1 /*
2  * dmxdev.h
3  *
4  * Copyright (C) 2000 Ralph Metzler & Marcus Metzler
5  *                    for convergence integrated media GmbH
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public License
9  * as published by the Free Software Foundation; either version 2.1
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  */
18 
19 #ifndef _DMXDEV_H_
20 #define _DMXDEV_H_
21 
22 #include <linux/types.h>
23 #include <linux/spinlock.h>
24 #include <linux/time.h>
25 #include <linux/timer.h>
26 #include <linux/wait.h>
27 #include <linux/fs.h>
28 #include <linux/string.h>
29 #include <linux/mutex.h>
30 #include <linux/slab.h>
31 
32 #include <linux/dvb/dmx.h>
33 
34 #include <media/dvbdev.h>
35 #include <media/demux.h>
36 #include <media/dvb_ringbuffer.h>
37 #include <media/dvb_vb2.h>
38 
39 /**
40  * enum dmxdev_type - type of demux filter type.
41  *
42  * @DMXDEV_TYPE_NONE:	no filter set.
43  * @DMXDEV_TYPE_SEC:	section filter.
44  * @DMXDEV_TYPE_PES:	Program Elementary Stream (PES) filter.
45  */
46 enum dmxdev_type {
47 	DMXDEV_TYPE_NONE,
48 	DMXDEV_TYPE_SEC,
49 	DMXDEV_TYPE_PES,
50 };
51 
52 /**
53  * enum dmxdev_state - state machine for the dmxdev.
54  *
55  * @DMXDEV_STATE_FREE:		indicates that the filter is freed.
56  * @DMXDEV_STATE_ALLOCATED:	indicates that the filter was allocated
57  *				to be used.
58  * @DMXDEV_STATE_SET:		indicates that the filter parameters are set.
59  * @DMXDEV_STATE_GO:		indicates that the filter is running.
60  * @DMXDEV_STATE_DONE:		indicates that a packet was already filtered
61  *				and the filter is now disabled.
62  *				Set only if %DMX_ONESHOT. See
63  *				&dmx_sct_filter_params.
64  * @DMXDEV_STATE_TIMEDOUT:	Indicates a timeout condition.
65  */
66 enum dmxdev_state {
67 	DMXDEV_STATE_FREE,
68 	DMXDEV_STATE_ALLOCATED,
69 	DMXDEV_STATE_SET,
70 	DMXDEV_STATE_GO,
71 	DMXDEV_STATE_DONE,
72 	DMXDEV_STATE_TIMEDOUT
73 };
74 
75 /**
76  * struct dmxdev_feed - digital TV dmxdev feed
77  *
78  * @pid:	Program ID to be filtered
79  * @ts:		pointer to &struct dmx_ts_feed
80  * @next:	&struct list_head pointing to the next feed.
81  */
82 
83 struct dmxdev_feed {
84 	u16 pid;
85 	struct dmx_ts_feed *ts;
86 	struct list_head next;
87 };
88 
89 /**
90  * struct dmxdev_filter - digital TV dmxdev filter
91  *
92  * @filter:	a union describing a dmxdev filter.
93  *		Currently used only for section filters.
94  * @filter.sec: a &struct dmx_section_filter pointer.
95  *		For section filter only.
96  * @feed:	a union describing a dmxdev feed.
97  *		Depending on the filter type, it can be either
98  *		@feed.ts or @feed.sec.
99  * @feed.ts:	a &struct list_head list.
100  *		For TS and PES feeds.
101  * @feed.sec:	a &struct dmx_section_feed pointer.
102  *		For section feed only.
103  * @params:	a union describing dmxdev filter parameters.
104  *		Depending on the filter type, it can be either
105  *		@params.sec or @params.pes.
106  * @params.sec:	a &struct dmx_sct_filter_params embedded struct.
107  *		For section filter only.
108  * @params.pes:	a &struct dmx_pes_filter_params embedded struct.
109  *		For PES filter only.
110  * @type:	type of the dmxdev filter, as defined by &enum dmxdev_type.
111  * @state:	state of the dmxdev filter, as defined by &enum dmxdev_state.
112  * @dev:	pointer to &struct dmxdev.
113  * @buffer:	an embedded &struct dvb_ringbuffer buffer.
114  * @vb2_ctx:	control struct for VB2 handler
115  * @mutex:	protects the access to &struct dmxdev_filter.
116  * @timer:	&struct timer_list embedded timer, used to check for
117  *		feed timeouts.
118  *		Only for section filter.
119  * @todo:	index for the @secheader.
120  *		Only for section filter.
121  * @secheader:	buffer cache to parse the section header.
122  *		Only for section filter.
123  */
124 struct dmxdev_filter {
125 	union {
126 		struct dmx_section_filter *sec;
127 	} filter;
128 
129 	union {
130 		/* list of TS and PES feeds (struct dmxdev_feed) */
131 		struct list_head ts;
132 		struct dmx_section_feed *sec;
133 	} feed;
134 
135 	union {
136 		struct dmx_sct_filter_params sec;
137 		struct dmx_pes_filter_params pes;
138 	} params;
139 
140 	enum dmxdev_type type;
141 	enum dmxdev_state state;
142 	struct dmxdev *dev;
143 	struct dvb_ringbuffer buffer;
144 	struct dvb_vb2_ctx vb2_ctx;
145 
146 	struct mutex mutex;
147 
148 	/* only for sections */
149 	struct timer_list timer;
150 	int todo;
151 	u8 secheader[3];
152 };
153 
154 /**
155  * struct dmxdev - Describes a digital TV demux device.
156  *
157  * @dvbdev:		pointer to &struct dvb_device associated with
158  *			the demux device node.
159  * @dvr_dvbdev:		pointer to &struct dvb_device associated with
160  *			the dvr device node.
161  * @filter:		pointer to &struct dmxdev_filter.
162  * @demux:		pointer to &struct dmx_demux.
163  * @filternum:		number of filters.
164  * @capabilities:	demux capabilities as defined by &enum dmx_demux_caps.
165  * @may_do_mmap:	flag used to indicate if the device may do mmap.
166  * @exit:		flag to indicate that the demux is being released.
167  * @dvr_orig_fe:	pointer to &struct dmx_frontend.
168  * @dvr_buffer:		embedded &struct dvb_ringbuffer for DVB output.
169  * @dvr_vb2_ctx:	control struct for VB2 handler
170  * @mutex:		protects the usage of this structure.
171  * @lock:		protects access to &dmxdev->filter->data.
172  */
173 struct dmxdev {
174 	struct dvb_device *dvbdev;
175 	struct dvb_device *dvr_dvbdev;
176 
177 	struct dmxdev_filter *filter;
178 	struct dmx_demux *demux;
179 
180 	int filternum;
181 	int capabilities;
182 
183 	unsigned int may_do_mmap:1;
184 	unsigned int exit:1;
185 #define DMXDEV_CAP_DUPLEX 1
186 	struct dmx_frontend *dvr_orig_fe;
187 
188 	struct dvb_ringbuffer dvr_buffer;
189 #define DVR_BUFFER_SIZE (10*188*1024)
190 
191 	struct dvb_vb2_ctx dvr_vb2_ctx;
192 
193 	struct mutex mutex;
194 	spinlock_t lock;
195 };
196 
197 /**
198  * dvb_dmxdev_init - initializes a digital TV demux and registers both demux
199  *	and DVR devices.
200  *
201  * @dmxdev: pointer to &struct dmxdev.
202  * @adap: pointer to &struct dvb_adapter.
203  */
204 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *adap);
205 
206 /**
207  * dvb_dmxdev_release - releases a digital TV demux and unregisters it.
208  *
209  * @dmxdev: pointer to &struct dmxdev.
210  */
211 void dvb_dmxdev_release(struct dmxdev *dmxdev);
212 
213 #endif /* _DMXDEV_H_ */
214