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/*
* ec.c - Embedded controller support
*
* Copyright (C) 2000 Andrew Henroid
*
* 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 of the License, 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/pm.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <asm/io.h>
#include "acpi.h"
#include "driver.h"
#define _COMPONENT OS_DEPENDENT
MODULE_NAME ("ec")
#define ACPI_EC_HID "PNP0A09"
enum
{
ACPI_EC_SMI = 0x40,
ACPI_EC_SCI = 0x20,
ACPI_EC_BURST = 0x10,
ACPI_EC_CMD = 0x08,
ACPI_EC_IBF = 0x02,
ACPI_EC_OBF = 0x01
};
enum
{
ACPI_EC_READ = 0x80,
ACPI_EC_WRITE = 0x81,
ACPI_EC_BURST_ENABLE = 0x82,
ACPI_EC_BURST_DISABLE = 0x83,
ACPI_EC_QUERY = 0x84,
};
static int acpi_ec_data = 0;
static int acpi_ec_status = 0;
static DECLARE_WAIT_QUEUE_HEAD(acpi_ec_wait);
/*
* handle GPE
*/
static void
acpi_ec_gpe(void *context)
{
printk(KERN_INFO "ACPI: EC GPE\n");
if (waitqueue_active(&acpi_ec_wait))
wake_up_interruptible(&acpi_ec_wait);
}
/*
* wait for read/write status to clear
*/
static void
acpi_ec_wait_control(void)
{
udelay(1);
while(inb(acpi_ec_status) & ACPI_EC_IBF)
udelay(10);
}
/*
* read a byte from the EC
*/
int
acpi_ec_read(int addr, int *value)
{
if (!acpi_ec_data || !acpi_ec_status)
return -1;
outb(ACPI_EC_READ, acpi_ec_status);
acpi_ec_wait_control();
outb(addr, acpi_ec_data);
acpi_ec_wait_control();
interruptible_sleep_on(&acpi_ec_wait);
*value = inb(acpi_ec_data);
return 0;
}
/*
* write a byte to the EC
*/
int
acpi_ec_write(int addr, int value)
{
if (!acpi_ec_data || !acpi_ec_status)
return -1;
outb(ACPI_EC_WRITE, acpi_ec_status);
acpi_ec_wait_control();
outb(addr, acpi_ec_data);
acpi_ec_wait_control();
outb(value, acpi_ec_data);
acpi_ec_wait_control();
interruptible_sleep_on(&acpi_ec_wait);
return 0;
}
/*
* Get Embedded Controller information
*/
static ACPI_STATUS
acpi_find_ec(ACPI_HANDLE handle, u32 level, void *ctx, void **value)
{
ACPI_DEVICE_INFO dev_info;
ACPI_OBJECT obj;
ACPI_BUFFER buf;
RESOURCE *res;
int gpe;
if (!ACPI_SUCCESS(acpi_get_object_info(handle, &dev_info))
|| !(dev_info.valid & ACPI_VALID_HID)
|| 0 != STRCMP(dev_info.hardware_id, ACPI_EC_HID))
return AE_OK;
buf.length = 0;
buf.pointer = NULL;
if (acpi_get_current_resources(handle, &buf) != AE_BUFFER_OVERFLOW)
return AE_OK;
buf.pointer = kmalloc(buf.length, GFP_KERNEL);
if (!buf.pointer)
return AE_OK;
if (!ACPI_SUCCESS(acpi_get_current_resources(handle, &buf))) {
kfree(buf.pointer);
return AE_OK;
}
res = (RESOURCE*) buf.pointer;
acpi_ec_data = (int) res->data.io.min_base_address;
res = (RESOURCE*)((u8*) buf.pointer + res->length);
acpi_ec_status = (int) res->data.io.min_base_address;
kfree(buf.pointer);
buf.length = sizeof(obj);
buf.pointer = &obj;
if (!ACPI_SUCCESS(acpi_evaluate_object(handle, "_GPE", NULL, &buf))
|| obj.type != ACPI_TYPE_NUMBER)
return AE_OK;
gpe = (int) obj.number.value;
printk(KERN_INFO "ACPI: found EC @ (0x%02x,0x%02x,%d)\n",
acpi_ec_data, acpi_ec_status, gpe);
if (!ACPI_SUCCESS(acpi_install_gpe_handler(
gpe,
(ACPI_EVENT_LEVEL_TRIGGERED
| ACPI_EVENT_EDGE_TRIGGERED),
acpi_ec_gpe,
NULL))) {
DEBUG_PRINT(ACPI_ERROR, ("Could not install GPE handler for EC.\n"));
return AE_OK;
}
return AE_OK;
}
int
acpi_ec_init(void)
{
acpi_walk_namespace(ACPI_TYPE_DEVICE,
ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
acpi_find_ec,
NULL,
NULL);
return 0;
}
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