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 
dvb_net_release(struct dvb_net * dvbnet)83 static inline void dvb_net_release(struct dvb_net *dvbnet)
84 {
85 }
86 
dvb_net_init(struct dvb_adapter * adap,struct dvb_net * dvbnet,struct dmx_demux * dmx)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
96