[deliverable/linux.git] / drivers / media / video / videobuf-dvb.c

/*
 *
 * 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/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;
	int err;
	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);
		err = videobuf_waiton(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_vmalloc (&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 */
	dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
	if (dvb->net.dvbdev == NULL) {
		result = -ENOMEM;
		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);
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	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>
59d34489	22
7dfb7103	23	#include <linux/freezer.h>
1da177e4	24
59d34489	25	#include <media/videobuf-core.h>
ba366a23	26	#include <media/videobuf-dvb.h>
1da177e4 LT	27
	28	/* ------------------------------------------------------------------ */
	29
	30	MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
	31	MODULE_LICENSE("GPL");
	32
ff699e6b	33	static unsigned int debug;
1da177e4 LT	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;
59d34489	48	void *outp;
1da177e4 LT	49
1da177e4 LT	50	dprintk("dvb thread started\n");
83144186	51	set_freezable();
1da177e4 LT	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);
1da177e4 LT	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;
3e1d1d28	66	try_to_freeze();
1da177e4 LT	67
1da177e4 LT	68	/* feed buffer data to demux */
59d34489 MCC	69	outp = videobuf_queue_to_vmalloc (&dvb->dvbq, buf);
59d34489 MCC	70
0fc0686e	71	if (buf->state == VIDEOBUF_DONE)
59d34489	72	dvb_dmx_swfilter(&dvb->demux, outp,
1da177e4 LT	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
3593cab5	102	mutex_lock(&dvb->lock);
1da177e4 LT	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:
3593cab5	116	mutex_unlock(&dvb->lock);
1da177e4 LT	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
3593cab5	126	mutex_lock(&dvb->lock);
1da177e4 LT	127	dvb->nfeeds--;
1da177e4 LT	128	if (0 == dvb->nfeeds && NULL != dvb->thread) {
1da177e4 LT	129	err = kthread_stop(dvb->thread);
	130	dvb->thread = NULL;
	131	}
3593cab5	132	mutex_unlock(&dvb->lock);
1da177e4 LT	133	return err;
	134	}
	135
dcadd082	136	static int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *fe,
1da177e4	137	struct module *module,
d09dbf92	138	void *adapter_priv,
78e92006	139	struct device *device,
363c35fc	140	char *adapter_name,
59b1842d DB	141	short *adapter_nr,
59b1842d DB	142	int mfe_shared)
1da177e4 LT	143	{
	144	int result;
	145
363c35fc	146	mutex_init(&fe->lock);
1da177e4 LT	147
1da177e4 LT	148	/* register adapter */
11fbedd3 ST	149	result = dvb_register_adapter(&fe->adapter, adapter_name, module,
11fbedd3 ST	150	device, adapter_nr);
1da177e4 LT	151	if (result < 0) {
1da177e4 LT	152	printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
363c35fc	153	adapter_name, result);
1da177e4	154	}
363c35fc	155	fe->adapter.priv = adapter_priv;
59b1842d	156	fe->adapter.mfe_shared = mfe_shared;
363c35fc ST	157
	158	return result;
	159	}
	160
dcadd082	161	static int videobuf_dvb_register_frontend(struct dvb_adapter *adapter,
11fbedd3	162	struct videobuf_dvb *dvb)
363c35fc ST	163	{
363c35fc ST	164	int result;
1da177e4 LT	165
1da177e4 LT	166	/* register frontend */
363c35fc	167	result = dvb_register_frontend(adapter, dvb->frontend);
1da177e4 LT	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;
363c35fc ST	193	result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
363c35fc ST	194
1da177e4 LT	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 */
363c35fc	225	dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
e43f3fab DB	226	if (dvb->net.dvbdev == NULL) {
	227	result = -ENOMEM;
	228	goto fail_fe_conn;
	229	}
1da177e4 LT	230	return 0;
	231
	232	fail_fe_conn:
	233	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	234	fail_fe_mem:
	235	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	236	fail_fe_hw:
	237	dvb_dmxdev_release(&dvb->dmxdev);
	238	fail_dmxdev:
	239	dvb_dmx_release(&dvb->demux);
	240	fail_dmx:
	241	dvb_unregister_frontend(dvb->frontend);
	242	fail_frontend:
f52a838b	243	dvb_frontend_detach(dvb->frontend);
e43f3fab	244	dvb->frontend = NULL;
363c35fc	245
1da177e4 LT	246	return result;
	247	}
	248
dcadd082 MCC	249	/* ------------------------------------------------------------------ */
	250	/* Register a single adapter and one or more frontends */
	251	int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
	252	struct module *module,
	253	void *adapter_priv,
	254	struct device *device,
	255	short *adapter_nr,
	256	int mfe_shared)
	257	{
	258	struct list_head list, q;
	259	struct videobuf_dvb_frontend *fe;
	260	int res;
	261
	262	fe = videobuf_dvb_get_frontend(f, 1);
	263	if (!fe) {
	264	printk(KERN_WARNING "Unable to register the adapter which has no frontends\n");
	265	return -EINVAL;
	266	}
	267
	268	/* Bring up the adapter */
	269	res = videobuf_dvb_register_adapter(f, module, adapter_priv, device,
	270	fe->dvb.name, adapter_nr, mfe_shared);
	271	if (res < 0) {
	272	printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
	273	return res;
	274	}
	275
	276	/* Attach all of the frontends to the adapter */
	277	mutex_lock(&f->lock);
	278	list_for_each_safe(list, q, &f->felist) {
	279	fe = list_entry(list, struct videobuf_dvb_frontend, felist);
	280	res = videobuf_dvb_register_frontend(&f->adapter, &fe->dvb);
	281	if (res < 0) {
	282	printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n",
	283	fe->dvb.name, res);
	284	goto err;
	285	}
	286	}
	287	mutex_unlock(&f->lock);
	288	return 0;
	289
	290	err:
	291	mutex_unlock(&f->lock);
	292	videobuf_dvb_unregister_bus(f);
	293	return res;
	294	}
	295	EXPORT_SYMBOL(videobuf_dvb_register_bus);
	296
363c35fc	297	void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
1da177e4	298	{
878595f6	299	videobuf_dvb_dealloc_frontends(f);
363c35fc ST	300
	301	dvb_unregister_adapter(&f->adapter);
	302	}
11fbedd3	303	EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
363c35fc	304
11fbedd3 ST	305	struct videobuf_dvb_frontend *videobuf_dvb_get_frontend(
11fbedd3 ST	306	struct videobuf_dvb_frontends *f, int id)
363c35fc ST	307	{
	308	struct list_head list, q;
	309	struct videobuf_dvb_frontend fe, ret = NULL;
	310
	311	mutex_lock(&f->lock);
	312
7bdf84fc	313	list_for_each_safe(list, q, &f->felist) {
363c35fc ST	314	fe = list_entry(list, struct videobuf_dvb_frontend, felist);
	315	if (fe->id == id) {
	316	ret = fe;
	317	break;
	318	}
	319	}
	320
	321	mutex_unlock(&f->lock);
	322
	323	return ret;
	324	}
11fbedd3	325	EXPORT_SYMBOL(videobuf_dvb_get_frontend);
363c35fc	326
11fbedd3 ST	327	int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f,
11fbedd3 ST	328	struct dvb_frontend *p)
363c35fc ST	329	{
	330	struct list_head list, q;
	331	struct videobuf_dvb_frontend *fe = NULL;
	332	int ret = 0;
	333
	334	mutex_lock(&f->lock);
	335
7bdf84fc	336	list_for_each_safe(list, q, &f->felist) {
363c35fc ST	337	fe = list_entry(list, struct videobuf_dvb_frontend, felist);
	338	if (fe->dvb.frontend == p) {
	339	ret = fe->id;
	340	break;
	341	}
	342	}
	343
	344	mutex_unlock(&f->lock);
	345
	346	return ret;
	347	}
11fbedd3	348	EXPORT_SYMBOL(videobuf_dvb_find_frontend);
363c35fc	349
11fbedd3 ST	350	struct videobuf_dvb_frontend *videobuf_dvb_alloc_frontend(
11fbedd3 ST	351	struct videobuf_dvb_frontends *f, int id)
363c35fc ST	352	{
	353	struct videobuf_dvb_frontend *fe;
	354
11fbedd3	355	fe = kzalloc(sizeof(struct videobuf_dvb_frontend), GFP_KERNEL);
363c35fc ST	356	if (fe == NULL)
	357	goto fail_alloc;
	358
363c35fc ST	359	fe->id = id;
	360	mutex_init(&fe->dvb.lock);
	361
	362	mutex_lock(&f->lock);
11fbedd3	363	list_add_tail(&fe->felist, &f->felist);
363c35fc ST	364	mutex_unlock(&f->lock);
	365
	366	fail_alloc:
	367	return fe;
1da177e4	368	}
363c35fc	369	EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
878595f6 DB	370
	371	void videobuf_dvb_dealloc_frontends(struct videobuf_dvb_frontends *f)
	372	{
	373	struct list_head list, q;
	374	struct videobuf_dvb_frontend *fe;
	375
	376	mutex_lock(&f->lock);
	377	list_for_each_safe(list, q, &f->felist) {
	378	fe = list_entry(list, struct videobuf_dvb_frontend, felist);
	379	if (fe->dvb.net.dvbdev) {
	380	dvb_net_release(&fe->dvb.net);
	381	fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
	382	&fe->dvb.fe_mem);
	383	fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
	384	&fe->dvb.fe_hw);
	385	dvb_dmxdev_release(&fe->dvb.dmxdev);
	386	dvb_dmx_release(&fe->dvb.demux);
	387	dvb_unregister_frontend(fe->dvb.frontend);
	388	}
	389	if (fe->dvb.frontend)
	390	/* always allocated, may have been reset */
	391	dvb_frontend_detach(fe->dvb.frontend);
	392	list_del(list); /* remove list entry */
	393	kfree(fe); /* free frontend allocation */
	394	}
	395	mutex_unlock(&f->lock);
	396	}
	397	EXPORT_SYMBOL(videobuf_dvb_dealloc_frontends);