drivers/media/video/video-buf-dvb.c - maze/linux - Git at Google

 /*
  * $Id: video-buf-dvb.c,v 1.7 2004/12/09 12:51:35 kraxel Exp $
  *
  * 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;
 		if (current->flags & PF_FREEZE)
 			refrigerator(PF_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:
  */
	/*
	* $Id: video-buf-dvb.c,v 1.7 2004/12/09 12:51:35 kraxel Exp $
	*
	* 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;
	if (current->flags & PF_FREEZE)
	refrigerator(PF_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:
	*/