drivers/usb/gadget/function/uvc_queue.h

Source file repositories/reference/linux-study-clean/drivers/usb/gadget/function/uvc_queue.h

File Facts

System
Linux kernel
Corpus path
drivers/usb/gadget/function/uvc_queue.h
Extension
.h
Size
2577 bytes
Lines
104
Domain
Driver Families
Bucket
drivers/usb
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct uvc_buffer {
	struct vb2_v4l2_buffer buf;
	struct list_head queue;

	enum uvc_buffer_state state;
	void *mem;
	struct sg_table *sgt;
	struct scatterlist *sg;
	unsigned int offset;
	unsigned int length;
	unsigned int bytesused;
	/* req_payload_size: only used with isoc */
	unsigned int req_payload_size;
};

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

struct uvc_video_queue {
	struct vb2_queue queue;

	unsigned int flags;
	__u32 sequence;

	unsigned int buf_used;

	bool use_sg;

	spinlock_t irqlock;	/* Protects flags and irqqueue */
	struct list_head irqqueue;
};

static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
{
	return vb2_is_streaming(&queue->queue);
}

int uvcg_queue_init(struct uvc_video_queue *queue, struct device *dev, enum v4l2_buf_type type,
		    struct mutex *lock);

void uvcg_free_buffers(struct uvc_video_queue *queue);

int uvcg_alloc_buffers(struct uvc_video_queue *queue,
		       struct v4l2_requestbuffers *rb);

int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);

int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);

int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
			struct v4l2_buffer *buf, int nonblocking);

__poll_t uvcg_queue_poll(struct uvc_video_queue *queue,
			     struct file *file, poll_table *wait);

int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);

#ifndef CONFIG_MMU
unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
					   unsigned long pgoff);
#endif /* CONFIG_MMU */

void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);

int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);

void uvcg_complete_buffer(struct uvc_video_queue *queue,
					  struct uvc_buffer *buf);

struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);

#endif /* _UVC_QUEUE_H_ */

Annotation

Implementation Notes