[deliverable/linux.git] / drivers / media / video / video-buf-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/video-buf.h>
#include <media/video-buf-dvb.h>

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

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

static unsigned int debug = 0;
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;

	dprintk("dvb thread started\n");
	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);
		BUG_ON(0 != err);

		/* 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 */
		if (buf->state == STATE_DONE)
			dvb_dmx_swfilter(&dvb->demux, buf->dma.vmalloc,
					 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) {
		// FIXME: cx8802_cancel_buffers(dev);
		err = kthread_stop(dvb->thread);
		dvb->thread = NULL;
	}
	mutex_unlock(&dvb->lock);
	return err;
}

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

int videobuf_dvb_register(struct videobuf_dvb *dvb,
			  struct module *module,
			  void *adapter_priv,
			  struct device *device)
{
	int result;

	mutex_init(&dvb->lock);

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

	/* register frontend */
	result = dvb_register_frontend(&dvb->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, &dvb->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(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
	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_unregister_adapter(&dvb->adapter);
fail_adapter:
	return result;
}

void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
{
	dvb_net_release(&dvb->net);
	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	dvb_dmxdev_release(&dvb->dmxdev);
	dvb_dmx_release(&dvb->demux);
	dvb_unregister_frontend(dvb->frontend);
	dvb_frontend_detach(dvb->frontend);
	dvb_unregister_adapter(&dvb->adapter);
}

EXPORT_SYMBOL(videobuf_dvb_register);
EXPORT_SYMBOL(videobuf_dvb_unregister);

/* ------------------------------------------------------------------ */
/*
 * Local variables:
 * c-basic-offset: 8
 * compile-command: "make DVB=1"
 * End:
 */
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
674434c6	16
1da177e4 LT	17	#include <linux/module.h>
	18	#include <linux/init.h>
	19	#include <linux/device.h>
	20	#include <linux/fs.h>
	21	#include <linux/kthread.h>
	22	#include <linux/file.h>
7dfb7103	23	#include <linux/freezer.h>
1da177e4 LT	24
	25	#include <media/video-buf.h>
	26	#include <media/video-buf-dvb.h>
	27
	28	/* ------------------------------------------------------------------ */
	29
	30	MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
	31	MODULE_LICENSE("GPL");
	32
	33	static unsigned int debug = 0;
	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;
	48
	49	dprintk("dvb thread started\n");
	50	videobuf_read_start(&dvb->dvbq);
	51
	52	for (;;) {
	53	/* fetch next buffer */
	54	buf = list_entry(dvb->dvbq.stream.next,
	55	struct videobuf_buffer, stream);
	56	list_del(&buf->stream);
	57	err = videobuf_waiton(buf,0,1);
	58	BUG_ON(0 != err);
	59
	60	/* no more feeds left or stop_feed() asked us to quit */
	61	if (0 == dvb->nfeeds)
	62	break;
	63	if (kthread_should_stop())
	64	break;
3e1d1d28	65	try_to_freeze();
1da177e4 LT	66
	67	/* feed buffer data to demux */
	68	if (buf->state == STATE_DONE)
	69	dvb_dmx_swfilter(&dvb->demux, buf->dma.vmalloc,
	70	buf->size);
	71
	72	/* requeue buffer */
	73	list_add_tail(&buf->stream,&dvb->dvbq.stream);
	74	spin_lock_irqsave(dvb->dvbq.irqlock,flags);
	75	dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
	76	spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
	77	}
	78
	79	videobuf_read_stop(&dvb->dvbq);
	80	dprintk("dvb thread stopped\n");
	81
	82	/* Hmm, linux becomes very unhappy without this ... */
	83	while (!kthread_should_stop()) {
	84	set_current_state(TASK_INTERRUPTIBLE);
	85	schedule();
	86	}
	87	return 0;
	88	}
	89
	90	static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
	91	{
	92	struct dvb_demux *demux = feed->demux;
	93	struct videobuf_dvb *dvb = demux->priv;
	94	int rc;
	95
	96	if (!demux->dmx.frontend)
	97	return -EINVAL;
	98
3593cab5	99	mutex_lock(&dvb->lock);
1da177e4 LT	100	dvb->nfeeds++;
	101	rc = dvb->nfeeds;
	102
	103	if (NULL != dvb->thread)
	104	goto out;
	105	dvb->thread = kthread_run(videobuf_dvb_thread,
	106	dvb, "%s dvb", dvb->name);
	107	if (IS_ERR(dvb->thread)) {
	108	rc = PTR_ERR(dvb->thread);
	109	dvb->thread = NULL;
	110	}
	111
	112	out:
3593cab5	113	mutex_unlock(&dvb->lock);
1da177e4 LT	114	return rc;
	115	}
	116
	117	static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
	118	{
	119	struct dvb_demux *demux = feed->demux;
	120	struct videobuf_dvb *dvb = demux->priv;
	121	int err = 0;
	122
3593cab5	123	mutex_lock(&dvb->lock);
1da177e4 LT	124	dvb->nfeeds--;
	125	if (0 == dvb->nfeeds && NULL != dvb->thread) {
	126	// FIXME: cx8802_cancel_buffers(dev);
	127	err = kthread_stop(dvb->thread);
	128	dvb->thread = NULL;
	129	}
3593cab5	130	mutex_unlock(&dvb->lock);
1da177e4 LT	131	return err;
	132	}
	133
	134	/* ------------------------------------------------------------------ */
	135
	136	int videobuf_dvb_register(struct videobuf_dvb *dvb,
	137	struct module *module,
d09dbf92 AQ	138	void *adapter_priv,
d09dbf92 AQ	139	struct device *device)
1da177e4 LT	140	{
	141	int result;
	142
3593cab5	143	mutex_init(&dvb->lock);
1da177e4 LT	144
1da177e4 LT	145	/* register adapter */
d09dbf92	146	result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device);
1da177e4 LT	147	if (result < 0) {
	148	printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
	149	dvb->name, result);
	150	goto fail_adapter;
	151	}
fdc53a6d	152	dvb->adapter.priv = adapter_priv;
1da177e4 LT	153
1da177e4 LT	154	/* register frontend */
fdc53a6d	155	result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
1da177e4 LT	156	if (result < 0) {
	157	printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
	158	dvb->name, result);
	159	goto fail_frontend;
	160	}
	161
	162	/* register demux stuff */
	163	dvb->demux.dmx.capabilities =
	164	DMX_TS_FILTERING \| DMX_SECTION_FILTERING \|
	165	DMX_MEMORY_BASED_FILTERING;
	166	dvb->demux.priv = dvb;
	167	dvb->demux.filternum = 256;
	168	dvb->demux.feednum = 256;
	169	dvb->demux.start_feed = videobuf_dvb_start_feed;
	170	dvb->demux.stop_feed = videobuf_dvb_stop_feed;
	171	result = dvb_dmx_init(&dvb->demux);
	172	if (result < 0) {
	173	printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
	174	dvb->name, result);
	175	goto fail_dmx;
	176	}
	177
	178	dvb->dmxdev.filternum = 256;
	179	dvb->dmxdev.demux = &dvb->demux.dmx;
	180	dvb->dmxdev.capabilities = 0;
fdc53a6d	181	result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
1da177e4 LT	182	if (result < 0) {
	183	printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
	184	dvb->name, result);
	185	goto fail_dmxdev;
	186	}
	187
	188	dvb->fe_hw.source = DMX_FRONTEND_0;
	189	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	190	if (result < 0) {
	191	printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
	192	dvb->name, result);
	193	goto fail_fe_hw;
	194	}
	195
	196	dvb->fe_mem.source = DMX_MEMORY_FE;
	197	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	198	if (result < 0) {
	199	printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
	200	dvb->name, result);
	201	goto fail_fe_mem;
	202	}
	203
	204	result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	205	if (result < 0) {
	206	printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
	207	dvb->name, result);
	208	goto fail_fe_conn;
	209	}
	210
	211	/* register network adapter */
fdc53a6d	212	dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
1da177e4 LT	213	return 0;
	214
	215	fail_fe_conn:
	216	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	217	fail_fe_mem:
	218	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	219	fail_fe_hw:
	220	dvb_dmxdev_release(&dvb->dmxdev);
	221	fail_dmxdev:
	222	dvb_dmx_release(&dvb->demux);
	223	fail_dmx:
	224	dvb_unregister_frontend(dvb->frontend);
	225	fail_frontend:
f52a838b	226	dvb_frontend_detach(dvb->frontend);
fdc53a6d	227	dvb_unregister_adapter(&dvb->adapter);
1da177e4 LT	228	fail_adapter:
	229	return result;
	230	}
	231
	232	void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
	233	{
	234	dvb_net_release(&dvb->net);
	235	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	236	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	237	dvb_dmxdev_release(&dvb->dmxdev);
	238	dvb_dmx_release(&dvb->demux);
	239	dvb_unregister_frontend(dvb->frontend);
f52a838b	240	dvb_frontend_detach(dvb->frontend);
fdc53a6d	241	dvb_unregister_adapter(&dvb->adapter);
1da177e4 LT	242	}
	243
	244	EXPORT_SYMBOL(videobuf_dvb_register);
	245	EXPORT_SYMBOL(videobuf_dvb_unregister);
	246
	247	/* ------------------------------------------------------------------ */
	248	/*
	249	* Local variables:
	250	* c-basic-offset: 8
	251	* compile-command: "make DVB=1"
	252	* End:
	253	*/
674434c6	254