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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/delay.h>
#include <linux/module.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 <linux/slab.h>
#include <linux/suspend.h>

#include <asm/io.h>

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

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

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

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

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

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

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

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

static bool 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 bool i8042_notimeout;
module_param_named(notimeout, i8042_notimeout, bool, 0);
MODULE_PARM_DESC(notimeout, "Ignore timeouts signalled by i8042");

static bool i8042_kbdreset;
module_param_named(kbdreset, i8042_kbdreset, bool, 0);
MODULE_PARM_DESC(kbdreset, "Reset device connected to KBD port");

#ifdef CONFIG_X86
static bool i8042_dritek;
module_param_named(dritek, i8042_dritek, bool, 0);
MODULE_PARM_DESC(dritek, "Force enable the Dritek keyboard extension");
#endif

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

static bool i8042_unmask_kbd_data;
module_param_named(unmask_kbd_data, i8042_unmask_kbd_data, bool, 0600);
MODULE_PARM_DESC(unmask_kbd_data, "Unconditional enable (may reveal sensitive data) of normally sanitize-filtered kbd data traffic debug log [pre-condition: i8042.debug=1 enabled]");
#endif

static bool i8042_bypass_aux_irq_test;
static char i8042_kbd_firmware_id[128];
static char i8042_aux_firmware_id[128];

#include "i8042.h"

/*
 * i8042_lock protects serialization between i8042_command and
 * the interrupt handler.
 */
static DEFINE_SPINLOCK(i8042_lock);

/*
 * Writers to AUX and KBD ports as well as users issuing i8042_command
 * directly should acquire i8042_mutex (by means of calling
 * i8042_lock_chip() and i8042_unlock_ship() helpers) to ensure that
 * they do not disturb each other (unfortunately in many i8042
 * implementations write to one of the ports will immediately abort
 * command that is being processed by another port).
 */
static DEFINE_MUTEX(i8042_mutex);

struct i8042_port {
	struct serio *serio;
	int irq;
	bool exists;
	bool driver_bound;
	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 bool i8042_mux_present;
static bool i8042_kbd_irq_registered;
static bool i8042_aux_irq_registered;
static unsigned char i8042_suppress_kbd_ack;
static struct platform_device *i8042_platform_device;
static struct notifier_block i8042_kbd_bind_notifier_block;

static irqreturn_t i8042_interrupt(int irq, void *dev_id);
static bool (*i8042_platform_filter)(unsigned char data, unsigned char str,
				     struct serio *serio);

void i8042_lock_chip(void)
{
	mutex_lock(&i8042_mutex);
}
EXPORT_SYMBOL(i8042_lock_chip);

void i8042_unlock_chip(void)
{
	mutex_unlock(&i8042_mutex);
}
EXPORT_SYMBOL(i8042_unlock_chip);

int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
					struct serio *serio))
{
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(&i8042_lock