include/media/dvb_net.h

   1 /*
   2  * dvb_net.h
   3  *
   4  * Copyright (C) 2001 Ralph Metzler for convergence integrated media GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public License
   8  * as published by the Free Software Foundation; either version 2.1
   9  * of the License, or (at your option) any later version.
  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  */
  17
  18 #ifndef _DVB_NET_H_
  19 #define _DVB_NET_H_
  20
  21 #include <linux/module.h>
  22
  23 #include <media/dvbdev.h>
  24
  25 struct net_device;
  26
  27 #define DVB_NET_DEVICES_MAX 10
  28
  29 #ifdef CONFIG_DVB_NET
  30
  31 /**
  32  * struct dvb_net - describes a DVB network interface
  33  *
  34  * @dvbdev:             pointer to &struct dvb_device.
  35  * @device:             array of pointers to &struct net_device.
  36  * @state:              array of integers to each net device. A value
  37  *                      different than zero means that the interface is
  38  *                      in usage.
  39  * @exit:               flag to indicate when the device is being removed.
  40  * @demux:              pointer to &struct dmx_demux.
  41  * @ioctl_mutex:        protect access to this struct.
  42  * @remove_mutex:       mutex that avoids a race condition between a callback
  43  *                      called when the hardware is disconnected and the
  44  *                      file_operations of dvb_net.
  45  *
  46  * Currently, the core supports up to %DVB_NET_DEVICES_MAX (10) network
  47  * devices.
  48  */
  49
  50 struct dvb_net {
  51         struct dvb_device *dvbdev;
  52         struct net_device *device[DVB_NET_DEVICES_MAX];
  53         int state[DVB_NET_DEVICES_MAX];
  54         unsigned int exit:1;
  55         struct dmx_demux *demux;
  56         struct mutex ioctl_mutex;
  57         struct mutex remove_mutex;
  58 };
  59
  60 /**
  61  * dvb_net_init - nitializes a digital TV network device and registers it.
  62  *
  63  * @adap:       pointer to &struct dvb_adapter.
  64  * @dvbnet:     pointer to &struct dvb_net.
  65  * @dmxdemux:   pointer to &struct dmx_demux.
  66  */
  67 int dvb_net_init(struct dvb_adapter *adap, struct dvb_net *dvbnet,
  68                   struct dmx_demux *dmxdemux);
  69
  70 /**
  71  * dvb_net_release - releases a digital TV network device and unregisters it.
  72  *
  73  * @dvbnet:     pointer to &struct dvb_net.
  74  */
  75 void dvb_net_release(struct dvb_net *dvbnet);
  76
  77 #else
  78
  79 struct dvb_net {
  80         struct dvb_device *dvbdev;
  81 };
  82
  83 static inline void dvb_net_release(struct dvb_net *dvbnet)
  84 {
  85 }
  86
  87 static inline int dvb_net_init(struct dvb_adapter *adap,
  88                                struct dvb_net *dvbnet, struct dmx_demux *dmx)
  89 {
  90         return 0;
  91 }
  92
  93 #endif /* ifdef CONFIG_DVB_NET */
  94
  95 #endif