4 * lirc_serial - Device driver that records pulse- and pause-lengths
5 * (space-lengths) between DDCD event on a serial port.
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.
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.
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
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
36 * - For other system, non-integer-microsecond pulse/space lengths,
37 * done using fixed point binary. So, much more accurate carrier
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
48 * Steve Davies <steve@daviesfam.org> July 2001
51 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
53 #include <linux/module.h>
54 #include <linux/errno.h>
55 #include <linux/signal.h>
56 #include <linux/sched.h>
58 #include <linux/interrupt.h>
59 #include <linux/ioport.h>
60 #include <linux/kernel.h>
61 #include <linux/serial_reg.h>
62 #include <linux/time.h>
63 #include <linux/string.h>
64 #include <linux/types.h>
65 #include <linux/wait.h>
67 #include <linux/delay.h>
68 #include <linux/poll.h>
69 #include <linux/platform_device.h>
70 #include <linux/gpio.h>
72 #include <linux/irq.h>
73 #include <linux/fcntl.h>
74 #include <linux/spinlock.h>
76 /* From Intel IXP42X Developer's Manual (#252480-005): */
77 /* ftp://download.intel.com/design/network/manuals/25248005.pdf */
78 #define UART_IE_IXP42X_UUE 0x40 /* IXP42X UART Unit enable */
79 #define UART_IE_IXP42X_RTOIE 0x10 /* IXP42X Receiver Data Timeout int.enable */
81 #include <media/lirc.h>
82 #include <media/lirc_dev.h>
84 #define LIRC_DRIVER_NAME "lirc_serial"
88 int signal_pin_change;
91 long (*send_pulse)(unsigned long length);
92 void (*send_space)(long length);
97 #define LIRC_HOMEBREW 0
99 #define LIRC_IRDEO_REMOTE 2
100 #define LIRC_ANIMAX 3
104 /*** module parameters ***/
110 static bool softcarrier = 1;
111 static bool share_irq;
113 static int sense = -1; /* -1 = auto, 0 = active high, 1 = active low */
114 static bool txsense; /* 0 = active high, 1 = active low */
116 #define dprintk(fmt, args...) \
119 printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
123 /* forward declarations */
124 static long send_pulse_irdeo(unsigned long length);
125 static long send_pulse_homebrew(unsigned long length);
126 static void send_space_irdeo(long length);
127 static void send_space_homebrew(long length);
129 static struct lirc_serial hardware[] = {
131 .lock = __SPIN_LOCK_UNLOCKED(hardware[LIRC_HOMEBREW].lock),
132 .signal_pin = UART_MSR_DCD,
133 .signal_pin_change = UART_MSR_DDCD,
134 .on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
135 .off = (UART_MCR_RTS | UART_MCR_OUT2),
136 .send_pulse = send_pulse_homebrew,
137 .send_space = send_space_homebrew,
138 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
139 .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
140 LIRC_CAN_SET_SEND_CARRIER |
141 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
143 .features = LIRC_CAN_REC_MODE2
148 .lock = __SPIN_LOCK_UNLOCKED(hardware[LIRC_IRDEO].lock),
149 .signal_pin = UART_MSR_DSR,
150 .signal_pin_change = UART_MSR_DDSR,
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)
159 [LIRC_IRDEO_REMOTE] = {
160 .lock = __SPIN_LOCK_UNLOCKED(hardware[LIRC_IRDEO_REMOTE].lock),
161 .signal_pin = UART_MSR_DSR,
162 .signal_pin_change = UART_MSR_DDSR,
163 .on = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
164 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
165 .send_pulse = send_pulse_irdeo,
166 .send_space = send_space_irdeo,
167 .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
168 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
172 .lock = __SPIN_LOCK_UNLOCKED(hardware[LIRC_ANIMAX].lock),
173 .signal_pin = UART_MSR_DCD,
174 .signal_pin_change = UART_MSR_DDCD,
176 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
179 .features = LIRC_CAN_REC_MODE2
183 .lock = __SPIN_LOCK_UNLOCKED(hardware[LIRC_IGOR].lock),
184 .signal_pin = UART_MSR_DSR,
185 .signal_pin_change = UART_MSR_DDSR,
186 .on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
187 .off = (UART_MCR_RTS | UART_MCR_OUT2),
188 .send_pulse = send_pulse_homebrew,
189 .send_space = send_space_homebrew,
190 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
191 .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
192 LIRC_CAN_SET_SEND_CARRIER |
193 LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
195 .features = LIRC_CAN_REC_MODE2
200 #define RS_ISR_PASS_LIMIT 256
203 * A long pulse code from a remote might take up to 300 bytes. The
204 * daemon should read the bytes as soon as they are generated, so take
205 * the number of keys you think you can push before the daemon runs
206 * and multiply by 300. The driver will warn you if you overrun this
207 * buffer. If you have a slow computer or non-busmastering IDE disks,
208 * maybe you will need to increase this.
211 /* This MUST be a power of two! It has to be larger than 1 as well. */
215 static struct timeval lasttv = {0, 0};
217 static struct lirc_buffer rbuf;
219 static unsigned int freq = 38000;
220 static unsigned int duty_cycle = 50;
222 /* Initialized in init_timing_params() */
223 static unsigned long period;
224 static unsigned long pulse_width;
225 static unsigned long space_width;
227 #if defined(__i386__)
230 * Linux I/O port programming mini-HOWTO
231 * Author: Riku Saikkonen <Riku.Saikkonen@hut.fi>
232 * v, 28 December 1997
235 * Actually, a port I/O instruction on most ports in the 0-0x3ff range
236 * takes almost exactly 1 microsecond, so if you're, for example, using
237 * the parallel port directly, just do additional inb()s from that port
241 /* transmitter latency 1.5625us 0x1.90 - this figure arrived at from
242 * comment above plus trimming to match actual measured frequency.
243 * This will be sensitive to cpu speed, though hopefully most of the 1.5us
244 * is spent in the uart access. Still - for reference test machine was a
245 * 1.13GHz Athlon system - Steve
249 * changed from 400 to 450 as this works better on slower machines;
250 * faster machines will use the rdtsc code anyway
252 #define LIRC_SERIAL_TRANSMITTER_LATENCY 450
256 /* does anybody have information on other platforms ? */
258 #define LIRC_SERIAL_TRANSMITTER_LATENCY 256
260 #endif /* __i386__ */
262 * FIXME: should we be using hrtimers instead of this
263 * LIRC_SERIAL_TRANSMITTER_LATENCY nonsense?
266 /* fetch serial input packet (1 byte) from register offset */
267 static u8 sinp(int offset)
270 /* the register is memory-mapped */
273 return inb(io + offset);
276 /* write serial output packet (1 byte) of value to register offset */
277 static void soutp(int offset, u8 value)
280 /* the register is memory-mapped */
283 outb(value, io + offset);
289 soutp(UART_MCR, hardware[type].off);
291 soutp(UART_MCR, hardware[type].on);
294 static void off(void)
297 soutp(UART_MCR, hardware[type].on);
299 soutp(UART_MCR, hardware[type].off);
302 #ifndef MAX_UDELAY_MS
303 #define MAX_UDELAY_US 5000
305 #define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
308 static void safe_udelay(unsigned long usecs)
310 while (usecs > MAX_UDELAY_US) {
311 udelay(MAX_UDELAY_US);
312 usecs -= MAX_UDELAY_US;
319 * This is an overflow/precision juggle, complicated in that we can't
320 * do long long divide in the kernel
324 * When we use the rdtsc instruction to measure clocks, we keep the
325 * pulse and space widths as clock cycles. As this is CPU speed
326 * dependent, the widths must be calculated in init_port and ioctl
330 /* So send_pulse can quickly convert microseconds to clocks */
331 static unsigned long conv_us_to_clocks;
333 static int init_timing_params(unsigned int new_duty_cycle,
334 unsigned int new_freq)
336 __u64 loops_per_sec, work;
338 duty_cycle = new_duty_cycle;
341 loops_per_sec = __this_cpu_read(cpu.info.loops_per_jiffy);
344 /* How many clocks in a microsecond?, avoiding long long divide */
345 work = loops_per_sec;
346 work *= 4295; /* 4295 = 2^32 / 1e6 */
347 conv_us_to_clocks = (work >> 32);
350 * Carrier period in clocks, approach good up to 32GHz clock,
351 * gets carrier frequency within 8Hz
353 period = loops_per_sec >> 3;
354 period /= (freq >> 3);
356 /* Derive pulse and space from the period */
357 pulse_width = period * duty_cycle / 100;
358 space_width = period - pulse_width;
359 dprintk("in init_timing_params, freq=%d, duty_cycle=%d, "
360 "clk/jiffy=%ld, pulse=%ld, space=%ld, "
361 "conv_us_to_clocks=%ld\n",
362 freq, duty_cycle, __this_cpu_read(cpu_info.loops_per_jiffy),
363 pulse_width, space_width, conv_us_to_clocks);
366 #else /* ! USE_RDTSC */
367 static int init_timing_params(unsigned int new_duty_cycle,
368 unsigned int new_freq)
371 * period, pulse/space width are kept with 8 binary places -
372 * IE multiplied by 256.
374 if (256 * 1000000L / new_freq * new_duty_cycle / 100 <=
375 LIRC_SERIAL_TRANSMITTER_LATENCY)
377 if (256 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
378 LIRC_SERIAL_TRANSMITTER_LATENCY)
380 duty_cycle = new_duty_cycle;
382 period = 256 * 1000000L / freq;
383 pulse_width = period * duty_cycle / 100;
384 space_width = period - pulse_width;
385 dprintk("in init_timing_params, freq=%d pulse=%ld, space=%ld\n",
386 freq, pulse_width, space_width);
389 #endif /* USE_RDTSC */
392 /* return value: space length delta */
394 static long send_pulse_irdeo(unsigned long length)
398 unsigned char output;
399 unsigned char chunk, shifted;
401 /* how many bits have to be sent ? */
402 rawbits = length * 1152 / 10000;
407 for (i = 0, output = 0x7f; rawbits > 0; rawbits -= 3) {
408 shifted = chunk << (i * 3);
410 output &= (~shifted);
413 soutp(UART_TX, output);
414 while (!(sinp(UART_LSR) & UART_LSR_THRE))
421 soutp(UART_TX, output);
422 while (!(sinp(UART_LSR) & UART_LSR_TEMT))
427 ret = (-rawbits) * 10000 / 1152;
429 ret = (3 - i) * 3 * 10000 / 1152 + (-rawbits) * 10000 / 1152;
435 /* Version that uses Pentium rdtsc instruction to measure clocks */
438 * This version does sub-microsecond timing using rdtsc instruction,
439 * and does away with the fudged LIRC_SERIAL_TRANSMITTER_LATENCY
440 * Implicitly i586 architecture... - Steve
443 static long send_pulse_homebrew_softcarrier(unsigned long length)
446 unsigned long target, start, now;
448 /* Get going quick as we can */
451 /* Convert length from microseconds to clocks */
452 length *= conv_us_to_clocks;
453 /* And loop till time is up - flipping at right intervals */
455 target = pulse_width;
458 * FIXME: This looks like a hard busy wait, without even an occasional,
459 * polite, cpu_relax() call. There's got to be a better way?
461 * The i2c code has the result of a lot of bit-banging work, I wonder if
462 * there's something there which could be helpful here.
464 while ((now - start) < length) {
465 /* Delay till flip time */
468 } while ((now - start) < target);
474 target += space_width;
477 target += pulse_width;
482 return ((now - start) - length) / conv_us_to_clocks;
484 #else /* ! USE_RDTSC */
485 /* Version using udelay() */
488 * here we use fixed point arithmetic, with 8
489 * fractional bits. that gets us within 0.1% or so of the right average
490 * frequency, albeit with some jitter in pulse length - Steve
493 /* To match 8 fractional bits used for pulse/space length */
495 static long send_pulse_homebrew_softcarrier(unsigned long length)
498 unsigned long actual, target, d;
501 actual = 0; target = 0; flag = 0;
502 while (actual < length) {
505 target += space_width;
508 target += pulse_width;
510 d = (target - actual -
511 LIRC_SERIAL_TRANSMITTER_LATENCY + 128) >> 8;
513 * Note - we've checked in ioctl that the pulse/space
514 * widths are big enough so that d is > 0
517 actual += (d << 8) + LIRC_SERIAL_TRANSMITTER_LATENCY;
520 return (actual-length) >> 8;
522 #endif /* USE_RDTSC */
524 static long send_pulse_homebrew(unsigned long length)
530 return send_pulse_homebrew_softcarrier(length);
538 static void send_space_irdeo(long length)
546 static void send_space_homebrew(long length)
554 static void rbwrite(int l)
556 if (lirc_buffer_full(&rbuf)) {
557 /* no new signals will be accepted */
558 dprintk("Buffer overrun\n");
561 lirc_buffer_write(&rbuf, (void *)&l);
564 static void frbwrite(int l)
566 /* simple noise filter */
567 static int pulse, space;
568 static unsigned int ptr;
570 if (ptr > 0 && (l & PULSE_BIT)) {
571 pulse += l & PULSE_MASK;
574 rbwrite(pulse | PULSE_BIT);
580 if (!(l & PULSE_BIT)) {
590 if (space > PULSE_MASK)
593 if (space > PULSE_MASK)
599 rbwrite(pulse | PULSE_BIT);
607 static irqreturn_t lirc_irq_handler(int i, void *blah)
614 static int last_dcd = -1;
616 if ((sinp(UART_IIR) & UART_IIR_NO_INT)) {
617 /* not our interrupt */
624 status = sinp(UART_MSR);
625 if (counter > RS_ISR_PASS_LIMIT) {
626 pr_warn("AIEEEE: We're caught!\n");
629 if ((status & hardware[type].signal_pin_change)
631 /* get current time */
632 do_gettimeofday(&tv);
634 /* New mode, written by Trent Piepho
635 <xyzzy@u.washington.edu>. */
638 * The old format was not very portable.
639 * We now use an int to pass pulses
640 * and spaces to user space.
642 * If PULSE_BIT is set a pulse has been
643 * received, otherwise a space has been
644 * received. The driver needs to know if your
645 * receiver is active high or active low, or
646 * the space/pulse sense could be
647 * inverted. The bits denoted by PULSE_MASK are
648 * the length in microseconds. Lengths greater
649 * than or equal to 16 seconds are clamped to
650 * PULSE_MASK. All other bits are unused.
651 * This is a much simpler interface for user
652 * programs, as well as eliminating "out of
653 * phase" errors with space/pulse
657 /* calc time since last interrupt in microseconds */
658 dcd = (status & hardware[type].signal_pin) ? 1 : 0;
660 if (dcd == last_dcd) {
661 pr_warn("ignoring spike: %d %d %lx %lx %lx %lx\n",
663 tv.tv_sec, lasttv.tv_sec,
664 (unsigned long)tv.tv_usec,
665 (unsigned long)lasttv.tv_usec);
669 deltv = tv.tv_sec-lasttv.tv_sec;
670 if (tv.tv_sec < lasttv.tv_sec ||
671 (tv.tv_sec == lasttv.tv_sec &&
672 tv.tv_usec < lasttv.tv_usec)) {
673 pr_warn("AIEEEE: your clock just jumped backwards\n");
674 pr_warn("%d %d %lx %lx %lx %lx\n",
676 tv.tv_sec, lasttv.tv_sec,
677 (unsigned long)tv.tv_usec,
678 (unsigned long)lasttv.tv_usec);
680 } else if (deltv > 15) {
681 data = PULSE_MASK; /* really long time */
684 pr_warn("AIEEEE: %d %d %lx %lx %lx %lx\n",
686 tv.tv_sec, lasttv.tv_sec,
687 (unsigned long)tv.tv_usec,
688 (unsigned long)lasttv.tv_usec);
690 * detecting pulse while this
693 sense = sense ? 0 : 1;
696 data = (int) (deltv*1000000 +
699 frbwrite(dcd^sense ? data : (data|PULSE_BIT));
702 wake_up_interruptible(&rbuf.wait_poll);
704 } while (!(sinp(UART_IIR) & UART_IIR_NO_INT)); /* still pending ? */
709 static int hardware_init_port(void)
711 u8 scratch, scratch2, scratch3;
714 * This is a simple port existence test, borrowed from the autoconfig
715 * function in drivers/serial/8250.c
717 scratch = sinp(UART_IER);
722 scratch2 = sinp(UART_IER) & 0x0f;
723 soutp(UART_IER, 0x0f);
727 scratch3 = sinp(UART_IER) & 0x0f;
728 soutp(UART_IER, scratch);
729 if (scratch2 != 0 || scratch3 != 0x0f) {
730 /* we fail, there's nothing here */
731 pr_err("port existence test failed, cannot continue\n");
738 soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
740 /* First of all, disable all interrupts */
741 soutp(UART_IER, sinp(UART_IER) &
742 (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
744 /* Clear registers. */
750 /* Set line for power source */
753 /* Clear registers again to be sure. */
761 case LIRC_IRDEO_REMOTE:
762 /* setup port to 7N1 @ 115200 Baud */
763 /* 7N1+start = 9 bits at 115200 ~ 3 bits at 38kHz */
766 soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
767 /* Set divisor to 1 => 115200 Baud */
770 /* Set DLAB 0 + 7N1 */
771 soutp(UART_LCR, UART_LCR_WLEN7);
772 /* THR interrupt already disabled at this point */
781 static int lirc_serial_probe(struct platform_device *dev)
783 int i, nlow, nhigh, result;
785 result = request_irq(irq, lirc_irq_handler,
786 (share_irq ? IRQF_SHARED : 0),
787 LIRC_DRIVER_NAME, (void *)&hardware);
789 if (result == -EBUSY)
790 dev_err(&dev->dev, "IRQ %d busy\n", irq);
791 else if (result == -EINVAL)
792 dev_err(&dev->dev, "Bad irq number or handler\n");
796 /* Reserve io region. */
798 * Future MMAP-Developers: Attention!
799 * For memory mapped I/O you *might* need to use ioremap() first,
800 * for the NSLU2 it's done in boot code.
803 && (request_mem_region(iommap, 8 << ioshift,
804 LIRC_DRIVER_NAME) == NULL))
806 && (request_region(io, 8, LIRC_DRIVER_NAME) == NULL))) {
807 dev_err(&dev->dev, "port %04x already in use\n", io);
808 dev_warn(&dev->dev, "use 'setserial /dev/ttySX uart none'\n");
810 "or compile the serial port driver as module and\n");
811 dev_warn(&dev->dev, "make sure this module is loaded first\n");
816 result = hardware_init_port();
818 goto exit_release_region;
820 /* Initialize pulse/space widths */
821 init_timing_params(duty_cycle, freq);
823 /* If pin is high, then this must be an active low receiver. */
825 /* wait 1/2 sec for the power supply */
829 * probe 9 times every 0.04s, collect "votes" for
834 for (i = 0; i < 9; i++) {
835 if (sinp(UART_MSR) & hardware[type].signal_pin)
841 sense = (nlow >= nhigh ? 1 : 0);
842 dev_info(&dev->dev, "auto-detected active %s receiver\n",
843 sense ? "low" : "high");
845 dev_info(&dev->dev, "Manually using active %s receiver\n",
846 sense ? "low" : "high");
848 dprintk("Interrupt %d, port %04x obtained\n", irq, io);
853 release_mem_region(iommap, 8 << ioshift);
855 release_region(io, 8);
857 free_irq(irq, (void *)&hardware);
862 static int lirc_serial_remove(struct platform_device *dev)
864 free_irq(irq, (void *)&hardware);
867 release_mem_region(iommap, 8 << ioshift);
869 release_region(io, 8);
874 static int set_use_inc(void *data)
878 /* initialize timestamp */
879 do_gettimeofday(&lasttv);
881 spin_lock_irqsave(&hardware[type].lock, flags);
884 soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
886 soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
888 spin_unlock_irqrestore(&hardware[type].lock, flags);
893 static void set_use_dec(void *data)
894 { unsigned long flags;
896 spin_lock_irqsave(&hardware[type].lock, flags);
899 soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
901 /* First of all, disable all interrupts */
902 soutp(UART_IER, sinp(UART_IER) &
903 (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
904 spin_unlock_irqrestore(&hardware[type].lock, flags);
907 static ssize_t lirc_write(struct file *file, const char __user *buf,
908 size_t n, loff_t *ppos)
915 if (!(hardware[type].features & LIRC_CAN_SEND_PULSE))
918 count = n / sizeof(int);
919 if (n % sizeof(int) || count % 2 == 0)
921 wbuf = memdup_user(buf, n);
923 return PTR_ERR(wbuf);
924 spin_lock_irqsave(&hardware[type].lock, flags);
925 if (type == LIRC_IRDEO) {
929 for (i = 0; i < count; i++) {
931 hardware[type].send_space(wbuf[i] - delta);
933 delta = hardware[type].send_pulse(wbuf[i]);
936 spin_unlock_irqrestore(&hardware[type].lock, flags);
941 static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
944 u32 __user *uptr = (u32 __user *)arg;
948 case LIRC_GET_SEND_MODE:
949 if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
952 result = put_user(LIRC_SEND2MODE
953 (hardware[type].features&LIRC_CAN_SEND_MASK),
959 case LIRC_SET_SEND_MODE:
960 if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
963 result = get_user(value, uptr);
966 /* only LIRC_MODE_PULSE supported */
967 if (value != LIRC_MODE_PULSE)
971 case LIRC_GET_LENGTH:
975 case LIRC_SET_SEND_DUTY_CYCLE:
976 dprintk("SET_SEND_DUTY_CYCLE\n");
977 if (!(hardware[type].features&LIRC_CAN_SET_SEND_DUTY_CYCLE))
980 result = get_user(value, uptr);
983 if (value <= 0 || value > 100)
985 return init_timing_params(value, freq);
988 case LIRC_SET_SEND_CARRIER:
989 dprintk("SET_SEND_CARRIER\n");
990 if (!(hardware[type].features&LIRC_CAN_SET_SEND_CARRIER))
993 result = get_user(value, uptr);
996 if (value > 500000 || value < 20000)
998 return init_timing_params(duty_cycle, value);
1002 return lirc_dev_fop_ioctl(filep, cmd, arg);
1007 static const struct file_operations lirc_fops = {
1008 .owner = THIS_MODULE,
1009 .write = lirc_write,
1010 .unlocked_ioctl = lirc_ioctl,
1011 #ifdef CONFIG_COMPAT
1012 .compat_ioctl = lirc_ioctl,
1014 .read = lirc_dev_fop_read,
1015 .poll = lirc_dev_fop_poll,
1016 .open = lirc_dev_fop_open,
1017 .release = lirc_dev_fop_close,
1018 .llseek = no_llseek,
1021 static struct lirc_driver driver = {
1022 .name = LIRC_DRIVER_NAME,
1029 .set_use_inc = set_use_inc,
1030 .set_use_dec = set_use_dec,
1033 .owner = THIS_MODULE,
1036 static struct platform_device *lirc_serial_dev;
1038 static int lirc_serial_suspend(struct platform_device *dev,
1042 soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
1044 /* Disable all interrupts */
1045 soutp(UART_IER, sinp(UART_IER) &
1046 (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
1048 /* Clear registers. */
1057 /* twisty maze... need a forward-declaration here... */
1058 static void lirc_serial_exit(void);
1060 static int lirc_serial_resume(struct platform_device *dev)
1062 unsigned long flags;
1065 result = hardware_init_port();
1069 spin_lock_irqsave(&hardware[type].lock, flags);
1070 /* Enable Interrupt */
1071 do_gettimeofday(&lasttv);
1072 soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
1075 lirc_buffer_clear(&rbuf);
1077 spin_unlock_irqrestore(&hardware[type].lock, flags);
1082 static struct platform_driver lirc_serial_driver = {
1083 .probe = lirc_serial_probe,
1084 .remove = lirc_serial_remove,
1085 .suspend = lirc_serial_suspend,
1086 .resume = lirc_serial_resume,
1088 .name = "lirc_serial",
1089 .owner = THIS_MODULE,
1093 static int __init lirc_serial_init(void)
1097 /* Init read buffer. */
1098 result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
1102 result = platform_driver_register(&lirc_serial_driver);
1104 printk("lirc register returned %d\n", result);
1105 goto exit_buffer_free;
1108 lirc_serial_dev = platform_device_alloc("lirc_serial", 0);
1109 if (!lirc_serial_dev) {
1111 goto exit_driver_unregister;
1114 result = platform_device_add(lirc_serial_dev);
1116 goto exit_device_put;
1121 platform_device_put(lirc_serial_dev);
1122 exit_driver_unregister:
1123 platform_driver_unregister(&lirc_serial_driver);
1125 lirc_buffer_free(&rbuf);
1129 static void lirc_serial_exit(void)
1131 platform_device_unregister(lirc_serial_dev);
1132 platform_driver_unregister(&lirc_serial_driver);
1133 lirc_buffer_free(&rbuf);
1136 static int __init lirc_serial_init_module(void)
1143 case LIRC_IRDEO_REMOTE:
1146 /* if nothing specified, use ttyS0/com1 and irq 4 */
1147 io = io ? io : 0x3f8;
1148 irq = irq ? irq : 4;
1157 hardware[type].features &=
1158 ~(LIRC_CAN_SET_SEND_DUTY_CYCLE|
1159 LIRC_CAN_SET_SEND_CARRIER);
1164 /* make sure sense is either -1, 0, or 1 */
1168 result = lirc_serial_init();
1172 driver.features = hardware[type].features;
1173 driver.dev = &lirc_serial_dev->dev;
1174 driver.minor = lirc_register_driver(&driver);
1175 if (driver.minor < 0) {
1176 pr_err("register_chrdev failed!\n");
1178 return driver.minor;
1183 static void __exit lirc_serial_exit_module(void)
1185 lirc_unregister_driver(driver.minor);
1187 dprintk("cleaned up module\n");
1191 module_init(lirc_serial_init_module);
1192 module_exit(lirc_serial_exit_module);
1194 MODULE_DESCRIPTION("Infra-red receiver driver for serial ports.");
1195 MODULE_AUTHOR("Ralph Metzler, Trent Piepho, Ben Pfaff, "
1196 "Christoph Bartelmus, Andrei Tanas");
1197 MODULE_LICENSE("GPL");
1199 module_param(type, int, S_IRUGO);
1200 MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo,"
1201 " 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug,"
1202 " 5 = NSLU2 RX:CTS2/TX:GreenLED)");
1204 module_param(io, int, S_IRUGO);
1205 MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
1207 /* some architectures (e.g. intel xscale) have memory mapped registers */
1208 module_param(iommap, ulong, S_IRUGO);
1209 MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O"
1210 " (0 = no memory mapped io)");
1213 * some architectures (e.g. intel xscale) align the 8bit serial registers
1214 * on 32bit word boundaries.
1215 * See linux-kernel/drivers/tty/serial/8250/8250.c serial_in()/out()
1217 module_param(ioshift, int, S_IRUGO);
1218 MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");
1220 module_param(irq, int, S_IRUGO);
1221 MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
1223 module_param(share_irq, bool, S_IRUGO);
1224 MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)");
1226 module_param(sense, int, S_IRUGO);
1227 MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
1228 " (0 = active high, 1 = active low )");
1230 #ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
1231 module_param(txsense, bool, S_IRUGO);
1232 MODULE_PARM_DESC(txsense, "Sense of transmitter circuit"
1233 " (0 = active high, 1 = active low )");
1236 module_param(softcarrier, bool, S_IRUGO);
1237 MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
1239 module_param(debug, bool, S_IRUGO | S_IWUSR);
1240 MODULE_PARM_DESC(debug, "Enable debugging messages");