V4L/DVB (8377): ivtv/cx18: ensure the default control values are correct
[linux-2.6] / drivers / media / video / videobuf-dvb.c
1 /*
2  *
3  * some helper function for simple DVB cards which simply DMA the
4  * complete transport stream and let the computer sort everything else
5  * (i.e. we are using the software demux, ...).  Also uses the
6  * video-buf to manage DMA buffers.
7  *
8  * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  */
15
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/device.h>
19 #include <linux/fs.h>
20 #include <linux/kthread.h>
21 #include <linux/file.h>
22
23 #include <linux/freezer.h>
24
25 #include <media/videobuf-core.h>
26 #include <media/videobuf-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;
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         void *outp;
49
50         dprintk("dvb thread started\n");
51         set_freezable();
52         videobuf_read_start(&dvb->dvbq);
53
54         for (;;) {
55                 /* fetch next buffer */
56                 buf = list_entry(dvb->dvbq.stream.next,
57                                  struct videobuf_buffer, stream);
58                 list_del(&buf->stream);
59                 err = videobuf_waiton(buf,0,1);
60
61                 /* no more feeds left or stop_feed() asked us to quit */
62                 if (0 == dvb->nfeeds)
63                         break;
64                 if (kthread_should_stop())
65                         break;
66                 try_to_freeze();
67
68                 /* feed buffer data to demux */
69                 outp = videobuf_queue_to_vmalloc (&dvb->dvbq, buf);
70
71                 if (buf->state == VIDEOBUF_DONE)
72                         dvb_dmx_swfilter(&dvb->demux, outp,
73                                          buf->size);
74
75                 /* requeue buffer */
76                 list_add_tail(&buf->stream,&dvb->dvbq.stream);
77                 spin_lock_irqsave(dvb->dvbq.irqlock,flags);
78                 dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
79                 spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
80         }
81
82         videobuf_read_stop(&dvb->dvbq);
83         dprintk("dvb thread stopped\n");
84
85         /* Hmm, linux becomes *very* unhappy without this ... */
86         while (!kthread_should_stop()) {
87                 set_current_state(TASK_INTERRUPTIBLE);
88                 schedule();
89         }
90         return 0;
91 }
92
93 static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
94 {
95         struct dvb_demux *demux  = feed->demux;
96         struct videobuf_dvb *dvb = demux->priv;
97         int rc;
98
99         if (!demux->dmx.frontend)
100                 return -EINVAL;
101
102         mutex_lock(&dvb->lock);
103         dvb->nfeeds++;
104         rc = dvb->nfeeds;
105
106         if (NULL != dvb->thread)
107                 goto out;
108         dvb->thread = kthread_run(videobuf_dvb_thread,
109                                   dvb, "%s dvb", dvb->name);
110         if (IS_ERR(dvb->thread)) {
111                 rc = PTR_ERR(dvb->thread);
112                 dvb->thread = NULL;
113         }
114
115 out:
116         mutex_unlock(&dvb->lock);
117         return rc;
118 }
119
120 static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
121 {
122         struct dvb_demux *demux  = feed->demux;
123         struct videobuf_dvb *dvb = demux->priv;
124         int err = 0;
125
126         mutex_lock(&dvb->lock);
127         dvb->nfeeds--;
128         if (0 == dvb->nfeeds  &&  NULL != dvb->thread) {
129                 // FIXME: cx8802_cancel_buffers(dev);
130                 err = kthread_stop(dvb->thread);
131                 dvb->thread = NULL;
132         }
133         mutex_unlock(&dvb->lock);
134         return err;
135 }
136
137 /* ------------------------------------------------------------------ */
138
139 int videobuf_dvb_register(struct videobuf_dvb *dvb,
140                           struct module *module,
141                           void *adapter_priv,
142                           struct device *device,
143                           short *adapter_nr)
144 {
145         int result;
146
147         mutex_init(&dvb->lock);
148
149         /* register adapter */
150         result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device,
151                                       adapter_nr);
152         if (result < 0) {
153                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
154                        dvb->name, result);
155                 goto fail_adapter;
156         }
157         dvb->adapter.priv = adapter_priv;
158
159         /* register frontend */
160         result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
161         if (result < 0) {
162                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
163                        dvb->name, result);
164                 goto fail_frontend;
165         }
166
167         /* register demux stuff */
168         dvb->demux.dmx.capabilities =
169                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
170                 DMX_MEMORY_BASED_FILTERING;
171         dvb->demux.priv       = dvb;
172         dvb->demux.filternum  = 256;
173         dvb->demux.feednum    = 256;
174         dvb->demux.start_feed = videobuf_dvb_start_feed;
175         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
176         result = dvb_dmx_init(&dvb->demux);
177         if (result < 0) {
178                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
179                        dvb->name, result);
180                 goto fail_dmx;
181         }
182
183         dvb->dmxdev.filternum    = 256;
184         dvb->dmxdev.demux        = &dvb->demux.dmx;
185         dvb->dmxdev.capabilities = 0;
186         result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
187         if (result < 0) {
188                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
189                        dvb->name, result);
190                 goto fail_dmxdev;
191         }
192
193         dvb->fe_hw.source = DMX_FRONTEND_0;
194         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
195         if (result < 0) {
196                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
197                        dvb->name, result);
198                 goto fail_fe_hw;
199         }
200
201         dvb->fe_mem.source = DMX_MEMORY_FE;
202         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
203         if (result < 0) {
204                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
205                        dvb->name, result);
206                 goto fail_fe_mem;
207         }
208
209         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
210         if (result < 0) {
211                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
212                        dvb->name, result);
213                 goto fail_fe_conn;
214         }
215
216         /* register network adapter */
217         dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
218         return 0;
219
220 fail_fe_conn:
221         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
222 fail_fe_mem:
223         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
224 fail_fe_hw:
225         dvb_dmxdev_release(&dvb->dmxdev);
226 fail_dmxdev:
227         dvb_dmx_release(&dvb->demux);
228 fail_dmx:
229         dvb_unregister_frontend(dvb->frontend);
230 fail_frontend:
231         dvb_frontend_detach(dvb->frontend);
232         dvb_unregister_adapter(&dvb->adapter);
233 fail_adapter:
234         return result;
235 }
236
237 void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
238 {
239         dvb_net_release(&dvb->net);
240         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
241         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
242         dvb_dmxdev_release(&dvb->dmxdev);
243         dvb_dmx_release(&dvb->demux);
244         dvb_unregister_frontend(dvb->frontend);
245         dvb_frontend_detach(dvb->frontend);
246         dvb_unregister_adapter(&dvb->adapter);
247 }
248
249 EXPORT_SYMBOL(videobuf_dvb_register);
250 EXPORT_SYMBOL(videobuf_dvb_unregister);
251
252 /* ------------------------------------------------------------------ */
253 /*
254  * Local variables:
255  * c-basic-offset: 8
256  * compile-command: "make DVB=1"
257  * End:
258  */