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/*
* power.c - Overall power driver. Also handles AC adapter device.
*
* Copyright (C) 2000 Andrew Grover
*
* 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/proc_fs.h>
#include "acpi.h"
#include "driver.h"
#define _COMPONENT OS_DEPENDENT
MODULE_NAME ("power")
int acpi_cmbatt_init(void);
int acpi_cmbatt_terminate(void);
/* ACPI-specific defines */
#define ACPI_AC_ADAPTER_HID "ACPI0003"
static int ac_count = 0;
static ACPI_HANDLE ac_handle = 0;
/*
* We found a device with the correct HID
*/
static ACPI_STATUS
acpi_found_ac_adapter(ACPI_HANDLE handle, u32 level, void *ctx, void **value)
{
ACPI_DEVICE_INFO info;
if (ac_count > 0) {
printk(KERN_ERR "AC Adapter: more than one!\n");
return (AE_OK);
}
if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info))) {
printk(KERN_ERR "AC Adapter: Could not get AC Adapter object info\n");
return (AE_OK);
}
if (!(info.valid & ACPI_VALID_STA)) {
printk(KERN_ERR "AC Adapter: Battery _STA invalid\n");
return AE_OK;
}
printk(KERN_INFO "AC Adapter: found\n");
ac_handle = handle;
ac_count++;
return AE_OK;
}
static int
proc_read_ac_adapter_status(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
ACPI_OBJECT obj;
ACPI_BUFFER buf;
char *p = page;
int len;
buf.length = sizeof(obj);
buf.pointer = &obj;
if (!ACPI_SUCCESS(acpi_evaluate_object(ac_handle, "_PSR", NULL, &buf))
|| obj.type != ACPI_TYPE_INTEGER) {
p += sprintf(p, "Could not read AC status\n");
goto end;
}
if (obj.integer.value)
p += sprintf(p, "on-line\n");
else
p += sprintf(p, "off-line\n");
end:
len = (p - page);
if (len <= off+count) *eof = 1;
*start = page + off;
len -= off;
if (len>count) len = count;
if (len<0) len = 0;
return len;
}
int
acpi_power_init(void)
{
acpi_get_devices(ACPI_AC_ADAPTER_HID,
acpi_found_ac_adapter,
NULL,
NULL);
if (!proc_mkdir("power", NULL))
return 0;
if (ac_handle) {
create_proc_read_entry("power/ac", 0, NULL,
proc_read_ac_adapter_status, NULL);
}
acpi_cmbatt_init();
return 0;
}
int
acpi_power_terminate(void)
{
acpi_cmbatt_terminate();
if (ac_handle) {
remove_proc_entry("power/ac", NULL);
}
remove_proc_entry("power", NULL);
return 0;
}
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