[mirror_ubuntu-artful-kernel.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");
	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);
		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");
83144186	50	set_freezable();
1da177e4 LT	51	videobuf_read_start(&dvb->dvbq);
	52
	53	for (;;) {
	54	/* fetch next buffer */
	55	buf = list_entry(dvb->dvbq.stream.next,
	56	struct videobuf_buffer, stream);
	57	list_del(&buf->stream);
	58	err = videobuf_waiton(buf,0,1);
	59	BUG_ON(0 != err);
	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
	68	/* feed buffer data to demux */
	69	if (buf->state == STATE_DONE)
	70	dvb_dmx_swfilter(&dvb->demux, buf->dma.vmalloc,
	71	buf->size);
	72
	73	/* requeue buffer */
	74	list_add_tail(&buf->stream,&dvb->dvbq.stream);
	75	spin_lock_irqsave(dvb->dvbq.irqlock,flags);
	76	dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
	77	spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
	78	}
	79
	80	videobuf_read_stop(&dvb->dvbq);
	81	dprintk("dvb thread stopped\n");
	82
	83	/* Hmm, linux becomes very unhappy without this ... */
	84	while (!kthread_should_stop()) {
	85	set_current_state(TASK_INTERRUPTIBLE);
	86	schedule();
	87	}
	88	return 0;
	89	}
	90
	91	static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
	92	{
	93	struct dvb_demux *demux = feed->demux;
	94	struct videobuf_dvb *dvb = demux->priv;
	95	int rc;
	96
	97	if (!demux->dmx.frontend)
	98	return -EINVAL;
	99
3593cab5	100	mutex_lock(&dvb->lock);
1da177e4 LT	101	dvb->nfeeds++;
	102	rc = dvb->nfeeds;
	103
	104	if (NULL != dvb->thread)
	105	goto out;
	106	dvb->thread = kthread_run(videobuf_dvb_thread,
	107	dvb, "%s dvb", dvb->name);
	108	if (IS_ERR(dvb->thread)) {
	109	rc = PTR_ERR(dvb->thread);
	110	dvb->thread = NULL;
	111	}
	112
	113	out:
3593cab5	114	mutex_unlock(&dvb->lock);
1da177e4 LT	115	return rc;
	116	}
	117
	118	static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
	119	{
	120	struct dvb_demux *demux = feed->demux;
	121	struct videobuf_dvb *dvb = demux->priv;
	122	int err = 0;
	123
3593cab5	124	mutex_lock(&dvb->lock);
1da177e4 LT	125	dvb->nfeeds--;
	126	if (0 == dvb->nfeeds && NULL != dvb->thread) {
	127	// FIXME: cx8802_cancel_buffers(dev);
	128	err = kthread_stop(dvb->thread);
	129	dvb->thread = NULL;
	130	}
3593cab5	131	mutex_unlock(&dvb->lock);
1da177e4 LT	132	return err;
	133	}
	134
	135	/* ------------------------------------------------------------------ */
	136
	137	int videobuf_dvb_register(struct videobuf_dvb *dvb,
	138	struct module *module,
d09dbf92 AQ	139	void *adapter_priv,
d09dbf92 AQ	140	struct device *device)
1da177e4 LT	141	{
	142	int result;
	143
3593cab5	144	mutex_init(&dvb->lock);
1da177e4 LT	145
1da177e4 LT	146	/* register adapter */
d09dbf92	147	result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device);
1da177e4 LT	148	if (result < 0) {
	149	printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
	150	dvb->name, result);
	151	goto fail_adapter;
	152	}
fdc53a6d	153	dvb->adapter.priv = adapter_priv;
1da177e4 LT	154
1da177e4 LT	155	/* register frontend */
fdc53a6d	156	result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
1da177e4 LT	157	if (result < 0) {
	158	printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
	159	dvb->name, result);
	160	goto fail_frontend;
	161	}
	162
	163	/* register demux stuff */
	164	dvb->demux.dmx.capabilities =
	165	DMX_TS_FILTERING \| DMX_SECTION_FILTERING \|
	166	DMX_MEMORY_BASED_FILTERING;
	167	dvb->demux.priv = dvb;
	168	dvb->demux.filternum = 256;
	169	dvb->demux.feednum = 256;
	170	dvb->demux.start_feed = videobuf_dvb_start_feed;
	171	dvb->demux.stop_feed = videobuf_dvb_stop_feed;
	172	result = dvb_dmx_init(&dvb->demux);
	173	if (result < 0) {
	174	printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
	175	dvb->name, result);
	176	goto fail_dmx;
	177	}
	178
	179	dvb->dmxdev.filternum = 256;
	180	dvb->dmxdev.demux = &dvb->demux.dmx;
	181	dvb->dmxdev.capabilities = 0;
fdc53a6d	182	result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
1da177e4 LT	183	if (result < 0) {
	184	printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
	185	dvb->name, result);
	186	goto fail_dmxdev;
	187	}
	188
	189	dvb->fe_hw.source = DMX_FRONTEND_0;
	190	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	191	if (result < 0) {
	192	printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
	193	dvb->name, result);
	194	goto fail_fe_hw;
	195	}
	196
	197	dvb->fe_mem.source = DMX_MEMORY_FE;
	198	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	199	if (result < 0) {
	200	printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
	201	dvb->name, result);
	202	goto fail_fe_mem;
	203	}
	204
	205	result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	206	if (result < 0) {
	207	printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
	208	dvb->name, result);
	209	goto fail_fe_conn;
	210	}
	211
	212	/* register network adapter */
fdc53a6d	213	dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
1da177e4 LT	214	return 0;
	215
	216	fail_fe_conn:
	217	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	218	fail_fe_mem:
	219	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	220	fail_fe_hw:
	221	dvb_dmxdev_release(&dvb->dmxdev);
	222	fail_dmxdev:
	223	dvb_dmx_release(&dvb->demux);
	224	fail_dmx:
	225	dvb_unregister_frontend(dvb->frontend);
	226	fail_frontend:
f52a838b	227	dvb_frontend_detach(dvb->frontend);
fdc53a6d	228	dvb_unregister_adapter(&dvb->adapter);
1da177e4 LT	229	fail_adapter:
	230	return result;
	231	}
	232
	233	void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
	234	{
	235	dvb_net_release(&dvb->net);
	236	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
	237	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
	238	dvb_dmxdev_release(&dvb->dmxdev);
	239	dvb_dmx_release(&dvb->demux);
	240	dvb_unregister_frontend(dvb->frontend);
f52a838b	241	dvb_frontend_detach(dvb->frontend);
fdc53a6d	242	dvb_unregister_adapter(&dvb->adapter);
1da177e4 LT	243	}
	244
	245	EXPORT_SYMBOL(videobuf_dvb_register);
	246	EXPORT_SYMBOL(videobuf_dvb_unregister);
	247
	248	/* ------------------------------------------------------------------ */
	249	/*
	250	* Local variables:
	251	* c-basic-offset: 8
	252	* compile-command: "make DVB=1"
	253	* End:
	254	*/
674434c6	255