[linux-2.6-block.git] / drivers / media / v4l2-core / 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/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);
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>
5a0e3ad6	22	#include <linux/slab.h>
59d34489	23
7dfb7103	24	#include <linux/freezer.h>
1da177e4	25
59d34489	26	#include <media/videobuf-core.h>
ba366a23	27	#include <media/videobuf-dvb.h>
1da177e4 LT	28
	29	/* ------------------------------------------------------------------ */
	30
	31	MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
	32	MODULE_LICENSE("GPL");
	33
ff699e6b	34	static unsigned int debug;
1da177e4 LT	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
	43	static int videobuf_dvb_thread(void *data)
	44	{
	45	struct videobuf_dvb *dvb = data;
	46	struct videobuf_buffer *buf;
	47	unsigned long flags;
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);
5becbc58	59	videobuf_waiton(&dvb->dvbq, 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 */
f4fce60e	69	outp = videobuf_queue_to_vaddr(&dvb->dvbq, buf);
59d34489	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	141	short *adapter_nr,
9adf6132	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 */
5c96ebb7 JN	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);
e43f3fab DB	229	goto fail_fe_conn;
e43f3fab DB	230	}
1da177e4 LT	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:
f52a838b	244	dvb_frontend_detach(dvb->frontend);
e43f3fab	245	dvb->frontend = NULL;
363c35fc	246
1da177e4 LT	247	return result;
	248	}
	249
dcadd082 MCC	250	/* ------------------------------------------------------------------ */
	251	/* Register a single adapter and one or more frontends */
	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,
9adf6132	257	int mfe_shared)
dcadd082 MCC	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,
9adf6132	271	fe->dvb.name, adapter_nr, mfe_shared);
dcadd082 MCC	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
363c35fc	298	void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
1da177e4	299	{
878595f6	300	videobuf_dvb_dealloc_frontends(f);
363c35fc ST	301
	302	dvb_unregister_adapter(&f->adapter);
	303	}
11fbedd3	304	EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
363c35fc	305
11fbedd3 ST	306	struct videobuf_dvb_frontend *videobuf_dvb_get_frontend(
11fbedd3 ST	307	struct videobuf_dvb_frontends *f, int id)
363c35fc ST	308	{
	309	struct list_head list, q;
	310	struct videobuf_dvb_frontend fe, ret = NULL;
	311
	312	mutex_lock(&f->lock);
	313
7bdf84fc	314	list_for_each_safe(list, q, &f->felist) {
363c35fc ST	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	}
11fbedd3	326	EXPORT_SYMBOL(videobuf_dvb_get_frontend);
363c35fc	327
11fbedd3 ST	328	int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f,
11fbedd3 ST	329	struct dvb_frontend *p)
363c35fc ST	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
7bdf84fc	337	list_for_each_safe(list, q, &f->felist) {
363c35fc ST	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	}
11fbedd3	349	EXPORT_SYMBOL(videobuf_dvb_find_frontend);
363c35fc	350
11fbedd3 ST	351	struct videobuf_dvb_frontend *videobuf_dvb_alloc_frontend(
11fbedd3 ST	352	struct videobuf_dvb_frontends *f, int id)
363c35fc ST	353	{
	354	struct videobuf_dvb_frontend *fe;
	355
11fbedd3	356	fe = kzalloc(sizeof(struct videobuf_dvb_frontend), GFP_KERNEL);
363c35fc ST	357	if (fe == NULL)
	358	goto fail_alloc;
	359
363c35fc ST	360	fe->id = id;
	361	mutex_init(&fe->dvb.lock);
	362
	363	mutex_lock(&f->lock);
11fbedd3	364	list_add_tail(&fe->felist, &f->felist);
363c35fc ST	365	mutex_unlock(&f->lock);
	366
	367	fail_alloc:
	368	return fe;
1da177e4	369	}
363c35fc	370	EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
878595f6 DB	371
	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);