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/*
*
* 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/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;
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 == STATE_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)
{
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:
*/
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