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Pawel Osciak7f986392010-04-23 05:38:37 -03001/*
2 * Memory-to-memory device framework for Video for Linux 2.
3 *
4 * Helper functions for devices that use memory buffers for both source
5 * and destination.
6 *
7 * Copyright (c) 2009 Samsung Electronics Co., Ltd.
Pawel Osciak95072082011-03-13 15:23:32 -03008 * Pawel Osciak, <pawel@osciak.com>
Pawel Osciak7f986392010-04-23 05:38:37 -03009 * Marek Szyprowski, <m.szyprowski@samsung.com>
10 *
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
15 */
16
17#ifndef _MEDIA_V4L2_MEM2MEM_H
18#define _MEDIA_V4L2_MEM2MEM_H
19
Marek Szyprowski908a0d72011-01-12 06:50:24 -030020#include <media/videobuf2-core.h>
Pawel Osciak7f986392010-04-23 05:38:37 -030021
22/**
23 * struct v4l2_m2m_ops - mem-to-mem device driver callbacks
24 * @device_run: required. Begin the actual job (transaction) inside this
25 * callback.
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.
43 */
44struct v4l2_m2m_ops {
45 void (*device_run)(void *priv);
46 int (*job_ready)(void *priv);
47 void (*job_abort)(void *priv);
Marek Szyprowski908a0d72011-01-12 06:50:24 -030048 void (*lock)(void *priv);
49 void (*unlock)(void *priv);
Pawel Osciak7f986392010-04-23 05:38:37 -030050};
51
52struct v4l2_m2m_dev;
53
54struct v4l2_m2m_queue_ctx {
55/* private: internal use only */
Marek Szyprowski908a0d72011-01-12 06:50:24 -030056 struct vb2_queue q;
Pawel Osciak7f986392010-04-23 05:38:37 -030057
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;
Marek Szyprowski908a0d72011-01-12 06:50:24 -030061 spinlock_t rdy_spinlock;
Pawel Osciak7f986392010-04-23 05:38:37 -030062 u8 num_rdy;
63};
64
65struct v4l2_m2m_ctx {
66/* private: internal use only */
67 struct v4l2_m2m_dev *m2m_dev;
68
69 /* Capture (output to memory) queue context */
70 struct v4l2_m2m_queue_ctx cap_q_ctx;
71
72 /* Output (input from memory) queue context */
73 struct v4l2_m2m_queue_ctx out_q_ctx;
74
75 /* For device job queue */
76 struct list_head queue;
77 unsigned long job_flags;
Marek Szyprowski908a0d72011-01-12 06:50:24 -030078 wait_queue_head_t finished;
Pawel Osciak7f986392010-04-23 05:38:37 -030079
80 /* Instance private data */
81 void *priv;
82};
83
Marek Szyprowski908a0d72011-01-12 06:50:24 -030084struct v4l2_m2m_buffer {
85 struct vb2_buffer vb;
86 struct list_head list;
87};
88
Pawel Osciak7f986392010-04-23 05:38:37 -030089void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
90
Marek Szyprowski908a0d72011-01-12 06:50:24 -030091struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
Pawel Osciak7f986392010-04-23 05:38:37 -030092 enum v4l2_buf_type type);
93
94void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
95 struct v4l2_m2m_ctx *m2m_ctx);
96
Marek Szyprowski908a0d72011-01-12 06:50:24 -030097static inline void
98v4l2_m2m_buf_done(struct vb2_buffer *buf, enum vb2_buffer_state state)
99{
100 vb2_buffer_done(buf, state);
101}
102
Pawel Osciak7f986392010-04-23 05:38:37 -0300103int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
104 struct v4l2_requestbuffers *reqbufs);
105
106int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
107 struct v4l2_buffer *buf);
108
109int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
110 struct v4l2_buffer *buf);
111int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
112 struct v4l2_buffer *buf);
113
Tomasz Stanislawski83ae7c52012-06-14 11:32:24 -0300114int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
115 struct v4l2_exportbuffer *eb);
116
Pawel Osciak7f986392010-04-23 05:38:37 -0300117int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
118 enum v4l2_buf_type type);
119int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
120 enum v4l2_buf_type type);
121
122unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
123 struct poll_table_struct *wait);
124
125int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
126 struct vm_area_struct *vma);
127
Guennadi Liakhovetskib1252eb2012-09-11 06:32:17 -0300128struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops);
Pawel Osciak7f986392010-04-23 05:38:37 -0300129void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
130
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300131struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
132 void *drv_priv,
133 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
134
Pawel Osciak7f986392010-04-23 05:38:37 -0300135void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
136
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300137void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb);
Pawel Osciak7f986392010-04-23 05:38:37 -0300138
139/**
140 * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
141 * use
142 */
143static inline
144unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
145{
Sascha Hauer961ae442012-08-31 09:18:04 -0300146 return m2m_ctx->out_q_ctx.num_rdy;
Pawel Osciak7f986392010-04-23 05:38:37 -0300147}
148
149/**
150 * v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers
151 * ready for use
152 */
153static inline
154unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
155{
Sascha Hauer961ae442012-08-31 09:18:04 -0300156 return m2m_ctx->cap_q_ctx.num_rdy;
Pawel Osciak7f986392010-04-23 05:38:37 -0300157}
158
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300159void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
Pawel Osciak7f986392010-04-23 05:38:37 -0300160
161/**
162 * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
163 * buffers
164 */
165static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
166{
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300167 return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx);
Pawel Osciak7f986392010-04-23 05:38:37 -0300168}
169
170/**
171 * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
172 * ready buffers
173 */
174static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
175{
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300176 return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx);
Pawel Osciak7f986392010-04-23 05:38:37 -0300177}
178
179/**
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300180 * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
Pawel Osciak7f986392010-04-23 05:38:37 -0300181 */
182static inline
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300183struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
Pawel Osciak7f986392010-04-23 05:38:37 -0300184{
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300185 return &m2m_ctx->out_q_ctx.q;
Pawel Osciak7f986392010-04-23 05:38:37 -0300186}
187
188/**
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300189 * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers
Pawel Osciak7f986392010-04-23 05:38:37 -0300190 */
191static inline
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300192struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
Pawel Osciak7f986392010-04-23 05:38:37 -0300193{
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300194 return &m2m_ctx->cap_q_ctx.q;
Pawel Osciak7f986392010-04-23 05:38:37 -0300195}
196
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300197void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
Pawel Osciak7f986392010-04-23 05:38:37 -0300198
199/**
200 * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
201 * buffers and return it
202 */
203static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
204{
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300205 return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx);
Pawel Osciak7f986392010-04-23 05:38:37 -0300206}
207
208/**
209 * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
210 * ready buffers and return it
211 */
212static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
213{
Marek Szyprowski908a0d72011-01-12 06:50:24 -0300214 return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx);
Pawel Osciak7f986392010-04-23 05:38:37 -0300215}
216
217#endif /* _MEDIA_V4L2_MEM2MEM_H */
218