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OpenCloudOS-Kernel/drivers/acpi/battery.c

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/*
* acpi_battery.c - ACPI Battery Driver ($Revision: 37 $)
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
#define ACPI_BATTERY_FORMAT_BIF "NNNNNNNNNSSSS"
#define ACPI_BATTERY_FORMAT_BST "NNNN"
#define ACPI_BATTERY_COMPONENT 0x00040000
#define ACPI_BATTERY_CLASS "battery"
#define ACPI_BATTERY_HID "PNP0C0A"
#define ACPI_BATTERY_DRIVER_NAME "ACPI Battery Driver"
#define ACPI_BATTERY_DEVICE_NAME "Battery"
#define ACPI_BATTERY_FILE_INFO "info"
#define ACPI_BATTERY_FILE_STATUS "state"
#define ACPI_BATTERY_FILE_ALARM "alarm"
#define ACPI_BATTERY_NOTIFY_STATUS 0x80
#define ACPI_BATTERY_NOTIFY_INFO 0x81
#define ACPI_BATTERY_UNITS_WATTS "mW"
#define ACPI_BATTERY_UNITS_AMPS "mA"
#define _COMPONENT ACPI_BATTERY_COMPONENT
ACPI_MODULE_NAME("acpi_battery")
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION(ACPI_BATTERY_DRIVER_NAME);
MODULE_LICENSE("GPL");
static int acpi_battery_add(struct acpi_device *device);
static int acpi_battery_remove(struct acpi_device *device, int type);
static struct acpi_driver acpi_battery_driver = {
.name = ACPI_BATTERY_DRIVER_NAME,
.class = ACPI_BATTERY_CLASS,
.ids = ACPI_BATTERY_HID,
.ops = {
.add = acpi_battery_add,
.remove = acpi_battery_remove,
},
};
struct acpi_battery_status {
acpi_integer state;
acpi_integer present_rate;
acpi_integer remaining_capacity;
acpi_integer present_voltage;
};
struct acpi_battery_info {
acpi_integer power_unit;
acpi_integer design_capacity;
acpi_integer last_full_capacity;
acpi_integer battery_technology;
acpi_integer design_voltage;
acpi_integer design_capacity_warning;
acpi_integer design_capacity_low;
acpi_integer battery_capacity_granularity_1;
acpi_integer battery_capacity_granularity_2;
acpi_string model_number;
acpi_string serial_number;
acpi_string battery_type;
acpi_string oem_info;
};
struct acpi_battery_flags {
u8 present:1; /* Bay occupied? */
u8 power_unit:1; /* 0=watts, 1=apms */
u8 alarm:1; /* _BTP present? */
u8 reserved:5;
};
struct acpi_battery_trips {
unsigned long warning;
unsigned long low;
};
struct acpi_battery {
acpi_handle handle;
struct acpi_battery_flags flags;
struct acpi_battery_trips trips;
unsigned long alarm;
struct acpi_battery_info *info;
};
/* --------------------------------------------------------------------------
Battery Management
-------------------------------------------------------------------------- */
static int
acpi_battery_get_info(struct acpi_battery *battery,
struct acpi_battery_info **bif)
{
int result = 0;
acpi_status status = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BIF),
ACPI_BATTERY_FORMAT_BIF
};
struct acpi_buffer data = { 0, NULL };
union acpi_object *package = NULL;
ACPI_FUNCTION_TRACE("acpi_battery_get_info");
if (!battery || !bif)
return_VALUE(-EINVAL);
/* Evalute _BIF */
status = acpi_evaluate_object(battery->handle, "_BIF", NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BIF\n"));
return_VALUE(-ENODEV);
}
package = (union acpi_object *)buffer.pointer;
/* Extract Package Data */
status = acpi_extract_package(package, &format, &data);
if (status != AE_BUFFER_OVERFLOW) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BIF\n"));
result = -ENODEV;
goto end;
}
data.pointer = kmalloc(data.length, GFP_KERNEL);
if (!data.pointer) {
result = -ENOMEM;
goto end;
}
memset(data.pointer, 0, data.length);
status = acpi_extract_package(package, &format, &data);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BIF\n"));
kfree(data.pointer);
result = -ENODEV;
goto end;
}
end:
acpi_os_free(buffer.pointer);
if (!result)
(*bif) = (struct acpi_battery_info *)data.pointer;
return_VALUE(result);
}
static int
acpi_battery_get_status(struct acpi_battery *battery,
struct acpi_battery_status **bst)
{
int result = 0;
acpi_status status = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BST),
ACPI_BATTERY_FORMAT_BST
};
struct acpi_buffer data = { 0, NULL };
union acpi_object *package = NULL;
ACPI_FUNCTION_TRACE("acpi_battery_get_status");
if (!battery || !bst)
return_VALUE(-EINVAL);
/* Evalute _BST */
status = acpi_evaluate_object(battery->handle, "_BST", NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BST\n"));
return_VALUE(-ENODEV);
}
package = (union acpi_object *)buffer.pointer;
/* Extract Package Data */
status = acpi_extract_package(package, &format, &data);
if (status != AE_BUFFER_OVERFLOW) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BST\n"));
result = -ENODEV;
goto end;
}
data.pointer = kmalloc(data.length, GFP_KERNEL);
if (!data.pointer) {
result = -ENOMEM;
goto end;
}
memset(data.pointer, 0, data.length);
status = acpi_extract_package(package, &format, &data);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BST\n"));
kfree(data.pointer);
result = -ENODEV;
goto end;
}
end:
acpi_os_free(buffer.pointer);
if (!result)
(*bst) = (struct acpi_battery_status *)data.pointer;
return_VALUE(result);
}
static int
acpi_battery_set_alarm(struct acpi_battery *battery, unsigned long alarm)
{
acpi_status status = 0;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list arg_list = { 1, &arg0 };
ACPI_FUNCTION_TRACE("acpi_battery_set_alarm");
if (!battery)
return_VALUE(-EINVAL);
if (!battery->flags.alarm)
return_VALUE(-ENODEV);
arg0.integer.value = alarm;
status = acpi_evaluate_object(battery->handle, "_BTP", &arg_list, NULL);
if (ACPI_FAILURE(status))
return_VALUE(-ENODEV);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", (u32) alarm));
battery->alarm = alarm;
return_VALUE(0);
}
static int acpi_battery_check(struct acpi_battery *battery)
{
int result = 0;
acpi_status status = AE_OK;
acpi_handle handle = NULL;
struct acpi_device *device = NULL;
struct acpi_battery_info *bif = NULL;
ACPI_FUNCTION_TRACE("acpi_battery_check");
if (!battery)
return_VALUE(-EINVAL);
result = acpi_bus_get_device(battery->handle, &device);
if (result)
return_VALUE(result);
result = acpi_bus_get_status(device);
if (result)
return_VALUE(result);
/* Insertion? */
if (!battery->flags.present && device->status.battery_present) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery inserted\n"));
/* Evalute _BIF to get certain static information */
result = acpi_battery_get_info(battery, &bif);
if (result)
return_VALUE(result);
battery->flags.power_unit = bif->power_unit;
battery->trips.warning = bif->design_capacity_warning;
battery->trips.low = bif->design_capacity_low;
kfree(bif);
/* See if alarms are supported, and if so, set default */
status = acpi_get_handle(battery->handle, "_BTP", &handle);
if (ACPI_SUCCESS(status)) {
battery->flags.alarm = 1;
acpi_battery_set_alarm(battery, battery->trips.warning);
}
}
/* Removal? */
else if (battery->flags.present && !device->status.battery_present) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery removed\n"));
}
battery->flags.present = device->status.battery_present;
return_VALUE(result);
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
static struct proc_dir_entry *acpi_battery_dir;
static int acpi_battery_read_info(struct seq_file *seq, void *offset)
{
int result = 0;
struct acpi_battery *battery = (struct acpi_battery *)seq->private;
struct acpi_battery_info *bif = NULL;
char *units = "?";
ACPI_FUNCTION_TRACE("acpi_battery_read_info");
if (!battery)
goto end;
if (battery->flags.present)
seq_printf(seq, "present: yes\n");
else {
seq_printf(seq, "present: no\n");
goto end;
}
/* Battery Info (_BIF) */
result = acpi_battery_get_info(battery, &bif);
if (result || !bif) {
seq_printf(seq, "ERROR: Unable to read battery information\n");
goto end;
}
units =
bif->
power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
if (bif->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "design capacity: unknown\n");
else
seq_printf(seq, "design capacity: %d %sh\n",
(u32) bif->design_capacity, units);
if (bif->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "last full capacity: unknown\n");
else
seq_printf(seq, "last full capacity: %d %sh\n",
(u32) bif->last_full_capacity, units);
switch ((u32) bif->battery_technology) {
case 0:
seq_printf(seq, "battery technology: non-rechargeable\n");
break;
case 1:
seq_printf(seq, "battery technology: rechargeable\n");
break;
default:
seq_printf(seq, "battery technology: unknown\n");
break;
}
if (bif->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "design voltage: unknown\n");
else
seq_printf(seq, "design voltage: %d mV\n",
(u32) bif->design_voltage);
seq_printf(seq, "design capacity warning: %d %sh\n",
(u32) bif->design_capacity_warning, units);
seq_printf(seq, "design capacity low: %d %sh\n",
(u32) bif->design_capacity_low, units);
seq_printf(seq, "capacity granularity 1: %d %sh\n",
(u32) bif->battery_capacity_granularity_1, units);
seq_printf(seq, "capacity granularity 2: %d %sh\n",
(u32) bif->battery_capacity_granularity_2, units);
seq_printf(seq, "model number: %s\n", bif->model_number);
seq_printf(seq, "serial number: %s\n", bif->serial_number);
seq_printf(seq, "battery type: %s\n", bif->battery_type);
seq_printf(seq, "OEM info: %s\n", bif->oem_info);
end:
kfree(bif);
return_VALUE(0);
}
static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_battery_read_info, PDE(inode)->data);
}
static int acpi_battery_read_state(struct seq_file *seq, void *offset)
{
int result = 0;
struct acpi_battery *battery = (struct acpi_battery *)seq->private;
struct acpi_battery_status *bst = NULL;
char *units = "?";
ACPI_FUNCTION_TRACE("acpi_battery_read_state");
if (!battery)
goto end;
if (battery->flags.present)
seq_printf(seq, "present: yes\n");
else {
seq_printf(seq, "present: no\n");
goto end;
}
/* Battery Units */
units =
battery->flags.
power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
/* Battery Status (_BST) */
result = acpi_battery_get_status(battery, &bst);
if (result || !bst) {
seq_printf(seq, "ERROR: Unable to read battery status\n");
goto end;
}
if (!(bst->state & 0x04))
seq_printf(seq, "capacity state: ok\n");
else
seq_printf(seq, "capacity state: critical\n");
if ((bst->state & 0x01) && (bst->state & 0x02)) {
seq_printf(seq,
"charging state: charging/discharging\n");
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Battery Charging and Discharging?\n"));
} else if (bst->state & 0x01)
seq_printf(seq, "charging state: discharging\n");
else if (bst->state & 0x02)
seq_printf(seq, "charging state: charging\n");
else {
seq_printf(seq, "charging state: charged\n");
}
if (bst->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "present rate: unknown\n");
else
seq_printf(seq, "present rate: %d %s\n",
(u32) bst->present_rate, units);
if (bst->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "remaining capacity: unknown\n");
else
seq_printf(seq, "remaining capacity: %d %sh\n",
(u32) bst->remaining_capacity, units);
if (bst->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "present voltage: unknown\n");
else
seq_printf(seq, "present voltage: %d mV\n",
(u32) bst->present_voltage);
end:
kfree(bst);
return_VALUE(0);
}
static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_battery_read_state, PDE(inode)->data);
}
static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
{
struct acpi_battery *battery = (struct acpi_battery *)seq->private;
char *units = "?";
ACPI_FUNCTION_TRACE("acpi_battery_read_alarm");
if (!battery)
goto end;
if (!battery->flags.present) {
seq_printf(seq, "present: no\n");
goto end;
}
/* Battery Units */
units =
battery->flags.
power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
/* Battery Alarm */
seq_printf(seq, "alarm: ");
if (!battery->alarm)
seq_printf(seq, "unsupported\n");
else
seq_printf(seq, "%d %sh\n", (u32) battery->alarm, units);
end:
return_VALUE(0);
}
static ssize_t
acpi_battery_write_alarm(struct file *file,
const char __user * buffer,
size_t count, loff_t * ppos)
{
int result = 0;
char alarm_string[12] = { '\0' };
struct seq_file *m = (struct seq_file *)file->private_data;
struct acpi_battery *battery = (struct acpi_battery *)m->private;
ACPI_FUNCTION_TRACE("acpi_battery_write_alarm");
if (!battery || (count > sizeof(alarm_string) - 1))
return_VALUE(-EINVAL);
if (!battery->flags.present)
return_VALUE(-ENODEV);
if (copy_from_user(alarm_string, buffer, count))
return_VALUE(-EFAULT);
alarm_string[count] = '\0';
result = acpi_battery_set_alarm(battery,
simple_strtoul(alarm_string, NULL, 0));
if (result)
return_VALUE(result);
return_VALUE(count);
}
static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
}
static struct file_operations acpi_battery_info_ops = {
.open = acpi_battery_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static struct file_operations acpi_battery_state_ops = {
.open = acpi_battery_state_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static struct file_operations acpi_battery_alarm_ops = {
.open = acpi_battery_alarm_open_fs,
.read = seq_read,
.write = acpi_battery_write_alarm,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static int acpi_battery_add_fs(struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
ACPI_FUNCTION_TRACE("acpi_battery_add_fs");
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
acpi_battery_dir);
if (!acpi_device_dir(device))
return_VALUE(-ENODEV);
acpi_device_dir(device)->owner = THIS_MODULE;
}
/* 'info' [R] */
entry = create_proc_entry(ACPI_BATTERY_FILE_INFO,
S_IRUGO, acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
ACPI_BATTERY_FILE_INFO));
else {
entry->proc_fops = &acpi_battery_info_ops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'status' [R] */
entry = create_proc_entry(ACPI_BATTERY_FILE_STATUS,
S_IRUGO, acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
ACPI_BATTERY_FILE_STATUS));
else {
entry->proc_fops = &acpi_battery_state_ops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'alarm' [R/W] */
entry = create_proc_entry(ACPI_BATTERY_FILE_ALARM,
S_IFREG | S_IRUGO | S_IWUSR,
acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
ACPI_BATTERY_FILE_ALARM));
else {
entry->proc_fops = &acpi_battery_alarm_ops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
return_VALUE(0);
}
static int acpi_battery_remove_fs(struct acpi_device *device)
{
ACPI_FUNCTION_TRACE("acpi_battery_remove_fs");
if (acpi_device_dir(device)) {
remove_proc_entry(ACPI_BATTERY_FILE_ALARM,
acpi_device_dir(device));
remove_proc_entry(ACPI_BATTERY_FILE_STATUS,
acpi_device_dir(device));
remove_proc_entry(ACPI_BATTERY_FILE_INFO,
acpi_device_dir(device));
remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
acpi_device_dir(device) = NULL;
}
return_VALUE(0);
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_battery *battery = (struct acpi_battery *)data;
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("acpi_battery_notify");
if (!battery)
return_VOID;
if (acpi_bus_get_device(handle, &device))
return_VOID;
switch (event) {
case ACPI_BATTERY_NOTIFY_STATUS:
case ACPI_BATTERY_NOTIFY_INFO:
acpi_battery_check(battery);
acpi_bus_generate_event(device, event, battery->flags.present);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return_VOID;
}
static int acpi_battery_add(struct acpi_device *device)
{
int result = 0;
acpi_status status = 0;
struct acpi_battery *battery = NULL;
ACPI_FUNCTION_TRACE("acpi_battery_add");
if (!device)
return_VALUE(-EINVAL);
battery = kmalloc(sizeof(struct acpi_battery), GFP_KERNEL);
if (!battery)
return_VALUE(-ENOMEM);
memset(battery, 0, sizeof(struct acpi_battery));
battery->handle = device->handle;
strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
acpi_driver_data(device) = battery;
result = acpi_battery_check(battery);
if (result)
goto end;
result = acpi_battery_add_fs(device);
if (result)
goto end;
status = acpi_install_notify_handler(battery->handle,
ACPI_DEVICE_NOTIFY,
acpi_battery_notify, battery);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error installing notify handler\n"));
result = -ENODEV;
goto end;
}
printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
device->status.battery_present ? "present" : "absent");
end:
if (result) {
acpi_battery_remove_fs(device);
kfree(battery);
}
return_VALUE(result);
}
static int acpi_battery_remove(struct acpi_device *device, int type)
{
acpi_status status = 0;
struct acpi_battery *battery = NULL;
ACPI_FUNCTION_TRACE("acpi_battery_remove");
if (!device || !acpi_driver_data(device))
return_VALUE(-EINVAL);
battery = (struct acpi_battery *)acpi_driver_data(device);
status = acpi_remove_notify_handler(battery->handle,
ACPI_DEVICE_NOTIFY,
acpi_battery_notify);
if (ACPI_FAILURE(status))
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error removing notify handler\n"));
acpi_battery_remove_fs(device);
kfree(battery);
return_VALUE(0);
}
static int __init acpi_battery_init(void)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_battery_init");
acpi_battery_dir = proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
if (!acpi_battery_dir)
return_VALUE(-ENODEV);
acpi_battery_dir->owner = THIS_MODULE;
result = acpi_bus_register_driver(&acpi_battery_driver);
if (result < 0) {
remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
return_VALUE(-ENODEV);
}
return_VALUE(0);
}
static void __exit acpi_battery_exit(void)
{
ACPI_FUNCTION_TRACE("acpi_battery_exit");
acpi_bus_unregister_driver(&acpi_battery_driver);
remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
return_VOID;
}
module_init(acpi_battery_init);
module_exit(acpi_battery_exit);
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