adf7674b4a02e234b870d2e9eeaf86da5749fad5
[linux-2.6.git] / 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                 err = kthread_stop(dvb->thread);
130                 dvb->thread = NULL;
131         }
132         mutex_unlock(&dvb->lock);
133         return err;
134 }
135
136 /* ------------------------------------------------------------------ */
137 /* Register a single adapter and one or more frontends */
138 int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
139                           struct module *module,
140                           void *adapter_priv,
141                           struct device *device,
142                           short *adapter_nr,
143                           int mfe_shared)
144 {
145         struct list_head *list, *q;
146         struct videobuf_dvb_frontend *fe;
147         int res;
148
149         fe = videobuf_dvb_get_frontend(f, 1);
150         if (!fe) {
151                 printk(KERN_WARNING "Unable to register the adapter which has no frontends\n");
152                 return -EINVAL;
153         }
154
155         /* Bring up the adapter */
156         res = videobuf_dvb_register_adapter(f, module, adapter_priv, device,
157                 fe->dvb.name, adapter_nr, mfe_shared);
158         if (res < 0) {
159                 printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
160                 return res;
161         }
162
163         /* Attach all of the frontends to the adapter */
164         mutex_lock(&f->lock);
165         list_for_each_safe(list, q, &f->felist) {
166                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
167                 res = videobuf_dvb_register_frontend(&f->adapter, &fe->dvb);
168                 if (res < 0) {
169                         printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n",
170                                 fe->dvb.name, res);
171                         goto err;
172                 }
173         }
174         mutex_unlock(&f->lock);
175         return 0;
176
177 err:
178         mutex_unlock(&f->lock);
179         videobuf_dvb_unregister_bus(f);
180         return res;
181 }
182 EXPORT_SYMBOL(videobuf_dvb_register_bus);
183
184 int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *fe,
185                           struct module *module,
186                           void *adapter_priv,
187                           struct device *device,
188                           char *adapter_name,
189                           short *adapter_nr,
190                           int mfe_shared)
191 {
192         int result;
193
194         mutex_init(&fe->lock);
195
196         /* register adapter */
197         result = dvb_register_adapter(&fe->adapter, adapter_name, module,
198                 device, adapter_nr);
199         if (result < 0) {
200                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
201                        adapter_name, result);
202         }
203         fe->adapter.priv = adapter_priv;
204         fe->adapter.mfe_shared = mfe_shared;
205
206         return result;
207 }
208
209 int videobuf_dvb_register_frontend(struct dvb_adapter *adapter,
210         struct videobuf_dvb *dvb)
211 {
212         int result;
213
214         /* register frontend */
215         result = dvb_register_frontend(adapter, dvb->frontend);
216         if (result < 0) {
217                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
218                        dvb->name, result);
219                 goto fail_frontend;
220         }
221
222         /* register demux stuff */
223         dvb->demux.dmx.capabilities =
224                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
225                 DMX_MEMORY_BASED_FILTERING;
226         dvb->demux.priv       = dvb;
227         dvb->demux.filternum  = 256;
228         dvb->demux.feednum    = 256;
229         dvb->demux.start_feed = videobuf_dvb_start_feed;
230         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
231         result = dvb_dmx_init(&dvb->demux);
232         if (result < 0) {
233                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
234                        dvb->name, result);
235                 goto fail_dmx;
236         }
237
238         dvb->dmxdev.filternum    = 256;
239         dvb->dmxdev.demux        = &dvb->demux.dmx;
240         dvb->dmxdev.capabilities = 0;
241         result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
242
243         if (result < 0) {
244                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
245                        dvb->name, result);
246                 goto fail_dmxdev;
247         }
248
249         dvb->fe_hw.source = DMX_FRONTEND_0;
250         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
251         if (result < 0) {
252                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
253                        dvb->name, result);
254                 goto fail_fe_hw;
255         }
256
257         dvb->fe_mem.source = DMX_MEMORY_FE;
258         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
259         if (result < 0) {
260                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
261                        dvb->name, result);
262                 goto fail_fe_mem;
263         }
264
265         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
266         if (result < 0) {
267                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
268                        dvb->name, result);
269                 goto fail_fe_conn;
270         }
271
272         /* register network adapter */
273         dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
274         if (dvb->net.dvbdev == NULL) {
275                 result = -ENOMEM;
276                 goto fail_fe_conn;
277         }
278         return 0;
279
280 fail_fe_conn:
281         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
282 fail_fe_mem:
283         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
284 fail_fe_hw:
285         dvb_dmxdev_release(&dvb->dmxdev);
286 fail_dmxdev:
287         dvb_dmx_release(&dvb->demux);
288 fail_dmx:
289         dvb_unregister_frontend(dvb->frontend);
290 fail_frontend:
291         dvb_frontend_detach(dvb->frontend);
292         dvb->frontend = NULL;
293
294         return result;
295 }
296
297 void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
298 {
299         struct list_head *list, *q;
300         struct videobuf_dvb_frontend *fe;
301
302         mutex_lock(&f->lock);
303         list_for_each_safe(list, q, &f->felist) {
304                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
305                 if (fe->dvb.net.dvbdev) {
306                         dvb_net_release(&fe->dvb.net);
307                         fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
308                                 &fe->dvb.fe_mem);
309                         fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
310                                 &fe->dvb.fe_hw);
311                         dvb_dmxdev_release(&fe->dvb.dmxdev);
312                         dvb_dmx_release(&fe->dvb.demux);
313                         dvb_unregister_frontend(fe->dvb.frontend);
314                 }
315                 if (fe->dvb.frontend)
316                         /* always allocated, may have been reset */
317                         dvb_frontend_detach(fe->dvb.frontend);
318                 list_del(list);
319                 kfree(fe);
320         }
321         mutex_unlock(&f->lock);
322
323         dvb_unregister_adapter(&f->adapter);
324 }
325 EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
326
327 struct videobuf_dvb_frontend *videobuf_dvb_get_frontend(
328         struct videobuf_dvb_frontends *f, int id)
329 {
330         struct list_head *list, *q;
331         struct videobuf_dvb_frontend *fe, *ret = NULL;
332
333         mutex_lock(&f->lock);
334
335         list_for_each_safe(list, q, &f->felist) {
336                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
337                 if (fe->id == id) {
338                         ret = fe;
339                         break;
340                 }
341         }
342
343         mutex_unlock(&f->lock);
344
345         return ret;
346 }
347 EXPORT_SYMBOL(videobuf_dvb_get_frontend);
348
349 int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f,
350         struct dvb_frontend *p)
351 {
352         struct list_head *list, *q;
353         struct videobuf_dvb_frontend *fe = NULL;
354         int ret = 0;
355
356         mutex_lock(&f->lock);
357
358         list_for_each_safe(list, q, &f->felist) {
359                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
360                 if (fe->dvb.frontend == p) {
361                         ret = fe->id;
362                         break;
363                 }
364         }
365
366         mutex_unlock(&f->lock);
367
368         return ret;
369 }
370 EXPORT_SYMBOL(videobuf_dvb_find_frontend);
371
372 struct videobuf_dvb_frontend *videobuf_dvb_alloc_frontend(
373         struct videobuf_dvb_frontends *f, int id)
374 {
375         struct videobuf_dvb_frontend *fe;
376
377         fe = kzalloc(sizeof(struct videobuf_dvb_frontend), GFP_KERNEL);
378         if (fe == NULL)
379                 goto fail_alloc;
380
381         fe->id = id;
382         mutex_init(&fe->dvb.lock);
383
384         mutex_lock(&f->lock);
385         list_add_tail(&fe->felist, &f->felist);
386         mutex_unlock(&f->lock);
387
388 fail_alloc:
389         return fe;
390 }
391 EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
392
393 /* ------------------------------------------------------------------ */
394 /*
395  * Local variables:
396  * c-basic-offset: 8
397  * compile-command: "make DVB=1"
398  * End:
399  */