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  * @lock:       optional. Define a driver's own lock callback, instead of using
  44  *              m2m_ctx->q_lock.
  45  * @unlock:     optional. Define a driver's own unlock callback, instead of
  46  *              using m2m_ctx->q_lock.
  47  */
  48 struct v4l2_m2m_ops {
  49         void (*device_run)(void *priv);
  50         int (*job_ready)(void *priv);
  51         void (*job_abort)(void *priv);
  52         void (*lock)(void *priv);
  53         void (*unlock)(void *priv);
  54 };
  55
  56 struct v4l2_m2m_dev;
  57
  58 struct v4l2_m2m_queue_ctx {
  59 /* private: internal use only */
  60         struct vb2_queue        q;
  61
  62         /* Queue for buffers ready to be processed as soon as this
  63          * instance receives access to the device */
  64         struct list_head        rdy_queue;
  65         spinlock_t              rdy_spinlock;
  66         u8                      num_rdy;
  67         bool                    buffered;
  68 };
  69
  70 struct v4l2_m2m_ctx {
  71         /* optional cap/out vb2 queues lock */
  72         struct mutex                    *q_lock;
  73
  74 /* private: internal use only */
  75         struct v4l2_m2m_dev             *m2m_dev;
  76
  77         /* Capture (output to memory) queue context */
  78         struct v4l2_m2m_queue_ctx       cap_q_ctx;
  79
  80         /* Output (input from memory) queue context */
  81         struct v4l2_m2m_queue_ctx       out_q_ctx;
  82
  83         /* For device job queue */
  84         struct list_head                queue;
  85         unsigned long                   job_flags;
  86         wait_queue_head_t               finished;
  87
  88         /* Instance private data */
  89         void                            *priv;
  90 };
  91
  92 struct v4l2_m2m_buffer {
  93         struct vb2_buffer       vb;
  94         struct list_head        list;
  95 };
  96
  97 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
  98
  99 struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
 100                                        enum v4l2_buf_type type);
 101
 102 void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx);
 103
 104 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
 105                          struct v4l2_m2m_ctx *m2m_ctx);
 106
 107 static inline void
 108 v4l2_m2m_buf_done(struct vb2_buffer *buf, enum vb2_buffer_state state)
 109 {
 110         vb2_buffer_done(buf, state);
 111 }
 112
 113 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 114                      struct v4l2_requestbuffers *reqbufs);
 115
 116 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 117                       struct v4l2_buffer *buf);
 118
 119 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 120                   struct v4l2_buffer *buf);
 121 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 122                    struct v4l2_buffer *buf);
 123 int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 124                          struct v4l2_buffer *buf);
 125 int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 126                          struct v4l2_create_buffers *create);
 127
 128 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 129                    struct v4l2_exportbuffer *eb);
 130
 131 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 132                       enum v4l2_buf_type type);
 133 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 134                        enum v4l2_buf_type type);
 135
 136 unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 137                            struct poll_table_struct *wait);
 138
 139 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 140                   struct vm_area_struct *vma);
 141
 142 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops);
 143 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
 144
 145 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
 146                 void *drv_priv,
 147                 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
 148
 149 static inline void v4l2_m2m_set_src_buffered(struct v4l2_m2m_ctx *m2m_ctx,
 150                                              bool buffered)
 151 {
 152         m2m_ctx->out_q_ctx.buffered = buffered;
 153 }
 154
 155 static inline void v4l2_m2m_set_dst_buffered(struct v4l2_m2m_ctx *m2m_ctx,
 156                                              bool buffered)
 157 {
 158         m2m_ctx->cap_q_ctx.buffered = buffered;
 159 }
 160
 161 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
 162
 163 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb);
 164
 165 /**
 166  * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
 167  * use
 168  *
 169  * @m2m_ctx: pointer to struct v4l2_m2m_ctx
 170  */
 171 static inline
 172 unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 173 {
 174         return m2m_ctx->out_q_ctx.num_rdy;
 175 }
 176
 177 /**
 178  * v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers
 179  * ready for use
 180  *
 181  * @m2m_ctx: pointer to struct v4l2_m2m_ctx
 182  */
 183 static inline
 184 unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 185 {
 186         return m2m_ctx->cap_q_ctx.num_rdy;
 187 }
 188
 189 void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
 190
 191 /**
 192  * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
 193  * buffers
 194  *
 195  * @m2m_ctx: pointer to struct v4l2_m2m_ctx
 196  */
 197 static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
 198 {
 199         return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx);
 200 }
 201
 202 /**
 203  * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
 204  * ready buffers
 205  *
 206  * @m2m_ctx: pointer to struct v4l2_m2m_ctx
 207  */
 208 static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
 209 {
 210         return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx);
 211 }
 212
 213 /**
 214  * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
 215  *
 216  * @m2m_ctx: pointer to struct v4l2_m2m_ctx
 217  */
 218 static inline
 219 struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
 220 {
 221         return &m2m_ctx->out_q_ctx.q;
 222 }
 223
 224 /**
 225  * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers
 226  *
 227  * @m2m_ctx: pointer to struct v4l2_m2m_ctx
 228  */
 229 static inline
 230 struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
 231 {
 232         return &m2m_ctx->cap_q_ctx.q;
 233 }
 234
 235 void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
 236
 237 /**
 238  * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
 239  * buffers and return it
 240  *
 241  * @m2m_ctx: pointer to struct v4l2_m2m_ctx
 242  */
 243 static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
 244 {
 245         return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx);
 246 }
 247
 248 /**
 249  * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
 250  * ready buffers and return it
 251  *
 252  * @m2m_ctx: pointer to struct v4l2_m2m_ctx
 253  */
 254 static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
 255 {
 256         return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx);
 257 }
 258
 259 /* v4l2 ioctl helpers */
 260
 261 int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
 262                                 struct v4l2_requestbuffers *rb);
 263 int v4l2_m2m_ioctl_create_bufs(struct file *file, void *fh,
 264                                 struct v4l2_create_buffers *create);
 265 int v4l2_m2m_ioctl_querybuf(struct file *file, void *fh,
 266                                 struct v4l2_buffer *buf);
 267 int v4l2_m2m_ioctl_expbuf(struct file *file, void *fh,
 268                                 struct v4l2_exportbuffer *eb);
 269 int v4l2_m2m_ioctl_qbuf(struct file *file, void *fh,
 270                                 struct v4l2_buffer *buf);
 271 int v4l2_m2m_ioctl_dqbuf(struct file *file, void *fh,
 272                                 struct v4l2_buffer *buf);
 273 int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *fh,
 274                                struct v4l2_buffer *buf);
 275 int v4l2_m2m_ioctl_streamon(struct file *file, void *fh,
 276                                 enum v4l2_buf_type type);
 277 int v4l2_m2m_ioctl_streamoff(struct file *file, void *fh,
 278                                 enum v4l2_buf_type type);
 279 int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma);
 280 unsigned int v4l2_m2m_fop_poll(struct file *file, poll_table *wait);
 281
 282 #endif /* _MEDIA_V4L2_MEM2MEM_H */
 283