/drivers/staging/lirc/lirc_serial.c
https://bitbucket.org/slukk/jb-tsm-kernel-4.2 · C · 1309 lines · 894 code · 173 blank · 242 comment · 126 complexity · 0f151733e3064803b7849e733b4e735e MD5 · raw file
- /*
- * 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/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@goebl.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@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__ */
- /*
- * 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)
- {
- __u64 loops_per_sec, work;
- duty_cycle = new_duty_cycle;
- freq = new_freq;
- loops_per_sec = __this_cpu_read(cpu.info.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, __this_cpu_read(cpu_info.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@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.
- */
- /* 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 __devinit lirc_serial_probe(struct platform_device *dev)
- {
- int i, nlow, nhigh, result;
- result = request_irq(irq, irq_handler,
- IRQF_DISABLED | (share_irq ? IRQF_SHARED : 0),
- LIRC_DRIVER_NAME, (void *)&hardware);
- if (result < 0) {
- if (result == -EBUSY)
- printk(KERN_ERR LIRC_DRIVER_NAME ": IRQ %d busy\n",
- irq);
- else if (result == -EINVAL)
- printk(KERN_ERR LIRC_DRIVER_NAME
- ": Bad irq number or handler\n");
- return result;
- }
- /* 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");
- result = -EBUSY;
- goto exit_free_irq;
- }
- if (hardware_init_port() < 0) {
- result = -EINVAL;
- goto exit_release_region;
- }
- /* 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");
- dprintk("Interrupt %d, port %04x obtained\n", irq, io);
- return 0;
- exit_release_region:
- if (iommap != 0)
- release_mem_region(iommap, 8 << ioshift);
- else
- release_region(io, 8);
- exit_free_irq:
- free_irq(irq, (void *)&hardware);
- return result;
- }
- static int __devexit lirc_serial_remove(struct platform_device *dev)
- {
- free_irq(irq, (void *)&hardware);
- if (iommap != 0)
- release_mem_region(iommap, 8 << ioshift);
- else
- release_region(io, 8);
- return 0;
- }
- static int set_use_inc(void *data)
- {
- unsigned long flags;
- /* initialize timestamp */
- do_gettimeofday(&lasttv);
- 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);
- }
- 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 (IS_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);
- kfree(wbuf);
- return n;
- }
- static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
- {
- int result;
- __u32 value;
- 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),
- (__u32 *) 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, (__u32 *) 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(value, (__u32 *) arg);
- if (result)
- return result;
- if (value <= 0 || value > 100)
- return -EINVAL;
- return init_timing_params(value, 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(value, (__u32 *) arg);
- if (result)
- return result;
- if (value > 500000 || value < 20000)
- return -EINVAL;
- return init_timing_params(duty_cycle, value);
- break;
- default:
- return lirc_dev_fop_ioctl(filep, cmd, arg);
- }
- return 0;
- }
- static const struct file_operations lirc_fops = {
- .owner = THIS_MODULE,
- .write = lirc_write,
- .unlocked_ioctl = lirc_ioctl,
- #ifdef CONFIG_COMPAT
- .compat_ioctl = lirc_ioctl,
- #endif
- .read = lirc_dev_fop_read,
- .poll = lirc_dev_fop_poll,
- .open = lirc_dev_fop_open,
- .release = lirc_dev_fop_close,
- .llseek = no_llseek,
- };
- 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 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)
- 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;
- 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:
- return -EINVAL;
- }
- 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 = lirc_serial_init();
- if (result)
- return result;
- 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");
- lirc_serial_exit();
- return -EIO;
- }
- return 0;
- }
- static void __exit lirc_serial_exit_module(void)
- {
- lirc_unregister_driver(driver.minor);
- lirc_serial_exit();
- 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");