[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/suspend.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;

	down(&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:
	up(&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;

	down(&dvb->lock);
	dvb->nfeeds--;
	if (0 == dvb->nfeeds  &&  NULL != dvb->thread) {
		// FIXME: cx8802_cancel_buffers(dev);
		err = kthread_stop(dvb->thread);
		dvb->thread = NULL;
	}
	up(&dvb->lock);
	return err;
}

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

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

	init_MUTEX(&dvb->lock);

	/* register adapter */
	result = dvb_register_adapter(&dvb->adapter, dvb->name, module);
	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_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_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>
	23	#include <linux/suspend.h>
	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
	99	down(&dvb->lock);
	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:
	113	up(&dvb->lock);
	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
	123	down(&dvb->lock);
	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	}
130	up(&dvb->lock);
131	return err;
132	}
133
134	/* ------------------------------------------------------------------ */
135
136	int videobuf_dvb_register(struct videobuf_dvb *dvb,
137	struct module *module,
138	void *adapter_priv)
139	{
140	int result;
141
142	init_MUTEX(&dvb->lock);
143
144	/* register adapter */
145	result = dvb_register_adapter(&dvb->adapter, dvb->name, module);
146	if (result < 0) {
147	printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
148	dvb->name, result);
149	goto fail_adapter;
150	}
fdc53a6d	151	dvb->adapter.priv = adapter_priv;
1da177e4 LT	152
1da177e4 LT	153	/* register frontend */
fdc53a6d	154	result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
1da177e4 LT	155	if (result < 0) {
	156	printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
	157	dvb->name, result);
	158	goto fail_frontend;
	159	}
	160
	161	/* register demux stuff */
	162	dvb->demux.dmx.capabilities =
	163	DMX_TS_FILTERING \| DMX_SECTION_FILTERING \|
	164	DMX_MEMORY_BASED_FILTERING;
	165	dvb->demux.priv = dvb;
	166	dvb->demux.filternum = 256;
	167	dvb->demux.feednum = 256;
	168	dvb->demux.start_feed = videobuf_dvb_start_feed;
	169	dvb->demux.stop_feed = videobuf_dvb_stop_feed;
	170	result = dvb_dmx_init(&dvb->demux);
	171	if (result < 0) {
	172	printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
	173	dvb->name, result);
	174	goto fail_dmx;
	175	}
	176
	177	dvb->dmxdev.filternum = 256;
	178	dvb->dmxdev.demux = &dvb->demux.dmx;
	179	dvb->dmxdev.capabilities = 0;
fdc53a6d	180	result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
1da177e4 LT	181	if (result < 0) {
	182	printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
	183	dvb->name, result);
	184	goto fail_dmxdev;
	185	}
	186
	187	dvb->fe_hw.source = DMX_FRONTEND_0;
	188	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	189	if (result < 0) {
	190	printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
	191	dvb->name, result);
	192	goto fail_fe_hw;
	193	}
	194
	195	dvb->fe_mem.source = DMX_MEMORY_FE;
	196	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	197	if (result < 0) {
	198	printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
	199	dvb->name, result);
	200	goto fail_fe_mem;
	201	}
	202
	203	result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	204	if (result < 0) {
	205	printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
	206	dvb->name, result);
	207	goto fail_fe_conn;
	208	}
	209
	210	/* register network adapter */
fdc53a6d	211	dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
1da177e4 LT	212	return 0;
	213
	214	fail_fe_conn:
	215	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	216	fail_fe_mem:
	217	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	218	fail_fe_hw:
	219	dvb_dmxdev_release(&dvb->dmxdev);
	220	fail_dmxdev:
	221	dvb_dmx_release(&dvb->demux);
	222	fail_dmx:
	223	dvb_unregister_frontend(dvb->frontend);
	224	fail_frontend:
fdc53a6d	225	dvb_unregister_adapter(&dvb->adapter);
1da177e4 LT	226	fail_adapter:
	227	return result;
	228	}
	229
	230	void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
	231	{
	232	dvb_net_release(&dvb->net);
	233	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	234	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	235	dvb_dmxdev_release(&dvb->dmxdev);
	236	dvb_dmx_release(&dvb->demux);
	237	dvb_unregister_frontend(dvb->frontend);
fdc53a6d	238	dvb_unregister_adapter(&dvb->adapter);
1da177e4 LT	239	}
	240
	241	EXPORT_SYMBOL(videobuf_dvb_register);
	242	EXPORT_SYMBOL(videobuf_dvb_unregister);
	243
	244	/* ------------------------------------------------------------------ */
	245	/*
	246	* Local variables:
	247	* c-basic-offset: 8
	248	* compile-command: "make DVB=1"
	249	* End:
	250	*/
674434c6	251