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Merge git://git.infradead.org/users/dwmw2/libraid-2.6 into for-linus
[deliverable/linux.git] / drivers / staging / lirc / lirc_it87.c
1 /*
2 * LIRC driver for ITE IT8712/IT8705 CIR port
3 *
4 * Copyright (C) 2001 Hans-Gunter Lutke Uphues <hg_lu@web.de>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of the
9 * License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19 * USA
20 *
21 * ITE IT8705 and IT8712(not tested) and IT8720 CIR-port support for lirc based
22 * via cut and paste from lirc_sir.c (C) 2000 Milan Pikula
23 *
24 * Attention: Sendmode only tested with debugging logs
25 *
26 * 2001/02/27 Christoph Bartelmus <lirc@bartelmus.de> :
27 * reimplemented read function
28 * 2005/06/05 Andrew Calkin implemented support for Asus Digimatrix,
29 * based on work of the following member of the Outertrack Digimatrix
30 * Forum: Art103 <r_tay@hotmail.com>
31 * 2009/12/24 James Edwards <jimbo-lirc@edwardsclan.net> implemeted support
32 * for ITE8704/ITE8718, on my machine, the DSDT reports 8704, but the
33 * chip identifies as 18.
34 */
35
36 #include <linux/module.h>
37 #include <linux/sched.h>
38 #include <linux/errno.h>
39 #include <linux/signal.h>
40 #include <linux/fs.h>
41 #include <linux/interrupt.h>
42 #include <linux/ioport.h>
43 #include <linux/kernel.h>
44 #include <linux/time.h>
45 #include <linux/string.h>
46 #include <linux/types.h>
47 #include <linux/wait.h>
48 #include <linux/mm.h>
49 #include <linux/delay.h>
50 #include <linux/poll.h>
51 #include <asm/system.h>
52 #include <linux/io.h>
53 #include <linux/irq.h>
54 #include <linux/fcntl.h>
55
56 #include <linux/timer.h>
57 #include <linux/pnp.h>
58
59 #include <media/lirc.h>
60 #include <media/lirc_dev.h>
61
62 #include "lirc_it87.h"
63
64 #ifdef LIRC_IT87_DIGIMATRIX
65 static int digimatrix = 1;
66 static int it87_freq = 36; /* kHz */
67 static int irq = 9;
68 #else
69 static int digimatrix;
70 static int it87_freq = 38; /* kHz */
71 static int irq = IT87_CIR_DEFAULT_IRQ;
72 #endif
73
74 static unsigned long it87_bits_in_byte_out;
75 static unsigned long it87_send_counter;
76 static unsigned char it87_RXEN_mask = IT87_CIR_RCR_RXEN;
77
78 #define RBUF_LEN 1024
79
80 #define LIRC_DRIVER_NAME "lirc_it87"
81
82 /* timeout for sequences in jiffies (=5/100s) */
83 /* must be longer than TIME_CONST */
84 #define IT87_TIMEOUT (HZ*5/100)
85
86 /* module parameters */
87 static int debug;
88 #define dprintk(fmt, args...) \
89 do { \
90 if (debug) \
91 printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
92 fmt, ## args); \
93 } while (0)
94
95 static int io = IT87_CIR_DEFAULT_IOBASE;
96 /* receiver demodulator default: off */
97 static int it87_enable_demodulator;
98
99 static int timer_enabled;
100 static DEFINE_SPINLOCK(timer_lock);
101 static struct timer_list timerlist;
102 /* time of last signal change detected */
103 static struct timeval last_tv = {0, 0};
104 /* time of last UART data ready interrupt */
105 static struct timeval last_intr_tv = {0, 0};
106 static int last_value;
107
108 static DECLARE_WAIT_QUEUE_HEAD(lirc_read_queue);
109
110 static DEFINE_SPINLOCK(hardware_lock);
111 static DEFINE_SPINLOCK(dev_lock);
112
113 static int rx_buf[RBUF_LEN];
114 unsigned int rx_tail, rx_head;
115
116 static struct pnp_driver it87_pnp_driver;
117
118 /* SECTION: Prototypes */
119
120 /* Communication with user-space */
121 static int lirc_open(struct inode *inode, struct file *file);
122 static int lirc_close(struct inode *inode, struct file *file);
123 static unsigned int lirc_poll(struct file *file, poll_table *wait);
124 static ssize_t lirc_read(struct file *file, char *buf,
125 size_t count, loff_t *ppos);
126 static ssize_t lirc_write(struct file *file, const char *buf,
127 size_t n, loff_t *pos);
128 static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
129 static void add_read_queue(int flag, unsigned long val);
130 static int init_chrdev(void);
131 static void drop_chrdev(void);
132 /* Hardware */
133 static irqreturn_t it87_interrupt(int irq, void *dev_id);
134 static void send_space(unsigned long len);
135 static void send_pulse(unsigned long len);
136 static void init_send(void);
137 static void terminate_send(unsigned long len);
138 static int init_hardware(void);
139 static void drop_hardware(void);
140 /* Initialisation */
141 static int init_port(void);
142 static void drop_port(void);
143
144
145 /* SECTION: Communication with user-space */
146
147 static int lirc_open(struct inode *inode, struct file *file)
148 {
149 spin_lock(&dev_lock);
150 if (module_refcount(THIS_MODULE)) {
151 spin_unlock(&dev_lock);
152 return -EBUSY;
153 }
154 spin_unlock(&dev_lock);
155 return 0;
156 }
157
158
159 static int lirc_close(struct inode *inode, struct file *file)
160 {
161 return 0;
162 }
163
164
165 static unsigned int lirc_poll(struct file *file, poll_table *wait)
166 {
167 poll_wait(file, &lirc_read_queue, wait);
168 if (rx_head != rx_tail)
169 return POLLIN | POLLRDNORM;
170 return 0;
171 }
172
173
174 static ssize_t lirc_read(struct file *file, char *buf,
175 size_t count, loff_t *ppos)
176 {
177 int n = 0;
178 int retval = 0;
179
180 while (n < count) {
181 if (file->f_flags & O_NONBLOCK && rx_head == rx_tail) {
182 retval = -EAGAIN;
183 break;
184 }
185 retval = wait_event_interruptible(lirc_read_queue,
186 rx_head != rx_tail);
187 if (retval)
188 break;
189
190 if (copy_to_user((void *) buf + n, (void *) (rx_buf + rx_head),
191 sizeof(int))) {
192 retval = -EFAULT;
193 break;
194 }
195 rx_head = (rx_head + 1) & (RBUF_LEN - 1);
196 n += sizeof(int);
197 }
198 if (n)
199 return n;
200 return retval;
201 }
202
203
204 static ssize_t lirc_write(struct file *file, const char *buf,
205 size_t n, loff_t *pos)
206 {
207 int i = 0;
208 int *tx_buf;
209
210 if (n % sizeof(int))
211 return -EINVAL;
212 tx_buf = memdup_user(buf, n);
213 if (IS_ERR(tx_buf))
214 return PTR_ERR(tx_buf);
215 n /= sizeof(int);
216 init_send();
217 while (1) {
218 if (i >= n)
219 break;
220 if (tx_buf[i])
221 send_pulse(tx_buf[i]);
222 i++;
223 if (i >= n)
224 break;
225 if (tx_buf[i])
226 send_space(tx_buf[i]);
227 i++;
228 }
229 terminate_send(tx_buf[i - 1]);
230 return n;
231 }
232
233
234 static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
235 {
236 int retval = 0;
237 unsigned long value = 0;
238 unsigned int ivalue;
239 unsigned long hw_flags;
240
241 if (cmd == LIRC_GET_FEATURES)
242 value = LIRC_CAN_SEND_PULSE |
243 LIRC_CAN_SET_SEND_CARRIER |
244 LIRC_CAN_REC_MODE2;
245 else if (cmd == LIRC_GET_SEND_MODE)
246 value = LIRC_MODE_PULSE;
247 else if (cmd == LIRC_GET_REC_MODE)
248 value = LIRC_MODE_MODE2;
249
250 switch (cmd) {
251 case LIRC_GET_FEATURES:
252 case LIRC_GET_SEND_MODE:
253 case LIRC_GET_REC_MODE:
254 retval = put_user(value, (unsigned long *) arg);
255 break;
256
257 case LIRC_SET_SEND_MODE:
258 case LIRC_SET_REC_MODE:
259 retval = get_user(value, (unsigned long *) arg);
260 break;
261
262 case LIRC_SET_SEND_CARRIER:
263 retval = get_user(ivalue, (unsigned int *) arg);
264 if (retval)
265 return retval;
266 ivalue /= 1000;
267 if (ivalue > IT87_CIR_FREQ_MAX ||
268 ivalue < IT87_CIR_FREQ_MIN)
269 return -EINVAL;
270
271 it87_freq = ivalue;
272
273 spin_lock_irqsave(&hardware_lock, hw_flags);
274 outb(((inb(io + IT87_CIR_TCR2) & IT87_CIR_TCR2_TXMPW) |
275 (it87_freq - IT87_CIR_FREQ_MIN) << 3),
276 io + IT87_CIR_TCR2);
277 spin_unlock_irqrestore(&hardware_lock, hw_flags);
278 dprintk("demodulation frequency: %d kHz\n", it87_freq);
279
280 break;
281
282 default:
283 retval = -EINVAL;
284 }
285
286 if (retval)
287 return retval;
288
289 if (cmd == LIRC_SET_REC_MODE) {
290 if (value != LIRC_MODE_MODE2)
291 retval = -ENOSYS;
292 } else if (cmd == LIRC_SET_SEND_MODE) {
293 if (value != LIRC_MODE_PULSE)
294 retval = -ENOSYS;
295 }
296 return retval;
297 }
298
299 static void add_read_queue(int flag, unsigned long val)
300 {
301 unsigned int new_rx_tail;
302 int newval;
303
304 dprintk("add flag %d with val %lu\n", flag, val);
305
306 newval = val & PULSE_MASK;
307
308 /*
309 * statistically, pulses are ~TIME_CONST/2 too long. we could
310 * maybe make this more exact, but this is good enough
311 */
312 if (flag) {
313 /* pulse */
314 if (newval > TIME_CONST / 2)
315 newval -= TIME_CONST / 2;
316 else /* should not ever happen */
317 newval = 1;
318 newval |= PULSE_BIT;
319 } else
320 newval += TIME_CONST / 2;
321 new_rx_tail = (rx_tail + 1) & (RBUF_LEN - 1);
322 if (new_rx_tail == rx_head) {
323 dprintk("Buffer overrun.\n");
324 return;
325 }
326 rx_buf[rx_tail] = newval;
327 rx_tail = new_rx_tail;
328 wake_up_interruptible(&lirc_read_queue);
329 }
330
331
332 static const struct file_operations lirc_fops = {
333 .owner = THIS_MODULE,
334 .read = lirc_read,
335 .write = lirc_write,
336 .poll = lirc_poll,
337 .unlocked_ioctl = lirc_ioctl,
338 .open = lirc_open,
339 .release = lirc_close,
340 };
341
342 static int set_use_inc(void *data)
343 {
344 return 0;
345 }
346
347 static void set_use_dec(void *data)
348 {
349 }
350
351 static struct lirc_driver driver = {
352 .name = LIRC_DRIVER_NAME,
353 .minor = -1,
354 .code_length = 1,
355 .sample_rate = 0,
356 .data = NULL,
357 .add_to_buf = NULL,
358 .set_use_inc = set_use_inc,
359 .set_use_dec = set_use_dec,
360 .fops = &lirc_fops,
361 .dev = NULL,
362 .owner = THIS_MODULE,
363 };
364
365
366 #ifdef MODULE
367 static int init_chrdev(void)
368 {
369 driver.minor = lirc_register_driver(&driver);
370
371 if (driver.minor < 0) {
372 printk(KERN_ERR LIRC_DRIVER_NAME ": init_chrdev() failed.\n");
373 return -EIO;
374 }
375 return 0;
376 }
377
378
379 static void drop_chrdev(void)
380 {
381 lirc_unregister_driver(driver.minor);
382 }
383 #endif
384
385
386 /* SECTION: Hardware */
387 static long delta(struct timeval *tv1, struct timeval *tv2)
388 {
389 unsigned long deltv;
390
391 deltv = tv2->tv_sec - tv1->tv_sec;
392 if (deltv > 15)
393 deltv = 0xFFFFFF;
394 else
395 deltv = deltv*1000000 + tv2->tv_usec - tv1->tv_usec;
396 return deltv;
397 }
398
399 static void it87_timeout(unsigned long data)
400 {
401 unsigned long flags;
402
403 /* avoid interference with interrupt */
404 spin_lock_irqsave(&timer_lock, flags);
405
406 if (digimatrix) {
407 /* We have timed out. Disable the RX mechanism. */
408
409 outb((inb(io + IT87_CIR_RCR) & ~IT87_CIR_RCR_RXEN) |
410 IT87_CIR_RCR_RXACT, io + IT87_CIR_RCR);
411 if (it87_RXEN_mask)
412 outb(inb(io + IT87_CIR_RCR) | IT87_CIR_RCR_RXEN,
413 io + IT87_CIR_RCR);
414 dprintk(" TIMEOUT\n");
415 timer_enabled = 0;
416
417 /* fifo clear */
418 outb(inb(io + IT87_CIR_TCR1) | IT87_CIR_TCR1_FIFOCLR,
419 io+IT87_CIR_TCR1);
420
421 } else {
422 /*
423 * if last received signal was a pulse, but receiving stopped
424 * within the 9 bit frame, we need to finish this pulse and
425 * simulate a signal change to from pulse to space. Otherwise
426 * upper layers will receive two sequences next time.
427 */
428
429 if (last_value) {
430 unsigned long pulse_end;
431
432 /* determine 'virtual' pulse end: */
433 pulse_end = delta(&last_tv, &last_intr_tv);
434 dprintk("timeout add %d for %lu usec\n",
435 last_value, pulse_end);
436 add_read_queue(last_value, pulse_end);
437 last_value = 0;
438 last_tv = last_intr_tv;
439 }
440 }
441 spin_unlock_irqrestore(&timer_lock, flags);
442 }
443
444 static irqreturn_t it87_interrupt(int irq, void *dev_id)
445 {
446 unsigned char data;
447 struct timeval curr_tv;
448 static unsigned long deltv;
449 unsigned long deltintrtv;
450 unsigned long flags, hw_flags;
451 int iir, lsr;
452 int fifo = 0;
453 static char lastbit;
454 char bit;
455
456 /* Bit duration in microseconds */
457 const unsigned long bit_duration = 1000000ul /
458 (115200 / IT87_CIR_BAUDRATE_DIVISOR);
459
460
461 iir = inb(io + IT87_CIR_IIR);
462
463 switch (iir & IT87_CIR_IIR_IID) {
464 case 0x4:
465 case 0x6:
466 lsr = inb(io + IT87_CIR_RSR) & (IT87_CIR_RSR_RXFTO |
467 IT87_CIR_RSR_RXFBC);
468 fifo = lsr & IT87_CIR_RSR_RXFBC;
469 dprintk("iir: 0x%x fifo: 0x%x\n", iir, lsr);
470
471 /* avoid interference with timer */
472 spin_lock_irqsave(&timer_lock, flags);
473 spin_lock_irqsave(&hardware_lock, hw_flags);
474 if (digimatrix) {
475 static unsigned long acc_pulse;
476 static unsigned long acc_space;
477
478 do {
479 data = inb(io + IT87_CIR_DR);
480 data = ~data;
481 fifo--;
482 if (data != 0x00) {
483 if (timer_enabled)
484 del_timer(&timerlist);
485 /*
486 * start timer for end of
487 * sequence detection
488 */
489 timerlist.expires = jiffies +
490 IT87_TIMEOUT;
491 add_timer(&timerlist);
492 timer_enabled = 1;
493 }
494 /* Loop through */
495 for (bit = 0; bit < 8; ++bit) {
496 if ((data >> bit) & 1) {
497 ++acc_pulse;
498 if (lastbit == 0) {
499 add_read_queue(0,
500 acc_space *
501 bit_duration);
502 acc_space = 0;
503 }
504 } else {
505 ++acc_space;
506 if (lastbit == 1) {
507 add_read_queue(1,
508 acc_pulse *
509 bit_duration);
510 acc_pulse = 0;
511 }
512 }
513 lastbit = (data >> bit) & 1;
514 }
515
516 } while (fifo != 0);
517 } else { /* Normal Operation */
518 do {
519 del_timer(&timerlist);
520 data = inb(io + IT87_CIR_DR);
521
522 dprintk("data=%02x\n", data);
523 do_gettimeofday(&curr_tv);
524 deltv = delta(&last_tv, &curr_tv);
525 deltintrtv = delta(&last_intr_tv, &curr_tv);
526
527 dprintk("t %lu , d %d\n",
528 deltintrtv, (int)data);
529
530 /*
531 * if nothing came in last 2 cycles,
532 * it was gap
533 */
534 if (deltintrtv > TIME_CONST * 2) {
535 if (last_value) {
536 dprintk("GAP\n");
537
538 /* simulate signal change */
539 add_read_queue(last_value,
540 deltv -
541 deltintrtv);
542 last_value = 0;
543 last_tv.tv_sec =
544 last_intr_tv.tv_sec;
545 last_tv.tv_usec =
546 last_intr_tv.tv_usec;
547 deltv = deltintrtv;
548 }
549 }
550 data = 1;
551 if (data ^ last_value) {
552 /*
553 * deltintrtv > 2*TIME_CONST,
554 * remember ? the other case is
555 * timeout
556 */
557 add_read_queue(last_value,
558 deltv-TIME_CONST);
559 last_value = data;
560 last_tv = curr_tv;
561 if (last_tv.tv_usec >= TIME_CONST)
562 last_tv.tv_usec -= TIME_CONST;
563 else {
564 last_tv.tv_sec--;
565 last_tv.tv_usec += 1000000 -
566 TIME_CONST;
567 }
568 }
569 last_intr_tv = curr_tv;
570 if (data) {
571 /*
572 * start timer for end of
573 * sequence detection
574 */
575 timerlist.expires =
576 jiffies + IT87_TIMEOUT;
577 add_timer(&timerlist);
578 }
579 outb((inb(io + IT87_CIR_RCR) &
580 ~IT87_CIR_RCR_RXEN) |
581 IT87_CIR_RCR_RXACT,
582 io + IT87_CIR_RCR);
583 if (it87_RXEN_mask)
584 outb(inb(io + IT87_CIR_RCR) |
585 IT87_CIR_RCR_RXEN,
586 io + IT87_CIR_RCR);
587 fifo--;
588 } while (fifo != 0);
589 }
590 spin_unlock_irqrestore(&hardware_lock, hw_flags);
591 spin_unlock_irqrestore(&timer_lock, flags);
592
593 return IRQ_RETVAL(IRQ_HANDLED);
594
595 default:
596 /* not our irq */
597 dprintk("unknown IRQ (shouldn't happen) !!\n");
598 return IRQ_RETVAL(IRQ_NONE);
599 }
600 }
601
602
603 static void send_it87(unsigned long len, unsigned long stime,
604 unsigned char send_byte, unsigned int count_bits)
605 {
606 long count = len / stime;
607 long time_left = 0;
608 static unsigned char byte_out;
609 unsigned long hw_flags;
610
611 dprintk("%s: len=%ld, sb=%d\n", __func__, len, send_byte);
612
613 time_left = (long)len - (long)count * (long)stime;
614 count += ((2 * time_left) / stime);
615 while (count) {
616 long i = 0;
617 for (i = 0; i < count_bits; i++) {
618 byte_out = (byte_out << 1) | (send_byte & 1);
619 it87_bits_in_byte_out++;
620 }
621 if (it87_bits_in_byte_out == 8) {
622 dprintk("out=0x%x, tsr_txfbc: 0x%x\n",
623 byte_out,
624 inb(io + IT87_CIR_TSR) &
625 IT87_CIR_TSR_TXFBC);
626
627 while ((inb(io + IT87_CIR_TSR) &
628 IT87_CIR_TSR_TXFBC) >= IT87_CIR_FIFO_SIZE)
629 ;
630
631 spin_lock_irqsave(&hardware_lock, hw_flags);
632 outb(byte_out, io + IT87_CIR_DR);
633 spin_unlock_irqrestore(&hardware_lock, hw_flags);
634
635 it87_bits_in_byte_out = 0;
636 it87_send_counter++;
637 byte_out = 0;
638 }
639 count--;
640 }
641 }
642
643
644 /*TODO: maybe exchange space and pulse because it8705 only modulates 0-bits */
645
646 static void send_space(unsigned long len)
647 {
648 send_it87(len, TIME_CONST, IT87_CIR_SPACE, IT87_CIR_BAUDRATE_DIVISOR);
649 }
650
651 static void send_pulse(unsigned long len)
652 {
653 send_it87(len, TIME_CONST, IT87_CIR_PULSE, IT87_CIR_BAUDRATE_DIVISOR);
654 }
655
656
657 static void init_send()
658 {
659 unsigned long flags;
660
661 spin_lock_irqsave(&hardware_lock, flags);
662 /* RXEN=0: receiver disable */
663 it87_RXEN_mask = 0;
664 outb(inb(io + IT87_CIR_RCR) & ~IT87_CIR_RCR_RXEN,
665 io + IT87_CIR_RCR);
666 spin_unlock_irqrestore(&hardware_lock, flags);
667 it87_bits_in_byte_out = 0;
668 it87_send_counter = 0;
669 }
670
671
672 static void terminate_send(unsigned long len)
673 {
674 unsigned long flags;
675 unsigned long last = 0;
676
677 last = it87_send_counter;
678 /* make sure all necessary data has been sent */
679 while (last == it87_send_counter)
680 send_space(len);
681 /* wait until all data sent */
682 while ((inb(io + IT87_CIR_TSR) & IT87_CIR_TSR_TXFBC) != 0)
683 ;
684 /* then re-enable receiver */
685 spin_lock_irqsave(&hardware_lock, flags);
686 it87_RXEN_mask = IT87_CIR_RCR_RXEN;
687 outb(inb(io + IT87_CIR_RCR) | IT87_CIR_RCR_RXEN,
688 io + IT87_CIR_RCR);
689 spin_unlock_irqrestore(&hardware_lock, flags);
690 }
691
692
693 static int init_hardware(void)
694 {
695 unsigned long flags;
696 unsigned char it87_rcr = 0;
697
698 spin_lock_irqsave(&hardware_lock, flags);
699 /* init cir-port */
700 /* enable r/w-access to Baudrate-Register */
701 outb(IT87_CIR_IER_BR, io + IT87_CIR_IER);
702 outb(IT87_CIR_BAUDRATE_DIVISOR % 0x100, io+IT87_CIR_BDLR);
703 outb(IT87_CIR_BAUDRATE_DIVISOR / 0x100, io+IT87_CIR_BDHR);
704 /* Baudrate Register off, define IRQs: Input only */
705 if (digimatrix) {
706 outb(IT87_CIR_IER_IEC | IT87_CIR_IER_RFOIE, io + IT87_CIR_IER);
707 /* RX: HCFS=0, RXDCR = 001b (33,75..38,25 kHz), RXEN=1 */
708 } else {
709 outb(IT87_CIR_IER_IEC | IT87_CIR_IER_RDAIE, io + IT87_CIR_IER);
710 /* RX: HCFS=0, RXDCR = 001b (35,6..40,3 kHz), RXEN=1 */
711 }
712 it87_rcr = (IT87_CIR_RCR_RXEN & it87_RXEN_mask) | 0x1;
713 if (it87_enable_demodulator)
714 it87_rcr |= IT87_CIR_RCR_RXEND;
715 outb(it87_rcr, io + IT87_CIR_RCR);
716 if (digimatrix) {
717 /* Set FIFO depth to 1 byte, and disable TX */
718 outb(inb(io + IT87_CIR_TCR1) | 0x00,
719 io + IT87_CIR_TCR1);
720
721 /*
722 * TX: it87_freq (36kHz), 'reserved' sensitivity
723 * setting (0x00)
724 */
725 outb(((it87_freq - IT87_CIR_FREQ_MIN) << 3) | 0x00,
726 io + IT87_CIR_TCR2);
727 } else {
728 /* TX: 38kHz, 13,3us (pulse-width) */
729 outb(((it87_freq - IT87_CIR_FREQ_MIN) << 3) | 0x06,
730 io + IT87_CIR_TCR2);
731 }
732 spin_unlock_irqrestore(&hardware_lock, flags);
733 return 0;
734 }
735
736
737 static void drop_hardware(void)
738 {
739 unsigned long flags;
740
741 spin_lock_irqsave(&hardware_lock, flags);
742 disable_irq(irq);
743 /* receiver disable */
744 it87_RXEN_mask = 0;
745 outb(0x1, io + IT87_CIR_RCR);
746 /* turn off irqs */
747 outb(0, io + IT87_CIR_IER);
748 /* fifo clear */
749 outb(IT87_CIR_TCR1_FIFOCLR, io+IT87_CIR_TCR1);
750 /* reset */
751 outb(IT87_CIR_IER_RESET, io+IT87_CIR_IER);
752 enable_irq(irq);
753 spin_unlock_irqrestore(&hardware_lock, flags);
754 }
755
756
757 static unsigned char it87_read(unsigned char port)
758 {
759 outb(port, IT87_ADRPORT);
760 return inb(IT87_DATAPORT);
761 }
762
763
764 static void it87_write(unsigned char port, unsigned char data)
765 {
766 outb(port, IT87_ADRPORT);
767 outb(data, IT87_DATAPORT);
768 }
769
770
771 /* SECTION: Initialisation */
772
773 static int init_port(void)
774 {
775 unsigned long hw_flags;
776 int retval = 0;
777
778 unsigned char init_bytes[4] = IT87_INIT;
779 unsigned char it87_chipid = 0;
780 unsigned char ldn = 0;
781 unsigned int it87_io = 0;
782 unsigned int it87_irq = 0;
783
784 /* Enter MB PnP Mode */
785 outb(init_bytes[0], IT87_ADRPORT);
786 outb(init_bytes[1], IT87_ADRPORT);
787 outb(init_bytes[2], IT87_ADRPORT);
788 outb(init_bytes[3], IT87_ADRPORT);
789
790 /* 8712 or 8705 ? */
791 it87_chipid = it87_read(IT87_CHIP_ID1);
792 if (it87_chipid != 0x87) {
793 retval = -ENXIO;
794 return retval;
795 }
796 it87_chipid = it87_read(IT87_CHIP_ID2);
797 if ((it87_chipid != 0x05) &&
798 (it87_chipid != 0x12) &&
799 (it87_chipid != 0x18) &&
800 (it87_chipid != 0x20)) {
801 printk(KERN_INFO LIRC_DRIVER_NAME
802 ": no IT8704/05/12/18/20 found (claimed IT87%02x), "
803 "exiting..\n", it87_chipid);
804 retval = -ENXIO;
805 return retval;
806 }
807 printk(KERN_INFO LIRC_DRIVER_NAME
808 ": found IT87%02x.\n",
809 it87_chipid);
810
811 /* get I/O-Port and IRQ */
812 if (it87_chipid == 0x12 || it87_chipid == 0x18)
813 ldn = IT8712_CIR_LDN;
814 else
815 ldn = IT8705_CIR_LDN;
816 it87_write(IT87_LDN, ldn);
817
818 it87_io = it87_read(IT87_CIR_BASE_MSB) * 256 +
819 it87_read(IT87_CIR_BASE_LSB);
820 if (it87_io == 0) {
821 if (io == 0)
822 io = IT87_CIR_DEFAULT_IOBASE;
823 printk(KERN_INFO LIRC_DRIVER_NAME
824 ": set default io 0x%x\n",
825 io);
826 it87_write(IT87_CIR_BASE_MSB, io / 0x100);
827 it87_write(IT87_CIR_BASE_LSB, io % 0x100);
828 } else
829 io = it87_io;
830
831 it87_irq = it87_read(IT87_CIR_IRQ);
832 if (digimatrix || it87_irq == 0) {
833 if (irq == 0)
834 irq = IT87_CIR_DEFAULT_IRQ;
835 printk(KERN_INFO LIRC_DRIVER_NAME
836 ": set default irq 0x%x\n",
837 irq);
838 it87_write(IT87_CIR_IRQ, irq);
839 } else
840 irq = it87_irq;
841
842 spin_lock_irqsave(&hardware_lock, hw_flags);
843 /* reset */
844 outb(IT87_CIR_IER_RESET, io+IT87_CIR_IER);
845 /* fifo clear */
846 outb(IT87_CIR_TCR1_FIFOCLR |
847 /* IT87_CIR_TCR1_ILE | */
848 IT87_CIR_TCR1_TXRLE |
849 IT87_CIR_TCR1_TXENDF, io+IT87_CIR_TCR1);
850 spin_unlock_irqrestore(&hardware_lock, hw_flags);
851
852 /* get I/O port access and IRQ line */
853 if (request_region(io, 8, LIRC_DRIVER_NAME) == NULL) {
854 printk(KERN_ERR LIRC_DRIVER_NAME
855 ": i/o port 0x%.4x already in use.\n", io);
856 /* Leaving MB PnP Mode */
857 it87_write(IT87_CFGCTRL, 0x2);
858 return -EBUSY;
859 }
860
861 /* activate CIR-Device */
862 it87_write(IT87_CIR_ACT, 0x1);
863
864 /* Leaving MB PnP Mode */
865 it87_write(IT87_CFGCTRL, 0x2);
866
867 retval = request_irq(irq, it87_interrupt, 0 /*IRQF_DISABLED*/,
868 LIRC_DRIVER_NAME, NULL);
869 if (retval < 0) {
870 printk(KERN_ERR LIRC_DRIVER_NAME
871 ": IRQ %d already in use.\n",
872 irq);
873 release_region(io, 8);
874 return retval;
875 }
876
877 printk(KERN_INFO LIRC_DRIVER_NAME
878 ": I/O port 0x%.4x, IRQ %d.\n", io, irq);
879
880 init_timer(&timerlist);
881 timerlist.function = it87_timeout;
882 timerlist.data = 0xabadcafe;
883
884 return 0;
885 }
886
887
888 static void drop_port(void)
889 {
890 #if 0
891 unsigned char init_bytes[4] = IT87_INIT;
892
893 /* Enter MB PnP Mode */
894 outb(init_bytes[0], IT87_ADRPORT);
895 outb(init_bytes[1], IT87_ADRPORT);
896 outb(init_bytes[2], IT87_ADRPORT);
897 outb(init_bytes[3], IT87_ADRPORT);
898
899 /* deactivate CIR-Device */
900 it87_write(IT87_CIR_ACT, 0x0);
901
902 /* Leaving MB PnP Mode */
903 it87_write(IT87_CFGCTRL, 0x2);
904 #endif
905
906 del_timer_sync(&timerlist);
907 free_irq(irq, NULL);
908 release_region(io, 8);
909 }
910
911
912 static int init_lirc_it87(void)
913 {
914 int retval;
915
916 init_waitqueue_head(&lirc_read_queue);
917 retval = init_port();
918 if (retval < 0)
919 return retval;
920 init_hardware();
921 printk(KERN_INFO LIRC_DRIVER_NAME ": Installed.\n");
922 return 0;
923 }
924
925 static int it87_probe(struct pnp_dev *pnp_dev,
926 const struct pnp_device_id *dev_id)
927 {
928 int retval;
929
930 driver.dev = &pnp_dev->dev;
931
932 retval = init_chrdev();
933 if (retval < 0)
934 return retval;
935
936 retval = init_lirc_it87();
937 if (retval)
938 goto init_lirc_it87_failed;
939
940 return 0;
941
942 init_lirc_it87_failed:
943 drop_chrdev();
944
945 return retval;
946 }
947
948 static int __init lirc_it87_init(void)
949 {
950 return pnp_register_driver(&it87_pnp_driver);
951 }
952
953
954 static void __exit lirc_it87_exit(void)
955 {
956 drop_hardware();
957 drop_chrdev();
958 drop_port();
959 pnp_unregister_driver(&it87_pnp_driver);
960 printk(KERN_INFO LIRC_DRIVER_NAME ": Uninstalled.\n");
961 }
962
963 /* SECTION: PNP for ITE8704/18 */
964
965 static const struct pnp_device_id pnp_dev_table[] = {
966 {"ITE8704", 0},
967 {}
968 };
969
970 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
971
972 static struct pnp_driver it87_pnp_driver = {
973 .name = LIRC_DRIVER_NAME,
974 .id_table = pnp_dev_table,
975 .probe = it87_probe,
976 };
977
978 module_init(lirc_it87_init);
979 module_exit(lirc_it87_exit);
980
981 MODULE_DESCRIPTION("LIRC driver for ITE IT8704/05/12/18/20 CIR port");
982 MODULE_AUTHOR("Hans-Gunter Lutke Uphues");
983 MODULE_LICENSE("GPL");
984
985 module_param(io, int, S_IRUGO);
986 MODULE_PARM_DESC(io, "I/O base address (default: 0x310)");
987
988 module_param(irq, int, S_IRUGO);
989 #ifdef LIRC_IT87_DIGIMATRIX
990 MODULE_PARM_DESC(irq, "Interrupt (1,3-12) (default: 9)");
991 #else
992 MODULE_PARM_DESC(irq, "Interrupt (1,3-12) (default: 7)");
993 #endif
994
995 module_param(it87_enable_demodulator, bool, S_IRUGO);
996 MODULE_PARM_DESC(it87_enable_demodulator,
997 "Receiver demodulator enable/disable (1/0), default: 0");
998
999 module_param(debug, bool, S_IRUGO | S_IWUSR);
1000 MODULE_PARM_DESC(debug, "Enable debugging messages");
1001
1002 module_param(digimatrix, bool, S_IRUGO | S_IWUSR);
1003 #ifdef LIRC_IT87_DIGIMATRIX
1004 MODULE_PARM_DESC(digimatrix,
1005 "Asus Digimatrix it87 compat. enable/disable (1/0), default: 1");
1006 #else
1007 MODULE_PARM_DESC(digimatrix,
1008 "Asus Digimatrix it87 compat. enable/disable (1/0), default: 0");
1009 #endif
1010
1011
1012 module_param(it87_freq, int, S_IRUGO);
1013 #ifdef LIRC_IT87_DIGIMATRIX
1014 MODULE_PARM_DESC(it87_freq,
1015 "Carrier demodulator frequency (kHz), (default: 36)");
1016 #else
1017 MODULE_PARM_DESC(it87_freq,
1018 "Carrier demodulator frequency (kHz), (default: 38)");
1019 #endif
Linux kernel - Deliverables
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