1 files changed, 1116 insertions, 0 deletions

diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
new file mode 100644
index 000000000000..8e63e464d361
--- /dev/null
+++ b/drivers/input/serio/i8042.c
@@ -0,0 +1,1116 @@
+/*
+ *  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/config.h>
+#include <linux/init.h>
+#include <linux/serio.h>
+#include <linux/err.h>
+#include <linux/rcupdate.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_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
+
+__obsolete_setup("i8042_noaux");
+__obsolete_setup("i8042_nomux");
+__obsolete_setup("i8042_unlock");
+__obsolete_setup("i8042_reset");
+__obsolete_setup("i8042_direct");
+__obsolete_setup("i8042_dumbkbd");
+
+#include "i8042.h"
+
+static DEFINE_SPINLOCK(i8042_lock);
+
+struct i8042_port {
+        struct serio *serio;
+        int irq;
+        unsigned char disable;
+        unsigned char irqen;
+        unsigned char exists;
+        signed char mux;
+        char name[8];
+};
+
+#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] = {
+        {
+                .disable        = I8042_CTR_KBDDIS,
+                .irqen          = I8042_CTR_KBDINT,
+                .mux            = -1,
+                .name           = "KBD",
+        },
+        {
+                .disable        = I8042_CTR_AUXDIS,
+                .irqen          = I8042_CTR_AUXINT,
+                .mux            = -1,
+                .name           = "AUX",
+        }
+};
+
+static unsigned char i8042_initial_ctr;
+static unsigned char i8042_ctr;
+static unsigned char i8042_mux_open;
+static unsigned char i8042_mux_present;
+static struct timer_list i8042_timer;
+static struct platform_device *i8042_platform_device;
+
+
+/*
+ * Shared IRQ's require a device pointer, but this driver doesn't support
+ * multiple devices
+ */
+#define i8042_request_irq_cookie (&i8042_timer)
+
+static irqreturn_t i8042_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+
+/*
+ * 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)
+{
+        unsigned long flags;
+        int retval = 0, i = 0;
+
+        if (i8042_noloop && command == I8042_CMD_AUX_LOOP)
+                return -1;
+
+        spin_lock_irqsave(&i8042_lock, flags);
+
+        retval = i8042_wait_write();
+        if (!retval) {
+                dbg("%02x -> i8042 (command)", command & 0xff);
+                i8042_write_command(command & 0xff);
+        }
+
+        if (!retval)
+                for (i = 0; i < ((command >> 12) & 0xf); i++) {
+                        if ((retval = i8042_wait_write())) break;
+                        dbg("%02x -> i8042 (parameter)", param[i]);
+                        i8042_write_data(param[i]);
+                }
+
+        if (!retval)
+                for (i = 0; i < ((command >> 8) & 0xf); i++) {
+                        if ((retval = i8042_wait_read())) break;
+                        if (i8042_read_status() & I8042_STR_AUXDATA)
+                                param[i] = ~i8042_read_data();
+                        else
+                                param[i] = i8042_read_data();
+                        dbg("%02x <- i8042 (return)", param[i]);
+                }
+
+        spin_unlock_irqrestore(&i8042_lock, flags);
+
+        if (retval)
+                dbg("     -- i8042 (timeout)");
+
+        return retval;
+}
+
+/*
+ * 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;
+        int retval;
+
+/*
+ * Send the byte out.
+ */
+
+        if (port->mux == -1)
+                retval = i8042_command(&c, I8042_CMD_AUX_SEND);
+        else
+                retval = i8042_command(&c, I8042_CMD_MUX_SEND + port->mux);
+
+/*
+ * Make sure the interrupt happens and the character is received even
+ * in the case the IRQ isn't wired, so that we can receive further
+ * characters later.
+ */
+
+        i8042_interrupt(0, NULL, NULL);
+        return retval;
+}
+
+/*
+ * i8042_activate_port() enables port on a chip.
+ */
+
+static int i8042_activate_port(struct i8042_port *port)
+{
+        if (!port->serio)
+                return -1;
+
+        i8042_flush();
+
+        /*
+         * Enable port again here because it is disabled if we are
+         * resuming (normally it is enabled already).
+         */
+        i8042_ctr &= ~port->disable;
+
+        i8042_ctr |= port->irqen;
+
+        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
+                i8042_ctr &= ~port->irqen;
+                return -1;
+        }
+
+        return 0;
+}
+
+
+/*
+ * i8042_open() is called when a port is open by the higher layer.
+ * It allocates the interrupt and calls i8042_enable_port.
+ */
+
+static int i8042_open(struct serio *serio)
+{
+        struct i8042_port *port = serio->port_data;
+
+        if (port->mux != -1)
+                if (i8042_mux_open++)
+                        return 0;
+
+        if (request_irq(port->irq, i8042_interrupt,
+                        SA_SHIRQ, "i8042", i8042_request_irq_cookie)) {
+                printk(KERN_ERR "i8042.c: Can't get irq %d for %s, unregistering the port.\n", port->irq, port->name);
+                goto irq_fail;
+        }
+
+        if (i8042_activate_port(port)) {
+                printk(KERN_ERR "i8042.c: Can't activate %s, unregistering the port\n", port->name);
+                goto activate_fail;
+        }
+
+        i8042_interrupt(0, NULL, NULL);
+
+        return 0;
+
+activate_fail:
+        free_irq(port->irq, i8042_request_irq_cookie);
+
+irq_fail:
+        serio_unregister_port_delayed(serio);
+
+        return -1;
+}
+
+/*
+ * i8042_close() frees the interrupt, so that it can possibly be used
+ * by another driver. We never know - if the user doesn't have a mouse,
+ * the BIOS could have used the AUX interrupt for PCI.
+ */
+
+static void i8042_close(struct serio *serio)
+{
+        struct i8042_port *port = serio->port_data;
+
+        if (port->mux != -1)
+                if (--i8042_mux_open)
+                        return;
+
+        i8042_ctr &= ~port->irqen;
+
+        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
+                printk(KERN_WARNING "i8042.c: Can't write CTR while closing %s.\n", port->name);
+/*
+ * We still want to continue and free IRQ so if more data keeps coming in
+ * kernel will just ignore the irq.
+ */
+        }
+
+        free_irq(port->irq, i8042_request_irq_cookie);
+
+        i8042_flush();
+}
+
+/*
+ * 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_kernel();
+        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 pt_regs *regs)
+{
+        struct i8042_port *port;
+        unsigned long flags;
+        unsigned char str, data;
+        unsigned int dfl;
+        unsigned int port_no;
+        int ret;
+
+        mod_timer(&i8042_timer, jiffies + I8042_POLL_PERIOD);
+
+        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);
+                        switch (data) {
+                                default:
+/*
+ * 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 KBC just 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 will assume that the data came from the same serio last byte
+ * was transmitted (if transmission happened not too long ago).
+ */
+                                        if (time_before(jiffies, last_transmit + HZ/10)) {
+                                                str = last_str;
+                                                break;
+                                        }
+                                        /* fall through - report timeout */
+                                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, %s, %d%s%s)",
+            data, port->name, irq,
+            dfl & SERIO_PARITY ? ", bad parity" : "",
+            dfl & SERIO_TIMEOUT ? ", timeout" : "");
+
+        if (likely(port->exists))
+                serio_interrupt(port->serio, data, dfl, regs);
+
+        ret = 1;
+out:
+        return IRQ_RETVAL(ret);
+}
+
+/*
+ * 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. Note that we negate mouseport
+ * command responses for the i8042_check_aux() routine.
+ */
+
+        param = 0xf0;
+        if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0x0f)
+                return -1;
+        param = mode ? 0x56 : 0xf6;
+        if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != (mode ? 0xa9 : 0x09))
+                return -1;
+        param = mode ? 0xa4 : 0xa5;
+        if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param == (mode ? 0x5b : 0x5a))
+                return -1;
+
+        if (mux_version)
+                *mux_version = ~param;
+
+        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;
+/*
+ * 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 -1;
+        }
+
+/*
+ * Enable all muxed ports.
+ */
+
+        for (i = 0; i < 4; i++) {
+                i8042_command(&param, I8042_CMD_MUX_PFX + i);
+                i8042_command(&param, I8042_CMD_AUX_ENABLE);
+        }
+
+        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 __init 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);
+
+        if (i8042_enable_mux_ports())
+                return -1;
+
+        i8042_mux_present = 1;
+        return 0;
+}
+
+
+/*
+ * i8042_check_aux() applies as much paranoia as it can at detecting
+ * the presence of an AUX interface.
+ */
+
+static int __init i8042_check_aux(void)
+{
+        unsigned char param;
+        static int i8042_check_aux_cookie;
+
+/*
+ * Check if AUX irq is available. If it isn't, then there is no point
+ * in trying to detect AUX presence.
+ */
+
+        if (request_irq(i8042_ports[I8042_AUX_PORT_NO].irq, i8042_interrupt,
+                        SA_SHIRQ, "i8042", &i8042_check_aux_cookie))
+                return -1;
+        free_irq(i8042_ports[I8042_AUX_PORT_NO].irq, &i8042_check_aux_cookie);
+
+/*
+ * 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;
+        if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0xa5) {
+
+/*
+ * 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;
+        }
+
+/*
+ * Bit assignment test - filters out PS/2 i8042's in AT mode
+ */
+
+        if (i8042_command(&param, I8042_CMD_AUX_DISABLE))
+                return -1;
+        if (i8042_command(&param, I8042_CMD_CTL_RCTR) || (~param & I8042_CTR_AUXDIS)) {
+                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_command(&param, I8042_CMD_AUX_ENABLE))
+                return -1;
+        if (i8042_command(&param, I8042_CMD_CTL_RCTR) || (param & I8042_CTR_AUXDIS))
+                return -1;
+
+/*
+ * Disable the interface.
+ */
+
+        i8042_ctr |= I8042_CTR_AUXDIS;
+        i8042_ctr &= ~I8042_CTR_AUXINT;
+
+        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
+                return -1;
+
+        return 0;
+}
+
+
+/*
+ * i8042_port_register() marks the device as existing,
+ * registers it, and reports to the user.
+ */
+
+static int __init i8042_port_register(struct i8042_port *port)
+{
+        i8042_ctr &= ~port->disable;
+
+        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
+                printk(KERN_WARNING "i8042.c: Can't write CTR while registering.\n");
+                kfree(port->serio);
+                port->serio = NULL;
+                i8042_ctr |= port->disable;
+                return -1;
+        }
+
+        printk(KERN_INFO "serio: i8042 %s port at %#lx,%#lx irq %d\n",
+               port->name,
+               (unsigned long) I8042_DATA_REG,
+               (unsigned long) I8042_COMMAND_REG,
+               port->irq);
+
+        serio_register_port(port->serio);
+
+        return 0;
+}
+
+
+static void i8042_timer_func(unsigned long data)
+{
+        i8042_interrupt(0, NULL, NULL);
+}
+
+
+/*
+ * 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;
+
+/*
+ * Test the i8042. We need to know if it thinks it's working correctly
+ * before doing anything else.
+ */
+
+        if (i8042_flush() == I8042_BUFFER_SIZE) {
+                printk(KERN_ERR "i8042.c: No controller found.\n");
+                return -1;
+        }
+
+        if (i8042_reset) {
+
+                unsigned char param;
+
+                if (i8042_command(&param, I8042_CMD_CTL_TEST)) {
+                        printk(KERN_ERR "i8042.c: i8042 controller self test timeout.\n");
+                        return -1;
+                }
+
+                if (param != I8042_RET_CTL_TEST) {
+                        printk(KERN_ERR "i8042.c: i8042 controller selftest failed. (%#x != %#x)\n",
+                                 param, I8042_RET_CTL_TEST);
+                        return -1;
+                }
+        }
+
+/*
+ * 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 -1;
+        }
+
+        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 -1;
+        }
+
+        return 0;
+}
+
+
+/*
+ * Reset the controller.
+ */
+static void i8042_controller_reset(void)
+{
+        unsigned char param;
+
+/*
+ * Reset the controller if requested.
+ */
+
+        if (i8042_reset)
+                if (i8042_command(&param, I8042_CMD_CTL_TEST))
+                        printk(KERN_ERR "i8042.c: i8042 controller reset timeout.\n");
+
+/*
+ * Disable MUX mode if present.
+ */
+
+        if (i8042_mux_present)
+                i8042_set_mux_mode(0, NULL);
+
+/*
+ * Restore the original control register setting.
+ */
+
+        i8042_ctr = i8042_initial_ctr;
+
+        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
+                printk(KERN_WARNING "i8042.c: Can't restore CTR.\n");
+}
+
+
+/*
+ * Here we try to reset everything back to a state in which the BIOS will be
+ * able to talk to the hardware when rebooting.
+ */
+
+static void i8042_controller_cleanup(void)
+{
+        int i;
+
+        i8042_flush();
+
+/*
+ * Reset anything that is connected to the ports.
+ */
+
+        for (i = 0; i < I8042_NUM_PORTS; i++)
+                if (i8042_ports[i].exists)
+                        serio_cleanup(i8042_ports[i].serio);
+
+        i8042_controller_reset();
+}
+
+
+/*
+ * 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;
+        i8042_write_data(0xed); /* set leds */
+        DELAY;
+        while (i8042_read_status() & I8042_STR_IBF)
+                DELAY;
+        DELAY;
+        i8042_write_data(led);
+        DELAY;
+        last_blink = count;
+        return delay;
+}
+
+#undef DELAY
+
+/*
+ * Here we try to restore the original BIOS settings
+ */
+
+static int i8042_suspend(struct device *dev, pm_message_t state, u32 level)
+{
+        if (level == SUSPEND_DISABLE) {
+                del_timer_sync(&i8042_timer);
+                i8042_controller_reset();
+        }
+
+        return 0;
+}
+
+
+/*
+ * Here we try to reset everything back to a state in which suspended
+ */
+
+static int i8042_resume(struct device *dev, u32 level)
+{
+        int i;
+
+        if (level != RESUME_ENABLE)
+                return 0;
+
+        if (i8042_controller_init()) {
+                printk(KERN_ERR "i8042: resume failed\n");
+                return -1;
+        }
+
+        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");
+
+/*
+ * Activate all ports.
+ */
+
+        for (i = 0; i < I8042_NUM_PORTS; i++)
+                i8042_activate_port(&i8042_ports[i]);
+
+/*
+ * Restart timer (for polling "stuck" data)
+ */
+        mod_timer(&i8042_timer, jiffies + I8042_POLL_PERIOD);
+
+        panic_blink = i8042_panic_blink;
+
+        return 0;
+
+}
+
+/*
+ * We need to reset the 8042 back to original mode on system shutdown,
+ * because otherwise BIOSes will be confused.
+ */
+
+static void i8042_shutdown(struct device *dev)
+{
+        i8042_controller_cleanup();
+}
+
+static struct device_driver i8042_driver = {
+        .name           = "i8042",
+        .bus            = &platform_bus_type,
+        .suspend        = i8042_suspend,
+        .resume         = i8042_resume,
+        .shutdown       = i8042_shutdown,
+};
+
+static void __init i8042_create_kbd_port(void)
+{
+        struct serio *serio;
+        struct i8042_port *port = &i8042_ports[I8042_KBD_PORT_NO];
+
+        serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
+        if (serio) {
+                memset(serio, 0, sizeof(struct serio));
+                serio->id.type          = i8042_direct ? SERIO_8042 : SERIO_8042_XL;
+                serio->write            = i8042_dumbkbd ? NULL : i8042_kbd_write;
+                serio->open             = i8042_open;
+                serio->close            = i8042_close;
+                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;
+                i8042_port_register(port);
+        }
+}
+
+static void __init i8042_create_aux_port(void)
+{
+        struct serio *serio;
+        struct i8042_port *port = &i8042_ports[I8042_AUX_PORT_NO];
+
+        serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
+        if (serio) {
+                memset(serio, 0, sizeof(struct serio));
+                serio->id.type          = SERIO_8042;
+                serio->write            = i8042_aux_write;
+                serio->open             = i8042_open;
+                serio->close            = i8042_close;
+                serio->start            = i8042_start;
+                serio->stop             = i8042_stop;
+                serio->port_data        = port;
+                serio->dev.parent       = &i8042_platform_device->dev;
+                strlcpy(serio->name, "i8042 Aux Port", sizeof(serio->name));
+                strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
+
+                port->serio = serio;
+                i8042_port_register(port);
+        }
+}
+
+static void __init i8042_create_mux_port(int index)
+{
+        struct serio *serio;
+        struct i8042_port *port = &i8042_ports[I8042_MUX_PORT_NO + index];
+
+        serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
+        if (serio) {
+                memset(serio, 0, sizeof(struct serio));
+                serio->id.type          = SERIO_8042;
+                serio->write            = i8042_aux_write;
+                serio->open             = i8042_open;
+                serio->close            = i8042_close;
+                serio->start            = i8042_start;
+                serio->stop             = i8042_stop;
+                serio->port_data        = port;
+                serio->dev.parent       = &i8042_platform_device->dev;
+                snprintf(serio->name, sizeof(serio->name), "i8042 Aux-%d Port", index);
+                snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, index + 1);
+
+                *port = i8042_ports[I8042_AUX_PORT_NO];
+                port->exists = 0;
+                snprintf(port->name, sizeof(port->name), "AUX%d", index);
+                port->mux = index;
+                port->serio = serio;
+                i8042_port_register(port);
+        }
+}
+
+static int __init i8042_init(void)
+{
+        int i;
+        int err;
+
+        dbg_init();
+
+        init_timer(&i8042_timer);
+        i8042_timer.function = i8042_timer_func;
+
+        if (i8042_platform_init())
+                return -EBUSY;
+
+        i8042_ports[I8042_AUX_PORT_NO].irq = I8042_AUX_IRQ;
+        i8042_ports[I8042_KBD_PORT_NO].irq = I8042_KBD_IRQ;
+
+        if (i8042_controller_init()) {
+                i8042_platform_exit();
+                return -ENODEV;
+        }
+
+        err = driver_register(&i8042_driver);
+        if (err) {
+                i8042_platform_exit();
+                return err;
+        }
+
+        i8042_platform_device = platform_device_register_simple("i8042", -1, NULL, 0);
+        if (IS_ERR(i8042_platform_device)) {
+                driver_unregister(&i8042_driver);
+                i8042_platform_exit();
+                return PTR_ERR(i8042_platform_device);
+        }
+
+        if (!i8042_noaux && !i8042_check_aux()) {
+                if (!i8042_nomux && !i8042_check_mux())
+                        for (i = 0; i < I8042_NUM_MUX_PORTS; i++)
+                                i8042_create_mux_port(i);
+                else
+                        i8042_create_aux_port();
+        }
+
+        i8042_create_kbd_port();
+
+        mod_timer(&i8042_timer, jiffies + I8042_POLL_PERIOD);
+
+        return 0;
+}
+
+static void __exit i8042_exit(void)
+{
+        int i;
+
+        i8042_controller_cleanup();
+
+        for (i = 0; i < I8042_NUM_PORTS; i++)
+                if (i8042_ports[i].exists)
+                        serio_unregister_port(i8042_ports[i].serio);
+
+        del_timer_sync(&i8042_timer);
+
+        platform_device_unregister(i8042_platform_device);
+        driver_unregister(&i8042_driver);
+
+        i8042_platform_exit();
+
+        panic_blink = NULL;
+}
+
+module_init(i8042_init);
+module_exit(i8042_exit);