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lirc_it87.c

/*
 * LIRC driver for ITE IT8712/IT8705/IT8720 CIR port
 *
 * Copyright (C) 2001 Hans-Günter Lütke Uphues <hg_lu@web.de>
 *
 * 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
 *
 * ITE IT8705, IT8712(not tested) and IT8720 CIR-port support for lirc based
 * via cut and paste from lirc_sir.c (C) 2000 Milan Pikula
 *
 * Attention: Sendmode only tested with debugging logs
 *
 * 2001/02/27 Christoph Bartelmus <lirc@bartelmus.de> :
 *   reimplemented read function
 * 2005/06/05 Andrew Calkin implemented support for Asus Digimatrix,
 *   based on work of the following member of the Outertrack Digimatrix
 *   Forum: Art103 <r_tay@hotmail.com>
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <linux/version.h>
#include <linux/module.h>
#include <linux/autoconf.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/signal.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 <asm/system.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/fcntl.h>
#else
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/fcntl.h>
#endif

#include <linux/timer.h>

#include "../lirc.h"
#include "../lirc_dev/lirc_dev.h"
#include "../kcompat.h"

#include "lirc_it87.h"

#ifdef LIRC_IT87_DIGIMATRIX
static int digimatrix = 1;
static int it87_freq = 36; /* kHz */
static int irq = 9;
#else
static int digimatrix;
static int it87_freq = 38; /* kHz */
static int irq = IT87_CIR_DEFAULT_IRQ;
#endif

static unsigned long it87_bits_in_byte_out;
static unsigned long it87_send_counter;
static unsigned char it87_RXEN_mask = IT87_CIR_RCR_RXEN;

#define RBUF_LEN 1024
#define WBUF_LEN 1024

#define LIRC_DRIVER_NAME "lirc_it87"

/* timeout for sequences in jiffies (=5/100s) */
/* must be longer than TIME_CONST */
#define IT87_TIMEOUT    (HZ*5/100)

/* module parameters */
static int debug;
#define dprintk(fmt, args...)                         \
      do {                                      \
            if (debug)                          \
                  printk(KERN_DEBUG LIRC_DRIVER_NAME ": "   \
                         fmt, ## args);               \
      } while (0)

static int io = IT87_CIR_DEFAULT_IOBASE;
/* receiver demodulator default: off */
static int it87_enable_demodulator;

static int timer_enabled;
static DEFINE_SPINLOCK(timer_lock);
static struct timer_list timerlist;
/* time of last signal change detected */
static struct timeval last_tv = {0, 0};
/* time of last UART data ready interrupt */
static struct timeval last_intr_tv = {0, 0};
static int last_value;

static DECLARE_WAIT_QUEUE_HEAD(lirc_read_queue);

static DEFINE_SPINLOCK(hardware_lock);
static DEFINE_SPINLOCK(dev_lock);

static lirc_t rx_buf[RBUF_LEN];
unsigned int rx_tail, rx_head;
static lirc_t tx_buf[WBUF_LEN];

/* SECTION: Prototypes */

/* Communication with user-space */
static int lirc_open(struct inode *inode, struct file *file);
static int lirc_close(struct inode *inode, struct file *file);
static unsigned int lirc_poll(struct file *file, poll_table *wait);
static ssize_t lirc_read(struct file *file, char *buf,
                   size_t count, loff_t *ppos);
static ssize_t lirc_write(struct file *file, const char *buf,
                    size_t n, loff_t *pos);
static int lirc_ioctl(struct inode *node, struct file *filep,
                  unsigned int cmd, unsigned long arg);
static void add_read_queue(int flag, unsigned long val);
static int init_chrdev(void);
static void drop_chrdev(void);
      /* Hardware */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
static irqreturn_t it87_interrupt(int irq, void *dev_id,
                          struct pt_regs *regs);
#else
static irqreturn_t it87_interrupt(int irq, void *dev_id);
#endif
static void send_space(unsigned long len);
static void send_pulse(unsigned long len);
static void init_send(void);
static void terminate_send(unsigned long len);
static int init_hardware(void);
static void drop_hardware(void);
/* Initialisation */
static int init_port(void);
static void drop_port(void);


/* SECTION: Communication with user-space */

static int lirc_open(struct inode *inode, struct file *file)
{
      spin_lock(&dev_lock);
      if (MOD_IN_USE) {
            spin_unlock(&dev_lock);
            return -EBUSY;
      }
      MOD_INC_USE_COUNT;
      spin_unlock(&dev_lock);
      return 0;
}


static int lirc_close(struct inode *inode, struct file *file)
{
      MOD_DEC_USE_COUNT;
      return 0;
}


static unsigned int lirc_poll(struct file *file, poll_table *wait)
{
      poll_wait(file, &lirc_read_queue, wait);
      if (rx_head != rx_tail)
            return POLLIN | POLLRDNORM;
      return 0;
}


static ssize_t lirc_read(struct file *file, char *buf,
                   size_t count, loff_t *ppos)
{
      int n = 0;
      int retval = 0;

      while (n < count) {
            if (file->f_flags & O_NONBLOCK && rx_head == rx_tail) {
                  retval = -EAGAIN;
                  break;
            }
            retval = wait_event_interruptible(lirc_read_queue,
                                      rx_head != rx_tail);
            if (retval)
                  break;

            if (copy_to_user((void *) buf + n, (void *) (rx_buf + rx_head),
                         sizeof(lirc_t))) {
                  retval = -EFAULT;
                  break;
            }
            rx_head = (rx_head + 1) & (RBUF_LEN - 1);
            n += sizeof(lirc_t);
      }
      if (n)
            return n;
      return retval;
}


static ssize_t lirc_write(struct file *file, const char *buf,
                    size_t n, loff_t *pos)
{
      int i = 0;

      if (n % sizeof(lirc_t) || (n / sizeof(lirc_t)) > WBUF_LEN)
            return -EINVAL;
      if (copy_from_user(tx_buf, buf, n))
            return -EFAULT;
      n /= sizeof(lirc_t);
      init_send();
      while (1) {
            if (i >= n)
                  break;
            if (tx_buf[i])
                  send_pulse(tx_buf[i]);
            i++;
            if (i >= n)
                  break;
            if (tx_buf[i])
                  send_space(tx_buf[i]);
            i++;
      }
      terminate_send(tx_buf[i - 1]);
      return n;
}


static int lirc_ioctl(struct inode *node, struct file *filep,
                  unsigned int cmd, unsigned long arg)
{
      int retval = 0;
      unsigned long value = 0;
      unsigned int ivalue;
      unsigned long hw_flags;

      if (cmd == LIRC_GET_FEATURES)
            value = LIRC_CAN_SEND_PULSE |
                  LIRC_CAN_SET_SEND_CARRIER |
                  LIRC_CAN_REC_MODE2;
      else if (cmd == LIRC_GET_SEND_MODE)
            value = LIRC_MODE_PULSE;
      else if (cmd == LIRC_GET_REC_MODE)
            value = LIRC_MODE_MODE2;

      switch (cmd) {
      case LIRC_GET_FEATURES:
      case LIRC_GET_SEND_MODE:
      case LIRC_GET_REC_MODE:
            retval = put_user(value, (unsigned long *) arg);
            break;

      case LIRC_SET_SEND_MODE:
      case LIRC_SET_REC_MODE:
            retval = get_user(value, (unsigned long *) arg);
            break;

      case LIRC_SET_SEND_CARRIER:
            retval = get_user(ivalue, (unsigned int *) arg);
            if (retval)
                  return retval;
            ivalue /= 1000;
            if (ivalue > IT87_CIR_FREQ_MAX ||
                ivalue < IT87_CIR_FREQ_MIN)
                  return -EINVAL;

            it87_freq = ivalue;

            spin_lock_irqsave(&hardware_lock, hw_flags);
            outb(((inb(io + IT87_CIR_TCR2) & IT87_CIR_TCR2_TXMPW) |
                  (it87_freq - IT87_CIR_FREQ_MIN) << 3),
                  io + IT87_CIR_TCR2);
            spin_unlock_irqrestore(&hardware_lock, hw_flags);
            dprintk("demodulation frequency: %d kHz\n", it87_freq);

            break;

      default:
            retval = -EINVAL;
      }

      if (retval)
            return retval;

      if (cmd == LIRC_SET_REC_MODE) {
            if (value != LIRC_MODE_MODE2)
                  retval = -ENOSYS;
      } else if (cmd == LIRC_SET_SEND_MODE) {
            if (value != LIRC_MODE_PULSE)
                  retval = -ENOSYS;
      }
      return retval;
}

static void add_read_queue(int flag, unsigned long val)
{
      unsigned int new_rx_tail;
      lirc_t newval;

      dprintk("add flag %d with val %lu\n", flag, val);

      newval = val & PULSE_MASK;

      /*
       * statistically, pulses are ~TIME_CONST/2 too long. we could
       * maybe make this more exact, but this is good enough
       */
      if (flag) {
            /* pulse */
            if (newval > TIME_CONST / 2)
                  newval -= TIME_CONST / 2;
            else /* should not ever happen */
                  newval = 1;
            newval |= PULSE_BIT;
      } else
            newval += TIME_CONST / 2;
      new_rx_tail = (rx_tail + 1) & (RBUF_LEN - 1);
      if (new_rx_tail == rx_head) {
            dprintk("Buffer overrun.\n");
            return;
      }
      rx_buf[rx_tail] = newval;
      rx_tail = new_rx_tail;
      wake_up_interruptible(&lirc_read_queue);
}


static struct file_operations lirc_fops = {
      .owner            = THIS_MODULE,
      .read       = lirc_read,
      .write            = lirc_write,
      .poll       = lirc_poll,
      .ioctl            = lirc_ioctl,
      .open       = lirc_open,
      .release    = lirc_close,
};

static int set_use_inc(void *data)
{
       return 0;
}

static void set_use_dec(void *data)
{
}

static struct lirc_driver driver = {
       .name            = LIRC_DRIVER_NAME,
       .minor           = -1,
       .code_length     = 1,
       .sample_rate     = 0,
       .data            = NULL,
       .add_to_buf      = NULL,
#ifndef LIRC_REMOVE_DURING_EXPORT
       .get_queue = NULL,
#endif
       .set_use_inc     = set_use_inc,
       .set_use_dec     = set_use_dec,
       .fops            = &lirc_fops,
       .dev       = NULL,
       .owner           = THIS_MODULE,
};


static int init_chrdev(void)
{
      driver.minor = lirc_register_driver(&driver);

      if (driver.minor < 0) {
            printk(KERN_ERR LIRC_DRIVER_NAME ": init_chrdev() failed.\n");
            return -EIO;
      }
      return 0;
}


static void drop_chrdev(void)
{
      lirc_unregister_driver(driver.minor);
}


/* SECTION: Hardware */
static long delta(struct timeval *tv1, struct timeval *tv2)
{
      unsigned long deltv;

      deltv = tv2->tv_sec - tv1->tv_sec;
      if (deltv > 15)
            deltv = 0xFFFFFF;
      else
            deltv = deltv*1000000 + tv2->tv_usec - tv1->tv_usec;
      return deltv;
}

static void it87_timeout(unsigned long data)
{
      unsigned long flags;

      /* avoid interference with interrupt */
      spin_lock_irqsave(&timer_lock, flags);

      if (digimatrix) {
            /* We have timed out. Disable the RX mechanism. */

            outb((inb(io + IT87_CIR_RCR) & ~IT87_CIR_RCR_RXEN) |
                 IT87_CIR_RCR_RXACT, io + IT87_CIR_RCR);
            if (it87_RXEN_mask)
                  outb(inb(io + IT87_CIR_RCR) | IT87_CIR_RCR_RXEN,
                       io + IT87_CIR_RCR);
            dprintk(" TIMEOUT\n");
            timer_enabled = 0;

            /* fifo clear */
            outb(inb(io + IT87_CIR_TCR1) | IT87_CIR_TCR1_FIFOCLR,
                 io+IT87_CIR_TCR1);

      } else {
            /*
             * if last received signal was a pulse, but receiving stopped
             * within the 9 bit frame, we need to finish this pulse and
             * simulate a signal change to from pulse to space. Otherwise
             * upper layers will receive two sequences next time.
             */

            if (last_value) {
                  unsigned long pulse_end;

                  /* determine 'virtual' pulse end: */
                  pulse_end = delta(&last_tv, &last_intr_tv);
                  dprintk("timeout add %d for %lu usec\n",
                        last_value, pulse_end);
                  add_read_queue(last_value, pulse_end);
                  last_value = 0;
                  last_tv = last_intr_tv;
            }
      }
      spin_unlock_irqrestore(&timer_lock, flags);
}

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
static irqreturn_t it87_interrupt(int irq, void *dev_id, struct pt_regs *regs)
#else
static irqreturn_t it87_interrupt(int irq, void *dev_id)
#endif
{
      unsigned char data;
      struct timeval curr_tv;
      static unsigned long deltv;
      unsigned long deltintrtv;
      unsigned long flags, hw_flags;
      int iir, lsr;
      int fifo = 0;
      static char lastbit;
      char bit;

      /* Bit duration in microseconds */
      const unsigned long bit_duration = 1000000ul /
            (115200 / IT87_CIR_BAUDRATE_DIVISOR);


      iir = inb(io + IT87_CIR_IIR);

      switch (iir & IT87_CIR_IIR_IID) {
      case 0x4:
      case 0x6:
            lsr = inb(io + IT87_CIR_RSR) & (IT87_CIR_RSR_RXFTO |
                                    IT87_CIR_RSR_RXFBC);
            fifo = lsr & IT87_CIR_RSR_RXFBC;
            dprintk("iir: 0x%x fifo: 0x%x\n", iir, lsr);

            /* avoid interference with timer */
            spin_lock_irqsave(&timer_lock, flags);
            spin_lock_irqsave(&hardware_lock, hw_flags);
            if (digimatrix) {
                  static unsigned long acc_pulse;
                  static unsigned long acc_space;

                  do {
                        data = inb(io + IT87_CIR_DR);
                        data = ~data;
                        fifo--;
                        if (data != 0x00) {
                              if (timer_enabled)
                                    del_timer(&timerlist);
                              /*
                               * start timer for end of
                               * sequence detection
                               */
                              timerlist.expires = jiffies +
                                              IT87_TIMEOUT;
                              add_timer(&timerlist);
                              timer_enabled = 1;
                        }
                        /* Loop through */
                        for (bit = 0; bit < 8; ++bit) {
                              if ((data >> bit) & 1) {
                                    ++acc_pulse;
                                    if (lastbit == 0) {
                                          add_read_queue(0,
                                                acc_space *
                                                 bit_duration);
                                          acc_space = 0;
                                    }
                              } else {
                                    ++acc_space;
                                    if (lastbit == 1) {
                                          add_read_queue(1,
                                                acc_pulse *
                                                 bit_duration);
                                          acc_pulse = 0;
                                    }
                              }
                              lastbit = (data >> bit) & 1;
                        }

                  } while (fifo != 0);
            } else { /* Normal Operation */
                  do {
                        del_timer(&timerlist);
                        data = inb(io + IT87_CIR_DR);

                        dprintk("data=%.2x\n", data);
                        do_gettimeofday(&curr_tv);
                        deltv = delta(&last_tv, &curr_tv);
                        deltintrtv = delta(&last_intr_tv, &curr_tv);

                        dprintk("t %lu , d %d\n",
                              deltintrtv, (int)data);

                        /*
                         * if nothing came in last 2 cycles,
                         * it was gap
                         */
                        if (deltintrtv > TIME_CONST * 2) {
                              if (last_value) {
                                    dprintk("GAP\n");

                                    /* simulate signal change */
                                    add_read_queue(last_value,
                                                 deltv -
                                                 deltintrtv);
                                    last_value = 0;
                                    last_tv.tv_sec =
                                          last_intr_tv.tv_sec;
                                    last_tv.tv_usec =
                                          last_intr_tv.tv_usec;
                                    deltv = deltintrtv;
                              }
                        }
                        data = 1;
                        if (data ^ last_value) {
                              /*
                               * deltintrtv > 2*TIME_CONST,
                               * remember ? the other case is
                               * timeout
                               */
                              add_read_queue(last_value,
                                           deltv-TIME_CONST);
                              last_value = data;
                              last_tv = curr_tv;
                              if (last_tv.tv_usec >= TIME_CONST)
                                    last_tv.tv_usec -= TIME_CONST;
                              else {
                                    last_tv.tv_sec--;
                                    last_tv.tv_usec += 1000000 -
                                          TIME_CONST;
                              }
                        }
                        last_intr_tv = curr_tv;
                        if (data) {
                              /*
                               * start timer for end of
                               * sequence detection
                               */
                              timerlist.expires =
                                    jiffies + IT87_TIMEOUT;
                              add_timer(&timerlist);
                        }
                        outb((inb(io + IT87_CIR_RCR) &
                             ~IT87_CIR_RCR_RXEN) |
                             IT87_CIR_RCR_RXACT,
                             io + IT87_CIR_RCR);
                        if (it87_RXEN_mask)
                              outb(inb(io + IT87_CIR_RCR) |
                                   IT87_CIR_RCR_RXEN,
                                   io + IT87_CIR_RCR);
                        fifo--;
                  } while (fifo != 0);
            }
            spin_unlock_irqrestore(&hardware_lock, hw_flags);
            spin_unlock_irqrestore(&timer_lock, flags);

            return IRQ_RETVAL(IRQ_HANDLED);

      default:
            /* not our irq */
            dprintk("unknown IRQ (shouldn't happen) !!\n");
            return IRQ_RETVAL(IRQ_NONE);
      }
}


static void send_it87(unsigned long len, unsigned long stime,
                  unsigned char send_byte, unsigned int count_bits)
{
      long count = len / stime;
      long time_left = 0;
      static unsigned char byte_out;
      unsigned long hw_flags;

      dprintk("%s: len=%ld, sb=%d\n", __func__, len, send_byte);

      time_left = (long)len - (long)count * (long)stime;
      count += ((2 * time_left) / stime);
      while (count) {
            long i = 0;
            for (i = 0; i < count_bits; i++) {
                  byte_out = (byte_out << 1) | (send_byte & 1);
                  it87_bits_in_byte_out++;
            }
            if (it87_bits_in_byte_out == 8) {
                  dprintk("out=0x%x, tsr_txfbc: 0x%x\n",
                        byte_out,
                        inb(io + IT87_CIR_TSR) &
                        IT87_CIR_TSR_TXFBC);

                  while ((inb(io + IT87_CIR_TSR) &
                        IT87_CIR_TSR_TXFBC) >= IT87_CIR_FIFO_SIZE)
                        ;

                  spin_lock_irqsave(&hardware_lock, hw_flags);
                  outb(byte_out, io + IT87_CIR_DR);
                  spin_unlock_irqrestore(&hardware_lock, hw_flags);

                  it87_bits_in_byte_out = 0;
                  it87_send_counter++;
                  byte_out = 0;
            }
            count--;
      }
}


/*TODO: maybe exchange space and pulse because it8705 only modulates 0-bits */

static void send_space(unsigned long len)
{
      send_it87(len, TIME_CONST, IT87_CIR_SPACE, IT87_CIR_BAUDRATE_DIVISOR);
}

static void send_pulse(unsigned long len)
{
      send_it87(len, TIME_CONST, IT87_CIR_PULSE, IT87_CIR_BAUDRATE_DIVISOR);
}


static void init_send()
{
      unsigned long flags;

      spin_lock_irqsave(&hardware_lock, flags);
      /* RXEN=0: receiver disable */
      it87_RXEN_mask = 0;
      outb(inb(io + IT87_CIR_RCR) & ~IT87_CIR_RCR_RXEN,
           io + IT87_CIR_RCR);
      spin_unlock_irqrestore(&hardware_lock, flags);
      it87_bits_in_byte_out = 0;
      it87_send_counter = 0;
}


static void terminate_send(unsigned long len)
{
      unsigned long flags;
      unsigned long last = 0;

      last = it87_send_counter;
      /* make sure all necessary data has been sent */
      while (last == it87_send_counter)
            send_space(len);
      /* wait until all data sent */
      while ((inb(io + IT87_CIR_TSR) & IT87_CIR_TSR_TXFBC) != 0)
            ;
      /* then re-enable receiver */
      spin_lock_irqsave(&hardware_lock, flags);
      it87_RXEN_mask = IT87_CIR_RCR_RXEN;
      outb(inb(io + IT87_CIR_RCR) | IT87_CIR_RCR_RXEN,
           io + IT87_CIR_RCR);
      spin_unlock_irqrestore(&hardware_lock, flags);
}


static int init_hardware(void)
{
      unsigned long flags;
      unsigned char it87_rcr = 0;

      spin_lock_irqsave(&hardware_lock, flags);
      /* init cir-port */
      /* enable r/w-access to Baudrate-Register */
      outb(IT87_CIR_IER_BR, io + IT87_CIR_IER);
      outb(IT87_CIR_BAUDRATE_DIVISOR % 0x100, io+IT87_CIR_BDLR);
      outb(IT87_CIR_BAUDRATE_DIVISOR / 0x100, io+IT87_CIR_BDHR);
      /* Baudrate Register off, define IRQs: Input only */
      if (digimatrix) {
            outb(IT87_CIR_IER_IEC | IT87_CIR_IER_RFOIE, io + IT87_CIR_IER);
            /* RX: HCFS=0, RXDCR = 001b (33,75..38,25 kHz), RXEN=1 */
      } else {
            outb(IT87_CIR_IER_IEC | IT87_CIR_IER_RDAIE, io + IT87_CIR_IER);
            /* RX: HCFS=0, RXDCR = 001b (35,6..40,3 kHz), RXEN=1 */
      }
      it87_rcr = (IT87_CIR_RCR_RXEN & it87_RXEN_mask) | 0x1;
      if (it87_enable_demodulator)
            it87_rcr |= IT87_CIR_RCR_RXEND;
      outb(it87_rcr, io + IT87_CIR_RCR);
      if (digimatrix) {
            /* Set FIFO depth to 1 byte, and disable TX */
            outb(inb(io + IT87_CIR_TCR1) |  0x00,
                 io + IT87_CIR_TCR1);

            /*
             * TX: it87_freq (36kHz), 'reserved' sensitivity
             * setting (0x00)
             */
            outb(((it87_freq - IT87_CIR_FREQ_MIN) << 3) | 0x00,
                 io + IT87_CIR_TCR2);
      } else {
            /* TX: 38kHz, 13,3us (pulse-width) */
            outb(((it87_freq - IT87_CIR_FREQ_MIN) << 3) | 0x06,
                 io + IT87_CIR_TCR2);
      }
      spin_unlock_irqrestore(&hardware_lock, flags);
      return 0;
}


static void drop_hardware(void)
{
      unsigned long flags;

      spin_lock_irqsave(&hardware_lock, flags);
      disable_irq(irq);
      /* receiver disable */
      it87_RXEN_mask = 0;
      outb(0x1, io + IT87_CIR_RCR);
      /* turn off irqs */
      outb(0, io + IT87_CIR_IER);
      /* fifo clear */
      outb(IT87_CIR_TCR1_FIFOCLR, io+IT87_CIR_TCR1);
      /* reset */
      outb(IT87_CIR_IER_RESET, io+IT87_CIR_IER);
      enable_irq(irq);
      spin_unlock_irqrestore(&hardware_lock, flags);
}


static unsigned char it87_read(unsigned char port)
{
      outb(port, IT87_ADRPORT);
      return inb(IT87_DATAPORT);
}


static void it87_write(unsigned char port, unsigned char data)
{
      outb(port, IT87_ADRPORT);
      outb(data, IT87_DATAPORT);
}


/* SECTION: Initialisation */

static int init_port(void)
{
      unsigned long hw_flags;
      int retval = 0;

      unsigned char init_bytes[4] = IT87_INIT;
      unsigned char it87_chipid = 0;
      unsigned char ldn = 0;
      unsigned int  it87_io = 0;
      unsigned int  it87_irq = 0;

      /* Enter MB PnP Mode */
      outb(init_bytes[0], IT87_ADRPORT);
      outb(init_bytes[1], IT87_ADRPORT);
      outb(init_bytes[2], IT87_ADRPORT);
      outb(init_bytes[3], IT87_ADRPORT);

      /* 8712 or 8705 ? */
      it87_chipid = it87_read(IT87_CHIP_ID1);
      if (it87_chipid != 0x87) {
            retval = -ENXIO;
            return retval;
      }
      it87_chipid = it87_read(IT87_CHIP_ID2);
      if ((it87_chipid != 0x12) &&
            (it87_chipid != 0x05) &&
            (it87_chipid != 0x20)) {
            printk(KERN_INFO LIRC_DRIVER_NAME
                   ": no IT8705/12/20 found, exiting..\n");
            retval = -ENXIO;
            return retval;
      }
      printk(KERN_INFO LIRC_DRIVER_NAME
             ": found IT87%.2x.\n",
             it87_chipid);

      /* get I/O-Port and IRQ */
      if (it87_chipid == 0x12)
            ldn = IT8712_CIR_LDN;
      else
            ldn = IT8705_CIR_LDN;
      it87_write(IT87_LDN, ldn);

      it87_io = it87_read(IT87_CIR_BASE_MSB) * 256 +
              it87_read(IT87_CIR_BASE_LSB);
      if (it87_io == 0) {
            if (io == 0)
                  io = IT87_CIR_DEFAULT_IOBASE;
            printk(KERN_INFO LIRC_DRIVER_NAME
                   ": set default io 0x%x\n",
                   io);
            it87_write(IT87_CIR_BASE_MSB, io / 0x100);
            it87_write(IT87_CIR_BASE_LSB, io % 0x100);
      } else
            io = it87_io;

      it87_irq = it87_read(IT87_CIR_IRQ);
      if (digimatrix || it87_irq == 0) {
            if (irq == 0)
                  irq = IT87_CIR_DEFAULT_IRQ;
            printk(KERN_INFO LIRC_DRIVER_NAME
                   ": set default irq 0x%x\n",
                   irq);
            it87_write(IT87_CIR_IRQ, irq);
      } else
            irq = it87_irq;

      spin_lock_irqsave(&hardware_lock, hw_flags);
      /* reset */
      outb(IT87_CIR_IER_RESET, io+IT87_CIR_IER);
      /* fifo clear */
      outb(IT87_CIR_TCR1_FIFOCLR |
           /*          IT87_CIR_TCR1_ILE | */
           IT87_CIR_TCR1_TXRLE |
           IT87_CIR_TCR1_TXENDF, io+IT87_CIR_TCR1);
      spin_unlock_irqrestore(&hardware_lock, hw_flags);

      /* get I/O port access and IRQ line */
      if (request_region(io, 8, LIRC_DRIVER_NAME) == NULL) {
            printk(KERN_ERR LIRC_DRIVER_NAME
                   ": i/o port 0x%.4x already in use.\n", io);
            /* Leaving MB PnP Mode */
            it87_write(IT87_CFGCTRL, 0x2);
            return -EBUSY;
      }

      /* activate CIR-Device */
      it87_write(IT87_CIR_ACT, 0x1);

      /* Leaving MB PnP Mode */
      it87_write(IT87_CFGCTRL, 0x2);

      retval = request_irq(irq, it87_interrupt, 0 /*IRQF_DISABLED*/,
                       LIRC_DRIVER_NAME, NULL);
      if (retval < 0) {
            printk(KERN_ERR LIRC_DRIVER_NAME
                   ": IRQ %d already in use.\n",
                   irq);
            release_region(io, 8);
            return retval;
      }

      printk(KERN_INFO LIRC_DRIVER_NAME
             ": I/O port 0x%.4x, IRQ %d.\n", io, irq);

      init_timer(&timerlist);
      timerlist.function = it87_timeout;
      timerlist.data = 0xabadcafe;

      return 0;
}


static void drop_port(void)
{
#if 0
      unsigned char init_bytes[4] = IT87_INIT;

      /* Enter MB PnP Mode */
      outb(init_bytes[0], IT87_ADRPORT);
      outb(init_bytes[1], IT87_ADRPORT);
      outb(init_bytes[2], IT87_ADRPORT);
      outb(init_bytes[3], IT87_ADRPORT);

      /* deactivate CIR-Device */
      it87_write(IT87_CIR_ACT, 0x0);

      /* Leaving MB PnP Mode */
      it87_write(IT87_CFGCTRL, 0x2);
#endif

      del_timer_sync(&timerlist);
      free_irq(irq, NULL);
      release_region(io, 8);
}


static int init_lirc_it87(void)
{
      int retval;

      init_waitqueue_head(&lirc_read_queue);
      retval = init_port();
      if (retval < 0)
            return retval;
      init_hardware();
      printk(KERN_INFO LIRC_DRIVER_NAME ": Installed.\n");
      return 0;
}


static int __init lirc_it87_init(void)
{
      int retval;

      retval = init_chrdev();
      if (retval < 0)
            return retval;
      retval = init_lirc_it87();
      if (retval) {
            drop_chrdev();
            return retval;
      }
      return 0;
}


static void __exit lirc_it87_exit(void)
{
      drop_hardware();
      drop_chrdev();
      drop_port();
      printk(KERN_INFO LIRC_DRIVER_NAME ": Uninstalled.\n");
}

module_init(lirc_it87_init);
module_exit(lirc_it87_exit);

MODULE_DESCRIPTION("LIRC driver for ITE IT8712/IT8705 CIR port");
MODULE_AUTHOR("Hans-Günter Lütke Uphues");
MODULE_LICENSE("GPL");

module_param(io, int, S_IRUGO);
MODULE_PARM_DESC(io, "I/O base address (default: 0x310)");

module_param(irq, int, S_IRUGO);
#ifdef LIRC_IT87_DIGIMATRIX
MODULE_PARM_DESC(irq, "Interrupt (1,3-12) (default: 9)");
#else
MODULE_PARM_DESC(irq, "Interrupt (1,3-12) (default: 7)");
#endif

module_param(it87_enable_demodulator, bool, S_IRUGO);
MODULE_PARM_DESC(it87_enable_demodulator,
             "Receiver demodulator enable/disable (1/0), default: 0");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable debugging messages");

module_param(digimatrix, bool, S_IRUGO | S_IWUSR);
#ifdef LIRC_IT87_DIGIMATRIX
MODULE_PARM_DESC(digimatrix,
      "Asus Digimatrix it87 compat. enable/disable (1/0), default: 1");
#else
MODULE_PARM_DESC(digimatrix,
      "Asus Digimatrix it87 compat. enable/disable (1/0), default: 0");
#endif


module_param(it87_freq, int, S_IRUGO);
#ifdef LIRC_IT87_DIGIMATRIX
MODULE_PARM_DESC(it87_freq,
    "Carrier demodulator frequency (kHz), (default: 36)");
#else
MODULE_PARM_DESC(it87_freq,
    "Carrier demodulator frequency (kHz), (default: 38)");
#endif
EXPORT_NO_SYMBOLS;

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