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CoolPi-Armbian-Rockchip-RK3.../drivers/media/pci/ngene/ngene-dvb.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* ngene-dvb.c: nGene PCIe bridge driver - DVB functions
*
* Copyright (C) 2005-2007 Micronas
*
* Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
* Modifications for new nGene firmware,
* support for EEPROM-copying,
* support for new dual DVB-S2 card prototype
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/io.h>
#include <asm/div64.h>
#include <linux/pci.h>
#include <linux/timer.h>
#include <linux/byteorder/generic.h>
#include <linux/firmware.h>
#include <linux/vmalloc.h>
#include "ngene.h"
static int ci_tsfix = 1;
module_param(ci_tsfix, int, 0444);
MODULE_PARM_DESC(ci_tsfix, "Detect and fix TS buffer offset shifts in conjunction with CI expansions (default: 1/enabled)");
/****************************************************************************/
/* COMMAND API interface ****************************************************/
/****************************************************************************/
static ssize_t ts_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct dvb_device *dvbdev = file->private_data;
struct ngene_channel *chan = dvbdev->priv;
struct ngene *dev = chan->dev;
if (wait_event_interruptible(dev->tsout_rbuf.queue,
dvb_ringbuffer_free
(&dev->tsout_rbuf) >= count) < 0)
return 0;
dvb_ringbuffer_write_user(&dev->tsout_rbuf, buf, count);
return count;
}
static ssize_t ts_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct dvb_device *dvbdev = file->private_data;
struct ngene_channel *chan = dvbdev->priv;
struct ngene *dev = chan->dev;
int left, avail;
left = count;
while (left) {
if (wait_event_interruptible(
dev->tsin_rbuf.queue,
dvb_ringbuffer_avail(&dev->tsin_rbuf) > 0) < 0)
return -EAGAIN;
avail = dvb_ringbuffer_avail(&dev->tsin_rbuf);
if (avail > left)
avail = left;
dvb_ringbuffer_read_user(&dev->tsin_rbuf, buf, avail);
left -= avail;
buf += avail;
}
return count;
}
static __poll_t ts_poll(struct file *file, poll_table *wait)
{
struct dvb_device *dvbdev = file->private_data;
struct ngene_channel *chan = dvbdev->priv;
struct ngene *dev = chan->dev;
struct dvb_ringbuffer *rbuf = &dev->tsin_rbuf;
struct dvb_ringbuffer *wbuf = &dev->tsout_rbuf;
__poll_t mask = 0;
poll_wait(file, &rbuf->queue, wait);
poll_wait(file, &wbuf->queue, wait);
if (!dvb_ringbuffer_empty(rbuf))
mask |= EPOLLIN | EPOLLRDNORM;
if (dvb_ringbuffer_free(wbuf) >= 188)
mask |= EPOLLOUT | EPOLLWRNORM;
return mask;
}
static const struct file_operations ci_fops = {
.owner = THIS_MODULE,
.read = ts_read,
.write = ts_write,
.open = dvb_generic_open,
.release = dvb_generic_release,
.poll = ts_poll,
.mmap = NULL,
};
struct dvb_device ngene_dvbdev_ci = {
.priv = NULL,
.readers = 1,
.writers = 1,
.users = 2,
.fops = &ci_fops,
};
/****************************************************************************/
/* DVB functions and API interface ******************************************/
/****************************************************************************/
static void swap_buffer(u32 *p, u32 len)
{
while (len) {
*p = swab32(*p);
p++;
len -= 4;
}
}
/* start of filler packet */
static u8 fill_ts[] = { 0x47, 0x1f, 0xff, 0x10, TS_FILLER };
static int tsin_find_offset(void *buf, u32 len)
{
int i, l;
l = len - sizeof(fill_ts);
if (l <= 0)
return -1;
for (i = 0; i < l; i++) {
if (((char *)buf)[i] == 0x47) {
if (!memcmp(buf + i, fill_ts, sizeof(fill_ts)))
return i % 188;
}
}
return -1;
}
static inline void tsin_copy_stripped(struct ngene *dev, void *buf)
{
if (memcmp(buf, fill_ts, sizeof(fill_ts)) != 0) {
if (dvb_ringbuffer_free(&dev->tsin_rbuf) >= 188) {
dvb_ringbuffer_write(&dev->tsin_rbuf, buf, 188);
wake_up(&dev->tsin_rbuf.queue);
}
}
}
void *tsin_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
{
struct ngene_channel *chan = priv;
struct ngene *dev = chan->dev;
int tsoff;
if (flags & DF_SWAP32)
swap_buffer(buf, len);
if (dev->ci.en && chan->number == 2) {
/* blindly copy buffers if ci_tsfix is disabled */
if (!ci_tsfix) {
while (len >= 188) {
tsin_copy_stripped(dev, buf);
buf += 188;
len -= 188;
}
return NULL;
}
/* ci_tsfix = 1 */
/*
* since the remainder of the TS packet which got cut off
* in the previous tsin_exchange() run is at the beginning
* of the new TS buffer, append this to the temp buffer and
* send it to the DVB ringbuffer afterwards.
*/
if (chan->tsin_offset) {
memcpy(&chan->tsin_buffer[(188 - chan->tsin_offset)],
buf, chan->tsin_offset);
tsin_copy_stripped(dev, &chan->tsin_buffer);
buf += chan->tsin_offset;
len -= chan->tsin_offset;
}
/*
* copy TS packets to the DVB ringbuffer and detect new offset
* shifts by checking for a valid TS SYNC byte
*/
while (len >= 188) {
if (*((char *)buf) != 0x47) {
/*
* no SYNC header, find new offset shift
* (max. 188 bytes, tsoff will be mod 188)
*/
tsoff = tsin_find_offset(buf, len);
if (tsoff > 0) {
chan->tsin_offset += tsoff;
chan->tsin_offset %= 188;
buf += tsoff;
len -= tsoff;
dev_info(&dev->pci_dev->dev,
"%s(): tsin_offset shift by %d on channel %d\n",
__func__, tsoff,
chan->number);
/*
* offset corrected. re-check remaining
* len for a full TS frame, break and
* skip to fragment handling if < 188.
*/
if (len < 188)
break;
}
}
tsin_copy_stripped(dev, buf);
buf += 188;
len -= 188;
}
/*
* if a fragment is left, copy to temp buffer. The remainder
* will be appended in the next tsin_exchange() iteration.
*/
if (len > 0 && len < 188)
memcpy(&chan->tsin_buffer, buf, len);
return NULL;
}
if (chan->users > 0)
dvb_dmx_swfilter(&chan->demux, buf, len);
return NULL;
}
void *tsout_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
{
struct ngene_channel *chan = priv;
struct ngene *dev = chan->dev;
u32 alen;
alen = dvb_ringbuffer_avail(&dev->tsout_rbuf);
alen -= alen % 188;
if (alen < len)
FillTSBuffer(buf + alen, len - alen, flags);
else
alen = len;
dvb_ringbuffer_read(&dev->tsout_rbuf, buf, alen);
if (flags & DF_SWAP32)
swap_buffer((u32 *)buf, alen);
wake_up_interruptible(&dev->tsout_rbuf.queue);
return buf;
}
int ngene_start_feed(struct dvb_demux_feed *dvbdmxfeed)
{
struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
struct ngene_channel *chan = dvbdmx->priv;
if (chan->users == 0) {
if (!chan->dev->cmd_timeout_workaround || !chan->running)
set_transfer(chan, 1);
}
return ++chan->users;
}
int ngene_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
{
struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
struct ngene_channel *chan = dvbdmx->priv;
if (--chan->users)
return chan->users;
if (!chan->dev->cmd_timeout_workaround)
set_transfer(chan, 0);
return 0;
}
int my_dvb_dmx_ts_card_init(struct dvb_demux *dvbdemux, char *id,
int (*start_feed)(struct dvb_demux_feed *),
int (*stop_feed)(struct dvb_demux_feed *),
void *priv)
{
dvbdemux->priv = priv;
dvbdemux->filternum = 256;
dvbdemux->feednum = 256;
dvbdemux->start_feed = start_feed;
dvbdemux->stop_feed = stop_feed;
dvbdemux->write_to_decoder = NULL;
dvbdemux->dmx.capabilities = (DMX_TS_FILTERING |
DMX_SECTION_FILTERING |
DMX_MEMORY_BASED_FILTERING);
return dvb_dmx_init(dvbdemux);
}
int my_dvb_dmxdev_ts_card_init(struct dmxdev *dmxdev,
struct dvb_demux *dvbdemux,
struct dmx_frontend *hw_frontend,
struct dmx_frontend *mem_frontend,
struct dvb_adapter *dvb_adapter)
{
int ret;
dmxdev->filternum = 256;
dmxdev->demux = &dvbdemux->dmx;
dmxdev->capabilities = 0;
ret = dvb_dmxdev_init(dmxdev, dvb_adapter);
if (ret < 0)
return ret;
hw_frontend->source = DMX_FRONTEND_0;
dvbdemux->dmx.add_frontend(&dvbdemux->dmx, hw_frontend);
mem_frontend->source = DMX_MEMORY_FE;
dvbdemux->dmx.add_frontend(&dvbdemux->dmx, mem_frontend);
return dvbdemux->dmx.connect_frontend(&dvbdemux->dmx, hw_frontend);
}
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