| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20100726233145.GK21225@redhat.com>
Date: Mon, 26 Jul 2010 19:31:45 -0400
From: Jarod Wilson <jarod@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-media@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH 10/15] staging/lirc: add lirc_serial driver
Signed-off-by: Jarod Wilson <jarod@...hat.com>
---
drivers/staging/lirc/lirc_serial.c | 1313 ++++++++++++++++++++++++++++++++++++
1 files changed, 1313 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/lirc/lirc_serial.c
diff --git a/drivers/staging/lirc/lirc_serial.c b/drivers/staging/lirc/lirc_serial.c
new file mode 100644
index 0000000..d2ea3f0
--- /dev/null
+++ b/drivers/staging/lirc/lirc_serial.c
@@ -0,0 +1,1313 @@
+/*
+ * 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@....uni-koeln.de>
+ * Copyright (C) 1998 Trent Piepho <xyzzy@...ashington.edu>
+ * Copyright (C) 1998 Ben Pfaff <blp@....org>
+ * Copyright (C) 1999 Christoph Bartelmus <lirc@...telmus.de>
+ * Copyright (C) 2007 Andrei Tanas <andrei@...as.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@...iesfam.org> July 2001
+ */
+
+#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/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/io.h>
+#include <linux/irq.h>
+#include <linux/fcntl.h>
+#include <linux/spinlock.h>
+
+#ifdef CONFIG_LIRC_SERIAL_NSLU2
+#include <asm/hardware.h>
+#endif
+/* 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 */
+
+#include <media/lirc.h>
+#include <media/lirc_dev.h>
+
+#define LIRC_DRIVER_NAME "lirc_serial"
+
+struct lirc_serial {
+ int signal_pin;
+ int signal_pin_change;
+ u8 on;
+ u8 off;
+ long (*send_pulse)(unsigned long length);
+ void (*send_space)(long length);
+ int features;
+ spinlock_t lock;
+};
+
+#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
+
+/*** module parameters ***/
+static int type;
+static int io;
+static int irq;
+static int iommap;
+static int ioshift;
+static int softcarrier = 1;
+static int share_irq;
+static int debug;
+static int sense = -1; /* -1 = auto, 0 = active high, 1 = active low */
+static int txsense; /* 0 = active high, 1 = active low */
+
+#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[] = {
+ [LIRC_HOMEBREW] = {
+ .signal_pin = UART_MSR_DCD,
+ .signal_pin_change = UART_MSR_DDCD,
+ .on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
+ .off = (UART_MCR_RTS | UART_MCR_OUT2),
+ .send_pulse = send_pulse_homebrew,
+ .send_space = send_space_homebrew,
+#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
+ .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
+ LIRC_CAN_SET_SEND_CARRIER |
+ LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
+#else
+ .features = LIRC_CAN_REC_MODE2
+#endif
+ },
+
+ [LIRC_IRDEO] = {
+ .signal_pin = UART_MSR_DSR,
+ .signal_pin_change = UART_MSR_DDSR,
+ .on = UART_MCR_OUT2,
+ .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
+ .send_pulse = send_pulse_irdeo,
+ .send_space = send_space_irdeo,
+ .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
+ LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
+ },
+
+ [LIRC_IRDEO_REMOTE] = {
+ .signal_pin = UART_MSR_DSR,
+ .signal_pin_change = UART_MSR_DDSR,
+ .on = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
+ .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
+ .send_pulse = send_pulse_irdeo,
+ .send_space = send_space_irdeo,
+ .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
+ LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
+ },
+
+ [LIRC_ANIMAX] = {
+ .signal_pin = UART_MSR_DCD,
+ .signal_pin_change = UART_MSR_DDCD,
+ .on = 0,
+ .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
+ .send_pulse = NULL,
+ .send_space = NULL,
+ .features = LIRC_CAN_REC_MODE2
+ },
+
+ [LIRC_IGOR] = {
+ .signal_pin = UART_MSR_DSR,
+ .signal_pin_change = UART_MSR_DDSR,
+ .on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
+ .off = (UART_MCR_RTS | UART_MCR_OUT2),
+ .send_pulse = send_pulse_homebrew,
+ .send_space = send_space_homebrew,
+#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
+ .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
+ LIRC_CAN_SET_SEND_CARRIER |
+ LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
+#else
+ .features = LIRC_CAN_REC_MODE2
+#endif
+ },
+
+#ifdef CONFIG_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@...bl.net>).
+ * See also http://www.nslu2-linux.org for this device
+ */
+ [LIRC_NSLU2] = {
+ .signal_pin = UART_MSR_CTS,
+ .signal_pin_change = UART_MSR_DCTS,
+ .on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
+ .off = (UART_MCR_RTS | UART_MCR_OUT2),
+ .send_pulse = send_pulse_homebrew,
+ .send_space = send_space_homebrew,
+#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
+ .features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
+ LIRC_CAN_SET_SEND_CARRIER |
+ LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
+#else
+ .features = LIRC_CAN_REC_MODE2
+#endif
+ },
+#endif
+
+};
+
+#define RS_ISR_PASS_LIMIT 256
+
+/*
+ * A long pulse code from a remote might take up to 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
+
+static struct timeval lasttv = {0, 0};
+
+static struct lirc_buffer rbuf;
+
+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@....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__ */
+/*
+ * FIXME: should we be using hrtimers instead of this
+ * LIRC_SERIAL_TRANSMITTER_LATENCY nonsense?
+ */
+
+/* fetch serial input packet (1 byte) from register offset */
+static u8 sinp(int offset)
+{
+ if (iommap != 0)
+ /* the register is memory-mapped */
+ offset <<= ioshift;
+
+ return inb(io + offset);
+}
+
+/* write serial output packet (1 byte) of value to register offset */
+static void soutp(int offset, u8 value)
+{
+ if (iommap != 0)
+ /* the register is memory-mapped */
+ offset <<= ioshift;
+
+ outb(value, io + offset);
+}
+
+static void on(void)
+{
+#ifdef CONFIG_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, IXP4XX_GPIO_LOW);
+ return;
+ }
+#endif
+ if (txsense)
+ soutp(UART_MCR, hardware[type].off);
+ else
+ soutp(UART_MCR, hardware[type].on);
+}
+
+static void off(void)
+{
+#ifdef CONFIG_LIRC_SERIAL_NSLU2
+ if (type == LIRC_NSLU2) {
+ gpio_line_set(NSLU2_LED_GRN, 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 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 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 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, ret;
+ 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)
+ ret = (-rawbits) * 10000 / 1152;
+ else
+ ret = (3 - i) * 3 * 10000 / 1152 + (-rawbits) * 10000 / 1152;
+
+ return ret;
+}
+
+#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 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;
+ /*
+ * FIXME: This looks like a hard busy wait, without even an occasional,
+ * polite, cpu_relax() call. There's got to be a better way?
+ *
+ * The i2c code has the result of a lot of bit-banging work, I wonder if
+ * there's something there which could be helpful here.
+ */
+ 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 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 void rbwrite(int l)
+{
+ if (lirc_buffer_full(&rbuf)) {
+ /* no new signals will be accepted */
+ dprintk("Buffer overrun\n");
+ return;
+ }
+ lirc_buffer_write(&rbuf, (void *)&l);
+}
+
+static 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 counter, dcd;
+ u8 status;
+ long deltv;
+ int data;
+ static int last_dcd = -1;
+
+ if ((sinp(UART_IIR) & UART_IIR_NO_INT)) {
+ /* not our interrupt */
+ return 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@...ashington.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.
+ */
+
+ /* calc 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_HANDLED;
+}
+
+
+static int hardware_init_port(void)
+{
+ u8 scratch, scratch2, scratch3;
+
+ /*
+ * This is a simple port existence test, borrowed from the autoconfig
+ * function in drivers/serial/8250.c
+ */
+ scratch = sinp(UART_IER);
+ soutp(UART_IER, 0);
+#ifdef __i386__
+ outb(0xff, 0x080);
+#endif
+ scratch2 = sinp(UART_IER) & 0x0f;
+ soutp(UART_IER, 0x0f);
+#ifdef __i386__
+ outb(0x00, 0x080);
+#endif
+ scratch3 = sinp(UART_IER) & 0x0f;
+ soutp(UART_IER, scratch);
+ if (scratch2 != 0 || scratch3 != 0x0f) {
+ /* we fail, there's nothing here */
+ printk(KERN_ERR LIRC_DRIVER_NAME ": port existence test "
+ "failed, cannot continue\n");
+ return -EINVAL;
+ }
+
+
+
+ /* 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);
+
+#ifdef CONFIG_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 = interrupt 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;
+ }
+
+ return 0;
+}
+
+static int init_port(void)
+{
+ int i, nlow, nhigh;
+
+ /* Reserve io region. */
+ /*
+ * 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))) {
+ 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;
+ }
+
+ if (hardware_init_port() < 0)
+ return -EINVAL;
+
+ /* 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 */
+ msleep(500);
+
+ /*
+ * 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++;
+ msleep(40);
+ }
+ 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;
+
+ /* 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);
+ return -EBUSY;
+ case -EINVAL:
+ printk(KERN_ERR LIRC_DRIVER_NAME
+ ": Bad irq number or handler\n");
+ return -EINVAL;
+ default:
+ dprintk("Interrupt %d, port %04x obtained\n", irq, io);
+ break;
+ };
+
+ spin_lock_irqsave(&hardware[type].lock, flags);
+
+ /* Set DLAB 0. */
+ soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+ soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
+
+ spin_unlock_irqrestore(&hardware[type].lock, flags);
+
+ return 0;
+}
+
+static void set_use_dec(void *data)
+{ unsigned long flags;
+
+ spin_lock_irqsave(&hardware[type].lock, 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)));
+ spin_unlock_irqrestore(&hardware[type].lock, flags);
+
+ free_irq(irq, (void *)&hardware);
+
+ dprintk("freed IRQ %d\n", irq);
+}
+
+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;
+ int *wbuf;
+
+ if (!(hardware[type].features & LIRC_CAN_SEND_PULSE))
+ return -EBADF;
+
+ count = n / sizeof(int);
+ if (n % sizeof(int) || count % 2 == 0)
+ return -EINVAL;
+ wbuf = memdup_user(buf, n);
+ if (PTR_ERR(wbuf))
+ return PTR_ERR(wbuf);
+ spin_lock_irqsave(&hardware[type].lock, 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();
+ spin_unlock_irqrestore(&hardware[type].lock, flags);
+ return n;
+}
+
+static long lirc_ioctl(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 lirc_dev_fop_ioctl(filep, cmd, arg);
+ }
+ return 0;
+}
+
+static struct file_operations lirc_fops = {
+ .owner = THIS_MODULE,
+ .write = lirc_write,
+ .unlocked_ioctl = lirc_ioctl,
+ .read = lirc_dev_fop_read,
+ .poll = lirc_dev_fop_poll,
+ .open = lirc_dev_fop_open,
+ .release = lirc_dev_fop_close,
+};
+
+static struct lirc_driver driver = {
+ .name = LIRC_DRIVER_NAME,
+ .minor = -1,
+ .code_length = 1,
+ .sample_rate = 0,
+ .data = NULL,
+ .add_to_buf = NULL,
+ .rbuf = &rbuf,
+ .set_use_inc = set_use_inc,
+ .set_use_dec = set_use_dec,
+ .fops = &lirc_fops,
+ .dev = NULL,
+ .owner = THIS_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;
+}
+
+/* twisty maze... need a forward-declaration here... */
+static void lirc_serial_exit(void);
+
+static int lirc_serial_resume(struct platform_device *dev)
+{
+ unsigned long flags;
+
+ if (hardware_init_port() < 0) {
+ lirc_serial_exit();
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&hardware[type].lock, flags);
+ /* Enable Interrupt */
+ do_gettimeofday(&lasttv);
+ soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
+ off();
+
+ lirc_buffer_clear(&rbuf);
+
+ spin_unlock_irqrestore(&hardware[type].lock, 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;
+
+ /* Init read buffer. */
+ result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
+ if (result < 0)
+ return -ENOMEM;
+
+ result = platform_driver_register(&lirc_serial_driver);
+ if (result) {
+ printk("lirc register returned %d\n", result);
+ goto exit_buffer_free;
+ }
+
+ 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);
+exit_buffer_free:
+ lirc_buffer_free(&rbuf);
+ return result;
+}
+
+static void lirc_serial_exit(void)
+{
+ platform_device_unregister(lirc_serial_dev);
+ platform_driver_unregister(&lirc_serial_driver);
+ lirc_buffer_free(&rbuf);
+}
+
+static int __init lirc_serial_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 nothing specified, use ttyS0/com1 and irq 4 */
+ io = io ? io : 0x3f8;
+ irq = irq ? irq : 4;
+ break;
+#ifdef CONFIG_LIRC_SERIAL_NSLU2
+ case LIRC_NSLU2:
+ io = io ? io : IRQ_IXP4XX_UART2;
+ irq = irq ? irq : (IXP4XX_UART2_BASE_VIRT + REG_OFFSET);
+ iommap = iommap ? iommap : IXP4XX_UART2_BASE_PHYS;
+ ioshift = ioshift ? ioshift : 2;
+ break;
+#endif
+ default:
+ result = -EINVAL;
+ goto exit_serial_exit;
+ }
+ if (!softcarrier) {
+ switch (type) {
+ case LIRC_HOMEBREW:
+ case LIRC_IGOR:
+#ifdef CONFIG_LIRC_SERIAL_NSLU2
+ case LIRC_NSLU2:
+#endif
+ 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;
+ driver.features = hardware[type].features;
+ driver.dev = &lirc_serial_dev->dev;
+ driver.minor = lirc_register_driver(&driver);
+ if (driver.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;
+}
+
+static void __exit lirc_serial_exit_module(void)
+{
+ lirc_serial_exit();
+ if (iommap != 0)
+ release_mem_region(iommap, 8 << ioshift);
+ else
+ release_region(io, 8);
+ lirc_unregister_driver(driver.minor);
+ dprintk("cleaned up module\n");
+}
+
+
+module_init(lirc_serial_init_module);
+module_exit(lirc_serial_exit_module);
+
+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, S_IRUGO);
+MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo,"
+ " 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug,"
+ " 5 = NSLU2 RX:CTS2/TX:GreenLED)");
+
+module_param(io, int, S_IRUGO);
+MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
+
+/* some architectures (e.g. intel xscale) have memory mapped registers */
+module_param(iommap, bool, S_IRUGO);
+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, S_IRUGO);
+MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");
+
+module_param(irq, int, S_IRUGO);
+MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
+
+module_param(share_irq, bool, S_IRUGO);
+MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)");
+
+module_param(sense, bool, S_IRUGO);
+MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
+ " (0 = active high, 1 = active low )");
+
+#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
+module_param(txsense, bool, S_IRUGO);
+MODULE_PARM_DESC(txsense, "Sense of transmitter circuit"
+ " (0 = active high, 1 = active low )");
+#endif
+
+module_param(softcarrier, bool, S_IRUGO);
+MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable debugging messages");
--
1.7.1.1
--
Jarod Wilson
jarod@...hat.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists