102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _UVC_QUEUE_H_
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#define _UVC_QUEUE_H_
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#include <linux/list.h>
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#include <linux/poll.h>
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#include <linux/spinlock.h>
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#include <media/videobuf2-v4l2.h>
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struct file;
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struct mutex;
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/* Maximum frame size in bytes, for sanity checking. */
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#define UVC_MAX_FRAME_SIZE (16*1024*1024)
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/* Maximum number of video buffers. */
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#define UVC_MAX_VIDEO_BUFFERS 32
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/* ------------------------------------------------------------------------
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* Structures.
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*/
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enum uvc_buffer_state {
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UVC_BUF_STATE_IDLE = 0,
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UVC_BUF_STATE_QUEUED = 1,
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UVC_BUF_STATE_ACTIVE = 2,
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UVC_BUF_STATE_DONE = 3,
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UVC_BUF_STATE_ERROR = 4,
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};
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struct uvc_buffer {
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struct vb2_v4l2_buffer buf;
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struct list_head queue;
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enum uvc_buffer_state state;
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void *mem;
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struct sg_table *sgt;
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struct scatterlist *sg;
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unsigned int offset;
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unsigned int length;
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unsigned int bytesused;
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};
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#define UVC_QUEUE_DISCONNECTED (1 << 0)
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#define UVC_QUEUE_DROP_INCOMPLETE (1 << 1)
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struct uvc_video_queue {
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struct vb2_queue queue;
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unsigned int flags;
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__u32 sequence;
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unsigned int buf_used;
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bool use_sg;
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spinlock_t irqlock; /* Protects flags and irqqueue */
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struct list_head irqqueue;
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};
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static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
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{
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return vb2_is_streaming(&queue->queue);
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}
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int uvcg_queue_init(struct uvc_video_queue *queue, struct device *dev, enum v4l2_buf_type type,
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struct mutex *lock);
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void uvcg_free_buffers(struct uvc_video_queue *queue);
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int uvcg_alloc_buffers(struct uvc_video_queue *queue,
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struct v4l2_requestbuffers *rb);
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int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
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int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
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int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
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struct v4l2_buffer *buf, int nonblocking);
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__poll_t uvcg_queue_poll(struct uvc_video_queue *queue,
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struct file *file, poll_table *wait);
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int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
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#ifndef CONFIG_MMU
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unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
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unsigned long pgoff);
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#endif /* CONFIG_MMU */
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void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
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int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
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void uvcg_complete_buffer(struct uvc_video_queue *queue,
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struct uvc_buffer *buf);
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struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
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#endif /* _UVC_QUEUE_H_ */
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