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i8042.c

/*
 *  i8042 keyboard and mouse controller driver for Linux
 *
 *  Copyright (c) 1999-2004 Vojtech Pavlik
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/err.h>
#include <linux/rcupdate.h>
#include <linux/platform_device.h>
#include <linux/i8042.h>

#include <asm/io.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("i8042 keyboard and mouse controller driver");
MODULE_LICENSE("GPL");

static unsigned int i8042_nokbd;
module_param_named(nokbd, i8042_nokbd, bool, 0);
MODULE_PARM_DESC(nokbd, "Do not probe or use KBD port.");

static unsigned int i8042_noaux;
module_param_named(noaux, i8042_noaux, bool, 0);
MODULE_PARM_DESC(noaux, "Do not probe or use AUX (mouse) port.");

static unsigned int i8042_nomux;
module_param_named(nomux, i8042_nomux, bool, 0);
MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing conrtoller is present.");

static unsigned int i8042_unlock;
module_param_named(unlock, i8042_unlock, bool, 0);
MODULE_PARM_DESC(unlock, "Ignore keyboard lock.");

static unsigned int i8042_reset;
module_param_named(reset, i8042_reset, bool, 0);
MODULE_PARM_DESC(reset, "Reset controller during init and cleanup.");

static unsigned int i8042_direct;
module_param_named(direct, i8042_direct, bool, 0);
MODULE_PARM_DESC(direct, "Put keyboard port into non-translated mode.");

static unsigned int i8042_dumbkbd;
module_param_named(dumbkbd, i8042_dumbkbd, bool, 0);
MODULE_PARM_DESC(dumbkbd, "Pretend that controller can only read data from keyboard");

static unsigned int i8042_noloop;
module_param_named(noloop, i8042_noloop, bool, 0);
MODULE_PARM_DESC(noloop, "Disable the AUX Loopback command while probing for the AUX port");

static unsigned int i8042_blink_frequency = 500;
module_param_named(panicblink, i8042_blink_frequency, uint, 0600);
MODULE_PARM_DESC(panicblink, "Frequency with which keyboard LEDs should blink when kernel panics");

#ifdef CONFIG_PNP
static int i8042_nopnp;
module_param_named(nopnp, i8042_nopnp, bool, 0);
MODULE_PARM_DESC(nopnp, "Do not use PNP to detect controller settings");
#endif

#define DEBUG
#ifdef DEBUG
static int i8042_debug;
module_param_named(debug, i8042_debug, bool, 0600);
MODULE_PARM_DESC(debug, "Turn i8042 debugging mode on and off");
#endif

#include "i8042.h"

static DEFINE_SPINLOCK(i8042_lock);

struct i8042_port {
      struct serio *serio;
      int irq;
      unsigned char exists;
      signed char mux;
};

#define I8042_KBD_PORT_NO     0
#define I8042_AUX_PORT_NO     1
#define I8042_MUX_PORT_NO     2
#define I8042_NUM_PORTS       (I8042_NUM_MUX_PORTS + 2)

static struct i8042_port i8042_ports[I8042_NUM_PORTS];

static unsigned char i8042_initial_ctr;
static unsigned char i8042_ctr;
static unsigned char i8042_mux_present;
static unsigned char i8042_kbd_irq_registered;
static unsigned char i8042_aux_irq_registered;
static unsigned char i8042_suppress_kbd_ack;
static struct platform_device *i8042_platform_device;

static irqreturn_t i8042_interrupt(int irq, void *dev_id);

/*
 * The i8042_wait_read() and i8042_wait_write functions wait for the i8042 to
 * be ready for reading values from it / writing values to it.
 * Called always with i8042_lock held.
 */

static int i8042_wait_read(void)
{
      int i = 0;

      while ((~i8042_read_status() & I8042_STR_OBF) && (i < I8042_CTL_TIMEOUT)) {
            udelay(50);
            i++;
      }
      return -(i == I8042_CTL_TIMEOUT);
}

static int i8042_wait_write(void)
{
      int i = 0;

      while ((i8042_read_status() & I8042_STR_IBF) && (i < I8042_CTL_TIMEOUT)) {
            udelay(50);
            i++;
      }
      return -(i == I8042_CTL_TIMEOUT);
}

/*
 * i8042_flush() flushes all data that may be in the keyboard and mouse buffers
 * of the i8042 down the toilet.
 */

static int i8042_flush(void)
{
      unsigned long flags;
      unsigned char data, str;
      int i = 0;

      spin_lock_irqsave(&i8042_lock, flags);

      while (((str = i8042_read_status()) & I8042_STR_OBF) && (i < I8042_BUFFER_SIZE)) {
            udelay(50);
            data = i8042_read_data();
            i++;
            dbg("%02x <- i8042 (flush, %s)", data,
                  str & I8042_STR_AUXDATA ? "aux" : "kbd");
      }

      spin_unlock_irqrestore(&i8042_lock, flags);

      return i;
}

/*
 * i8042_command() executes a command on the i8042. It also sends the input
 * parameter(s) of the commands to it, and receives the output value(s). The
 * parameters are to be stored in the param array, and the output is placed
 * into the same array. The number of the parameters and output values is
 * encoded in bits 8-11 of the command number.
 */

static int __i8042_command(unsigned char *param, int command)
{
      int i, error;

      if (i8042_noloop && command == I8042_CMD_AUX_LOOP)
            return -1;

      error = i8042_wait_write();
      if (error)
            return error;

      dbg("%02x -> i8042 (command)", command & 0xff);
      i8042_write_command(command & 0xff);

      for (i = 0; i < ((command >> 12) & 0xf); i++) {
            error = i8042_wait_write();
            if (error)
                  return error;
            dbg("%02x -> i8042 (parameter)", param[i]);
            i8042_write_data(param[i]);
      }

      for (i = 0; i < ((command >> 8) & 0xf); i++) {
            error = i8042_wait_read();
            if (error) {
                  dbg("     -- i8042 (timeout)");
                  return error;
            }

            if (command == I8042_CMD_AUX_LOOP &&
                !(i8042_read_status() & I8042_STR_AUXDATA)) {
                  dbg("     -- i8042 (auxerr)");
                  return -1;
            }

            param[i] = i8042_read_data();
            dbg("%02x <- i8042 (return)", param[i]);
      }

      return 0;
}

int i8042_command(unsigned char *param, int command)
{
      unsigned long flags;
      int retval;

      spin_lock_irqsave(&i8042_lock, flags);
      retval = __i8042_command(param, command);
      spin_unlock_irqrestore(&i8042_lock, flags);

      return retval;
}
EXPORT_SYMBOL(i8042_command);

/*
 * i8042_kbd_write() sends a byte out through the keyboard interface.
 */

static int i8042_kbd_write(struct serio *port, unsigned char c)
{
      unsigned long flags;
      int retval = 0;

      spin_lock_irqsave(&i8042_lock, flags);

      if (!(retval = i8042_wait_write())) {
            dbg("%02x -> i8042 (kbd-data)", c);
            i8042_write_data(c);
      }

      spin_unlock_irqrestore(&i8042_lock, flags);

      return retval;
}

/*
 * i8042_aux_write() sends a byte out through the aux interface.
 */

static int i8042_aux_write(struct serio *serio, unsigned char c)
{
      struct i8042_port *port = serio->port_data;

      return i8042_command(&c, port->mux == -1 ?
                              I8042_CMD_AUX_SEND :
                              I8042_CMD_MUX_SEND + port->mux);
}

/*
 * i8042_start() is called by serio core when port is about to finish
 * registering. It will mark port as existing so i8042_interrupt can
 * start sending data through it.
 */
static int i8042_start(struct serio *serio)
{
      struct i8042_port *port = serio->port_data;

      port->exists = 1;
      mb();
      return 0;
}

/*
 * i8042_stop() marks serio port as non-existing so i8042_interrupt
 * will not try to send data to the port that is about to go away.
 * The function is called by serio core as part of unregister procedure.
 */
static void i8042_stop(struct serio *serio)
{
      struct i8042_port *port = serio->port_data;

      port->exists = 0;
      synchronize_sched();
      port->serio = NULL;
}

/*
 * i8042_interrupt() is the most important function in this driver -
 * it handles the interrupts from the i8042, and sends incoming bytes
 * to the upper layers.
 */

static irqreturn_t i8042_interrupt(int irq, void *dev_id)
{
      struct i8042_port *port;
      unsigned long flags;
      unsigned char str, data;
      unsigned int dfl;
      unsigned int port_no;
      int ret = 1;

      spin_lock_irqsave(&i8042_lock, flags);
      str = i8042_read_status();
      if (unlikely(~str & I8042_STR_OBF)) {
            spin_unlock_irqrestore(&i8042_lock, flags);
            if (irq) dbg("Interrupt %d, without any data", irq);
            ret = 0;
            goto out;
      }
      data = i8042_read_data();
      spin_unlock_irqrestore(&i8042_lock, flags);

      if (i8042_mux_present && (str & I8042_STR_AUXDATA)) {
            static unsigned long last_transmit;
            static unsigned char last_str;

            dfl = 0;
            if (str & I8042_STR_MUXERR) {
                  dbg("MUX error, status is %02x, data is %02x", str, data);
/*
 * When MUXERR condition is signalled the data register can only contain
 * 0xfd, 0xfe or 0xff if implementation follows the spec. Unfortunately
 * it is not always the case. Some KBCs also report 0xfc when there is
 * nothing connected to the port while others sometimes get confused which
 * port the data came from and signal error leaving the data intact. They
 * _do not_ revert to legacy mode (actually I've never seen KBC reverting
 * to legacy mode yet, when we see one we'll add proper handling).
 * Anyway, we process 0xfc, 0xfd, 0xfe and 0xff as timeouts, and for the
 * rest assume that the data came from the same serio last byte
 * was transmitted (if transmission happened not too long ago).
 */

                  switch (data) {
                        default:
                              if (time_before(jiffies, last_transmit + HZ/10)) {
                                    str = last_str;
                                    break;
                              }
                              /* fall through - report timeout */
                        case 0xfc:
                        case 0xfd:
                        case 0xfe: dfl = SERIO_TIMEOUT; data = 0xfe; break;
                        case 0xff: dfl = SERIO_PARITY;  data = 0xfe; break;
                  }
            }

            port_no = I8042_MUX_PORT_NO + ((str >> 6) & 3);
            last_str = str;
            last_transmit = jiffies;
      } else {

            dfl = ((str & I8042_STR_PARITY) ? SERIO_PARITY : 0) |
                  ((str & I8042_STR_TIMEOUT) ? SERIO_TIMEOUT : 0);

            port_no = (str & I8042_STR_AUXDATA) ?
                        I8042_AUX_PORT_NO : I8042_KBD_PORT_NO;
      }

      port = &i8042_ports[port_no];

      dbg("%02x <- i8042 (interrupt, %d, %d%s%s)",
          data, port_no, irq,
          dfl & SERIO_PARITY ? ", bad parity" : "",
          dfl & SERIO_TIMEOUT ? ", timeout" : "");

      if (unlikely(i8042_suppress_kbd_ack))
            if (port_no == I8042_KBD_PORT_NO &&
                (data == 0xfa || data == 0xfe)) {
                  i8042_suppress_kbd_ack--;
                  goto out;
            }

      if (likely(port->exists))
            serio_interrupt(port->serio, data, dfl);

 out:
      return IRQ_RETVAL(ret);
}

/*
 * i8042_enable_kbd_port enables keybaord port on chip
 */

static int i8042_enable_kbd_port(void)
{
      i8042_ctr &= ~I8042_CTR_KBDDIS;
      i8042_ctr |= I8042_CTR_KBDINT;

      if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
            i8042_ctr &= ~I8042_CTR_KBDINT;
            i8042_ctr |= I8042_CTR_KBDDIS;
            printk(KERN_ERR "i8042.c: Failed to enable KBD port.\n");
            return -EIO;
      }

      return 0;
}

/*
 * i8042_enable_aux_port enables AUX (mouse) port on chip
 */

static int i8042_enable_aux_port(void)
{
      i8042_ctr &= ~I8042_CTR_AUXDIS;
      i8042_ctr |= I8042_CTR_AUXINT;

      if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
            i8042_ctr &= ~I8042_CTR_AUXINT;
            i8042_ctr |= I8042_CTR_AUXDIS;
            printk(KERN_ERR "i8042.c: Failed to enable AUX port.\n");
            return -EIO;
      }

      return 0;
}

/*
 * i8042_enable_mux_ports enables 4 individual AUX ports after
 * the controller has been switched into Multiplexed mode
 */

static int i8042_enable_mux_ports(void)
{
      unsigned char param;
      int i;

      for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
            i8042_command(&param, I8042_CMD_MUX_PFX + i);
            i8042_command(&param, I8042_CMD_AUX_ENABLE);
      }

      return i8042_enable_aux_port();
}

/*
 * i8042_set_mux_mode checks whether the controller has an active
 * multiplexor and puts the chip into Multiplexed (1) or Legacy (0) mode.
 */

static int i8042_set_mux_mode(unsigned int mode, unsigned char *mux_version)
{

      unsigned char param;
/*
 * Get rid of bytes in the queue.
 */

      i8042_flush();

/*
 * Internal loopback test - send three bytes, they should come back from the
 * mouse interface, the last should be version.
 */

      param = 0xf0;
      if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0xf0)
            return -1;
      param = mode ? 0x56 : 0xf6;
      if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != (mode ? 0x56 : 0xf6))
            return -1;
      param = mode ? 0xa4 : 0xa5;
      if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param == (mode ? 0xa4 : 0xa5))
            return -1;

      if (mux_version)
            *mux_version = param;

      return 0;
}

/*
 * i8042_check_mux() checks whether the controller supports the PS/2 Active
 * Multiplexing specification by Synaptics, Phoenix, Insyde and
 * LCS/Telegraphics.
 */

static int __devinit i8042_check_mux(void)
{
      unsigned char mux_version;

      if (i8042_set_mux_mode(1, &mux_version))
            return -1;

/*
 * Workaround for interference with USB Legacy emulation
 * that causes a v10.12 MUX to be found.
 */
      if (mux_version == 0xAC)
            return -1;

      printk(KERN_INFO "i8042.c: Detected active multiplexing controller, rev %d.%d.\n",
            (mux_version >> 4) & 0xf, mux_version & 0xf);

/*
 * Disable all muxed ports by disabling AUX.
 */
      i8042_ctr |= I8042_CTR_AUXDIS;
      i8042_ctr &= ~I8042_CTR_AUXINT;

      if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
            printk(KERN_ERR "i8042.c: Failed to disable AUX port, can't use MUX.\n");
            return -EIO;
      }

      i8042_mux_present = 1;

      return 0;
}

/*
 * The following is used to test AUX IRQ delivery.
 */
static struct completion i8042_aux_irq_delivered __devinitdata;
static int i8042_irq_being_tested __devinitdata;

static irqreturn_t __devinit i8042_aux_test_irq(int irq, void *dev_id)
{
      unsigned long flags;
      unsigned char str, data;
      int ret = 0;

      spin_lock_irqsave(&i8042_lock, flags);
      str = i8042_read_status();
      if (str & I8042_STR_OBF) {
            data = i8042_read_data();
            if (i8042_irq_being_tested &&
                data == 0xa5 && (str & I8042_STR_AUXDATA))
                  complete(&i8042_aux_irq_delivered);
            ret = 1;
      }
      spin_unlock_irqrestore(&i8042_lock, flags);

      return IRQ_RETVAL(ret);
}

/*
 * i8042_toggle_aux - enables or disables AUX port on i8042 via command and
 * verifies success by readinng CTR. Used when testing for presence of AUX
 * port.
 */
static int __devinit i8042_toggle_aux(int on)
{
      unsigned char param;
      int i;

      if (i8042_command(&param,
                  on ? I8042_CMD_AUX_ENABLE : I8042_CMD_AUX_DISABLE))
            return -1;

      /* some chips need some time to set the I8042_CTR_AUXDIS bit */
      for (i = 0; i < 100; i++) {
            udelay(50);

            if (i8042_command(&param, I8042_CMD_CTL_RCTR))
                  return -1;

            if (!(param & I8042_CTR_AUXDIS) == on)
                  return 0;
      }

      return -1;
}

/*
 * i8042_check_aux() applies as much paranoia as it can at detecting
 * the presence of an AUX interface.
 */

static int __devinit i8042_check_aux(void)
{
      int retval = -1;
      int irq_registered = 0;
      int aux_loop_broken = 0;
      unsigned long flags;
      unsigned char param;

/*
 * Get rid of bytes in the queue.
 */

      i8042_flush();

/*
 * Internal loopback test - filters out AT-type i8042's. Unfortunately
 * SiS screwed up and their 5597 doesn't support the LOOP command even
 * though it has an AUX port.
 */

      param = 0x5a;
      retval = i8042_command(&param, I8042_CMD_AUX_LOOP);
      if (retval || param != 0x5a) {

/*
 * External connection test - filters out AT-soldered PS/2 i8042's
 * 0x00 - no error, 0x01-0x03 - clock/data stuck, 0xff - general error
 * 0xfa - no error on some notebooks which ignore the spec
 * Because it's common for chipsets to return error on perfectly functioning
 * AUX ports, we test for this only when the LOOP command failed.
 */

            if (i8042_command(&param, I8042_CMD_AUX_TEST) ||
                (param && param != 0xfa && param != 0xff))
                  return -1;

/*
 * If AUX_LOOP completed without error but returned unexpected data
 * mark it as broken
 */
            if (!retval)
                  aux_loop_broken = 1;
      }

/*
 * Bit assignment test - filters out PS/2 i8042's in AT mode
 */

      if (i8042_toggle_aux(0)) {
            printk(KERN_WARNING "Failed to disable AUX port, but continuing anyway... Is this a SiS?\n");
            printk(KERN_WARNING "If AUX port is really absent please use the 'i8042.noaux' option.\n");
      }

      if (i8042_toggle_aux(1))
            return -1;

/*
 * Test AUX IRQ delivery to make sure BIOS did not grab the IRQ and
 * used it for a PCI card or somethig else.
 */

      if (i8042_noloop || aux_loop_broken) {
/*
 * Without LOOP command we can't test AUX IRQ delivery. Assume the port
 * is working and hope we are right.
 */
            retval = 0;
            goto out;
      }

      if (request_irq(I8042_AUX_IRQ, i8042_aux_test_irq, IRQF_SHARED,
                  "i8042", i8042_platform_device))
            goto out;

      irq_registered = 1;

      if (i8042_enable_aux_port())
            goto out;

      spin_lock_irqsave(&i8042_lock, flags);

      init_completion(&i8042_aux_irq_delivered);
      i8042_irq_being_tested = 1;

      param = 0xa5;
      retval = __i8042_command(&param, I8042_CMD_AUX_LOOP & 0xf0ff);

      spin_unlock_irqrestore(&i8042_lock, flags);

      if (retval)
            goto out;

      if (wait_for_completion_timeout(&i8042_aux_irq_delivered,
                              msecs_to_jiffies(250)) == 0) {
/*
 * AUX IRQ was never delivered so we need to flush the controller to
 * get rid of the byte we put there; otherwise keyboard may not work.
 */
            i8042_flush();
            retval = -1;
      }

 out:

/*
 * Disable the interface.
 */

      i8042_ctr |= I8042_CTR_AUXDIS;
      i8042_ctr &= ~I8042_CTR_AUXINT;

      if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
            retval = -1;

      if (irq_registered)
            free_irq(I8042_AUX_IRQ, i8042_platform_device);

      return retval;
}

static int i8042_controller_check(void)
{
      if (i8042_flush() == I8042_BUFFER_SIZE) {
            printk(KERN_ERR "i8042.c: No controller found.\n");
            return -ENODEV;
      }

      return 0;
}

static int i8042_controller_selftest(void)
{
      unsigned char param;

      if (!i8042_reset)
            return 0;

      if (i8042_command(&param, I8042_CMD_CTL_TEST)) {
            printk(KERN_ERR "i8042.c: i8042 controller self test timeout.\n");
            return -ENODEV;
      }

      if (param != I8042_RET_CTL_TEST) {
            printk(KERN_ERR "i8042.c: i8042 controller selftest failed. (%#x != %#x)\n",
                   param, I8042_RET_CTL_TEST);
            return -EIO;
      }

      return 0;
}

/*
 * i8042_controller init initializes the i8042 controller, and,
 * most importantly, sets it into non-xlated mode if that's
 * desired.
 */

static int i8042_controller_init(void)
{
      unsigned long flags;

/*
 * Save the CTR for restoral on unload / reboot.
 */

      if (i8042_command(&i8042_ctr, I8042_CMD_CTL_RCTR)) {
            printk(KERN_ERR "i8042.c: Can't read CTR while initializing i8042.\n");
            return -EIO;
      }

      i8042_initial_ctr = i8042_ctr;

/*
 * Disable the keyboard interface and interrupt.
 */

      i8042_ctr |= I8042_CTR_KBDDIS;
      i8042_ctr &= ~I8042_CTR_KBDINT;

/*
 * Handle keylock.
 */

      spin_lock_irqsave(&i8042_lock, flags);
      if (~i8042_read_status() & I8042_STR_KEYLOCK) {
            if (i8042_unlock)
                  i8042_ctr |= I8042_CTR_IGNKEYLOCK;
            else
                  printk(KERN_WARNING "i8042.c: Warning: Keylock active.\n");
      }
      spin_unlock_irqrestore(&i8042_lock, flags);

/*
 * If the chip is configured into nontranslated mode by the BIOS, don't
 * bother enabling translating and be happy.
 */

      if (~i8042_ctr & I8042_CTR_XLATE)
            i8042_direct = 1;

/*
 * Set nontranslated mode for the kbd interface if requested by an option.
 * After this the kbd interface becomes a simple serial in/out, like the aux
 * interface is. We don't do this by default, since it can confuse notebook
 * BIOSes.
 */

      if (i8042_direct)
            i8042_ctr &= ~I8042_CTR_XLATE;

/*
 * Write CTR back.
 */

      if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
            printk(KERN_ERR "i8042.c: Can't write CTR while initializing i8042.\n");
            return -EIO;
      }

      return 0;
}


/*
 * Reset the controller and reset CRT to the original value set by BIOS.
 */

static void i8042_controller_reset(void)
{
      i8042_flush();

/*
 * Disable both KBD and AUX interfaces so they don't get in the way
 */

      i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
      i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);

/*
 * Disable MUX mode if present.
 */

      if (i8042_mux_present)
            i8042_set_mux_mode(0, NULL);

/*
 * Reset the controller if requested.
 */

      i8042_controller_selftest();

/*
 * Restore the original control register setting.
 */

      if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
            printk(KERN_WARNING "i8042.c: Can't restore CTR.\n");
}


/*
 * i8042_panic_blink() will flash the keyboard LEDs and is called when
 * kernel panics. Flashing LEDs is useful for users running X who may
 * not see the console and will help distingushing panics from "real"
 * lockups.
 *
 * Note that DELAY has a limit of 10ms so we will not get stuck here
 * waiting for KBC to free up even if KBD interrupt is off
 */

#define DELAY do { mdelay(1); if (++delay > 10) return delay; } while(0)

static long i8042_panic_blink(long count)
{
      long delay = 0;
      static long last_blink;
      static char led;

      /*
       * We expect frequency to be about 1/2s. KDB uses about 1s.
       * Make sure they are different.
       */
      if (!i8042_blink_frequency)
            return 0;
      if (count - last_blink < i8042_blink_frequency)
            return 0;

      led ^= 0x01 | 0x04;
      while (i8042_read_status() & I8042_STR_IBF)
            DELAY;
      dbg("%02x -> i8042 (panic blink)", 0xed);
      i8042_suppress_kbd_ack = 2;
      i8042_write_data(0xed); /* set leds */
      DELAY;
      while (i8042_read_status() & I8042_STR_IBF)
            DELAY;
      DELAY;
      dbg("%02x -> i8042 (panic blink)", led);
      i8042_write_data(led);
      DELAY;
      last_blink = count;
      return delay;
}

#undef DELAY

#ifdef CONFIG_PM
/*
 * Here we try to restore the original BIOS settings. We only want to
 * do that once, when we really suspend, not when we taking memory
 * snapshot for swsusp (in this case we'll perform required cleanup
 * as part of shutdown process).
 */

static int i8042_suspend(struct platform_device *dev, pm_message_t state)
{
      if (dev->dev.power.power_state.event != state.event) {
            if (state.event == PM_EVENT_SUSPEND)
                  i8042_controller_reset();

            dev->dev.power.power_state = state;
      }

      return 0;
}


/*
 * Here we try to reset everything back to a state in which suspended
 */

static int i8042_resume(struct platform_device *dev)
{
      int error;

/*
 * Do not bother with restoring state if we haven't suspened yet
 */
      if (dev->dev.power.power_state.event == PM_EVENT_ON)
            return 0;

      error = i8042_controller_check();
      if (error)
            return error;

      error = i8042_controller_selftest();
      if (error)
            return error;

/*
 * Restore original CTR value and disable all ports
 */

      i8042_ctr = i8042_initial_ctr;
      if (i8042_direct)
            i8042_ctr &= ~I8042_CTR_XLATE;
      i8042_ctr |= I8042_CTR_AUXDIS | I8042_CTR_KBDDIS;
      i8042_ctr &= ~(I8042_CTR_AUXINT | I8042_CTR_KBDINT);
      if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
            printk(KERN_ERR "i8042: Can't write CTR to resume\n");
            return -EIO;
      }

      if (i8042_mux_present) {
            if (i8042_set_mux_mode(1, NULL) || i8042_enable_mux_ports())
                  printk(KERN_WARNING
                        "i8042: failed to resume active multiplexor, "
                        "mouse won't work.\n");
      } else if (i8042_ports[I8042_AUX_PORT_NO].serio)
            i8042_enable_aux_port();

      if (i8042_ports[I8042_KBD_PORT_NO].serio)
            i8042_enable_kbd_port();

      i8042_interrupt(0, NULL);

      dev->dev.power.power_state = PMSG_ON;

      return 0;
}
#endif /* CONFIG_PM */

/*
 * We need to reset the 8042 back to original mode on system shutdown,
 * because otherwise BIOSes will be confused.
 */

static void i8042_shutdown(struct platform_device *dev)
{
      i8042_controller_reset();
}

static int __devinit i8042_create_kbd_port(void)
{
      struct serio *serio;
      struct i8042_port *port = &i8042_ports[I8042_KBD_PORT_NO];

      serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
      if (!serio)
            return -ENOMEM;

      serio->id.type          = i8042_direct ? SERIO_8042 : SERIO_8042_XL;
      serio->write            = i8042_dumbkbd ? NULL : i8042_kbd_write;
      serio->start            = i8042_start;
      serio->stop       = i8042_stop;
      serio->port_data  = port;
      serio->dev.parent = &i8042_platform_device->dev;
      strlcpy(serio->name, "i8042 KBD port", sizeof(serio->name));
      strlcpy(serio->phys, I8042_KBD_PHYS_DESC, sizeof(serio->phys));

      port->serio = serio;
      port->irq = I8042_KBD_IRQ;

      return 0;
}

static int __devinit i8042_create_aux_port(int idx)
{
      struct serio *serio;
      int port_no = idx < 0 ? I8042_AUX_PORT_NO : I8042_MUX_PORT_NO + idx;
      struct i8042_port *port = &i8042_ports[port_no];

      serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
      if (!serio)
            return -ENOMEM;

      serio->id.type          = SERIO_8042;
      serio->write            = i8042_aux_write;
      serio->start            = i8042_start;
      serio->stop       = i8042_stop;
      serio->port_data  = port;
      serio->dev.parent = &i8042_platform_device->dev;
      if (idx < 0) {
            strlcpy(serio->name, "i8042 AUX port", sizeof(serio->name));
            strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
      } else {
            snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
            snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);
      }

      port->serio = serio;
      port->mux = idx;
      port->irq = I8042_AUX_IRQ;

      return 0;
}

static void __devinit i8042_free_kbd_port(void)
{
      kfree(i8042_ports[I8042_KBD_PORT_NO].serio);
      i8042_ports[I8042_KBD_PORT_NO].serio = NULL;
}

static void __devinit i8042_free_aux_ports(void)
{
      int i;

      for (i = I8042_AUX_PORT_NO; i < I8042_NUM_PORTS; i++) {
            kfree(i8042_ports[i].serio);
            i8042_ports[i].serio = NULL;
      }
}

static void __devinit i8042_register_ports(void)
{
      int i;

      for (i = 0; i < I8042_NUM_PORTS; i++) {
            if (i8042_ports[i].serio) {
                  printk(KERN_INFO "serio: %s at %#lx,%#lx irq %d\n",
                        i8042_ports[i].serio->name,
                        (unsigned long) I8042_DATA_REG,
                        (unsigned long) I8042_COMMAND_REG,
                        i8042_ports[i].irq);
                  serio_register_port(i8042_ports[i].serio);
            }
      }
}

static void __devexit i8042_unregister_ports(void)
{
      int i;

      for (i = 0; i < I8042_NUM_PORTS; i++) {
            if (i8042_ports[i].serio) {
                  serio_unregister_port(i8042_ports[i].serio);
                  i8042_ports[i].serio = NULL;
            }
      }
}

static void i8042_free_irqs(void)
{
      if (i8042_aux_irq_registered)
            free_irq(I8042_AUX_IRQ, i8042_platform_device);
      if (i8042_kbd_irq_registered)
            free_irq(I8042_KBD_IRQ, i8042_platform_device);

      i8042_aux_irq_registered = i8042_kbd_irq_registered = 0;
}

static int __devinit i8042_setup_aux(void)
{
      int (*aux_enable)(void);
      int error;
      int i;

      if (i8042_check_aux())
            return -ENODEV;

      if (i8042_nomux || i8042_check_mux()) {
            error = i8042_create_aux_port(-1);
            if (error)
                  goto err_free_ports;
            aux_enable = i8042_enable_aux_port;
      } else {
            for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
                  error = i8042_create_aux_port(i);
                  if (error)
                        goto err_free_ports;
            }
            aux_enable = i8042_enable_mux_ports;
      }

      error = request_irq(I8042_AUX_IRQ, i8042_interrupt, IRQF_SHARED,
                      "i8042", i8042_platform_device);
      if (error)
            goto err_free_ports;

      if (aux_enable())
            goto err_free_irq;

      i8042_aux_irq_registered = 1;
      return 0;

 err_free_irq:
      free_irq(I8042_AUX_IRQ, i8042_platform_device);
 err_free_ports:
      i8042_free_aux_ports();
      return error;
}

static int __devinit i8042_setup_kbd(void)
{
      int error;

      error = i8042_create_kbd_port();
      if (error)
            return error;

      error = request_irq(I8042_KBD_IRQ, i8042_interrupt, IRQF_SHARED,
                      "i8042", i8042_platform_device);
      if (error)
            goto err_free_port;

      error = i8042_enable_kbd_port();
      if (error)
            goto err_free_irq;

      i8042_kbd_irq_registered = 1;
      return 0;

 err_free_irq:
      free_irq(I8042_KBD_IRQ, i8042_platform_device);
 err_free_port:
      i8042_free_kbd_port();
      return error;
}

static int __devinit i8042_probe(struct platform_device *dev)
{
      int error;

      error = i8042_controller_selftest();
      if (error)
            return error;

      error = i8042_controller_init();
      if (error)
            return error;

      if (!i8042_noaux) {
            error = i8042_setup_aux();
            if (error && error != -ENODEV && error != -EBUSY)
                  goto out_fail;
      }

      if (!i8042_nokbd) {
            error = i8042_setup_kbd();
            if (error)
                  goto out_fail;
      }

/*
 * Ok, everything is ready, let's register all serio ports
 */
      i8042_register_ports();

      return 0;

 out_fail:
      i8042_free_aux_ports(); /* in case KBD failed but AUX not */
      i8042_free_irqs();
      i8042_controller_reset();

      return error;
}

static int __devexit i8042_remove(struct platform_device *dev)
{
      i8042_unregister_ports();
      i8042_free_irqs();
      i8042_controller_reset();

      return 0;
}

static struct platform_driver i8042_driver = {
      .driver           = {
            .name = "i8042",
            .owner      = THIS_MODULE,
      },
      .probe            = i8042_probe,
      .remove           = __devexit_p(i8042_remove),
      .shutdown   = i8042_shutdown,
#ifdef CONFIG_PM
      .suspend    = i8042_suspend,
      .resume           = i8042_resume,
#endif
};

static int __init i8042_init(void)
{
      int err;

      dbg_init();

      err = i8042_platform_init();
      if (err)
            return err;

      err = i8042_controller_check();
      if (err)
            goto err_platform_exit;

      err = platform_driver_register(&i8042_driver);
      if (err)
            goto err_platform_exit;

      i8042_platform_device = platform_device_alloc("i8042", -1);
      if (!i8042_platform_device) {
            err = -ENOMEM;
            goto err_unregister_driver;
      }

      err = platform_device_add(i8042_platform_device);
      if (err)
            goto err_free_device;

      panic_blink = i8042_panic_blink;

      return 0;

 err_free_device:
      platform_device_put(i8042_platform_device);
 err_unregister_driver:
      platform_driver_unregister(&i8042_driver);
 err_platform_exit:
      i8042_platform_exit();

      return err;
}

static void __exit i8042_exit(void)
{
      platform_device_unregister(i8042_platform_device);
      platform_driver_unregister(&i8042_driver);
      i8042_platform_exit();

      panic_blink = NULL;
}

module_init(i8042_init);
module_exit(i8042_exit);

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