Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * serial_ir.c
 *
 * serial_ir - 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)
 * Copyright (C) 2016 Sean Young <sean@mess.org> (port to rc-core)
 */
 
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/serial_reg.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <media/rc-core.h>
 
struct serial_ir_hw {
<------>int signal_pin;
<------>int signal_pin_change;
<------>u8 on;
<------>u8 off;
<------>unsigned set_send_carrier:1;
<------>unsigned set_duty_cycle:1;
<------>void (*send_pulse)(unsigned int length, ktime_t edge);
<------>void (*send_space)(void);
<------>spinlock_t lock;
};
 
#define IR_HOMEBREW	0
#define IR_IRDEO	1
#define IR_IRDEO_REMOTE	2
#define IR_ANIMAX	3
#define IR_IGOR		4
 
/* module parameters */
static int type;
static int io;
static int irq;
static ulong iommap;
static int ioshift;
static bool softcarrier = true;
static bool share_irq;
static int sense = -1;	/* -1 = auto, 0 = active high, 1 = active low */
static bool txsense;	/* 0 = active high, 1 = active low */
 
/* forward declarations */
static void send_pulse_irdeo(unsigned int length, ktime_t edge);
static void send_space_irdeo(void);
#ifdef CONFIG_IR_SERIAL_TRANSMITTER
static void send_pulse_homebrew(unsigned int length, ktime_t edge);
static void send_space_homebrew(void);
#endif
 
static struct serial_ir_hw hardware[] = {
<------>[IR_HOMEBREW] = {
<------><------>.lock = __SPIN_LOCK_UNLOCKED(hardware[IR_HOMEBREW].lock),
<------><------>.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),
#ifdef CONFIG_IR_SERIAL_TRANSMITTER
<------><------>.send_pulse = send_pulse_homebrew,
<------><------>.send_space = send_space_homebrew,
<------><------>.set_send_carrier = true,
<------><------>.set_duty_cycle = true,
#endif
<------>},
 
<------>[IR_IRDEO] = {
<------><------>.lock = __SPIN_LOCK_UNLOCKED(hardware[IR_IRDEO].lock),
<------><------>.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,
<------><------>.set_duty_cycle = true,
<------>},
 
<------>[IR_IRDEO_REMOTE] = {
<------><------>.lock = __SPIN_LOCK_UNLOCKED(hardware[IR_IRDEO_REMOTE].lock),
<------><------>.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,
<------><------>.set_duty_cycle = true,
<------>},
 
<------>[IR_ANIMAX] = {
<------><------>.lock = __SPIN_LOCK_UNLOCKED(hardware[IR_ANIMAX].lock),
<------><------>.signal_pin	   = UART_MSR_DCD,
<------><------>.signal_pin_change = UART_MSR_DDCD,
<------><------>.on  = 0,
<------><------>.off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
<------>},
 
<------>[IR_IGOR] = {
<------><------>.lock = __SPIN_LOCK_UNLOCKED(hardware[IR_IGOR].lock),
<------><------>.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),
#ifdef CONFIG_IR_SERIAL_TRANSMITTER
<------><------>.send_pulse = send_pulse_homebrew,
<------><------>.send_space = send_space_homebrew,
<------><------>.set_send_carrier = true,
<------><------>.set_duty_cycle = true,
#endif
<------>},
};
 
#define RS_ISR_PASS_LIMIT 256
 
struct serial_ir {
<------>ktime_t lastkt;
<------>struct rc_dev *rcdev;
<------>struct platform_device *pdev;
<------>struct timer_list timeout_timer;
 
<------>unsigned int carrier;
<------>unsigned int duty_cycle;
};
 
static struct serial_ir serial_ir;
 
/* fetch serial input packet (1 byte) from register offset */
static u8 sinp(int offset)
{
<------>if (iommap)
<------><------>/* 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)
<------><------>/* the register is memory-mapped */
<------><------>offset <<= ioshift;
 
<------>outb(value, io + offset);
}
 
static void on(void)
{
<------>if (txsense)
<------><------>soutp(UART_MCR, hardware[type].off);
<------>else
<------><------>soutp(UART_MCR, hardware[type].on);
}
 
static void off(void)
{
<------>if (txsense)
<------><------>soutp(UART_MCR, hardware[type].on);
<------>else
<------><------>soutp(UART_MCR, hardware[type].off);
}
 
static void send_pulse_irdeo(unsigned int length, ktime_t target)
{
<------>long rawbits;
<------>int i;
<------>unsigned char output;
<------>unsigned char chunk, shifted;
 
<------>/* how many bits have to be sent ? */
<------>rawbits = length * 1152 / 10000;
<------>if (serial_ir.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))
<------><------><------>;
<------>}
}
 
static void send_space_irdeo(void)
{
}
 
#ifdef CONFIG_IR_SERIAL_TRANSMITTER
static void send_pulse_homebrew_softcarrier(unsigned int length, ktime_t edge)
{
<------>ktime_t now, target = ktime_add_us(edge, length);
<------>/*
<------> * delta should never exceed 4 seconds and on m68k
<------> * ndelay(s64) does not compile; so use s32 rather than s64.
<------> */
<------>s32 delta;
<------>unsigned int pulse, space;
 
<------>/* Ensure the dividend fits into 32 bit */
<------>pulse = DIV_ROUND_CLOSEST(serial_ir.duty_cycle * (NSEC_PER_SEC / 100),
<------><------><------><------>  serial_ir.carrier);
<------>space = DIV_ROUND_CLOSEST((100 - serial_ir.duty_cycle) *
<------><------><------><------>  (NSEC_PER_SEC / 100), serial_ir.carrier);
 
<------>for (;;) {
<------><------>now = ktime_get();
<------><------>if (ktime_compare(now, target) >= 0)
<------><------><------>break;
<------><------>on();
<------><------>edge = ktime_add_ns(edge, pulse);
<------><------>delta = ktime_to_ns(ktime_sub(edge, now));
<------><------>if (delta > 0)
<------><------><------>ndelay(delta);
<------><------>now = ktime_get();
<------><------>off();
<------><------>if (ktime_compare(now, target) >= 0)
<------><------><------>break;
<------><------>edge = ktime_add_ns(edge, space);
<------><------>delta = ktime_to_ns(ktime_sub(edge, now));
<------><------>if (delta > 0)
<------><------><------>ndelay(delta);
<------>}
}
 
static void send_pulse_homebrew(unsigned int length, ktime_t edge)
{
<------>if (softcarrier)
<------><------>send_pulse_homebrew_softcarrier(length, edge);
<------>else
<------><------>on();
}
 
static void send_space_homebrew(void)
{
<------>off();
}
#endif
 
static void frbwrite(unsigned int l, bool is_pulse)
{
<------>/* simple noise filter */
<------>static unsigned int ptr, pulse, space;
<------>struct ir_raw_event ev = {};
 
<------>if (ptr > 0 && is_pulse) {
<------><------>pulse += l;
<------><------>if (pulse > 250) {
<------><------><------>ev.duration = space;
<------><------><------>ev.pulse = false;
<------><------><------>ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
<------><------><------>ev.duration = pulse;
<------><------><------>ev.pulse = true;
<------><------><------>ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
<------><------><------>ptr = 0;
<------><------><------>pulse = 0;
<------><------>}
<------><------>return;
<------>}
<------>if (!is_pulse) {
<------><------>if (ptr == 0) {
<------><------><------>if (l > 20000) {
<------><------><------><------>space = l;
<------><------><------><------>ptr++;
<------><------><------><------>return;
<------><------><------>}
<------><------>} else {
<------><------><------>if (l > 20000) {
<------><------><------><------>space += pulse;
<------><------><------><------>if (space > IR_MAX_DURATION)
<------><------><------><------><------>space = IR_MAX_DURATION;
<------><------><------><------>space += l;
<------><------><------><------>if (space > IR_MAX_DURATION)
<------><------><------><------><------>space = IR_MAX_DURATION;
<------><------><------><------>pulse = 0;
<------><------><------><------>return;
<------><------><------>}
 
<------><------><------>ev.duration = space;
<------><------><------>ev.pulse = false;
<------><------><------>ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
<------><------><------>ev.duration = pulse;
<------><------><------>ev.pulse = true;
<------><------><------>ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
<------><------><------>ptr = 0;
<------><------><------>pulse = 0;
<------><------>}
<------>}
 
<------>ev.duration = l;
<------>ev.pulse = is_pulse;
<------>ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
}
 
static irqreturn_t serial_ir_irq_handler(int i, void *blah)
{
<------>ktime_t kt;
<------>int counter, dcd;
<------>u8 status;
<------>ktime_t delkt;
<------>unsigned 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) {
<------><------><------>dev_err(&serial_ir.pdev->dev, "Trapped in interrupt");
<------><------><------>break;
<------><------>}
<------><------>if ((status & hardware[type].signal_pin_change) &&
<------><------>    sense != -1) {
<------><------><------>/* get current time */
<------><------><------>kt = ktime_get();
 
<------><------><------>/*
<------><------><------> * The driver needs to know if your receiver is
<------><------><------> * active high or active low, or the space/pulse
<------><------><------> * sense could be inverted.
<------><------><------> */
 
<------><------><------>/* calc time since last interrupt in nanoseconds */
<------><------><------>dcd = (status & hardware[type].signal_pin) ? 1 : 0;
 
<------><------><------>if (dcd == last_dcd) {
<------><------><------><------>dev_dbg(&serial_ir.pdev->dev,
<------><------><------><------><------>"ignoring spike: %d %d %lldns %lldns\n",
<------><------><------><------><------>dcd, sense, ktime_to_ns(kt),
<------><------><------><------><------>ktime_to_ns(serial_ir.lastkt));
<------><------><------><------>continue;
<------><------><------>}
 
<------><------><------>delkt = ktime_sub(kt, serial_ir.lastkt);
<------><------><------>if (ktime_compare(delkt, ktime_set(15, 0)) > 0) {
<------><------><------><------>data = IR_MAX_DURATION; /* really long time */
<------><------><------><------>if (!(dcd ^ sense)) {
<------><------><------><------><------>/* sanity check */
<------><------><------><------><------>dev_err(&serial_ir.pdev->dev,
<------><------><------><------><------><------>"dcd unexpected: %d %d %lldns %lldns\n",
<------><------><------><------><------><------>dcd, sense, ktime_to_ns(kt),
<------><------><------><------><------><------>ktime_to_ns(serial_ir.lastkt));
<------><------><------><------><------>/*
<------><------><------><------><------> * detecting pulse while this
<------><------><------><------><------> * MUST be a space!
<------><------><------><------><------> */
<------><------><------><------><------>sense = sense ? 0 : 1;
<------><------><------><------>}
<------><------><------>} else {
<------><------><------><------>data = ktime_to_us(delkt);
<------><------><------>}
<------><------><------>frbwrite(data, !(dcd ^ sense));
<------><------><------>serial_ir.lastkt = kt;
<------><------><------>last_dcd = dcd;
<------><------>}
<------>} while (!(sinp(UART_IIR) & UART_IIR_NO_INT)); /* still pending ? */
 
<------>mod_timer(&serial_ir.timeout_timer,
<------><------>  jiffies + usecs_to_jiffies(serial_ir.rcdev->timeout));
 
<------>ir_raw_event_handle(serial_ir.rcdev);
 
<------>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/tty/serial/8250/8250_port.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 */
<------><------>pr_err("port existence test failed, cannot continue\n");
<------><------>return -ENODEV;
<------>}
 
<------>/* 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);
 
<------>/* 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 IR_IRDEO:
<------>case IR_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 void serial_ir_timeout(struct timer_list *unused)
{
<------>struct ir_raw_event ev = {
<------><------>.timeout = true,
<------><------>.duration = serial_ir.rcdev->timeout
<------>};
<------>ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
<------>ir_raw_event_handle(serial_ir.rcdev);
}
 
/* Needed by serial_ir_probe() */
static int serial_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
<------><------><------>unsigned int count);
static int serial_ir_tx_duty_cycle(struct rc_dev *dev, u32 cycle);
static int serial_ir_tx_carrier(struct rc_dev *dev, u32 carrier);
static int serial_ir_open(struct rc_dev *rcdev);
static void serial_ir_close(struct rc_dev *rcdev);
 
static int serial_ir_probe(struct platform_device *dev)
{
<------>struct rc_dev *rcdev;
<------>int i, nlow, nhigh, result;
 
<------>rcdev = devm_rc_allocate_device(&dev->dev, RC_DRIVER_IR_RAW);
<------>if (!rcdev)
<------><------>return -ENOMEM;
 
<------>if (hardware[type].send_pulse && hardware[type].send_space)
<------><------>rcdev->tx_ir = serial_ir_tx;
<------>if (hardware[type].set_send_carrier)
<------><------>rcdev->s_tx_carrier = serial_ir_tx_carrier;
<------>if (hardware[type].set_duty_cycle)
<------><------>rcdev->s_tx_duty_cycle = serial_ir_tx_duty_cycle;
 
<------>switch (type) {
<------>case IR_HOMEBREW:
<------><------>rcdev->device_name = "Serial IR type home-brew";
<------><------>break;
<------>case IR_IRDEO:
<------><------>rcdev->device_name = "Serial IR type IRdeo";
<------><------>break;
<------>case IR_IRDEO_REMOTE:
<------><------>rcdev->device_name = "Serial IR type IRdeo remote";
<------><------>break;
<------>case IR_ANIMAX:
<------><------>rcdev->device_name = "Serial IR type AnimaX";
<------><------>break;
<------>case IR_IGOR:
<------><------>rcdev->device_name = "Serial IR type IgorPlug";
<------><------>break;
<------>}
 
<------>rcdev->input_phys = KBUILD_MODNAME "/input0";
<------>rcdev->input_id.bustype = BUS_HOST;
<------>rcdev->input_id.vendor = 0x0001;
<------>rcdev->input_id.product = 0x0001;
<------>rcdev->input_id.version = 0x0100;
<------>rcdev->open = serial_ir_open;
<------>rcdev->close = serial_ir_close;
<------>rcdev->dev.parent = &serial_ir.pdev->dev;
<------>rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
<------>rcdev->driver_name = KBUILD_MODNAME;
<------>rcdev->map_name = RC_MAP_RC6_MCE;
<------>rcdev->min_timeout = 1;
<------>rcdev->timeout = IR_DEFAULT_TIMEOUT;
<------>rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
<------>rcdev->rx_resolution = 250;
 
<------>serial_ir.rcdev = rcdev;
 
<------>timer_setup(&serial_ir.timeout_timer, serial_ir_timeout, 0);
 
<------>result = devm_request_irq(&dev->dev, irq, serial_ir_irq_handler,
<------><------><------><------>  share_irq ? IRQF_SHARED : 0,
<------><------><------><------>  KBUILD_MODNAME, &hardware);
<------>if (result < 0) {
<------><------>if (result == -EBUSY)
<------><------><------>dev_err(&dev->dev, "IRQ %d busy\n", irq);
<------><------>else if (result == -EINVAL)
<------><------><------>dev_err(&dev->dev, "Bad irq number or handler\n");
<------><------>return result;
<------>}
 
<------>/* Reserve io region. */
<------>if ((iommap &&
<------>     (devm_request_mem_region(&dev->dev, iommap, 8UL << ioshift,
<------><------><------><------>      KBUILD_MODNAME) == NULL)) ||
<------>     (!iommap && (devm_request_region(&dev->dev, io, 8,
<------><------><------>  KBUILD_MODNAME) == NULL))) {
<------><------>dev_err(&dev->dev, "port %04x already in use\n", io);
<------><------>dev_warn(&dev->dev, "use 'setserial /dev/ttySX uart none'\n");
<------><------>dev_warn(&dev->dev,
<------><------><------> "or compile the serial port driver as module and\n");
<------><------>dev_warn(&dev->dev, "make sure this module is loaded first\n");
<------><------>return -EBUSY;
<------>}
 
<------>result = hardware_init_port();
<------>if (result < 0)
<------><------>return result;
 
<------>/* Initialize pulse/space widths */
<------>serial_ir.duty_cycle = 50;
<------>serial_ir.carrier = 38000;
 
<------>/* 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;
<------><------>dev_info(&dev->dev, "auto-detected active %s receiver\n",
<------><------><------> sense ? "low" : "high");
<------>} else
<------><------>dev_info(&dev->dev, "Manually using active %s receiver\n",
<------><------><------> sense ? "low" : "high");
 
<------>dev_dbg(&dev->dev, "Interrupt %d, port %04x obtained\n", irq, io);
 
<------>return devm_rc_register_device(&dev->dev, rcdev);
}
 
static int serial_ir_open(struct rc_dev *rcdev)
{
<------>unsigned long flags;
 
<------>/* initialize timestamp */
<------>serial_ir.lastkt = ktime_get();
 
<------>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 serial_ir_close(struct rc_dev *rcdev)
{
<------>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 int serial_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
<------><------><------>unsigned int count)
{
<------>unsigned long flags;
<------>ktime_t edge;
<------>s64 delta;
<------>int i;
 
<------>spin_lock_irqsave(&hardware[type].lock, flags);
<------>if (type == IR_IRDEO) {
<------><------>/* DTR, RTS down */
<------><------>on();
<------>}
 
<------>edge = ktime_get();
<------>for (i = 0; i < count; i++) {
<------><------>if (i % 2)
<------><------><------>hardware[type].send_space();
<------><------>else
<------><------><------>hardware[type].send_pulse(txbuf[i], edge);
 
<------><------>edge = ktime_add_us(edge, txbuf[i]);
<------><------>delta = ktime_us_delta(edge, ktime_get());
<------><------>if (delta > 25) {
<------><------><------>spin_unlock_irqrestore(&hardware[type].lock, flags);
<------><------><------>usleep_range(delta - 25, delta + 25);
<------><------><------>spin_lock_irqsave(&hardware[type].lock, flags);
<------><------>} else if (delta > 0) {
<------><------><------>udelay(delta);
<------><------>}
<------>}
<------>off();
<------>spin_unlock_irqrestore(&hardware[type].lock, flags);
<------>return count;
}
 
static int serial_ir_tx_duty_cycle(struct rc_dev *dev, u32 cycle)
{
<------>serial_ir.duty_cycle = cycle;
<------>return 0;
}
 
static int serial_ir_tx_carrier(struct rc_dev *dev, u32 carrier)
{
<------>if (carrier > 500000 || carrier < 20000)
<------><------>return -EINVAL;
 
<------>serial_ir.carrier = carrier;
<------>return 0;
}
 
static int serial_ir_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 serial_ir_resume(struct platform_device *dev)
{
<------>unsigned long flags;
<------>int result;
 
<------>result = hardware_init_port();
<------>if (result < 0)
<------><------>return result;
 
<------>spin_lock_irqsave(&hardware[type].lock, flags);
<------>/* Enable Interrupt */
<------>serial_ir.lastkt = ktime_get();
<------>soutp(UART_IER, sinp(UART_IER) | UART_IER_MSI);
<------>off();
 
<------>spin_unlock_irqrestore(&hardware[type].lock, flags);
 
<------>return 0;
}
 
static struct platform_driver serial_ir_driver = {
<------>.probe		= serial_ir_probe,
<------>.suspend	= serial_ir_suspend,
<------>.resume		= serial_ir_resume,
<------>.driver		= {
<------><------>.name	= "serial_ir",
<------>},
};
 
static int __init serial_ir_init(void)
{
<------>int result;
 
<------>result = platform_driver_register(&serial_ir_driver);
<------>if (result)
<------><------>return result;
 
<------>serial_ir.pdev = platform_device_alloc("serial_ir", 0);
<------>if (!serial_ir.pdev) {
<------><------>result = -ENOMEM;
<------><------>goto exit_driver_unregister;
<------>}
 
<------>result = platform_device_add(serial_ir.pdev);
<------>if (result)
<------><------>goto exit_device_put;
 
<------>return 0;
 
exit_device_put:
<------>platform_device_put(serial_ir.pdev);
exit_driver_unregister:
<------>platform_driver_unregister(&serial_ir_driver);
<------>return result;
}
 
static void serial_ir_exit(void)
{
<------>platform_device_unregister(serial_ir.pdev);
<------>platform_driver_unregister(&serial_ir_driver);
}
 
static int __init serial_ir_init_module(void)
{
<------>switch (type) {
<------>case IR_HOMEBREW:
<------>case IR_IRDEO:
<------>case IR_IRDEO_REMOTE:
<------>case IR_ANIMAX:
<------>case IR_IGOR:
<------><------>/* if nothing specified, use ttyS0/com1 and irq 4 */
<------><------>io = io ? io : 0x3f8;
<------><------>irq = irq ? irq : 4;
<------><------>break;
<------>default:
<------><------>return -EINVAL;
<------>}
<------>if (!softcarrier) {
<------><------>switch (type) {
<------><------>case IR_HOMEBREW:
<------><------>case IR_IGOR:
<------><------><------>hardware[type].set_send_carrier = false;
<------><------><------>hardware[type].set_duty_cycle = false;
<------><------><------>break;
<------><------>}
<------>}
 
<------>/* make sure sense is either -1, 0, or 1 */
<------>if (sense != -1)
<------><------>sense = !!sense;
 
<------>return serial_ir_init();
}
 
static void __exit serial_ir_exit_module(void)
{
<------>del_timer_sync(&serial_ir.timeout_timer);
<------>serial_ir_exit();
}
 
module_init(serial_ir_init_module);
module_exit(serial_ir_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, 0444);
MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo, 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug");
 
module_param_hw(io, int, ioport, 0444);
MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
 
/* some architectures (e.g. intel xscale) have memory mapped registers */
module_param_hw(iommap, ulong, other, 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/drivers/tty/serial/8250/8250.c serial_in()/out()
 */
module_param_hw(ioshift, int, other, 0444);
MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");
 
module_param_hw(irq, int, irq, 0444);
MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
 
module_param_hw(share_irq, bool, other, 0444);
MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)");
 
module_param(sense, int, 0444);
MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit (0 = active high, 1 = active low )");
 
#ifdef CONFIG_IR_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, default on)");