![Hans Verkuil](/assets/img/avatar_default.png)
Ths function returns the virtual kernel address of the buffer and has nothing to do with allocation. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
404 lines
10 KiB
C
404 lines
10 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/slab.h>
|
|
|
|
#include <linux/freezer.h>
|
|
|
|
#include <media/videobuf-core.h>
|
|
#include <media/videobuf-dvb.h>
|
|
|
|
/* ------------------------------------------------------------------ */
|
|
|
|
MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static unsigned int debug;
|
|
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;
|
|
void *outp;
|
|
|
|
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 */
|
|
outp = videobuf_queue_to_vaddr(&dvb->dvbq, buf);
|
|
|
|
if (buf->state == VIDEOBUF_DONE)
|
|
dvb_dmx_swfilter(&dvb->demux, outp,
|
|
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) {
|
|
err = kthread_stop(dvb->thread);
|
|
dvb->thread = NULL;
|
|
}
|
|
mutex_unlock(&dvb->lock);
|
|
return err;
|
|
}
|
|
|
|
static int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *fe,
|
|
struct module *module,
|
|
void *adapter_priv,
|
|
struct device *device,
|
|
char *adapter_name,
|
|
short *adapter_nr,
|
|
int mfe_shared,
|
|
int (*fe_ioctl_override)(struct dvb_frontend *,
|
|
unsigned int, void *, unsigned int))
|
|
{
|
|
int result;
|
|
|
|
mutex_init(&fe->lock);
|
|
|
|
/* register adapter */
|
|
result = dvb_register_adapter(&fe->adapter, adapter_name, module,
|
|
device, adapter_nr);
|
|
if (result < 0) {
|
|
printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
|
|
adapter_name, result);
|
|
}
|
|
fe->adapter.priv = adapter_priv;
|
|
fe->adapter.mfe_shared = mfe_shared;
|
|
fe->adapter.fe_ioctl_override = fe_ioctl_override;
|
|
|
|
return result;
|
|
}
|
|
|
|
static int videobuf_dvb_register_frontend(struct dvb_adapter *adapter,
|
|
struct videobuf_dvb *dvb)
|
|
{
|
|
int result;
|
|
|
|
/* register frontend */
|
|
result = dvb_register_frontend(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, 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(adapter, &dvb->net, &dvb->demux.dmx);
|
|
if (dvb->net.dvbdev == NULL) {
|
|
result = -ENOMEM;
|
|
goto fail_fe_conn;
|
|
}
|
|
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->frontend = NULL;
|
|
|
|
return result;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------ */
|
|
/* Register a single adapter and one or more frontends */
|
|
int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
|
|
struct module *module,
|
|
void *adapter_priv,
|
|
struct device *device,
|
|
short *adapter_nr,
|
|
int mfe_shared,
|
|
int (*fe_ioctl_override)(struct dvb_frontend *,
|
|
unsigned int, void *, unsigned int))
|
|
{
|
|
struct list_head *list, *q;
|
|
struct videobuf_dvb_frontend *fe;
|
|
int res;
|
|
|
|
fe = videobuf_dvb_get_frontend(f, 1);
|
|
if (!fe) {
|
|
printk(KERN_WARNING "Unable to register the adapter which has no frontends\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Bring up the adapter */
|
|
res = videobuf_dvb_register_adapter(f, module, adapter_priv, device,
|
|
fe->dvb.name, adapter_nr, mfe_shared, fe_ioctl_override);
|
|
if (res < 0) {
|
|
printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
|
|
return res;
|
|
}
|
|
|
|
/* Attach all of the frontends to the adapter */
|
|
mutex_lock(&f->lock);
|
|
list_for_each_safe(list, q, &f->felist) {
|
|
fe = list_entry(list, struct videobuf_dvb_frontend, felist);
|
|
res = videobuf_dvb_register_frontend(&f->adapter, &fe->dvb);
|
|
if (res < 0) {
|
|
printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n",
|
|
fe->dvb.name, res);
|
|
goto err;
|
|
}
|
|
}
|
|
mutex_unlock(&f->lock);
|
|
return 0;
|
|
|
|
err:
|
|
mutex_unlock(&f->lock);
|
|
videobuf_dvb_unregister_bus(f);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(videobuf_dvb_register_bus);
|
|
|
|
void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
|
|
{
|
|
videobuf_dvb_dealloc_frontends(f);
|
|
|
|
dvb_unregister_adapter(&f->adapter);
|
|
}
|
|
EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
|
|
|
|
struct videobuf_dvb_frontend *videobuf_dvb_get_frontend(
|
|
struct videobuf_dvb_frontends *f, int id)
|
|
{
|
|
struct list_head *list, *q;
|
|
struct videobuf_dvb_frontend *fe, *ret = NULL;
|
|
|
|
mutex_lock(&f->lock);
|
|
|
|
list_for_each_safe(list, q, &f->felist) {
|
|
fe = list_entry(list, struct videobuf_dvb_frontend, felist);
|
|
if (fe->id == id) {
|
|
ret = fe;
|
|
break;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&f->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(videobuf_dvb_get_frontend);
|
|
|
|
int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f,
|
|
struct dvb_frontend *p)
|
|
{
|
|
struct list_head *list, *q;
|
|
struct videobuf_dvb_frontend *fe = NULL;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&f->lock);
|
|
|
|
list_for_each_safe(list, q, &f->felist) {
|
|
fe = list_entry(list, struct videobuf_dvb_frontend, felist);
|
|
if (fe->dvb.frontend == p) {
|
|
ret = fe->id;
|
|
break;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&f->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(videobuf_dvb_find_frontend);
|
|
|
|
struct videobuf_dvb_frontend *videobuf_dvb_alloc_frontend(
|
|
struct videobuf_dvb_frontends *f, int id)
|
|
{
|
|
struct videobuf_dvb_frontend *fe;
|
|
|
|
fe = kzalloc(sizeof(struct videobuf_dvb_frontend), GFP_KERNEL);
|
|
if (fe == NULL)
|
|
goto fail_alloc;
|
|
|
|
fe->id = id;
|
|
mutex_init(&fe->dvb.lock);
|
|
|
|
mutex_lock(&f->lock);
|
|
list_add_tail(&fe->felist, &f->felist);
|
|
mutex_unlock(&f->lock);
|
|
|
|
fail_alloc:
|
|
return fe;
|
|
}
|
|
EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
|
|
|
|
void videobuf_dvb_dealloc_frontends(struct videobuf_dvb_frontends *f)
|
|
{
|
|
struct list_head *list, *q;
|
|
struct videobuf_dvb_frontend *fe;
|
|
|
|
mutex_lock(&f->lock);
|
|
list_for_each_safe(list, q, &f->felist) {
|
|
fe = list_entry(list, struct videobuf_dvb_frontend, felist);
|
|
if (fe->dvb.net.dvbdev) {
|
|
dvb_net_release(&fe->dvb.net);
|
|
fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
|
|
&fe->dvb.fe_mem);
|
|
fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
|
|
&fe->dvb.fe_hw);
|
|
dvb_dmxdev_release(&fe->dvb.dmxdev);
|
|
dvb_dmx_release(&fe->dvb.demux);
|
|
dvb_unregister_frontend(fe->dvb.frontend);
|
|
}
|
|
if (fe->dvb.frontend)
|
|
/* always allocated, may have been reset */
|
|
dvb_frontend_detach(fe->dvb.frontend);
|
|
list_del(list); /* remove list entry */
|
|
kfree(fe); /* free frontend allocation */
|
|
}
|
|
mutex_unlock(&f->lock);
|
|
}
|
|
EXPORT_SYMBOL(videobuf_dvb_dealloc_frontends);
|