path: root/drivers/input/serio/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/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 =