/home/lenb/src/to-linus-stable branch 'acpi-2.6.12'
[linux-2.6] / drivers / media / video / video-buf-dvb.c
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;
65                 try_to_freeze();
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         }
151         dvb->adapter.priv = adapter_priv;
152
153         /* register frontend */
154         result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
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;
180         result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
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 */
211         dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
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:
225         dvb_unregister_adapter(&dvb->adapter);
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);
238         dvb_unregister_adapter(&dvb->adapter);
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  */