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

   1 /*
   2  *  $Id$
   3  *
   4  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20 #ifndef __PVRUSB2_BASE_H
  21 #define __PVRUSB2_BASE_H
  22
  23 #include <linux/mutex.h>
  24 #include <linux/usb.h>
  25 #include <linux/workqueue.h>
  26
  27 struct pvr2_hdw;     /* hardware interface - defined elsewhere */
  28 struct pvr2_stream;  /* stream interface - defined elsewhere */
  29
  30 struct pvr2_context;        /* All central state */
  31 struct pvr2_channel;        /* One I/O pathway to a user */
  32 struct pvr2_context_stream; /* Wrapper for a stream */
  33 struct pvr2_crit_reg;       /* Critical region pointer */
  34 struct pvr2_ioread;         /* Low level stream structure */
  35
  36 struct pvr2_context_stream {
  37         struct pvr2_channel *user;
  38         struct pvr2_stream *stream;
  39 };
  40
  41 struct pvr2_context {
  42         struct pvr2_channel *mc_first;
  43         struct pvr2_channel *mc_last;
  44         struct pvr2_hdw *hdw;
  45         struct pvr2_context_stream video_stream;
  46         struct mutex mutex;
  47         int disconnect_flag;
  48
  49         /* Called after pvr2_context initialization is complete */
  50         void (*setup_func)(struct pvr2_context *);
  51
  52         /* Work queue overhead for out-of-line processing */
  53         struct workqueue_struct *workqueue;
  54         struct work_struct workinit;
  55         struct work_struct workpoll;
  56 };
  57
  58 struct pvr2_channel {
  59         struct pvr2_context *mc_head;
  60         struct pvr2_channel *mc_next;
  61         struct pvr2_channel *mc_prev;
  62         struct pvr2_context_stream *stream;
  63         struct pvr2_hdw *hdw;
  64         void (*check_func)(struct pvr2_channel *);
  65 };
  66
  67 void pvr2_context_enter(struct pvr2_context *);
  68 void pvr2_context_exit(struct pvr2_context *);
  69
  70 struct pvr2_context *pvr2_context_create(struct usb_interface *intf,
  71                                          const struct usb_device_id *devid,
  72                                          void (*setup_func)(struct pvr2_context *));
  73 void pvr2_context_disconnect(struct pvr2_context *);
  74
  75 void pvr2_channel_init(struct pvr2_channel *,struct pvr2_context *);
  76 void pvr2_channel_done(struct pvr2_channel *);
  77 int pvr2_channel_claim_stream(struct pvr2_channel *,
  78                               struct pvr2_context_stream *);
  79 struct pvr2_ioread *pvr2_channel_create_mpeg_stream(
  80         struct pvr2_context_stream *);
  81
  82
  83 #endif /* __PVRUSB2_CONTEXT_H */
  84 /*
  85   Stuff for Emacs to see, in order to encourage consistent editing style:
  86   *** Local Variables: ***
  87   *** mode: c ***
  88   *** fill-column: 75 ***
  89   *** tab-width: 8 ***
  90   *** c-basic-offset: 8 ***
  91   *** End: ***
  92   */