WebSVN - shark - Rev 523 - /shark/trunk/drivers/input/serio/i8042.c

/*
* 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);

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(root)/shark/trunk/drivers/input/serio/i8042.c @ 1689 - Rev 523