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linux/drivers/media/usb/uvc/uvcvideo.h
Laurent Pinchart 17706f5653 [media] uvcvideo: Fix open/close race condition 
Maintaining the users count using an atomic variable makes sure that
access to the counter won't be racy, but doesn't serialize access to the
operations protected by the counter. This creates a race condition that
could result in the status URB being submitted multiple times.
Use a mutex to protect the users count and serialize access to the
status start and stop operations.

Reported-by: Shawn Nematbakhsh <shawnn@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2013-06-08 19:51:16 -03:00

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#ifndef _USB_VIDEO_H_
#define _USB_VIDEO_H_
#ifndef __KERNEL__
#error "The uvcvideo.h header is deprecated, use linux/uvcvideo.h instead."
#endif /* __KERNEL__ */
#include <linux/kernel.h>
#include <linux/poll.h>
#include <linux/usb.h>
#include <linux/usb/video.h>
#include <linux/uvcvideo.h>
#include <linux/videodev2.h>
#include <media/media-device.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fh.h>
#include <media/videobuf2-core.h>
/* --------------------------------------------------------------------------
* UVC constants
*/
#define UVC_TERM_INPUT 0x0000
#define UVC_TERM_OUTPUT 0x8000
#define UVC_TERM_DIRECTION(term) ((term)->type & 0x8000)
#define UVC_ENTITY_TYPE(entity) ((entity)->type & 0x7fff)
#define UVC_ENTITY_IS_UNIT(entity) (((entity)->type & 0xff00) == 0)
#define UVC_ENTITY_IS_TERM(entity) (((entity)->type & 0xff00) != 0)
#define UVC_ENTITY_IS_ITERM(entity) \
(UVC_ENTITY_IS_TERM(entity) && \
((entity)->type & 0x8000) == UVC_TERM_INPUT)
#define UVC_ENTITY_IS_OTERM(entity) \
(UVC_ENTITY_IS_TERM(entity) && \
((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
/* ------------------------------------------------------------------------
* GUIDs
*/
#define UVC_GUID_UVC_CAMERA \
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
#define UVC_GUID_UVC_OUTPUT \
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}
#define UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT \
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}
#define UVC_GUID_UVC_PROCESSING \
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01}
#define UVC_GUID_UVC_SELECTOR \
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
#define UVC_GUID_FORMAT_MJPEG \
{ 'M', 'J', 'P', 'G', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_YUY2 \
{ 'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_YUY2_ISIGHT \
{ 'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0x00, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_NV12 \
{ 'N', 'V', '1', '2', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_YV12 \
{ 'Y', 'V', '1', '2', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_I420 \
{ 'I', '4', '2', '0', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_UYVY \
{ 'U', 'Y', 'V', 'Y', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_Y800 \
{ 'Y', '8', '0', '0', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_Y8 \
{ 'Y', '8', ' ', ' ', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_Y10 \
{ 'Y', '1', '0', ' ', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_Y12 \
{ 'Y', '1', '2', ' ', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_Y16 \
{ 'Y', '1', '6', ' ', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_BY8 \
{ 'B', 'Y', '8', ' ', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_RGBP \
{ 'R', 'G', 'B', 'P', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_M420 \
{ 'M', '4', '2', '0', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
#define UVC_GUID_FORMAT_H264 \
{ 'H', '2', '6', '4', 0x00, 0x00, 0x10, 0x00, \
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
/* ------------------------------------------------------------------------
* Driver specific constants.
*/
#define DRIVER_VERSION "1.1.1"
/* Number of isochronous URBs. */
#define UVC_URBS 5
/* Maximum number of packets per URB. */
#define UVC_MAX_PACKETS 32
/* Maximum number of video buffers. */
#define UVC_MAX_VIDEO_BUFFERS 32
/* Maximum status buffer size in bytes of interrupt URB. */
#define UVC_MAX_STATUS_SIZE 16
#define UVC_CTRL_CONTROL_TIMEOUT 300
#define UVC_CTRL_STREAMING_TIMEOUT 5000
/* Maximum allowed number of control mappings per device */
#define UVC_MAX_CONTROL_MAPPINGS 1024
#define UVC_MAX_CONTROL_MENU_ENTRIES 32
/* Devices quirks */
#define UVC_QUIRK_STATUS_INTERVAL 0x00000001
#define UVC_QUIRK_PROBE_MINMAX 0x00000002
#define UVC_QUIRK_PROBE_EXTRAFIELDS 0x00000004
#define UVC_QUIRK_BUILTIN_ISIGHT 0x00000008
#define UVC_QUIRK_STREAM_NO_FID 0x00000010
#define UVC_QUIRK_IGNORE_SELECTOR_UNIT 0x00000020
#define UVC_QUIRK_FIX_BANDWIDTH 0x00000080
#define UVC_QUIRK_PROBE_DEF 0x00000100
#define UVC_QUIRK_RESTRICT_FRAME_RATE 0x00000200
/* Format flags */
#define UVC_FMT_FLAG_COMPRESSED 0x00000001
#define UVC_FMT_FLAG_STREAM 0x00000002
/* ------------------------------------------------------------------------
* Structures.
*/
struct uvc_device;
/* TODO: Put the most frequently accessed fields at the beginning of
* structures to maximize cache efficiency.
*/
struct uvc_control_info {
struct list_head mappings;
__u8 entity[16];
__u8 index; /* Bit index in bmControls */
__u8 selector;
__u16 size;
__u32 flags;
};
struct uvc_control_mapping {
struct list_head list;
struct list_head ev_subs;
__u32 id;
__u8 name[32];
__u8 entity[16];
__u8 selector;
__u8 size;
__u8 offset;
enum v4l2_ctrl_type v4l2_type;
__u32 data_type;
struct uvc_menu_info *menu_info;
__u32 menu_count;
__u32 master_id;
__s32 master_manual;
__u32 slave_ids[2];
__s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,
const __u8 *data);
void (*set) (struct uvc_control_mapping *mapping, __s32 value,
__u8 *data);
};
struct uvc_control {
struct uvc_entity *entity;
struct uvc_control_info info;
__u8 index; /* Used to match the uvc_control entry with a
uvc_control_info. */
__u8 dirty:1,
loaded:1,
modified:1,
cached:1,
initialized:1;
__u8 *uvc_data;
};
struct uvc_format_desc {
char *name;
__u8 guid[16];
__u32 fcc;
};
/* The term 'entity' refers to both UVC units and UVC terminals.
*
* The type field is either the terminal type (wTerminalType in the terminal
* descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
* As the bDescriptorSubtype field is one byte long, the type value will
* always have a null MSB for units. All terminal types defined by the UVC
* specification have a non-null MSB, so it is safe to use the MSB to
* differentiate between units and terminals as long as the descriptor parsing
* code makes sure terminal types have a non-null MSB.
*
* For terminals, the type's most significant bit stores the terminal
* direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
* always be accessed with the UVC_ENTITY_* macros and never directly.
*/
#define UVC_ENTITY_FLAG_DEFAULT (1 << 0)
struct uvc_entity {
struct list_head list; /* Entity as part of a UVC device. */
struct list_head chain; /* Entity as part of a video device
* chain. */
unsigned int flags;
__u8 id;
__u16 type;
char name[64];
/* Media controller-related fields. */
struct video_device *vdev;
struct v4l2_subdev subdev;
unsigned int num_pads;
unsigned int num_links;
struct media_pad *pads;
union {
struct {
__u16 wObjectiveFocalLengthMin;
__u16 wObjectiveFocalLengthMax;
__u16 wOcularFocalLength;
__u8 bControlSize;
__u8 *bmControls;
} camera;
struct {
__u8 bControlSize;
__u8 *bmControls;
__u8 bTransportModeSize;
__u8 *bmTransportModes;
} media;
struct {
} output;
struct {
__u16 wMaxMultiplier;
__u8 bControlSize;
__u8 *bmControls;
__u8 bmVideoStandards;
} processing;
struct {
} selector;
struct {
__u8 guidExtensionCode[16];
__u8 bNumControls;
__u8 bControlSize;
__u8 *bmControls;
__u8 *bmControlsType;
} extension;
};
__u8 bNrInPins;
__u8 *baSourceID;
unsigned int ncontrols;
struct uvc_control *controls;
};
struct uvc_frame {
__u8 bFrameIndex;
__u8 bmCapabilities;
__u16 wWidth;
__u16 wHeight;
__u32 dwMinBitRate;
__u32 dwMaxBitRate;
__u32 dwMaxVideoFrameBufferSize;
__u8 bFrameIntervalType;
__u32 dwDefaultFrameInterval;
__u32 *dwFrameInterval;
};
struct uvc_format {
__u8 type;
__u8 index;
__u8 bpp;
__u8 colorspace;
__u32 fcc;
__u32 flags;
char name[32];
unsigned int nframes;
struct uvc_frame *frame;
};
struct uvc_streaming_header {
__u8 bNumFormats;
__u8 bEndpointAddress;
__u8 bTerminalLink;
__u8 bControlSize;
__u8 *bmaControls;
/* The following fields are used by input headers only. */
__u8 bmInfo;
__u8 bStillCaptureMethod;
__u8 bTriggerSupport;
__u8 bTriggerUsage;
};
enum uvc_buffer_state {
UVC_BUF_STATE_IDLE = 0,
UVC_BUF_STATE_QUEUED = 1,
UVC_BUF_STATE_ACTIVE = 2,
UVC_BUF_STATE_READY = 3,
UVC_BUF_STATE_DONE = 4,
UVC_BUF_STATE_ERROR = 5,
};
struct uvc_buffer {
struct vb2_buffer buf;
struct list_head queue;
enum uvc_buffer_state state;
unsigned int error;
void *mem;
unsigned int length;
unsigned int bytesused;
u32 pts;
};
#define UVC_QUEUE_DISCONNECTED (1 << 0)
#define UVC_QUEUE_DROP_CORRUPTED (1 << 1)
struct uvc_video_queue {
struct vb2_queue queue;
struct mutex mutex; /* Protects queue */
unsigned int flags;
unsigned int buf_used;
spinlock_t irqlock; /* Protects irqqueue */
struct list_head irqqueue;
};
struct uvc_video_chain {
struct uvc_device *dev;
struct list_head list;
struct list_head entities; /* All entities */
struct uvc_entity *processing; /* Processing unit */
struct uvc_entity *selector; /* Selector unit */
struct mutex ctrl_mutex; /* Protects ctrl.info */
struct v4l2_prio_state prio; /* V4L2 priority state */
u32 caps; /* V4L2 chain-wide caps */
};
struct uvc_stats_frame {
unsigned int size; /* Number of bytes captured */
unsigned int first_data; /* Index of the first non-empty packet */
unsigned int nb_packets; /* Number of packets */
unsigned int nb_empty; /* Number of empty packets */
unsigned int nb_invalid; /* Number of packets with an invalid header */
unsigned int nb_errors; /* Number of packets with the error bit set */
unsigned int nb_pts; /* Number of packets with a PTS timestamp */
unsigned int nb_pts_diffs; /* Number of PTS differences inside a frame */
unsigned int last_pts_diff; /* Index of the last PTS difference */
bool has_initial_pts; /* Whether the first non-empty packet has a PTS */
bool has_early_pts; /* Whether a PTS is present before the first non-empty packet */
u32 pts; /* PTS of the last packet */
unsigned int nb_scr; /* Number of packets with a SCR timestamp */
unsigned int nb_scr_diffs; /* Number of SCR.STC differences inside a frame */
u16 scr_sof; /* SCR.SOF of the last packet */
u32 scr_stc; /* SCR.STC of the last packet */
};
struct uvc_stats_stream {
struct timespec start_ts; /* Stream start timestamp */
struct timespec stop_ts; /* Stream stop timestamp */
unsigned int nb_frames; /* Number of frames */
unsigned int nb_packets; /* Number of packets */
unsigned int nb_empty; /* Number of empty packets */
unsigned int nb_invalid; /* Number of packets with an invalid header */
unsigned int nb_errors; /* Number of packets with the error bit set */
unsigned int nb_pts_constant; /* Number of frames with constant PTS */
unsigned int nb_pts_early; /* Number of frames with early PTS */
unsigned int nb_pts_initial; /* Number of frames with initial PTS */
unsigned int nb_scr_count_ok; /* Number of frames with at least one SCR per non empty packet */
unsigned int nb_scr_diffs_ok; /* Number of frames with varying SCR.STC */
unsigned int scr_sof_count; /* STC.SOF counter accumulated since stream start */
unsigned int scr_sof; /* STC.SOF of the last packet */
unsigned int min_sof; /* Minimum STC.SOF value */
unsigned int max_sof; /* Maximum STC.SOF value */
};
struct uvc_streaming {
struct list_head list;
struct uvc_device *dev;
struct video_device *vdev;
struct uvc_video_chain *chain;
atomic_t active;
struct usb_interface *intf;
int intfnum;
__u16 maxpsize;
struct uvc_streaming_header header;
enum v4l2_buf_type type;
unsigned int nformats;
struct uvc_format *format;
struct uvc_streaming_control ctrl;
struct uvc_format *def_format;
struct uvc_format *cur_format;
struct uvc_frame *cur_frame;
/* Protect access to ctrl, cur_format, cur_frame and hardware video
* probe control.
*/
struct mutex mutex;
/* Buffers queue. */
unsigned int frozen : 1;
struct uvc_video_queue queue;
void (*decode) (struct urb *urb, struct uvc_streaming *video,
struct uvc_buffer *buf);
/* Context data used by the bulk completion handler. */
struct {
__u8 header[256];
unsigned int header_size;
int skip_payload;
__u32 payload_size;
__u32 max_payload_size;
} bulk;
struct urb *urb[UVC_URBS];
char *urb_buffer[UVC_URBS];
dma_addr_t urb_dma[UVC_URBS];
unsigned int urb_size;
__u32 sequence;
__u8 last_fid;
/* debugfs */
struct dentry *debugfs_dir;
struct {
struct uvc_stats_frame frame;
struct uvc_stats_stream stream;
} stats;
/* Timestamps support. */
struct uvc_clock {
struct uvc_clock_sample {
u32 dev_stc;
u16 dev_sof;
struct timespec host_ts;
u16 host_sof;
} *samples;
unsigned int head;
unsigned int count;
unsigned int size;
u16 last_sof;
u16 sof_offset;
spinlock_t lock;
} clock;
};
enum uvc_device_state {
UVC_DEV_DISCONNECTED = 1,
};
struct uvc_device {
struct usb_device *udev;
struct usb_interface *intf;
unsigned long warnings;
__u32 quirks;
int intfnum;
char name[32];
enum uvc_device_state state;
struct mutex lock; /* Protects users */
unsigned int users;
atomic_t nmappings;
/* Video control interface */
#ifdef CONFIG_MEDIA_CONTROLLER
struct media_device mdev;
#endif
struct v4l2_device vdev;
__u16 uvc_version;
__u32 clock_frequency;
struct list_head entities;
struct list_head chains;
/* Video Streaming interfaces */
struct list_head streams;
atomic_t nstreams;
/* Status Interrupt Endpoint */
struct usb_host_endpoint *int_ep;
struct urb *int_urb;
__u8 *status;
struct input_dev *input;
char input_phys[64];
};
enum uvc_handle_state {
UVC_HANDLE_PASSIVE = 0,
UVC_HANDLE_ACTIVE = 1,
};
struct uvc_fh {
struct v4l2_fh vfh;
struct uvc_video_chain *chain;
struct uvc_streaming *stream;
enum uvc_handle_state state;
};
struct uvc_driver {
struct usb_driver driver;
};
/* ------------------------------------------------------------------------
* Debugging, printing and logging
*/
#define UVC_TRACE_PROBE (1 << 0)
#define UVC_TRACE_DESCR (1 << 1)
#define UVC_TRACE_CONTROL (1 << 2)
#define UVC_TRACE_FORMAT (1 << 3)
#define UVC_TRACE_CAPTURE (1 << 4)
#define UVC_TRACE_CALLS (1 << 5)
#define UVC_TRACE_IOCTL (1 << 6)
#define UVC_TRACE_FRAME (1 << 7)
#define UVC_TRACE_SUSPEND (1 << 8)
#define UVC_TRACE_STATUS (1 << 9)
#define UVC_TRACE_VIDEO (1 << 10)
#define UVC_TRACE_STATS (1 << 11)
#define UVC_TRACE_CLOCK (1 << 12)
#define UVC_WARN_MINMAX 0
#define UVC_WARN_PROBE_DEF 1
#define UVC_WARN_XU_GET_RES 2
extern unsigned int uvc_clock_param;
extern unsigned int uvc_no_drop_param;
extern unsigned int uvc_trace_param;
extern unsigned int uvc_timeout_param;
#define uvc_trace(flag, msg...) \
do { \
if (uvc_trace_param & flag) \
printk(KERN_DEBUG "uvcvideo: " msg); \
} while (0)
#define uvc_warn_once(dev, warn, msg...) \
do { \
if (!test_and_set_bit(warn, &dev->warnings)) \
printk(KERN_INFO "uvcvideo: " msg); \
} while (0)
#define uvc_printk(level, msg...) \
printk(level "uvcvideo: " msg)
/* --------------------------------------------------------------------------
* Internal functions.
*/
/* Core driver */
extern struct uvc_driver uvc_driver;
extern struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id);
/* Video buffers queue management. */
extern int uvc_queue_init(struct uvc_video_queue *queue,
enum v4l2_buf_type type, int drop_corrupted);
extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
struct v4l2_requestbuffers *rb);
extern void uvc_free_buffers(struct uvc_video_queue *queue);
extern int uvc_query_buffer(struct uvc_video_queue *queue,
struct v4l2_buffer *v4l2_buf);
extern int uvc_queue_buffer(struct uvc_video_queue *queue,
struct v4l2_buffer *v4l2_buf);
extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
struct v4l2_buffer *v4l2_buf, int nonblocking);
extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
struct uvc_buffer *buf);
extern int uvc_queue_mmap(struct uvc_video_queue *queue,
struct vm_area_struct *vma);
extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
struct file *file, poll_table *wait);
#ifndef CONFIG_MMU
extern unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
unsigned long pgoff);
#endif
extern int uvc_queue_allocated(struct uvc_video_queue *queue);
static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
{
return vb2_is_streaming(&queue->queue);
}
/* V4L2 interface */
extern const struct v4l2_file_operations uvc_fops;
/* Media controller */
extern int uvc_mc_register_entities(struct uvc_video_chain *chain);
extern void uvc_mc_cleanup_entity(struct uvc_entity *entity);
/* Video */
extern int uvc_video_init(struct uvc_streaming *stream);
extern int uvc_video_suspend(struct uvc_streaming *stream);
extern int uvc_video_resume(struct uvc_streaming *stream, int reset);
extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
extern int uvc_probe_video(struct uvc_streaming *stream,
struct uvc_streaming_control *probe);
extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
__u8 intfnum, __u8 cs, void *data, __u16 size);
void uvc_video_clock_update(struct uvc_streaming *stream,
struct v4l2_buffer *v4l2_buf,
struct uvc_buffer *buf);
/* Status */
extern int uvc_status_init(struct uvc_device *dev);
extern void uvc_status_cleanup(struct uvc_device *dev);
extern int uvc_status_start(struct uvc_device *dev, gfp_t flags);
extern void uvc_status_stop(struct uvc_device *dev);
/* Controls */
extern const struct v4l2_subscribed_event_ops uvc_ctrl_sub_ev_ops;
extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
struct v4l2_queryctrl *v4l2_ctrl);
extern int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
struct v4l2_querymenu *query_menu);
extern int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
const struct uvc_control_mapping *mapping);
extern int uvc_ctrl_init_device(struct uvc_device *dev);
extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
extern int uvc_ctrl_resume_device(struct uvc_device *dev);
extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
extern int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
const struct v4l2_ext_control *xctrls,
unsigned int xctrls_count);
static inline int uvc_ctrl_commit(struct uvc_fh *handle,
const struct v4l2_ext_control *xctrls,
unsigned int xctrls_count)
{
return __uvc_ctrl_commit(handle, 0, xctrls, xctrls_count);
}
static inline int uvc_ctrl_rollback(struct uvc_fh *handle)
{
return __uvc_ctrl_commit(handle, 1, NULL, 0);
}
extern int uvc_ctrl_get(struct uvc_video_chain *chain,
struct v4l2_ext_control *xctrl);
extern int uvc_ctrl_set(struct uvc_video_chain *chain,
struct v4l2_ext_control *xctrl);
extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
struct uvc_xu_control_query *xqry);
/* Utility functions */
extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
unsigned int n_terms, unsigned int threshold);
extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
uint32_t denominator);
extern struct usb_host_endpoint *uvc_find_endpoint(
struct usb_host_interface *alts, __u8 epaddr);
/* Quirks support */
void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
struct uvc_buffer *buf);
/* debugfs and statistics */
int uvc_debugfs_init(void);
void uvc_debugfs_cleanup(void);
int uvc_debugfs_init_stream(struct uvc_streaming *stream);
void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream);
size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf,
size_t size);
#endif
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