--- /dev/null
+/*
+ * 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 ***/
+
+#ifdef CONFIG_SMP
+#error "--- Sorry, this driver is not SMP safe. ---"
+#endif
+
+#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/signal.h>
+#include <linux/irq.h>
+#include <linux/uaccess.h>
+#include <asm/div64.h>
+
+#include <linux/poll.h>
+#include <linux/parport.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 (!module_refcount(THIS_MODULE))
+ 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) {
+ /* ajust value to usecs */
+ unsigned long long helper;
+
+ helper = ((unsigned long long) 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;
+
+ 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)
+ return -EIO;
+ }
+
+ /* adjust values from usecs */
+ for (i = 0; i < count; i++) {
+ unsigned long long helper;
+
+ helper = ((unsigned long long) 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);
+ return -EIO;
+ }
+ } 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);
+ return -EIO;
+ }
+ } while (counttimer < wbuf[i]);
+ i++;
+ }
+ local_irq_restore(flags);
+#else
+ /* place code that handles write without external timer here */
+#endif
+ return n;
+}
+
+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;
+ unsigned long features = LIRC_CAN_SET_TRANSMITTER_MASK |
+ LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2;
+ unsigned long mode;
+ unsigned int ivalue;
+
+ switch (cmd) {
+ case LIRC_GET_FEATURES:
+ result = put_user(features, (unsigned long *) arg);
+ if (result)
+ return result;
+ break;
+ case LIRC_GET_SEND_MODE:
+ result = put_user(LIRC_MODE_PULSE, (unsigned long *) arg);
+ if (result)
+ return result;
+ break;
+ case LIRC_GET_REC_MODE:
+ result = put_user(LIRC_MODE_MODE2, (unsigned long *) arg);
+ if (result)
+ return result;
+ break;
+ case LIRC_SET_SEND_MODE:
+ result = get_user(mode, (unsigned long *) arg);
+ if (result)
+ return result;
+ if (mode != LIRC_MODE_PULSE)
+ return -EINVAL;
+ break;
+ case LIRC_SET_REC_MODE:
+ result = get_user(mode, (unsigned long *) arg);
+ if (result)
+ return result;
+ if (mode != LIRC_MODE_MODE2)
+ return -ENOSYS;
+ break;
+ case LIRC_SET_TRANSMITTER_MASK:
+ result = get_user(ivalue, (unsigned int *) arg);
+ if (result)
+ return result;
+ if ((ivalue & LIRC_PARALLEL_TRANSMITTER_MASK) != ivalue)
+ return LIRC_PARALLEL_MAX_TRANSMITTERS;
+ tx_mask = ivalue;
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static int lirc_open(struct inode *node, struct file *filep)
+{
+ if (module_refcount(THIS_MODULE) || !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 struct file_operations lirc_fops = {
+ .owner = THIS_MODULE,
+ .llseek = lirc_lseek,
+ .read = lirc_read,
+ .write = lirc_write,
+ .poll = lirc_poll,
+ .unlocked_ioctl = lirc_ioctl,
+ .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 int pf(void *handle);
+static void kf(void *handle);
+
+static struct timer_list poll_timer;
+static void poll_state(unsigned long ignored);
+
+static void poll_state(unsigned long ignored)
+{
+ printk(KERN_NOTICE "%s: time\n",
+ LIRC_DRIVER_NAME);
+ del_timer(&poll_timer);
+ if (is_claimed)
+ return;
+ kf(NULL);
+ if (!is_claimed) {
+ printk(KERN_NOTICE "%s: could not claim port, giving up\n",
+ LIRC_DRIVER_NAME);
+ init_timer(&poll_timer);
+ poll_timer.expires = jiffies + HZ;
+ poll_timer.data = (unsigned long)current;
+ poll_timer.function = poll_state;
+ add_timer(&poll_timer);
+ }
+}
+
+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)
+{
+ pport = parport_find_base(io);
+ if (pport == NULL) {
+ printk(KERN_NOTICE "%s: no port at %x found\n",
+ LIRC_DRIVER_NAME, io);
+ return -ENXIO;
+ }
+ 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);
+ return -ENXIO;
+ }
+ 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);
+ return -EIO;
+ }
+
+#endif
+ if (debug)
+ out(LIRC_PORT_DATA, 0);
+#endif
+
+ is_claimed = 0;
+ parport_release(ppdevice);
+ skip_init:
+ 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);
+ return -EIO;
+ }
+ printk(KERN_INFO "%s: installed using port 0x%04x irq %d\n",
+ LIRC_DRIVER_NAME, io, irq);
+ return 0;
+}
+
+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)");
git.openpandora.org / pandora-kernel.git / blobdiff