+++ /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
- *
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-/*** 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/ktime.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 bool debug;
-static bool check_pselecd;
-
-static unsigned int irq = LIRC_IRQ;
-static unsigned int io = LIRC_PORT;
-#ifdef LIRC_TIMER
-static unsigned int timer;
-static 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];
-
-static DECLARE_WAIT_QUEUE_HEAD(lirc_wait);
-
-static unsigned int rptr;
-static unsigned int wptr;
-static unsigned int lost_irqs;
-static int is_open;
-
-static struct parport *pport;
-static struct pardevice *ppdevice;
-static int is_claimed;
-
-static 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:
- pr_info("attempt to write to status register\n");
- 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)
-{
- ktime_t kt, now, timeout;
- unsigned int level, newlevel, timeelapsed, newtimer;
- int count = 0;
-
- kt = ktime_get();
- /* wait max. 1 sec. */
- timeout = ktime_add_ns(kt, NSEC_PER_SEC);
- level = lirc_get_timer();
- do {
- newlevel = lirc_get_timer();
- if (level == 0 && newlevel != 0)
- count++;
- level = newlevel;
- now = ktime_get();
- } while (count < 1000 && (ktime_before(now, timeout)));
- timeelapsed = ktime_us_delta(now, kt);
- if (count >= 1000 && timeelapsed > 0) {
- if (default_timer == 0) {
- /* autodetect timer */
- newtimer = (1000000 * count) / timeelapsed;
- pr_info("%u Hz timer detected\n", newtimer);
- return newtimer;
- }
- newtimer = (1000000 * count) / timeelapsed;
- if (abs(newtimer - default_timer) > default_timer / 10) {
- /* bad timer */
- pr_notice("bad timer: %u Hz\n", newtimer);
- pr_notice("using default timer: %u Hz\n",
- default_timer);
- return default_timer;
- }
- pr_info("%u Hz timer detected\n", newtimer);
- return newtimer; /* use detected value */
- }
-
- pr_notice("no timer detected\n");
- return 0;
-}
-
-static int lirc_claim(void)
-{
- if (parport_claim(ppdevice) != 0) {
- pr_warn("could not claim port\n");
- pr_warn("waiting for port becoming available\n");
- if (parport_claim_or_block(ppdevice) < 0) {
- pr_notice("could not claim port, giving up\n");
- 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++;
- pr_notice("buffer overrun\n");
- return;
- }
- rbuf[wptr] = signal;
- wptr = nwptr;
-}
-
-static void lirc_lirc_irq_handler(void *blah)
-{
- ktime_t kt, delkt;
- static ktime_t lastkt;
- 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) {
- kt = ktime_get();
-
- delkt = ktime_sub(kt, lastkt);
- if (ktime_compare(delkt, ktime_set(15, 0)) > 0)
- /* really long time */
- data = PULSE_MASK;
- else
- data = (int)(ktime_to_us(delkt) + 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;
- pr_notice("timeout\n");
- 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 */
- }
- lastkt = ktime_get();
-#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 __user *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, &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 __user *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 __user *uptr = (u32 __user *)arg;
- 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, uptr);
- if (result)
- return result;
- break;
- case LIRC_GET_SEND_MODE:
- result = put_user(LIRC_MODE_PULSE, uptr);
- if (result)
- return result;
- break;
- case LIRC_GET_REC_MODE:
- result = put_user(LIRC_MODE_MODE2, uptr);
- if (result)
- return result;
- break;
- case LIRC_SET_SEND_MODE:
- result = get_user(mode, uptr);
- if (result)
- return result;
- if (mode != LIRC_MODE_PULSE)
- return -EINVAL;
- break;
- case LIRC_SET_REC_MODE:
- result = get_user(mode, uptr);
- if (result)
- return result;
- if (mode != LIRC_MODE_MODE2)
- return -ENOSYS;
- break;
- case LIRC_SET_TRANSMITTER_MASK:
- result = get_user(value, uptr);
- 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 lirc_parallel_probe(struct platform_device *dev)
-{
- return 0;
-}
-
-static int 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 = lirc_parallel_remove,
- .suspend = lirc_parallel_suspend,
- .resume = lirc_parallel_resume,
- .driver = {
- .name = LIRC_DRIVER_NAME,
- },
-};
-
-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) {
- pr_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) {
- pr_notice("no port at %x found\n", io);
- result = -ENXIO;
- goto exit_device_del;
- }
- ppdevice = parport_register_device(pport, LIRC_DRIVER_NAME,
- pf, kf, lirc_lirc_irq_handler, 0,
- NULL);
- parport_put_port(pport);
- if (!ppdevice) {
- pr_notice("parport_register_device() failed\n");
- result = -ENXIO;
- goto exit_device_del;
- }
- 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_del;
- }
-
-#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) {
- pr_notice("register_chrdev() failed\n");
- parport_unregister_device(ppdevice);
- result = -EIO;
- goto exit_device_del;
- }
- pr_info("installed using port 0x%04x irq %d\n", io, irq);
- return 0;
-
-exit_device_del:
- platform_device_del(lirc_parallel_dev);
-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);
-
- platform_device_unregister(lirc_parallel_dev);
- platform_driver_unregister(&lirc_parallel_driver);
-}
-
-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_mask, "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(check_pselecd, "Check for printer (default: 0)");
projects / platform / kernel / linux-rpi.git / commitdiff