V4L/DVB (9222): S2API: Add Multiple-frontend on a single adapter support.
[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                 // 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 /* Register a single adapter and one or more frontends */
139 int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
140                           struct module *module,
141                           void *adapter_priv,
142                           struct device *device,
143                           short *adapter_nr) //NEW
144 {
145         struct list_head *list, *q;
146         struct videobuf_dvb_frontend *fe;
147         int res = -EINVAL;
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                 goto err;
153         }
154
155         /* Bring up the adapter */
156         res = videobuf_dvb_register_adapter(f, module, adapter_priv, device, fe->dvb.name, adapter_nr); //NEW
157         if (res < 0) {
158                 printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
159                 goto err;
160         }
161
162         /* Attach all of the frontends to the adapter */
163         mutex_lock(&f->lock);
164         list_for_each_safe(list, q, &f->frontend.felist) {
165                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
166
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                 }
172         }
173         mutex_unlock(&f->lock);
174
175 err:
176         return res;
177 }
178
179 int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *fe,
180                           struct module *module,
181                           void *adapter_priv,
182                           struct device *device,
183                           char *adapter_name,
184                           short *adapter_nr) //NEW
185 {
186         int result;
187
188         mutex_init(&fe->lock);
189
190         /* register adapter */
191         result = dvb_register_adapter(&fe->adapter, adapter_name, module, device, adapter_nr);
192         if (result < 0) {
193                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
194                        adapter_name, result);
195         }
196         fe->adapter.priv = adapter_priv;
197
198         return result;
199 }
200
201 int videobuf_dvb_register_frontend(struct dvb_adapter *adapter, struct videobuf_dvb *dvb)
202 {
203         int result;
204
205         /* register frontend */
206         result = dvb_register_frontend(adapter, dvb->frontend);
207         if (result < 0) {
208                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
209                        dvb->name, result);
210                 goto fail_frontend;
211         }
212
213         /* register demux stuff */
214         dvb->demux.dmx.capabilities =
215                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
216                 DMX_MEMORY_BASED_FILTERING;
217         dvb->demux.priv       = dvb;
218         dvb->demux.filternum  = 256;
219         dvb->demux.feednum    = 256;
220         dvb->demux.start_feed = videobuf_dvb_start_feed;
221         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
222         result = dvb_dmx_init(&dvb->demux);
223         if (result < 0) {
224                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
225                        dvb->name, result);
226                 goto fail_dmx;
227         }
228
229         dvb->dmxdev.filternum    = 256;
230         dvb->dmxdev.demux        = &dvb->demux.dmx;
231         dvb->dmxdev.capabilities = 0;
232         //result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
233         result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
234
235         if (result < 0) {
236                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
237                        dvb->name, result);
238                 goto fail_dmxdev;
239         }
240
241         dvb->fe_hw.source = DMX_FRONTEND_0;
242         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
243         if (result < 0) {
244                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
245                        dvb->name, result);
246                 goto fail_fe_hw;
247         }
248
249         dvb->fe_mem.source = DMX_MEMORY_FE;
250         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
251         if (result < 0) {
252                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
253                        dvb->name, result);
254                 goto fail_fe_mem;
255         }
256
257         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
258         if (result < 0) {
259                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
260                        dvb->name, result);
261                 goto fail_fe_conn;
262         }
263
264         /* register network adapter */
265         dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
266         return 0;
267
268 fail_fe_conn:
269         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
270 fail_fe_mem:
271         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
272 fail_fe_hw:
273         dvb_dmxdev_release(&dvb->dmxdev);
274 fail_dmxdev:
275         dvb_dmx_release(&dvb->demux);
276 fail_dmx:
277         dvb_unregister_frontend(dvb->frontend);
278 fail_frontend:
279         dvb_frontend_detach(dvb->frontend);
280         dvb_unregister_adapter(&dvb->adapter);
281
282         return result;
283 }
284
285 void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
286 {
287         struct list_head *list, *q;
288         struct videobuf_dvb_frontend *fe;
289
290         mutex_lock(&f->lock);
291         list_for_each_safe(list, q, &f->frontend.felist) {
292                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
293
294                 dvb_net_release(&fe->dvb.net);
295                 fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_mem);
296                 fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_hw);
297                 dvb_dmxdev_release(&fe->dvb.dmxdev);
298                 dvb_dmx_release(&fe->dvb.demux);
299                 dvb_unregister_frontend(fe->dvb.frontend);
300                 dvb_frontend_detach(fe->dvb.frontend);
301
302                 list_del(list);
303                 kfree(fe);
304         }
305         mutex_unlock(&f->lock);
306
307         dvb_unregister_adapter(&f->adapter);
308 }
309
310 struct videobuf_dvb_frontend * videobuf_dvb_get_frontend(struct videobuf_dvb_frontends *f, int id)
311 {
312         struct list_head *list, *q;
313         struct videobuf_dvb_frontend *fe, *ret = NULL;
314
315         mutex_lock(&f->lock);
316
317         list_for_each_safe(list, q, &f->frontend.felist) {
318                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
319                 if (fe->id == id) {
320                         ret = fe;
321                         break;
322                 }
323         }
324
325         mutex_unlock(&f->lock);
326
327         return ret;
328 }
329
330 int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f, struct dvb_frontend *p)
331 {
332         struct list_head *list, *q;
333         struct videobuf_dvb_frontend *fe = NULL;
334         int ret = 0;
335
336         mutex_lock(&f->lock);
337
338         list_for_each_safe(list, q, &f->frontend.felist) {
339                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
340                 if (fe->dvb.frontend == p) {
341                         ret = fe->id;
342                         break;
343                 }
344         }
345
346         mutex_unlock(&f->lock);
347
348         return ret;
349 }
350
351 struct videobuf_dvb_frontend * videobuf_dvb_alloc_frontend(void *private, struct videobuf_dvb_frontends *f, int id)
352 {
353         struct videobuf_dvb_frontend *fe;
354
355         fe = kzalloc(sizeof(struct videobuf_dvb_frontend),GFP_KERNEL);
356         if (fe == NULL)
357                 goto fail_alloc;
358
359         fe->dev = private;
360         fe->id = id;
361         mutex_init(&fe->dvb.lock);
362
363         mutex_lock(&f->lock);
364         list_add_tail(&fe->felist,&f->frontend.felist);
365         mutex_unlock(&f->lock);
366
367 fail_alloc:
368         return fe;
369 }
370
371 EXPORT_SYMBOL(videobuf_dvb_register_bus);
372 EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
373 EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
374 EXPORT_SYMBOL(videobuf_dvb_get_frontend);
375 EXPORT_SYMBOL(videobuf_dvb_find_frontend);
376
377 /* ------------------------------------------------------------------ */
378 /*
379  * Local variables:
380  * c-basic-offset: 8
381  * compile-command: "make DVB=1"
382  * End:
383  */