drivers/media/video/cx18/cx18-queue.h

   1 /*
   2  *  cx18 buffer queues
   3  *
   4  *  Derived from ivtv-queue.h
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21  *  02111-1307  USA
  22  */
  23
  24 #define CX18_DMA_UNMAPPED       ((u32) -1)
  25
  26 /* cx18_buffer utility functions */
  27
  28 static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
  29         struct cx18_buffer *buf)
  30 {
  31         pci_dma_sync_single_for_cpu(s->cx->dev, buf->dma_handle,
  32                                 s->buf_size, s->dma);
  33 }
  34
  35 static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
  36         struct cx18_buffer *buf)
  37 {
  38         pci_dma_sync_single_for_device(s->cx->dev, buf->dma_handle,
  39                                 s->buf_size, s->dma);
  40 }
  41
  42 int cx18_buf_copy_from_user(struct cx18_stream *s, struct cx18_buffer *buf,
  43         const char __user *src, int copybytes);
  44 void cx18_buf_swap(struct cx18_buffer *buf);
  45
  46 /* cx18_queue utility functions */
  47 void cx18_queue_init(struct cx18_queue *q);
  48 void cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
  49         struct cx18_queue *q);
  50 struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
  51 int cx18_queue_move(struct cx18_stream *s, struct cx18_queue *from,
  52        struct cx18_queue *steal, struct cx18_queue *to, int needed_bytes);
  53 struct cx18_buffer *cx18_queue_find_buf(struct cx18_stream *s, u32 id,
  54         u32 bytesused);
  55 void cx18_flush_queues(struct cx18_stream *s);
  56
  57 /* cx18_stream utility functions */
  58 int cx18_stream_alloc(struct cx18_stream *s);
  59 void cx18_stream_free(struct cx18_stream *s);