1 /*
2 * lirc_serial.c
3 *
4 * lirc_serial - Device driver that records pulse- and pause-lengths
5 * (space-lengths) between DDCD event on a serial port.
6 *
7 * Copyright (C) 1996,97 Ralph Metzler <rjkm@thp.uni-koeln.de>
8 * Copyright (C) 1998 Trent Piepho <xyzzy@u.washington.edu>
9 * Copyright (C) 1998 Ben Pfaff <blp@gnu.org>
10 * Copyright (C) 1999 Christoph Bartelmus <lirc@bartelmus.de>
11 * Copyright (C) 2007 Andrei Tanas <andrei@tanas.ca> (suspend/resume support)
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 */
27
28 /*
29 * Steve's changes to improve transmission fidelity:
30 * - for systems with the rdtsc instruction and the clock counter, a
31 * send_pule that times the pulses directly using the counter.
32 * This means that the LIRC_SERIAL_TRANSMITTER_LATENCY fudge is
33 * not needed. Measurement shows very stable waveform, even where
34 * PCI activity slows the access to the UART, which trips up other
35 * versions.
36 * - For other system, non-integer-microsecond pulse/space lengths,
37 * done using fixed point binary. So, much more accurate carrier
38 * frequency.
39 * - fine tuned transmitter latency, taking advantage of fractional
40 * microseconds in previous change
41 * - Fixed bug in the way transmitter latency was accounted for by
42 * tuning the pulse lengths down - the send_pulse routine ignored
43 * this overhead as it timed the overall pulse length - so the
44 * pulse frequency was right but overall pulse length was too
45 * long. Fixed by accounting for latency on each pulse/space
46 * iteration.
47 *
48 * Steve Davies <steve@daviesfam.org> July 2001
49 */
50
51 #include <linux/module.h>
52 #include <linux/errno.h>
53 #include <linux/signal.h>
54 #include <linux/sched.h>
55 #include <linux/fs.h>
56 #include <linux/interrupt.h>
57 #include <linux/ioport.h>
58 #include <linux/kernel.h>
59 #include <linux/serial_reg.h>
60 #include <linux/time.h>
61 #include <linux/string.h>
62 #include <linux/types.h>
63 #include <linux/wait.h>
64 #include <linux/mm.h>
65 #include <linux/delay.h>
66 #include <linux/poll.h>
67 #include <linux/platform_device.h>
68
69 #include <asm/system.h>
70 #include <linux/io.h>
71 #include <linux/irq.h>
72 #include <linux/fcntl.h>
73 #include <linux/spinlock.h>
74
75 #ifdef CONFIG_LIRC_SERIAL_NSLU2
76 #include <asm/hardware.h>
77 #endif
78 /* From Intel IXP42X Developer's Manual (#252480-005): */
79 /* ftp://download.intel.com/design/network/manuals/25248005.pdf */
80 #define UART_IE_IXP42X_UUE 0x40 /* IXP42X UART Unit enable */
81 #define UART_IE_IXP42X_RTOIE 0x10 /* IXP42X Receiver Data Timeout int.enable */
82
83 #include <media/lirc.h>
84 #include <media/lirc_dev.h>
85
86 #define LIRC_DRIVER_NAME "lirc_serial"
87
88 struct lirc_serial {
89 int signal_pin;
90 int signal_pin_change;
91 u8 on;
92 u8 off;
93 long (*send_pulse)(unsigned long length);
94 void (*send_space)(long length);
95 int features;
96 spinlock_t lock;
97 };
98
99 #define LIRC_HOMEBREW 0
100 #define LIRC_IRDEO 1
101 #define LIRC_IRDEO_REMOTE 2
102 #define LIRC_ANIMAX 3
103 #define LIRC_IGOR 4
104 #define LIRC_NSLU2 5
105
106 /*** module parameters ***/
107 static int type;
108 static int io;
109 static int irq;
110 static bool iommap;
111 static int ioshift;
112 static bool softcarrier = 1;
113 static bool share_irq;
114 static bool debug;
115 static int sense = -1; /* -1 = auto, 0 = active high, 1 = active low */
116 static bool txsense; /* 0 = active high, 1 = active low */
117
118 #define dprintk(fmt, args...) \
119 do { \
120 if (debug) \
121 printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
122 fmt, ## args); \
123 } while (0)
124
125 /* forward declarations */
126 static long send_pulse_irdeo(unsigned long length);
127 static long send_pulse_homebrew(unsigned long length);
128 static void send_space_irdeo(long length);
129 static void send_space_homebrew(long length);
130
131 static struct lirc_serial hardware[] = {
132 [LIRC_HOMEBREW] = {
133 .signal_pin = UART_MSR_DCD,
134 .signal_pin_change = UART_MSR_DDCD,
135 .on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
136 .off = (UART_MCR_RTS | UART_MCR_OUT2),
137 .send_pulse = send_pulse_homebrew,
138 .send_space = send_space_homebrew,
139 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
140 .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
141 LIRC_CAN_SET_SEND_CARRIER |
142 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
143 #else
144 .features = LIRC_CAN_REC_MODE2
145 #endif
146 },
147
148 [LIRC_IRDEO] = {
149 .signal_pin = UART_MSR_DSR,
150 .signal_pin_change = UART_MSR_DDSR,
151 .on = UART_MCR_OUT2,
152 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
153 .send_pulse = send_pulse_irdeo,
154 .send_space = send_space_irdeo,
155 .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
156 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
157 },
158
159 [LIRC_IRDEO_REMOTE] = {
160 .signal_pin = UART_MSR_DSR,
161 .signal_pin_change = UART_MSR_DDSR,
162 .on = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
163 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
164 .send_pulse = send_pulse_irdeo,
165 .send_space = send_space_irdeo,
166 .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
167 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
168 },
169
170 [LIRC_ANIMAX] = {
171 .signal_pin = UART_MSR_DCD,
172 .signal_pin_change = UART_MSR_DDCD,
173 .on = 0,
174 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
175 .send_pulse = NULL,
176 .send_space = NULL,
177 .features = LIRC_CAN_REC_MODE2
178 },
179
180 [LIRC_IGOR] = {
181 .signal_pin = UART_MSR_DSR,
182 .signal_pin_change = UART_MSR_DDSR,
183 .on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
184 .off = (UART_MCR_RTS | UART_MCR_OUT2),
185 .send_pulse = send_pulse_homebrew,
186 .send_space = send_space_homebrew,
187 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
188 .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
189 LIRC_CAN_SET_SEND_CARRIER |
190 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
191 #else
192 .features = LIRC_CAN_REC_MODE2
193 #endif
194 },
195
196 #ifdef CONFIG_LIRC_SERIAL_NSLU2
197 /*
198 * Modified Linksys Network Storage Link USB 2.0 (NSLU2):
199 * We receive on CTS of the 2nd serial port (R142,LHS), we
200 * transmit with a IR diode between GPIO[1] (green status LED),
201 * and ground (Matthias Goebl <matthias.goebl@goebl.net>).
202 * See also http://www.nslu2-linux.org for this device
203 */
204 [LIRC_NSLU2] = {
205 .signal_pin = UART_MSR_CTS,
206 .signal_pin_change = UART_MSR_DCTS,
207 .on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
208 .off = (UART_MCR_RTS | UART_MCR_OUT2),
209 .send_pulse = send_pulse_homebrew,
210 .send_space = send_space_homebrew,
211 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
212 .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
213 LIRC_CAN_SET_SEND_CARRIER |
214 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
215 #else
216 .features = LIRC_CAN_REC_MODE2
217 #endif
218 },
219 #endif
220
221 };
222
223 #define RS_ISR_PASS_LIMIT 256
224
225 /*
226 * A long pulse code from a remote might take up to 300 bytes. The
227 * daemon should read the bytes as soon as they are generated, so take
228 * the number of keys you think you can push before the daemon runs
229 * and multiply by 300. The driver will warn you if you overrun this
230 * buffer. If you have a slow computer or non-busmastering IDE disks,
231 * maybe you will need to increase this.
232 */
233
234 /* This MUST be a power of two! It has to be larger than 1 as well. */
235
236 #define RBUF_LEN 256
237
238 static struct timeval lasttv = {0, 0};
239
240 static struct lirc_buffer rbuf;
241
242 static unsigned int freq = 38000;
243 static unsigned int duty_cycle = 50;
244
245 /* Initialized in init_timing_params() */
246 static unsigned long period;
247 static unsigned long pulse_width;
248 static unsigned long space_width;
249
250 #if defined(__i386__)
251 /*
252 * From:
253 * Linux I/O port programming mini-HOWTO
254 * Author: Riku Saikkonen <Riku.Saikkonen@hut.fi>
255 * v, 28 December 1997
256 *
257 * [...]
258 * Actually, a port I/O instruction on most ports in the 0-0x3ff range
259 * takes almost exactly 1 microsecond, so if you're, for example, using
260 * the parallel port directly, just do additional inb()s from that port
261 * to delay.
262 * [...]
263 */
264 /* transmitter latency 1.5625us 0x1.90 - this figure arrived at from
265 * comment above plus trimming to match actual measured frequency.
266 * This will be sensitive to cpu speed, though hopefully most of the 1.5us
267 * is spent in the uart access. Still - for reference test machine was a
268 * 1.13GHz Athlon system - Steve
269 */
270
271 /*
272 * changed from 400 to 450 as this works better on slower machines;
273 * faster machines will use the rdtsc code anyway
274 */
275 #define LIRC_SERIAL_TRANSMITTER_LATENCY 450
276
277 #else
278
279 /* does anybody have information on other platforms ? */
280 /* 256 = 1<<8 */
281 #define LIRC_SERIAL_TRANSMITTER_LATENCY 256
282
283 #endif /* __i386__ */
284 /*
285 * FIXME: should we be using hrtimers instead of this
286 * LIRC_SERIAL_TRANSMITTER_LATENCY nonsense?
287 */
288
289 /* fetch serial input packet (1 byte) from register offset */
sinp(int offset)290 static u8 sinp(int offset)
291 {
292 if (iommap != 0)
293 /* the register is memory-mapped */
294 offset <<= ioshift;
295
296 return inb(io + offset);
297 }
298
299 /* write serial output packet (1 byte) of value to register offset */
soutp(int offset,u8 value)300 static void soutp(int offset, u8 value)
301 {
302 if (iommap != 0)
303 /* the register is memory-mapped */
304 offset <<= ioshift;
305
306 outb(value, io + offset);
307 }
308
on(void)309 static void on(void)
310 {
311 #ifdef CONFIG_LIRC_SERIAL_NSLU2
312 /*
313 * On NSLU2, we put the transmit diode between the output of the green
314 * status LED and ground
315 */
316 if (type == LIRC_NSLU2) {
317 gpio_line_set(NSLU2_LED_GRN, IXP4XX_GPIO_LOW);
318 return;
319 }
320 #endif
321 if (txsense)
322 soutp(UART_MCR, hardware[type].off);
323 else
324 soutp(UART_MCR, hardware[type].on);
325 }
326
off(void)327 static void off(void)
328 {
329 #ifdef CONFIG_LIRC_SERIAL_NSLU2
330 if (type == LIRC_NSLU2) {
331 gpio_line_set(NSLU2_LED_GRN, IXP4XX_GPIO_HIGH);
332 return;
333 }
334 #endif
335 if (txsense)
336 soutp(UART_MCR, hardware[type].on);
337 else
338 soutp(UART_MCR, hardware[type].off);
339 }
340
341 #ifndef MAX_UDELAY_MS
342 #define MAX_UDELAY_US 5000
343 #else
344 #define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
345 #endif
346
safe_udelay(unsigned long usecs)347 static void safe_udelay(unsigned long usecs)
348 {
349 while (usecs > MAX_UDELAY_US) {
350 udelay(MAX_UDELAY_US);
351 usecs -= MAX_UDELAY_US;
352 }
353 udelay(usecs);
354 }
355
356 #ifdef USE_RDTSC
357 /*
358 * This is an overflow/precision juggle, complicated in that we can't
359 * do long long divide in the kernel
360 */
361
362 /*
363 * When we use the rdtsc instruction to measure clocks, we keep the
364 * pulse and space widths as clock cycles. As this is CPU speed
365 * dependent, the widths must be calculated in init_port and ioctl
366 * time
367 */
368
369 /* So send_pulse can quickly convert microseconds to clocks */
370 static unsigned long conv_us_to_clocks;
371
init_timing_params(unsigned int new_duty_cycle,unsigned int new_freq)372 static int init_timing_params(unsigned int new_duty_cycle,
373 unsigned int new_freq)
374 {
375 __u64 loops_per_sec, work;
376
377 duty_cycle = new_duty_cycle;
378 freq = new_freq;
379
380 loops_per_sec = __this_cpu_read(cpu.info.loops_per_jiffy);
381 loops_per_sec *= HZ;
382
383 /* How many clocks in a microsecond?, avoiding long long divide */
384 work = loops_per_sec;
385 work *= 4295; /* 4295 = 2^32 / 1e6 */
386 conv_us_to_clocks = (work >> 32);
387
388 /*
389 * Carrier period in clocks, approach good up to 32GHz clock,
390 * gets carrier frequency within 8Hz
391 */
392 period = loops_per_sec >> 3;
393 period /= (freq >> 3);
394
395 /* Derive pulse and space from the period */
396 pulse_width = period * duty_cycle / 100;
397 space_width = period - pulse_width;
398 dprintk("in init_timing_params, freq=%d, duty_cycle=%d, "
399 "clk/jiffy=%ld, pulse=%ld, space=%ld, "
400 "conv_us_to_clocks=%ld\n",
401 freq, duty_cycle, __this_cpu_read(cpu_info.loops_per_jiffy),
402 pulse_width, space_width, conv_us_to_clocks);
403 return 0;
404 }
405 #else /* ! USE_RDTSC */
init_timing_params(unsigned int new_duty_cycle,unsigned int new_freq)406 static int init_timing_params(unsigned int new_duty_cycle,
407 unsigned int new_freq)
408 {
409 /*
410 * period, pulse/space width are kept with 8 binary places -
411 * IE multiplied by 256.
412 */
413 if (256 * 1000000L / new_freq * new_duty_cycle / 100 <=
414 LIRC_SERIAL_TRANSMITTER_LATENCY)
415 return -EINVAL;
416 if (256 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
417 LIRC_SERIAL_TRANSMITTER_LATENCY)
418 return -EINVAL;
419 duty_cycle = new_duty_cycle;
420 freq = new_freq;
421 period = 256 * 1000000L / freq;
422 pulse_width = period * duty_cycle / 100;
423 space_width = period - pulse_width;
424 dprintk("in init_timing_params, freq=%d pulse=%ld, "
425 "space=%ld\n", freq, pulse_width, space_width);
426 return 0;
427 }
428 #endif /* USE_RDTSC */
429
430
431 /* return value: space length delta */
432
send_pulse_irdeo(unsigned long length)433 static long send_pulse_irdeo(unsigned long length)
434 {
435 long rawbits, ret;
436 int i;
437 unsigned char output;
438 unsigned char chunk, shifted;
439
440 /* how many bits have to be sent ? */
441 rawbits = length * 1152 / 10000;
442 if (duty_cycle > 50)
443 chunk = 3;
444 else
445 chunk = 1;
446 for (i = 0, output = 0x7f; rawbits > 0; rawbits -= 3) {
447 shifted = chunk << (i * 3);
448 shifted >>= 1;
449 output &= (~shifted);
450 i++;
451 if (i == 3) {
452 soutp(UART_TX, output);
453 while (!(sinp(UART_LSR) & UART_LSR_THRE))
454 ;
455 output = 0x7f;
456 i = 0;
457 }
458 }
459 if (i != 0) {
460 soutp(UART_TX, output);
461 while (!(sinp(UART_LSR) & UART_LSR_TEMT))
462 ;
463 }
464
465 if (i == 0)
466 ret = (-rawbits) * 10000 / 1152;
467 else
468 ret = (3 - i) * 3 * 10000 / 1152 + (-rawbits) * 10000 / 1152;
469
470 return ret;
471 }
472
473 #ifdef USE_RDTSC
474 /* Version that uses Pentium rdtsc instruction to measure clocks */
475
476 /*
477 * This version does sub-microsecond timing using rdtsc instruction,
478 * and does away with the fudged LIRC_SERIAL_TRANSMITTER_LATENCY
479 * Implicitly i586 architecture... - Steve
480 */
481
send_pulse_homebrew_softcarrier(unsigned long length)482 static long send_pulse_homebrew_softcarrier(unsigned long length)
483 {
484 int flag;
485 unsigned long target, start, now;
486
487 /* Get going quick as we can */
488 rdtscl(start);
489 on();
490 /* Convert length from microseconds to clocks */
491 length *= conv_us_to_clocks;
492 /* And loop till time is up - flipping at right intervals */
493 now = start;
494 target = pulse_width;
495 flag = 1;
496 /*
497 * FIXME: This looks like a hard busy wait, without even an occasional,
498 * polite, cpu_relax() call. There's got to be a better way?
499 *
500 * The i2c code has the result of a lot of bit-banging work, I wonder if
501 * there's something there which could be helpful here.
502 */
503 while ((now - start) < length) {
504 /* Delay till flip time */
505 do {
506 rdtscl(now);
507 } while ((now - start) < target);
508
509 /* flip */
510 if (flag) {
511 rdtscl(now);
512 off();
513 target += space_width;
514 } else {
515 rdtscl(now); on();
516 target += pulse_width;
517 }
518 flag = !flag;
519 }
520 rdtscl(now);
521 return ((now - start) - length) / conv_us_to_clocks;
522 }
523 #else /* ! USE_RDTSC */
524 /* Version using udelay() */
525
526 /*
527 * here we use fixed point arithmetic, with 8
528 * fractional bits. that gets us within 0.1% or so of the right average
529 * frequency, albeit with some jitter in pulse length - Steve
530 */
531
532 /* To match 8 fractional bits used for pulse/space length */
533
send_pulse_homebrew_softcarrier(unsigned long length)534 static long send_pulse_homebrew_softcarrier(unsigned long length)
535 {
536 int flag;
537 unsigned long actual, target, d;
538 length <<= 8;
539
540 actual = 0; target = 0; flag = 0;
541 while (actual < length) {
542 if (flag) {
543 off();
544 target += space_width;
545 } else {
546 on();
547 target += pulse_width;
548 }
549 d = (target - actual -
550 LIRC_SERIAL_TRANSMITTER_LATENCY + 128) >> 8;
551 /*
552 * Note - we've checked in ioctl that the pulse/space
553 * widths are big enough so that d is > 0
554 */
555 udelay(d);
556 actual += (d << 8) + LIRC_SERIAL_TRANSMITTER_LATENCY;
557 flag = !flag;
558 }
559 return (actual-length) >> 8;
560 }
561 #endif /* USE_RDTSC */
562
send_pulse_homebrew(unsigned long length)563 static long send_pulse_homebrew(unsigned long length)
564 {
565 if (length <= 0)
566 return 0;
567
568 if (softcarrier)
569 return send_pulse_homebrew_softcarrier(length);
570 else {
571 on();
572 safe_udelay(length);
573 return 0;
574 }
575 }
576
send_space_irdeo(long length)577 static void send_space_irdeo(long length)
578 {
579 if (length <= 0)
580 return;
581
582 safe_udelay(length);
583 }
584
send_space_homebrew(long length)585 static void send_space_homebrew(long length)
586 {
587 off();
588 if (length <= 0)
589 return;
590 safe_udelay(length);
591 }
592
rbwrite(int l)593 static void rbwrite(int l)
594 {
595 if (lirc_buffer_full(&rbuf)) {
596 /* no new signals will be accepted */
597 dprintk("Buffer overrun\n");
598 return;
599 }
600 lirc_buffer_write(&rbuf, (void *)&l);
601 }
602
frbwrite(int l)603 static void frbwrite(int l)
604 {
605 /* simple noise filter */
606 static int pulse, space;
607 static unsigned int ptr;
608
609 if (ptr > 0 && (l & PULSE_BIT)) {
610 pulse += l & PULSE_MASK;
611 if (pulse > 250) {
612 rbwrite(space);
613 rbwrite(pulse | PULSE_BIT);
614 ptr = 0;
615 pulse = 0;
616 }
617 return;
618 }
619 if (!(l & PULSE_BIT)) {
620 if (ptr == 0) {
621 if (l > 20000) {
622 space = l;
623 ptr++;
624 return;
625 }
626 } else {
627 if (l > 20000) {
628 space += pulse;
629 if (space > PULSE_MASK)
630 space = PULSE_MASK;
631 space += l;
632 if (space > PULSE_MASK)
633 space = PULSE_MASK;
634 pulse = 0;
635 return;
636 }
637 rbwrite(space);
638 rbwrite(pulse | PULSE_BIT);
639 ptr = 0;
640 pulse = 0;
641 }
642 }
643 rbwrite(l);
644 }
645
irq_handler(int i,void * blah)646 static irqreturn_t irq_handler(int i, void *blah)
647 {
648 struct timeval tv;
649 int counter, dcd;
650 u8 status;
651 long deltv;
652 int data;
653 static int last_dcd = -1;
654
655 if ((sinp(UART_IIR) & UART_IIR_NO_INT)) {
656 /* not our interrupt */
657 return IRQ_NONE;
658 }
659
660 counter = 0;
661 do {
662 counter++;
663 status = sinp(UART_MSR);
664 if (counter > RS_ISR_PASS_LIMIT) {
665 printk(KERN_WARNING LIRC_DRIVER_NAME ": AIEEEE: "
666 "We're caught!\n");
667 break;
668 }
669 if ((status & hardware[type].signal_pin_change)
670 && sense != -1) {
671 /* get current time */
672 do_gettimeofday(&tv);
673
674 /* New mode, written by Trent Piepho
675 <xyzzy@u.washington.edu>. */
676
677 /*
678 * The old format was not very portable.
679 * We now use an int to pass pulses
680 * and spaces to user space.
681 *
682 * If PULSE_BIT is set a pulse has been
683 * received, otherwise a space has been
684 * received. The driver needs to know if your
685 * receiver is active high or active low, or
686 * the space/pulse sense could be
687 * inverted. The bits denoted by PULSE_MASK are
688 * the length in microseconds. Lengths greater
689 * than or equal to 16 seconds are clamped to
690 * PULSE_MASK. All other bits are unused.
691 * This is a much simpler interface for user
692 * programs, as well as eliminating "out of
693 * phase" errors with space/pulse
694 * autodetection.
695 */
696
697 /* calc time since last interrupt in microseconds */
698 dcd = (status & hardware[type].signal_pin) ? 1 : 0;
699
700 if (dcd == last_dcd) {
701 printk(KERN_WARNING LIRC_DRIVER_NAME
702 ": ignoring spike: %d %d %lx %lx %lx %lx\n",
703 dcd, sense,
704 tv.tv_sec, lasttv.tv_sec,
705 tv.tv_usec, lasttv.tv_usec);
706 continue;
707 }
708
709 deltv = tv.tv_sec-lasttv.tv_sec;
710 if (tv.tv_sec < lasttv.tv_sec ||
711 (tv.tv_sec == lasttv.tv_sec &&
712 tv.tv_usec < lasttv.tv_usec)) {
713 printk(KERN_WARNING LIRC_DRIVER_NAME
714 ": AIEEEE: your clock just jumped "
715 "backwards\n");
716 printk(KERN_WARNING LIRC_DRIVER_NAME
717 ": %d %d %lx %lx %lx %lx\n",
718 dcd, sense,
719 tv.tv_sec, lasttv.tv_sec,
720 tv.tv_usec, lasttv.tv_usec);
721 data = PULSE_MASK;
722 } else if (deltv > 15) {
723 data = PULSE_MASK; /* really long time */
724 if (!(dcd^sense)) {
725 /* sanity check */
726 printk(KERN_WARNING LIRC_DRIVER_NAME
727 ": AIEEEE: "
728 "%d %d %lx %lx %lx %lx\n",
729 dcd, sense,
730 tv.tv_sec, lasttv.tv_sec,
731 tv.tv_usec, lasttv.tv_usec);
732 /*
733 * detecting pulse while this
734 * MUST be a space!
735 */
736 sense = sense ? 0 : 1;
737 }
738 } else
739 data = (int) (deltv*1000000 +
740 tv.tv_usec -
741 lasttv.tv_usec);
742 frbwrite(dcd^sense ? data : (data|PULSE_BIT));
743 lasttv = tv;
744 last_dcd = dcd;
745 wake_up_interruptible(&rbuf.wait_poll);
746 }
747 } while (!(sinp(UART_IIR) & UART_IIR_NO_INT)); /* still pending ? */
748 return IRQ_HANDLED;
749 }
750
751
hardware_init_port(void)752 static int hardware_init_port(void)
753 {
754 u8 scratch, scratch2, scratch3;
755
756 /*
757 * This is a simple port existence test, borrowed from the autoconfig
758 * function in drivers/serial/8250.c
759 */
760 scratch = sinp(UART_IER);
761 soutp(UART_IER, 0);
762 #ifdef __i386__
763 outb(0xff, 0x080);
764 #endif
765 scratch2 = sinp(UART_IER) & 0x0f;
766 soutp(UART_IER, 0x0f);
767 #ifdef __i386__
768 outb(0x00, 0x080);
769 #endif
770 scratch3 = sinp(UART_IER) & 0x0f;
771 soutp(UART_IER, scratch);
772 if (scratch2 != 0 || scratch3 != 0x0f) {
773 /* we fail, there's nothing here */
774 printk(KERN_ERR LIRC_DRIVER_NAME ": port existence test "
775 "failed, cannot continue\n");
776 return -ENODEV;
777 }
778
779
780
781 /* Set DLAB 0. */
782 soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
783
784 /* First of all, disable all interrupts */
785 soutp(UART_IER, sinp(UART_IER) &
786 (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
787
788 /* Clear registers. */
789 sinp(UART_LSR);
790 sinp(UART_RX);
791 sinp(UART_IIR);
792 sinp(UART_MSR);
793
794 #ifdef CONFIG_LIRC_SERIAL_NSLU2
795 if (type == LIRC_NSLU2) {
796 /* Setup NSLU2 UART */
797
798 /* Enable UART */
799 soutp(UART_IER, sinp(UART_IER) | UART_IE_IXP42X_UUE);
800 /* Disable Receiver data Time out interrupt */
801 soutp(UART_IER, sinp(UART_IER) & ~UART_IE_IXP42X_RTOIE);
802 /* set out2 = interrupt unmask; off() doesn't set MCR
803 on NSLU2 */
804 soutp(UART_MCR, UART_MCR_RTS|UART_MCR_OUT2);
805 }
806 #endif
807
808 /* Set line for power source */
809 off();
810
811 /* Clear registers again to be sure. */
812 sinp(UART_LSR);
813 sinp(UART_RX);
814 sinp(UART_IIR);
815 sinp(UART_MSR);
816
817 switch (type) {
818 case LIRC_IRDEO:
819 case LIRC_IRDEO_REMOTE:
820 /* setup port to 7N1 @ 115200 Baud */
821 /* 7N1+start = 9 bits at 115200 ~ 3 bits at 38kHz */
822
823 /* Set DLAB 1. */
824 soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
825 /* Set divisor to 1 => 115200 Baud */
826 soutp(UART_DLM, 0);
827 soutp(UART_DLL, 1);
828 /* Set DLAB 0 + 7N1 */
829 soutp(UART_LCR, UART_LCR_WLEN7);
830 /* THR interrupt already disabled at this point */
831 break;
832 default:
833 break;
834 }
835
836 return 0;
837 }
838
lirc_serial_probe(struct platform_device * dev)839 static int __devinit lirc_serial_probe(struct platform_device *dev)
840 {
841 int i, nlow, nhigh, result;
842
843 result = request_irq(irq, irq_handler,
844 (share_irq ? IRQF_SHARED : 0),
845 LIRC_DRIVER_NAME, (void *)&hardware);
846 if (result < 0) {
847 if (result == -EBUSY)
848 printk(KERN_ERR LIRC_DRIVER_NAME ": IRQ %d busy\n",
849 irq);
850 else if (result == -EINVAL)
851 printk(KERN_ERR LIRC_DRIVER_NAME
852 ": Bad irq number or handler\n");
853 return result;
854 }
855
856 /* Reserve io region. */
857 /*
858 * Future MMAP-Developers: Attention!
859 * For memory mapped I/O you *might* need to use ioremap() first,
860 * for the NSLU2 it's done in boot code.
861 */
862 if (((iommap != 0)
863 && (request_mem_region(iommap, 8 << ioshift,
864 LIRC_DRIVER_NAME) == NULL))
865 || ((iommap == 0)
866 && (request_region(io, 8, LIRC_DRIVER_NAME) == NULL))) {
867 printk(KERN_ERR LIRC_DRIVER_NAME
868 ": port %04x already in use\n", io);
869 printk(KERN_WARNING LIRC_DRIVER_NAME
870 ": use 'setserial /dev/ttySX uart none'\n");
871 printk(KERN_WARNING LIRC_DRIVER_NAME
872 ": or compile the serial port driver as module and\n");
873 printk(KERN_WARNING LIRC_DRIVER_NAME
874 ": make sure this module is loaded first\n");
875 result = -EBUSY;
876 goto exit_free_irq;
877 }
878
879 result = hardware_init_port();
880 if (result < 0)
881 goto exit_release_region;
882
883 /* Initialize pulse/space widths */
884 init_timing_params(duty_cycle, freq);
885
886 /* If pin is high, then this must be an active low receiver. */
887 if (sense == -1) {
888 /* wait 1/2 sec for the power supply */
889 msleep(500);
890
891 /*
892 * probe 9 times every 0.04s, collect "votes" for
893 * active high/low
894 */
895 nlow = 0;
896 nhigh = 0;
897 for (i = 0; i < 9; i++) {
898 if (sinp(UART_MSR) & hardware[type].signal_pin)
899 nlow++;
900 else
901 nhigh++;
902 msleep(40);
903 }
904 sense = (nlow >= nhigh ? 1 : 0);
905 printk(KERN_INFO LIRC_DRIVER_NAME ": auto-detected active "
906 "%s receiver\n", sense ? "low" : "high");
907 } else
908 printk(KERN_INFO LIRC_DRIVER_NAME ": Manually using active "
909 "%s receiver\n", sense ? "low" : "high");
910
911 dprintk("Interrupt %d, port %04x obtained\n", irq, io);
912 return 0;
913
914 exit_release_region:
915 if (iommap != 0)
916 release_mem_region(iommap, 8 << ioshift);
917 else
918 release_region(io, 8);
919 exit_free_irq:
920 free_irq(irq, (void *)&hardware);
921
922 return result;
923 }
924
lirc_serial_remove(struct platform_device * dev)925 static int __devexit lirc_serial_remove(struct platform_device *dev)
926 {
927 free_irq(irq, (void *)&hardware);
928
929 if (iommap != 0)
930 release_mem_region(iommap, 8 << ioshift);
931 else
932 release_region(io, 8);
933
934 return 0;
935 }
936
set_use_inc(void * data)937 static int set_use_inc(void *data)
938 {
939 unsigned long flags;
940
941 /* initialize timestamp */
942 do_gettimeofday(&lasttv);
943
944 spin_lock_irqsave(&hardware[type].lock, flags);
945
946 /* Set DLAB 0. */
947 soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
948
949 soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
950
951 spin_unlock_irqrestore(&hardware[type].lock, flags);
952
953 return 0;
954 }
955
set_use_dec(void * data)956 static void set_use_dec(void *data)
957 { unsigned long flags;
958
959 spin_lock_irqsave(&hardware[type].lock, flags);
960
961 /* Set DLAB 0. */
962 soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
963
964 /* First of all, disable all interrupts */
965 soutp(UART_IER, sinp(UART_IER) &
966 (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
967 spin_unlock_irqrestore(&hardware[type].lock, flags);
968 }
969
lirc_write(struct file * file,const char * buf,size_t n,loff_t * ppos)970 static ssize_t lirc_write(struct file *file, const char *buf,
971 size_t n, loff_t *ppos)
972 {
973 int i, count;
974 unsigned long flags;
975 long delta = 0;
976 int *wbuf;
977
978 if (!(hardware[type].features & LIRC_CAN_SEND_PULSE))
979 return -EPERM;
980
981 count = n / sizeof(int);
982 if (n % sizeof(int) || count % 2 == 0)
983 return -EINVAL;
984 wbuf = memdup_user(buf, n);
985 if (IS_ERR(wbuf))
986 return PTR_ERR(wbuf);
987 spin_lock_irqsave(&hardware[type].lock, flags);
988 if (type == LIRC_IRDEO) {
989 /* DTR, RTS down */
990 on();
991 }
992 for (i = 0; i < count; i++) {
993 if (i%2)
994 hardware[type].send_space(wbuf[i] - delta);
995 else
996 delta = hardware[type].send_pulse(wbuf[i]);
997 }
998 off();
999 spin_unlock_irqrestore(&hardware[type].lock, flags);
1000 kfree(wbuf);
1001 return n;
1002 }
1003
lirc_ioctl(struct file * filep,unsigned int cmd,unsigned long arg)1004 static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
1005 {
1006 int result;
1007 __u32 value;
1008
1009 switch (cmd) {
1010 case LIRC_GET_SEND_MODE:
1011 if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
1012 return -ENOIOCTLCMD;
1013
1014 result = put_user(LIRC_SEND2MODE
1015 (hardware[type].features&LIRC_CAN_SEND_MASK),
1016 (__u32 *) arg);
1017 if (result)
1018 return result;
1019 break;
1020
1021 case LIRC_SET_SEND_MODE:
1022 if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
1023 return -ENOIOCTLCMD;
1024
1025 result = get_user(value, (__u32 *) arg);
1026 if (result)
1027 return result;
1028 /* only LIRC_MODE_PULSE supported */
1029 if (value != LIRC_MODE_PULSE)
1030 return -EINVAL;
1031 break;
1032
1033 case LIRC_GET_LENGTH:
1034 return -ENOIOCTLCMD;
1035 break;
1036
1037 case LIRC_SET_SEND_DUTY_CYCLE:
1038 dprintk("SET_SEND_DUTY_CYCLE\n");
1039 if (!(hardware[type].features&LIRC_CAN_SET_SEND_DUTY_CYCLE))
1040 return -ENOIOCTLCMD;
1041
1042 result = get_user(value, (__u32 *) arg);
1043 if (result)
1044 return result;
1045 if (value <= 0 || value > 100)
1046 return -EINVAL;
1047 return init_timing_params(value, freq);
1048 break;
1049
1050 case LIRC_SET_SEND_CARRIER:
1051 dprintk("SET_SEND_CARRIER\n");
1052 if (!(hardware[type].features&LIRC_CAN_SET_SEND_CARRIER))
1053 return -ENOIOCTLCMD;
1054
1055 result = get_user(value, (__u32 *) arg);
1056 if (result)
1057 return result;
1058 if (value > 500000 || value < 20000)
1059 return -EINVAL;
1060 return init_timing_params(duty_cycle, value);
1061 break;
1062
1063 default:
1064 return lirc_dev_fop_ioctl(filep, cmd, arg);
1065 }
1066 return 0;
1067 }
1068
1069 static const struct file_operations lirc_fops = {
1070 .owner = THIS_MODULE,
1071 .write = lirc_write,
1072 .unlocked_ioctl = lirc_ioctl,
1073 #ifdef CONFIG_COMPAT
1074 .compat_ioctl = lirc_ioctl,
1075 #endif
1076 .read = lirc_dev_fop_read,
1077 .poll = lirc_dev_fop_poll,
1078 .open = lirc_dev_fop_open,
1079 .release = lirc_dev_fop_close,
1080 .llseek = no_llseek,
1081 };
1082
1083 static struct lirc_driver driver = {
1084 .name = LIRC_DRIVER_NAME,
1085 .minor = -1,
1086 .code_length = 1,
1087 .sample_rate = 0,
1088 .data = NULL,
1089 .add_to_buf = NULL,
1090 .rbuf = &rbuf,
1091 .set_use_inc = set_use_inc,
1092 .set_use_dec = set_use_dec,
1093 .fops = &lirc_fops,
1094 .dev = NULL,
1095 .owner = THIS_MODULE,
1096 };
1097
1098 static struct platform_device *lirc_serial_dev;
1099
lirc_serial_suspend(struct platform_device * dev,pm_message_t state)1100 static int lirc_serial_suspend(struct platform_device *dev,
1101 pm_message_t state)
1102 {
1103 /* Set DLAB 0. */
1104 soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
1105
1106 /* Disable all interrupts */
1107 soutp(UART_IER, sinp(UART_IER) &
1108 (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
1109
1110 /* Clear registers. */
1111 sinp(UART_LSR);
1112 sinp(UART_RX);
1113 sinp(UART_IIR);
1114 sinp(UART_MSR);
1115
1116 return 0;
1117 }
1118
1119 /* twisty maze... need a forward-declaration here... */
1120 static void lirc_serial_exit(void);
1121
lirc_serial_resume(struct platform_device * dev)1122 static int lirc_serial_resume(struct platform_device *dev)
1123 {
1124 unsigned long flags;
1125 int result;
1126
1127 result = hardware_init_port();
1128 if (result < 0)
1129 return result;
1130
1131 spin_lock_irqsave(&hardware[type].lock, flags);
1132 /* Enable Interrupt */
1133 do_gettimeofday(&lasttv);
1134 soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
1135 off();
1136
1137 lirc_buffer_clear(&rbuf);
1138
1139 spin_unlock_irqrestore(&hardware[type].lock, flags);
1140
1141 return 0;
1142 }
1143
1144 static struct platform_driver lirc_serial_driver = {
1145 .probe = lirc_serial_probe,
1146 .remove = __devexit_p(lirc_serial_remove),
1147 .suspend = lirc_serial_suspend,
1148 .resume = lirc_serial_resume,
1149 .driver = {
1150 .name = "lirc_serial",
1151 .owner = THIS_MODULE,
1152 },
1153 };
1154
lirc_serial_init(void)1155 static int __init lirc_serial_init(void)
1156 {
1157 int result;
1158
1159 /* Init read buffer. */
1160 result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
1161 if (result < 0)
1162 return result;
1163
1164 result = platform_driver_register(&lirc_serial_driver);
1165 if (result) {
1166 printk("lirc register returned %d\n", result);
1167 goto exit_buffer_free;
1168 }
1169
1170 lirc_serial_dev = platform_device_alloc("lirc_serial", 0);
1171 if (!lirc_serial_dev) {
1172 result = -ENOMEM;
1173 goto exit_driver_unregister;
1174 }
1175
1176 result = platform_device_add(lirc_serial_dev);
1177 if (result)
1178 goto exit_device_put;
1179
1180 return 0;
1181
1182 exit_device_put:
1183 platform_device_put(lirc_serial_dev);
1184 exit_driver_unregister:
1185 platform_driver_unregister(&lirc_serial_driver);
1186 exit_buffer_free:
1187 lirc_buffer_free(&rbuf);
1188 return result;
1189 }
1190
lirc_serial_exit(void)1191 static void lirc_serial_exit(void)
1192 {
1193 platform_device_unregister(lirc_serial_dev);
1194 platform_driver_unregister(&lirc_serial_driver);
1195 lirc_buffer_free(&rbuf);
1196 }
1197
lirc_serial_init_module(void)1198 static int __init lirc_serial_init_module(void)
1199 {
1200 int result;
1201
1202 switch (type) {
1203 case LIRC_HOMEBREW:
1204 case LIRC_IRDEO:
1205 case LIRC_IRDEO_REMOTE:
1206 case LIRC_ANIMAX:
1207 case LIRC_IGOR:
1208 /* if nothing specified, use ttyS0/com1 and irq 4 */
1209 io = io ? io : 0x3f8;
1210 irq = irq ? irq : 4;
1211 break;
1212 #ifdef CONFIG_LIRC_SERIAL_NSLU2
1213 case LIRC_NSLU2:
1214 io = io ? io : IRQ_IXP4XX_UART2;
1215 irq = irq ? irq : (IXP4XX_UART2_BASE_VIRT + REG_OFFSET);
1216 iommap = iommap ? iommap : IXP4XX_UART2_BASE_PHYS;
1217 ioshift = ioshift ? ioshift : 2;
1218 break;
1219 #endif
1220 default:
1221 return -EINVAL;
1222 }
1223 if (!softcarrier) {
1224 switch (type) {
1225 case LIRC_HOMEBREW:
1226 case LIRC_IGOR:
1227 #ifdef CONFIG_LIRC_SERIAL_NSLU2
1228 case LIRC_NSLU2:
1229 #endif
1230 hardware[type].features &=
1231 ~(LIRC_CAN_SET_SEND_DUTY_CYCLE|
1232 LIRC_CAN_SET_SEND_CARRIER);
1233 break;
1234 }
1235 }
1236
1237 result = lirc_serial_init();
1238 if (result)
1239 return result;
1240
1241 driver.features = hardware[type].features;
1242 driver.dev = &lirc_serial_dev->dev;
1243 driver.minor = lirc_register_driver(&driver);
1244 if (driver.minor < 0) {
1245 printk(KERN_ERR LIRC_DRIVER_NAME
1246 ": register_chrdev failed!\n");
1247 lirc_serial_exit();
1248 return driver.minor;
1249 }
1250 return 0;
1251 }
1252
lirc_serial_exit_module(void)1253 static void __exit lirc_serial_exit_module(void)
1254 {
1255 lirc_unregister_driver(driver.minor);
1256 lirc_serial_exit();
1257 dprintk("cleaned up module\n");
1258 }
1259
1260
1261 module_init(lirc_serial_init_module);
1262 module_exit(lirc_serial_exit_module);
1263
1264 MODULE_DESCRIPTION("Infra-red receiver driver for serial ports.");
1265 MODULE_AUTHOR("Ralph Metzler, Trent Piepho, Ben Pfaff, "
1266 "Christoph Bartelmus, Andrei Tanas");
1267 MODULE_LICENSE("GPL");
1268
1269 module_param(type, int, S_IRUGO);
1270 MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo,"
1271 " 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug,"
1272 " 5 = NSLU2 RX:CTS2/TX:GreenLED)");
1273
1274 module_param(io, int, S_IRUGO);
1275 MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
1276
1277 /* some architectures (e.g. intel xscale) have memory mapped registers */
1278 module_param(iommap, bool, S_IRUGO);
1279 MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O"
1280 " (0 = no memory mapped io)");
1281
1282 /*
1283 * some architectures (e.g. intel xscale) align the 8bit serial registers
1284 * on 32bit word boundaries.
1285 * See linux-kernel/serial/8250.c serial_in()/out()
1286 */
1287 module_param(ioshift, int, S_IRUGO);
1288 MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");
1289
1290 module_param(irq, int, S_IRUGO);
1291 MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
1292
1293 module_param(share_irq, bool, S_IRUGO);
1294 MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)");
1295
1296 module_param(sense, bool, S_IRUGO);
1297 MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
1298 " (0 = active high, 1 = active low )");
1299
1300 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
1301 module_param(txsense, bool, S_IRUGO);
1302 MODULE_PARM_DESC(txsense, "Sense of transmitter circuit"
1303 " (0 = active high, 1 = active low )");
1304 #endif
1305
1306 module_param(softcarrier, bool, S_IRUGO);
1307 MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
1308
1309 module_param(debug, bool, S_IRUGO | S_IWUSR);
1310 MODULE_PARM_DESC(debug, "Enable debugging messages");
1311