvc_video_queue *queue);
629 extern int uvc_query_buffer(struct uvc_video_queue *queue,
630 struct v4l2_buffer *v4l2_buf);
631 extern int uvc_create_buffers(struct uvc_video_queue *queue,
632 struct v4l2_create_buffers *v4l2_cb);
633 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
634 struct v4l2_buffer *v4l2_buf);
635 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
636 struct v4l2_buffer *v4l2_buf, int nonblocking);
637 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
638 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
639 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
640 struct uvc_buffer *buf);
641 extern int uvc_queue_mmap(struct uvc_video_queue *queue,
642 struct vm_area_struct *vma);
643 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
644 struct file *file, poll_table *wait);
646 extern unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
647 unsigned long pgoff);
649 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
650 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
652 return vb2_is_streaming(&queue->queue);
656 extern const struct v4l2_file_operations uvc_fops;
658 /* Media controller */
659 extern int uvc_mc_register_entities(struct uvc_video_chain *chain);
660 extern void uvc_mc_cleanup_entity(struct uvc_entity *entity);
663 extern int uvc_video_init(struct uvc_streaming *stream);
664 extern int uvc_video_suspend(struct uvc_streaming *stream);
665 extern int uvc_video_resume(struct uvc_streaming *stream, int reset);
666 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
667 extern int uvc_probe_video(struct uvc_streaming *stream,
668 struct uvc_streaming_control *probe);
669 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
670 __u8 intfnum, __u8 cs, void *data, __u16 size);
671 void uvc_video_clock_update(struct uvc_streaming *stream,
672 struct v4l2_buffer *v4l2_buf,
673 struct uvc_buffer *buf);
676 extern int uvc_status_init(struct uvc_device *dev);
677 extern void uvc_status_cleanup(struct uvc_device *dev);
678 extern int uvc_status_start(struct uvc_device *dev, gfp_t flags);
679 extern void uvc_status_stop(struct uvc_device *dev);
682 extern const struct v4l2_subscribed_event_ops uvc_ctrl_sub_ev_ops;
684 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
685 struct v4l2_queryctrl *v4l2_ctrl);
686 extern int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
687 struct v4l2_querymenu *query_menu);
689 extern int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
690 const struct uvc_control_mapping *mapping);
691 extern int uvc_ctrl_init_device(struct uvc_device *dev);
692 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
693 extern int uvc_ctrl_restore_values(struct uvc_device *dev);
695 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
696 extern int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
697 const struct v4l2_ext_control *xctrls,
698 unsigned int xctrls_count);
699 static inline int uvc_ctrl_commit(struct uvc_fh *handle,
700 const struct v4l2_ext_control *xctrls,
701 unsigned int xctrls_count)
703 return __uvc_ctrl_commit(handle, 0, xctrls, xctrls_count);
705 static inline int uvc_ctrl_rollback(struct uvc_fh *handle)
707 return __uvc_ctrl_commit(handle, 1, NULL, 0);
710 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
711 struct v4l2_ext_control *xctrl);
712 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
713 struct v4l2_ext_control *xctrl);
715 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
716 struct uvc_xu_control_query *xqry);
718 /* Utility functions */
719 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
720 unsigned int n_terms, unsigned int threshold);
721 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
722 uint32_t denominator);
723 extern struct usb_host_endpoint *uvc_find_endpoint(
724 struct usb_host_interface *alts, __u8 epaddr);
727 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
728 struct uvc_buffer *buf);
730 /* debugfs and statistics */
731 int uvc_debugfs_init(void);
732 void uvc_debugfs_cleanup(void);
733 int uvc_debugfs_init_stream(struct uvc_streaming *stream);
734 void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream);
736 size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf,