/**
* ir_lirc_decode() - Send raw IR data to lirc_dev to be relayed to the
* lircd userspace daemon for decoding.
* @input_dev: the struct rc_dev descriptor of the device
* @duration: the struct ir_raw_event descriptor of the pulse/space
*
* This function returns -EINVAL if the lirc interfaces aren't wired up.
*/
static int ir_lirc_decode(struct rc_dev *dev, struct ir_raw_event ev)
{
struct lirc_codec *lirc = &dev->raw->lirc;
int sample;
if (!(dev->raw->enabled_protocols & RC_BIT_LIRC))
return 0;
if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf)
return -EINVAL;
/* Packet start */
if (ev.reset)
return 0;
/* Carrier reports */
if (ev.carrier_report) {
sample = LIRC_FREQUENCY(ev.carrier);
IR_dprintk(2, "carrier report (freq: %d)\n", sample);
/* Packet end */
} else if (ev.timeout) {
if (lirc->gap)
return 0;
lirc->gap_start = ktime_get();
lirc->gap = true;
lirc->gap_duration = ev.duration;
if (!lirc->send_timeout_reports)
return 0;
sample = LIRC_TIMEOUT(ev.duration / 1000);
IR_dprintk(2, "timeout report (duration: %d)\n", sample);
/* Normal sample */
} else {
if (lirc->gap) {
int gap_sample;
lirc->gap_duration += ktime_to_ns(ktime_sub(ktime_get(),
lirc->gap_start));
/* Convert to ms and cap by LIRC_VALUE_MASK */
do_div(lirc->gap_duration, 1000);
lirc->gap_duration = min(lirc->gap_duration,
(u64)LIRC_VALUE_MASK);
gap_sample = LIRC_SPACE(lirc->gap_duration);
lirc_buffer_write(dev->raw->lirc.drv->rbuf,
(unsigned char *) &gap_sample);
lirc->gap = false;
}
sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) :
LIRC_SPACE(ev.duration / 1000);
IR_dprintk(2, "delivering %uus %s to lirc_dev\n",
TO_US(ev.duration), TO_STR(ev.pulse));
}
lirc_buffer_write(dev->raw->lirc.drv->rbuf,
(unsigned char *) &sample);
wake_up(&dev->raw->lirc.drv->rbuf->wait_poll);
return 0;
}
//This process reads data from the device and forwards to the hw pipe
//as PULSE/SPACE data
int child_process(int pipe_w,int oldprotocol)
{
alarm(0);
signal(SIGTERM, SIG_DFL);
signal(SIGPIPE, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGHUP, SIG_IGN);
signal(SIGALRM, SIG_IGN);
unsigned char tirabuffer[64];
int tirabuflen = 0;
int readsize,tmp;
lirc_t data,tdata;
fd_set read_set;
struct timeval tv,trailtime,currtime;
unsigned long eusec;
tv.tv_sec = 0; tv.tv_usec=1000;
FD_ZERO(&read_set);
trailtime.tv_sec = 0;
trailtime.tv_usec = 0;
while (1)
{
FD_SET(hw.fd, &read_set);
tmp = select(hw.fd+1, &read_set, NULL, NULL, &tv);
if (tmp == 0) continue;
if (tmp < 0)
{
logprintf(LOG_ERR,"Error select()");
return 0;
}
if (!FD_ISSET(hw.fd, &read_set)) continue;
readsize = read(hw.fd, &tirabuffer[tirabuflen],
sizeof(tirabuffer)-tirabuflen);
if (readsize <= 0)
{
logprintf(LOG_ERR, "Error reading from Tira");
logperror(LOG_ERR, NULL);
return 0;
}
if (readsize == 0) continue;
tirabuflen += readsize;
tmp = 0;
while (tmp < tirabuflen-1)
{
data = tirabuffer[tmp];data<<=8;data += tirabuffer[tmp+1];
if (!oldprotocol) data <<= 3;else data<<=5;
if (data == 0)
{
if (tmp > tirabuflen-4) break; //we have to receive more data
if (tirabuffer[tmp+3] != 0xB2)
{
logprintf(LOG_ERR,"Tira error 00 00 xx B2 trailing : missing 0xB2");
return 0;
}
if ((trailtime.tv_sec == 0) && (trailtime.tv_usec == 0)) gettimeofday (&trailtime, NULL);
if (tmp > tirabuflen-6) break; //we have to receive more data
tmp += 4;
continue;
}
tmp += 2;
if ((trailtime.tv_sec != 0) || (trailtime.tv_usec != 0))
{
gettimeofday (&currtime, NULL);
if (trailtime.tv_usec > currtime.tv_usec) {
currtime.tv_usec += 1000000;
currtime.tv_sec--;
}
eusec = time_elapsed(&trailtime, &currtime);
if(eusec > LIRC_VALUE_MASK)
eusec = LIRC_VALUE_MASK;
trailtime.tv_sec = 0;
trailtime.tv_usec = 0;
if (eusec > data)
{
pulse_space = 1;
tdata = LIRC_SPACE(eusec);
if (write(pipe_w, &tdata, sizeof(tdata)) != sizeof(tdata))
{
logprintf(LOG_ERR,"Error writing pipe");
return 0;
}
}
}
data = pulse_space ? LIRC_PULSE(data):LIRC_SPACE(data);
pulse_space = 1-pulse_space;
if (write(pipe_w, &data, sizeof(data)) != sizeof(data))
{
logprintf(LOG_ERR,"Error writing pipe");
return 0;
}
}
//Scroll buffer to next position
if (tmp > 0)
{
memmove(tirabuffer, tirabuffer+tmp, tirabuflen-tmp);
tirabuflen -= tmp;
}
}
}
