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 #include <linux/slab.h>
23
24 #include <linux/freezer.h>
25
26 #include <media/videobuf-core.h>
27 #include <media/videobuf-dvb.h>
28
29 /* ------------------------------------------------------------------ */
30
31 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
32 MODULE_LICENSE("GPL");
33
34 static unsigned int debug;
35 module_param(debug, int, 0644);
36 MODULE_PARM_DESC(debug,"enable debug messages");
37
38 #define dprintk(fmt, arg...) if (debug) \
39 printk(KERN_DEBUG "%s/dvb: " fmt, dvb->name , ## arg)
40
41 /* ------------------------------------------------------------------ */
42
videobuf_dvb_thread(void * data)43 static int videobuf_dvb_thread(void *data)
44 {
45 struct videobuf_dvb *dvb = data;
46 struct videobuf_buffer *buf;
47 unsigned long flags;
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 videobuf_waiton(&dvb->dvbq, 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_vaddr(&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
videobuf_dvb_start_feed(struct dvb_demux_feed * feed)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
videobuf_dvb_stop_feed(struct dvb_demux_feed * feed)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
videobuf_dvb_register_adapter(struct videobuf_dvb_frontends * fe,struct module * module,void * adapter_priv,struct device * device,char * adapter_name,short * adapter_nr,int mfe_shared)136 static int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *fe,
137 struct module *module,
138 void *adapter_priv,
139 struct device *device,
140 char *adapter_name,
141 short *adapter_nr,
142 int mfe_shared)
143 {
144 int result;
145
146 mutex_init(&fe->lock);
147
148 /* register adapter */
149 result = dvb_register_adapter(&fe->adapter, adapter_name, module,
150 device, adapter_nr);
151 if (result < 0) {
152 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
153 adapter_name, result);
154 }
155 fe->adapter.priv = adapter_priv;
156 fe->adapter.mfe_shared = mfe_shared;
157
158 return result;
159 }
160
videobuf_dvb_register_frontend(struct dvb_adapter * adapter,struct videobuf_dvb * dvb)161 static int videobuf_dvb_register_frontend(struct dvb_adapter *adapter,
162 struct videobuf_dvb *dvb)
163 {
164 int result;
165
166 /* register frontend */
167 result = dvb_register_frontend(adapter, dvb->frontend);
168 if (result < 0) {
169 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
170 dvb->name, result);
171 goto fail_frontend;
172 }
173
174 /* register demux stuff */
175 dvb->demux.dmx.capabilities =
176 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
177 DMX_MEMORY_BASED_FILTERING;
178 dvb->demux.priv = dvb;
179 dvb->demux.filternum = 256;
180 dvb->demux.feednum = 256;
181 dvb->demux.start_feed = videobuf_dvb_start_feed;
182 dvb->demux.stop_feed = videobuf_dvb_stop_feed;
183 result = dvb_dmx_init(&dvb->demux);
184 if (result < 0) {
185 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
186 dvb->name, result);
187 goto fail_dmx;
188 }
189
190 dvb->dmxdev.filternum = 256;
191 dvb->dmxdev.demux = &dvb->demux.dmx;
192 dvb->dmxdev.capabilities = 0;
193 result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
194
195 if (result < 0) {
196 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
197 dvb->name, result);
198 goto fail_dmxdev;
199 }
200
201 dvb->fe_hw.source = DMX_FRONTEND_0;
202 result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
203 if (result < 0) {
204 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
205 dvb->name, result);
206 goto fail_fe_hw;
207 }
208
209 dvb->fe_mem.source = DMX_MEMORY_FE;
210 result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
211 if (result < 0) {
212 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
213 dvb->name, result);
214 goto fail_fe_mem;
215 }
216
217 result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
218 if (result < 0) {
219 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
220 dvb->name, result);
221 goto fail_fe_conn;
222 }
223
224 /* register network adapter */
225 result = dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
226 if (result < 0) {
227 printk(KERN_WARNING "%s: dvb_net_init failed (errno = %d)\n",
228 dvb->name, result);
229 goto fail_fe_conn;
230 }
231 return 0;
232
233 fail_fe_conn:
234 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
235 fail_fe_mem:
236 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
237 fail_fe_hw:
238 dvb_dmxdev_release(&dvb->dmxdev);
239 fail_dmxdev:
240 dvb_dmx_release(&dvb->demux);
241 fail_dmx:
242 dvb_unregister_frontend(dvb->frontend);
243 fail_frontend:
244 dvb_frontend_detach(dvb->frontend);
245 dvb->frontend = NULL;
246
247 return result;
248 }
249
250 /* ------------------------------------------------------------------ */
251 /* Register a single adapter and one or more frontends */
videobuf_dvb_register_bus(struct videobuf_dvb_frontends * f,struct module * module,void * adapter_priv,struct device * device,short * adapter_nr,int mfe_shared)252 int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
253 struct module *module,
254 void *adapter_priv,
255 struct device *device,
256 short *adapter_nr,
257 int mfe_shared)
258 {
259 struct list_head *list, *q;
260 struct videobuf_dvb_frontend *fe;
261 int res;
262
263 fe = videobuf_dvb_get_frontend(f, 1);
264 if (!fe) {
265 printk(KERN_WARNING "Unable to register the adapter which has no frontends\n");
266 return -EINVAL;
267 }
268
269 /* Bring up the adapter */
270 res = videobuf_dvb_register_adapter(f, module, adapter_priv, device,
271 fe->dvb.name, adapter_nr, mfe_shared);
272 if (res < 0) {
273 printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
274 return res;
275 }
276
277 /* Attach all of the frontends to the adapter */
278 mutex_lock(&f->lock);
279 list_for_each_safe(list, q, &f->felist) {
280 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
281 res = videobuf_dvb_register_frontend(&f->adapter, &fe->dvb);
282 if (res < 0) {
283 printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n",
284 fe->dvb.name, res);
285 goto err;
286 }
287 }
288 mutex_unlock(&f->lock);
289 return 0;
290
291 err:
292 mutex_unlock(&f->lock);
293 videobuf_dvb_unregister_bus(f);
294 return res;
295 }
296 EXPORT_SYMBOL(videobuf_dvb_register_bus);
297
videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends * f)298 void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
299 {
300 videobuf_dvb_dealloc_frontends(f);
301
302 dvb_unregister_adapter(&f->adapter);
303 }
304 EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
305
videobuf_dvb_get_frontend(struct videobuf_dvb_frontends * f,int id)306 struct videobuf_dvb_frontend *videobuf_dvb_get_frontend(
307 struct videobuf_dvb_frontends *f, int id)
308 {
309 struct list_head *list, *q;
310 struct videobuf_dvb_frontend *fe, *ret = NULL;
311
312 mutex_lock(&f->lock);
313
314 list_for_each_safe(list, q, &f->felist) {
315 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
316 if (fe->id == id) {
317 ret = fe;
318 break;
319 }
320 }
321
322 mutex_unlock(&f->lock);
323
324 return ret;
325 }
326 EXPORT_SYMBOL(videobuf_dvb_get_frontend);
327
videobuf_dvb_find_frontend(struct videobuf_dvb_frontends * f,struct dvb_frontend * p)328 int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f,
329 struct dvb_frontend *p)
330 {
331 struct list_head *list, *q;
332 struct videobuf_dvb_frontend *fe = NULL;
333 int ret = 0;
334
335 mutex_lock(&f->lock);
336
337 list_for_each_safe(list, q, &f->felist) {
338 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
339 if (fe->dvb.frontend == p) {
340 ret = fe->id;
341 break;
342 }
343 }
344
345 mutex_unlock(&f->lock);
346
347 return ret;
348 }
349 EXPORT_SYMBOL(videobuf_dvb_find_frontend);
350
videobuf_dvb_alloc_frontend(struct videobuf_dvb_frontends * f,int id)351 struct videobuf_dvb_frontend *videobuf_dvb_alloc_frontend(
352 struct videobuf_dvb_frontends *f, int id)
353 {
354 struct videobuf_dvb_frontend *fe;
355
356 fe = kzalloc(sizeof(struct videobuf_dvb_frontend), GFP_KERNEL);
357 if (fe == NULL)
358 goto fail_alloc;
359
360 fe->id = id;
361 mutex_init(&fe->dvb.lock);
362
363 mutex_lock(&f->lock);
364 list_add_tail(&fe->felist, &f->felist);
365 mutex_unlock(&f->lock);
366
367 fail_alloc:
368 return fe;
369 }
370 EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
371
videobuf_dvb_dealloc_frontends(struct videobuf_dvb_frontends * f)372 void videobuf_dvb_dealloc_frontends(struct videobuf_dvb_frontends *f)
373 {
374 struct list_head *list, *q;
375 struct videobuf_dvb_frontend *fe;
376
377 mutex_lock(&f->lock);
378 list_for_each_safe(list, q, &f->felist) {
379 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
380 if (fe->dvb.net.dvbdev) {
381 dvb_net_release(&fe->dvb.net);
382 fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
383 &fe->dvb.fe_mem);
384 fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
385 &fe->dvb.fe_hw);
386 dvb_dmxdev_release(&fe->dvb.dmxdev);
387 dvb_dmx_release(&fe->dvb.demux);
388 dvb_unregister_frontend(fe->dvb.frontend);
389 }
390 if (fe->dvb.frontend)
391 /* always allocated, may have been reset */
392 dvb_frontend_detach(fe->dvb.frontend);
393 list_del(list); /* remove list entry */
394 kfree(fe); /* free frontend allocation */
395 }
396 mutex_unlock(&f->lock);
397 }
398 EXPORT_SYMBOL(videobuf_dvb_dealloc_frontends);
399