aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/videobuf-dvb.c
blob: b7efa4516d367944e9f44c385c725f05280daf60 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
/*
 *
 * some helper function for simple DVB cards which simply DMA the
 * complete transport stream and let the computer sort everything else
 * (i.e. we are using the software demux, ...).  Also uses the
 * video-buf to manage DMA buffers.
 *
 * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/kthread.h>
#include <linux/file.h>
#include <linux/slab.h>

#include <linux/freezer.h>

#include <media/videobuf-core.h>
#include <media/videobuf-dvb.h>

/* ------------------------------------------------------------------ */

MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
MODULE_LICENSE("GPL");

static unsigned int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug,"enable debug messages");

#define dprintk(fmt, arg...)	if (debug)			\
	printk(KERN_DEBUG "%s/dvb: " fmt, dvb->name , ## arg)

/* ------------------------------------------------------------------ */

static int videobuf_dvb_thread(void *data)
{
	struct videobuf_dvb *dvb = data;
	struct videobuf_buffer *buf;
	unsigned long flags;
	void *outp;

	dprintk("dvb thread started\n");
	set_freezable();
	videobuf_read_start(&dvb->dvbq);

	for (;;) {
		/* fetch next buffer */
		buf = list_entry(dvb->dvbq.stream.next,
				 struct videobuf_buffer, stream);
		list_del(&buf->stream);
		videobuf_waiton(&dvb->dvbq, buf, 0, 1);

		/* no more feeds left or stop_feed() asked us to quit */
		if (0 == dvb->nfeeds)
			break;
		if (kthread_should_stop())
			break;
		try_to_freeze();

		/* feed buffer data to demux */
		outp = videobuf_queue_to_vaddr(&dvb->dvbq, buf);

		if (buf->state == VIDEOBUF_DONE)
			dvb_dmx_swfilter(&dvb->demux, outp,
					 buf->size);

		/* requeue buffer */
		list_add_tail(&buf->stream,&dvb->dvbq.stream);
		spin_lock_irqsave(dvb->dvbq.irqlock,flags);
		dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
		spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
	}

	videobuf_read_stop(&dvb->dvbq);
	dprintk("dvb thread stopped\n");

	/* Hmm, linux becomes *very* unhappy without this ... */
	while (!kthread_should_stop()) {
		set_current_state(TASK_INTERRUPTIBLE);
		schedule();
	}
	return 0;
}

static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
{
	struct dvb_demux *demux  = feed->demux;
	struct videobuf_dvb *dvb = demux->priv;
	int rc;

	if (!demux->dmx.frontend)
		return -EINVAL;

	mutex_lock(&dvb->lock);
	dvb->nfeeds++;
	rc = dvb->nfeeds;

	if (NULL != dvb->thread)
		goto out;
	dvb->thread = kthread_run(videobuf_dvb_thread,
				  dvb, "%s dvb", dvb->name);
	if (IS_ERR(dvb->thread)) {
		rc = PTR_ERR(dvb->thread);
		dvb->thread = NULL;
	}

out:
	mutex_unlock(&dvb->lock);
	return rc;
}

static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
{
	struct dvb_demux *demux  = feed->demux;
	struct videobuf_dvb *dvb = demux->priv;
	int err = 0;

	mutex_lock(&dvb->lock);
	dvb->nfeeds--;
	if (0 == dvb->nfeeds  &&  NULL != dvb->thread) {
		err = kthread_stop(dvb->thread);
		dvb->thread = NULL;
	}
	mutex_unlock(&dvb->lock);
	return err;
}

static int 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)
{
	int result;

	mutex_init(&fe->lock);

	/* register adapter */
	result = dvb_register_adapter(&fe->adapter, adapter_name, module,
		device, adapter_nr);
	if (result < 0) {
		printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
		       adapter_name, result);
	}
	fe->adapter.priv = adapter_priv;
	fe->adapter.mfe_shared = mfe_shared;

	return result;
}

static int videobuf_dvb_register_frontend(struct dvb_adapter *adapter,
	struct videobuf_dvb *dvb)
{
	int result;

	/* register frontend */
	result = dvb_register_frontend(adapter, dvb->frontend);
	if (result < 0) {
		printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
		       dvb->name, result);
		goto fail_frontend;
	}

	/* register demux stuff */
	dvb->demux.dmx.capabilities =
		DMX_TS_FILTERING | DMX_SECTION_FILTERING |
		DMX_MEMORY_BASED_FILTERING;
	dvb->demux.priv       = dvb;
	dvb->demux.filternum  = 256;
	dvb->demux.feednum    = 256;
	dvb->demux.start_feed = videobuf_dvb_start_feed;
	dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
	result = dvb_dmx_init(&dvb->demux);
	if (result < 0) {
		printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
		       dvb->name, result);
		goto fail_dmx;
	}

	dvb->dmxdev.filternum    = 256;
	dvb->dmxdev.demux        = &dvb->demux.dmx;
	dvb->dmxdev.capabilities = 0;
	result = dvb_dmxdev_init(&dvb->dmxdev, adapter);

	if (result < 0) {
		printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
		       dvb->name, result);
		goto fail_dmxdev;
	}

	dvb->fe_hw.source = DMX_FRONTEND_0;
	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	if (result < 0) {
		printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
		       dvb->name, result);
		goto fail_fe_hw;
	}

	dvb->fe_mem.source = DMX_MEMORY_FE;
	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	if (result < 0) {
		printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
		       dvb->name, result);
		goto fail_fe_mem;
	}

	result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	if (result < 0) {
		printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
		       dvb->name, result);
		goto fail_fe_conn;
	}

	/* register network adapter */
	result = dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
	if (result < 0) {
		printk(KERN_WARNING "%s: dvb_net_init failed (errno = %d)\n",
		       dvb->name, result);
		goto fail_fe_conn;
	}
	return 0;

fail_fe_conn:
	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
fail_fe_mem:
	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
fail_fe_hw:
	dvb_dmxdev_release(&dvb->dmxdev);
fail_dmxdev:
	dvb_dmx_release(&dvb->demux);
fail_dmx:
	dvb_unregister_frontend(dvb->frontend);
fail_frontend:
	dvb_frontend_detach(dvb->frontend);
	dvb->frontend = NULL;

	return result;
}

/* ------------------------------------------------------------------ */
/* Register a single adapter and one or more frontends */
int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
			  struct module *module,
			  void *adapter_priv,
			  struct device *device,
			  short *adapter_nr,
			  int mfe_shared)
{
	struct list_head *list, *q;
	struct videobuf_dvb_frontend *fe;
	int res;

	fe = videobuf_dvb_get_frontend(f, 1);
	if (!fe) {
		printk(KERN_WARNING "Unable to register the adapter which has no frontends\n");
		return -EINVAL;
	}

	/* Bring up the adapter */
	res = videobuf_dvb_register_adapter(f, module, adapter_priv, device,
		fe->dvb.name, adapter_nr, mfe_shared);
	if (res < 0) {
		printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
		return res;
	}

	/* Attach all of the frontends to the adapter */
	mutex_lock(&f->lock);
	list_for_each_safe(list, q, &f->felist) {
		fe = list_entry(list, struct videobuf_dvb_frontend, felist);
		res = videobuf_dvb_register_frontend(&f->adapter, &fe->dvb);
		if (res < 0) {
			printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n",
				fe->dvb.name, res);
			goto err;
		}
	}
	mutex_unlock(&f->lock);
	return 0;

err:
	mutex_unlock(&f->lock);
	videobuf_dvb_unregister_bus(f);
	return res;
}
EXPORT_SYMBOL(videobuf_dvb_register_bus);

void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
{
	videobuf_dvb_dealloc_frontends(f);

	dvb_unregister_adapter(&f->adapter);
}
EXPORT_SYMBOL(videobuf_dvb_unregister_bus);

struct videobuf_dvb_frontend *videobuf_dvb_get_frontend(
	struct videobuf_dvb_frontends *f, int id)
{
	struct list_head *list, *q;
	struct videobuf_dvb_frontend *fe, *ret = NULL;

	mutex_lock(&f->lock);

	list_for_each_safe(list, q, &f->felist) {
		fe = list_entry(list, struct videobuf_dvb_frontend, felist);
		if (fe->id == id) {
			ret = fe;
			break;
		}
	}

	mutex_unlock(&f->lock);

	return ret;
}
EXPORT_SYMBOL(videobuf_dvb_get_frontend);

int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f,
	struct dvb_frontend *p)
{
	struct list_head *list, *q;
	struct videobuf_dvb_frontend *fe = NULL;
	int ret = 0;

	mutex_lock(&f->lock);

	list_for_each_safe(list, q, &f->felist) {
		fe = list_entry(list, struct videobuf_dvb_frontend, felist);
		if (fe->dvb.frontend == p) {
			ret = fe->id;
			break;
		}
	}

	mutex_unlock(&f->lock);

	return ret;
}
EXPORT_SYMBOL(videobuf_dvb_find_frontend);

struct videobuf_dvb_frontend *videobuf_dvb_alloc_frontend(
	struct videobuf_dvb_frontends *f, int id)
{
	struct videobuf_dvb_frontend *fe;

	fe = kzalloc(sizeof(struct videobuf_dvb_frontend), GFP_KERNEL);
	if (fe == NULL)
		goto fail_alloc;

	fe->id = id;
	mutex_init(&fe->dvb.lock);

	mutex_lock(&f->lock);
	list_add_tail(&fe->felist, &f->felist);
	mutex_unlock(&f->lock);

fail_alloc:
	return fe;
}
EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);

void videobuf_dvb_dealloc_frontends(struct videobuf_dvb_frontends *f)
{
	struct list_head *list, *q;
	struct videobuf_dvb_frontend *fe;

	mutex_lock(&f->lock);
	list_for_each_safe(list, q, &f->felist) {
		fe = list_entry(list, struct videobuf_dvb_frontend, felist);
		if (fe->dvb.net.dvbdev) {
			dvb_net_release(&fe->dvb.net);
			fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
				&fe->dvb.fe_mem);
			fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
				&fe->dvb.fe_hw);
			dvb_dmxdev_release(&fe->dvb.dmxdev);
			dvb_dmx_release(&fe->dvb.demux);
			dvb_unregister_frontend(fe->dvb.frontend);
		}
		if (fe->dvb.frontend)
			/* always allocated, may have been reset */
			dvb_frontend_detach(fe->dvb.frontend);
		list_del(list); /* remove list entry */
		kfree(fe);	/* free frontend allocation */
	}
	mutex_unlock(&f->lock);
}
EXPORT_SYMBOL(videobuf_dvb_dealloc_frontends);

Privacy Policy