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         /* optional cap/out vb2 queues lock */
  68         struct mutex                    *q_lock;
  69
  70 /* private: internal use only */
  71         struct v4l2_m2m_dev             *m2m_dev;
  72
  73         /* Capture (output to memory) queue context */
  74         struct v4l2_m2m_queue_ctx       cap_q_ctx;
  75
  76         /* Output (input from memory) queue context */
  77         struct v4l2_m2m_queue_ctx       out_q_ctx;
  78
  79         /* For device job queue */
  80         struct list_head                queue;
  81         unsigned long                   job_flags;
  82         wait_queue_head_t               finished;
  83
  84         /* Instance private data */
  85         void                            *priv;
  86 };
  87
  88 struct v4l2_m2m_buffer {
  89         struct vb2_buffer       vb;
  90         struct list_head        list;
  91 };
  92
  93 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
  94
  95 struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
  96                                        enum v4l2_buf_type type);
  97
  98 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
  99                          struct v4l2_m2m_ctx *m2m_ctx);
 100
 101 static inline void
 102 v4l2_m2m_buf_done(struct vb2_buffer *buf, enum vb2_buffer_state state)
 103 {
 104         vb2_buffer_done(buf, state);
 105 }
 106
 107 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 108                      struct v4l2_requestbuffers *reqbufs);
 109
 110 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 111                       struct v4l2_buffer *buf);
 112
 113 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 114                   struct v4l2_buffer *buf);
 115 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 116                    struct v4l2_buffer *buf);
 117 int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 118                          struct v4l2_create_buffers *create);
 119
 120 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 121                    struct v4l2_exportbuffer *eb);
 122
 123 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 124                       enum v4l2_buf_type type);
 125 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 126                        enum v4l2_buf_type type);
 127
 128 unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 129                            struct poll_table_struct *wait);
 130
 131 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 132                   struct vm_area_struct *vma);
 133
 134 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops);
 135 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
 136
 137 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
 138                 void *drv_priv,
 139                 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
 140
 141 static inline void v4l2_m2m_set_src_buffered(struct v4l2_m2m_ctx *m2m_ctx,
 142                                              bool buffered)
 143 {
 144         m2m_ctx->out_q_ctx.buffered = buffered;
 145 }
 146
 147 static inline void v4l2_m2m_set_dst_buffered(struct v4l2_m2m_ctx *m2m_ctx,
 148                                              bool buffered)
 149 {
 150         m2m_ctx->cap_q_ctx.buffered = buffered;
 151 }
 152
 153 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
 154
 155 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb);
 156
 157 /**
 158  * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
 159  * use
 160  */
 161 static inline
 162 unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 163 {
 164         return m2m_ctx->out_q_ctx.num_rdy;
 165 }
 166
 167 /**
 168  * v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers
 169  * ready for use
 170  */
 171 static inline
 172 unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 173 {
 174         return m2m_ctx->cap_q_ctx.num_rdy;
 175 }
 176
 177 void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
 178
 179 /**
 180  * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
 181  * buffers
 182  */
 183 static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
 184 {
 185         return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx);
 186 }
 187
 188 /**
 189  * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
 190  * ready buffers
 191  */
 192 static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
 193 {
 194         return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx);
 195 }
 196
 197 /**
 198  * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
 199  */
 200 static inline
 201 struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
 202 {
 203         return &m2m_ctx->out_q_ctx.q;
 204 }
 205
 206 /**
 207  * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers
 208  */
 209 static inline
 210 struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
 211 {
 212         return &m2m_ctx->cap_q_ctx.q;
 213 }
 214
 215 void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
 216
 217 /**
 218  * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
 219  * buffers and return it
 220  */
 221 static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
 222 {
 223         return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx);
 224 }
 225
 226 /**
 227  * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
 228  * ready buffers and return it
 229  */
 230 static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
 231 {
 232         return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx);
 233 }
 234
 235 /* v4l2 ioctl helpers */
 236
 237 int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
 238                                 struct v4l2_requestbuffers *rb);
 239 int v4l2_m2m_ioctl_create_bufs(struct file *file, void *fh,
 240                                 struct v4l2_create_buffers *create);
 241 int v4l2_m2m_ioctl_querybuf(struct file *file, void *fh,
 242                                 struct v4l2_buffer *buf);
 243 int v4l2_m2m_ioctl_expbuf(struct file *file, void *fh,
 244                                 struct v4l2_exportbuffer *eb);
 245 int v4l2_m2m_ioctl_qbuf(struct file *file, void *fh,
 246                                 struct v4l2_buffer *buf);
 247 int v4l2_m2m_ioctl_dqbuf(struct file *file, void *fh,
 248                                 struct v4l2_buffer *buf);
 249 int v4l2_m2m_ioctl_streamon(struct file *file, void *fh,
 250                                 enum v4l2_buf_type type);
 251 int v4l2_m2m_ioctl_streamoff(struct file *file, void *fh,
 252                                 enum v4l2_buf_type type);
 253 int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma);
 254 unsigned int v4l2_m2m_fop_poll(struct file *file, poll_table *wait);
 255
 256 #endif /* _MEDIA_V4L2_MEM2MEM_H */
 257