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Subject[PATCH 02/18] lirc serial port receiver/transmitter device driver
Date
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Janne Grunau <j@jannau.net>
CC: Christoph Bartelmus <lirc@bartelmus.de>
---
drivers/input/lirc/Kconfig | 7 +
drivers/input/lirc/Makefile | 1 +
drivers/input/lirc/lirc_serial.c | 1312 ++++++++++++++++++++++++++++++++++++++
3 files changed, 1320 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/lirc/lirc_serial.c
diff --git a/drivers/input/lirc/Kconfig b/drivers/input/lirc/Kconfig
index 2a04d9b..73403b9 100644
--- a/drivers/input/lirc/Kconfig
+++ b/drivers/input/lirc/Kconfig
@@ -18,4 +18,11 @@ config LIRC_DEV
help
LIRC device loadable module support, required for most LIRC drivers

+config LIRC_SERIAL
+ tristate "Homebrew Serial Port Receiver"
+ default n
+ depends on LIRC_DEV
+ help
+ Driver for Homebrew Serial Port Receivers
+
endif
diff --git a/drivers/input/lirc/Makefile b/drivers/input/lirc/Makefile
index cdb4c45..7d76128 100644
--- a/drivers/input/lirc/Makefile
+++ b/drivers/input/lirc/Makefile
@@ -6,3 +6,4 @@
EXTRA_CFLAGS =-DIRCTL_DEV_MAJOR=61 -DLIRC_SERIAL_TRANSMITTER -I$(src)

obj-$(CONFIG_LIRC_DEV) += lirc_dev.o
+obj-$(CONFIG_LIRC_SERIAL) += lirc_serial.o
diff --git a/drivers/input/lirc/lirc_serial.c b/drivers/input/lirc/lirc_serial.c
new file mode 100644
index 0000000..465edd9
--- /dev/null
+++ b/drivers/input/lirc/lirc_serial.c
@@ -0,0 +1,1312 @@
+/****************************************************************************
+ ** lirc_serial.c ***********************************************************
+ ****************************************************************************
+ *
+ * lirc_serial - Device driver that records pulse- and pause-lengths
+ * (space-lengths) between DDCD event on a serial port.
+ *
+ * Copyright (C) 1996,97 Ralph Metzler <rjkm@thp.uni-koeln.de>
+ * Copyright (C) 1998 Trent Piepho <xyzzy@u.washington.edu>
+ * Copyright (C) 1998 Ben Pfaff <blp@gnu.org>
+ * Copyright (C) 1999 Christoph Bartelmus <lirc@bartelmus.de>
+ * Copyright (C) 2007 Andrei Tanas <andrei@tanas.ca> (suspend/resume support)
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+/* Steve's changes to improve transmission fidelity:
+ - for systems with the rdtsc instruction and the clock counter, a
+ send_pule that times the pulses directly using the counter.
+ This means that the LIRC_SERIAL_TRANSMITTER_LATENCY fudge is
+ not needed. Measurement shows very stable waveform, even where
+ PCI activity slows the access to the UART, which trips up other
+ versions.
+ - For other system, non-integer-microsecond pulse/space lengths,
+ done using fixed point binary. So, much more accurate carrier
+ frequency.
+ - fine tuned transmitter latency, taking advantage of fractional
+ microseconds in previous change
+ - Fixed bug in the way transmitter latency was accounted for by
+ tuning the pulse lengths down - the send_pulse routine ignored
+ this overhead as it timed the overall pulse length - so the
+ pulse frequency was right but overall pulse length was too
+ long. Fixed by accounting for latency on each pulse/space
+ iteration.
+
+ Steve Davies <steve@daviesfam.org> July 2001
+*/
+
+#include <linux/version.h>
+
+#include <linux/autoconf.h>
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/serial_reg.h>
+#include <linux/time.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/poll.h>
+#include <linux/platform_device.h>
+
+#include <asm/system.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/fcntl.h>
+
+#if defined(LIRC_SERIAL_NSLU2)
+#include <asm/hardware.h>
+/* From Intel IXP42X Developer's Manual (#252480-005): */
+/* ftp://download.intel.com/design/network/manuals/25248005.pdf */
+#define UART_IE_IXP42X_UUE 0x40 /* IXP42X UART Unit enable */
+#define UART_IE_IXP42X_RTOIE 0x10 /* IXP42X Receiver Data Timeout int.enable */
+#ifndef NSLU2_LED_GRN_GPIO
+/* added in 2.6.22 */
+#define NSLU2_LED_GRN_GPIO NSLU2_LED_GRN
+#endif
+#endif
+
+#include "lirc.h"
+#include "lirc_dev.h"
+
+#define LIRC_DRIVER_NAME "lirc_serial"
+
+struct lirc_serial {
+ int signal_pin;
+ int signal_pin_change;
+ int on;
+ int off;
+ long (*send_pulse)(unsigned long length);
+ void (*send_space)(long length);
+ int features;
+};
+
+#define LIRC_HOMEBREW 0
+#define LIRC_IRDEO 1
+#define LIRC_IRDEO_REMOTE 2
+#define LIRC_ANIMAX 3
+#define LIRC_IGOR 4
+#define LIRC_NSLU2 5
+
+#ifdef LIRC_SERIAL_IRDEO
+static int type = LIRC_IRDEO;
+#elif defined(LIRC_SERIAL_IRDEO_REMOTE)
+static int type = LIRC_IRDEO_REMOTE;
+#elif defined(LIRC_SERIAL_ANIMAX)
+static int type = LIRC_ANIMAX;
+#elif defined(LIRC_SERIAL_IGOR)
+static int type = LIRC_IGOR;
+#elif defined(LIRC_SERIAL_NSLU2)
+static int type = LIRC_NSLU2;
+#else
+static int type = LIRC_HOMEBREW;
+#endif
+
+/* Set defaults for NSLU2 */
+#if defined(LIRC_SERIAL_NSLU2)
+#ifndef LIRC_IRQ
+#define LIRC_IRQ IRQ_IXP4XX_UART2
+#endif
+#ifndef LIRC_PORT
+#define LIRC_PORT (IXP4XX_UART2_BASE_VIRT + REG_OFFSET)
+#endif
+#ifndef LIRC_IOMMAP
+#define LIRC_IOMMAP IXP4XX_UART2_BASE_PHYS
+#endif
+#ifndef LIRC_IOSHIFT
+#define LIRC_IOSHIFT 2
+#endif
+#ifndef LIRC_ALLOW_MMAPPED_IO
+#define LIRC_ALLOW_MMAPPED_IO
+#endif
+#endif
+
+#if defined(LIRC_ALLOW_MMAPPED_IO)
+#ifndef LIRC_IOMMAP
+#define LIRC_IOMMAP 0
+#endif
+#ifndef LIRC_IOSHIFT
+#define LIRC_IOSHIFT 0
+#endif
+static int iommap = LIRC_IOMMAP;
+static int ioshift = LIRC_IOSHIFT;
+#endif
+
+#ifdef LIRC_SERIAL_SOFTCARRIER
+static int softcarrier = 1;
+#else
+static int softcarrier;
+#endif
+
+static int share_irq;
+static int debug;
+
+#define dprintk(fmt, args...) \
+ do { \
+ if (debug) \
+ printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
+ fmt, ## args); \
+ } while (0)
+
+/* forward declarations */
+static long send_pulse_irdeo(unsigned long length);
+static long send_pulse_homebrew(unsigned long length);
+static void send_space_irdeo(long length);
+static void send_space_homebrew(long length);
+
+static struct lirc_serial hardware[] = {
+ /* home-brew receiver/transmitter */
+ {
+ UART_MSR_DCD,
+ UART_MSR_DDCD,
+ UART_MCR_RTS|UART_MCR_OUT2|UART_MCR_DTR,
+ UART_MCR_RTS|UART_MCR_OUT2,
+ send_pulse_homebrew,
+ send_space_homebrew,
+ (
+#ifdef LIRC_SERIAL_TRANSMITTER
+ LIRC_CAN_SET_SEND_DUTY_CYCLE|
+ LIRC_CAN_SET_SEND_CARRIER|
+ LIRC_CAN_SEND_PULSE|
+#endif
+ LIRC_CAN_REC_MODE2)
+ },
+
+ /* IRdeo classic */
+ {
+ UART_MSR_DSR,
+ UART_MSR_DDSR,
+ UART_MCR_OUT2,
+ UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2,
+ send_pulse_irdeo,
+ send_space_irdeo,
+ (LIRC_CAN_SET_SEND_DUTY_CYCLE|
+ LIRC_CAN_SEND_PULSE|
+ LIRC_CAN_REC_MODE2)
+ },
+
+ /* IRdeo remote */
+ {
+ UART_MSR_DSR,
+ UART_MSR_DDSR,
+ UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2,
+ UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2,
+ send_pulse_irdeo,
+ send_space_irdeo,
+ (LIRC_CAN_SET_SEND_DUTY_CYCLE|
+ LIRC_CAN_SEND_PULSE|
+ LIRC_CAN_REC_MODE2)
+ },
+
+ /* AnimaX */
+ {
+ UART_MSR_DCD,
+ UART_MSR_DDCD,
+ 0,
+ UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2,
+ NULL,
+ NULL,
+ LIRC_CAN_REC_MODE2
+ },
+
+ /* home-brew receiver/transmitter (Igor Cesko's variation) */
+ {
+ UART_MSR_DSR,
+ UART_MSR_DDSR,
+ UART_MCR_RTS|UART_MCR_OUT2|UART_MCR_DTR,
+ UART_MCR_RTS|UART_MCR_OUT2,
+ send_pulse_homebrew,
+ send_space_homebrew,
+ (
+#ifdef LIRC_SERIAL_TRANSMITTER
+ LIRC_CAN_SET_SEND_DUTY_CYCLE|
+ LIRC_CAN_SET_SEND_CARRIER|
+ LIRC_CAN_SEND_PULSE|
+#endif
+ LIRC_CAN_REC_MODE2)
+ },
+
+#if defined(LIRC_SERIAL_NSLU2)
+ /* Modified Linksys Network Storage Link USB 2.0 (NSLU2):
+ We receive on CTS of the 2nd serial port (R142,LHS), we
+ transmit with a IR diode between GPIO[1] (green status LED),
+ and ground (Matthias Goebl <matthias.goebl@goebl.net>).
+ See also http://www.nslu2-linux.org for this device */
+ {
+ UART_MSR_CTS,
+ UART_MSR_DCTS,
+ UART_MCR_RTS|UART_MCR_OUT2|UART_MCR_DTR,
+ UART_MCR_RTS|UART_MCR_OUT2,
+ send_pulse_homebrew,
+ send_space_homebrew,
+ (
+#ifdef LIRC_SERIAL_TRANSMITTER
+ LIRC_CAN_SET_SEND_DUTY_CYCLE|
+ LIRC_CAN_SET_SEND_CARRIER|
+ LIRC_CAN_SEND_PULSE|
+#endif
+ LIRC_CAN_REC_MODE2)
+ },
+#endif
+
+};
+
+#define RS_ISR_PASS_LIMIT 256
+
+/* A long pulse code from a remote might take upto 300 bytes. The
+ daemon should read the bytes as soon as they are generated, so take
+ the number of keys you think you can push before the daemon runs
+ and multiply by 300. The driver will warn you if you overrun this
+ buffer. If you have a slow computer or non-busmastering IDE disks,
+ maybe you will need to increase this. */
+
+/* This MUST be a power of two! It has to be larger than 1 as well. */
+
+#define RBUF_LEN 256
+#define WBUF_LEN 256
+
+static int sense = -1; /* -1 = auto, 0 = active high, 1 = active low */
+static int txsense; /* 0 = active high, 1 = active low */
+
+#ifndef LIRC_IRQ
+#define LIRC_IRQ 4
+#endif
+#ifndef LIRC_PORT
+#define LIRC_PORT 0x3f8
+#endif
+
+static int io = LIRC_PORT;
+static int irq = LIRC_IRQ;
+
+static struct timeval lasttv = {0, 0};
+
+static struct lirc_buffer rbuf;
+
+static int wbuf[WBUF_LEN];
+
+static unsigned int freq = 38000;
+static unsigned int duty_cycle = 50;
+
+/* Initialized in init_timing_params() */
+static unsigned long period;
+static unsigned long pulse_width;
+static unsigned long space_width;
+
+#if defined(__i386__)
+/*
+ From:
+ Linux I/O port programming mini-HOWTO
+ Author: Riku Saikkonen <Riku.Saikkonen@hut.fi>
+ v, 28 December 1997
+
+ [...]
+ Actually, a port I/O instruction on most ports in the 0-0x3ff range
+ takes almost exactly 1 microsecond, so if you're, for example, using
+ the parallel port directly, just do additional inb()s from that port
+ to delay.
+ [...]
+*/
+/* transmitter latency 1.5625us 0x1.90 - this figure arrived at from
+ * comment above plus trimming to match actual measured frequency.
+ * This will be sensitive to cpu speed, though hopefully most of the 1.5us
+ * is spent in the uart access. Still - for reference test machine was a
+ * 1.13GHz Athlon system - Steve
+ */
+
+/* changed from 400 to 450 as this works better on slower machines;
+ faster machines will use the rdtsc code anyway */
+
+#define LIRC_SERIAL_TRANSMITTER_LATENCY 450
+
+#else
+
+/* does anybody have information on other platforms ? */
+/* 256 = 1<<8 */
+#define LIRC_SERIAL_TRANSMITTER_LATENCY 256
+
+#endif /* __i386__ */
+
+static inline unsigned int sinp(int offset)
+{
+#if defined(LIRC_ALLOW_MMAPPED_IO)
+ if (iommap != 0) {
+ /* the register is memory-mapped */
+ offset <<= ioshift;
+ return readb(io + offset);
+ }
+#endif
+ return inb(io + offset);
+}
+
+static inline void soutp(int offset, int value)
+{
+#if defined(LIRC_ALLOW_MMAPPED_IO)
+ if (iommap != 0) {
+ /* the register is memory-mapped */
+ offset <<= ioshift;
+ writeb(value, io + offset);
+ }
+#endif
+ outb(value, io + offset);
+}
+
+static inline void on(void)
+{
+#if defined(LIRC_SERIAL_NSLU2)
+ /* On NSLU2, we put the transmit diode between the output of the green
+ status LED and ground */
+ if (type == LIRC_NSLU2) {
+ gpio_line_set(NSLU2_LED_GRN_GPIO, IXP4XX_GPIO_LOW);
+ return;
+ }
+#endif
+ if (txsense)
+ soutp(UART_MCR, hardware[type].off);
+ else
+ soutp(UART_MCR, hardware[type].on);
+}
+
+static inline void off(void)
+{
+#if defined(LIRC_SERIAL_NSLU2)
+ if (type == LIRC_NSLU2) {
+ gpio_line_set(NSLU2_LED_GRN_GPIO, IXP4XX_GPIO_HIGH);
+ return;
+ }
+#endif
+ if (txsense)
+ soutp(UART_MCR, hardware[type].on);
+ else
+ soutp(UART_MCR, hardware[type].off);
+}
+
+#ifndef MAX_UDELAY_MS
+#define MAX_UDELAY_US 5000
+#else
+#define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
+#endif
+
+static inline void safe_udelay(unsigned long usecs)
+{
+ while (usecs > MAX_UDELAY_US) {
+ udelay(MAX_UDELAY_US);
+ usecs -= MAX_UDELAY_US;
+ }
+ udelay(usecs);
+}
+
+#ifdef USE_RDTSC
+/* This is an overflow/precision juggle, complicated in that we can't
+ do long long divide in the kernel */
+
+/* When we use the rdtsc instruction to measure clocks, we keep the
+ * pulse and space widths as clock cycles. As this is CPU speed
+ * dependent, the widths must be calculated in init_port and ioctl
+ * time
+ */
+
+/* So send_pulse can quickly convert microseconds to clocks */
+static unsigned long conv_us_to_clocks;
+
+static inline int init_timing_params(unsigned int new_duty_cycle,
+ unsigned int new_freq)
+{
+ unsigned long long loops_per_sec, work;
+
+ duty_cycle = new_duty_cycle;
+ freq = new_freq;
+
+ loops_per_sec = current_cpu_data.loops_per_jiffy;
+ loops_per_sec *= HZ;
+
+ /* How many clocks in a microsecond?, avoiding long long divide */
+ work = loops_per_sec;
+ work *= 4295; /* 4295 = 2^32 / 1e6 */
+ conv_us_to_clocks = (work>>32);
+
+ /* Carrier period in clocks, approach good up to 32GHz clock,
+ gets carrier frequency within 8Hz */
+ period = loops_per_sec>>3;
+ period /= (freq>>3);
+
+ /* Derive pulse and space from the period */
+
+ pulse_width = period*duty_cycle/100;
+ space_width = period - pulse_width;
+ dprintk("in init_timing_params, freq=%d, duty_cycle=%d, "
+ "clk/jiffy=%ld, pulse=%ld, space=%ld, "
+ "conv_us_to_clocks=%ld\n",
+ freq, duty_cycle, current_cpu_data.loops_per_jiffy,
+ pulse_width, space_width, conv_us_to_clocks);
+ return 0;
+}
+#else /* ! USE_RDTSC */
+static inline int init_timing_params(unsigned int new_duty_cycle,
+ unsigned int new_freq)
+{
+/* period, pulse/space width are kept with 8 binary places -
+ * IE multiplied by 256. */
+ if (256*1000000L/new_freq*new_duty_cycle/100 <=
+ LIRC_SERIAL_TRANSMITTER_LATENCY)
+ return -EINVAL;
+ if (256*1000000L/new_freq*(100-new_duty_cycle)/100 <=
+ LIRC_SERIAL_TRANSMITTER_LATENCY)
+ return -EINVAL;
+ duty_cycle = new_duty_cycle;
+ freq = new_freq;
+ period = 256*1000000L/freq;
+ pulse_width = period*duty_cycle/100;
+ space_width = period-pulse_width;
+ dprintk("in init_timing_params, freq=%d pulse=%ld, "
+ "space=%ld\n", freq, pulse_width, space_width);
+ return 0;
+}
+#endif /* USE_RDTSC */
+
+
+/* return value: space length delta */
+
+static long send_pulse_irdeo(unsigned long length)
+{
+ long rawbits;
+ int i;
+ unsigned char output;
+ unsigned char chunk, shifted;
+
+ /* how many bits have to be sent ? */
+ rawbits = length*1152/10000;
+ if (duty_cycle > 50)
+ chunk = 3;
+ else
+ chunk = 1;
+ for (i = 0, output = 0x7f; rawbits > 0; rawbits -= 3) {
+ shifted = chunk<<(i*3);
+ shifted >>= 1;
+ output &= (~shifted);
+ i++;
+ if (i == 3) {
+ soutp(UART_TX, output);
+ while (!(sinp(UART_LSR) & UART_LSR_THRE))
+ ;
+ output = 0x7f;
+ i = 0;
+ }
+ }
+ if (i != 0) {
+ soutp(UART_TX, output);
+ while (!(sinp(UART_LSR) & UART_LSR_TEMT))
+ ;
+ }
+
+ if (i == 0)
+ return (-rawbits)*10000/1152;
+ else
+ return (3-i)*3*10000/1152 + (-rawbits)*10000/1152;
+}
+
+#ifdef USE_RDTSC
+/* Version that uses Pentium rdtsc instruction to measure clocks */
+
+/* This version does sub-microsecond timing using rdtsc instruction,
+ * and does away with the fudged LIRC_SERIAL_TRANSMITTER_LATENCY
+ * Implicitly i586 architecture... - Steve
+ */
+
+static inline long send_pulse_homebrew_softcarrier(unsigned long length)
+{
+ int flag;
+ unsigned long target, start, now;
+
+ /* Get going quick as we can */
+ rdtscl(start); on();
+ /* Convert length from microseconds to clocks */
+ length *= conv_us_to_clocks;
+ /* And loop till time is up - flipping at right intervals */
+ now = start;
+ target = pulse_width;
+ flag = 1;
+ while ((now-start) < length) {
+ /* Delay till flip time */
+ do {
+ rdtscl(now);
+ } while ((now-start) < target);
+
+ /* flip */
+ if (flag) {
+ rdtscl(now); off();
+ target += space_width;
+ } else {
+ rdtscl(now); on();
+ target += pulse_width;
+ }
+ flag = !flag;
+ }
+ rdtscl(now);
+ return ((now-start)-length) / conv_us_to_clocks;
+}
+#else /* ! USE_RDTSC */
+/* Version using udelay() */
+
+/* here we use fixed point arithmetic, with 8
+ fractional bits. that gets us within 0.1% or so of the right average
+ frequency, albeit with some jitter in pulse length - Steve */
+
+/* To match 8 fractional bits used for pulse/space length */
+
+static inline long send_pulse_homebrew_softcarrier(unsigned long length)
+{
+ int flag;
+ unsigned long actual, target, d;
+ length <<= 8;
+
+ actual = 0; target = 0; flag = 0;
+ while (actual < length) {
+ if (flag) {
+ off();
+ target += space_width;
+ } else {
+ on();
+ target += pulse_width;
+ }
+ d = (target-actual-LIRC_SERIAL_TRANSMITTER_LATENCY+128)>>8;
+ /* Note - we've checked in ioctl that the pulse/space
+ widths are big enough so that d is > 0 */
+ udelay(d);
+ actual += (d<<8)+LIRC_SERIAL_TRANSMITTER_LATENCY;
+ flag = !flag;
+ }
+ return (actual-length)>>8;
+}
+#endif /* USE_RDTSC */
+
+static long send_pulse_homebrew(unsigned long length)
+{
+ if (length <= 0)
+ return 0;
+
+ if (softcarrier)
+ return send_pulse_homebrew_softcarrier(length);
+ else {
+ on();
+ safe_udelay(length);
+ return 0;
+ }
+}
+
+static void send_space_irdeo(long length)
+{
+ if (length <= 0)
+ return;
+
+ safe_udelay(length);
+}
+
+static void send_space_homebrew(long length)
+{
+ off();
+ if (length <= 0)
+ return;
+ safe_udelay(length);
+}
+
+static inline void rbwrite(int l)
+{
+ if (lirc_buffer_full(&rbuf)) {
+ /* no new signals will be accepted */
+ dprintk("Buffer overrun\n");
+ return;
+ }
+ _lirc_buffer_write_1(&rbuf, (void *)&l);
+}
+
+static inline void frbwrite(int l)
+{
+ /* simple noise filter */
+ static int pulse, space;
+ static unsigned int ptr;
+
+ if (ptr > 0 && (l & PULSE_BIT)) {
+ pulse += l & PULSE_MASK;
+ if (pulse > 250) {
+ rbwrite(space);
+ rbwrite(pulse | PULSE_BIT);
+ ptr = 0;
+ pulse = 0;
+ }
+ return;
+ }
+ if (!(l & PULSE_BIT)) {
+ if (ptr == 0) {
+ if (l > 20000) {
+ space = l;
+ ptr++;
+ return;
+ }
+ } else {
+ if (l > 20000) {
+ space += pulse;
+ if (space > PULSE_MASK)
+ space = PULSE_MASK;
+ space += l;
+ if (space > PULSE_MASK)
+ space = PULSE_MASK;
+ pulse = 0;
+ return;
+ }
+ rbwrite(space);
+ rbwrite(pulse | PULSE_BIT);
+ ptr = 0;
+ pulse = 0;
+ }
+ }
+ rbwrite(l);
+}
+
+static irqreturn_t irq_handler(int i, void *blah)
+{
+ struct timeval tv;
+ int status, counter, dcd;
+ long deltv;
+ int data;
+ static int last_dcd = -1;
+
+ if ((sinp(UART_IIR) & UART_IIR_NO_INT)) {
+ /* not our interrupt */
+ return IRQ_RETVAL(IRQ_NONE);
+ }
+
+ counter = 0;
+ do {
+ counter++;
+ status = sinp(UART_MSR);
+ if (counter > RS_ISR_PASS_LIMIT) {
+ printk(KERN_WARNING LIRC_DRIVER_NAME ": AIEEEE: "
+ "We're caught!\n");
+ break;
+ }
+ if ((status&hardware[type].signal_pin_change) && sense != -1) {
+ /* get current time */
+ do_gettimeofday(&tv);
+
+ /* New mode, written by Trent Piepho
+ <xyzzy@u.washington.edu>. */
+
+ /* The old format was not very portable.
+ We now use an int to pass pulses
+ and spaces to user space.
+
+ If PULSE_BIT is set a pulse has been
+ received, otherwise a space has been
+ received. The driver needs to know if your
+ receiver is active high or active low, or
+ the space/pulse sense could be
+ inverted. The bits denoted by PULSE_MASK are
+ the length in microseconds. Lengths greater
+ than or equal to 16 seconds are clamped to
+ PULSE_MASK. All other bits are unused.
+ This is a much simpler interface for user
+ programs, as well as eliminating "out of
+ phase" errors with space/pulse
+ autodetection. */
+
+ /* calculate time since last interrupt in
+ microseconds */
+ dcd = (status & hardware[type].signal_pin) ? 1 : 0;
+
+ if (dcd == last_dcd) {
+ printk(KERN_WARNING LIRC_DRIVER_NAME
+ ": ignoring spike: %d %d %lx %lx %lx %lx\n",
+ dcd, sense,
+ tv.tv_sec, lasttv.tv_sec,
+ tv.tv_usec, lasttv.tv_usec);
+ continue;
+ }
+
+ deltv = tv.tv_sec-lasttv.tv_sec;
+ if (tv.tv_sec < lasttv.tv_sec ||
+ (tv.tv_sec == lasttv.tv_sec &&
+ tv.tv_usec < lasttv.tv_usec)) {
+ printk(KERN_WARNING LIRC_DRIVER_NAME
+ ": AIEEEE: your clock just jumped "
+ "backwards\n");
+ printk(KERN_WARNING LIRC_DRIVER_NAME
+ ": %d %d %lx %lx %lx %lx\n",
+ dcd, sense,
+ tv.tv_sec, lasttv.tv_sec,
+ tv.tv_usec, lasttv.tv_usec);
+ data = PULSE_MASK;
+ } else if (deltv > 15) {
+ data = PULSE_MASK; /* really long time */
+ if (!(dcd^sense)) {
+ /* sanity check */
+ printk(KERN_WARNING LIRC_DRIVER_NAME
+ ": AIEEEE: "
+ "%d %d %lx %lx %lx %lx\n",
+ dcd, sense,
+ tv.tv_sec, lasttv.tv_sec,
+ tv.tv_usec, lasttv.tv_usec);
+ /* detecting pulse while this
+ MUST be a space! */
+ sense = sense ? 0 : 1;
+ }
+ } else
+ data = (int) (deltv*1000000 +
+ tv.tv_usec -
+ lasttv.tv_usec);
+ frbwrite(dcd^sense ? data : (data|PULSE_BIT));
+ lasttv = tv;
+ last_dcd = dcd;
+ wake_up_interruptible(&rbuf.wait_poll);
+ }
+ } while (!(sinp(UART_IIR) & UART_IIR_NO_INT)); /* still pending ? */
+ return IRQ_RETVAL(IRQ_HANDLED);
+}
+
+static void hardware_init_port(void)
+{
+ unsigned long flags;
+ local_irq_save(flags);
+
+ /* Set DLAB 0. */
+ soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+ /* First of all, disable all interrupts */
+ soutp(UART_IER, sinp(UART_IER) &
+ (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
+
+ /* Clear registers. */
+ sinp(UART_LSR);
+ sinp(UART_RX);
+ sinp(UART_IIR);
+ sinp(UART_MSR);
+
+#if defined(LIRC_SERIAL_NSLU2)
+ if (type == LIRC_NSLU2) {
+ /* Setup NSLU2 UART */
+
+ /* Enable UART */
+ soutp(UART_IER, sinp(UART_IER) | UART_IE_IXP42X_UUE);
+ /* Disable Receiver data Time out interrupt */
+ soutp(UART_IER, sinp(UART_IER) & ~UART_IE_IXP42X_RTOIE);
+ /* set out2 = interupt unmask; off() doesn't set MCR
+ on NSLU2 */
+ soutp(UART_MCR, UART_MCR_RTS|UART_MCR_OUT2);
+ }
+#endif
+
+ /* Set line for power source */
+ off();
+
+ /* Clear registers again to be sure. */
+ sinp(UART_LSR);
+ sinp(UART_RX);
+ sinp(UART_IIR);
+ sinp(UART_MSR);
+
+ switch (type) {
+ case LIRC_IRDEO:
+ case LIRC_IRDEO_REMOTE:
+ /* setup port to 7N1 @ 115200 Baud */
+ /* 7N1+start = 9 bits at 115200 ~ 3 bits at 38kHz */
+
+ /* Set DLAB 1. */
+ soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
+ /* Set divisor to 1 => 115200 Baud */
+ soutp(UART_DLM, 0);
+ soutp(UART_DLL, 1);
+ /* Set DLAB 0 + 7N1 */
+ soutp(UART_LCR, UART_LCR_WLEN7);
+ /* THR interrupt already disabled at this point */
+ break;
+ default:
+ break;
+ }
+
+ local_irq_restore(flags);
+}
+
+static int init_port(void)
+{
+ int i, nlow, nhigh;
+
+ /* Reserve io region. */
+#if defined(LIRC_ALLOW_MMAPPED_IO)
+ /* Future MMAP-Developers: Attention!
+ For memory mapped I/O you *might* need to use ioremap() first,
+ for the NSLU2 it's done in boot code. */
+ if (((iommap != 0)
+ && (request_mem_region(iommap, 8<<ioshift,
+ LIRC_DRIVER_NAME) == NULL))
+ || ((iommap == 0)
+ && (request_region(io, 8, LIRC_DRIVER_NAME) == NULL))) {
+#else
+ if (request_region(io, 8, LIRC_DRIVER_NAME) == NULL) {
+#endif
+ printk(KERN_ERR LIRC_DRIVER_NAME
+ ": port %04x already in use\n", io);
+ printk(KERN_WARNING LIRC_DRIVER_NAME
+ ": use 'setserial /dev/ttySX uart none'\n");
+ printk(KERN_WARNING LIRC_DRIVER_NAME
+ ": or compile the serial port driver as module and\n");
+ printk(KERN_WARNING LIRC_DRIVER_NAME
+ ": make sure this module is loaded first\n");
+ return -EBUSY;
+ }
+
+ hardware_init_port();
+
+ /* Initialize pulse/space widths */
+ init_timing_params(duty_cycle, freq);
+
+ /* If pin is high, then this must be an active low receiver. */
+ if (sense == -1) {
+ /* wait 1/2 sec for the power supply */
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(HZ/2);
+
+ /* probe 9 times every 0.04s, collect "votes" for
+ active high/low */
+ nlow = 0;
+ nhigh = 0;
+ for (i = 0; i < 9; i++) {
+ if (sinp(UART_MSR) & hardware[type].signal_pin)
+ nlow++;
+ else
+ nhigh++;
+ schedule_timeout(HZ/25);
+ }
+ sense = (nlow >= nhigh ? 1 : 0);
+ printk(KERN_INFO LIRC_DRIVER_NAME ": auto-detected active "
+ "%s receiver\n", sense ? "low" : "high");
+ } else
+ printk(KERN_INFO LIRC_DRIVER_NAME ": Manually using active "
+ "%s receiver\n", sense ? "low" : "high");
+
+ return 0;
+}
+
+static int set_use_inc(void *data)
+{
+ int result;
+ unsigned long flags;
+
+ /* Init read buffer. */
+ if (lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN) < 0)
+ return -ENOMEM;
+
+ /* initialize timestamp */
+ do_gettimeofday(&lasttv);
+
+ result = request_irq(irq, irq_handler,
+ IRQF_DISABLED | (share_irq ? IRQF_SHARED : 0),
+ LIRC_DRIVER_NAME, (void *)&hardware);
+
+ switch (result) {
+ case -EBUSY:
+ printk(KERN_ERR LIRC_DRIVER_NAME ": IRQ %d busy\n", irq);
+ lirc_buffer_free(&rbuf);
+ return -EBUSY;
+ case -EINVAL:
+ printk(KERN_ERR LIRC_DRIVER_NAME
+ ": Bad irq number or handler\n");
+ lirc_buffer_free(&rbuf);
+ return -EINVAL;
+ default:
+ dprintk("Interrupt %d, port %04x obtained\n", irq, io);
+ break;
+ };
+
+ local_irq_save(flags);
+
+ /* Set DLAB 0. */
+ soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+ soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
+
+ local_irq_restore(flags);
+
+ return 0;
+}
+
+static void set_use_dec(void *data)
+{ unsigned long flags;
+
+ local_irq_save(flags);
+
+ /* Set DLAB 0. */
+ soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+ /* First of all, disable all interrupts */
+ soutp(UART_IER, sinp(UART_IER) &
+ (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
+ local_irq_restore(flags);
+
+ free_irq(irq, (void *)&hardware);
+
+ dprintk("freed IRQ %d\n", irq);
+ lirc_buffer_free(&rbuf);
+}
+
+static ssize_t lirc_write(struct file *file, const char *buf,
+ size_t n, loff_t *ppos)
+{
+ int i, count;
+ unsigned long flags;
+ long delta = 0;
+
+ if (!(hardware[type].features&LIRC_CAN_SEND_PULSE))
+ return -EBADF;
+
+ if (n % sizeof(int))
+ return -EINVAL;
+ count = n / sizeof(int);
+ if (count > WBUF_LEN || count % 2 == 0)
+ return -EINVAL;
+ if (copy_from_user(wbuf, buf, n))
+ return -EFAULT;
+ local_irq_save(flags);
+ if (type == LIRC_IRDEO) {
+ /* DTR, RTS down */
+ on();
+ }
+ for (i = 0; i < count; i++) {
+ if (i%2)
+ hardware[type].send_space(wbuf[i]-delta);
+ else
+ delta = hardware[type].send_pulse(wbuf[i]);
+ }
+ off();
+ local_irq_restore(flags);
+ return n;
+}
+
+static int lirc_ioctl(struct inode *node, struct file *filep, unsigned int cmd,
+ unsigned long arg)
+{
+ int result;
+ unsigned long value;
+ unsigned int ivalue;
+
+ switch (cmd) {
+ case LIRC_GET_SEND_MODE:
+ if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
+ return -ENOIOCTLCMD;
+
+ result = put_user(LIRC_SEND2MODE
+ (hardware[type].features&LIRC_CAN_SEND_MASK),
+ (unsigned long *) arg);
+ if (result)
+ return result;
+ break;
+
+ case LIRC_SET_SEND_MODE:
+ if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
+ return -ENOIOCTLCMD;
+
+ result = get_user(value, (unsigned long *) arg);
+ if (result)
+ return result;
+ /* only LIRC_MODE_PULSE supported */
+ if (value != LIRC_MODE_PULSE)
+ return -ENOSYS;
+ break;
+
+ case LIRC_GET_LENGTH:
+ return -ENOSYS;
+ break;
+
+ case LIRC_SET_SEND_DUTY_CYCLE:
+ dprintk("SET_SEND_DUTY_CYCLE\n");
+ if (!(hardware[type].features&LIRC_CAN_SET_SEND_DUTY_CYCLE))
+ return -ENOIOCTLCMD;
+
+ result = get_user(ivalue, (unsigned int *) arg);
+ if (result)
+ return result;
+ if (ivalue <= 0 || ivalue > 100)
+ return -EINVAL;
+ return init_timing_params(ivalue, freq);
+ break;
+
+ case LIRC_SET_SEND_CARRIER:
+ dprintk("SET_SEND_CARRIER\n");
+ if (!(hardware[type].features&LIRC_CAN_SET_SEND_CARRIER))
+ return -ENOIOCTLCMD;
+
+ result = get_user(ivalue, (unsigned int *) arg);
+ if (result)
+ return result;
+ if (ivalue > 500000 || ivalue < 20000)
+ return -EINVAL;
+ return init_timing_params(duty_cycle, ivalue);
+ break;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static struct file_operations lirc_fops = {
+ .write = lirc_write,
+};
+
+static struct lirc_plugin plugin = {
+ .name = LIRC_DRIVER_NAME,
+ .minor = -1,
+ .code_length = 1,
+ .sample_rate = 0,
+ .data = NULL,
+ .add_to_buf = NULL,
+ .get_queue = NULL,
+ .rbuf = &rbuf,
+ .set_use_inc = set_use_inc,
+ .set_use_dec = set_use_dec,
+ .ioctl = lirc_ioctl,
+ .fops = &lirc_fops,
+ .dev = NULL,
+ .owner = THIS_MODULE,
+};
+
+#ifdef MODULE
+
+static struct platform_device *lirc_serial_dev;
+
+static int __devinit lirc_serial_probe(struct platform_device *dev)
+{
+ return 0;
+}
+
+static int __devexit lirc_serial_remove(struct platform_device *dev)
+{
+ return 0;
+}
+
+static int lirc_serial_suspend(struct platform_device *dev,
+ pm_message_t state)
+{
+ /* Set DLAB 0. */
+ soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+ /* Disable all interrupts */
+ soutp(UART_IER, sinp(UART_IER) &
+ (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
+
+ /* Clear registers. */
+ sinp(UART_LSR);
+ sinp(UART_RX);
+ sinp(UART_IIR);
+ sinp(UART_MSR);
+
+ return 0;
+}
+
+static int lirc_serial_resume(struct platform_device *dev)
+{
+ unsigned long flags;
+
+ hardware_init_port();
+
+ local_irq_save(flags);
+ /* Enable Interrupt */
+ do_gettimeofday(&lasttv);
+ soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
+ off();
+
+ lirc_buffer_clear(&rbuf);
+
+ local_irq_restore(flags);
+
+ return 0;
+}
+
+static struct platform_driver lirc_serial_driver = {
+ .probe = lirc_serial_probe,
+ .remove = __devexit_p(lirc_serial_remove),
+ .suspend = lirc_serial_suspend,
+ .resume = lirc_serial_resume,
+ .driver = {
+ .name = "lirc_serial",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init lirc_serial_init(void)
+{
+ int result;
+
+ result = platform_driver_register(&lirc_serial_driver);
+ if (result) {
+ printk("lirc register returned %d\n", result);
+ return result;
+ }
+
+ lirc_serial_dev = platform_device_alloc("lirc_serial", 0);
+ if (!lirc_serial_dev) {
+ result = -ENOMEM;
+ goto exit_driver_unregister;
+ }
+
+ result = platform_device_add(lirc_serial_dev);
+ if (result)
+ goto exit_device_put;
+
+ return 0;
+
+exit_device_put:
+ platform_device_put(lirc_serial_dev);
+exit_driver_unregister:
+ platform_driver_unregister(&lirc_serial_driver);
+ return result;
+}
+
+static void __exit lirc_serial_exit(void)
+{
+ platform_device_unregister(lirc_serial_dev);
+ platform_driver_unregister(&lirc_serial_driver);
+}
+
+int __init init_module(void)
+{
+ int result;
+
+ result = lirc_serial_init();
+ if (result)
+ return result;
+ switch (type) {
+ case LIRC_HOMEBREW:
+ case LIRC_IRDEO:
+ case LIRC_IRDEO_REMOTE:
+ case LIRC_ANIMAX:
+ case LIRC_IGOR:
+#if defined(LIRC_SERIAL_NSLU2)
+ case LIRC_NSLU2:
+#endif
+ break;
+ default:
+ result = -EINVAL;
+ goto exit_serial_exit;
+ }
+ if (!softcarrier) {
+ switch (type) {
+ case LIRC_HOMEBREW:
+ case LIRC_IGOR:
+ case LIRC_NSLU2:
+ hardware[type].features &=
+ ~(LIRC_CAN_SET_SEND_DUTY_CYCLE|
+ LIRC_CAN_SET_SEND_CARRIER);
+ break;
+ }
+ }
+ result = init_port();
+ if (result < 0)
+ goto exit_serial_exit;
+ plugin.features = hardware[type].features;
+ plugin.minor = lirc_register_plugin(&plugin);
+ if (plugin.minor < 0) {
+ printk(KERN_ERR LIRC_DRIVER_NAME
+ ": register_chrdev failed!\n");
+ result = -EIO;
+ goto exit_release;
+ }
+ return 0;
+exit_release:
+ release_region(io, 8);
+exit_serial_exit:
+ lirc_serial_exit();
+ return result;
+}
+
+void __exit cleanup_module(void)
+{
+ lirc_serial_exit();
+#if defined(LIRC_ALLOW_MMAPPED_IO)
+ if (iommap != 0)
+ release_mem_region(iommap, 8<<ioshift);
+ else
+ release_region(io, 8);
+#else
+ release_region(io, 8);
+#endif
+ lirc_unregister_plugin(plugin.minor);
+ dprintk("cleaned up module\n");
+}
+
+MODULE_DESCRIPTION("Infra-red receiver driver for serial ports.");
+MODULE_AUTHOR("Ralph Metzler, Trent Piepho, Ben Pfaff, "
+ "Christoph Bartelmus, Andrei Tanas");
+MODULE_LICENSE("GPL");
+
+module_param(type, int, 0444);
+#if defined(LIRC_SERIAL_NSLU2)
+MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo,"
+ " 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug,"
+ " 5 = NSLU2 RX:CTS2/TX:GreenLED)");
+#else
+MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo,"
+ " 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug)");
+#endif
+
+module_param(io, int, 0444);
+MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
+
+#if defined(LIRC_ALLOW_MMAPPED_IO)
+/* some architectures (e.g. intel xscale) have memory mapped registers */
+module_param(iommap, bool, 0444);
+MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O"
+ " (0 = no memory mapped io)");
+
+/* some architectures (e.g. intel xscale) align the 8bit serial registers
+ on 32bit word boundaries.
+ See linux-kernel/serial/8250.c serial_in()/out() */
+module_param(ioshift, int, 0444);
+MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");
+#endif
+
+module_param(irq, int, 0444);
+MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
+
+module_param(share_irq, bool, 0444);
+MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)");
+
+module_param(sense, bool, 0444);
+MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
+ " (0 = active high, 1 = active low )");
+
+#ifdef LIRC_SERIAL_TRANSMITTER
+module_param(txsense, bool, 0444);
+MODULE_PARM_DESC(txsense, "Sense of transmitter circuit"
+ " (0 = active high, 1 = active low )");
+#endif
+
+module_param(softcarrier, bool, 0444);
+MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on)");
+
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Enable debugging messages");
+
+#endif /* MODULE */
--
1.6.0.1


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