kernel-ark/drivers/media/video/video-buf-dvb.c
Andrew de Quincey d09dbf92ad V4L/DVB (3762): Add sysfs device links to dvb devices
Currently in /sys/class/dvb/dvbX.demuxY/ we have:
	dev
	uevent
With the patch, we have (for a PCI DVB device):
	dev
	device -> ../../../devices/pci0000:00/0000:00:1e.0/0000:03:0d.0
	uevent
So userspace tools can (finally) work out which physical device a DVB adapter
refers to. Previously you had to kinda look through dmesg and hope that it
hadn't been dumped out of the buffer. This makes debugging a lot easier if
the system has been up for a long time!
This is done by adding an extra 'struct device *' parameter to
dvb_register_adapter(). It will work with any kind of standard
linux 'device'. Additionally, if someone has an embedded system which does
things differently, they can simply supply 'NULL' and the behaviour will be
as before - the link will simply not appear.

Ack'd-by: Manu Abraham <manu@linuxtv.org>
Acked-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2006-06-25 01:57:55 -03:00

253 lines
6.5 KiB
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;
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_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:
*/