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
31MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
32MODULE_LICENSE("GPL");
33
34static unsigned int debug;
35module_param(debug, int, 0644);
36MODULE_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
43static 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
93static 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
115out:
116	mutex_unlock(&dvb->lock);
117	return rc;
118}
119
120static 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
136static 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
161static 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
233fail_fe_conn:
234	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
235fail_fe_mem:
236	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
237fail_fe_hw:
238	dvb_dmxdev_release(&dvb->dmxdev);
239fail_dmxdev:
240	dvb_dmx_release(&dvb->demux);
241fail_dmx:
242	dvb_unregister_frontend(dvb->frontend);
243fail_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 */
252int 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
291err:
292	mutex_unlock(&f->lock);
293	videobuf_dvb_unregister_bus(f);
294	return res;
295}
296EXPORT_SYMBOL(videobuf_dvb_register_bus);
297
298void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
299{
300	videobuf_dvb_dealloc_frontends(f);
301
302	dvb_unregister_adapter(&f->adapter);
303}
304EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
305
306struct 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}
326EXPORT_SYMBOL(videobuf_dvb_get_frontend);
327
328int 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}
349EXPORT_SYMBOL(videobuf_dvb_find_frontend);
350
351struct 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
367fail_alloc:
368	return fe;
369}
370EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
371
372void 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}
398EXPORT_SYMBOL(videobuf_dvb_dealloc_frontends);
399