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[media] v4l2-mem2mem.h: move descriptions from .c file
Several routines are somewhat documented at v4l2-mem2mem.c file. Move what's there to the header file. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab
parent
82631b5bb2
commit
4781646c1e
@ -76,9 +76,6 @@ static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx,
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return &m2m_ctx->cap_q_ctx;
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}
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/**
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* v4l2_m2m_get_vq() - return vb2_queue for the given type
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*/
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struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
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enum v4l2_buf_type type)
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{
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@ -92,9 +89,6 @@ struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL(v4l2_m2m_get_vq);
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/**
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* v4l2_m2m_next_buf() - return next buffer from the list of ready buffers
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*/
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void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
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{
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struct v4l2_m2m_buffer *b;
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@ -113,10 +107,6 @@ void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf);
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/**
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* v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and
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* return it
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*/
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void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
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{
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struct v4l2_m2m_buffer *b;
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@ -140,10 +130,6 @@ EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove);
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* Scheduling handlers
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*/
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/**
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* v4l2_m2m_get_curr_priv() - return driver private data for the currently
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* running instance or NULL if no instance is running
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*/
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void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev)
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{
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unsigned long flags;
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@ -188,26 +174,6 @@ static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev)
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m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv);
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}
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/**
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* v4l2_m2m_try_schedule() - check whether an instance is ready to be added to
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* the pending job queue and add it if so.
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* @m2m_ctx: m2m context assigned to the instance to be checked
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*
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* There are three basic requirements an instance has to meet to be able to run:
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* 1) at least one source buffer has to be queued,
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* 2) at least one destination buffer has to be queued,
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* 3) streaming has to be on.
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*
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* If a queue is buffered (for example a decoder hardware ringbuffer that has
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* to be drained before doing streamoff), allow scheduling without v4l2 buffers
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* on that queue.
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*
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* There may also be additional, custom requirements. In such case the driver
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* should supply a custom callback (job_ready in v4l2_m2m_ops) that should
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* return 1 if the instance is ready.
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* An example of the above could be an instance that requires more than one
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* src/dst buffer per transaction.
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*/
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void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
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{
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struct v4l2_m2m_dev *m2m_dev;
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@ -311,18 +277,6 @@ static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
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}
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}
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/**
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* v4l2_m2m_job_finish() - inform the framework that a job has been finished
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* and have it clean up
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*
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* Called by a driver to yield back the device after it has finished with it.
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* Should be called as soon as possible after reaching a state which allows
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* other instances to take control of the device.
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*
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* This function has to be called only after device_run() callback has been
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* called on the driver. To prevent recursion, it should not be called directly
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* from the device_run() callback though.
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*/
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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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{
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@ -350,9 +304,6 @@ void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
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}
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EXPORT_SYMBOL(v4l2_m2m_job_finish);
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/**
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* v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
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*/
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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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{
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@ -370,11 +321,6 @@ int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs);
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/**
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* v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer
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*
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* See v4l2_m2m_mmap() documentation for details.
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*/
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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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{
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@ -400,10 +346,6 @@ int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf);
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/**
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* v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on
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* the type
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*/
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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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{
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@ -419,10 +361,6 @@ int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf);
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/**
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* v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on
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* the type
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*/
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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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{
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@ -433,10 +371,6 @@ int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);
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/**
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* v4l2_m2m_prepare_buf() - prepare a source or destination buffer, depending on
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* the type
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*/
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int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_buffer *buf)
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{
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@ -452,10 +386,6 @@ int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
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/**
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* v4l2_m2m_create_bufs() - create a source or destination buffer, depending
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* on the type
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*/
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int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_create_buffers *create)
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{
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@ -466,10 +396,6 @@ int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs);
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/**
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* v4l2_m2m_expbuf() - export a source or destination buffer, depending on
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* the type
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*/
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int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_exportbuffer *eb)
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{
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@ -479,9 +405,7 @@ int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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return vb2_expbuf(vq, eb);
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf);
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/**
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* v4l2_m2m_streamon() - turn on streaming for a video queue
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*/
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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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{
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@ -497,9 +421,6 @@ int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_streamon);
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/**
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* v4l2_m2m_streamoff() - turn off streaming for a video queue
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*/
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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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{
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@ -540,14 +461,6 @@ int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff);
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/**
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* v4l2_m2m_poll() - poll replacement, for destination buffers only
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*
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* Call from the driver's poll() function. Will poll both queues. If a buffer
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* is available to dequeue (with dqbuf) from the source queue, this will
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* indicate that a non-blocking write can be performed, while read will be
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* returned in case of the destination queue.
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*/
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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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{
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@ -626,16 +539,6 @@ unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_poll);
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/**
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* v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer
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*
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* Call from driver's mmap() function. Will handle mmap() for both queues
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* seamlessly for videobuffer, which will receive normal per-queue offsets and
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* proper videobuf queue pointers. The differentiation is made outside videobuf
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* by adding a predefined offset to buffers from one of the queues and
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* subtracting it before passing it back to videobuf. Only drivers (and
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* thus applications) receive modified offsets.
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*/
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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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{
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@ -653,11 +556,6 @@ int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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}
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EXPORT_SYMBOL(v4l2_m2m_mmap);
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/**
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* v4l2_m2m_init() - initialize per-driver m2m data
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*
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* Usually called from driver's probe() function.
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*/
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struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
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{
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struct v4l2_m2m_dev *m2m_dev;
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@ -679,26 +577,12 @@ struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_init);
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/**
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* v4l2_m2m_release() - cleans up and frees a m2m_dev structure
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*
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* Usually called from driver's remove() function.
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*/
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void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev)
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{
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kfree(m2m_dev);
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_release);
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/**
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* v4l2_m2m_ctx_init() - allocate and initialize a m2m context
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* @priv - driver's instance private data
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* @m2m_dev - a previously initialized m2m_dev struct
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* @vq_init - a callback for queue type-specific initialization function to be
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* used for initializing videobuf_queues
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*
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* Usually called from driver's open() function.
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*/
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struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
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void *drv_priv,
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int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq))
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@ -744,11 +628,6 @@ struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init);
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/**
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* v4l2_m2m_ctx_release() - release m2m context
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*
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* Usually called from driver's release() function.
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*/
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void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx)
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{
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/* wait until the current context is dequeued from job_queue */
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@ -761,11 +640,6 @@ void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx)
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}
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EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release);
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/**
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* v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list.
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*
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* Call from buf_queue(), videobuf_queue_ops callback.
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*/
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void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
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struct vb2_v4l2_buffer *vbuf)
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{
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@ -94,13 +94,52 @@ struct v4l2_m2m_buffer {
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struct list_head list;
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};
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/**
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* v4l2_m2m_get_curr_priv() - return driver private data for the currently
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* running instance or NULL if no instance is running
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*/
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void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
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/**
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* v4l2_m2m_get_vq() - return vb2_queue for the given type
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*/
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struct vb2_queue *v4l2_m2m_get_vq(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_try_schedule() - check whether an instance is ready to be added to
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* the pending job queue and add it if so.
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* @m2m_ctx: m2m context assigned to the instance to be checked
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*
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* There are three basic requirements an instance has to meet to be able to run:
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* 1) at least one source buffer has to be queued,
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* 2) at least one destination buffer has to be queued,
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* 3) streaming has to be on.
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*
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* If a queue is buffered (for example a decoder hardware ringbuffer that has
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* to be drained before doing streamoff), allow scheduling without v4l2 buffers
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* on that queue.
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*
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* There may also be additional, custom requirements. In such case the driver
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* should supply a custom callback (job_ready in v4l2_m2m_ops) that should
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* return 1 if the instance is ready.
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* An example of the above could be an instance that requires more than one
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* src/dst buffer per transaction.
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*/
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void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx);
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/**
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* v4l2_m2m_job_finish() - inform the framework that a job has been finished
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* and have it clean up
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*
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* Called by a driver to yield back the device after it has finished with it.
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* Should be called as soon as possible after reaching a state which allows
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* other instances to take control of the device.
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*
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* This function has to be called only after device_run() callback has been
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* called on the driver. To prevent recursion, it should not be called directly
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* from the device_run() callback though.
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*/
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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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@ -110,38 +149,114 @@ v4l2_m2m_buf_done(struct vb2_v4l2_buffer *buf, enum vb2_buffer_state state)
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vb2_buffer_done(&buf->vb2_buf, state);
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}
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/**
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* v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
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*/
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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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/**
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* v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer
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*
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* See v4l2_m2m_mmap() documentation for details.
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*/
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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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/**
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* v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on
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* the type
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*/
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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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/**
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* v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on
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* the type
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*/
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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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/**
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* v4l2_m2m_prepare_buf() - prepare a source or destination buffer, depending on
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* the type
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*/
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int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
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struct v4l2_buffer *buf);
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/**
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||||
* v4l2_m2m_create_bufs() - create a source or destination buffer, depending
|
||||
* on the type
|
||||
*/
|
||||
int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
|
||||
struct v4l2_create_buffers *create);
|
||||
|
||||
/**
|
||||
* v4l2_m2m_expbuf() - export a source or destination buffer, depending on
|
||||
* the type
|
||||
*/
|
||||
int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
|
||||
struct v4l2_exportbuffer *eb);
|
||||
|
||||
/**
|
||||
* v4l2_m2m_streamon() - turn on streaming for a video queue
|
||||
*/
|
||||
int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
|
||||
enum v4l2_buf_type type);
|
||||
|
||||
/**
|
||||
* v4l2_m2m_streamoff() - turn off streaming for a video queue
|
||||
*/
|
||||
int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
|
||||
enum v4l2_buf_type type);
|
||||
|
||||
/**
|
||||
* v4l2_m2m_poll() - poll replacement, for destination buffers only
|
||||
*
|
||||
* Call from the driver's poll() function. Will poll both queues. If a buffer
|
||||
* is available to dequeue (with dqbuf) from the source queue, this will
|
||||
* indicate that a non-blocking write can be performed, while read will be
|
||||
* returned in case of the destination queue.
|
||||
*/
|
||||
unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
|
||||
struct poll_table_struct *wait);
|
||||
|
||||
/**
|
||||
* v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer
|
||||
*
|
||||
* Call from driver's mmap() function. Will handle mmap() for both queues
|
||||
* seamlessly for videobuffer, which will receive normal per-queue offsets and
|
||||
* proper videobuf queue pointers. The differentiation is made outside videobuf
|
||||
* by adding a predefined offset to buffers from one of the queues and
|
||||
* subtracting it before passing it back to videobuf. Only drivers (and
|
||||
* thus applications) receive modified offsets.
|
||||
*/
|
||||
int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
|
||||
struct vm_area_struct *vma);
|
||||
|
||||
/**
|
||||
* v4l2_m2m_init() - initialize per-driver m2m data
|
||||
*
|
||||
* Usually called from driver's probe() function.
|
||||
*/
|
||||
struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops);
|
||||
|
||||
/**
|
||||
* v4l2_m2m_release() - cleans up and frees a m2m_dev structure
|
||||
*
|
||||
* Usually called from driver's remove() function.
|
||||
*/
|
||||
void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
|
||||
|
||||
/**
|
||||
* v4l2_m2m_ctx_init() - allocate and initialize a m2m context
|
||||
* @priv - driver's instance private data
|
||||
* @m2m_dev - a previously initialized m2m_dev struct
|
||||
* @vq_init - a callback for queue type-specific initialization function to be
|
||||
* used for initializing videobuf_queues
|
||||
*
|
||||
* Usually called from driver's open() function.
|
||||
*/
|
||||
struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
|
||||
void *drv_priv,
|
||||
int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
|
||||
@ -158,8 +273,18 @@ static inline void v4l2_m2m_set_dst_buffered(struct v4l2_m2m_ctx *m2m_ctx,
|
||||
m2m_ctx->cap_q_ctx.buffered = buffered;
|
||||
}
|
||||
|
||||
/**
|
||||
* v4l2_m2m_ctx_release() - release m2m context
|
||||
*
|
||||
* Usually called from driver's release() function.
|
||||
*/
|
||||
void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
|
||||
|
||||
/**
|
||||
* v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list.
|
||||
*
|
||||
* Call from buf_queue(), videobuf_queue_ops callback.
|
||||
*/
|
||||
void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
|
||||
struct vb2_v4l2_buffer *vbuf);
|
||||
|
||||
@ -187,6 +312,9 @@ unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
|
||||
return m2m_ctx->cap_q_ctx.num_rdy;
|
||||
}
|
||||
|
||||
/**
|
||||
* v4l2_m2m_next_buf() - return next buffer from the list of ready buffers
|
||||
*/
|
||||
void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
|
||||
|
||||
/**
|
||||
@ -233,6 +361,10 @@ struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
|
||||
return &m2m_ctx->cap_q_ctx.q;
|
||||
}
|
||||
|
||||
/**
|
||||
* v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and
|
||||
* return it
|
||||
*/
|
||||
void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
|
||||
|
||||
/**
|
||||
|
||||
Loading…
Reference in New Issue
Block a user