- 根目录:
- 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 <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");
#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");
#endif
static bool i8042_bypass_aux_irq_test;
#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;
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 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, flags);
if (i8042_platform_filter) {
ret = -EBUSY;
goto out;
}
i8042_platform_filter = filter;
out:
spin_unlock_irqrestore(&i8042_lock, flags);
return ret;
}
EXPORT_SYMBOL(i8042_install_filter);
int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
struct serio *port))
{
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&i8042_lock, flags);
if (i8042_platform_filter != filter) {
ret = -EINVAL;
goto out;
}
i8042_platform_filter = NULL;
out:
spin_unlock_irqrestore(&i8042_lock, flags);
return ret;
}
EXPORT_SYMBOL(i8042_remove_filter);
/*
* 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)\n",
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)\n", 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)\n", param[i]);
i8042_write_data(param[i]);
}
for (i = 0; i < ((command >> 8) & 0xf); i++) {
error = i8042_wait_read();
if (error) {
dbg(" -- i8042 (timeout)\n");
return error;
}
if (command == I8042_CMD_AUX_LOOP &&
!(i8042_read_status() & I8042_STR_AUXDATA)) {
dbg(" -- i8042 (auxerr)\n");
return -1;
}
param[i] = i8042_read_data();
dbg("%02x <- i8042 (return)\n", 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)\n", 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_aux_close attempts to clear AUX or KBD port state by disabling
* and then re-enabling it.
*/
static void i8042_port_close(struct serio *serio)
{
int irq_bit;
int disable_bit;
const char *port_name;
if (serio == i8042_ports[I8042_AUX_PORT_NO].serio) {
irq_bit = I8042_CTR_AUXINT;
disable_bit = I8042_CTR_AUXDIS;
port_name = "AUX";
} else {
irq_bit = I8042_CTR_KBDINT;
disable_bit = I8042_CTR_KBDDIS;
port_name = "KBD";
}
i8042_ctr &= ~irq_bit;
if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
pr_warn("Can't write CTR while closing %s port\n", port_name);
udelay(50);
i8042_ctr &= ~disable_bit;
i8042_ctr |= irq_bit;
if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
pr_err("Can't reactivate %s port\n", port_name);
/*
* See if there is any data appeared while we were messing with
* port state.
*/
i8042_interrupt(0, NULL);
}
/*
* 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 = true;
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 = false;
/*
* We synchronize with both AUX and KBD IRQs because there is
* a (very unlikely) chance that AUX IRQ is raised for KBD port
* and vice versa.
*/
synchronize_irq(I8042_AUX_IRQ);
synchronize_irq(I8042_KBD_IRQ);
port->serio = NULL;
}
/*
* i8042_filter() filters out unwanted bytes from the input data stream.
* It is called from i8042_interrupt and thus is running with interrupts
* off and i8042_lock held.
*/
static bool i8042_filter(unsigned char data, unsigned char str,
struct serio *serio)
{
if (unlikely(i8042_suppress_kbd_ack)) {
if ((~str & I8042_STR_AUXDATA) &&
(data == 0xfa || data == 0xfe)) {
i8042_suppress_kbd_ack--;
dbg("Extra keyboard ACK - filtered out\n");
return true;
}
}
if (i8042_platform_filter && i8042_platform_filter(data, str, serio)) {
dbg("Filtered out by platform filter\n");
return true;
}
return false;
}
/*
* 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;
struct serio *serio;
unsigned long flags;
unsigned char str, data;
unsigned int dfl;
unsigned int port_no;
bool filtered;
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\n", irq);
ret = 0;
goto out;
}
data = i8042_read_data();
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\n",
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 && !i8042_notimeout) ? SERIO_TIMEOUT : 0);
port_no = (str & I8042_STR_AUXDATA) ?
I8042_AUX_PORT_NO : I8042_KBD_PORT_NO;
}
port = &i8042_ports[port_no];
serio = port->exists ? port->serio : NULL;
dbg("%02x <- i8042 (interrupt, %d, %d%s%s)\n",
data, port_no, irq,
dfl & SERIO_PARITY ? ", bad parity" : "",
dfl & SERIO_TIMEOUT ? ", timeout" : "");
filtered = i8042_filter(data, str, serio);
spin_unlock_irqrestore(&i8042_lock, flags);
if (likely(port->exists && !filtered))
serio_interrupt(serio, data, dfl);
out:
return IRQ_RETVAL(ret);
}
/*
* i8042_enable_kbd_port enables keyboard 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;
pr_err("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;
pr_err("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(¶m, I8042_CMD_MUX_PFX + i);
i8042_command(¶m, 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 (true)
* or Legacy (false) mode.
*/
static int i8042_set_mux_mode(bool multiplex, unsigned char *mux_version)
{
unsigned char param, val;
/*
* 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 = val = 0xf0;
if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param != val)
return -1;
param = val = multiplex ? 0x56 : 0xf6;
if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param != val)
return -1;
param = val = multiplex ? 0xa4 : 0xa5;
if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param == val)
return -1;
/*
* Workaround for interference with USB Legacy emulation
* that causes a v10.12 MUX to be found.
*/
if (param == 0xac)
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 __init i8042_check_mux(void)
{
unsigned char mux_version;
if (i8042_set_mux_mode(true, &mux_version))
return -1;
pr_info("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)) {
pr_err("Failed to disable AUX port, can't use MUX\n");
return -EIO;
}
i8042_mux_present = true;
return 0;
}
/*
* The following is used to test AUX IRQ delivery.
*/
static struct completion i8042_aux_irq_delivered __initdata;
static bool i8042_irq_being_tested __initdata;
static irqreturn_t __init 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();
dbg("%02x <- i8042 (aux_test_irq, %s)\n",
data, str & I8042_STR_AUXDATA ? "aux" : "kbd");
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 __init i8042_toggle_aux(bool on)
{
unsigned char param;
int i;
if (i8042_command(¶m,
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(¶m, 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 __init i8042_check_aux(void)
{
int retval = -1;
bool irq_registered = false;
bool aux_loop_broken = false;
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(¶m, 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(¶m, 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 = true;
}
/*
* Bit assignment test - filters out PS/2 i8042's in AT mode
*/
if (i8042_toggle_aux(false)) {
pr_warn("Failed to disable AUX port, but continuing anyway... Is this a SiS?\n");
pr_warn("If AUX port is really absent please use the 'i8042.noaux' option\n");
}
if (i8042_toggle_aux(true))
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 || i8042_bypass_aux_irq_test || 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 = true;
if (i8042_enable_aux_port())
goto out;
spin_lock_irqsave(&i8042_lock, flags);
init_completion(&i8042_aux_irq_delivered);
i8042_irq_being_tested = true;
param = 0xa5;
retval = __i8042_command(¶m, 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.
*/
dbg(" -- i8042 (aux irq test timeout)\n");
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) {
pr_err("No controller found\n");
return -ENODEV;
}
return 0;
}
static int i8042_controller_selftest(void)
{
unsigned char param;
int i = 0;
/*
* We try this 5 times; on some really fragile systems this does not
* take the first time...
*/
do {
if (i8042_command(¶m, I8042_CMD_CTL_TEST)) {
pr_err("i8042 controller selftest timeout\n");
return -ENODEV;
}
if (param == I8042_RET_CTL_TEST)
return 0;
dbg("i8042 controller selftest: %#x != %#x\n",
param, I8042_RET_CTL_TEST);
msleep(50);
} while (i++ < 5);
#ifdef CONFIG_X86
/*
* On x86, we don't fail entire i8042 initialization if controller
* reset fails in hopes that keyboard port will still be functional
* and user will still get a working keyboard. This is especially
* important on netbooks. On other arches we trust hardware more.
*/
pr_info("giving up on controller selftest, continuing anyway...\n");
return 0;
#else
pr_err("i8042 controller selftest failed\n");
return -EIO;
#endif
}
/*
* 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;
int n = 0;
unsigned char ctr[2];
/*
* Save the CTR for restore on unload / reboot.
*/
do {
if (n >= 10) {
pr_err("Unable to get stable CTR read\n");
return -EIO;
}
if (n != 0)
udelay(50);
if (i8042_command(&ctr[n++ % 2], I8042_CMD_CTL_RCTR)) {
pr_err("Can't read CTR while initializing i8042\n");
return -EIO;
}
} while (n < 2 || ctr[0] != ctr[1]);
i8042_initial_ctr = i8042_ctr = ctr[0];
/*
* 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
pr_warn("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 = true;
/*
* 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)) {
pr_err("Can't write CTR while initializing i8042\n");
return -EIO;
}
/*
* Flush whatever accumulated while we were disabling keyboard port.
*/
i8042_flush();
return 0;
}
/*
* Reset the controller and reset CRT to the original value set by BIOS.
*/
static void i8042_controller_reset(bool force_reset)
{
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);
if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
pr_warn("Can't write CTR while resetting\n");
/*
* Disable MUX mode if present.
*/
if (i8042_mux_present)
i8042_set_mux_mode(false, NULL);
/*
* Reset the controller if requested.
*/
if (i8042_reset || force_reset)
i8042_controller_selftest();
/*
* Restore the original control register setting.
*/
if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
pr_warn("Can't restore CTR\n");
}
/*
* i8042_panic_blink() will turn the keyboard LEDs on or off 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(int state)
{
long delay = 0;
char led;
led = (state) ? 0x01 | 0x04 : 0;
while (i8042_read_status() & I8042_STR_IBF)
DELAY;
dbg("%02x -> i8042 (panic blink)\n", 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)\n", led);
i8042_write_data(led);
DELAY;
return delay;
}
#undef DELAY
#ifdef CONFIG_X86
static void i8042_dritek_enable(void)
{
unsigned char param = 0x90;
int error;
error = i8042_command(¶m, 0x1059);
if (error)
pr_warn("Failed to enable DRITEK extension: %d\n", error);
}
#endif
#ifdef CONFIG_PM
/*
* Here we try to reset everything back to a state we had
* before suspending.
*/
static int i8042_controller_resume(bool force_reset)
{
int error;
error = i8042_controller_check();
if (error)
return error;
if (i8042_reset || force_reset) {
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)) {
pr_warn("Can't write CTR to resume, retrying...\n");
msleep(50);
if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
pr_err("CTR write retry failed\n");
return -EIO;
}
}
#ifdef CONFIG_X86
if (i8042_dritek)
i8042_dritek_enable();
#endif
if (i8042_mux_present) {
if (i8042_set_mux_mode(true, NULL) || i8042_enable_mux_ports())
pr_warn("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);
return 0;
}
/*
* Here we try to restore the original BIOS settings to avoid
* upsetting it.
*/
static int i8042_pm_suspend(struct device *dev)
{
i8042_controller_reset(true);
return 0;
}
static int i8042_pm_resume(struct device *dev)
{
/*
* On resume from S2R we always try to reset the controller
* to bring it in a sane state. (In case of S2D we expect
* BIOS to reset the controller for us.)
*/
return i8042_controller_resume(true);
}
static int i8042_pm_thaw(struct device *dev)
{
i8042_interrupt(0, NULL);
return 0;
}
static int i8042_pm_reset(struct device *dev)
{
i8042_controller_reset(false);
return 0;
}
static int i8042_pm_restore(struct device *dev)
{
return i8042_controller_resume(false);
}
static const struct dev_pm_ops i8042_pm_ops = {
.suspend = i8042_pm_suspend,
.resume = i8042_pm_resume,
.thaw = i8042_pm_thaw,
.poweroff = i8042_pm_reset,
.restore = i8042_pm_restore,
};
#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(false);
}
static int __init 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->close = i8042_port_close;
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 __init 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));
serio->close = i8042_port_close;
} 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 __init i8042_free_kbd_port(void)
{
kfree(i8042_ports[I8042_KBD_PORT_NO].serio);
i8042_ports[I8042_KBD_PORT_NO].serio = NULL;
}
static void __init 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 __init 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 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;
}
}
}
/*
* Checks whether port belongs to i8042 controller.
*/
bool i8042_check_port_owner(const struct serio *port)
{
int i;
for (i = 0; i < I8042_NUM_PORTS; i++)
if (i8042_ports[i].serio == port)
return true;
return false;
}
EXPORT_SYMBOL(i8042_check_port_owner);
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 = false;
}
static int __init 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 = true;
return 0;
err_free_irq:
free_irq(I8042_AUX_IRQ, i8042_platform_device);
err_free_ports:
i8042_free_aux_ports();
return error;
}
static int __init 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 = true;
return 0;
err_free_irq:
free_irq(I8042_KBD_IRQ, i8042_platform_device);
err_free_port:
i8042_free_kbd_port();
return error;
}
static int __init i8042_probe(struct platform_device *dev)
{
int error;
i8042_platform_device = dev;
if (i8042_reset) {
error = i8042_controller_selftest();
if (error)
return error;
}
error = i8042_controller_init();
if (error)
return error;
#ifdef CONFIG_X86
if (i8042_dritek)
i8042_dritek_enable();
#endif
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(false);
i8042_platform_device = NULL;
return error;
}
static int i8042_remove(struct platform_device *dev)
{
i8042_unregister_ports();
i8042_free_irqs();
i8042_controller_reset(false);
i8042_platform_device = NULL;
return 0;
}
static struct platform_driver i8042_driver = {
.driver = {
.name = "i8042",
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &i8042_pm_ops,
#endif
},
.remove = i8042_remove,
.shutdown = i8042_shutdown,
};
static int __init i8042_init(void)
{
struct platform_device *pdev;
int err;
dbg_init();
err = i8042_platform_init();
if (err)
return err;
err = i8042_controller_check();
if (err)
goto err_platform_exit;
pdev = platform_create_bundle(&i8042_driver, i8042_probe, NULL, 0, NULL, 0);
if (IS_ERR(pdev)) {
err = PTR_ERR(pdev);
goto err_platform_exit;
}
panic_blink = i8042_panic_blink;
return 0;
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);