/* 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	(16*1024*1024)/* Maximum number of video buffers. */#define UVC_MAX_VIDEO_BUFFERS	32 /* ------------------------------------------------------------------------ * Structures. */ 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 {	struct vb2_v4l2_buffer buf;	struct list_head queue; 	enum uvc_buffer_state state;	void *mem;	unsigned int length;	unsigned int bytesused;}; #define UVC_QUEUE_DISCONNECTED		(1 << 0)#define UVC_QUEUE_DROP_INCOMPLETE	(1 << 1)#define UVC_QUEUE_PAUSED		(1 << 2) struct uvc_video_queue {	struct vb2_queue queue; 	unsigned int flags;	__u32 sequence; 	unsigned int buf_used; 	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, 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_MMUunsigned 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); struct uvc_buffer *uvcg_queue_next_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_ */