4 * lirc_parallel - device driver for infra-red signal receiving and
5 * transmitting unit built by the author
7 * Copyright (C) 1998 Christoph Bartelmus <lirc@bartelmus.de>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #error "--- Sorry, this driver is not SMP safe. ---"
31 #include <linux/module.h>
32 #include <linux/sched.h>
33 #include <linux/errno.h>
34 #include <linux/signal.h>
36 #include <linux/kernel.h>
37 #include <linux/ioport.h>
38 #include <linux/time.h>
40 #include <linux/delay.h>
43 #include <linux/signal.h>
44 #include <linux/irq.h>
45 #include <linux/uaccess.h>
46 #include <asm/div64.h>
48 #include <linux/poll.h>
49 #include <linux/parport.h>
51 #include <media/lirc.h>
52 #include <media/lirc_dev.h>
54 #include "lirc_parallel.h"
56 #define LIRC_DRIVER_NAME "lirc_parallel"
62 #define LIRC_PORT 0x378
65 #define LIRC_TIMER 65536
68 /*** Global Variables ***/
71 static int check_pselecd;
73 unsigned int irq = LIRC_IRQ;
74 unsigned int io = LIRC_PORT;
77 unsigned int default_timer = LIRC_TIMER;
80 #define RBUF_SIZE (256) /* this must be a power of 2 larger than 1 */
82 static int rbuf[RBUF_SIZE];
84 DECLARE_WAIT_QUEUE_HEAD(lirc_wait);
88 unsigned int lost_irqs;
91 struct parport *pport;
92 struct pardevice *ppdevice;
95 unsigned int tx_mask = 1;
97 /*** Internal Functions ***/
99 static unsigned int in(int offset)
103 return parport_read_data(pport);
105 return parport_read_status(pport);
106 case LIRC_LP_CONTROL:
107 return parport_read_control(pport);
109 return 0; /* make compiler happy */
112 static void out(int offset, int value)
116 parport_write_data(pport, value);
118 case LIRC_LP_CONTROL:
119 parport_write_control(pport, value);
122 printk(KERN_INFO "%s: attempt to write to status register\n",
128 static unsigned int lirc_get_timer(void)
130 return in(LIRC_PORT_TIMER) & LIRC_PORT_TIMER_BIT;
133 static unsigned int lirc_get_signal(void)
135 return in(LIRC_PORT_SIGNAL) & LIRC_PORT_SIGNAL_BIT;
138 static void lirc_on(void)
140 out(LIRC_PORT_DATA, tx_mask);
143 static void lirc_off(void)
145 out(LIRC_PORT_DATA, 0);
148 static unsigned int init_lirc_timer(void)
150 struct timeval tv, now;
151 unsigned int level, newlevel, timeelapsed, newtimer;
154 do_gettimeofday(&tv);
155 tv.tv_sec++; /* wait max. 1 sec. */
156 level = lirc_get_timer();
158 newlevel = lirc_get_timer();
159 if (level == 0 && newlevel != 0)
162 do_gettimeofday(&now);
163 } while (count < 1000 && (now.tv_sec < tv.tv_sec
164 || (now.tv_sec == tv.tv_sec
165 && now.tv_usec < tv.tv_usec)));
167 timeelapsed = ((now.tv_sec + 1 - tv.tv_sec)*1000000
168 + (now.tv_usec - tv.tv_usec));
169 if (count >= 1000 && timeelapsed > 0) {
170 if (default_timer == 0) {
171 /* autodetect timer */
172 newtimer = (1000000*count)/timeelapsed;
173 printk(KERN_INFO "%s: %u Hz timer detected\n",
174 LIRC_DRIVER_NAME, newtimer);
177 newtimer = (1000000*count)/timeelapsed;
178 if (abs(newtimer - default_timer) > default_timer/10) {
180 printk(KERN_NOTICE "%s: bad timer: %u Hz\n",
181 LIRC_DRIVER_NAME, newtimer);
182 printk(KERN_NOTICE "%s: using default timer: "
184 LIRC_DRIVER_NAME, default_timer);
185 return default_timer;
187 printk(KERN_INFO "%s: %u Hz timer detected\n",
188 LIRC_DRIVER_NAME, newtimer);
189 return newtimer; /* use detected value */
193 printk(KERN_NOTICE "%s: no timer detected\n", LIRC_DRIVER_NAME);
198 static int lirc_claim(void)
200 if (parport_claim(ppdevice) != 0) {
201 printk(KERN_WARNING "%s: could not claim port\n",
203 printk(KERN_WARNING "%s: waiting for port becoming available"
204 "\n", LIRC_DRIVER_NAME);
205 if (parport_claim_or_block(ppdevice) < 0) {
206 printk(KERN_NOTICE "%s: could not claim port, giving"
207 " up\n", LIRC_DRIVER_NAME);
211 out(LIRC_LP_CONTROL, LP_PSELECP|LP_PINITP);
216 /*** interrupt handler ***/
218 static void rbuf_write(int signal)
222 nwptr = (wptr + 1) & (RBUF_SIZE - 1);
224 /* no new signals will be accepted */
226 printk(KERN_NOTICE "%s: buffer overrun\n", LIRC_DRIVER_NAME);
233 static void irq_handler(void *blah)
236 static struct timeval lasttv;
240 unsigned int level, newlevel;
241 unsigned int timeout;
243 if (!module_refcount(THIS_MODULE))
250 /* disable interrupt */
252 out(LIRC_PORT_IRQ, in(LIRC_PORT_IRQ) & (~LP_PINTEN));
254 if (check_pselecd && (in(1) & LP_PSELECD))
259 do_gettimeofday(&tv);
261 signal = tv.tv_sec - lasttv.tv_sec;
263 /* really long time */
266 data = (int) (signal*1000000 +
267 tv.tv_usec - lasttv.tv_usec +
270 rbuf_write(data); /* space */
274 * wake up; we'll lose this signal, but it will be
275 * garbage if the device is turned on anyway
277 timer = init_lirc_timer();
278 /* enable_irq(irq); */
284 timeout = timer/10; /* timeout after 1/10 sec. */
286 level = lirc_get_timer();
288 newlevel = lirc_get_timer();
289 if (level == 0 && newlevel != 0)
295 || (check_pselecd && (in(1) & LP_PSELECD))) {
297 printk(KERN_NOTICE "%s: timeout\n", LIRC_DRIVER_NAME);
300 } while (lirc_get_signal());
303 /* ajust value to usecs */
304 unsigned long long helper;
306 helper = ((unsigned long long) signal)*1000000;
307 do_div(helper, timer);
308 signal = (long) helper;
310 if (signal > LIRC_SFH506_DELAY)
311 data = signal - LIRC_SFH506_DELAY;
314 rbuf_write(PULSE_BIT|data); /* pulse */
316 do_gettimeofday(&lasttv);
318 /* add your code here */
321 wake_up_interruptible(&lirc_wait);
323 /* enable interrupt */
326 out(LIRC_PORT_IRQ, in(LIRC_PORT_IRQ)|LP_PINTEN);
330 /*** file operations ***/
332 static loff_t lirc_lseek(struct file *filep, loff_t offset, int orig)
337 static ssize_t lirc_read(struct file *filep, char *buf, size_t n, loff_t *ppos)
341 DECLARE_WAITQUEUE(wait, current);
346 add_wait_queue(&lirc_wait, &wait);
347 set_current_state(TASK_INTERRUPTIBLE);
350 if (copy_to_user(buf+count, (char *) &rbuf[rptr],
355 rptr = (rptr + 1) & (RBUF_SIZE - 1);
356 count += sizeof(int);
358 if (filep->f_flags & O_NONBLOCK) {
362 if (signal_pending(current)) {
363 result = -ERESTARTSYS;
367 set_current_state(TASK_INTERRUPTIBLE);
370 remove_wait_queue(&lirc_wait, &wait);
371 set_current_state(TASK_RUNNING);
372 return count ? count : result;
375 static ssize_t lirc_write(struct file *filep, const char *buf, size_t n,
380 unsigned int level, newlevel;
388 count = n / sizeof(int);
390 if (n % sizeof(int) || count % 2 == 0)
393 wbuf = memdup_user(buf, n);
395 return PTR_ERR(wbuf);
399 /* try again if device is ready */
400 timer = init_lirc_timer();
405 /* adjust values from usecs */
406 for (i = 0; i < count; i++) {
407 unsigned long long helper;
409 helper = ((unsigned long long) wbuf[i])*timer;
410 do_div(helper, 1000000);
411 wbuf[i] = (int) helper;
414 local_irq_save(flags);
417 level = lirc_get_timer();
421 newlevel = lirc_get_timer();
422 if (level == 0 && newlevel != 0)
425 if (check_pselecd && (in(1) & LP_PSELECD)) {
427 local_irq_restore(flags);
430 } while (counttimer < wbuf[i]);
438 newlevel = lirc_get_timer();
439 if (level == 0 && newlevel != 0)
442 if (check_pselecd && (in(1) & LP_PSELECD)) {
443 local_irq_restore(flags);
446 } while (counttimer < wbuf[i]);
449 local_irq_restore(flags);
451 /* place code that handles write without external timer here */
456 static unsigned int lirc_poll(struct file *file, poll_table *wait)
458 poll_wait(file, &lirc_wait, wait);
460 return POLLIN | POLLRDNORM;
464 static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
467 unsigned long features = LIRC_CAN_SET_TRANSMITTER_MASK |
468 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2;
473 case LIRC_GET_FEATURES:
474 result = put_user(features, (unsigned long *) arg);
478 case LIRC_GET_SEND_MODE:
479 result = put_user(LIRC_MODE_PULSE, (unsigned long *) arg);
483 case LIRC_GET_REC_MODE:
484 result = put_user(LIRC_MODE_MODE2, (unsigned long *) arg);
488 case LIRC_SET_SEND_MODE:
489 result = get_user(mode, (unsigned long *) arg);
492 if (mode != LIRC_MODE_PULSE)
495 case LIRC_SET_REC_MODE:
496 result = get_user(mode, (unsigned long *) arg);
499 if (mode != LIRC_MODE_MODE2)
502 case LIRC_SET_TRANSMITTER_MASK:
503 result = get_user(ivalue, (unsigned int *) arg);
506 if ((ivalue & LIRC_PARALLEL_TRANSMITTER_MASK) != ivalue)
507 return LIRC_PARALLEL_MAX_TRANSMITTERS;
516 static int lirc_open(struct inode *node, struct file *filep)
518 if (module_refcount(THIS_MODULE) || !lirc_claim())
521 parport_enable_irq(pport);
532 static int lirc_close(struct inode *node, struct file *filep)
536 parport_release(ppdevice);
542 static const struct file_operations lirc_fops = {
543 .owner = THIS_MODULE,
544 .llseek = lirc_lseek,
548 .unlocked_ioctl = lirc_ioctl,
550 .release = lirc_close
553 static int set_use_inc(void *data)
558 static void set_use_dec(void *data)
562 static struct lirc_driver driver = {
563 .name = LIRC_DRIVER_NAME,
569 .set_use_inc = set_use_inc,
570 .set_use_dec = set_use_dec,
573 .owner = THIS_MODULE,
576 static int pf(void *handle);
577 static void kf(void *handle);
579 static struct timer_list poll_timer;
580 static void poll_state(unsigned long ignored);
582 static void poll_state(unsigned long ignored)
584 printk(KERN_NOTICE "%s: time\n",
586 del_timer(&poll_timer);
591 printk(KERN_NOTICE "%s: could not claim port, giving up\n",
593 init_timer(&poll_timer);
594 poll_timer.expires = jiffies + HZ;
595 poll_timer.data = (unsigned long)current;
596 poll_timer.function = poll_state;
597 add_timer(&poll_timer);
601 static int pf(void *handle)
603 parport_disable_irq(pport);
608 static void kf(void *handle)
614 parport_enable_irq(pport);
616 /* this is a bit annoying when you actually print...*/
618 printk(KERN_INFO "%s: reclaimed port\n", LIRC_DRIVER_NAME);
622 /*** module initialization and cleanup ***/
624 static int __init lirc_parallel_init(void)
626 pport = parport_find_base(io);
628 printk(KERN_NOTICE "%s: no port at %x found\n",
629 LIRC_DRIVER_NAME, io);
632 ppdevice = parport_register_device(pport, LIRC_DRIVER_NAME,
633 pf, kf, irq_handler, 0, NULL);
634 parport_put_port(pport);
635 if (ppdevice == NULL) {
636 printk(KERN_NOTICE "%s: parport_register_device() failed\n",
640 if (parport_claim(ppdevice) != 0)
643 out(LIRC_LP_CONTROL, LP_PSELECP|LP_PINITP);
647 out(LIRC_PORT_DATA, tx_mask);
649 timer = init_lirc_timer();
651 #if 0 /* continue even if device is offline */
654 parport_release(pport);
655 parport_unregister_device(ppdevice);
661 out(LIRC_PORT_DATA, 0);
665 parport_release(ppdevice);
667 driver.minor = lirc_register_driver(&driver);
668 if (driver.minor < 0) {
669 printk(KERN_NOTICE "%s: register_chrdev() failed\n",
671 parport_unregister_device(ppdevice);
674 printk(KERN_INFO "%s: installed using port 0x%04x irq %d\n",
675 LIRC_DRIVER_NAME, io, irq);
679 static void __exit lirc_parallel_exit(void)
681 parport_unregister_device(ppdevice);
682 lirc_unregister_driver(driver.minor);
685 module_init(lirc_parallel_init);
686 module_exit(lirc_parallel_exit);
688 MODULE_DESCRIPTION("Infrared receiver driver for parallel ports.");
689 MODULE_AUTHOR("Christoph Bartelmus");
690 MODULE_LICENSE("GPL");
692 module_param(io, int, S_IRUGO);
693 MODULE_PARM_DESC(io, "I/O address base (0x3bc, 0x378 or 0x278)");
695 module_param(irq, int, S_IRUGO);
696 MODULE_PARM_DESC(irq, "Interrupt (7 or 5)");
698 module_param(tx_mask, int, S_IRUGO);
699 MODULE_PARM_DESC(tx_maxk, "Transmitter mask (default: 0x01)");
701 module_param(debug, bool, S_IRUGO | S_IWUSR);
702 MODULE_PARM_DESC(debug, "Enable debugging messages");
704 module_param(check_pselecd, bool, S_IRUGO | S_IWUSR);
705 MODULE_PARM_DESC(debug, "Check for printer (default: 0)");