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1da177e4 LT |
1 | /* |
2 | * $Id: video-buf-dvb.c,v 1.7 2004/12/09 12:51:35 kraxel Exp $ | |
3 | * | |
4 | * some helper function for simple DVB cards which simply DMA the | |
5 | * complete transport stream and let the computer sort everything else | |
6 | * (i.e. we are using the software demux, ...). Also uses the | |
7 | * video-buf to manage DMA buffers. | |
8 | * | |
9 | * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/kthread.h> | |
22 | #include <linux/file.h> | |
23 | #include <linux/suspend.h> | |
24 | ||
25 | #include <media/video-buf.h> | |
26 | #include <media/video-buf-dvb.h> | |
27 | ||
28 | /* ------------------------------------------------------------------ */ | |
29 | ||
30 | MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | static unsigned int debug = 0; | |
34 | module_param(debug, int, 0644); | |
35 | MODULE_PARM_DESC(debug,"enable debug messages"); | |
36 | ||
37 | #define dprintk(fmt, arg...) if (debug) \ | |
38 | printk(KERN_DEBUG "%s/dvb: " fmt, dvb->name , ## arg) | |
39 | ||
40 | /* ------------------------------------------------------------------ */ | |
41 | ||
42 | static int videobuf_dvb_thread(void *data) | |
43 | { | |
44 | struct videobuf_dvb *dvb = data; | |
45 | struct videobuf_buffer *buf; | |
46 | unsigned long flags; | |
47 | int err; | |
48 | ||
49 | dprintk("dvb thread started\n"); | |
50 | videobuf_read_start(&dvb->dvbq); | |
51 | ||
52 | for (;;) { | |
53 | /* fetch next buffer */ | |
54 | buf = list_entry(dvb->dvbq.stream.next, | |
55 | struct videobuf_buffer, stream); | |
56 | list_del(&buf->stream); | |
57 | err = videobuf_waiton(buf,0,1); | |
58 | BUG_ON(0 != err); | |
59 | ||
60 | /* no more feeds left or stop_feed() asked us to quit */ | |
61 | if (0 == dvb->nfeeds) | |
62 | break; | |
63 | if (kthread_should_stop()) | |
64 | break; | |
3e1d1d28 | 65 | try_to_freeze(); |
1da177e4 LT |
66 | |
67 | /* feed buffer data to demux */ | |
68 | if (buf->state == STATE_DONE) | |
69 | dvb_dmx_swfilter(&dvb->demux, buf->dma.vmalloc, | |
70 | buf->size); | |
71 | ||
72 | /* requeue buffer */ | |
73 | list_add_tail(&buf->stream,&dvb->dvbq.stream); | |
74 | spin_lock_irqsave(dvb->dvbq.irqlock,flags); | |
75 | dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf); | |
76 | spin_unlock_irqrestore(dvb->dvbq.irqlock,flags); | |
77 | } | |
78 | ||
79 | videobuf_read_stop(&dvb->dvbq); | |
80 | dprintk("dvb thread stopped\n"); | |
81 | ||
82 | /* Hmm, linux becomes *very* unhappy without this ... */ | |
83 | while (!kthread_should_stop()) { | |
84 | set_current_state(TASK_INTERRUPTIBLE); | |
85 | schedule(); | |
86 | } | |
87 | return 0; | |
88 | } | |
89 | ||
90 | static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed) | |
91 | { | |
92 | struct dvb_demux *demux = feed->demux; | |
93 | struct videobuf_dvb *dvb = demux->priv; | |
94 | int rc; | |
95 | ||
96 | if (!demux->dmx.frontend) | |
97 | return -EINVAL; | |
98 | ||
99 | down(&dvb->lock); | |
100 | dvb->nfeeds++; | |
101 | rc = dvb->nfeeds; | |
102 | ||
103 | if (NULL != dvb->thread) | |
104 | goto out; | |
105 | dvb->thread = kthread_run(videobuf_dvb_thread, | |
106 | dvb, "%s dvb", dvb->name); | |
107 | if (IS_ERR(dvb->thread)) { | |
108 | rc = PTR_ERR(dvb->thread); | |
109 | dvb->thread = NULL; | |
110 | } | |
111 | ||
112 | out: | |
113 | up(&dvb->lock); | |
114 | return rc; | |
115 | } | |
116 | ||
117 | static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed) | |
118 | { | |
119 | struct dvb_demux *demux = feed->demux; | |
120 | struct videobuf_dvb *dvb = demux->priv; | |
121 | int err = 0; | |
122 | ||
123 | down(&dvb->lock); | |
124 | dvb->nfeeds--; | |
125 | if (0 == dvb->nfeeds && NULL != dvb->thread) { | |
126 | // FIXME: cx8802_cancel_buffers(dev); | |
127 | err = kthread_stop(dvb->thread); | |
128 | dvb->thread = NULL; | |
129 | } | |
130 | up(&dvb->lock); | |
131 | return err; | |
132 | } | |
133 | ||
134 | /* ------------------------------------------------------------------ */ | |
135 | ||
136 | int videobuf_dvb_register(struct videobuf_dvb *dvb, | |
137 | struct module *module, | |
138 | void *adapter_priv) | |
139 | { | |
140 | int result; | |
141 | ||
142 | init_MUTEX(&dvb->lock); | |
143 | ||
144 | /* register adapter */ | |
145 | result = dvb_register_adapter(&dvb->adapter, dvb->name, module); | |
146 | if (result < 0) { | |
147 | printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n", | |
148 | dvb->name, result); | |
149 | goto fail_adapter; | |
150 | } | |
fdc53a6d | 151 | dvb->adapter.priv = adapter_priv; |
1da177e4 LT |
152 | |
153 | /* register frontend */ | |
fdc53a6d | 154 | result = dvb_register_frontend(&dvb->adapter, dvb->frontend); |
1da177e4 LT |
155 | if (result < 0) { |
156 | printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n", | |
157 | dvb->name, result); | |
158 | goto fail_frontend; | |
159 | } | |
160 | ||
161 | /* register demux stuff */ | |
162 | dvb->demux.dmx.capabilities = | |
163 | DMX_TS_FILTERING | DMX_SECTION_FILTERING | | |
164 | DMX_MEMORY_BASED_FILTERING; | |
165 | dvb->demux.priv = dvb; | |
166 | dvb->demux.filternum = 256; | |
167 | dvb->demux.feednum = 256; | |
168 | dvb->demux.start_feed = videobuf_dvb_start_feed; | |
169 | dvb->demux.stop_feed = videobuf_dvb_stop_feed; | |
170 | result = dvb_dmx_init(&dvb->demux); | |
171 | if (result < 0) { | |
172 | printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n", | |
173 | dvb->name, result); | |
174 | goto fail_dmx; | |
175 | } | |
176 | ||
177 | dvb->dmxdev.filternum = 256; | |
178 | dvb->dmxdev.demux = &dvb->demux.dmx; | |
179 | dvb->dmxdev.capabilities = 0; | |
fdc53a6d | 180 | result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter); |
1da177e4 LT |
181 | if (result < 0) { |
182 | printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n", | |
183 | dvb->name, result); | |
184 | goto fail_dmxdev; | |
185 | } | |
186 | ||
187 | dvb->fe_hw.source = DMX_FRONTEND_0; | |
188 | result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw); | |
189 | if (result < 0) { | |
190 | printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n", | |
191 | dvb->name, result); | |
192 | goto fail_fe_hw; | |
193 | } | |
194 | ||
195 | dvb->fe_mem.source = DMX_MEMORY_FE; | |
196 | result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem); | |
197 | if (result < 0) { | |
198 | printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n", | |
199 | dvb->name, result); | |
200 | goto fail_fe_mem; | |
201 | } | |
202 | ||
203 | result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw); | |
204 | if (result < 0) { | |
205 | printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n", | |
206 | dvb->name, result); | |
207 | goto fail_fe_conn; | |
208 | } | |
209 | ||
210 | /* register network adapter */ | |
fdc53a6d | 211 | dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx); |
1da177e4 LT |
212 | return 0; |
213 | ||
214 | fail_fe_conn: | |
215 | dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem); | |
216 | fail_fe_mem: | |
217 | dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw); | |
218 | fail_fe_hw: | |
219 | dvb_dmxdev_release(&dvb->dmxdev); | |
220 | fail_dmxdev: | |
221 | dvb_dmx_release(&dvb->demux); | |
222 | fail_dmx: | |
223 | dvb_unregister_frontend(dvb->frontend); | |
224 | fail_frontend: | |
fdc53a6d | 225 | dvb_unregister_adapter(&dvb->adapter); |
1da177e4 LT |
226 | fail_adapter: |
227 | return result; | |
228 | } | |
229 | ||
230 | void videobuf_dvb_unregister(struct videobuf_dvb *dvb) | |
231 | { | |
232 | dvb_net_release(&dvb->net); | |
233 | dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem); | |
234 | dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw); | |
235 | dvb_dmxdev_release(&dvb->dmxdev); | |
236 | dvb_dmx_release(&dvb->demux); | |
237 | dvb_unregister_frontend(dvb->frontend); | |
fdc53a6d | 238 | dvb_unregister_adapter(&dvb->adapter); |
1da177e4 LT |
239 | } |
240 | ||
241 | EXPORT_SYMBOL(videobuf_dvb_register); | |
242 | EXPORT_SYMBOL(videobuf_dvb_unregister); | |
243 | ||
244 | /* ------------------------------------------------------------------ */ | |
245 | /* | |
246 | * Local variables: | |
247 | * c-basic-offset: 8 | |
248 | * compile-command: "make DVB=1" | |
249 | * End: | |
250 | */ |