uvcvideo.h

trident tm5600的linux驱动

	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.
 */

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. */
	__u8 id;
	__u16 type;
	char name[64];

	union {
		struct {
			__u16 wObjectiveFocalLengthMin;
			__u16 wObjectiveFocalLengthMax;
			__u16 wOcularFocalLength;
			__u8  bControlSize;
			__u8  *bmControls;
		} camera;

		struct {
			__u8  bControlSize;
			__u8  *bmControls;
			__u8  bTransportModeSize;
			__u8  *bmTransportModes;
		} media;

		struct {
			__u8  bSourceID;
		} output;

		struct {
			__u8  bSourceID;
			__u16 wMaxMultiplier;
			__u8  bControlSize;
			__u8  *bmControls;
			__u8  bmVideoStandards;
		} processing;

		struct {
			__u8  bNrInPins;
			__u8  *baSourceID;
		} selector;

		struct {
			__u8  guidExtensionCode[16];
			__u8  bNumControls;
			__u8  bNrInPins;
			__u8  *baSourceID;
			__u8  bControlSize;
			__u8  *bmControls;
			__u8  *bmControlsType;
		} extension;
	};

	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;
};

struct uvc_streaming {
	struct list_head list;

	struct usb_interface *intf;
	int intfnum;
	__u16 maxpsize;

	struct uvc_streaming_header header;

	unsigned int nformats;
	struct uvc_format *format;

	struct uvc_streaming_control ctrl;
	struct uvc_format *cur_format;
	struct uvc_frame *cur_frame;

	struct mutex mutex;
};

enum uvc_buffer_state {
	UVC_BUF_STATE_IDLE       = 0,
	UVC_BUF_STATE_QUEUED     = 1,
	UVC_BUF_STATE_ACTIVE     = 2,
	UVC_BUF_STATE_DONE       = 3,
	UVC_BUF_STATE_ERROR      = 4,
};

struct uvc_buffer {
	unsigned long vma_use_count;
	struct list_head stream;

	/* Touched by interrupt handler. */
	struct v4l2_buffer buf;
	struct list_head queue;
	wait_queue_head_t wait;
	enum uvc_buffer_state state;
};

#define UVC_QUEUE_STREAMING		(1 << 0)
#define UVC_QUEUE_DISCONNECTED		(1 << 1)
#define UVC_QUEUE_DROP_INCOMPLETE	(1 << 2)

struct uvc_video_queue {
	void *mem;
	unsigned int flags;
	__u32 sequence;

	unsigned int count;
	unsigned int buf_size;
	struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
	struct mutex mutex;	/* protects buffers and mainqueue */
	spinlock_t irqlock;	/* protects irqqueue */

	struct list_head mainqueue;
	struct list_head irqqueue;
};

struct uvc_video_device {
	struct uvc_device *dev;
	struct video_device *vdev;
	atomic_t active;
	unsigned int frozen : 1;

	struct list_head iterms;
	struct uvc_entity *oterm;
	struct uvc_entity *processing;
	struct uvc_entity *selector;
	struct list_head extensions;
	struct mutex ctrl_mutex;

	struct uvc_video_queue queue;

	/* Video streaming object, must always be non-NULL. */
	struct uvc_streaming *streaming;

	void (*decode) (struct urb *urb, struct uvc_video_device *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;

	__u8 last_fid;
};

enum uvc_device_state {
	UVC_DEV_DISCONNECTED = 1,
};

struct uvc_device {
	struct usb_device *udev;
	struct usb_interface *intf;
	__u32 quirks;
	int intfnum;
	char name[32];

	enum uvc_device_state state;
	struct kref kref;
	struct list_head list;

	/* Video control interface */
	__u16 uvc_version;
	__u32 clock_frequency;

	struct list_head entities;

	struct uvc_video_device video;

	/* Status Interrupt Endpoint */
	struct usb_host_endpoint *int_ep;
	struct urb *int_urb;
	__u8 *status;
	struct input_dev *input;

	/* Video Streaming interfaces */
	struct list_head streaming;
};

enum uvc_handle_state {
	UVC_HANDLE_PASSIVE	= 0,
	UVC_HANDLE_ACTIVE	= 1,
};

struct uvc_fh {
	struct uvc_video_device *device;
	enum uvc_handle_state state;
};

struct uvc_driver {
	struct usb_driver driver;

	struct mutex open_mutex;	/* protects from open/disconnect race */

	struct list_head devices;	/* struct uvc_device list */
	struct list_head controls;	/* struct uvc_control_info list */
	struct mutex ctrl_mutex;	/* protects controls and devices
					   lists */
};

/* ------------------------------------------------------------------------
 * 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)

extern unsigned int uvc_trace_param;

#define uvc_trace(flag, msg...) \
	do { \
		if (uvc_trace_param & flag) \
			printk(KERN_DEBUG "uvcvideo: " msg); \
	} while (0)

#define uvc_printk(level, msg...) \
	printk(level "uvcvideo: " msg)

#define UVC_GUID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \
			"%02x%02x%02x%02x%02x%02x"
#define UVC_GUID_ARGS(guid) \
	(guid)[3],  (guid)[2],  (guid)[1],  (guid)[0], \
	(guid)[5],  (guid)[4], \
	(guid)[7],  (guid)[6], \
	(guid)[8],  (guid)[9], \
	(guid)[10], (guid)[11], (guid)[12], \
	(guid)[13], (guid)[14], (guid)[15]

/* --------------------------------------------------------------------------
 * Internal functions.
 */

/* Core driver */
extern struct uvc_driver uvc_driver;
extern void uvc_delete(struct kref *kref);

/* Video buffers queue management. */
extern void uvc_queue_init(struct uvc_video_queue *queue);
extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
		unsigned int nbuffers, unsigned int buflength);
extern int 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 unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
		struct file *file, poll_table *wait);
static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
{
	return queue->flags & UVC_QUEUE_STREAMING;
}

/* V4L2 interface */
extern struct file_operations uvc_fops;

/* Video */
extern int uvc_video_init(struct uvc_video_device *video);
extern int uvc_video_suspend(struct uvc_video_device *video);
extern int uvc_video_resume(struct uvc_video_device *video);
extern int uvc_video_enable(struct uvc_video_device *video, int enable);
extern int uvc_probe_video(struct uvc_video_device *video,
		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);
extern int uvc_set_video_ctrl(struct uvc_video_device *video,
		struct uvc_streaming_control *ctrl, int probe);

/* Status */
extern int uvc_status_init(struct uvc_device *dev);
extern void uvc_status_cleanup(struct uvc_device *dev);
extern int uvc_status_suspend(struct uvc_device *dev);
extern int uvc_status_resume(struct uvc_device *dev);

/* Controls */
extern struct uvc_control *uvc_find_control(struct uvc_video_device *video,
		__u32 v4l2_id, struct uvc_control_mapping **mapping);
extern int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
		struct v4l2_queryctrl *v4l2_ctrl);

extern int uvc_ctrl_add_info(struct uvc_control_info *info);
extern int uvc_ctrl_add_mapping(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 void uvc_ctrl_init(void);

extern int uvc_ctrl_begin(struct uvc_video_device *video);
extern int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback);
static inline int uvc_ctrl_commit(struct uvc_video_device *video)
{
	return __uvc_ctrl_commit(video, 0);
}
static inline int uvc_ctrl_rollback(struct uvc_video_device *video)
{
	return __uvc_ctrl_commit(video, 1);
}

extern int uvc_ctrl_get(struct uvc_video_device *video,
		struct v4l2_ext_control *xctrl);
extern int uvc_ctrl_set(struct uvc_video_device *video,
		struct v4l2_ext_control *xctrl);

extern int uvc_xu_ctrl_query(struct uvc_video_device *video,
		struct uvc_xu_control *ctrl, int set);

/* 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_video_device *video,
		struct uvc_buffer *buf);

#endif /* __KERNEL__ */

#endif