include/media/v4l2-mem2mem.h

   1 /*
   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.
   8  * Pawel Osciak, <pawel@osciak.com>
   9  * 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
  20 #include <media/videobuf2-core.h>
  21
  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  */
  44 struct v4l2_m2m_ops {
  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);
  50 };
  51
  52 struct v4l2_m2m_dev;
  53
  54 struct v4l2_m2m_queue_ctx {
  55 /* private: internal use only */
  56         struct vb2_queue        q;
  57
  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;
  62         u8                      num_rdy;
  63         bool                    buffered;
  64 };
  65
  66 struct v4l2_m2m_ctx {
  67 /* private: internal use only */
  68         struct v4l2_m2m_dev             *m2m_dev;
  69
  70         /* Capture (output to memory) queue context */
  71         struct v4l2_m2m_queue_ctx       cap_q_ctx;
  72
  73         /* Output (input from memory) queue context */
  74         struct v4l2_m2m_queue_ctx       out_q_ctx;
  75
  76         /* For device job queue */
  77         struct list_head                queue;
  78         unsigned long                   job_flags;
  79         wait_queue_head_t               finished;
  80
  81         /* Instance private data */
  82         void                            *priv;
  83 };
  84
  85 struct v4l2_m2m_buffer {
  86         struct vb2_buffer       vb;
  87         struct list_head        list;
  88 };
  89
  90 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
  91
  92 struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
  93                                        enum v4l2_buf_type type);
  94
  95 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
  96                          struct v4l2_m2m_ctx *m2m_ctx);
  97
  98 static inline void
  99 v4l2_m2m_buf_done(struct vb2_buffer *buf, enum vb2_buffer_state state)
 100 {
 101         vb2_buffer_done(buf, state);
 102 }
 103
 104 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 105                      struct v4l2_requestbuffers *reqbufs);
 106
 107 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 108                       struct v4l2_buffer *buf);
 109
 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);
 116
 117 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 118                    struct v4l2_exportbuffer *eb);
 119
 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);
 124
 125 unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 126                            struct poll_table_struct *wait);
 127
 128 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 129                   struct vm_area_struct *vma);
 130
 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);
 133
 134 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
 135                 void *drv_priv,
 136                 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
 137
 138 static inline void v4l2_m2m_set_src_buffered(struct v4l2_m2m_ctx *m2m_ctx,
 139                                              bool buffered)
 140 {
 141         m2m_ctx->out_q_ctx.buffered = buffered;
 142 }
 143
 144 static inline void v4l2_m2m_set_dst_buffered(struct v4l2_m2m_ctx *m2m_ctx,
 145                                              bool buffered)
 146 {
 147         m2m_ctx->cap_q_ctx.buffered = buffered;
 148 }
 149
 150 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
 151
 152 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb);
 153
 154 /**
 155  * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
 156  * use
 157  */
 158 static inline
 159 unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 160 {
 161         return m2m_ctx->out_q_ctx.num_rdy;
 162 }
 163
 164 /**
 165  * v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers
 166  * ready for use
 167  */
 168 static inline
 169 unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 170 {
 171         return m2m_ctx->cap_q_ctx.num_rdy;
 172 }
 173
 174 void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
 175
 176 /**
 177  * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
 178  * buffers
 179  */
 180 static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
 181 {
 182         return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx);
 183 }
 184
 185 /**
 186  * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
 187  * ready buffers
 188  */
 189 static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
 190 {
 191         return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx);
 192 }
 193
 194 /**
 195  * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
 196  */
 197 static inline
 198 struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
 199 {
 200         return &m2m_ctx->out_q_ctx.q;
 201 }
 202
 203 /**
 204  * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers
 205  */
 206 static inline
 207 struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
 208 {
 209         return &m2m_ctx->cap_q_ctx.q;
 210 }
 211
 212 void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
 213
 214 /**
 215  * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
 216  * buffers and return it
 217  */
 218 static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
 219 {
 220         return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx);
 221 }
 222
 223 /**
 224  * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
 225  * ready buffers and return it
 226  */
 227 static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
 228 {
 229         return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx);
 230 }
 231
 232 #endif /* _MEDIA_V4L2_MEM2MEM_H */
 233