- 根目录:
- drivers
- staging
- lirc
- lirc_parallel.c
/*
* lirc_parallel.c
*
* lirc_parallel - device driver for infra-red signal receiving and
* transmitting unit built by the author
*
* Copyright (C) 1998 Christoph Bartelmus <lirc@bartelmus.de>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*** Includes ***/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/uaccess.h>
#include <asm/div64.h>
#include <linux/poll.h>
#include <linux/parport.h>
#include <linux/platform_device.h>
#include <media/lirc.h>
#include <media/lirc_dev.h>
#include "lirc_parallel.h"
#define LIRC_DRIVER_NAME "lirc_parallel"
#ifndef LIRC_IRQ
#define LIRC_IRQ 7
#endif
#ifndef LIRC_PORT
#define LIRC_PORT 0x378
#endif
#ifndef LIRC_TIMER
#define LIRC_TIMER 65536
#endif
/*** Global Variables ***/
static int debug;
static int check_pselecd;
unsigned int irq = LIRC_IRQ;
unsigned int io = LIRC_PORT;
#ifdef LIRC_TIMER
unsigned int timer;
unsigned int default_timer = LIRC_TIMER;
#endif
#define RBUF_SIZE (256) /* this must be a power of 2 larger than 1 */
static int rbuf[RBUF_SIZE];
DECLARE_WAIT_QUEUE_HEAD(lirc_wait);
unsigned int rptr;
unsigned int wptr;
unsigned int lost_irqs;
int is_open;
struct parport *pport;
struct pardevice *ppdevice;
int is_claimed;
unsigned int tx_mask = 1;
/*** Internal Functions ***/
static unsigned int in(int offset)
{
switch (offset) {
case LIRC_LP_BASE:
return parport_read_data(pport);
case LIRC_LP_STATUS:
return parport_read_status(pport);
case LIRC_LP_CONTROL:
return parport_read_control(pport);
}
return 0; /* make compiler happy */
}
static void out(int offset, int value)
{
switch (offset) {
case LIRC_LP_BASE:
parport_write_data(pport, value);
break;
case LIRC_LP_CONTROL:
parport_write_control(pport, value);
break;
case LIRC_LP_STATUS:
printk(KERN_INFO "%s: attempt to write to status register\n",
LIRC_DRIVER_NAME);
break;
}
}
static unsigned int lirc_get_timer(void)
{
return in(LIRC_PORT_TIMER) & LIRC_PORT_TIMER_BIT;
}
static unsigned int lirc_get_signal(void)
{
return in(LIRC_PORT_SIGNAL) & LIRC_PORT_SIGNAL_BIT;
}
static void lirc_on(void)
{
out(LIRC_PORT_DATA, tx_mask);
}
static void lirc_off(void)
{
out(LIRC_PORT_DATA, 0);
}
static unsigned int init_lirc_timer(void)
{
struct timeval tv, now;
unsigned int level, newlevel, timeelapsed, newtimer;
int count = 0;
do_gettimeofday(&tv);
tv.tv_sec++; /* wait max. 1 sec. */
level = lirc_get_timer();
do {
newlevel = lirc_get_timer();
if (level == 0 && newlevel != 0)
count++;
level = newlevel;
do_gettimeofday(&now);
} while (count < 1000 && (now.tv_sec < tv.tv_sec
|| (now.tv_sec == tv.tv_sec
&& now.tv_usec < tv.tv_usec)));
timeelapsed = ((now.tv_sec + 1 - tv.tv_sec)*1000000
+ (now.tv_usec - tv.tv_usec));
if (count >= 1000 && timeelapsed > 0) {
if (default_timer == 0) {
/* autodetect timer */
newtimer = (1000000*count)/timeelapsed;
printk(KERN_INFO "%s: %u Hz timer detected\n",
LIRC_DRIVER_NAME, newtimer);
return newtimer;
} else {
newtimer = (1000000*count)/timeelapsed;
if (abs(newtimer - default_timer) > default_timer/10) {
/* bad timer */
printk(KERN_NOTICE "%s: bad timer: %u Hz\n",
LIRC_DRIVER_NAME, newtimer);
printk(KERN_NOTICE "%s: using default timer: "
"%u Hz\n",
LIRC_DRIVER_NAME, default_timer);
return default_timer;
} else {
printk(KERN_INFO "%s: %u Hz timer detected\n",
LIRC_DRIVER_NAME, newtimer);
return newtimer; /* use detected value */
}
}
} else {
printk(KERN_NOTICE "%s: no timer detected\n", LIRC_DRIVER_NAME);
return 0;
}
}
static int lirc_claim(void)
{
if (parport_claim(ppdevice) != 0) {
printk(KERN_WARNING "%s: could not claim port\n",
LIRC_DRIVER_NAME);
printk(KERN_WARNING "%s: waiting for port becoming available"
"\n", LIRC_DRIVER_NAME);
if (parport_claim_or_block(ppdevice) < 0) {
printk(KERN_NOTICE "%s: could not claim port, giving"
" up\n", LIRC_DRIVER_NAME);
return 0;
}
}
out(LIRC_LP_CONTROL, LP_PSELECP|LP_PINITP);
is_claimed = 1;
return 1;
}
/*** interrupt handler ***/
static void rbuf_write(int signal)
{
unsigned int nwptr;
nwptr = (wptr + 1) & (RBUF_SIZE - 1);
if (nwptr == rptr) {
/* no new signals will be accepted */
lost_irqs++;
printk(KERN_NOTICE "%s: buffer overrun\n", LIRC_DRIVER_NAME);
return;
}
rbuf[wptr] = signal;
wptr = nwptr;
}
static void irq_handler(void *blah)
{
struct timeval tv;
static struct timeval lasttv;
static int init;
long signal;
int data;
unsigned int level, newlevel;
unsigned int timeout;
if (!is_open)
return;
if (!is_claimed)
return;
#if 0
/* disable interrupt */
disable_irq(irq);
out(LIRC_PORT_IRQ, in(LIRC_PORT_IRQ) & (~LP_PINTEN));
#endif
if (check_pselecd && (in(1) & LP_PSELECD))
return;
#ifdef LIRC_TIMER
if (init) {
do_gettimeofday(&tv);
signal = tv.tv_sec - lasttv.tv_sec;
if (signal > 15)
/* really long time */
data = PULSE_MASK;
else
data = (int) (signal*1000000 +
tv.tv_usec - lasttv.tv_usec +
LIRC_SFH506_DELAY);
rbuf_write(data); /* space */
} else {
if (timer == 0) {
/*
* wake up; we'll lose this signal, but it will be
* garbage if the device is turned on anyway
*/
timer = init_lirc_timer();
/* enable_irq(irq); */
return;
}
init = 1;
}
timeout = timer/10; /* timeout after 1/10 sec. */
signal = 1;
level = lirc_get_timer();
do {
newlevel = lirc_get_timer();
if (level == 0 && newlevel != 0)
signal++;
level = newlevel;
/* giving up */
if (signal > timeout
|| (check_pselecd && (in(1) & LP_PSELECD))) {
signal = 0;
printk(KERN_NOTICE "%s: timeout\n", LIRC_DRIVER_NAME);
break;
}
} while (lirc_get_signal());
if (signal != 0) {
/* adjust value to usecs */
__u64 helper;
helper = ((__u64) signal)*1000000;
do_div(helper, timer);
signal = (long) helper;
if (signal > LIRC_SFH506_DELAY)
data = signal - LIRC_SFH506_DELAY;
else
data = 1;
rbuf_write(PULSE_BIT|data); /* pulse */
}
do_gettimeofday(&lasttv);
#else
/* add your code here */
#endif
wake_up_interruptible(&lirc_wait);
/* enable interrupt */
/*
enable_irq(irq);
out(LIRC_PORT_IRQ, in(LIRC_PORT_IRQ)|LP_PINTEN);
*/
}
/*** file operations ***/
static loff_t lirc_lseek(struct file *filep, loff_t offset, int orig)
{
return -ESPIPE;
}
static ssize_t lirc_read(struct file *filep, char *buf, size_t n, loff_t *ppos)
{
int result = 0;
int count = 0;
DECLARE_WAITQUEUE(wait, current);
if (n % sizeof(int))
return -EINVAL;
add_wait_queue(&lirc_wait, &wait);
set_current_state(TASK_INTERRUPTIBLE);
while (count < n) {
if (rptr != wptr) {
if (copy_to_user(buf+count, (char *) &rbuf[rptr],
sizeof(int))) {
result = -EFAULT;
break;
}
rptr = (rptr + 1) & (RBUF_SIZE - 1);
count += sizeof(int);
} else {
if (filep->f_flags & O_NONBLOCK) {
result = -EAGAIN;
break;
}
if (signal_pending(current)) {
result = -ERESTARTSYS;
break;
}
schedule();
set_current_state(TASK_INTERRUPTIBLE);
}
}
remove_wait_queue(&lirc_wait, &wait);
set_current_state(TASK_RUNNING);
return count ? count : result;
}
static ssize_t lirc_write(struct file *filep, const char *buf, size_t n,
loff_t *ppos)
{
int count;
unsigned int i;
unsigned int level, newlevel;
unsigned long flags;
int counttimer;
int *wbuf;
ssize_t ret;
if (!is_claimed)
return -EBUSY;
count = n / sizeof(int);
if (n % sizeof(int) || count % 2 == 0)
return -EINVAL;
wbuf = memdup_user(buf, n);
if (IS_ERR(wbuf))
return PTR_ERR(wbuf);
#ifdef LIRC_TIMER
if (timer == 0) {
/* try again if device is ready */
timer = init_lirc_timer();
if (timer == 0) {
ret = -EIO;
goto out;
}
}
/* adjust values from usecs */
for (i = 0; i < count; i++) {
__u64 helper;
helper = ((__u64) wbuf[i])*timer;
do_div(helper, 1000000);
wbuf[i] = (int) helper;
}
local_irq_save(flags);
i = 0;
while (i < count) {
level = lirc_get_timer();
counttimer = 0;
lirc_on();
do {
newlevel = lirc_get_timer();
if (level == 0 && newlevel != 0)
counttimer++;
level = newlevel;
if (check_pselecd && (in(1) & LP_PSELECD)) {
lirc_off();
local_irq_restore(flags);
ret = -EIO;
goto out;
}
} while (counttimer < wbuf[i]);
i++;
lirc_off();
if (i == count)
break;
counttimer = 0;
do {
newlevel = lirc_get_timer();
if (level == 0 && newlevel != 0)
counttimer++;
level = newlevel;
if (check_pselecd && (in(1) & LP_PSELECD)) {
local_irq_restore(flags);
ret = -EIO;
goto out;
}
} while (counttimer < wbuf[i]);
i++;
}
local_irq_restore(flags);
#else
/* place code that handles write without external timer here */
#endif
ret = n;
out:
kfree(wbuf);
return ret;
}
static unsigned int lirc_poll(struct file *file, poll_table *wait)
{
poll_wait(file, &lirc_wait, wait);
if (rptr != wptr)
return POLLIN | POLLRDNORM;
return 0;
}
static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
{
int result;
__u32 features = LIRC_CAN_SET_TRANSMITTER_MASK |
LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2;
__u32 mode;
__u32 value;
switch (cmd) {
case LIRC_GET_FEATURES:
result = put_user(features, (__u32 *) arg);
if (result)
return result;
break;
case LIRC_GET_SEND_MODE:
result = put_user(LIRC_MODE_PULSE, (__u32 *) arg);
if (result)
return result;
break;
case LIRC_GET_REC_MODE:
result = put_user(LIRC_MODE_MODE2, (__u32 *) arg);
if (result)
return result;
break;
case LIRC_SET_SEND_MODE:
result = get_user(mode, (__u32 *) arg);
if (result)
return result;
if (mode != LIRC_MODE_PULSE)
return -EINVAL;
break;
case LIRC_SET_REC_MODE:
result = get_user(mode, (__u32 *) arg);
if (result)
return result;
if (mode != LIRC_MODE_MODE2)
return -ENOSYS;
break;
case LIRC_SET_TRANSMITTER_MASK:
result = get_user(value, (__u32 *) arg);
if (result)
return result;
if ((value & LIRC_PARALLEL_TRANSMITTER_MASK) != value)
return LIRC_PARALLEL_MAX_TRANSMITTERS;
tx_mask = value;
break;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static int lirc_open(struct inode *node, struct file *filep)
{
if (is_open || !lirc_claim())
return -EBUSY;
parport_enable_irq(pport);
/* init read ptr */
rptr = 0;
wptr = 0;
lost_irqs = 0;
is_open = 1;
return 0;
}
static int lirc_close(struct inode *node, struct file *filep)
{
if (is_claimed) {
is_claimed = 0;
parport_release(ppdevice);
}
is_open = 0;
return 0;
}
static const struct file_operations lirc_fops = {
.owner = THIS_MODULE,
.llseek = lirc_lseek,
.read = lirc_read,
.write = lirc_write,
.poll = lirc_poll,
.unlocked_ioctl = lirc_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = lirc_ioctl,
#endif
.open = lirc_open,
.release = lirc_close
};
static int set_use_inc(void *data)
{
return 0;
}
static void set_use_dec(void *data)
{
}
static struct lirc_driver driver = {
.name = LIRC_DRIVER_NAME,
.minor = -1,
.code_length = 1,
.sample_rate = 0,
.data = NULL,
.add_to_buf = NULL,
.set_use_inc = set_use_inc,
.set_use_dec = set_use_dec,
.fops = &lirc_fops,
.dev = NULL,
.owner = THIS_MODULE,
};
static struct platform_device *lirc_parallel_dev;
static int __devinit lirc_parallel_probe(struct platform_device *dev)
{
return 0;
}
static int __devexit lirc_parallel_remove(struct platform_device *dev)
{
return 0;
}
static int lirc_parallel_suspend(struct platform_device *dev,
pm_message_t state)
{
return 0;
}
static int lirc_parallel_resume(struct platform_device *dev)
{
return 0;
}
static struct platform_driver lirc_parallel_driver = {
.probe = lirc_parallel_probe,
.remove = __devexit_p(lirc_parallel_remove),
.suspend = lirc_parallel_suspend,
.resume = lirc_parallel_resume,
.driver = {
.name = LIRC_DRIVER_NAME,
.owner = THIS_MODULE,
},
};
static int pf(void *handle);
static void kf(void *handle);
static int pf(void *handle)
{
parport_disable_irq(pport);
is_claimed = 0;
return 0;
}
static void kf(void *handle)
{
if (!is_open)
return;
if (!lirc_claim())
return;
parport_enable_irq(pport);
lirc_off();
/* this is a bit annoying when you actually print...*/
/*
printk(KERN_INFO "%s: reclaimed port\n", LIRC_DRIVER_NAME);
*/
}
/*** module initialization and cleanup ***/
static int __init lirc_parallel_init(void)
{
int result;
result = platform_driver_register(&lirc_parallel_driver);
if (result) {
printk(KERN_NOTICE "platform_driver_register"
" returned %d\n", result);
return result;
}
lirc_parallel_dev = platform_device_alloc(LIRC_DRIVER_NAME, 0);
if (!lirc_parallel_dev) {
result = -ENOMEM;
goto exit_driver_unregister;
}
result = platform_device_add(lirc_parallel_dev);
if (result)
goto exit_device_put;
pport = parport_find_base(io);
if (pport == NULL) {
printk(KERN_NOTICE "%s: no port at %x found\n",
LIRC_DRIVER_NAME, io);
result = -ENXIO;
goto exit_device_put;
}
ppdevice = parport_register_device(pport, LIRC_DRIVER_NAME,
pf, kf, irq_handler, 0, NULL);
parport_put_port(pport);
if (ppdevice == NULL) {
printk(KERN_NOTICE "%s: parport_register_device() failed\n",
LIRC_DRIVER_NAME);
result = -ENXIO;
goto exit_device_put;
}
if (parport_claim(ppdevice) != 0)
goto skip_init;
is_claimed = 1;
out(LIRC_LP_CONTROL, LP_PSELECP|LP_PINITP);
#ifdef LIRC_TIMER
if (debug)
out(LIRC_PORT_DATA, tx_mask);
timer = init_lirc_timer();
#if 0 /* continue even if device is offline */
if (timer == 0) {
is_claimed = 0;
parport_release(pport);
parport_unregister_device(ppdevice);
result = -EIO;
goto exit_device_put;
}
#endif
if (debug)
out(LIRC_PORT_DATA, 0);
#endif
is_claimed = 0;
parport_release(ppdevice);
skip_init:
driver.dev = &lirc_parallel_dev->dev;
driver.minor = lirc_register_driver(&driver);
if (driver.minor < 0) {
printk(KERN_NOTICE "%s: register_chrdev() failed\n",
LIRC_DRIVER_NAME);
parport_unregister_device(ppdevice);
result = -EIO;
goto exit_device_put;
}
printk(KERN_INFO "%s: installed using port 0x%04x irq %d\n",
LIRC_DRIVER_NAME, io, irq);
return 0;
exit_device_put:
platform_device_put(lirc_parallel_dev);
exit_driver_unregister:
platform_driver_unregister(&lirc_parallel_driver);
return result;
}
static void __exit lirc_parallel_exit(void)
{
parport_unregister_device(ppdevice);
lirc_unregister_driver(driver.minor);
}
module_init(lirc_parallel_init);
module_exit(lirc_parallel_exit);
MODULE_DESCRIPTION("Infrared receiver driver for parallel ports.");
MODULE_AUTHOR("Christoph Bartelmus");
MODULE_LICENSE("GPL");
module_param(io, int, S_IRUGO);
MODULE_PARM_DESC(io, "I/O address base (0x3bc, 0x378 or 0x278)");
module_param(irq, int, S_IRUGO);
MODULE_PARM_DESC(irq, "Interrupt (7 or 5)");
module_param(tx_mask, int, S_IRUGO);
MODULE_PARM_DESC(tx_maxk, "Transmitter mask (default: 0x01)");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable debugging messages");
module_param(check_pselecd, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Check for printer (default: 0)");