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/*
* kbc.c -- low level functions to access Keyboard Controller
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* Written by Soós Péter <sp@osb.hu>, 2002-2004
* Modified by Mathieu Bérard <mathieu.berard@crans.org>, 2006
*/
#include "omnibook.h"
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include "hardware.h"
extern int omnibook_key_polling_enable(void);
extern int omnibook_key_polling_disable(void);
/*
* Registers of the keyboard controller
*/
#define OMNIBOOK_KBC_DATA 0x60
#define OMNIBOOK_KBC_SC 0x64
/*
* Keyboard controller status register bits
*/
#define OMNIBOOK_KBC_STAT_OBF 0x01 /* Output buffer full */
#define OMNIBOOK_KBC_STAT_IBF 0x02 /* Input buffer full */
/*
* Interrupt control
*/
static DEFINE_SPINLOCK(omnibook_kbc_lock);
/*
* Wait for keyboard buffer
*/
static int omnibook_kbc_wait(u8 event)
{
int timeout = OMNIBOOK_TIMEOUT;
switch (event) {
case OMNIBOOK_KBC_STAT_OBF:
while (!(inb(OMNIBOOK_KBC_SC) & event) && timeout--)
mdelay(1);
break;
case OMNIBOOK_KBC_STAT_IBF:
while ((inb(OMNIBOOK_KBC_SC) & event) && timeout--)
mdelay(1);
break;
default:
return -EINVAL;
}
if (timeout > 0)
return 0;
return -ETIME;
}
/*
* Write to the keyboard command register
*/
static int omnibook_kbc_write_command(u8 cmd)
{
int retval;
spin_lock_irq(&omnibook_kbc_lock);
retval = omnibook_kbc_wait(OMNIBOOK_KBC_STAT_IBF);
if (retval)
goto end;
outb(cmd, OMNIBOOK_KBC_SC);
retval = omnibook_kbc_wait(OMNIBOOK_KBC_STAT_IBF);
end:
spin_unlock_irq(&omnibook_kbc_lock);
return retval;
}
/*
* Write to the keyboard data register
*/
static int omnibook_kbc_write_data(u8 data)
{
int retval;
spin_lock_irq(&omnibook_kbc_lock);
retval = omnibook_kbc_wait(OMNIBOOK_KBC_STAT_IBF);
if (retval)
goto end;
outb(data, OMNIBOOK_KBC_DATA);
retval = omnibook_kbc_wait(OMNIBOOK_KBC_STAT_IBF);
end:
spin_unlock_irq(&omnibook_kbc_lock);
return retval;
}
/*
* Send a command to keyboard controller
*/
static int omnibook_kbc_command(const struct omnibook_operation *io_op, u8 data)
{
int retval;
if ((retval = omnibook_kbc_write_command(OMNIBOOK_KBC_CONTROL_CMD)))
return retval;
retval = omnibook_kbc_write_data(data);
return retval;
}
/*
* Onetouch button hotkey handler
*/
static int omnibook_kbc_hotkeys(const struct omnibook_operation *io_op, unsigned int state)
{
int retval;
retval = __omnibook_toggle(io_op, !!(state & HKEY_ONETOUCH));
return retval;
}
/*
* Backend interface declarations
*/
struct omnibook_backend kbc_backend = {
.name = "i8042",
.hotkeys_write_cap = HKEY_ONETOUCH,
.byte_write = omnibook_kbc_command,
.hotkeys_set = omnibook_kbc_hotkeys,
};
/* End of file */
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