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c147f907 JW |
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); | |
82ce67bf | 112 | static bool device_open; |
c147f907 JW |
113 | |
114 | static int rx_buf[RBUF_LEN]; | |
115 | unsigned int rx_tail, rx_head; | |
116 | ||
117 | static struct pnp_driver it87_pnp_driver; | |
118 | ||
119 | /* SECTION: Prototypes */ | |
120 | ||
121 | /* Communication with user-space */ | |
122 | static int lirc_open(struct inode *inode, struct file *file); | |
123 | static int lirc_close(struct inode *inode, struct file *file); | |
124 | static unsigned int lirc_poll(struct file *file, poll_table *wait); | |
125 | static ssize_t lirc_read(struct file *file, char *buf, | |
126 | size_t count, loff_t *ppos); | |
127 | static ssize_t lirc_write(struct file *file, const char *buf, | |
128 | size_t n, loff_t *pos); | |
129 | static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg); | |
130 | static void add_read_queue(int flag, unsigned long val); | |
131 | static int init_chrdev(void); | |
132 | static void drop_chrdev(void); | |
133 | /* Hardware */ | |
134 | static irqreturn_t it87_interrupt(int irq, void *dev_id); | |
135 | static void send_space(unsigned long len); | |
136 | static void send_pulse(unsigned long len); | |
137 | static void init_send(void); | |
138 | static void terminate_send(unsigned long len); | |
139 | static int init_hardware(void); | |
140 | static void drop_hardware(void); | |
141 | /* Initialisation */ | |
142 | static int init_port(void); | |
143 | static void drop_port(void); | |
144 | ||
145 | ||
146 | /* SECTION: Communication with user-space */ | |
147 | ||
148 | static int lirc_open(struct inode *inode, struct file *file) | |
149 | { | |
150 | spin_lock(&dev_lock); | |
82ce67bf | 151 | if (device_open) { |
c147f907 JW |
152 | spin_unlock(&dev_lock); |
153 | return -EBUSY; | |
154 | } | |
82ce67bf | 155 | device_open = true; |
c147f907 JW |
156 | spin_unlock(&dev_lock); |
157 | return 0; | |
158 | } | |
159 | ||
160 | ||
161 | static int lirc_close(struct inode *inode, struct file *file) | |
162 | { | |
82ce67bf JW |
163 | spin_lock(&dev_lock); |
164 | device_open = false; | |
165 | spin_unlock(&dev_lock); | |
c147f907 JW |
166 | return 0; |
167 | } | |
168 | ||
169 | ||
170 | static unsigned int lirc_poll(struct file *file, poll_table *wait) | |
171 | { | |
172 | poll_wait(file, &lirc_read_queue, wait); | |
173 | if (rx_head != rx_tail) | |
174 | return POLLIN | POLLRDNORM; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | ||
179 | static ssize_t lirc_read(struct file *file, char *buf, | |
180 | size_t count, loff_t *ppos) | |
181 | { | |
182 | int n = 0; | |
183 | int retval = 0; | |
184 | ||
185 | while (n < count) { | |
186 | if (file->f_flags & O_NONBLOCK && rx_head == rx_tail) { | |
187 | retval = -EAGAIN; | |
188 | break; | |
189 | } | |
190 | retval = wait_event_interruptible(lirc_read_queue, | |
191 | rx_head != rx_tail); | |
192 | if (retval) | |
193 | break; | |
194 | ||
195 | if (copy_to_user((void *) buf + n, (void *) (rx_buf + rx_head), | |
196 | sizeof(int))) { | |
197 | retval = -EFAULT; | |
198 | break; | |
199 | } | |
200 | rx_head = (rx_head + 1) & (RBUF_LEN - 1); | |
201 | n += sizeof(int); | |
202 | } | |
203 | if (n) | |
204 | return n; | |
205 | return retval; | |
206 | } | |
207 | ||
208 | ||
209 | static ssize_t lirc_write(struct file *file, const char *buf, | |
210 | size_t n, loff_t *pos) | |
211 | { | |
212 | int i = 0; | |
213 | int *tx_buf; | |
214 | ||
215 | if (n % sizeof(int)) | |
216 | return -EINVAL; | |
217 | tx_buf = memdup_user(buf, n); | |
218 | if (IS_ERR(tx_buf)) | |
219 | return PTR_ERR(tx_buf); | |
220 | n /= sizeof(int); | |
221 | init_send(); | |
222 | while (1) { | |
223 | if (i >= n) | |
224 | break; | |
225 | if (tx_buf[i]) | |
226 | send_pulse(tx_buf[i]); | |
227 | i++; | |
228 | if (i >= n) | |
229 | break; | |
230 | if (tx_buf[i]) | |
231 | send_space(tx_buf[i]); | |
232 | i++; | |
233 | } | |
234 | terminate_send(tx_buf[i - 1]); | |
235 | return n; | |
236 | } | |
237 | ||
238 | ||
239 | static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) | |
240 | { | |
241 | int retval = 0; | |
242 | unsigned long value = 0; | |
243 | unsigned int ivalue; | |
244 | unsigned long hw_flags; | |
245 | ||
246 | if (cmd == LIRC_GET_FEATURES) | |
247 | value = LIRC_CAN_SEND_PULSE | | |
248 | LIRC_CAN_SET_SEND_CARRIER | | |
249 | LIRC_CAN_REC_MODE2; | |
250 | else if (cmd == LIRC_GET_SEND_MODE) | |
251 | value = LIRC_MODE_PULSE; | |
252 | else if (cmd == LIRC_GET_REC_MODE) | |
253 | value = LIRC_MODE_MODE2; | |
254 | ||
255 | switch (cmd) { | |
256 | case LIRC_GET_FEATURES: | |
257 | case LIRC_GET_SEND_MODE: | |
258 | case LIRC_GET_REC_MODE: | |
259 | retval = put_user(value, (unsigned long *) arg); | |
260 | break; | |
261 | ||
262 | case LIRC_SET_SEND_MODE: | |
263 | case LIRC_SET_REC_MODE: | |
264 | retval = get_user(value, (unsigned long *) arg); | |
265 | break; | |
266 | ||
267 | case LIRC_SET_SEND_CARRIER: | |
268 | retval = get_user(ivalue, (unsigned int *) arg); | |
269 | if (retval) | |
270 | return retval; | |
271 | ivalue /= 1000; | |
272 | if (ivalue > IT87_CIR_FREQ_MAX || | |
273 | ivalue < IT87_CIR_FREQ_MIN) | |
274 | return -EINVAL; | |
275 | ||
276 | it87_freq = ivalue; | |
277 | ||
278 | spin_lock_irqsave(&hardware_lock, hw_flags); | |
279 | outb(((inb(io + IT87_CIR_TCR2) & IT87_CIR_TCR2_TXMPW) | | |
280 | (it87_freq - IT87_CIR_FREQ_MIN) << 3), | |
281 | io + IT87_CIR_TCR2); | |
282 | spin_unlock_irqrestore(&hardware_lock, hw_flags); | |
283 | dprintk("demodulation frequency: %d kHz\n", it87_freq); | |
284 | ||
285 | break; | |
286 | ||
287 | default: | |
288 | retval = -EINVAL; | |
289 | } | |
290 | ||
291 | if (retval) | |
292 | return retval; | |
293 | ||
294 | if (cmd == LIRC_SET_REC_MODE) { | |
295 | if (value != LIRC_MODE_MODE2) | |
296 | retval = -ENOSYS; | |
297 | } else if (cmd == LIRC_SET_SEND_MODE) { | |
298 | if (value != LIRC_MODE_PULSE) | |
299 | retval = -ENOSYS; | |
300 | } | |
301 | return retval; | |
302 | } | |
303 | ||
304 | static void add_read_queue(int flag, unsigned long val) | |
305 | { | |
306 | unsigned int new_rx_tail; | |
307 | int newval; | |
308 | ||
309 | dprintk("add flag %d with val %lu\n", flag, val); | |
310 | ||
311 | newval = val & PULSE_MASK; | |
312 | ||
313 | /* | |
314 | * statistically, pulses are ~TIME_CONST/2 too long. we could | |
315 | * maybe make this more exact, but this is good enough | |
316 | */ | |
317 | if (flag) { | |
318 | /* pulse */ | |
319 | if (newval > TIME_CONST / 2) | |
320 | newval -= TIME_CONST / 2; | |
321 | else /* should not ever happen */ | |
322 | newval = 1; | |
323 | newval |= PULSE_BIT; | |
324 | } else | |
325 | newval += TIME_CONST / 2; | |
326 | new_rx_tail = (rx_tail + 1) & (RBUF_LEN - 1); | |
327 | if (new_rx_tail == rx_head) { | |
328 | dprintk("Buffer overrun.\n"); | |
329 | return; | |
330 | } | |
331 | rx_buf[rx_tail] = newval; | |
332 | rx_tail = new_rx_tail; | |
333 | wake_up_interruptible(&lirc_read_queue); | |
334 | } | |
335 | ||
336 | ||
0f9313ad | 337 | static const struct file_operations lirc_fops = { |
c147f907 JW |
338 | .owner = THIS_MODULE, |
339 | .read = lirc_read, | |
340 | .write = lirc_write, | |
341 | .poll = lirc_poll, | |
342 | .unlocked_ioctl = lirc_ioctl, | |
343 | .open = lirc_open, | |
344 | .release = lirc_close, | |
6038f373 | 345 | .llseek = noop_llseek, |
c147f907 JW |
346 | }; |
347 | ||
348 | static int set_use_inc(void *data) | |
349 | { | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static void set_use_dec(void *data) | |
354 | { | |
355 | } | |
356 | ||
357 | static struct lirc_driver driver = { | |
358 | .name = LIRC_DRIVER_NAME, | |
359 | .minor = -1, | |
360 | .code_length = 1, | |
361 | .sample_rate = 0, | |
362 | .data = NULL, | |
363 | .add_to_buf = NULL, | |
364 | .set_use_inc = set_use_inc, | |
365 | .set_use_dec = set_use_dec, | |
366 | .fops = &lirc_fops, | |
367 | .dev = NULL, | |
368 | .owner = THIS_MODULE, | |
369 | }; | |
370 | ||
371 | ||
c147f907 JW |
372 | static int init_chrdev(void) |
373 | { | |
374 | driver.minor = lirc_register_driver(&driver); | |
375 | ||
376 | if (driver.minor < 0) { | |
377 | printk(KERN_ERR LIRC_DRIVER_NAME ": init_chrdev() failed.\n"); | |
378 | return -EIO; | |
379 | } | |
380 | return 0; | |
381 | } | |
382 | ||
383 | ||
384 | static void drop_chrdev(void) | |
385 | { | |
386 | lirc_unregister_driver(driver.minor); | |
387 | } | |
c147f907 JW |
388 | |
389 | ||
390 | /* SECTION: Hardware */ | |
391 | static long delta(struct timeval *tv1, struct timeval *tv2) | |
392 | { | |
393 | unsigned long deltv; | |
394 | ||
395 | deltv = tv2->tv_sec - tv1->tv_sec; | |
396 | if (deltv > 15) | |
397 | deltv = 0xFFFFFF; | |
398 | else | |
399 | deltv = deltv*1000000 + tv2->tv_usec - tv1->tv_usec; | |
400 | return deltv; | |
401 | } | |
402 | ||
403 | static void it87_timeout(unsigned long data) | |
404 | { | |
405 | unsigned long flags; | |
406 | ||
407 | /* avoid interference with interrupt */ | |
408 | spin_lock_irqsave(&timer_lock, flags); | |
409 | ||
410 | if (digimatrix) { | |
411 | /* We have timed out. Disable the RX mechanism. */ | |
412 | ||
413 | outb((inb(io + IT87_CIR_RCR) & ~IT87_CIR_RCR_RXEN) | | |
414 | IT87_CIR_RCR_RXACT, io + IT87_CIR_RCR); | |
415 | if (it87_RXEN_mask) | |
416 | outb(inb(io + IT87_CIR_RCR) | IT87_CIR_RCR_RXEN, | |
417 | io + IT87_CIR_RCR); | |
418 | dprintk(" TIMEOUT\n"); | |
419 | timer_enabled = 0; | |
420 | ||
421 | /* fifo clear */ | |
422 | outb(inb(io + IT87_CIR_TCR1) | IT87_CIR_TCR1_FIFOCLR, | |
423 | io+IT87_CIR_TCR1); | |
424 | ||
425 | } else { | |
426 | /* | |
427 | * if last received signal was a pulse, but receiving stopped | |
428 | * within the 9 bit frame, we need to finish this pulse and | |
429 | * simulate a signal change to from pulse to space. Otherwise | |
430 | * upper layers will receive two sequences next time. | |
431 | */ | |
432 | ||
433 | if (last_value) { | |
434 | unsigned long pulse_end; | |
435 | ||
436 | /* determine 'virtual' pulse end: */ | |
437 | pulse_end = delta(&last_tv, &last_intr_tv); | |
438 | dprintk("timeout add %d for %lu usec\n", | |
439 | last_value, pulse_end); | |
440 | add_read_queue(last_value, pulse_end); | |
441 | last_value = 0; | |
442 | last_tv = last_intr_tv; | |
443 | } | |
444 | } | |
445 | spin_unlock_irqrestore(&timer_lock, flags); | |
446 | } | |
447 | ||
448 | static irqreturn_t it87_interrupt(int irq, void *dev_id) | |
449 | { | |
450 | unsigned char data; | |
451 | struct timeval curr_tv; | |
452 | static unsigned long deltv; | |
453 | unsigned long deltintrtv; | |
454 | unsigned long flags, hw_flags; | |
455 | int iir, lsr; | |
456 | int fifo = 0; | |
457 | static char lastbit; | |
458 | char bit; | |
459 | ||
460 | /* Bit duration in microseconds */ | |
461 | const unsigned long bit_duration = 1000000ul / | |
462 | (115200 / IT87_CIR_BAUDRATE_DIVISOR); | |
463 | ||
464 | ||
465 | iir = inb(io + IT87_CIR_IIR); | |
466 | ||
467 | switch (iir & IT87_CIR_IIR_IID) { | |
468 | case 0x4: | |
469 | case 0x6: | |
470 | lsr = inb(io + IT87_CIR_RSR) & (IT87_CIR_RSR_RXFTO | | |
471 | IT87_CIR_RSR_RXFBC); | |
472 | fifo = lsr & IT87_CIR_RSR_RXFBC; | |
473 | dprintk("iir: 0x%x fifo: 0x%x\n", iir, lsr); | |
474 | ||
475 | /* avoid interference with timer */ | |
476 | spin_lock_irqsave(&timer_lock, flags); | |
477 | spin_lock_irqsave(&hardware_lock, hw_flags); | |
478 | if (digimatrix) { | |
479 | static unsigned long acc_pulse; | |
480 | static unsigned long acc_space; | |
481 | ||
482 | do { | |
483 | data = inb(io + IT87_CIR_DR); | |
484 | data = ~data; | |
485 | fifo--; | |
486 | if (data != 0x00) { | |
487 | if (timer_enabled) | |
488 | del_timer(&timerlist); | |
489 | /* | |
490 | * start timer for end of | |
491 | * sequence detection | |
492 | */ | |
493 | timerlist.expires = jiffies + | |
494 | IT87_TIMEOUT; | |
495 | add_timer(&timerlist); | |
496 | timer_enabled = 1; | |
497 | } | |
498 | /* Loop through */ | |
499 | for (bit = 0; bit < 8; ++bit) { | |
500 | if ((data >> bit) & 1) { | |
501 | ++acc_pulse; | |
502 | if (lastbit == 0) { | |
503 | add_read_queue(0, | |
504 | acc_space * | |
505 | bit_duration); | |
506 | acc_space = 0; | |
507 | } | |
508 | } else { | |
509 | ++acc_space; | |
510 | if (lastbit == 1) { | |
511 | add_read_queue(1, | |
512 | acc_pulse * | |
513 | bit_duration); | |
514 | acc_pulse = 0; | |
515 | } | |
516 | } | |
517 | lastbit = (data >> bit) & 1; | |
518 | } | |
519 | ||
520 | } while (fifo != 0); | |
521 | } else { /* Normal Operation */ | |
522 | do { | |
523 | del_timer(&timerlist); | |
524 | data = inb(io + IT87_CIR_DR); | |
525 | ||
526 | dprintk("data=%02x\n", data); | |
527 | do_gettimeofday(&curr_tv); | |
528 | deltv = delta(&last_tv, &curr_tv); | |
529 | deltintrtv = delta(&last_intr_tv, &curr_tv); | |
530 | ||
531 | dprintk("t %lu , d %d\n", | |
532 | deltintrtv, (int)data); | |
533 | ||
534 | /* | |
535 | * if nothing came in last 2 cycles, | |
536 | * it was gap | |
537 | */ | |
538 | if (deltintrtv > TIME_CONST * 2) { | |
539 | if (last_value) { | |
540 | dprintk("GAP\n"); | |
541 | ||
542 | /* simulate signal change */ | |
543 | add_read_queue(last_value, | |
544 | deltv - | |
545 | deltintrtv); | |
546 | last_value = 0; | |
547 | last_tv.tv_sec = | |
548 | last_intr_tv.tv_sec; | |
549 | last_tv.tv_usec = | |
550 | last_intr_tv.tv_usec; | |
551 | deltv = deltintrtv; | |
552 | } | |
553 | } | |
554 | data = 1; | |
555 | if (data ^ last_value) { | |
556 | /* | |
557 | * deltintrtv > 2*TIME_CONST, | |
558 | * remember ? the other case is | |
559 | * timeout | |
560 | */ | |
561 | add_read_queue(last_value, | |
562 | deltv-TIME_CONST); | |
563 | last_value = data; | |
564 | last_tv = curr_tv; | |
565 | if (last_tv.tv_usec >= TIME_CONST) | |
566 | last_tv.tv_usec -= TIME_CONST; | |
567 | else { | |
568 | last_tv.tv_sec--; | |
569 | last_tv.tv_usec += 1000000 - | |
570 | TIME_CONST; | |
571 | } | |
572 | } | |
573 | last_intr_tv = curr_tv; | |
574 | if (data) { | |
575 | /* | |
576 | * start timer for end of | |
577 | * sequence detection | |
578 | */ | |
579 | timerlist.expires = | |
580 | jiffies + IT87_TIMEOUT; | |
581 | add_timer(&timerlist); | |
582 | } | |
583 | outb((inb(io + IT87_CIR_RCR) & | |
584 | ~IT87_CIR_RCR_RXEN) | | |
585 | IT87_CIR_RCR_RXACT, | |
586 | io + IT87_CIR_RCR); | |
587 | if (it87_RXEN_mask) | |
588 | outb(inb(io + IT87_CIR_RCR) | | |
589 | IT87_CIR_RCR_RXEN, | |
590 | io + IT87_CIR_RCR); | |
591 | fifo--; | |
592 | } while (fifo != 0); | |
593 | } | |
594 | spin_unlock_irqrestore(&hardware_lock, hw_flags); | |
595 | spin_unlock_irqrestore(&timer_lock, flags); | |
596 | ||
597 | return IRQ_RETVAL(IRQ_HANDLED); | |
598 | ||
599 | default: | |
600 | /* not our irq */ | |
601 | dprintk("unknown IRQ (shouldn't happen) !!\n"); | |
602 | return IRQ_RETVAL(IRQ_NONE); | |
603 | } | |
604 | } | |
605 | ||
606 | ||
607 | static void send_it87(unsigned long len, unsigned long stime, | |
608 | unsigned char send_byte, unsigned int count_bits) | |
609 | { | |
610 | long count = len / stime; | |
611 | long time_left = 0; | |
612 | static unsigned char byte_out; | |
613 | unsigned long hw_flags; | |
614 | ||
615 | dprintk("%s: len=%ld, sb=%d\n", __func__, len, send_byte); | |
616 | ||
617 | time_left = (long)len - (long)count * (long)stime; | |
618 | count += ((2 * time_left) / stime); | |
619 | while (count) { | |
620 | long i = 0; | |
621 | for (i = 0; i < count_bits; i++) { | |
622 | byte_out = (byte_out << 1) | (send_byte & 1); | |
623 | it87_bits_in_byte_out++; | |
624 | } | |
625 | if (it87_bits_in_byte_out == 8) { | |
626 | dprintk("out=0x%x, tsr_txfbc: 0x%x\n", | |
627 | byte_out, | |
628 | inb(io + IT87_CIR_TSR) & | |
629 | IT87_CIR_TSR_TXFBC); | |
630 | ||
631 | while ((inb(io + IT87_CIR_TSR) & | |
632 | IT87_CIR_TSR_TXFBC) >= IT87_CIR_FIFO_SIZE) | |
633 | ; | |
634 | ||
635 | spin_lock_irqsave(&hardware_lock, hw_flags); | |
636 | outb(byte_out, io + IT87_CIR_DR); | |
637 | spin_unlock_irqrestore(&hardware_lock, hw_flags); | |
638 | ||
639 | it87_bits_in_byte_out = 0; | |
640 | it87_send_counter++; | |
641 | byte_out = 0; | |
642 | } | |
643 | count--; | |
644 | } | |
645 | } | |
646 | ||
647 | ||
648 | /*TODO: maybe exchange space and pulse because it8705 only modulates 0-bits */ | |
649 | ||
650 | static void send_space(unsigned long len) | |
651 | { | |
652 | send_it87(len, TIME_CONST, IT87_CIR_SPACE, IT87_CIR_BAUDRATE_DIVISOR); | |
653 | } | |
654 | ||
655 | static void send_pulse(unsigned long len) | |
656 | { | |
657 | send_it87(len, TIME_CONST, IT87_CIR_PULSE, IT87_CIR_BAUDRATE_DIVISOR); | |
658 | } | |
659 | ||
660 | ||
661 | static void init_send() | |
662 | { | |
663 | unsigned long flags; | |
664 | ||
665 | spin_lock_irqsave(&hardware_lock, flags); | |
666 | /* RXEN=0: receiver disable */ | |
667 | it87_RXEN_mask = 0; | |
668 | outb(inb(io + IT87_CIR_RCR) & ~IT87_CIR_RCR_RXEN, | |
669 | io + IT87_CIR_RCR); | |
670 | spin_unlock_irqrestore(&hardware_lock, flags); | |
671 | it87_bits_in_byte_out = 0; | |
672 | it87_send_counter = 0; | |
673 | } | |
674 | ||
675 | ||
676 | static void terminate_send(unsigned long len) | |
677 | { | |
678 | unsigned long flags; | |
679 | unsigned long last = 0; | |
680 | ||
681 | last = it87_send_counter; | |
682 | /* make sure all necessary data has been sent */ | |
683 | while (last == it87_send_counter) | |
684 | send_space(len); | |
685 | /* wait until all data sent */ | |
686 | while ((inb(io + IT87_CIR_TSR) & IT87_CIR_TSR_TXFBC) != 0) | |
687 | ; | |
688 | /* then re-enable receiver */ | |
689 | spin_lock_irqsave(&hardware_lock, flags); | |
690 | it87_RXEN_mask = IT87_CIR_RCR_RXEN; | |
691 | outb(inb(io + IT87_CIR_RCR) | IT87_CIR_RCR_RXEN, | |
692 | io + IT87_CIR_RCR); | |
693 | spin_unlock_irqrestore(&hardware_lock, flags); | |
694 | } | |
695 | ||
696 | ||
697 | static int init_hardware(void) | |
698 | { | |
699 | unsigned long flags; | |
700 | unsigned char it87_rcr = 0; | |
701 | ||
702 | spin_lock_irqsave(&hardware_lock, flags); | |
703 | /* init cir-port */ | |
704 | /* enable r/w-access to Baudrate-Register */ | |
705 | outb(IT87_CIR_IER_BR, io + IT87_CIR_IER); | |
706 | outb(IT87_CIR_BAUDRATE_DIVISOR % 0x100, io+IT87_CIR_BDLR); | |
707 | outb(IT87_CIR_BAUDRATE_DIVISOR / 0x100, io+IT87_CIR_BDHR); | |
708 | /* Baudrate Register off, define IRQs: Input only */ | |
709 | if (digimatrix) { | |
710 | outb(IT87_CIR_IER_IEC | IT87_CIR_IER_RFOIE, io + IT87_CIR_IER); | |
711 | /* RX: HCFS=0, RXDCR = 001b (33,75..38,25 kHz), RXEN=1 */ | |
712 | } else { | |
713 | outb(IT87_CIR_IER_IEC | IT87_CIR_IER_RDAIE, io + IT87_CIR_IER); | |
714 | /* RX: HCFS=0, RXDCR = 001b (35,6..40,3 kHz), RXEN=1 */ | |
715 | } | |
716 | it87_rcr = (IT87_CIR_RCR_RXEN & it87_RXEN_mask) | 0x1; | |
717 | if (it87_enable_demodulator) | |
718 | it87_rcr |= IT87_CIR_RCR_RXEND; | |
719 | outb(it87_rcr, io + IT87_CIR_RCR); | |
720 | if (digimatrix) { | |
721 | /* Set FIFO depth to 1 byte, and disable TX */ | |
722 | outb(inb(io + IT87_CIR_TCR1) | 0x00, | |
723 | io + IT87_CIR_TCR1); | |
724 | ||
725 | /* | |
726 | * TX: it87_freq (36kHz), 'reserved' sensitivity | |
727 | * setting (0x00) | |
728 | */ | |
729 | outb(((it87_freq - IT87_CIR_FREQ_MIN) << 3) | 0x00, | |
730 | io + IT87_CIR_TCR2); | |
731 | } else { | |
732 | /* TX: 38kHz, 13,3us (pulse-width) */ | |
733 | outb(((it87_freq - IT87_CIR_FREQ_MIN) << 3) | 0x06, | |
734 | io + IT87_CIR_TCR2); | |
735 | } | |
736 | spin_unlock_irqrestore(&hardware_lock, flags); | |
737 | return 0; | |
738 | } | |
739 | ||
740 | ||
741 | static void drop_hardware(void) | |
742 | { | |
743 | unsigned long flags; | |
744 | ||
745 | spin_lock_irqsave(&hardware_lock, flags); | |
746 | disable_irq(irq); | |
747 | /* receiver disable */ | |
748 | it87_RXEN_mask = 0; | |
749 | outb(0x1, io + IT87_CIR_RCR); | |
750 | /* turn off irqs */ | |
751 | outb(0, io + IT87_CIR_IER); | |
752 | /* fifo clear */ | |
753 | outb(IT87_CIR_TCR1_FIFOCLR, io+IT87_CIR_TCR1); | |
754 | /* reset */ | |
755 | outb(IT87_CIR_IER_RESET, io+IT87_CIR_IER); | |
756 | enable_irq(irq); | |
757 | spin_unlock_irqrestore(&hardware_lock, flags); | |
758 | } | |
759 | ||
760 | ||
761 | static unsigned char it87_read(unsigned char port) | |
762 | { | |
763 | outb(port, IT87_ADRPORT); | |
764 | return inb(IT87_DATAPORT); | |
765 | } | |
766 | ||
767 | ||
768 | static void it87_write(unsigned char port, unsigned char data) | |
769 | { | |
770 | outb(port, IT87_ADRPORT); | |
771 | outb(data, IT87_DATAPORT); | |
772 | } | |
773 | ||
774 | ||
775 | /* SECTION: Initialisation */ | |
776 | ||
777 | static int init_port(void) | |
778 | { | |
779 | unsigned long hw_flags; | |
780 | int retval = 0; | |
781 | ||
782 | unsigned char init_bytes[4] = IT87_INIT; | |
783 | unsigned char it87_chipid = 0; | |
784 | unsigned char ldn = 0; | |
785 | unsigned int it87_io = 0; | |
786 | unsigned int it87_irq = 0; | |
787 | ||
788 | /* Enter MB PnP Mode */ | |
789 | outb(init_bytes[0], IT87_ADRPORT); | |
790 | outb(init_bytes[1], IT87_ADRPORT); | |
791 | outb(init_bytes[2], IT87_ADRPORT); | |
792 | outb(init_bytes[3], IT87_ADRPORT); | |
793 | ||
794 | /* 8712 or 8705 ? */ | |
795 | it87_chipid = it87_read(IT87_CHIP_ID1); | |
796 | if (it87_chipid != 0x87) { | |
797 | retval = -ENXIO; | |
798 | return retval; | |
799 | } | |
800 | it87_chipid = it87_read(IT87_CHIP_ID2); | |
801 | if ((it87_chipid != 0x05) && | |
802 | (it87_chipid != 0x12) && | |
803 | (it87_chipid != 0x18) && | |
804 | (it87_chipid != 0x20)) { | |
805 | printk(KERN_INFO LIRC_DRIVER_NAME | |
806 | ": no IT8704/05/12/18/20 found (claimed IT87%02x), " | |
807 | "exiting..\n", it87_chipid); | |
808 | retval = -ENXIO; | |
809 | return retval; | |
810 | } | |
811 | printk(KERN_INFO LIRC_DRIVER_NAME | |
812 | ": found IT87%02x.\n", | |
813 | it87_chipid); | |
814 | ||
815 | /* get I/O-Port and IRQ */ | |
816 | if (it87_chipid == 0x12 || it87_chipid == 0x18) | |
817 | ldn = IT8712_CIR_LDN; | |
818 | else | |
819 | ldn = IT8705_CIR_LDN; | |
820 | it87_write(IT87_LDN, ldn); | |
821 | ||
822 | it87_io = it87_read(IT87_CIR_BASE_MSB) * 256 + | |
823 | it87_read(IT87_CIR_BASE_LSB); | |
824 | if (it87_io == 0) { | |
825 | if (io == 0) | |
826 | io = IT87_CIR_DEFAULT_IOBASE; | |
827 | printk(KERN_INFO LIRC_DRIVER_NAME | |
828 | ": set default io 0x%x\n", | |
829 | io); | |
830 | it87_write(IT87_CIR_BASE_MSB, io / 0x100); | |
831 | it87_write(IT87_CIR_BASE_LSB, io % 0x100); | |
832 | } else | |
833 | io = it87_io; | |
834 | ||
835 | it87_irq = it87_read(IT87_CIR_IRQ); | |
836 | if (digimatrix || it87_irq == 0) { | |
837 | if (irq == 0) | |
838 | irq = IT87_CIR_DEFAULT_IRQ; | |
839 | printk(KERN_INFO LIRC_DRIVER_NAME | |
840 | ": set default irq 0x%x\n", | |
841 | irq); | |
842 | it87_write(IT87_CIR_IRQ, irq); | |
843 | } else | |
844 | irq = it87_irq; | |
845 | ||
846 | spin_lock_irqsave(&hardware_lock, hw_flags); | |
847 | /* reset */ | |
848 | outb(IT87_CIR_IER_RESET, io+IT87_CIR_IER); | |
849 | /* fifo clear */ | |
850 | outb(IT87_CIR_TCR1_FIFOCLR | | |
851 | /* IT87_CIR_TCR1_ILE | */ | |
852 | IT87_CIR_TCR1_TXRLE | | |
853 | IT87_CIR_TCR1_TXENDF, io+IT87_CIR_TCR1); | |
854 | spin_unlock_irqrestore(&hardware_lock, hw_flags); | |
855 | ||
856 | /* get I/O port access and IRQ line */ | |
857 | if (request_region(io, 8, LIRC_DRIVER_NAME) == NULL) { | |
858 | printk(KERN_ERR LIRC_DRIVER_NAME | |
859 | ": i/o port 0x%.4x already in use.\n", io); | |
860 | /* Leaving MB PnP Mode */ | |
861 | it87_write(IT87_CFGCTRL, 0x2); | |
862 | return -EBUSY; | |
863 | } | |
864 | ||
865 | /* activate CIR-Device */ | |
866 | it87_write(IT87_CIR_ACT, 0x1); | |
867 | ||
868 | /* Leaving MB PnP Mode */ | |
869 | it87_write(IT87_CFGCTRL, 0x2); | |
870 | ||
871 | retval = request_irq(irq, it87_interrupt, 0 /*IRQF_DISABLED*/, | |
872 | LIRC_DRIVER_NAME, NULL); | |
873 | if (retval < 0) { | |
874 | printk(KERN_ERR LIRC_DRIVER_NAME | |
875 | ": IRQ %d already in use.\n", | |
876 | irq); | |
877 | release_region(io, 8); | |
878 | return retval; | |
879 | } | |
880 | ||
881 | printk(KERN_INFO LIRC_DRIVER_NAME | |
882 | ": I/O port 0x%.4x, IRQ %d.\n", io, irq); | |
883 | ||
884 | init_timer(&timerlist); | |
885 | timerlist.function = it87_timeout; | |
886 | timerlist.data = 0xabadcafe; | |
887 | ||
888 | return 0; | |
889 | } | |
890 | ||
891 | ||
892 | static void drop_port(void) | |
893 | { | |
894 | #if 0 | |
895 | unsigned char init_bytes[4] = IT87_INIT; | |
896 | ||
897 | /* Enter MB PnP Mode */ | |
898 | outb(init_bytes[0], IT87_ADRPORT); | |
899 | outb(init_bytes[1], IT87_ADRPORT); | |
900 | outb(init_bytes[2], IT87_ADRPORT); | |
901 | outb(init_bytes[3], IT87_ADRPORT); | |
902 | ||
903 | /* deactivate CIR-Device */ | |
904 | it87_write(IT87_CIR_ACT, 0x0); | |
905 | ||
906 | /* Leaving MB PnP Mode */ | |
907 | it87_write(IT87_CFGCTRL, 0x2); | |
908 | #endif | |
909 | ||
910 | del_timer_sync(&timerlist); | |
911 | free_irq(irq, NULL); | |
912 | release_region(io, 8); | |
913 | } | |
914 | ||
915 | ||
916 | static int init_lirc_it87(void) | |
917 | { | |
918 | int retval; | |
919 | ||
920 | init_waitqueue_head(&lirc_read_queue); | |
921 | retval = init_port(); | |
922 | if (retval < 0) | |
923 | return retval; | |
924 | init_hardware(); | |
925 | printk(KERN_INFO LIRC_DRIVER_NAME ": Installed.\n"); | |
926 | return 0; | |
927 | } | |
928 | ||
929 | static int it87_probe(struct pnp_dev *pnp_dev, | |
930 | const struct pnp_device_id *dev_id) | |
931 | { | |
932 | int retval; | |
933 | ||
934 | driver.dev = &pnp_dev->dev; | |
935 | ||
936 | retval = init_chrdev(); | |
937 | if (retval < 0) | |
938 | return retval; | |
939 | ||
940 | retval = init_lirc_it87(); | |
941 | if (retval) | |
942 | goto init_lirc_it87_failed; | |
943 | ||
944 | return 0; | |
945 | ||
946 | init_lirc_it87_failed: | |
947 | drop_chrdev(); | |
948 | ||
949 | return retval; | |
950 | } | |
951 | ||
952 | static int __init lirc_it87_init(void) | |
953 | { | |
954 | return pnp_register_driver(&it87_pnp_driver); | |
955 | } | |
956 | ||
957 | ||
958 | static void __exit lirc_it87_exit(void) | |
959 | { | |
960 | drop_hardware(); | |
961 | drop_chrdev(); | |
962 | drop_port(); | |
963 | pnp_unregister_driver(&it87_pnp_driver); | |
964 | printk(KERN_INFO LIRC_DRIVER_NAME ": Uninstalled.\n"); | |
965 | } | |
966 | ||
967 | /* SECTION: PNP for ITE8704/18 */ | |
968 | ||
969 | static const struct pnp_device_id pnp_dev_table[] = { | |
970 | {"ITE8704", 0}, | |
971 | {} | |
972 | }; | |
973 | ||
974 | MODULE_DEVICE_TABLE(pnp, pnp_dev_table); | |
975 | ||
976 | static struct pnp_driver it87_pnp_driver = { | |
977 | .name = LIRC_DRIVER_NAME, | |
978 | .id_table = pnp_dev_table, | |
979 | .probe = it87_probe, | |
980 | }; | |
981 | ||
982 | module_init(lirc_it87_init); | |
983 | module_exit(lirc_it87_exit); | |
984 | ||
985 | MODULE_DESCRIPTION("LIRC driver for ITE IT8704/05/12/18/20 CIR port"); | |
986 | MODULE_AUTHOR("Hans-Gunter Lutke Uphues"); | |
987 | MODULE_LICENSE("GPL"); | |
988 | ||
989 | module_param(io, int, S_IRUGO); | |
990 | MODULE_PARM_DESC(io, "I/O base address (default: 0x310)"); | |
991 | ||
992 | module_param(irq, int, S_IRUGO); | |
993 | #ifdef LIRC_IT87_DIGIMATRIX | |
994 | MODULE_PARM_DESC(irq, "Interrupt (1,3-12) (default: 9)"); | |
995 | #else | |
996 | MODULE_PARM_DESC(irq, "Interrupt (1,3-12) (default: 7)"); | |
997 | #endif | |
998 | ||
999 | module_param(it87_enable_demodulator, bool, S_IRUGO); | |
1000 | MODULE_PARM_DESC(it87_enable_demodulator, | |
1001 | "Receiver demodulator enable/disable (1/0), default: 0"); | |
1002 | ||
1003 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
1004 | MODULE_PARM_DESC(debug, "Enable debugging messages"); | |
1005 | ||
1006 | module_param(digimatrix, bool, S_IRUGO | S_IWUSR); | |
1007 | #ifdef LIRC_IT87_DIGIMATRIX | |
1008 | MODULE_PARM_DESC(digimatrix, | |
1009 | "Asus Digimatrix it87 compat. enable/disable (1/0), default: 1"); | |
1010 | #else | |
1011 | MODULE_PARM_DESC(digimatrix, | |
1012 | "Asus Digimatrix it87 compat. enable/disable (1/0), default: 0"); | |
1013 | #endif | |
1014 | ||
1015 | ||
1016 | module_param(it87_freq, int, S_IRUGO); | |
1017 | #ifdef LIRC_IT87_DIGIMATRIX | |
1018 | MODULE_PARM_DESC(it87_freq, | |
1019 | "Carrier demodulator frequency (kHz), (default: 36)"); | |
1020 | #else | |
1021 | MODULE_PARM_DESC(it87_freq, | |
1022 | "Carrier demodulator frequency (kHz), (default: 38)"); | |
1023 | #endif |