[linux-2.6-block.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-dma-sg.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;
	struct videobuf_dmabuf *dma;

	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 */
		dma=videobuf_to_dma(buf);
		if (buf->state == VIDEOBUF_DONE)
			dvb_dmx_swfilter(&dvb->demux, 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,
			  short *adapter_nr)
{
	int result;

	mutex_init(&dvb->lock);

	/* register adapter */
	result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device,
				      adapter_nr);
	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	24
c1accaa2	25	#include <media/videobuf-dma-sg.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;
c1accaa2	48	struct videobuf_dmabuf *dma;
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 */
c1accaa2	69	dma=videobuf_to_dma(buf);
0fc0686e	70	if (buf->state == VIDEOBUF_DONE)
c1accaa2	71	dvb_dmx_swfilter(&dvb->demux, dma->vmalloc,
1da177e4 LT	72	buf->size);
	73
	74	/* requeue buffer */
	75	list_add_tail(&buf->stream,&dvb->dvbq.stream);
	76	spin_lock_irqsave(dvb->dvbq.irqlock,flags);
	77	dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
	78	spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
	79	}
	80
	81	videobuf_read_stop(&dvb->dvbq);
	82	dprintk("dvb thread stopped\n");
	83
	84	/* Hmm, linux becomes very unhappy without this ... */
	85	while (!kthread_should_stop()) {
	86	set_current_state(TASK_INTERRUPTIBLE);
	87	schedule();
	88	}
	89	return 0;
	90	}
	91
	92	static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
	93	{
	94	struct dvb_demux *demux = feed->demux;
	95	struct videobuf_dvb *dvb = demux->priv;
	96	int rc;
	97
	98	if (!demux->dmx.frontend)
	99	return -EINVAL;
	100
3593cab5	101	mutex_lock(&dvb->lock);
1da177e4 LT	102	dvb->nfeeds++;
	103	rc = dvb->nfeeds;
	104
	105	if (NULL != dvb->thread)
	106	goto out;
	107	dvb->thread = kthread_run(videobuf_dvb_thread,
	108	dvb, "%s dvb", dvb->name);
	109	if (IS_ERR(dvb->thread)) {
	110	rc = PTR_ERR(dvb->thread);
	111	dvb->thread = NULL;
	112	}
	113
	114	out:
3593cab5	115	mutex_unlock(&dvb->lock);
1da177e4 LT	116	return rc;
	117	}
	118
	119	static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
	120	{
	121	struct dvb_demux *demux = feed->demux;
	122	struct videobuf_dvb *dvb = demux->priv;
	123	int err = 0;
	124
3593cab5	125	mutex_lock(&dvb->lock);
1da177e4 LT	126	dvb->nfeeds--;
	127	if (0 == dvb->nfeeds && NULL != dvb->thread) {
	128	// FIXME: cx8802_cancel_buffers(dev);
	129	err = kthread_stop(dvb->thread);
	130	dvb->thread = NULL;
	131	}
3593cab5	132	mutex_unlock(&dvb->lock);
1da177e4 LT	133	return err;
	134	}
	135
	136	/* ------------------------------------------------------------------ */
	137
	138	int videobuf_dvb_register(struct videobuf_dvb *dvb,
	139	struct module *module,
d09dbf92	140	void *adapter_priv,
78e92006 JG	141	struct device *device,
78e92006 JG	142	short *adapter_nr)
1da177e4 LT	143	{
	144	int result;
	145
3593cab5	146	mutex_init(&dvb->lock);
1da177e4 LT	147
1da177e4 LT	148	/* register adapter */
78e92006 JG	149	result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device,
78e92006 JG	150	adapter_nr);
1da177e4 LT	151	if (result < 0) {
	152	printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
	153	dvb->name, result);
	154	goto fail_adapter;
	155	}
fdc53a6d	156	dvb->adapter.priv = adapter_priv;
1da177e4 LT	157
1da177e4 LT	158	/* register frontend */
fdc53a6d	159	result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
1da177e4 LT	160	if (result < 0) {
	161	printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
	162	dvb->name, result);
	163	goto fail_frontend;
	164	}
	165
	166	/* register demux stuff */
	167	dvb->demux.dmx.capabilities =
	168	DMX_TS_FILTERING \| DMX_SECTION_FILTERING \|
	169	DMX_MEMORY_BASED_FILTERING;
	170	dvb->demux.priv = dvb;
	171	dvb->demux.filternum = 256;
	172	dvb->demux.feednum = 256;
	173	dvb->demux.start_feed = videobuf_dvb_start_feed;
	174	dvb->demux.stop_feed = videobuf_dvb_stop_feed;
	175	result = dvb_dmx_init(&dvb->demux);
	176	if (result < 0) {
	177	printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
	178	dvb->name, result);
	179	goto fail_dmx;
	180	}
	181
	182	dvb->dmxdev.filternum = 256;
	183	dvb->dmxdev.demux = &dvb->demux.dmx;
	184	dvb->dmxdev.capabilities = 0;
fdc53a6d	185	result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
1da177e4 LT	186	if (result < 0) {
	187	printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
	188	dvb->name, result);
	189	goto fail_dmxdev;
	190	}
	191
	192	dvb->fe_hw.source = DMX_FRONTEND_0;
	193	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	194	if (result < 0) {
	195	printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
	196	dvb->name, result);
	197	goto fail_fe_hw;
	198	}
	199
	200	dvb->fe_mem.source = DMX_MEMORY_FE;
	201	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	202	if (result < 0) {
	203	printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
	204	dvb->name, result);
	205	goto fail_fe_mem;
	206	}
	207
	208	result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	209	if (result < 0) {
	210	printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
	211	dvb->name, result);
	212	goto fail_fe_conn;
	213	}
	214
	215	/* register network adapter */
fdc53a6d	216	dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
1da177e4 LT	217	return 0;
	218
	219	fail_fe_conn:
	220	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	221	fail_fe_mem:
	222	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	223	fail_fe_hw:
	224	dvb_dmxdev_release(&dvb->dmxdev);
	225	fail_dmxdev:
	226	dvb_dmx_release(&dvb->demux);
	227	fail_dmx:
	228	dvb_unregister_frontend(dvb->frontend);
	229	fail_frontend:
f52a838b	230	dvb_frontend_detach(dvb->frontend);
fdc53a6d	231	dvb_unregister_adapter(&dvb->adapter);
1da177e4 LT	232	fail_adapter:
	233	return result;
	234	}
	235
	236	void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
	237	{
	238	dvb_net_release(&dvb->net);
	239	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	240	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	241	dvb_dmxdev_release(&dvb->dmxdev);
	242	dvb_dmx_release(&dvb->demux);
	243	dvb_unregister_frontend(dvb->frontend);
f52a838b	244	dvb_frontend_detach(dvb->frontend);
fdc53a6d	245	dvb_unregister_adapter(&dvb->adapter);
1da177e4 LT	246	}
	247
	248	EXPORT_SYMBOL(videobuf_dvb_register);
	249	EXPORT_SYMBOL(videobuf_dvb_unregister);
	250
	251	/* ------------------------------------------------------------------ */
	252	/*
	253	* Local variables:
	254	* c-basic-offset: 8
	255	* compile-command: "make DVB=1"
	256	* End:
	257	*/
674434c6	258