diff options
Diffstat (limited to 'drivers/usb/gadget/function/uvc_queue.h')
-rw-r--r-- | drivers/usb/gadget/function/uvc_queue.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/uvc_queue.h b/drivers/usb/gadget/function/uvc_queue.h new file mode 100644 index 0000000000..41f87b917f --- /dev/null +++ b/drivers/usb/gadget/function/uvc_queue.h @@ -0,0 +1,101 @@ +/* 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; + struct sg_table *sgt; + struct scatterlist *sg; + unsigned int offset; + unsigned int length; + unsigned int bytesused; +}; + +#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_ */ + |