2 * Memory-to-memory device framework for Video for Linux 2.
4 * Helper functions for devices that use memory buffers for both source
7 * Copyright (c) 2009 Samsung Electronics Co., Ltd.
8 * Pawel Osciak, <pawel@osciak.com>
9 * Marek Szyprowski, <m.szyprowski@samsung.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the
14 * License, or (at your option) any later version
17 #ifndef _MEDIA_V4L2_MEM2MEM_H
18 #define _MEDIA_V4L2_MEM2MEM_H
20 #include <media/videobuf2-core.h>
23 * struct v4l2_m2m_ops - mem-to-mem device driver callbacks
24 * @device_run: required. Begin the actual job (transaction) inside this
26 * The job does NOT have to end before this callback returns
27 * (and it will be the usual case). When the job finishes,
28 * v4l2_m2m_job_finish() has to be called.
29 * @job_ready: optional. Should return 0 if the driver does not have a job
30 * fully prepared to run yet (i.e. it will not be able to finish a
31 * transaction without sleeping). If not provided, it will be
32 * assumed that one source and one destination buffer are all
33 * that is required for the driver to perform one full transaction.
34 * This method may not sleep.
35 * @job_abort: required. Informs the driver that it has to abort the currently
36 * running transaction as soon as possible (i.e. as soon as it can
37 * stop the device safely; e.g. in the next interrupt handler),
38 * even if the transaction would not have been finished by then.
39 * After the driver performs the necessary steps, it has to call
40 * v4l2_m2m_job_finish() (as if the transaction ended normally).
41 * This function does not have to (and will usually not) wait
42 * until the device enters a state when it can be stopped.
45 void (*device_run)(void *priv);
46 int (*job_ready)(void *priv);
47 void (*job_abort)(void *priv);
48 void (*lock)(void *priv);
49 void (*unlock)(void *priv);
54 struct v4l2_m2m_queue_ctx {
55 /* private: internal use only */
58 /* Queue for buffers ready to be processed as soon as this
59 * instance receives access to the device */
60 struct list_head rdy_queue;
61 spinlock_t rdy_spinlock;
67 /* private: internal use only */
68 struct v4l2_m2m_dev *m2m_dev;
70 /* Capture (output to memory) queue context */
71 struct v4l2_m2m_queue_ctx cap_q_ctx;
73 /* Output (input from memory) queue context */
74 struct v4l2_m2m_queue_ctx out_q_ctx;
76 /* For device job queue */
77 struct list_head queue;
78 unsigned long job_flags;
79 wait_queue_head_t finished;
81 /* Instance private data */
85 struct v4l2_m2m_buffer {
87 struct list_head list;
90 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
92 struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
93 enum v4l2_buf_type type);
95 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
96 struct v4l2_m2m_ctx *m2m_ctx);
99 v4l2_m2m_buf_done(struct vb2_buffer *buf, enum vb2_buffer_state state)
101 vb2_buffer_done(buf, state);
104 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
105 struct v4l2_requestbuffers *reqbufs);
107 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
108 struct v4l2_buffer *buf);
110 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
111 struct v4l2_buffer *buf);
112 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
113 struct v4l2_buffer *buf);
114 int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
115 struct v4l2_create_buffers *create);
117 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
118 struct v4l2_exportbuffer *eb);
120 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
121 enum v4l2_buf_type type);
122 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
123 enum v4l2_buf_type type);
125 unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
126 struct poll_table_struct *wait);
128 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
129 struct vm_area_struct *vma);
131 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops);
132 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
134 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
136 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
138 static inline void v4l2_m2m_set_src_buffered(struct v4l2_m2m_ctx *m2m_ctx,
141 m2m_ctx->out_q_ctx.buffered = buffered;
144 static inline void v4l2_m2m_set_dst_buffered(struct v4l2_m2m_ctx *m2m_ctx,
147 m2m_ctx->cap_q_ctx.buffered = buffered;
150 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
152 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb);
155 * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
159 unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
161 return m2m_ctx->out_q_ctx.num_rdy;
165 * v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers
169 unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
171 return m2m_ctx->cap_q_ctx.num_rdy;
174 void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
177 * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
180 static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
182 return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx);
186 * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
189 static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
191 return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx);
195 * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
198 struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
200 return &m2m_ctx->out_q_ctx.q;
204 * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers
207 struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
209 return &m2m_ctx->cap_q_ctx.q;
212 void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
215 * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
216 * buffers and return it
218 static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
220 return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx);
224 * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
225 * ready buffers and return it
227 static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
229 return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx);
232 #endif /* _MEDIA_V4L2_MEM2MEM_H */