drivers/media/video/pvrusb2/pvrusb2-io.h

   1 /*
   2  *
   3  *  $Id$
   4  *
   5  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21 #ifndef __PVRUSB2_IO_H
  22 #define __PVRUSB2_IO_H
  23
  24 #include <linux/usb.h>
  25 #include <linux/list.h>
  26
  27 typedef void (*pvr2_stream_callback)(void *);
  28
  29 enum pvr2_buffer_state {
  30         pvr2_buffer_state_none = 0,   // Not on any list
  31         pvr2_buffer_state_idle = 1,   // Buffer is ready to be used again
  32         pvr2_buffer_state_queued = 2, // Buffer has been queued for filling
  33         pvr2_buffer_state_ready = 3,  // Buffer has data available
  34 };
  35
  36 struct pvr2_stream;
  37 struct pvr2_buffer;
  38
  39 /* Initialize / tear down stream structure */
  40 struct pvr2_stream *pvr2_stream_create(void);
  41 void pvr2_stream_destroy(struct pvr2_stream *);
  42 void pvr2_stream_setup(struct pvr2_stream *,
  43                        struct usb_device *dev,int endpoint,
  44                        unsigned int tolerance);
  45 void pvr2_stream_set_callback(struct pvr2_stream *,
  46                               pvr2_stream_callback func,
  47                               void *data);
  48
  49 /* Query / set the nominal buffer count */
  50 int pvr2_stream_get_buffer_count(struct pvr2_stream *);
  51 int pvr2_stream_set_buffer_count(struct pvr2_stream *,unsigned int);
  52
  53 /* Get a pointer to a buffer that is either idle, ready, or is specified
  54    named. */
  55 struct pvr2_buffer *pvr2_stream_get_idle_buffer(struct pvr2_stream *);
  56 struct pvr2_buffer *pvr2_stream_get_ready_buffer(struct pvr2_stream *);
  57 struct pvr2_buffer *pvr2_stream_get_buffer(struct pvr2_stream *sp,int id);
  58
  59 /* Find out how many buffers are idle or ready */
  60 int pvr2_stream_get_ready_count(struct pvr2_stream *);
  61
  62
  63 /* Kill all pending buffers and throw away any ready buffers as well */
  64 void pvr2_stream_kill(struct pvr2_stream *);
  65
  66 /* Set up the actual storage for a buffer */
  67 int pvr2_buffer_set_buffer(struct pvr2_buffer *,void *ptr,unsigned int cnt);
  68
  69 /* Find out size of data in the given ready buffer */
  70 unsigned int pvr2_buffer_get_count(struct pvr2_buffer *);
  71
  72 /* Retrieve completion code for given ready buffer */
  73 int pvr2_buffer_get_status(struct pvr2_buffer *);
  74
  75 /* Retrieve ID of given buffer */
  76 int pvr2_buffer_get_id(struct pvr2_buffer *);
  77
  78 /* Start reading into given buffer (kill it if needed) */
  79 int pvr2_buffer_queue(struct pvr2_buffer *);
  80
  81 #endif /* __PVRUSB2_IO_H */
  82
  83 /*
  84   Stuff for Emacs to see, in order to encourage consistent editing style:
  85   *** Local Variables: ***
  86   *** mode: c ***
  87   *** fill-column: 75 ***
  88   *** tab-width: 8 ***
  89   *** c-basic-offset: 8 ***
  90   *** End: ***
  91   */