linux/drivers/usb/gadget/function/uvc_queue.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _UVC_QUEUE_H_
#define _UVC_QUEUE_H_

#include <linux/list.h>
#include <linux/poll.h>
#include <linux/spinlock.h>

#include <media/videobuf2-v4l2.h>

struct file;
struct mutex;

/* Maximum frame size in bytes, for sanity checking. */
#define UVC_MAX_FRAME_SIZE …
/* Maximum number of video buffers. */
#define UVC_MAX_VIDEO_BUFFERS …

/* ------------------------------------------------------------------------
 * Structures.
 */

enum uvc_buffer_state { … };

struct uvc_buffer { … };

#define UVC_QUEUE_DISCONNECTED …
#define UVC_QUEUE_DROP_INCOMPLETE …

struct uvc_video_queue { … };

static inline int uvc_queue_streaming(struct uvc_video_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_ */