202 lines
6.2 KiB
C
202 lines
6.2 KiB
C
/*
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* Memory-to-memory device framework for Video for Linux 2.
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*
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* Helper functions for devices that use memory buffers for both source
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* and destination.
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*
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* Copyright (c) 2009 Samsung Electronics Co., Ltd.
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* Pawel Osciak, <p.osciak@samsung.com>
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* Marek Szyprowski, <m.szyprowski@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version
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*/
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#ifndef _MEDIA_V4L2_MEM2MEM_H
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#define _MEDIA_V4L2_MEM2MEM_H
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#include <media/videobuf-core.h>
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/**
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* struct v4l2_m2m_ops - mem-to-mem device driver callbacks
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* @device_run: required. Begin the actual job (transaction) inside this
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* callback.
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* The job does NOT have to end before this callback returns
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* (and it will be the usual case). When the job finishes,
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* v4l2_m2m_job_finish() has to be called.
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* @job_ready: optional. Should return 0 if the driver does not have a job
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* fully prepared to run yet (i.e. it will not be able to finish a
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* transaction without sleeping). If not provided, it will be
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* assumed that one source and one destination buffer are all
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* that is required for the driver to perform one full transaction.
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* This method may not sleep.
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* @job_abort: required. Informs the driver that it has to abort the currently
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* running transaction as soon as possible (i.e. as soon as it can
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* stop the device safely; e.g. in the next interrupt handler),
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* even if the transaction would not have been finished by then.
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* After the driver performs the necessary steps, it has to call
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* v4l2_m2m_job_finish() (as if the transaction ended normally).
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* This function does not have to (and will usually not) wait
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* until the device enters a state when it can be stopped.
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*/
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struct v4l2_m2m_ops {
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void (*device_run)(void *priv);
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int (*job_ready)(void *priv);
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void (*job_abort)(void *priv);
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};
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struct v4l2_m2m_dev;
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struct v4l2_m2m_queue_ctx {
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/* private: internal use only */
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struct videobuf_queue q;
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/* Queue for buffers ready to be processed as soon as this
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* instance receives access to the device */
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struct list_head rdy_queue;
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u8 num_rdy;
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};
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struct v4l2_m2m_ctx {
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/* private: internal use only */
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struct v4l2_m2m_dev *m2m_dev;
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/* Capture (output to memory) queue context */
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struct v4l2_m2m_queue_ctx cap_q_ctx;
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/* Output (input from memory) queue context */
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struct v4l2_m2m_queue_ctx out_q_ctx;
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/* For device job queue */
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struct list_head queue;
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unsigned long job_flags;
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/* Instance private data */
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void *priv;
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};
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void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
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struct videobuf_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
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enum v4l2_buf_type type);
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void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
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struct v4l2_m2m_ctx *m2m_ctx);
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int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_requestbuffers *reqbufs);
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int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_buffer *buf);
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int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_buffer *buf);
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int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_buffer *buf);
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int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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enum v4l2_buf_type type);
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int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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enum v4l2_buf_type type);
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unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct poll_table_struct *wait);
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int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct vm_area_struct *vma);
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struct v4l2_m2m_dev *v4l2_m2m_init(struct v4l2_m2m_ops *m2m_ops);
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void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
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struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(void *priv, struct v4l2_m2m_dev *m2m_dev,
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void (*vq_init)(void *priv, struct videobuf_queue *,
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enum v4l2_buf_type));
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void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
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void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct videobuf_queue *vq,
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struct videobuf_buffer *vb);
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/**
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* v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
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* use
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*/
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static inline
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unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
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{
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return m2m_ctx->cap_q_ctx.num_rdy;
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}
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/**
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* v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers
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* ready for use
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*/
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static inline
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unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
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{
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return m2m_ctx->out_q_ctx.num_rdy;
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}
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void *v4l2_m2m_next_buf(struct v4l2_m2m_ctx *m2m_ctx, enum v4l2_buf_type type);
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/**
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* v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
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* buffers
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*/
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static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
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{
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return v4l2_m2m_next_buf(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
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}
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/**
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* v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
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* ready buffers
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*/
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static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
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{
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return v4l2_m2m_next_buf(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
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}
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/**
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* v4l2_m2m_get_src_vq() - return videobuf_queue for source buffers
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*/
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static inline
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struct videobuf_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
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{
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return v4l2_m2m_get_vq(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
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}
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/**
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* v4l2_m2m_get_dst_vq() - return videobuf_queue for destination buffers
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*/
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static inline
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struct videobuf_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
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{
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return v4l2_m2m_get_vq(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
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}
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void *v4l2_m2m_buf_remove(struct v4l2_m2m_ctx *m2m_ctx,
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enum v4l2_buf_type type);
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/**
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* v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
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* buffers and return it
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*/
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static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
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{
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return v4l2_m2m_buf_remove(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
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}
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/**
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* v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
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* ready buffers and return it
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*/
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static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
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{
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return v4l2_m2m_buf_remove(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
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}
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#endif /* _MEDIA_V4L2_MEM2MEM_H */
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