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linux/drivers/acpi/sbs.c

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/*
* acpi_sbs.c - ACPI Smart Battery System Driver ($Revision: 1.16 $)
*
* Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include "i2c_ec.h"
#define DEF_CAPACITY_UNIT 3
#define MAH_CAPACITY_UNIT 1
#define MWH_CAPACITY_UNIT 2
#define CAPACITY_UNIT DEF_CAPACITY_UNIT
#define REQUEST_UPDATE_MODE 1
#define QUEUE_UPDATE_MODE 2
#define DATA_TYPE_COMMON 0
#define DATA_TYPE_INFO 1
#define DATA_TYPE_STATE 2
#define DATA_TYPE_ALARM 3
#define DATA_TYPE_AC_STATE 4
extern struct proc_dir_entry *acpi_lock_ac_dir(void);
extern struct proc_dir_entry *acpi_lock_battery_dir(void);
extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
#define ACPI_SBS_COMPONENT 0x00080000
#define ACPI_SBS_CLASS "sbs"
#define ACPI_AC_CLASS "ac_adapter"
#define ACPI_BATTERY_CLASS "battery"
#define ACPI_SBS_HID "ACPI0002"
#define ACPI_SBS_DEVICE_NAME "Smart Battery System"
#define ACPI_SBS_FILE_INFO "info"
#define ACPI_SBS_FILE_STATE "state"
#define ACPI_SBS_FILE_ALARM "alarm"
#define ACPI_BATTERY_DIR_NAME "BAT%i"
#define ACPI_AC_DIR_NAME "AC0"
#define ACPI_SBC_SMBUS_ADDR 0x9
#define ACPI_SBSM_SMBUS_ADDR 0xa
#define ACPI_SB_SMBUS_ADDR 0xb
#define ACPI_SBS_AC_NOTIFY_STATUS 0x80
#define ACPI_SBS_BATTERY_NOTIFY_STATUS 0x80
#define ACPI_SBS_BATTERY_NOTIFY_INFO 0x81
#define _COMPONENT ACPI_SBS_COMPONENT
#define MAX_SBS_BAT 4
#define MAX_SMBUS_ERR 1
ACPI_MODULE_NAME("sbs");
MODULE_AUTHOR("Rich Townsend");
MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
MODULE_LICENSE("GPL");
static struct semaphore sbs_sem;
#define UPDATE_MODE QUEUE_UPDATE_MODE
/* REQUEST_UPDATE_MODE QUEUE_UPDATE_MODE */
#define UPDATE_INFO_MODE 0
#define UPDATE_TIME 60
#define UPDATE_TIME2 0
static int capacity_mode = CAPACITY_UNIT;
static int update_mode = UPDATE_MODE;
static int update_info_mode = UPDATE_INFO_MODE;
static int update_time = UPDATE_TIME;
static int update_time2 = UPDATE_TIME2;
module_param(capacity_mode, int, 0);
module_param(update_mode, int, 0);
module_param(update_info_mode, int, 0);
module_param(update_time, int, 0);
module_param(update_time2, int, 0);
static int acpi_sbs_add(struct acpi_device *device);
static int acpi_sbs_remove(struct acpi_device *device, int type);
static void acpi_battery_smbus_err_handler(struct acpi_ec_smbus *smbus);
static void acpi_sbs_update_queue(void *data);
static struct acpi_driver acpi_sbs_driver = {
.name = "sbs",
.class = ACPI_SBS_CLASS,
.ids = ACPI_SBS_HID,
.ops = {
.add = acpi_sbs_add,
.remove = acpi_sbs_remove,
},
};
struct acpi_battery_info {
int capacity_mode;
s16 full_charge_capacity;
s16 design_capacity;
s16 design_voltage;
int vscale;
int ipscale;
s16 serial_number;
char manufacturer_name[I2C_SMBUS_BLOCK_MAX + 3];
char device_name[I2C_SMBUS_BLOCK_MAX + 3];
char device_chemistry[I2C_SMBUS_BLOCK_MAX + 3];
};
struct acpi_battery_state {
s16 voltage;
s16 amperage;
s16 remaining_capacity;
s16 average_time_to_empty;
s16 average_time_to_full;
s16 battery_status;
};
struct acpi_battery_alarm {
s16 remaining_capacity;
};
struct acpi_battery {
int alive;
int battery_present;
int id;
int init_state;
struct acpi_sbs *sbs;
struct acpi_battery_info info;
struct acpi_battery_state state;
struct acpi_battery_alarm alarm;
struct proc_dir_entry *battery_entry;
};
struct acpi_sbs {
acpi_handle handle;
struct acpi_device *device;
struct acpi_ec_smbus *smbus;
int sbsm_present;
int sbsm_batteries_supported;
int ac_present;
struct proc_dir_entry *ac_entry;
struct acpi_battery battery[MAX_SBS_BAT];
int update_info_mode;
int zombie;
int update_time;
int update_time2;
struct timer_list update_timer;
};
static void acpi_update_delay(struct acpi_sbs *sbs);
static int acpi_sbs_update_run(struct acpi_sbs *sbs, int data_type);
/* --------------------------------------------------------------------------
SMBus Communication
-------------------------------------------------------------------------- */
static void acpi_battery_smbus_err_handler(struct acpi_ec_smbus *smbus)
{
union i2c_smbus_data data;
int result = 0;
char *err_str;
int err_number;
data.word = 0;
result = smbus->adapter.algo->
smbus_xfer(&smbus->adapter,
ACPI_SB_SMBUS_ADDR,
0, I2C_SMBUS_READ, 0x16, I2C_SMBUS_BLOCK_DATA, &data);
err_number = (data.word & 0x000f);
switch (data.word & 0x000f) {
case 0x0000:
err_str = "unexpected bus error";
break;
case 0x0001:
err_str = "busy";
break;
case 0x0002:
err_str = "reserved command";
break;
case 0x0003:
err_str = "unsupported command";
break;
case 0x0004:
err_str = "access denied";
break;
case 0x0005:
err_str = "overflow/underflow";
break;
case 0x0006:
err_str = "bad size";
break;
case 0x0007:
err_str = "unknown error";
break;
default:
err_str = "unrecognized error";
}
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"%s: ret %i, err %i\n", err_str, result, err_number));
}
static int
acpi_sbs_smbus_read_word(struct acpi_ec_smbus *smbus, int addr, int func,
u16 * word,
void (*err_handler) (struct acpi_ec_smbus * smbus))
{
union i2c_smbus_data data;
int result = 0;
int i;
if (err_handler == NULL) {
err_handler = acpi_battery_smbus_err_handler;
}
for (i = 0; i < MAX_SMBUS_ERR; i++) {
result =
smbus->adapter.algo->smbus_xfer(&smbus->adapter, addr, 0,
I2C_SMBUS_READ, func,
I2C_SMBUS_WORD_DATA, &data);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"try %i: smbus->adapter.algo->smbus_xfer() failed\n",
i));
if (err_handler) {
err_handler(smbus);
}
} else {
*word = data.word;
break;
}
}
return result;
}
static int
acpi_sbs_smbus_read_str(struct acpi_ec_smbus *smbus, int addr, int func,
char *str,
void (*err_handler) (struct acpi_ec_smbus * smbus))
{
union i2c_smbus_data data;
int result = 0;
int i;
if (err_handler == NULL) {
err_handler = acpi_battery_smbus_err_handler;
}
for (i = 0; i < MAX_SMBUS_ERR; i++) {
result =
smbus->adapter.algo->smbus_xfer(&smbus->adapter, addr, 0,
I2C_SMBUS_READ, func,
I2C_SMBUS_BLOCK_DATA,
&data);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"try %i: smbus->adapter.algo->smbus_xfer() failed\n",
i));
if (err_handler) {
err_handler(smbus);
}
} else {
strncpy(str, (const char *)data.block + 1,
data.block[0]);
str[data.block[0]] = 0;
break;
}
}
return result;
}
static int
acpi_sbs_smbus_write_word(struct acpi_ec_smbus *smbus, int addr, int func,
int word,
void (*err_handler) (struct acpi_ec_smbus * smbus))
{
union i2c_smbus_data data;
int result = 0;
int i;
if (err_handler == NULL) {
err_handler = acpi_battery_smbus_err_handler;
}
data.word = word;
for (i = 0; i < MAX_SMBUS_ERR; i++) {
result =
smbus->adapter.algo->smbus_xfer(&smbus->adapter, addr, 0,
I2C_SMBUS_WRITE, func,
I2C_SMBUS_WORD_DATA, &data);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"try %i: smbus->adapter.algo"
"->smbus_xfer() failed\n", i));
if (err_handler) {
err_handler(smbus);
}
} else {
break;
}
}
return result;
}
/* --------------------------------------------------------------------------
Smart Battery System Management
-------------------------------------------------------------------------- */
/* Smart Battery */
static int acpi_sbs_generate_event(struct acpi_device *device,
int event, int state, char *bid, char *class)
{
char bid_saved[5];
char class_saved[20];
int result = 0;
strcpy(bid_saved, acpi_device_bid(device));
strcpy(class_saved, acpi_device_class(device));
strcpy(acpi_device_bid(device), bid);
strcpy(acpi_device_class(device), class);
result = acpi_bus_generate_event(device, event, state);
strcpy(acpi_device_bid(device), bid_saved);
strcpy(acpi_device_class(device), class_saved);
return result;
}
static int acpi_battery_get_present(struct acpi_battery *battery)
{
s16 state;
int result = 0;
int is_present = 0;
result = acpi_sbs_smbus_read_word(battery->sbs->smbus,
ACPI_SBSM_SMBUS_ADDR, 0x01,
&state, NULL);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed"));
}
if (!result) {
is_present = (state & 0x000f) & (1 << battery->id);
}
battery->battery_present = is_present;
return result;
}
static int acpi_battery_is_present(struct acpi_battery *battery)
{
return (battery->battery_present);
}
static int acpi_ac_is_present(struct acpi_sbs *sbs)
{
return (sbs->ac_present);
}
static int acpi_battery_select(struct acpi_battery *battery)
{
struct acpi_ec_smbus *smbus = battery->sbs->smbus;
int result = 0;
s16 state;
int foo;
if (battery->sbs->sbsm_present) {
/* Take special care not to knobble other nibbles of
* state (aka selector_state), since
* it causes charging to halt on SBSELs */
result =
acpi_sbs_smbus_read_word(smbus, ACPI_SBSM_SMBUS_ADDR, 0x01,
&state, NULL);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
foo = (state & 0x0fff) | (1 << (battery->id + 12));
result =
acpi_sbs_smbus_write_word(smbus, ACPI_SBSM_SMBUS_ADDR, 0x01,
foo, NULL);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_write_word() failed\n"));
goto end;
}
}
end:
return result;
}
static int acpi_sbsm_get_info(struct acpi_sbs *sbs)
{
struct acpi_ec_smbus *smbus = sbs->smbus;
int result = 0;
s16 battery_system_info;
result = acpi_sbs_smbus_read_word(smbus, ACPI_SBSM_SMBUS_ADDR, 0x04,
&battery_system_info, NULL);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
sbs->sbsm_batteries_supported = battery_system_info & 0x000f;
end:
return result;
}
static int acpi_battery_get_info(struct acpi_battery *battery)
{
struct acpi_ec_smbus *smbus = battery->sbs->smbus;
int result = 0;
s16 battery_mode;
s16 specification_info;
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x03,
&battery_mode,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
battery->info.capacity_mode = (battery_mode & 0x8000) >> 15;
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x10,
&battery->info.full_charge_capacity,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x18,
&battery->info.design_capacity,
&acpi_battery_smbus_err_handler);
if (result) {
goto end;
}
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x19,
&battery->info.design_voltage,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x1a,
&specification_info,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
switch ((specification_info & 0x0f00) >> 8) {
case 1:
battery->info.vscale = 10;
break;
case 2:
battery->info.vscale = 100;
break;
case 3:
battery->info.vscale = 1000;
break;
default:
battery->info.vscale = 1;
}
switch ((specification_info & 0xf000) >> 12) {
case 1:
battery->info.ipscale = 10;
break;
case 2:
battery->info.ipscale = 100;
break;
case 3:
battery->info.ipscale = 1000;
break;
default:
battery->info.ipscale = 1;
}
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x1c,
&battery->info.serial_number,
&acpi_battery_smbus_err_handler);
if (result) {
goto end;
}
result = acpi_sbs_smbus_read_str(smbus, ACPI_SB_SMBUS_ADDR, 0x20,
battery->info.manufacturer_name,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_str() failed\n"));
goto end;
}
result = acpi_sbs_smbus_read_str(smbus, ACPI_SB_SMBUS_ADDR, 0x21,
battery->info.device_name,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_str() failed\n"));
goto end;
}
result = acpi_sbs_smbus_read_str(smbus, ACPI_SB_SMBUS_ADDR, 0x22,
battery->info.device_chemistry,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_str() failed\n"));
goto end;
}
end:
return result;
}
static void acpi_update_delay(struct acpi_sbs *sbs)
{
if (sbs->zombie) {
return;
}
if (sbs->update_time2 > 0) {
msleep(sbs->update_time2 * 1000);
}
}
static int acpi_battery_get_state(struct acpi_battery *battery)
{
struct acpi_ec_smbus *smbus = battery->sbs->smbus;
int result = 0;
acpi_update_delay(battery->sbs);
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x09,
&battery->state.voltage,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
acpi_update_delay(battery->sbs);
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x0a,
&battery->state.amperage,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
acpi_update_delay(battery->sbs);
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x0f,
&battery->state.remaining_capacity,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
acpi_update_delay(battery->sbs);
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x12,
&battery->state.average_time_to_empty,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
acpi_update_delay(battery->sbs);
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x13,
&battery->state.average_time_to_full,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
acpi_update_delay(battery->sbs);
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x16,
&battery->state.battery_status,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
acpi_update_delay(battery->sbs);
end:
return result;
}
static int acpi_battery_get_alarm(struct acpi_battery *battery)
{
struct acpi_ec_smbus *smbus = battery->sbs->smbus;
int result = 0;
result = acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x01,
&battery->alarm.remaining_capacity,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
acpi_update_delay(battery->sbs);
end:
return result;
}
static int acpi_battery_set_alarm(struct acpi_battery *battery,
unsigned long alarm)
{
struct acpi_ec_smbus *smbus = battery->sbs->smbus;
int result = 0;
s16 battery_mode;
int foo;
result = acpi_battery_select(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_select() failed\n"));
goto end;
}
/* If necessary, enable the alarm */
if (alarm > 0) {
result =
acpi_sbs_smbus_read_word(smbus, ACPI_SB_SMBUS_ADDR, 0x03,
&battery_mode,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
result =
acpi_sbs_smbus_write_word(smbus, ACPI_SB_SMBUS_ADDR, 0x01,
battery_mode & 0xbfff,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_write_word() failed\n"));
goto end;
}
}
foo = alarm / (battery->info.capacity_mode ? 10 : 1);
result = acpi_sbs_smbus_write_word(smbus, ACPI_SB_SMBUS_ADDR, 0x01,
foo,
&acpi_battery_smbus_err_handler);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_write_word() failed\n"));
goto end;
}
end:
return result;
}
static int acpi_battery_set_mode(struct acpi_battery *battery)
{
int result = 0;
s16 battery_mode;
if (capacity_mode == DEF_CAPACITY_UNIT) {
goto end;
}
result = acpi_sbs_smbus_read_word(battery->sbs->smbus,
ACPI_SB_SMBUS_ADDR, 0x03,
&battery_mode, NULL);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
if (capacity_mode == MAH_CAPACITY_UNIT) {
battery_mode &= 0x7fff;
} else {
battery_mode |= 0x8000;
}
result = acpi_sbs_smbus_write_word(battery->sbs->smbus,
ACPI_SB_SMBUS_ADDR, 0x03,
battery_mode, NULL);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_write_word() failed\n"));
goto end;
}
result = acpi_sbs_smbus_read_word(battery->sbs->smbus,
ACPI_SB_SMBUS_ADDR, 0x03,
&battery_mode, NULL);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
end:
return result;
}
static int acpi_battery_init(struct acpi_battery *battery)
{
int result = 0;
result = acpi_battery_select(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_init() failed\n"));
goto end;
}
result = acpi_battery_set_mode(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_set_mode() failed\n"));
goto end;
}
result = acpi_battery_get_info(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_get_info() failed\n"));
goto end;
}
result = acpi_battery_get_state(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_get_state() failed\n"));
goto end;
}
result = acpi_battery_get_alarm(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_get_alarm() failed\n"));
goto end;
}
end:
return result;
}
static int acpi_ac_get_present(struct acpi_sbs *sbs)
{
struct acpi_ec_smbus *smbus = sbs->smbus;
int result = 0;
s16 charger_status;
result = acpi_sbs_smbus_read_word(smbus, ACPI_SBC_SMBUS_ADDR, 0x13,
&charger_status, NULL);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_smbus_read_word() failed\n"));
goto end;
}
sbs->ac_present = (charger_status & 0x8000) >> 15;
end:
return result;
}
/* --------------------------------------------------------------------------
FS Interface (/proc/acpi)
-------------------------------------------------------------------------- */
/* Generic Routines */
static int
acpi_sbs_generic_add_fs(struct proc_dir_entry **dir,
struct proc_dir_entry *parent_dir,
char *dir_name,
struct file_operations *info_fops,
struct file_operations *state_fops,
struct file_operations *alarm_fops, void *data)
{
struct proc_dir_entry *entry = NULL;
if (!*dir) {
*dir = proc_mkdir(dir_name, parent_dir);
if (!*dir) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"proc_mkdir() failed\n"));
return -ENODEV;
}
(*dir)->owner = THIS_MODULE;
}
/* 'info' [R] */
if (info_fops) {
entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
if (!entry) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"create_proc_entry() failed\n"));
} else {
entry->proc_fops = info_fops;
entry->data = data;
entry->owner = THIS_MODULE;
}
}
/* 'state' [R] */
if (state_fops) {
entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
if (!entry) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"create_proc_entry() failed\n"));
} else {
entry->proc_fops = state_fops;
entry->data = data;
entry->owner = THIS_MODULE;
}
}
/* 'alarm' [R/W] */
if (alarm_fops) {
entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
if (!entry) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"create_proc_entry() failed\n"));
} else {
entry->proc_fops = alarm_fops;
entry->data = data;
entry->owner = THIS_MODULE;
}
}
return 0;
}
static void
acpi_sbs_generic_remove_fs(struct proc_dir_entry **dir,
struct proc_dir_entry *parent_dir)
{
if (*dir) {
remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
remove_proc_entry((*dir)->name, parent_dir);
*dir = NULL;
}
}
/* Smart Battery Interface */
static struct proc_dir_entry *acpi_battery_dir = NULL;
static int acpi_battery_read_info(struct seq_file *seq, void *offset)
{
struct acpi_battery *battery = seq->private;
int cscale;
int result = 0;
if (battery->sbs->zombie) {
return -ENODEV;
}
down(&sbs_sem);
if (update_mode == REQUEST_UPDATE_MODE) {
result = acpi_sbs_update_run(battery->sbs, DATA_TYPE_INFO);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_update_run() failed\n"));
}
}
if (acpi_battery_is_present(battery)) {
seq_printf(seq, "present: yes\n");
} else {
seq_printf(seq, "present: no\n");
goto end;
}
if (battery->info.capacity_mode) {
cscale = battery->info.vscale * battery->info.ipscale;
} else {
cscale = battery->info.ipscale;
}
seq_printf(seq, "design capacity: %i%s",
battery->info.design_capacity * cscale,
battery->info.capacity_mode ? "0 mWh\n" : " mAh\n");
seq_printf(seq, "last full capacity: %i%s",
battery->info.full_charge_capacity * cscale,
battery->info.capacity_mode ? "0 mWh\n" : " mAh\n");
seq_printf(seq, "battery technology: rechargeable\n");
seq_printf(seq, "design voltage: %i mV\n",
battery->info.design_voltage * battery->info.vscale);
seq_printf(seq, "design capacity warning: unknown\n");
seq_printf(seq, "design capacity low: unknown\n");
seq_printf(seq, "capacity granularity 1: unknown\n");
seq_printf(seq, "capacity granularity 2: unknown\n");
seq_printf(seq, "model number: %s\n",
battery->info.device_name);
seq_printf(seq, "serial number: %i\n",
battery->info.serial_number);
seq_printf(seq, "battery type: %s\n",
battery->info.device_chemistry);
seq_printf(seq, "OEM info: %s\n",
battery->info.manufacturer_name);
end:
up(&sbs_sem);
return result;
}
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)
{
struct acpi_battery *battery = (struct acpi_battery *)seq->private;
int result = 0;
int cscale;
int foo;
if (battery->sbs->zombie) {
return -ENODEV;
}
down(&sbs_sem);
if (update_mode == REQUEST_UPDATE_MODE) {
result = acpi_sbs_update_run(battery->sbs, DATA_TYPE_STATE);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_update_run() failed\n"));
}
}
if (acpi_battery_is_present(battery)) {
seq_printf(seq, "present: yes\n");
} else {
seq_printf(seq, "present: no\n");
goto end;
}
if (battery->info.capacity_mode) {
cscale = battery->info.vscale * battery->info.ipscale;
} else {
cscale = battery->info.ipscale;
}
if (battery->state.battery_status & 0x0010) {
seq_printf(seq, "capacity state: critical\n");
} else {
seq_printf(seq, "capacity state: ok\n");
}
foo = (s16) battery->state.amperage * battery->info.ipscale;
if (battery->info.capacity_mode) {
foo = foo * battery->info.design_voltage / 1000;
}
if (battery->state.amperage < 0) {
seq_printf(seq, "charging state: discharging\n");
seq_printf(seq, "present rate: %d %s\n",
-foo, battery->info.capacity_mode ? "mW" : "mA");
} else if (battery->state.amperage > 0) {
seq_printf(seq, "charging state: charging\n");
seq_printf(seq, "present rate: %d %s\n",
foo, battery->info.capacity_mode ? "mW" : "mA");
} else {
seq_printf(seq, "charging state: charged\n");
seq_printf(seq, "present rate: 0 %s\n",
battery->info.capacity_mode ? "mW" : "mA");
}
seq_printf(seq, "remaining capacity: %i%s",
battery->state.remaining_capacity * cscale,
battery->info.capacity_mode ? "0 mWh\n" : " mAh\n");
seq_printf(seq, "present voltage: %i mV\n",
battery->state.voltage * battery->info.vscale);
end:
up(&sbs_sem);
return result;
}
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 = seq->private;
int result = 0;
int cscale;
if (battery->sbs->zombie) {
return -ENODEV;
}
down(&sbs_sem);
if (update_mode == REQUEST_UPDATE_MODE) {
result = acpi_sbs_update_run(battery->sbs, DATA_TYPE_ALARM);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_update_run() failed\n"));
}
}
if (!acpi_battery_is_present(battery)) {
seq_printf(seq, "present: no\n");
goto end;
}
if (battery->info.capacity_mode) {
cscale = battery->info.vscale * battery->info.ipscale;
} else {
cscale = battery->info.ipscale;
}
seq_printf(seq, "alarm: ");
if (battery->alarm.remaining_capacity) {
seq_printf(seq, "%i%s",
battery->alarm.remaining_capacity * cscale,
battery->info.capacity_mode ? "0 mWh\n" : " mAh\n");
} else {
seq_printf(seq, "disabled\n");
}
end:
up(&sbs_sem);
return result;
}
static ssize_t
acpi_battery_write_alarm(struct file *file, const char __user * buffer,
size_t count, loff_t * ppos)
{
struct seq_file *seq = file->private_data;
struct acpi_battery *battery = seq->private;
char alarm_string[12] = { '\0' };
int result, old_alarm, new_alarm;
if (battery->sbs->zombie) {
return -ENODEV;
}
down(&sbs_sem);
if (!acpi_battery_is_present(battery)) {
result = -ENODEV;
goto end;
}
if (count > sizeof(alarm_string) - 1) {
result = -EINVAL;
goto end;
}
if (copy_from_user(alarm_string, buffer, count)) {
result = -EFAULT;
goto end;
}
alarm_string[count] = 0;
old_alarm = battery->alarm.remaining_capacity;
new_alarm = simple_strtoul(alarm_string, NULL, 0);
result = acpi_battery_set_alarm(battery, new_alarm);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_set_alarm() failed\n"));
acpi_battery_set_alarm(battery, old_alarm);
goto end;
}
result = acpi_battery_get_alarm(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_get_alarm() failed\n"));
acpi_battery_set_alarm(battery, old_alarm);
goto end;
}
end:
up(&sbs_sem);
if (result) {
return result;
} else {
return 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_fops = {
.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_fops = {
.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_fops = {
.open = acpi_battery_alarm_open_fs,
.read = seq_read,
.write = acpi_battery_write_alarm,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
/* Legacy AC Adapter Interface */
static struct proc_dir_entry *acpi_ac_dir = NULL;
static int acpi_ac_read_state(struct seq_file *seq, void *offset)
{
struct acpi_sbs *sbs = seq->private;
int result;
if (sbs->zombie) {
return -ENODEV;
}
down(&sbs_sem);
if (update_mode == REQUEST_UPDATE_MODE) {
result = acpi_sbs_update_run(sbs, DATA_TYPE_AC_STATE);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_update_run() failed\n"));
}
}
seq_printf(seq, "state: %s\n",
sbs->ac_present ? "on-line" : "off-line");
up(&sbs_sem);
return 0;
}
static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_ac_read_state, PDE(inode)->data);
}
static struct file_operations acpi_ac_state_fops = {
.open = acpi_ac_state_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
/* Smart Battery */
static int acpi_battery_add(struct acpi_sbs *sbs, int id)
{
int is_present;
int result;
char dir_name[32];
struct acpi_battery *battery;
battery = &sbs->battery[id];
battery->alive = 0;
battery->init_state = 0;
battery->id = id;
battery->sbs = sbs;
result = acpi_battery_select(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_select() failed\n"));
goto end;
}
result = acpi_battery_get_present(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_get_present() failed\n"));
goto end;
}
is_present = acpi_battery_is_present(battery);
if (is_present) {
result = acpi_battery_init(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_init() failed\n"));
goto end;
}
battery->init_state = 1;
}
sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
result = acpi_sbs_generic_add_fs(&battery->battery_entry,
acpi_battery_dir,
dir_name,
&acpi_battery_info_fops,
&acpi_battery_state_fops,
&acpi_battery_alarm_fops, battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_generic_add_fs() failed\n"));
goto end;
}
battery->alive = 1;
end:
return result;
}
static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
{
if (sbs->battery[id].battery_entry) {
acpi_sbs_generic_remove_fs(&(sbs->battery[id].battery_entry),
acpi_battery_dir);
}
}
static int acpi_ac_add(struct acpi_sbs *sbs)
{
int result;
result = acpi_ac_get_present(sbs);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_ac_get_present() failed\n"));
goto end;
}
result = acpi_sbs_generic_add_fs(&sbs->ac_entry,
acpi_ac_dir,
ACPI_AC_DIR_NAME,
NULL, &acpi_ac_state_fops, NULL, sbs);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_generic_add_fs() failed\n"));
goto end;
}
end:
return result;
}
static void acpi_ac_remove(struct acpi_sbs *sbs)
{
if (sbs->ac_entry) {
acpi_sbs_generic_remove_fs(&sbs->ac_entry, acpi_ac_dir);
}
}
static void acpi_sbs_update_queue_run(unsigned long data)
{
acpi_os_execute(OSL_GPE_HANDLER, acpi_sbs_update_queue, (void *)data);
}
static int acpi_sbs_update_run(struct acpi_sbs *sbs, int data_type)
{
struct acpi_battery *battery;
int result = 0;
int old_ac_present;
int old_battery_present;
int new_ac_present;
int new_battery_present;
int id;
char dir_name[32];
int do_battery_init, do_ac_init;
s16 old_remaining_capacity;
if (sbs->zombie) {
goto end;
}
old_ac_present = acpi_ac_is_present(sbs);
result = acpi_ac_get_present(sbs);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_ac_get_present() failed\n"));
}
new_ac_present = acpi_ac_is_present(sbs);
do_ac_init = (old_ac_present != new_ac_present);
if (data_type == DATA_TYPE_AC_STATE) {
goto end;
}
for (id = 0; id < MAX_SBS_BAT; id++) {
battery = &sbs->battery[id];
if (battery->alive == 0) {
continue;
}
old_remaining_capacity = battery->state.remaining_capacity;
old_battery_present = acpi_battery_is_present(battery);
result = acpi_battery_select(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_select() failed\n"));
}
if (sbs->zombie) {
goto end;
}
result = acpi_battery_get_present(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_get_present() failed\n"));
}
if (sbs->zombie) {
goto end;
}
new_battery_present = acpi_battery_is_present(battery);
do_battery_init = ((old_battery_present != new_battery_present)
&& new_battery_present);
if (sbs->zombie) {
goto end;
}
if (do_ac_init || do_battery_init ||
update_info_mode || sbs->update_info_mode) {
if (sbs->update_info_mode) {
sbs->update_info_mode = 0;
} else {
sbs->update_info_mode = 1;
}
result = acpi_battery_init(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_init() "
"failed\n"));
}
}
if (data_type == DATA_TYPE_INFO) {
continue;
}
if (sbs->zombie) {
goto end;
}
if (new_battery_present) {
result = acpi_battery_get_alarm(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_get_alarm() "
"failed\n"));
}
if (data_type == DATA_TYPE_ALARM) {
continue;
}
result = acpi_battery_get_state(battery);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_get_state() "
"failed\n"));
}
}
if (sbs->zombie) {
goto end;
}
if (data_type != DATA_TYPE_COMMON) {
continue;
}
if (old_battery_present != new_battery_present) {
sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
result = acpi_sbs_generate_event(sbs->device,
ACPI_SBS_BATTERY_NOTIFY_STATUS,
new_battery_present,
dir_name,
ACPI_BATTERY_CLASS);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_generate_event() "
"failed\n"));
}
}
if (old_remaining_capacity != battery->state.remaining_capacity) {
sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
result = acpi_sbs_generate_event(sbs->device,
ACPI_SBS_BATTERY_NOTIFY_STATUS,
new_battery_present,
dir_name,
ACPI_BATTERY_CLASS);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_generate_event() failed\n"));
}
}
}
if (sbs->zombie) {
goto end;
}
if (data_type != DATA_TYPE_COMMON) {
goto end;
}
if (old_ac_present != new_ac_present) {
result = acpi_sbs_generate_event(sbs->device,
ACPI_SBS_AC_NOTIFY_STATUS,
new_ac_present,
ACPI_AC_DIR_NAME,
ACPI_AC_CLASS);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_generate_event() failed\n"));
}
}
end:
return result;
}
static void acpi_sbs_update_queue(void *data)
{
struct acpi_sbs *sbs = data;
unsigned long delay = -1;
int result;
if (sbs->zombie) {
goto end;
}
result = acpi_sbs_update_run(sbs, DATA_TYPE_COMMON);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_update_run() failed\n"));
}
if (sbs->zombie) {
goto end;
}
if (update_mode == REQUEST_UPDATE_MODE) {
goto end;
}
delay = jiffies + HZ * update_time;
sbs->update_timer.data = (unsigned long)data;
sbs->update_timer.function = acpi_sbs_update_queue_run;
sbs->update_timer.expires = delay;
add_timer(&sbs->update_timer);
end:
;
}
static int acpi_sbs_add(struct acpi_device *device)
{
struct acpi_sbs *sbs = NULL;
struct acpi_ec_hc *ec_hc = NULL;
int result, remove_result = 0;
unsigned long sbs_obj;
int id, cnt;
acpi_status status = AE_OK;
sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
if (!sbs) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "kmalloc() failed\n"));
return -ENOMEM;
}
cnt = 0;
while (cnt < 10) {
cnt++;
ec_hc = acpi_get_ec_hc(device);
if (ec_hc) {
break;
}
msleep(1000);
}
if (!ec_hc) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_get_ec_hc() failed: "
"NO driver found for EC HC SMBus\n"));
result = -ENODEV;
goto end;
}
sbs->device = device;
sbs->smbus = ec_hc->smbus;
strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
acpi_driver_data(device) = sbs;
sbs->update_time = 0;
sbs->update_time2 = 0;
result = acpi_ac_add(sbs);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "acpi_ac_add() failed\n"));
goto end;
}
result = acpi_evaluate_integer(device->handle, "_SBS", NULL, &sbs_obj);
if (ACPI_FAILURE(result)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_evaluate_integer() failed\n"));
result = -EIO;
goto end;
}
if (sbs_obj > 0) {
result = acpi_sbsm_get_info(sbs);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbsm_get_info() failed\n"));
goto end;
}
sbs->sbsm_present = 1;
}
if (sbs->sbsm_present == 0) {
result = acpi_battery_add(sbs, 0);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_add() failed\n"));
goto end;
}
} else {
for (id = 0; id < MAX_SBS_BAT; id++) {
if ((sbs->sbsm_batteries_supported & (1 << id))) {
result = acpi_battery_add(sbs, id);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_battery_add() "
"failed\n"));
goto end;
}
}
}
}
sbs->handle = device->handle;
init_timer(&sbs->update_timer);
if (update_mode == QUEUE_UPDATE_MODE) {
status = acpi_os_execute(OSL_GPE_HANDLER,
acpi_sbs_update_queue, sbs);
if (status != AE_OK) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_os_execute() failed\n"));
}
}
sbs->update_time = update_time;
sbs->update_time2 = update_time2;
printk(KERN_INFO PREFIX "%s [%s]\n",
acpi_device_name(device), acpi_device_bid(device));
end:
if (result) {
remove_result = acpi_sbs_remove(device, 0);
if (remove_result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_sbs_remove() failed\n"));
}
}
return result;
}
int acpi_sbs_remove(struct acpi_device *device, int type)
{
struct acpi_sbs *sbs;
int id;
if (!device) {
return -EINVAL;
}
sbs = (struct acpi_sbs *)acpi_driver_data(device);
if (!sbs) {
return -EINVAL;
}
sbs->zombie = 1;
sbs->update_time = 0;
sbs->update_time2 = 0;
del_timer_sync(&sbs->update_timer);
acpi_os_wait_events_complete(NULL);
del_timer_sync(&sbs->update_timer);
for (id = 0; id < MAX_SBS_BAT; id++) {
acpi_battery_remove(sbs, id);
}
acpi_ac_remove(sbs);
kfree(sbs);
return 0;
}
static int __init acpi_sbs_init(void)
{
int result = 0;
if (acpi_disabled)
return -ENODEV;
init_MUTEX(&sbs_sem);
if (capacity_mode != DEF_CAPACITY_UNIT
&& capacity_mode != MAH_CAPACITY_UNIT
&& capacity_mode != MWH_CAPACITY_UNIT) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "acpi_sbs_init: "
"invalid capacity_mode = %d\n",
capacity_mode));
return -EINVAL;
}
acpi_ac_dir = acpi_lock_ac_dir();
if (!acpi_ac_dir) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_lock_ac_dir() failed\n"));
return -ENODEV;
}
acpi_battery_dir = acpi_lock_battery_dir();
if (!acpi_battery_dir) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_lock_battery_dir() failed\n"));
return -ENODEV;
}
result = acpi_bus_register_driver(&acpi_sbs_driver);
if (result < 0) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"acpi_bus_register_driver() failed\n"));
return -ENODEV;
}
return 0;
}
static void __exit acpi_sbs_exit(void)
{
acpi_bus_unregister_driver(&acpi_sbs_driver);
acpi_unlock_ac_dir(acpi_ac_dir);
acpi_ac_dir = NULL;
acpi_unlock_battery_dir(acpi_battery_dir);
acpi_battery_dir = NULL;
return;
}
module_init(acpi_sbs_init);
module_exit(acpi_sbs_exit);
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