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Diffstat (limited to 'include')
| -rw-r--r-- | include/media/v4l2-mem2mem.h | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h new file mode 100644 index 000000000000..8d149f1c58d0 --- /dev/null +++ b/include/media/v4l2-mem2mem.h @@ -0,0 +1,201 @@ +/* + * Memory-to-memory device framework for Video for Linux 2. + * + * Helper functions for devices that use memory buffers for both source + * and destination. + * + * Copyright (c) 2009 Samsung Electronics Co., Ltd. + * Pawel Osciak, <p.osciak@samsung.com> + * Marek Szyprowski, <m.szyprowski@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the + * License, or (at your option) any later version + */ + +#ifndef _MEDIA_V4L2_MEM2MEM_H +#define _MEDIA_V4L2_MEM2MEM_H + +#include <media/videobuf-core.h> + +/** + * struct v4l2_m2m_ops - mem-to-mem device driver callbacks + * @device_run: required. Begin the actual job (transaction) inside this + * callback. + * The job does NOT have to end before this callback returns + * (and it will be the usual case). When the job finishes, + * v4l2_m2m_job_finish() has to be called. + * @job_ready: optional. Should return 0 if the driver does not have a job + * fully prepared to run yet (i.e. it will not be able to finish a + * transaction without sleeping). If not provided, it will be + * assumed that one source and one destination buffer are all + * that is required for the driver to perform one full transaction. + * This method may not sleep. + * @job_abort: required. Informs the driver that it has to abort the currently + * running transaction as soon as possible (i.e. as soon as it can + * stop the device safely; e.g. in the next interrupt handler), + * even if the transaction would not have been finished by then. + * After the driver performs the necessary steps, it has to call + * v4l2_m2m_job_finish() (as if the transaction ended normally). + * This function does not have to (and will usually not) wait + * until the device enters a state when it can be stopped. + */ +struct v4l2_m2m_ops { + void (*device_run)(void *priv); + int (*job_ready)(void *priv); + void (*job_abort)(void *priv); +}; + +struct v4l2_m2m_dev; + +struct v4l2_m2m_queue_ctx { +/* private: internal use only */ + struct videobuf_queue q; + + /* Queue for buffers ready to be processed as soon as this + * instance receives access to the device */ + struct list_head rdy_queue; + u8 num_rdy; +}; + +struct v4l2_m2m_ctx { +/* private: internal use only */ + struct v4l2_m2m_dev *m2m_dev; + + /* Capture (output to memory) queue context */ + struct v4l2_m2m_queue_ctx cap_q_ctx; + + /* Output (input from memory) queue context */ + struct v4l2_m2m_queue_ctx out_q_ctx; + + /* For device job queue */ + struct list_head queue; + unsigned long job_flags; + + /* Instance private data */ + void *priv; +}; + +void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev); + +struct videobuf_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type); + +void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, + struct v4l2_m2m_ctx *m2m_ctx); + +int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_requestbuffers *reqbufs); + +int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_buffer *buf); + +int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_buffer *buf); +int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct v4l2_buffer *buf); + +int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type); +int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type); + +unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct poll_table_struct *wait); + +int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, + struct vm_area_struct *vma); + +struct v4l2_m2m_dev *v4l2_m2m_init(struct v4l2_m2m_ops *m2m_ops); +void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev); + +struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(void *priv, struct v4l2_m2m_dev *m2m_dev, + void (*vq_init)(void *priv, struct videobuf_queue *, + enum v4l2_buf_type)); +void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx); + +void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct videobuf_queue *vq, + struct videobuf_buffer *vb); + +/** + * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for + * use + */ +static inline +unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx) +{ + return m2m_ctx->cap_q_ctx.num_rdy; +} + +/** + * v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers + * ready for use + */ +static inline +unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx) +{ + return m2m_ctx->out_q_ctx.num_rdy; +} + +void *v4l2_m2m_next_buf(struct v4l2_m2m_ctx *m2m_ctx, enum v4l2_buf_type type); + +/** + * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready + * buffers + */ +static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_next_buf(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); +} + +/** + * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of + * ready buffers + */ +static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_next_buf(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE); +} + +/** + * v4l2_m2m_get_src_vq() - return videobuf_queue for source buffers + */ +static inline +struct videobuf_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_get_vq(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); +} + +/** + * v4l2_m2m_get_dst_vq() - return videobuf_queue for destination buffers + */ +static inline +struct videobuf_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_get_vq(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE); +} + +void *v4l2_m2m_buf_remove(struct v4l2_m2m_ctx *m2m_ctx, + enum v4l2_buf_type type); + +/** + * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready + * buffers and return it + */ +static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_buf_remove(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); +} + +/** + * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of + * ready buffers and return it + */ +static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx) +{ + return v4l2_m2m_buf_remove(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE); +} + +#endif /* _MEDIA_V4L2_MEM2MEM_H */ + |