/*
* 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_DEVICE_NAME "Battery"
#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
#define ACPI_BATTERY_UPDATE_TIME 0
#define ACPI_BATTERY_NONE_UPDATE 0
#define ACPI_BATTERY_EASY_UPDATE 1
#define ACPI_BATTERY_INIT_UPDATE 2
ACPI_MODULE_NAME("battery");
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Battery Driver");
MODULE_LICENSE("GPL");
static unsigned int update_time = ACPI_BATTERY_UPDATE_TIME;
/* 0 - every time, > 0 - by update_time */
module_param(update_time, uint, 0644);
extern struct proc_dir_entry *acpi_lock_battery_dir(void);
extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
static int acpi_battery_add(struct acpi_device *device);
static int acpi_battery_remove(struct acpi_device *device, int type);
static int acpi_battery_resume(struct acpi_device *device);
static const struct acpi_device_id battery_device_ids[] = {
{"PNP0C0A", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, battery_device_ids);
static struct acpi_driver acpi_battery_driver = {
.name = "battery",
.class = ACPI_BATTERY_CLASS,
.ids = battery_device_ids,
.ops = {
.add = acpi_battery_add,
.resume = acpi_battery_resume,
.remove = acpi_battery_remove,
},
};
struct acpi_battery_state {
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;
};
enum acpi_battery_files {
ACPI_BATTERY_INFO = 0,
ACPI_BATTERY_STATE,
ACPI_BATTERY_ALARM,
ACPI_BATTERY_NUMFILES,
};
struct acpi_battery_flags {
u8 battery_present_prev;
u8 alarm_present;
u8 init_update;
u8 update[ACPI_BATTERY_NUMFILES];
u8 power_unit;
};
struct acpi_battery {
struct acpi_device *device;
struct acpi_battery_flags flags;
struct acpi_buffer bif_data;
struct acpi_buffer bst_data;
struct mutex lock;
unsigned long alarm;
unsigned long update_time[ACPI_BATTERY_NUMFILES];
};
inline int acpi_battery_present(struct acpi_battery *battery)
{
return battery->device->status.battery_present;
}
inline char *acpi_battery_power_units(struct acpi_battery *battery)
{
if (battery->flags.power_unit)
return ACPI_BATTERY_UNITS_AMPS;
else
return ACPI_BATTERY_UNITS_WATTS;
}
inline acpi_handle acpi_battery_handle(struct acpi_battery *battery)
{
return battery->device->handle;
}
/* --------------------------------------------------------------------------
Battery Management
-------------------------------------------------------------------------- */
static void acpi_battery_check_result(struct acpi_battery *battery, int result)
{
if (!battery)
return;
if (result) {
battery->flags.init_update = 1;
}
}
static int acpi_battery_extract_package(struct acpi_battery *battery,
union acpi_object *package,
struct acpi_buffer *format,
struct acpi_buffer *data,
char *package_name)
{
acpi_status status = AE_OK;
struct acpi_buffer data_null = { 0, NULL };
status = acpi_extract_package(package, format, &data_null);
if (status != AE_BUFFER_OVERFLOW) {
ACPI_EXCEPTION((AE_INFO, status, "Extracting size %s",
package_name));
return -ENODEV;
}
if (data_null.length != data->length) {
kfree(data->pointer);
data->pointer = kzalloc(data_null.length, GFP_KERNEL);
if (!data->pointer) {
ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY, "kzalloc()"));
return -ENOMEM;
}
data->length = data_null.length;
}
status = acpi_extract_package(package, format, data);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Extracting %s",
package_name));
return -ENODEV;
}
return 0;
}
static int acpi_battery_get_status(struct acpi_battery *battery)
{
int result = 0;
result = acpi_bus_get_status(battery->device);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
return -ENODEV;
}
return result;
}
static int acpi_battery_get_info(struct acpi_battery *battery)
{
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
};
union acpi_object *package = NULL;
struct acpi_buffer *data = NULL;
struct acpi_battery_info *bif = NULL;
battery->update_time[ACPI_BATTERY_INFO] = get_seconds();
if (!acpi_battery_present(battery))
return 0;
/* Evaluate _BIF */
mutex_lock(&battery->lock);
status = acpi_evaluate_object(acpi_battery_handle(battery), "_BIF",
NULL, &buffer);
mutex_unlock(&battery->lock);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
return -ENODEV;
}
package = buffer.pointer;
data = &battery->bif_data;
/* Extract Package Data */
result =
acpi_battery_extract_package(battery, package, &format, data,
"_BIF");
if (result)
goto end;
end:
kfree(buffer.pointer);
if (!result) {
bif = data->pointer;
battery->flags.power_unit = bif->power_unit;
}
return result;
}
static int acpi_battery_get_state(struct acpi_battery *battery)
{
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
};
union acpi_object *package = NULL;
struct acpi_buffer *data = NULL;
battery->update_time[ACPI_BATTERY_STATE] = get_seconds();
if (!acpi_battery_present(battery))
return 0;
/* Evaluate _BST */
mutex_lock(&battery->lock);
status = acpi_evaluate_object(acpi_battery_handle(battery), "_BST",
NULL, &buffer);
mutex_unlock(&battery->lock);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
return -ENODEV;
}
package = buffer.pointer;
data = &battery->bst_data;
/* Extract Package Data */
result =
acpi_battery_extract_package(battery, package, &format, data,
"_BST");
if (result)
goto end;
end:
kfree(buffer.pointer);
return result;
}
static int acpi_battery_get_alarm(struct acpi_battery *battery)
{
battery->update_time[ACPI_BATTERY_ALARM] = get_seconds();
return 0;
}
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 };
battery->update_time[ACPI_BATTERY_ALARM] = get_seconds();
if (!acpi_battery_present(battery))
return -ENODEV;
if (!battery->flags.alarm_present)
return -ENODEV;
arg0.integer.value = alarm;
mutex_lock(&battery->lock);
status = acpi_evaluate_object(acpi_battery_handle(battery), "_BTP",
&arg_list, NULL);
mutex_unlock(&battery->lock);
if (ACPI_FAILURE(status))
return -ENODEV;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", (u32) alarm));
battery->alarm = alarm;
return 0;
}
static int acpi_battery_init_alarm(struct acpi_battery *battery)
{
int result = 0;
acpi_status status = AE_OK;
acpi_handle handle = NULL;
struct acpi_battery_info *bif = battery->bif_data.pointer;
unsigned long alarm = battery->alarm;
/* See if alarms are supported, and if so, set default */
status = acpi_get_handle(acpi_battery_handle(battery), "_BTP", &handle);
if (ACPI_SUCCESS(status)) {
battery->flags.alarm_present = 1;
if (!alarm && bif) {
alarm = bif->design_capacity_warning;
}
result = acpi_battery_set_alarm(battery, alarm);
if (result)
goto end;
} else {
battery->flags.alarm_present = 0;
}
end:
return result;
}
static int acpi_battery_init_update(struct acpi_battery *battery)
{
int result = 0;
result = acpi_battery_get_status(battery);
if (result)
return result;
battery->flags.battery_present_prev = acpi_battery_present(battery);
if (acpi_battery_present(battery)) {
result = acpi_battery_get_info(battery);
if (result)
return result;
result = acpi_battery_get_state(battery);
if (result)
return result;
acpi_battery_init_alarm(battery);
}
return result;
}
static int acpi_battery_update(struct acpi_battery *battery,
int update, int *update_result_ptr)
{
int result = 0;
int update_result = ACPI_BATTERY_NONE_UPDATE;
if (!acpi_battery_present(battery)) {
update = 1;
}
if (battery->flags.init_update) {
result = acpi_battery_init_update(battery);
if (result)
goto end;
update_result = ACPI_BATTERY_INIT_UPDATE;
} else if (update) {
result = acpi_battery_get_status(battery);
if (result)
goto end;
if ((!battery->flags.battery_present_prev & acpi_battery_present(battery))
|| (battery->flags.battery_present_prev & !acpi_battery_present(battery))) {
result = acpi_battery_init_update(battery);
if (result)
goto end;
update_result = ACPI_BATTERY_INIT_UPDATE;
} else {
update_result = ACPI_BATTERY_EASY_UPDATE;
}
}
end:
battery->flags.init_update = (result != 0);
*update_result_ptr = update_result;
return result;
}
static void acpi_battery_notify_update(struct acpi_battery *battery)
{
acpi_battery_get_status(battery);
if (battery->flags.init_update) {
return;
}
if ((!battery->flags.battery_present_prev &
acpi_battery_present(battery)) ||
(battery->flags.battery_present_prev &
!acpi_battery_present(battery))) {
battery->flags.init_update = 1;
} else {
battery->flags.update[ACPI_BATTERY_INFO] = 1;
battery->flags.update[ACPI_BATTERY_STATE] = 1;
battery->flags.update[ACPI_BATTERY_ALARM] = 1;
}
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
static struct proc_dir_entry *acpi_battery_dir;
static int acpi_battery_print_info(struct seq_file *seq, int result)
{
struct acpi_battery *battery = seq->private;
struct acpi_battery_info *bif = NULL;
char *units = "?";
if (result)
goto end;
if (acpi_battery_present(battery))
seq_printf(seq, "present: yes\n");
else {
seq_printf(seq, "present: no\n");
goto end;
}
bif = battery->bif_data.pointer;
if (!bif) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR, "BIF buffer is NULL"));
result = -ENODEV;
goto end;
}
/* Battery Units */
units = acpi_battery_power_units(battery);
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:
if (result)
seq_printf(seq, "ERROR: Unable to read battery info\n");
return result;
}
static int acpi_battery_print_state(struct seq_file *seq, int result)
{
struct acpi_battery *battery = seq->private;
struct acpi_battery_state *bst = NULL;
char *units = "?";
if (result)
goto end;
if (acpi_battery_present(battery))
seq_printf(seq, "present: yes\n");
else {
seq_printf(seq, "present: no\n");
goto end;
}
bst = battery->bst_data.pointer;
if (!bst) {
ACPI_EXCEPTION((AE_INFO, AE_ERROR, "BST buffer is NULL"));
result = -ENODEV;
goto end;
}
/* Battery Units */
units = acpi_battery_power_units(battery);
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");
} 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:
if (result) {
seq_printf(seq, "ERROR: Unable to read battery state\n");
}
return result;
}
static int acpi_battery_print_alarm(struct seq_file *seq, int result)
{
struct acpi_battery *battery = seq->private;
char *units = "?";
if (result)
goto end;
if (!acpi_battery_present(battery)) {
seq_printf(seq, "present: no\n");
goto end;
}
/* Battery Units */
units = acpi_battery_power_units(battery);
seq_printf(seq, "alarm: ");
if (!battery->alarm)
seq_printf(seq, "unsupported\n");
else
seq_printf(seq, "%lu %sh\n", battery->alarm, units);
end:
if (result)
seq_printf(seq, "ERROR: Unable to read battery alarm\n");
return result;
}
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 = file->private_data;
struct acpi_battery *battery = m->private;
int update_result = ACPI_BATTERY_NONE_UPDATE;
if (!battery || (count > sizeof(alarm_string) - 1))
return -EINVAL;
result = acpi_battery_update(battery, 1, &update_result);
if (result) {
result = -ENODEV;
goto end;
}
if (!acpi_battery_present(battery)) {
result = -ENODEV;
goto end;
}
if (copy_from_user(alarm_string, buffer, count)) {
result = -EFAULT;
goto end;
}
alarm_string[count] = '\0';
result = acpi_battery_set_alarm(battery,
simple_strtoul(alarm_string, NULL, 0));
if (result)
goto end;
end:
acpi_battery_check_result(battery, result);
if (!result)
return count;
return result;
}
typedef int(*print_func)(struct seq_file *seq, int result);
typedef int(*get_func)(struct acpi_battery *battery);
static struct acpi_read_mux {
print_func print;
get_func get;
} acpi_read_funcs[ACPI_BATTERY_NUMFILES] = {
{.get = acpi_battery_get_info, .print = acpi_battery_print_info},
{.get = acpi_battery_get_state, .print = acpi_battery_print_state},
{.get = acpi_battery_get_alarm, .print = acpi_battery_print_alarm},
};
static int acpi_battery_read(int fid, struct seq_file *seq)
{
struct acpi_battery *battery = seq->private;
int result = 0;
int update_result = ACPI_BATTERY_NONE_UPDATE;
int update = 0;
update = (get_seconds() - battery->update_time[fid] >= update_time);
update = (update | battery->flags.update[fid]);
result = acpi_battery_update(battery, update, &update_result);
if (result)
goto end;
if (update_result == ACPI_BATTERY_EASY_UPDATE) {
result = acpi_read_funcs[fid].get(battery);
if (result)
goto end;
}
end:
result = acpi_read_funcs[fid].print(seq, result);
acpi_battery_check_result(battery, result);
battery->flags.update[fid] = result;
return result;
}
static int acpi_battery_read_info(struct seq_file *seq, void *offset)
{
return acpi_battery_read(ACPI_BATTERY_INFO, seq);
}
static int acpi_battery_read_state(struct seq_file *seq, void *offset)
{
return acpi_battery_read(ACPI_BATTERY_STATE, seq);
}
static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
{
return acpi_battery_read(ACPI_BATTERY_ALARM, seq);
}
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_state_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_battery_read_state, PDE(inode)->data);
}
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 battery_file {
struct file_operations ops;
mode_t mode;
char *name;
} acpi_battery_file[] = {
{
.name = "info",
.mode = S_IRUGO,
.ops = {
.open = acpi_battery_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
},
},
{
.name = "state",
.mode = S_IRUGO,
.ops = {
.open = acpi_battery_state_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
},
},
{
.name = "alarm",
.mode = S_IFREG | S_IRUGO | S_IWUSR,
.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;
int i;
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
acpi_battery_dir);
if (!acpi_device_dir(device))
return -ENODEV;
acpi_device_dir(device)->owner = THIS_MODULE;
}
for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
entry = create_proc_entry(acpi_battery_file[i].name,
acpi_battery_file[i].mode, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_battery_file[i].ops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
}
return 0;
}
static int acpi_battery_remove_fs(struct acpi_device *device)
{
int i;
if (acpi_device_dir(device)) {
for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
remove_proc_entry(acpi_battery_file[i].name,
acpi_device_dir(device));
}
remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
acpi_device_dir(device) = NULL;
}
return 0;
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_battery *battery = data;
struct acpi_device *device = NULL;
if (!battery)
return;
device = battery->device;
switch (event) {
case ACPI_BATTERY_NOTIFY_STATUS:
case ACPI_BATTERY_NOTIFY_INFO:
case ACPI_NOTIFY_BUS_CHECK:
case ACPI_NOTIFY_DEVICE_CHECK:
device = battery->device;
acpi_battery_notify_update(battery);
acpi_bus_generate_proc_event(device, event,
acpi_battery_present(battery));
acpi_bus_generate_netlink_event(device->pnp.device_class,
device->dev.bus_id, event,
acpi_battery_present(battery));
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return;
}
static int acpi_battery_add(struct acpi_device *device)
{
int result = 0;
acpi_status status = 0;
struct acpi_battery *battery = NULL;
if (!device)
return -EINVAL;
battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
if (!battery)
return -ENOMEM;
mutex_init(&battery->lock);
battery->device = device;
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_get_status(battery);
if (result)
goto end;
battery->flags.init_update = 1;
result = acpi_battery_add_fs(device);
if (result)
goto end;
status = acpi_install_notify_handler(device->handle,
ACPI_ALL_NOTIFY,
acpi_battery_notify, battery);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
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 result;
}
static int acpi_battery_remove(struct acpi_device *device, int type)
{
acpi_status status = 0;
struct acpi_battery *battery = NULL;
if (!device || !acpi_driver_data(device))
return -EINVAL;
battery = acpi_driver_data(device);
status = acpi_remove_notify_handler(device->handle,
ACPI_ALL_NOTIFY,
acpi_battery_notify);
acpi_battery_remove_fs(device);
kfree(battery->bif_data.pointer);
kfree(battery->bst_data.pointer);
mutex_destroy(&battery->lock);
kfree(battery);
return 0;
}
/* this is needed to learn about changes made in suspended state */
static int acpi_battery_resume(struct acpi_device *device)
{
struct acpi_battery *battery;
if (!device)
return -EINVAL;
battery = device->driver_data;
battery->flags.init_update = 1;
return 0;
}
static int __init acpi_battery_init(void)
{
int result;
if (acpi_disabled)
return -ENODEV;
acpi_battery_dir = acpi_lock_battery_dir();
if (!acpi_battery_dir)
return -ENODEV;
result = acpi_bus_register_driver(&acpi_battery_driver);
if (result < 0) {
acpi_unlock_battery_dir(acpi_battery_dir);
return -ENODEV;
}
return 0;
}
static void __exit acpi_battery_exit(void)
{
acpi_bus_unregister_driver(&acpi_battery_driver);
acpi_unlock_battery_dir(acpi_battery_dir);
return;
}
module_init(acpi_battery_init);
module_exit(acpi_battery_exit);
