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/* $Id: lirc_serial.c,v 5.30 2001/09/14 20:39:14 lirc Exp $ */
/****************************************************************************
** lirc_serial.c ***********************************************************
****************************************************************************
*
* lirc_serial - Device driver that records pulse- and pause-lengths
* (space-lengths) between DDCD event on a serial port.
*
* Copyright (C) 1996,97 Ralph Metzler <rjkm@thp.uni-koeln.de>
* Copyright (C) 1998 Trent Piepho <xyzzy@u.washington.edu>
* Copyright (C) 1998 Ben Pfaff <blp@gnu.org>
* Copyright (C) 1999 Christoph Bartelmus <lirc@bartelmus.de>
*
*/
/* Steve's changes to improve transmission fidelity:
- for systems with the rdtsc instruction and the clock counter, a
send_pule that times the pulses directly using the counter.
This means that the LIRC_SERIAL_TRANSMITTER_LATENCY fudge is
not needed. Measurement shows very stable waveform, even where
PCI activity slows the access to the UART, which trips up other
versions.
- For other system, non-integer-microsecond pulse/space lengths,
done using fixed point binary. So, much more accurate carrier
frequency.
- fine tuned transmitter latency, taking advantage of fractional
microseconds in previous change
- Fixed bug in the way transmitter latency was accounted for by
tuning the pulse lengths down - the send_pulse routine ignored
this overhead as it timed the overall pulse length - so the
pulse frequency was right but overall pulse length was too
long. Fixed by accounting for latency on each pulse/space
iteration.
Steve Davies <steve@daviesfam.org> July 2001
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <linux/version.h>
#if LINUX_VERSION_CODE >= 0x020100
#define KERNEL_2_1
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0)
#define KERNEL_2_3
#endif
#endif
#include <linux/config.h>
#ifndef CONFIG_SERIAL_MODULE
#warning "******************************************"
#warning " Your serial port driver is compiled into "
#warning " the kernel. You will have to release the "
#warning " port you want to use for LIRC with: "
#warning " setserial /dev/ttySx uart none "
#warning "******************************************"
#endif
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/serial_reg.h>
#include <linux/time.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <linux/mm.h>
#include <linux/delay.h>
#ifdef KERNEL_2_1
#include <linux/poll.h>
#endif
#include <asm/system.h>
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/fcntl.h>
#include "drivers/lirc.h"
#if defined(rdtsc) && defined(KERNEL_2_1)
#define USE_RDTSC
#warning "Note: using rdtsc instruction"
#endif
#ifdef LIRC_SERIAL_ANIMAX
#ifdef LIRC_SERIAL_TRANSMITTER
#warning "******************************************"
#warning " This receiver does not have a "
#warning " transmitter diode "
#warning "******************************************"
#undef LIRC_SERIAL_TRANSMITTER
#endif
#endif
#if defined(LIRC_SERIAL_IRDEO) || defined(LIRC_SERIAL_IRDEO_REMOTE)
#define LIRC_SIGNAL_PIN UART_MSR_DSR
#define LIRC_SIGNAL_PIN_CHANGE UART_MSR_DDSR
#ifndef LIRC_SERIAL_TRANSMITTER
#define LIRC_SERIAL_TRANSMITTER
#endif
#ifndef LIRC_SERIAL_SOFTCARRIER
#define LIRC_SERIAL_SOFTCARRIER
#endif
#else
#define LIRC_SIGNAL_PIN UART_MSR_DCD
#define LIRC_SIGNAL_PIN_CHANGE UART_MSR_DDCD
#endif
#define LIRC_DRIVER_NAME "lirc_serial"
#define RS_ISR_PASS_LIMIT 256
/* A long pulse code from a remote might take upto 300 bytes. The
daemon should read the bytes as soon as they are generated, so take
the number of keys you think you can push before the daemon runs
and multiply by 300. The driver will warn you if you overrun this
buffer. If you have a slow computer or non-busmastering IDE disks,
maybe you will need to increase this. */
/* This MUST be a power of two! It has to be larger than 1 as well. */
#define RBUF_LEN 256
#define WBUF_LEN 256
static int major = LIRC_MAJOR;
static int sense = -1; /* -1 = auto, 0 = active high, 1 = active low */
#ifdef KERNEL_2_3
static DECLARE_WAIT_QUEUE_HEAD(lirc_wait_in);
#else
static struct wait_queue *lirc_wait_in = NULL;
#endif
#ifdef KERNEL_2_1
static spinlock_t lirc_lock = SPIN_LOCK_UNLOCKED;
#endif
static int port = LIRC_PORT;
static int irq = LIRC_IRQ;
static struct timeval lasttv = {0, 0};
static lirc_t rbuf[RBUF_LEN];
static int rbh, rbt;
#ifdef LIRC_SERIAL_TRANSMITTER
static lirc_t wbuf[WBUF_LEN];
unsigned int freq = 38000;
unsigned int duty_cycle = 50;
#ifdef USE_RDTSC
/* This version does sub-microsecond timing using rdtsc instruction,
* and does away with the fudged LIRC_SERIAL_TRANSMITTER_LATENCY
* Implicitly i586 architecture... - Steve
*/
/* When we use the rdtsc instruction to measure clocks, we keep the
* pulse and space widths as clock cycles. As this is CPU speed
* dependent, the widths must be calculated in init_port and ioctl
* time
*/
unsigned long period = 0;
unsigned long pulse_width = 0;
unsigned long space_width = 0;
/* So send_pulse can quickly convert microseconds to clocks */
unsigned long conv_us_to_clocks = 0;
#else /* USE_RDTSC */
/* Version using udelay() */
/* period, pulse/space width are kept with 8 binary places -
IE multiplied by 256. */
unsigned long period = 6736; /* 256*1000000L/freq; */
unsigned long pulse_width = 3368; /* (period*duty_cycle/100) */
unsigned long space_width = 3368; /* (period - pulse_width) */
#if defined(__i386__)
/*
From:
Linux I/O port programming mini-HOWTO
Author: Riku Saikkonen <Riku.Saikkonen@hut.fi>
v, 28 December 1997
[...]
Actually, a port I/O instruction on most ports in the 0-0x3ff range
takes almost exactly 1 microsecond, so if you're, for example, using
the parallel port directly, just do additional inb()s from that port
to delay.
[...]
*/
/* transmitter latency 1.5625us 0x1.90 - this figure arrived at from
* comment above plus trimming to match actual measured frequency.
* This will be sensitive to cpu speed, though hopefully most of the 1.5us
* is spent in the uart access. Still - for reference test machine was a
* 1.13GHz Athlon system - Steve
*/
/* changed from 400 to 450 as this works better on slower machines;
faster machines will use the rdtsc code anyway */
#define LIRC_SERIAL_TRANSMITTER_LATENCY 450
#else
/* does anybody have information on other platforms ? */
/* 256 = 1<<8 */
#define LIRC_SERIAL_TRANSMITTER_LATENCY 256
#endif /* __i386__ */
#endif /* USE_RDTSC */
#endif /* LIRC_SERIAL_TRANSMITTER */
#ifdef LIRC_SERIAL_ANIMAX
#define LIRC_OFF (UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2)
#elif defined(LIRC_SERIAL_IRDEO)
#define LIRC_OFF (UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2)
#define LIRC_ON UART_MCR_OUT2
#elif defined(LIRC_SERIAL_IRDEO_REMOTE)
#define LIRC_OFF (UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2)
#define LIRC_ON LIRC_OFF
#else
#define LIRC_OFF (UART_MCR_RTS|UART_MCR_OUT2)
#define LIRC_ON (LIRC_OFF|UART_MCR_DTR)
#endif
static inline unsigned int sinp(int offset)
{
return inb(port + offset);
}
static inline void soutp(int offset, int value)
{
outb(value, port + offset);
}
#ifdef LIRC_SERIAL_TRANSMITTER
void on(void)
{
soutp(UART_MCR,LIRC_ON);
}
void off(void)
{
soutp(UART_MCR,LIRC_OFF);
}
#if defined(LIRC_SERIAL_SOFTCARRIER) && defined(USE_RDTSC)
/* This is an overflow/precision juggle, complicated in that we can't
do long long divide in the kernel */
void calc_pulse_lengths_in_clocks(void)
{
unsigned long long loops_per_sec,work;
#ifdef KERNEL_2_3
loops_per_sec=current_cpu_data.loops_per_jiffy;
loops_per_sec*=HZ;
#else
loops_per_sec=current_cpu_data.loops_per_sec;
#endif
/* How many clocks in a microsecond?, avoiding long long divide */
work=loops_per_sec;
work*=4295; /* 4295 = 2^32 / 1e6 */
conv_us_to_clocks=(work>>32);
/* Carrier period in clocks, approach good up to 32GHz clock,
gets carrier frequency within 8Hz */
period=loops_per_sec>>3;
period/=(freq>>3);
/* Derive pulse and space from the period */
pulse_width = period*duty_cycle/100;
space_width = period - pulse_width;
#ifdef DEBUG
#ifdef KERNEL_2_3
printk(KERN_INFO LIRC_DRIVER_NAME
": in calc_pulse_lengths_in_clocks, freq=%d, duty_cycle=%d, "
"clk/jiffy=%ld, pulse=%ld, space=%ld, conv_us_to_clocks=%ld\n",
freq, duty_cycle, current_cpu_data.loops_per_jiffy,
pulse_width, space_width, conv_us_to_clocks);
#else
printk(KERN_INFO LIRC_DRIVER_NAME
": in calc_pulse_lengths_in_clocks, freq=%d, duty_cycle=%d, "
"clk/sec=%ld, pulse=%ld, space=%ld, conv_us_to_clocks=%ld\n",
freq, duty_cycle, current_cpu_data.loops_per_sec,
pulse_width, space_width, conv_us_to_clocks);
#endif
#endif
}
#endif
/* return value: space length delta */
long send_pulse(unsigned long length)
{
#if defined(LIRC_SERIAL_IRDEO) || defined(LIRC_SERIAL_IRDEO_REMOTE)
long rawbits;
int i;
unsigned char output;
unsigned char chunk,shifted;
/* how many bits have to be sent ? */
rawbits=length*1152/10000;
if(duty_cycle>50) chunk=3;
else chunk=1;
for(i=0,output=0x7f;rawbits>0;rawbits-=3)
{
shifted=chunk<<(i*3);
shifted>>=1;
output&=(~shifted);
i++;
if(i==3)
{
soutp(UART_TX,output);
while(!(sinp(UART_LSR) & UART_LSR_THRE));
output=0x7f;
i=0;
}
}
if(i!=0)
{
soutp(UART_TX,output);
while(!(sinp(UART_LSR) & UART_LSR_TEMT));
}
if(i==0)
{
return((-rawbits)*10000/1152);
}
else
{
return((3-i)*3*10000/1152+(-rawbits)*10000/1152);
}
#else
#ifdef LIRC_SERIAL_SOFTCARRIER
#ifdef USE_RDTSC
unsigned long target, start, now;
#else
unsigned long actual, target, d;
#endif
int flag;
#endif
if(length<=0) return 0;
#ifdef LIRC_SERIAL_SOFTCARRIER
#ifdef USE_RDTSC
/* Version that uses Pentium rdtsc instruction to measure clocks */
/* Get going quick as we can */
rdtscl(start);on();
/* Convert length from microseconds to clocks */
length*=conv_us_to_clocks;
/* And loop till time is up - flipping at right intervals */
now=start;
target=pulse_width;
flag=1;
while((now-start)<length)
{
/* Delay till flip time */
do
{
rdtscl(now);
}
while ((now-start)<target);
/* flip */
if(flag)
{
rdtscl(now);off();
target+=space_width;
}
else
{
rdtscl(now);on();
target+=pulse_width;
}
flag=!flag;
}
rdtscl(now);
return(((now-start)-length)/conv_us_to_clocks);
#else
/* here we use fixed point arithmetic, with 8 fractional bits.
that gets us within 0.1% or so of the right average frequency,
albeit with some jitter in pulse length - Steve */
/* To match 8 fractional bits used for pulse/space length */
length<<=8;
actual=target=0; flag=0;
while(actual<length)
{
if(flag)
{
off();
target+=space_width;
}
else
{
on();
target+=pulse_width;
}
d=(target-actual-LIRC_SERIAL_TRANSMITTER_LATENCY+128)>>8;
/* Note - we've checked in ioctl that the pulse/space
widths are big enough so that d is > 0 */
udelay(d);
actual+=(d<<8)+LIRC_SERIAL_TRANSMITTER_LATENCY;
flag=!flag;
}
return((actual-length)>>8);
#endif
#else /* SOFT_CARRIER */
on();
udelay(length);
return(0);
#endif
#endif
}
void send_space(long length)
{
# if !defined(LIRC_SERIAL_IRDEO) && !defined(LIRC_SERIAL_IRDEO_REMOTE)
off();
# endif
if(length<=0) return;
udelay(length);
}
#endif
static void inline rbwrite(lirc_t l)
{
unsigned int nrbt;
nrbt=(rbt+1) & (RBUF_LEN-1);
if(nrbt==rbh) /* no new signals will be accepted */
{
# ifdef DEBUG
printk(KERN_WARNING LIRC_DRIVER_NAME ": Buffer overrun\n");
# endif
return;
}
rbuf[rbt]=l;
rbt=nrbt;
}
static void inline frbwrite(lirc_t l)
{
/* simple noise filter */
static lirc_t pulse=0L,space=0L;
static unsigned int ptr=0;
if(ptr>0 && (l&PULSE_BIT))
{
pulse+=l&PULSE_MASK;
if(pulse>250)
{
rbwrite(space);
rbwrite(pulse|PULSE_BIT);
ptr=0;
pulse=0;
}
return;
}
if(!(l&PULSE_BIT))
{
if(ptr==0)
{
if(l>20000)
{
space=l;
ptr++;
return;
}
}
else
{
if(l>20000)
{
space+=pulse;
if(space>PULSE_MASK) space=PULSE_MASK;
space+=l;
if(space>PULSE_MASK) space=PULSE_MASK;
pulse=0;
return;
}
rbwrite(space);
rbwrite(pulse|PULSE_BIT);
ptr=0;
pulse=0;
}
}
rbwrite(l);
}
void irq_handler(int i, void *blah, struct pt_regs *regs)
{
struct timeval tv;
int status,counter,dcd;
long deltv;
lirc_t data;
counter=0;
do{
counter++;
status=sinp(UART_MSR);
if(counter>RS_ISR_PASS_LIMIT)
{
printk(KERN_WARNING LIRC_DRIVER_NAME ": AIEEEE: "
"We're caught!\n");
break;
}
if((status&LIRC_SIGNAL_PIN_CHANGE) && sense!=-1)
{
/* get current time */
do_gettimeofday(&tv);
/* New mode, written by Trent Piepho
<xyzzy@u.washington.edu>. */
/* The old format was not very portable.
We now use the type lirc_t to pass pulses
and spaces to user space.
If PULSE_BIT is set a pulse has been
received, otherwise a space has been
received. The driver needs to know if your
receiver is active high or active low, or
the space/pulse sense could be
inverted. The bits denoted by PULSE_MASK are
the length in microseconds. Lengths greater
than or equal to 16 seconds are clamped to
PULSE_MASK. All other bits are unused.
This is a much simpler interface for user
programs, as well as eliminating "out of
phase" errors with space/pulse
autodetection. */
/* calculate time since last interrupt in
microseconds */
dcd=(status & LIRC_SIGNAL_PIN) ? 1:0;
deltv=tv.tv_sec-lasttv.tv_sec;
if(deltv>15)
{
#ifdef DEBUG
printk(KERN_WARNING LIRC_DRIVER_NAME
": AIEEEE: %d %d %lx %lx %lx %lx\n",
dcd,sense,
tv.tv_sec,lasttv.tv_sec,
tv.tv_usec,lasttv.tv_usec);
#endif
data=PULSE_MASK; /* really long time */
if(!(dcd^sense)) /* sanity check */
{
/* detecting pulse while this
MUST be a space! */
sense=sense ? 0:1;
}
}
else
{
data=(lirc_t) (deltv*1000000+
tv.tv_usec-
lasttv.tv_usec);
};
if(tv.tv_sec<lasttv.tv_sec ||
(tv.tv_sec==lasttv.tv_sec &&
tv.tv_usec<lasttv.tv_usec))
{
printk(KERN_WARNING LIRC_DRIVER_NAME
": AIEEEE: your clock just jumped "
"backwards\n");
printk(KERN_WARNING LIRC_DRIVER_NAME
"%d %d %lx %lx %lx %lx\n",
dcd,sense,
tv.tv_sec,lasttv.tv_sec,
tv.tv_usec,lasttv.tv_usec);
data=PULSE_MASK;
}
frbwrite(dcd^sense ? data : (data|PULSE_BIT));
lasttv=tv;
wake_up_interruptible(&lirc_wait_in);
}
} while(!(sinp(UART_IIR) & UART_IIR_NO_INT)); /* still pending ? */
}
#ifdef KERNEL_2_3
static DECLARE_WAIT_QUEUE_HEAD(power_supply_queue);
#else
static struct wait_queue *power_supply_queue = NULL;
#endif
#ifndef KERNEL_2_1
static struct timer_list power_supply_timer;
static void power_supply_up(unsigned long ignored)
{
wake_up(&power_supply_queue);
}
#endif
static int init_port(void)
{
unsigned long flags;
/* Check io region*/
if((check_region(port,8))==-EBUSY)
{
#if 0
/* this is the correct behaviour but many people have
the serial driver compiled into the kernel... */
printk(KERN_ERR LIRC_DRIVER_NAME
": port %04x already in use\n", port);
return(-EBUSY);
#else
printk(KERN_ERR LIRC_DRIVER_NAME
": port %04x already in use, proceding anyway\n", port);
printk(KERN_WARNING LIRC_DRIVER_NAME
": compile the serial port driver as module and\n");
printk(KERN_WARNING LIRC_DRIVER_NAME
": make sure this module is loaded first\n");
release_region(port,8);
#endif
}
/* Reserve io region. */
request_region(port, 8, LIRC_DRIVER_NAME);
save_flags(flags);cli();
/* Set DLAB 0. */
soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
/* First of all, disable all interrupts */
soutp(UART_IER, sinp(UART_IER)&
(~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
/* Clear registers. */
sinp(UART_LSR);
sinp(UART_RX);
sinp(UART_IIR);
sinp(UART_MSR);
/* Set line for power source */
soutp(UART_MCR, LIRC_OFF);
/* Clear registers again to be sure. */
sinp(UART_LSR);
sinp(UART_RX);
sinp(UART_IIR);
sinp(UART_MSR);
# if defined(LIRC_SERIAL_IRDEO) || defined(LIRC_SERIAL_IRDEO_REMOTE)
/* setup port to 7N1 @ 115200 Baud */
/* 7N1+start = 9 bits at 115200 ~ 3 bits at 38kHz */
/* Set DLAB 1. */
soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
/* Set divisor to 1 => 115200 Baud */
soutp(UART_DLM,0);
soutp(UART_DLL,1);
/* Set DLAB 0 + 7N1 */
soutp(UART_LCR,UART_LCR_WLEN7);
/* THR interrupt already disabled at this point */
# endif
restore_flags(flags);
#ifdef LIRC_SERIAL_TRANSMITTER
#ifdef USE_RDTSC
/* Initialize pulse/space widths */
calc_pulse_lengths_in_clocks();
#endif
#endif
/* If pin is high, then this must be an active low receiver. */
if(sense==-1)
{
/* wait 1 sec for the power supply */
# ifdef KERNEL_2_1
sleep_on_timeout(&power_supply_queue,HZ);
# else
init_timer(&power_supply_timer);
power_supply_timer.expires=jiffies+HZ;
power_supply_timer.data=(unsigned long) current;
power_supply_timer.function=power_supply_up;
add_timer(&power_supply_timer);
sleep_on(&power_supply_queue);
del_timer(&power_supply_timer);
# endif
sense=(sinp(UART_MSR) & LIRC_SIGNAL_PIN) ? 1:0;
printk(KERN_INFO LIRC_DRIVER_NAME ": auto-detected active "
"%s receiver\n",sense ? "low":"high");
}
else
{
printk(KERN_INFO LIRC_DRIVER_NAME ": Manually using active "
"%s receiver\n",sense ? "low":"high");
};
return 0;
}
static int lirc_open(struct inode *ino, struct file *filep)
{
int result;
unsigned long flags;
# ifdef KERNEL_2_1
spin_lock(&lirc_lock);
# endif
if(MOD_IN_USE)
{
# ifdef KERNEL_2_1
spin_unlock(&lirc_lock);
# endif
return -EBUSY;
}
/* initialize timestamp */
do_gettimeofday(&lasttv);
result=request_irq(irq,irq_handler,SA_INTERRUPT,LIRC_DRIVER_NAME,NULL);
switch(result)
{
case -EBUSY:
printk(KERN_ERR LIRC_DRIVER_NAME ": IRQ %d busy\n", irq);
# ifdef KERNEL_2_1
spin_unlock(&lirc_lock);
# endif
return -EBUSY;
case -EINVAL:
printk(KERN_ERR LIRC_DRIVER_NAME
": Bad irq number or handler\n");
# ifdef KERNEL_2_1
spin_unlock(&lirc_lock);
# endif
return -EINVAL;
default:
# ifdef DEBUG
printk(KERN_INFO LIRC_DRIVER_NAME
": Interrupt %d, port %04x obtained\n", irq, port);
# endif
break;
};
/* finally enable interrupts. */
save_flags(flags);cli();
/* Set DLAB 0. */
soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
restore_flags(flags);
/* Init read buffer pointers. */
rbh = rbt = 0;
MOD_INC_USE_COUNT;
# ifdef KERNEL_2_1
spin_unlock(&lirc_lock);
# endif
return 0;
}
#ifdef KERNEL_2_1
static int lirc_close(struct inode *node, struct file *file)
#else
static void lirc_close(struct inode *node, struct file *file)
#endif
{ unsigned long flags;
save_flags(flags);cli();
/* Set DLAB 0. */
soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
/* First of all, disable all interrupts */
soutp(UART_IER, sinp(UART_IER)&
(~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
restore_flags(flags);
free_irq(irq, NULL);
# ifdef DEBUG
printk(KERN_INFO LIRC_DRIVER_NAME ": freed IRQ %d\n", irq);
# endif
MOD_DEC_USE_COUNT;
#ifdef KERNEL_2_1
return 0;
#endif
}
#ifdef KERNEL_2_1
static unsigned int lirc_poll(struct file *file, poll_table * wait)
{
poll_wait(file, &lirc_wait_in, wait);
if (rbh != rbt)
return POLLIN | POLLRDNORM;
return 0;
}
#else
static int lirc_select(struct inode *node, struct file *file,
int sel_type, select_table * wait)
{
if (sel_type != SEL_IN)
return 0;
if (rbh != rbt)
return 1;
select_wait(&lirc_wait_in, wait);
return 0;
}
#endif
#ifdef KERNEL_2_1
static ssize_t lirc_read(struct file *file, char *buf,
size_t count, loff_t * ppos)
#else
static int lirc_read(struct inode *node, struct file *file, char *buf,
int count)
#endif
{
int n=0,retval=0;
#ifdef KERNEL_2_3
DECLARE_WAITQUEUE(wait,current);
#else
struct wait_queue wait={current,NULL};
#endif
if(n%sizeof(lirc_t)) return(-EINVAL);
add_wait_queue(&lirc_wait_in,&wait);
current->state=TASK_INTERRUPTIBLE;
while (n < count)
{
if (rbt != rbh) {
# ifdef KERNEL_2_1
copy_to_user((void *) buf+n,
(void *) &rbuf[rbh],sizeof(lirc_t));
# else
memcpy_tofs((void *) buf+n,
(void *) &rbuf[rbh],sizeof(lirc_t));
# endif
rbh = (rbh + 1) & (RBUF_LEN - 1);
n+=sizeof(lirc_t);
} else {
if (file->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
break;
}
# ifdef KERNEL_2_1
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
# else
if (current->signal & ~current->blocked) {
retval = -EINTR;
break;
}
# endif
schedule();
current->state=TASK_INTERRUPTIBLE;
}
}
remove_wait_queue(&lirc_wait_in,&wait);
current->state=TASK_RUNNING;
return (n ? n : retval);
}
#ifdef KERNEL_2_1
static ssize_t lirc_write(struct file *file, const char *buf,
size_t n, loff_t * ppos)
#else
static int lirc_write(struct inode *node, struct file *file, const char *buf,
int n)
#endif
{
#ifdef LIRC_SERIAL_TRANSMITTER
int retval,i,count;
unsigned long flags;
long delta=0;
if(n%sizeof(lirc_t)) return(-EINVAL);
retval=verify_area(VERIFY_READ,buf,n);
if(retval) return(retval);
count=n/sizeof(lirc_t);
if(count>WBUF_LEN || count%2==0) return(-EINVAL);
# ifdef KERNEL_2_1
copy_from_user(wbuf,buf,n);
# else
memcpy_fromfs(wbuf,buf,n);
# endif
save_flags(flags);cli();
# ifdef LIRC_SERIAL_IRDEO
/* DTR, RTS down */
on();
# endif
for(i=0;i<count;i++)
{
if(i%2) send_space(wbuf[i]-delta);
else delta=send_pulse(wbuf[i]);
}
off();
restore_flags(flags);
return(n);
#else
return(-EBADF);
#endif
}
static int lirc_ioctl(struct inode *node,struct file *filep,unsigned int cmd,
unsigned long arg)
{
int result;
unsigned long value;
unsigned int ivalue;
unsigned long features=
# ifdef LIRC_SERIAL_TRANSMITTER
# ifdef LIRC_SERIAL_SOFTCARRIER
LIRC_CAN_SET_SEND_DUTY_CYCLE|
# ifndef LIRC_SERIAL_IRDEO
LIRC_CAN_SET_SEND_CARRIER|
# endif
# endif
LIRC_CAN_SEND_PULSE|
# endif
# if defined(LIRC_SERIAL_IRDEO_REMOTE)
0;
# else
LIRC_CAN_REC_MODE2;
# endif
switch(cmd)
{
case LIRC_GET_FEATURES:
# ifdef KERNEL_2_1
result=put_user(features,(unsigned long *) arg);
if(result) return(result);
# else
result=verify_area(VERIFY_WRITE,(unsigned long*) arg,
sizeof(unsigned long));
if(result) return(result);
put_user(features,(unsigned long *) arg);
# endif
break;
# ifdef LIRC_SERIAL_TRANSMITTER
case LIRC_GET_SEND_MODE:
# ifdef KERNEL_2_1
result=put_user(LIRC_MODE_PULSE,(unsigned long *) arg);
if(result) return(result);
# else
result=verify_area(VERIFY_WRITE,(unsigned long *) arg,
sizeof(unsigned long));
if(result) return(result);
put_user(LIRC_MODE_PULSE,(unsigned long *) arg);
# endif
break;
# endif
case LIRC_GET_REC_MODE:
# ifdef KERNEL_2_1
result=put_user(LIRC_MODE_MODE2,(unsigned long *) arg);
if(result) return(result);
# else
result=verify_area(VERIFY_WRITE,(unsigned long *) arg,
sizeof(unsigned long));
if(result) return(result);
put_user(LIRC_MODE_MODE2,(unsigned long *) arg);
# endif
break;
# ifdef LIRC_SERIAL_TRANSMITTER
case LIRC_SET_SEND_MODE:
# ifdef KERNEL_2_1
result=get_user(value,(unsigned long *) arg);
if(result) return(result);
# else
result=verify_area(VERIFY_READ,(unsigned long *) arg,
sizeof(unsigned long));
if(result) return(result);
value=get_user((unsigned long *) arg);
# endif
if(value!=LIRC_MODE_PULSE) return(-ENOSYS);
break;
# endif
case LIRC_SET_REC_MODE:
# ifdef KERNEL_2_1
result=get_user(value,(unsigned long *) arg);
if(result) return(result);
# else
result=verify_area(VERIFY_READ,(unsigned long *) arg,
sizeof(unsigned long));
if(result) return(result);
value=get_user((unsigned long *) arg);
# endif
if(value!=LIRC_MODE_MODE2) return(-ENOSYS);
break;
# ifdef LIRC_SERIAL_TRANSMITTER
# ifdef LIRC_SERIAL_SOFTCARRIER
case LIRC_SET_SEND_DUTY_CYCLE:
# ifdef KERNEL_2_1
result=get_user(ivalue,(unsigned int *) arg);
if(result) return(result);
# else
result=verify_area(VERIFY_READ,(unsigned int *) arg,
sizeof(unsigned int));
if(result) return(result);
ivalue=get_user((unsigned int *) arg);
# endif
if(ivalue<=0 || ivalue>100) return(-EINVAL);
#ifdef USE_RDTSC
duty_cycle=ivalue;
calc_pulse_lengths_in_clocks();
#else
if(256*1000000L/freq*ivalue/100<=
LIRC_SERIAL_TRANSMITTER_LATENCY) return(-EINVAL);
if(256*1000000L/freq*(100-ivalue)/100<=
LIRC_SERIAL_TRANSMITTER_LATENCY) return(-EINVAL);
duty_cycle=ivalue;
period=256*1000000L/freq;
pulse_width=period*duty_cycle/100;
space_width=period-pulse_width;
#endif
# ifdef DEBUG
printk(KERN_WARNING LIRC_DRIVER_NAME
": after SET_SEND_DUTY_CYCLE, freq=%d pulse=%ld, "
"space=%ld, conv_us_to_clocks=%ld\n",
freq, pulse_width, space_width, conv_us_to_clocks);
# endif
break;
case LIRC_SET_SEND_CARRIER:
# ifdef KERNEL_2_1
result=get_user(ivalue,(unsigned int *) arg);
if(result) return(result);
# else
result=verify_area(VERIFY_READ,(unsigned int *) arg,
sizeof(unsigned int));
if(result) return(result);
ivalue=get_user((unsigned int *) arg);
# endif
if(ivalue>500000 || ivalue<20000) return(-EINVAL);
# ifdef USE_RDTSC
freq=ivalue;
calc_pulse_lengths_in_clocks();
# else /* !USE_RDTSC */
if(256*1000000L/freq*ivalue/100<=
LIRC_SERIAL_TRANSMITTER_LATENCY) return(-EINVAL);
if(256*1000000L/freq*(100-ivalue)/100<=
LIRC_SERIAL_TRANSMITTER_LATENCY) return(-EINVAL);
freq=ivalue;
period=256*1000000L/freq;
pulse_width=period*duty_cycle/100;
space_width=period-pulse_width;
# endif /* USE_RDTSC */
# ifdef DEBUG
printk(KERN_WARNING LIRC_DRIVER_NAME
": after SET_SEND_CARRIER, freq=%d pulse=%ld, "
"space=%ld, conv_us_to_clocks=%ld\n",
freq, pulse_width, space_width, conv_us_to_clocks);
# endif
break;
# endif
# endif
default:
return(-ENOIOCTLCMD);
}
return(0);
}
static struct file_operations lirc_fops =
{
read: lirc_read,
write: lirc_write,
# ifdef KERNEL_2_1
poll: lirc_poll,
# else
select: lirc_select,
# endif
ioctl: lirc_ioctl,
open: lirc_open,
release: lirc_close
};
#ifdef MODULE
#if LINUX_VERSION_CODE >= 0x020100
MODULE_AUTHOR("Ralph Metzler, Trent Piepho, Ben Pfaff, Christoph Bartelmus");
MODULE_DESCRIPTION("Infrared receiver driver for serial ports.");
MODULE_PARM(port, "i");
MODULE_PARM_DESC(port, "I/O address (0x3f8 or 0x2f8)");
MODULE_PARM(irq, "i");
MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
MODULE_PARM(sense, "i");
MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
" (0 = active high, 1 = active low )");
EXPORT_NO_SYMBOLS;
#endif
int init_module(void)
{
int result;
if ((result = init_port()) < 0)
return result;
if (register_chrdev(major, LIRC_DRIVER_NAME, &lirc_fops) < 0) {
printk(KERN_ERR LIRC_DRIVER_NAME
": register_chrdev failed!\n");
release_region(port, 8);
return -EIO;
}
return 0;
}
void cleanup_module(void)
{
release_region(port, 8);
unregister_chrdev(major, LIRC_DRIVER_NAME);
# ifdef DEBUG
printk(KERN_INFO LIRC_DRIVER_NAME ": cleaned up module\n");
# endif
}
#endif