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/*
 *  i8042 keyboard and mouse controller driver for Linux
 *
 *  Copyright (c) 1999-2002 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 <linuxcomp.h>

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/config.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/serio.h>

#include <asm/io.h>

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

MODULE_PARM(i8042_noaux, "1i");
MODULE_PARM(i8042_nomux, "1i");
MODULE_PARM(i8042_unlock, "1i");
MODULE_PARM(i8042_reset, "1i");
MODULE_PARM(i8042_direct, "1i");
MODULE_PARM(i8042_dumbkbd, "1i");

static int i8042_reset;
static int i8042_noaux;
static int i8042_nomux;
static int i8042_unlock;
static int i8042_direct;
static int i8042_dumbkbd;

#undef DEBUG
#include "i8042.h"

spinlock_t i8042_lock = SPIN_LOCK_UNLOCKED;

struct i8042_values {
        int irq;
        unsigned char disable;
        unsigned char irqen;
        unsigned char exists;
        signed char mux;
        unsigned char *name;
        unsigned char *phys;
};

static struct serio i8042_kbd_port;
static struct serio i8042_aux_port;
static unsigned char i8042_initial_ctr;
static unsigned char i8042_ctr;
static unsigned char i8042_mux_open;
struct timer_list i8042_timer;

/*
 * 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.
 */

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;
        int i = 0;

        spin_lock_irqsave(&i8042_lock, flags);

        while ((i8042_read_status() & I8042_STR_OBF) && (i++ < I8042_BUFFER_SIZE)) {
                data = i8042_read_data();
                dbg("%02x <- i8042 (flush, %s)", data,
                        i8042_read_status() & 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;

        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 *port, unsigned char c)
{
        struct i8042_values *values = port->driver;
        int retval;

/*
 * Send the byte out.
 */

        if (values->mux == -1)
                retval = i8042_command(&c, I8042_CMD_AUX_SEND);
        else
                retval = i8042_command(&c, I8042_CMD_MUX_SEND + values->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_open() is called when a port is open by the higher layer.
 * It allocates the interrupt and enables it in the chip.
 */

static int i8042_open(struct serio *port)
{
        struct i8042_values *values = port->driver;

        i8042_flush();

        if (values->mux != -1)
                if (i8042_mux_open++)
                        return 0;

        if (request_irq(values->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", values->irq, values->name);
                values->exists = 0;
                serio_unregister_port(port);
                return -1;
        }

        i8042_ctr |= values->irqen;

        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
                printk(KERN_ERR "i8042.c: Can't write CTR while opening %s.\n", values->name);
                return -1;
        }

        i8042_interrupt(0, NULL, NULL);

        return 0;
}

/*
 * 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 *port)
{
        struct i8042_values *values = port->driver;

        if (values->mux != -1)
                if (--i8042_mux_open)
                        return;

        i8042_ctr &= ~values->irqen;

        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
                printk(KERN_ERR "i8042.c: Can't write CTR while closing %s.\n", values->name);
                return;
        }

        free_irq(values->irq, i8042_request_irq_cookie);

        i8042_flush();
}

/*
 * Structures for registering the devices in the serio.c module.
 */

static struct i8042_values i8042_kbd_values = {
        .irqen =        I8042_CTR_KBDINT,
        .disable =      I8042_CTR_KBDDIS,
        .name =         "KBD",
        .mux =          -1,
};

static struct serio i8042_kbd_port =
{
        .type =         SERIO_8042_XL,
        .write =        i8042_kbd_write,
        .open =         i8042_open,
        .close =        i8042_close,
        .driver =       &i8042_kbd_values,
        .name =         "i8042 Kbd Port",
        .phys =         I8042_KBD_PHYS_DESC,
};

static struct i8042_values i8042_aux_values = {
        .irqen =        I8042_CTR_AUXINT,
        .disable =      I8042_CTR_AUXDIS,
        .name =         "AUX",
        .mux =          -1,
};

static struct serio i8042_aux_port =
{
        .type =         SERIO_8042,
        .write =        i8042_aux_write,
        .open =         i8042_open,
        .close =        i8042_close,
        .driver =       &i8042_aux_values,
        .name =         "i8042 Aux Port",
        .phys =         I8042_AUX_PHYS_DESC,
};

static struct i8042_values i8042_mux_values[4];
static struct serio i8042_mux_port[4];
static char i8042_mux_names[4][32];
static char i8042_mux_short[4][16];
static char i8042_mux_phys[4][32];

/*
 * 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)
{
        unsigned long flags;
        unsigned char str, data;
        unsigned int dfl;
        struct {
                int data;
                int str;
        } buffer[I8042_BUFFER_SIZE];
        int i, j = 0;

        spin_lock_irqsave(&i8042_lock, flags);

        while (j < I8042_BUFFER_SIZE &&
            (buffer[j].str = i8042_read_status()) & I8042_STR_OBF)
                buffer[j++].data = i8042_read_data();

        spin_unlock_irqrestore(&i8042_lock, flags);

        for (i = 0; i < j; i++) {

                str = buffer[i].str;
                data = buffer[i].data;

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

                if (i8042_mux_values[0].exists && (str & I8042_STR_AUXDATA)) {

                        if (str & I8042_STR_MUXERR) {
                                switch (data) {
                                        case 0xfd:
                                        case 0xfe: dfl = SERIO_TIMEOUT; break;
                                        case 0xff: dfl = SERIO_PARITY; break;
                                }
                                data = 0xfe;
                        } else dfl = 0;

                        dbg("%02x <- i8042 (interrupt, aux%d, %d%s%s)",
                                data, (str >> 6), irq,
                                dfl & SERIO_PARITY ? ", bad parity" : "",
                                dfl & SERIO_TIMEOUT ? ", timeout" : "");

                        serio_interrupt(i8042_mux_port + ((str >> 6) & 3), data, dfl, regs);
                        continue;
                }

                dbg("%02x <- i8042 (interrupt, %s, %d%s%s)",
                        data, (str & I8042_STR_AUXDATA) ? "aux" : "kbd", irq,
                        dfl & SERIO_PARITY ? ", bad parity" : "",
                        dfl & SERIO_TIMEOUT ? ", timeout" : "");

                if (i8042_aux_values.exists && (str & I8042_STR_AUXDATA)) {
                        serio_interrupt(&i8042_aux_port, data, dfl, regs);
                        continue;
                }

                if (!i8042_kbd_values.exists)
                        continue;

                serio_interrupt(&i8042_kbd_port, data, dfl, regs);
        }

        return IRQ_RETVAL(j);
}

/*
 * i8042_controller init initializes the i8042 controller, and,
 * most importantly, sets it into non-xlated mode if that's
 * desired.
 */
       
static int __init i8042_controller_init(void)
{

/*
 * Test the i8042. We need to know if it thinks it's working correctly
 * before doing anything else.
 */

        i8042_flush();

        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.
 */

        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");
        }

/*
 * 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;
                i8042_kbd_port.type = SERIO_8042;
        }

/*
 * 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;
}

/*
 * Here we try to reset everything back to a state in which the BIOS will be
 * able to talk to the hardware when rebooting.
 */

void i8042_controller_cleanup(void)
{
        int i;

        i8042_flush();

/*
 * Reset anything that is connected to the ports.
 */

        if (i8042_kbd_values.exists)
                serio_cleanup(&i8042_kbd_port);

        if (i8042_aux_values.exists)
                serio_cleanup(&i8042_aux_port);

        for (i = 0; i < 4; i++)
                if (i8042_mux_values[i].exists)
                        serio_cleanup(i8042_mux_port + i);

/*
 * Reset the controller.
 */

        if (i8042_reset) {
                unsigned char param;

                if (i8042_command(&param, I8042_CMD_CTL_TEST))
                        printk(KERN_ERR "i8042.c: i8042 controller reset timeout.\n");
        }

/*
 * 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");

}

/*
 * 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(struct i8042_values *values)
{
        unsigned char param;
        static int i8042_check_mux_cookie;
        int i;

/*
 * Check if AUX irq is available.
 */

        if (request_irq(values->irq, i8042_interrupt, SA_SHIRQ,
                                "i8042", &i8042_check_mux_cookie))
                return -1;
        free_irq(values->irq, &i8042_check_mux_cookie);

/*
 * 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 = 0x56;
        if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0xa9)
                return -1;
        param = 0xa4;
        if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param == 0x5b)
                return -1;

        printk(KERN_INFO "i8042.c: Detected active multiplexing controller, rev %d.%d.\n",
                (~param >> 4) & 0xf, ~param & 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))
                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_aux() applies as much paranoia as it can at detecting
 * the presence of an AUX interface.
 */

static int __init i8042_check_aux(struct i8042_values *values)
{
        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(values->irq, i8042_interrupt, SA_SHIRQ,
                                "i8042", &i8042_check_aux_cookie))
                return -1;
        free_irq(values->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))
                return -1;     

        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_values *values, struct serio *port)
{
        values->exists = 1;

        i8042_ctr &= ~values->disable;

        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
                printk(KERN_WARNING "i8042.c: Can't write CTR while registering.\n");
                return -1;
        }

        serio_register_port(port);

        printk(KERN_INFO "serio: i8042 %s port at %#lx,%#lx irq %d\n",
               values->name,
               (unsigned long) I8042_DATA_REG,
               (unsigned long) I8042_COMMAND_REG,
               values->irq);

        return 0;
}

static void i8042_timer_func(unsigned long data)
{
        i8042_interrupt(0, NULL, NULL);
        mod_timer(&i8042_timer, jiffies26 + I8042_POLL_PERIOD);
}

#ifndef MODULE
static int __init i8042_setup_reset(char *str)
{
        i8042_reset = 1;
        return 1;
}
static int __init i8042_setup_noaux(char *str)
{
        i8042_noaux = 1;
        i8042_nomux = 1;
        return 1;
}
static int __init i8042_setup_nomux(char *str)
{
        i8042_nomux = 1;
        return 1;
}
static int __init i8042_setup_unlock(char *str)
{
        i8042_unlock = 1;
        return 1;
}
static int __init i8042_setup_direct(char *str)
{
        i8042_direct = 1;
        return 1;
}
static int __init i8042_setup_dumbkbd(char *str)
{
        i8042_dumbkbd = 1;
        return 1;
}

__setup("i8042_reset", i8042_setup_reset);
__setup("i8042_noaux", i8042_setup_noaux);
__setup("i8042_nomux", i8042_setup_nomux);
__setup("i8042_unlock", i8042_setup_unlock);
__setup("i8042_direct", i8042_setup_direct);
__setup("i8042_dumbkbd", i8042_setup_dumbkbd);
#endif

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

static int i8042_notify_sys(struct notifier_block *this, unsigned long code,
                            void *unused)
{
        if (code==SYS_DOWN || code==SYS_HALT)
                i8042_controller_cleanup();
        return NOTIFY_DONE;
}

static struct notifier_block i8042_notifier=
{
        i8042_notify_sys,
        NULL,
        0
};

static void __init i8042_init_mux_values(struct i8042_values *values, struct serio *port, int index)
{
        memcpy(port, &i8042_aux_port, sizeof(struct serio));
        memcpy(values, &i8042_aux_values, sizeof(struct i8042_values));
        sprintf26(i8042_mux_names[index], "i8042 Aux-%d Port", index);
        sprintf26(i8042_mux_phys[index], I8042_MUX_PHYS_DESC, index + 1);
        sprintf26(i8042_mux_short[index], "AUX%d", index);
        port->name = i8042_mux_names[index];
        port->phys = i8042_mux_phys[index];
        port->driver = values;
        values->name = i8042_mux_short[index];
        values->mux = index;
}

int __init i8042_init(void)
{
        int i;

        dbg_init();

        if (i8042_platform_init())
                return -EBUSY;

        i8042_aux_values.irq = I8042_AUX_IRQ;
        i8042_kbd_values.irq = I8042_KBD_IRQ;

        if (i8042_controller_init())
                return -ENODEV;

        if (i8042_dumbkbd)
                i8042_kbd_port.write = NULL;

        for (i = 0; i < 4; i++)
                i8042_init_mux_values(i8042_mux_values + i, i8042_mux_port + i, i);

        if (!i8042_nomux && !i8042_check_mux(&i8042_aux_values))
                for (i = 0; i < 4; i++)
                        i8042_port_register(i8042_mux_values + i, i8042_mux_port + i);
        else
                if (!i8042_noaux && !i8042_check_aux(&i8042_aux_values))
                        i8042_port_register(&i8042_aux_values, &i8042_aux_port);

        i8042_port_register(&i8042_kbd_values, &i8042_kbd_port);

        init_timer(&i8042_timer);
        i8042_timer.function = i8042_timer_func;
        mod_timer(&i8042_timer, jiffies26 + I8042_POLL_PERIOD);

        //!!!register_reboot_notifier(&i8042_notifier);

        return 0;
}

void __exit i8042_exit(void)
{
        int i;

        //!!!unregister_reboot_notifier(&i8042_notifier);

        del_timer(&i8042_timer);

        i8042_controller_cleanup();
       
        if (i8042_kbd_values.exists)
                serio_unregister_port(&i8042_kbd_port);

        if (i8042_aux_values.exists)
                serio_unregister_port(&i8042_aux_port);
       
        for (i = 0; i < 4; i++)
                if (i8042_mux_values[i].exists)
                        serio_unregister_port(i8042_mux_port + i);

        i8042_platform_exit();
}

module_init(i8042_init);
module_exit(i8042_exit);