* This function does not have to (and will usually not) wait
* until the device enters a state when it can be stopped.
* @lock: optional. Define a driver's own lock callback, instead of using
- * m2m_ctx->q_lock.
+ * &v4l2_m2m_ctx->q_lock.
* @unlock: optional. Define a driver's own unlock callback, instead of
- * using m2m_ctx->q_lock.
+ * using &v4l2_m2m_ctx->q_lock.
*/
struct v4l2_m2m_ops {
void (*device_run)(void *priv);
struct v4l2_m2m_dev;
+/**
+ * struct v4l2_m2m_queue_ctx - represents a queue for buffers ready to be
+ * processed
+ *
+ * @q: pointer to struct &vb2_queue
+ * @rdy_queue: List of V4L2 mem-to-mem queues
+ * @rdy_spinlock: spin lock to protect the struct usage
+ * @num_rdy: number of buffers ready to be processed
+ * @buffered: is the queue buffered?
+ *
+ * Queue for buffers ready to be processed as soon as this
+ * instance receives access to the device.
+ */
+
struct v4l2_m2m_queue_ctx {
-/* private: internal use only */
struct vb2_queue q;
- /* Queue for buffers ready to be processed as soon as this
- * instance receives access to the device */
struct list_head rdy_queue;
spinlock_t rdy_spinlock;
u8 num_rdy;
bool buffered;
};
+/**
+ * struct v4l2_m2m_ctx - Memory to memory context structure
+ *
+ * @q_lock: struct &mutex lock
+ * @m2m_dev: opaque pointer to the internal data to handle M2M context
+ * @cap_q_ctx: Capture (output to memory) queue context
+ * @out_q_ctx: Output (input from memory) queue context
+ * @queue: List of memory to memory contexts
+ * @job_flags: Job queue flags, used internally by v4l2-mem2mem.c:
+ * %TRANS_QUEUED, %TRANS_RUNNING and %TRANS_ABORT.
+ * @finished: Wait queue used to signalize when a job queue finished.
+ * @priv: Instance private data
+ */
struct v4l2_m2m_ctx {
/* optional cap/out vb2 queues lock */
struct mutex *q_lock;
-/* private: internal use only */
+ /* 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 */
unsigned long job_flags;
wait_queue_head_t finished;
- /* Instance private data */
void *priv;
};
+/**
+ * struct v4l2_m2m_buffer - Memory to memory buffer
+ *
+ * @vb: pointer to struct &vb2_v4l2_buffer
+ * @list: list of m2m buffers
+ */
struct v4l2_m2m_buffer {
struct vb2_v4l2_buffer vb;
struct list_head list;
/**
* v4l2_m2m_get_curr_priv() - return driver private data for the currently
* running instance or NULL if no instance is running
+ *
+ * @m2m_dev: opaque pointer to the internal data to handle M2M context
*/
void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
/**
* v4l2_m2m_get_vq() - return vb2_queue for the given type
+ *
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
*/
struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
enum v4l2_buf_type type);
/**
* v4l2_m2m_try_schedule() - check whether an instance is ready to be added to
* the pending job queue and add it if so.
- * @m2m_ctx: m2m context assigned to the instance to be checked
+ *
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*
* There are three basic requirements an instance has to meet to be able to run:
* 1) at least one source buffer has to be queued,
* v4l2_m2m_job_finish() - inform the framework that a job has been finished
* and have it clean up
*
+ * @m2m_dev: opaque pointer to the internal data to handle M2M context
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ *
* Called by a driver to yield back the device after it has finished with it.
* Should be called as soon as possible after reaching a state which allows
* other instances to take control of the device.
*
- * This function has to be called only after device_run() callback has been
- * called on the driver. To prevent recursion, it should not be called directly
- * from the device_run() callback though.
+ * This function has to be called only after &v4l2_m2m_ops->device_run
+ * callback has been called on the driver. To prevent recursion, it should
+ * not be called directly from the &v4l2_m2m_ops->device_run callback though.
*/
void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
struct v4l2_m2m_ctx *m2m_ctx);
/**
* v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
+ *
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @reqbufs: pointer to struct &v4l2_requestbuffers
*/
int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_requestbuffers *reqbufs);
/**
* v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer
*
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @buf: pointer to struct &v4l2_buffer
+ *
* See v4l2_m2m_mmap() documentation for details.
*/
int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
/**
* v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on
* the type
+ *
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @buf: pointer to struct &v4l2_buffer
*/
int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_buffer *buf);
/**
* v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on
* the type
+ *
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @buf: pointer to struct &v4l2_buffer
*/
int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_buffer *buf);
/**
* v4l2_m2m_prepare_buf() - prepare a source or destination buffer, depending on
* the type
+ *
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @buf: pointer to struct &v4l2_buffer
*/
int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
struct v4l2_buffer *buf);
/**
* v4l2_m2m_create_bufs() - create a source or destination buffer, depending
* on the type
+ *
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @create: pointer to struct &v4l2_create_buffers
*/
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
+ *
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @eb: pointer to struct &v4l2_exportbuffer
*/
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
+ *
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
*/
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
+ *
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
*/
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
*
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @wait: pointer to struct &poll_table_struct
+ *
* 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
/**
* v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer
*
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @vma: pointer to struct &vm_area_struct
+ *
* 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
/**
* v4l2_m2m_init() - initialize per-driver m2m data
*
- * Usually called from driver's probe() function.
+ * @m2m_ops: pointer to struct v4l2_m2m_ops
+ *
+ * Usually called from driver's ``probe()`` function.
+ *
+ * Return: returns an opaque pointer to the internal data to handle M2M context
*/
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.
+ * @m2m_dev: opaque pointer to the internal data to handle M2M context
+ *
+ * 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.
+ * @m2m_dev: opaque pointer to the internal data to handle M2M context
+ * @drv_priv: driver's instance private data
+ * @queue_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,
/**
* v4l2_m2m_ctx_release() - release m2m context
*
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ *
* 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.
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @vbuf: pointer to struct &vb2_v4l2_buffer
+ *
+ * Call from videobuf_queue_ops->ops->buf_queue, videobuf_queue_ops callback.
*/
void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
struct vb2_v4l2_buffer *vbuf);
* v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
* use
*
- * @m2m_ctx: pointer to struct v4l2_m2m_ctx
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*/
static inline
unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
}
/**
- * v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers
+ * v4l2_m2m_num_dst_bufs_ready() - return the number of destination buffers
* ready for use
*
- * @m2m_ctx: pointer to struct v4l2_m2m_ctx
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*/
static inline
unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
/**
* v4l2_m2m_next_buf() - return next buffer from the list of ready buffers
+ *
+ * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
*/
void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
* v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
* buffers
*
- * @m2m_ctx: pointer to struct v4l2_m2m_ctx
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*/
static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
{
* v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
* ready buffers
*
- * @m2m_ctx: pointer to struct v4l2_m2m_ctx
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*/
static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
{
/**
* v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
*
- * @m2m_ctx: pointer to struct v4l2_m2m_ctx
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*/
static inline
struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
/**
* v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers
*
- * @m2m_ctx: pointer to struct v4l2_m2m_ctx
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*/
static inline
struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
/**
* v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and
* return it
+ *
+ * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
*/
void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
* v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
* buffers and return it
*
- * @m2m_ctx: pointer to struct v4l2_m2m_ctx
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*/
static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
{
* v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
* ready buffers and return it
*
- * @m2m_ctx: pointer to struct v4l2_m2m_ctx
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*/
static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
{
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