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_RGBP \
98 { 'R', 'G', 'B', 'P', 0x00, 0x00, 0x10, 0x00, \
99 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
100 #define UVC_GUID_FORMAT_M420 \
101 { 'M', '4', '2', '0', 0x00, 0x00, 0x10, 0x00, \
102 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
104 #define UVC_GUID_FORMAT_H264 \
105 { 'H', '2', '6', '4', 0x00, 0x00, 0x10, 0x00, \
106 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
108 /* ------------------------------------------------------------------------
109 * Driver specific constants.
112 #define DRIVER_VERSION "1.1.1"
114 /* Number of isochronous URBs. */
116 /* Maximum number of packets per URB. */
117 #define UVC_MAX_PACKETS 32
118 /* Maximum number of video buffers. */
119 #define UVC_MAX_VIDEO_BUFFERS 32
120 /* Maximum status buffer size in bytes of interrupt URB. */
121 #define UVC_MAX_STATUS_SIZE 16
123 #define UVC_CTRL_CONTROL_TIMEOUT 300
124 #define UVC_CTRL_STREAMING_TIMEOUT 5000
126 /* Maximum allowed number of control mappings per device */
127 #define UVC_MAX_CONTROL_MAPPINGS 1024
128 #define UVC_MAX_CONTROL_MENU_ENTRIES 32
131 #define UVC_QUIRK_STATUS_INTERVAL 0x00000001
132 #define UVC_QUIRK_PROBE_MINMAX 0x00000002
133 #define UVC_QUIRK_PROBE_EXTRAFIELDS 0x00000004
134 #define UVC_QUIRK_BUILTIN_ISIGHT 0x00000008
135 #define UVC_QUIRK_STREAM_NO_FID 0x00000010
136 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT 0x00000020
137 #define UVC_QUIRK_FIX_BANDWIDTH 0x00000080
138 #define UVC_QUIRK_PROBE_DEF 0x00000100
139 #define UVC_QUIRK_RESTRICT_FRAME_RATE 0x00000200
142 #define UVC_FMT_FLAG_COMPRESSED 0x00000001
143 #define UVC_FMT_FLAG_STREAM 0x00000002
145 /* ------------------------------------------------------------------------
151 /* TODO: Put the most frequently accessed fields at the beginning of
152 * structures to maximize cache efficiency.
154 struct uvc_control_info {
155 struct list_head mappings;
158 __u8 index; /* Bit index in bmControls */
165 struct uvc_control_mapping {
166 struct list_head list;
167 struct list_head ev_subs;
176 enum v4l2_ctrl_type v4l2_type;
179 struct uvc_menu_info *menu_info;
186 __s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,
188 void (*set) (struct uvc_control_mapping *mapping, __s32 value,
193 struct uvc_entity *entity;
194 struct uvc_control_info info;
196 __u8 index; /* Used to match the uvc_control entry with a
207 struct uvc_format_desc {
213 /* The term 'entity' refers to both UVC units and UVC terminals.
215 * The type field is either the terminal type (wTerminalType in the terminal
216 * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
217 * As the bDescriptorSubtype field is one byte long, the type value will
218 * always have a null MSB for units. All terminal types defined by the UVC
219 * specification have a non-null MSB, so it is safe to use the MSB to
220 * differentiate between units and terminals as long as the descriptor parsing
221 * code makes sure terminal types have a non-null MSB.
223 * For terminals, the type's most significant bit stores the terminal
224 * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
225 * always be accessed with the UVC_ENTITY_* macros and never directly.
228 #define UVC_ENTITY_FLAG_DEFAULT (1 << 0)
231 struct list_head list; /* Entity as part of a UVC device. */
232 struct list_head chain; /* Entity as part of a video device
240 /* Media controller-related fields. */
241 struct video_device *vdev;
242 struct v4l2_subdev subdev;
243 unsigned int num_pads;
244 unsigned int num_links;
245 struct media_pad *pads;
249 __u16 wObjectiveFocalLengthMin;
250 __u16 wObjectiveFocalLengthMax;
251 __u16 wOcularFocalLength;
259 __u8 bTransportModeSize;
260 __u8 *bmTransportModes;
267 __u16 wMaxMultiplier;
270 __u8 bmVideoStandards;
277 __u8 guidExtensionCode[16];
281 __u8 *bmControlsType;
288 unsigned int ncontrols;
289 struct uvc_control *controls;
299 __u32 dwMaxVideoFrameBufferSize;
300 __u8 bFrameIntervalType;
301 __u32 dwDefaultFrameInterval;
302 __u32 *dwFrameInterval;
315 unsigned int nframes;
316 struct uvc_frame *frame;
319 struct uvc_streaming_header {
321 __u8 bEndpointAddress;
325 /* The following fields are used by input headers only. */
327 __u8 bStillCaptureMethod;
328 __u8 bTriggerSupport;
332 enum uvc_buffer_state {
333 UVC_BUF_STATE_IDLE = 0,
334 UVC_BUF_STATE_QUEUED = 1,
335 UVC_BUF_STATE_ACTIVE = 2,
336 UVC_BUF_STATE_READY = 3,
337 UVC_BUF_STATE_DONE = 4,
338 UVC_BUF_STATE_ERROR = 5,
342 struct vb2_buffer buf;
343 struct list_head queue;
345 enum uvc_buffer_state state;
350 unsigned int bytesused;
355 #define UVC_QUEUE_DISCONNECTED (1 << 0)
356 #define UVC_QUEUE_DROP_CORRUPTED (1 << 1)
358 struct uvc_video_queue {
359 struct vb2_queue queue;
360 struct mutex mutex; /* Protects queue */
363 unsigned int buf_used;
365 spinlock_t irqlock; /* Protects irqqueue */
366 struct list_head irqqueue;
369 struct uvc_video_chain {
370 struct uvc_device *dev;
371 struct list_head list;
373 struct list_head entities; /* All entities */
374 struct uvc_entity *processing; /* Processing unit */
375 struct uvc_entity *selector; /* Selector unit */
377 struct mutex ctrl_mutex; /* Protects ctrl.info */
379 struct v4l2_prio_state prio; /* V4L2 priority state */
380 u32 caps; /* V4L2 chain-wide caps */
383 struct uvc_stats_frame {
384 unsigned int size; /* Number of bytes captured */
385 unsigned int first_data; /* Index of the first non-empty packet */
387 unsigned int nb_packets; /* Number of packets */
388 unsigned int nb_empty; /* Number of empty packets */
389 unsigned int nb_invalid; /* Number of packets with an invalid header */
390 unsigned int nb_errors; /* Number of packets with the error bit set */
392 unsigned int nb_pts; /* Number of packets with a PTS timestamp */
393 unsigned int nb_pts_diffs; /* Number of PTS differences inside a frame */
394 unsigned int last_pts_diff; /* Index of the last PTS difference */
395 bool has_initial_pts; /* Whether the first non-empty packet has a PTS */
396 bool has_early_pts; /* Whether a PTS is present before the first non-empty packet */
397 u32 pts; /* PTS of the last packet */
399 unsigned int nb_scr; /* Number of packets with a SCR timestamp */
400 unsigned int nb_scr_diffs; /* Number of SCR.STC differences inside a frame */
401 u16 scr_sof; /* SCR.SOF of the last packet */
402 u32 scr_stc; /* SCR.STC of the last packet */
405 struct uvc_stats_stream {
406 struct timespec start_ts; /* Stream start timestamp */
407 struct timespec stop_ts; /* Stream stop timestamp */
409 unsigned int nb_frames; /* Number of frames */
411 unsigned int nb_packets; /* Number of packets */
412 unsigned int nb_empty; /* Number of empty packets */
413 unsigned int nb_invalid; /* Number of packets with an invalid header */
414 unsigned int nb_errors; /* Number of packets with the error bit set */
416 unsigned int nb_pts_constant; /* Number of frames with constant PTS */
417 unsigned int nb_pts_early; /* Number of frames with early PTS */
418 unsigned int nb_pts_initial; /* Number of frames with initial PTS */
420 unsigned int nb_scr_count_ok; /* Number of frames with at least one SCR per non empty packet */
421 unsigned int nb_scr_diffs_ok; /* Number of frames with varying SCR.STC */
422 unsigned int scr_sof_count; /* STC.SOF counter accumulated since stream start */
423 unsigned int scr_sof; /* STC.SOF of the last packet */
424 unsigned int min_sof; /* Minimum STC.SOF value */
425 unsigned int max_sof; /* Maximum STC.SOF value */
433 struct uvc_streaming {
434 struct list_head list;
435 struct uvc_device *dev;
436 struct video_device *vdev;
437 struct uvc_video_chain *chain;
440 struct usb_interface *intf;
444 struct uvc_streaming_header header;
445 enum v4l2_buf_type type;
447 unsigned int nformats;
448 struct uvc_format *format;
450 struct uvc_streaming_control ctrl;
451 struct uvc_format *def_format;
452 struct uvc_format *cur_format;
453 struct uvc_frame *cur_frame;
454 /* Protect access to ctrl, cur_format, cur_frame and hardware video
460 unsigned int frozen : 1;
461 struct uvc_video_queue queue;
462 void (*decode) (struct urb *urb, struct uvc_streaming *video,
463 struct uvc_buffer *buf);
465 /* Context data used by the bulk completion handler. */
468 unsigned int header_size;
471 __u32 max_payload_size;
474 struct urb *urb[UVC_URBS];
475 char *urb_buffer[UVC_URBS];
476 dma_addr_t urb_dma[UVC_URBS];
477 unsigned int urb_size;
482 struct tasklet_struct *tasklet[UVC_URBS]; /* ddl@rock-chips.com */
483 atomic_t urb_state[UVC_URBS];
486 struct dentry *debugfs_dir;
488 struct uvc_stats_frame frame;
489 struct uvc_stats_stream stream;
492 /* Timestamps support. */
494 struct uvc_clock_sample {
497 struct timespec host_ts;
512 enum uvc_device_state {
513 UVC_DEV_DISCONNECTED = 1,
517 struct usb_device *udev;
518 struct usb_interface *intf;
519 unsigned long warnings;
524 enum uvc_device_state state;
528 /* Video control interface */
529 #ifdef CONFIG_MEDIA_CONTROLLER
530 struct media_device mdev;
532 struct v4l2_device vdev;
534 __u32 clock_frequency;
536 struct list_head entities;
537 struct list_head chains;
539 /* Video Streaming interfaces */
540 struct list_head streams;
543 /* Status Interrupt Endpoint */
544 struct usb_host_endpoint *int_ep;
547 struct input_dev *input;
551 enum uvc_handle_state {
552 UVC_HANDLE_PASSIVE = 0,
553 UVC_HANDLE_ACTIVE = 1,
558 struct uvc_video_chain *chain;
559 struct uvc_streaming *stream;
560 enum uvc_handle_state state;
564 struct usb_driver driver;
567 /* ------------------------------------------------------------------------
568 * Debugging, printing and logging
571 #define UVC_TRACE_PROBE (1 << 0)
572 #define UVC_TRACE_DESCR (1 << 1)
573 #define UVC_TRACE_CONTROL (1 << 2)
574 #define UVC_TRACE_FORMAT (1 << 3)
575 #define UVC_TRACE_CAPTURE (1 << 4)
576 #define UVC_TRACE_CALLS (1 << 5)
577 #define UVC_TRACE_IOCTL (1 << 6)
578 #define UVC_TRACE_FRAME (1 << 7)
579 #define UVC_TRACE_SUSPEND (1 << 8)
580 #define UVC_TRACE_STATUS (1 << 9)
581 #define UVC_TRACE_VIDEO (1 << 10)
582 #define UVC_TRACE_STATS (1 << 11)
583 #define UVC_TRACE_CLOCK (1 << 12)
585 #define UVC_WARN_MINMAX 0
586 #define UVC_WARN_PROBE_DEF 1
587 #define UVC_WARN_XU_GET_RES 2
589 extern unsigned int uvc_clock_param;
590 extern unsigned int uvc_no_drop_param;
591 extern unsigned int uvc_trace_param;
592 extern unsigned int uvc_timeout_param;
594 #define uvc_trace(flag, msg...) \
596 if (uvc_trace_param & flag) \
597 printk(KERN_DEBUG "uvcvideo: " msg); \
600 #define uvc_warn_once(dev, warn, msg...) \
602 if (!test_and_set_bit(warn, &dev->warnings)) \
603 printk(KERN_INFO "uvcvideo: " msg); \
606 #define uvc_printk(level, msg...) \
607 printk(level "uvcvideo: " msg)
609 /* --------------------------------------------------------------------------
610 * Internal functions.
614 extern struct uvc_driver uvc_driver;
616 extern struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id);
618 /* Video buffers queue management. */
619 extern int uvc_queue_init(struct uvc_video_queue *queue,
620 enum v4l2_buf_type type, int drop_corrupted);
621 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
622 struct v4l2_requestbuffers *rb);
623 extern void uvc_free_buffers(struct uvc_video_queue *queue);
624 extern int uvc_query_buffer(struct uvc_video_queue *queue,
625 struct v4l2_buffer *v4l2_buf);
626 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
627 struct v4l2_buffer *v4l2_buf);
628 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
629 struct v4l2_buffer *v4l2_buf, int nonblocking);
630 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
631 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
632 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
633 struct uvc_buffer *buf);
634 extern int uvc_queue_mmap(struct uvc_video_queue *queue,
635 struct vm_area_struct *vma);
636 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
637 struct file *file, poll_table *wait);
639 extern unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
640 unsigned long pgoff);
642 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
643 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
645 return vb2_is_streaming(&queue->queue);
649 extern const struct v4l2_file_operations uvc_fops;
651 /* Media controller */
652 extern int uvc_mc_register_entities(struct uvc_video_chain *chain);
653 extern void uvc_mc_cleanup_entity(struct uvc_entity *entity);
656 extern int uvc_video_init(struct uvc_streaming *stream);
657 extern int uvc_video_suspend(struct uvc_streaming *stream);
658 extern int uvc_video_resume(struct uvc_streaming *stream, int reset);
659 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
660 extern int uvc_probe_video(struct uvc_streaming *stream,
661 struct uvc_streaming_control *probe);
662 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
663 __u8 intfnum, __u8 cs, void *data, __u16 size);
664 void uvc_video_clock_update(struct uvc_streaming *stream,
665 struct v4l2_buffer *v4l2_buf,
666 struct uvc_buffer *buf);
669 extern int uvc_status_init(struct uvc_device *dev);
670 extern void uvc_status_cleanup(struct uvc_device *dev);
671 extern int uvc_status_start(struct uvc_device *dev);
672 extern void uvc_status_stop(struct uvc_device *dev);
673 extern int uvc_status_suspend(struct uvc_device *dev);
674 extern int uvc_status_resume(struct uvc_device *dev);
677 extern const struct v4l2_subscribed_event_ops uvc_ctrl_sub_ev_ops;
679 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
680 struct v4l2_queryctrl *v4l2_ctrl);
681 extern int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
682 struct v4l2_querymenu *query_menu);
684 extern int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
685 const struct uvc_control_mapping *mapping);
686 extern int uvc_ctrl_init_device(struct uvc_device *dev);
687 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
688 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
690 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
691 extern int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
692 const struct v4l2_ext_control *xctrls,
693 unsigned int xctrls_count);
694 static inline int uvc_ctrl_commit(struct uvc_fh *handle,
695 const struct v4l2_ext_control *xctrls,
696 unsigned int xctrls_count)
698 return __uvc_ctrl_commit(handle, 0, xctrls, xctrls_count);
700 static inline int uvc_ctrl_rollback(struct uvc_fh *handle)
702 return __uvc_ctrl_commit(handle, 1, NULL, 0);
705 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
706 struct v4l2_ext_control *xctrl);
707 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
708 struct v4l2_ext_control *xctrl);
710 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
711 struct uvc_xu_control_query *xqry);
713 /* Utility functions */
714 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
715 unsigned int n_terms, unsigned int threshold);
716 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
717 uint32_t denominator);
718 extern struct usb_host_endpoint *uvc_find_endpoint(
719 struct usb_host_interface *alts, __u8 epaddr);
722 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
723 struct uvc_buffer *buf);
725 /* debugfs and statistics */
726 int uvc_debugfs_init(void);
727 void uvc_debugfs_cleanup(void);
728 int uvc_debugfs_init_stream(struct uvc_streaming *stream);
729 void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream);
731 size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf,