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/*
* ec.c -- low level functions to access Embedded 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"
/*
* Interrupt control
*/
static DEFINE_SPINLOCK(omnibook_ec_lock);
/*
* Registers of the embedded controller
*/
#define OMNIBOOK_EC_DATA 0x62
#define OMNIBOOK_EC_SC 0x66
/*
* Embedded controller status register bits
*/
#define OMNIBOOK_EC_STAT_OBF 0x01 /* Output buffer full */
#define OMNIBOOK_EC_STAT_IBF 0x02 /* Input buffer full */
/*
* Embedded controller commands
*/
#define OMNIBOOK_EC_CMD_READ 0x80
#define OMNIBOOK_EC_CMD_WRITE 0x81
/*
* Wait for embedded controller buffer
*/
static int omnibook_ec_wait(u8 event)
{
int timeout = OMNIBOOK_TIMEOUT;
switch (event) {
case OMNIBOOK_EC_STAT_OBF:
while (!(inb(OMNIBOOK_EC_SC) & event) && timeout--)
mdelay(1);
break;
case OMNIBOOK_EC_STAT_IBF:
while ((inb(OMNIBOOK_EC_SC) & event) && timeout--)
mdelay(1);
break;
default:
return -EINVAL;
}
if (timeout > 0)
return 0;
return -ETIME;
}
/*
* Read from the embedded controller
* Decide at run-time if we can use the much cleaner ACPI EC driver instead of
* this implementation, this is the case if ACPI has been compiled and is not
* disabled.
*/
static int omnibook_ec_read(const struct omnibook_operation *io_op, u8 * data)
{
int retval;
#ifdef CONFIG_ACPI_EC
if (likely(!acpi_disabled)) {
retval = ec_read((u8) io_op->read_addr, data);
if (io_op->read_mask)
*data &= io_op->read_mask;
// dprintk("ACPI EC read at %lx success %i.\n", io_op->read_addr, retval);
return retval;
}
#endif
spin_lock_irq(&omnibook_ec_lock);
retval = omnibook_ec_wait(OMNIBOOK_EC_STAT_IBF);
if (retval)
goto end;
outb(OMNIBOOK_EC_CMD_READ, OMNIBOOK_EC_SC);
retval = omnibook_ec_wait(OMNIBOOK_EC_STAT_IBF);
if (retval)
goto end;
outb((u8) io_op->read_addr, OMNIBOOK_EC_DATA);
retval = omnibook_ec_wait(OMNIBOOK_EC_STAT_OBF);
if (retval)
goto end;
*data = inb(OMNIBOOK_EC_DATA);
if (io_op->read_mask)
*data &= io_op->read_mask;
end:
spin_unlock_irq(&omnibook_ec_lock);
// dprintk("Custom EC read at %lx success %i.\n", io_op->read_addr, retval);
return retval;
}
/*
* Write to the embedded controller:
* If OMNIBOOK_LEGACY is set, decide at run-time if we can use the much cleaner
* ACPI EC driver instead of this legacy implementation.
* This is the case if ACPI has been compiled and is not
* disabled.
* If OMNIBOOK_LEGACY is unset, we drop our custoim implementation
*/
static int omnibook_ec_write(const struct omnibook_operation *io_op, u8 data)
{
int retval;
#ifdef CONFIG_ACPI_EC
if (likely(!acpi_disabled)) {
retval = ec_write((u8) io_op->write_addr, data);
// dprintk("ACPI EC write at %lx success %i.\n", io_op->write_addr, retval);
return retval;
}
#endif
spin_lock_irq(&omnibook_ec_lock);
retval = omnibook_ec_wait(OMNIBOOK_EC_STAT_IBF);
if (retval)
goto end;
outb(OMNIBOOK_EC_CMD_WRITE, OMNIBOOK_EC_SC);
retval = omnibook_ec_wait(OMNIBOOK_EC_STAT_IBF);
if (retval)
goto end;
outb((u8) io_op->write_addr, OMNIBOOK_EC_DATA);
retval = omnibook_ec_wait(OMNIBOOK_EC_STAT_IBF);
if (retval)
goto end;
outb(data, OMNIBOOK_EC_DATA);
end:
spin_unlock_irq(&omnibook_ec_lock);
// dprintk("Custom EC write at %lx success %i.\n", io_op->write_addr, retval);
return retval;
}
static int omnibook_ec_display(const struct omnibook_operation *io_op, unsigned int *state)
{
int retval;
u8 raw_state;
retval = __backend_byte_read(io_op, &raw_state);
if (retval < 0)
return retval;
*state = !!(raw_state) & DISPLAY_CRT_DET;
return DISPLAY_CRT_DET;
}
/*
* Backend interface declarations
*/
struct omnibook_backend ec_backend = {
.name = "ec",
.byte_read = omnibook_ec_read,
.byte_write = omnibook_ec_write,
.display_get = omnibook_ec_display,
};
/* End of file */
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