--- /dev/null
+/*
+ * battery.c - ACPI Battery Driver (Revision: 2.0)
+ *
+ * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
+ * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
+ * 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/jiffies.h>
+#include <linux/async.h>
+#include <linux/dmi.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
+#include <asm/unaligned.h>
+
+#ifdef CONFIG_ACPI_PROCFS_POWER
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <asm/uaccess.h>
+#endif
+
+#include <linux/acpi.h>
+#include <linux/power_supply.h>
+
+#include "battery.h"
+
+#define PREFIX "ACPI: "
+
+#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
+
+#define ACPI_BATTERY_DEVICE_NAME "Battery"
+
+/* Battery power unit: 0 means mW, 1 means mA */
+#define ACPI_BATTERY_POWER_UNIT_MA 1
+
+#define ACPI_BATTERY_STATE_DISCHARGING 0x1
+#define ACPI_BATTERY_STATE_CHARGING 0x2
+#define ACPI_BATTERY_STATE_CRITICAL 0x4
+
+#define _COMPONENT ACPI_BATTERY_COMPONENT
+
+ACPI_MODULE_NAME("battery");
+
+MODULE_AUTHOR("Paul Diefenbaugh");
+MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
+MODULE_DESCRIPTION("ACPI Battery Driver");
+MODULE_LICENSE("GPL");
+
+static int battery_bix_broken_package;
+static int battery_notification_delay_ms;
+static unsigned int cache_time = 1000;
+module_param(cache_time, uint, 0644);
+MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
+
+#ifdef CONFIG_ACPI_PROCFS_POWER
+extern struct proc_dir_entry *acpi_lock_battery_dir(void);
+extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
+
+enum acpi_battery_files {
+ info_tag = 0,
+ state_tag,
+ alarm_tag,
+ ACPI_BATTERY_NUMFILES,
+};
+
+#endif
+
+static const struct acpi_device_id battery_device_ids[] = {
+ {"PNP0C0A", 0},
+ {"", 0},
+};
+
+MODULE_DEVICE_TABLE(acpi, battery_device_ids);
+
+enum {
+ ACPI_BATTERY_ALARM_PRESENT,
+ ACPI_BATTERY_XINFO_PRESENT,
+ ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
+ /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
+ switches between mWh and mAh depending on whether the system
+ is running on battery or not. When mAh is the unit, most
+ reported values are incorrect and need to be adjusted by
+ 10000/design_voltage. Verified on x201, t410, t410s, and x220.
+ Pre-2010 and 2012 models appear to always report in mWh and
+ are thus unaffected (tested with t42, t61, t500, x200, x300,
+ and x230). Also, in mid-2012 Lenovo issued a BIOS update for
+ the 2011 models that fixes the issue (tested on x220 with a
+ post-1.29 BIOS), but as of Nov. 2012, no such update is
+ available for the 2010 models. */
+ ACPI_BATTERY_QUIRK_THINKPAD_MAH,
+};
+
+struct acpi_battery {
+ struct mutex lock;
+ struct mutex sysfs_lock;
+ struct power_supply *bat;
+ struct power_supply_desc bat_desc;
+ struct acpi_device *device;
+ struct notifier_block pm_nb;
+ unsigned long update_time;
+ int revision;
+ int rate_now;
+ int capacity_now;
+ int voltage_now;
+ int design_capacity;
+ int full_charge_capacity;
+ int technology;
+ int design_voltage;
+ int design_capacity_warning;
+ int design_capacity_low;
+ int cycle_count;
+ int measurement_accuracy;
+ int max_sampling_time;
+ int min_sampling_time;
+ int max_averaging_interval;
+ int min_averaging_interval;
+ int capacity_granularity_1;
+ int capacity_granularity_2;
+ int alarm;
+ char model_number[32];
+ char serial_number[32];
+ char type[32];
+ char oem_info[32];
+ int state;
+ int power_unit;
+ unsigned long flags;
+};
+
+#define to_acpi_battery(x) power_supply_get_drvdata(x)
+
+static inline int acpi_battery_present(struct acpi_battery *battery)
+{
+ return battery->device->status.battery_present;
+}
+
+static int acpi_battery_technology(struct acpi_battery *battery)
+{
+ if (!strcasecmp("NiCd", battery->type))
+ return POWER_SUPPLY_TECHNOLOGY_NiCd;
+ if (!strcasecmp("NiMH", battery->type))
+ return POWER_SUPPLY_TECHNOLOGY_NiMH;
+ if (!strcasecmp("LION", battery->type))
+ return POWER_SUPPLY_TECHNOLOGY_LION;
+ if (!strncasecmp("LI-ION", battery->type, 6))
+ return POWER_SUPPLY_TECHNOLOGY_LION;
+ if (!strcasecmp("LiP", battery->type))
+ return POWER_SUPPLY_TECHNOLOGY_LIPO;
+ return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
+}
+
+static int acpi_battery_get_state(struct acpi_battery *battery);
+
+static int acpi_battery_is_charged(struct acpi_battery *battery)
+{
+ /* charging, discharging or critical low */
+ if (battery->state != 0)
+ return 0;
+
+ /* battery not reporting charge */
+ if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
+ battery->capacity_now == 0)
+ return 0;
+
+ /* good batteries update full_charge as the batteries degrade */
+ if (battery->full_charge_capacity == battery->capacity_now)
+ return 1;
+
+ /* fallback to using design values for broken batteries */
+ if (battery->design_capacity == battery->capacity_now)
+ return 1;
+
+ /* we don't do any sort of metric based on percentages */
+ return 0;
+}
+
+static int acpi_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret = 0;
+ struct acpi_battery *battery = to_acpi_battery(psy);
+
+ if (acpi_battery_present(battery)) {
+ /* run battery update only if it is present */
+ acpi_battery_get_state(battery);
+ } else if (psp != POWER_SUPPLY_PROP_PRESENT)
+ return -ENODEV;
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ else if (acpi_battery_is_charged(battery))
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else
+ val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = acpi_battery_present(battery);
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = acpi_battery_technology(battery);
+ break;
+ case POWER_SUPPLY_PROP_CYCLE_COUNT:
+ val->intval = battery->cycle_count;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
+ ret = -ENODEV;
+ else
+ val->intval = battery->design_voltage * 1000;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
+ ret = -ENODEV;
+ else
+ val->intval = battery->voltage_now * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ case POWER_SUPPLY_PROP_POWER_NOW:
+ if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
+ ret = -ENODEV;
+ else
+ val->intval = battery->rate_now * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
+ if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ ret = -ENODEV;
+ else
+ val->intval = battery->design_capacity * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ case POWER_SUPPLY_PROP_ENERGY_FULL:
+ if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ ret = -ENODEV;
+ else
+ val->intval = battery->full_charge_capacity * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ case POWER_SUPPLY_PROP_ENERGY_NOW:
+ if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
+ ret = -ENODEV;
+ else
+ val->intval = battery->capacity_now * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ if (battery->capacity_now && battery->full_charge_capacity)
+ val->intval = battery->capacity_now * 100/
+ battery->full_charge_capacity;
+ else
+ val->intval = 0;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+ if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
+ val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
+ else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
+ (battery->capacity_now <= battery->alarm))
+ val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+ else if (acpi_battery_is_charged(battery))
+ val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
+ else
+ val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+ break;
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = battery->model_number;
+ break;
+ case POWER_SUPPLY_PROP_MANUFACTURER:
+ val->strval = battery->oem_info;
+ break;
+ case POWER_SUPPLY_PROP_SERIAL_NUMBER:
+ val->strval = battery->serial_number;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ return ret;
+}
+
+static enum power_supply_property charge_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_CYCLE_COUNT,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_MANUFACTURER,
+ POWER_SUPPLY_PROP_SERIAL_NUMBER,
+};
+
+static enum power_supply_property energy_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_CYCLE_COUNT,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_POWER_NOW,
+ POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
+ POWER_SUPPLY_PROP_ENERGY_FULL,
+ POWER_SUPPLY_PROP_ENERGY_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_MANUFACTURER,
+ POWER_SUPPLY_PROP_SERIAL_NUMBER,
+};
+
+#ifdef CONFIG_ACPI_PROCFS_POWER
+inline char *acpi_battery_units(struct acpi_battery *battery)
+{
+ return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
+ "mA" : "mW";
+}
+#endif
+
+/* --------------------------------------------------------------------------
+ Battery Management
+ -------------------------------------------------------------------------- */
+struct acpi_offsets {
+ size_t offset; /* offset inside struct acpi_sbs_battery */
+ u8 mode; /* int or string? */
+};
+
+static struct acpi_offsets state_offsets[] = {
+ {offsetof(struct acpi_battery, state), 0},
+ {offsetof(struct acpi_battery, rate_now), 0},
+ {offsetof(struct acpi_battery, capacity_now), 0},
+ {offsetof(struct acpi_battery, voltage_now), 0},
+};
+
+static struct acpi_offsets info_offsets[] = {
+ {offsetof(struct acpi_battery, power_unit), 0},
+ {offsetof(struct acpi_battery, design_capacity), 0},
+ {offsetof(struct acpi_battery, full_charge_capacity), 0},
+ {offsetof(struct acpi_battery, technology), 0},
+ {offsetof(struct acpi_battery, design_voltage), 0},
+ {offsetof(struct acpi_battery, design_capacity_warning), 0},
+ {offsetof(struct acpi_battery, design_capacity_low), 0},
+ {offsetof(struct acpi_battery, capacity_granularity_1), 0},
+ {offsetof(struct acpi_battery, capacity_granularity_2), 0},
+ {offsetof(struct acpi_battery, model_number), 1},
+ {offsetof(struct acpi_battery, serial_number), 1},
+ {offsetof(struct acpi_battery, type), 1},
+ {offsetof(struct acpi_battery, oem_info), 1},
+};
+
+static struct acpi_offsets extended_info_offsets[] = {
+ {offsetof(struct acpi_battery, revision), 0},
+ {offsetof(struct acpi_battery, power_unit), 0},
+ {offsetof(struct acpi_battery, design_capacity), 0},
+ {offsetof(struct acpi_battery, full_charge_capacity), 0},
+ {offsetof(struct acpi_battery, technology), 0},
+ {offsetof(struct acpi_battery, design_voltage), 0},
+ {offsetof(struct acpi_battery, design_capacity_warning), 0},
+ {offsetof(struct acpi_battery, design_capacity_low), 0},
+ {offsetof(struct acpi_battery, cycle_count), 0},
+ {offsetof(struct acpi_battery, measurement_accuracy), 0},
+ {offsetof(struct acpi_battery, max_sampling_time), 0},
+ {offsetof(struct acpi_battery, min_sampling_time), 0},
+ {offsetof(struct acpi_battery, max_averaging_interval), 0},
+ {offsetof(struct acpi_battery, min_averaging_interval), 0},
+ {offsetof(struct acpi_battery, capacity_granularity_1), 0},
+ {offsetof(struct acpi_battery, capacity_granularity_2), 0},
+ {offsetof(struct acpi_battery, model_number), 1},
+ {offsetof(struct acpi_battery, serial_number), 1},
+ {offsetof(struct acpi_battery, type), 1},
+ {offsetof(struct acpi_battery, oem_info), 1},
+};
+
+static int extract_package(struct acpi_battery *battery,
+ union acpi_object *package,
+ struct acpi_offsets *offsets, int num)
+{
+ int i;
+ union acpi_object *element;
+ if (package->type != ACPI_TYPE_PACKAGE)
+ return -EFAULT;
+ for (i = 0; i < num; ++i) {
+ if (package->package.count <= i)
+ return -EFAULT;
+ element = &package->package.elements[i];
+ if (offsets[i].mode) {
+ u8 *ptr = (u8 *)battery + offsets[i].offset;
+ if (element->type == ACPI_TYPE_STRING ||
+ element->type == ACPI_TYPE_BUFFER)
+ strncpy(ptr, element->string.pointer, 32);
+ else if (element->type == ACPI_TYPE_INTEGER) {
+ strncpy(ptr, (u8 *)&element->integer.value,
+ sizeof(u64));
+ ptr[sizeof(u64)] = 0;
+ } else
+ *ptr = 0; /* don't have value */
+ } else {
+ int *x = (int *)((u8 *)battery + offsets[i].offset);
+ *x = (element->type == ACPI_TYPE_INTEGER) ?
+ element->integer.value : -1;
+ }
+ }
+ return 0;
+}
+
+static int acpi_battery_get_status(struct acpi_battery *battery)
+{
+ if (acpi_bus_get_status(battery->device)) {
+ ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static int acpi_battery_get_info(struct acpi_battery *battery)
+{
+ int result = -EFAULT;
+ acpi_status status = 0;
+ char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags) ?
+ "_BIX" : "_BIF";
+
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+
+ if (!acpi_battery_present(battery))
+ return 0;
+ mutex_lock(&battery->lock);
+ status = acpi_evaluate_object(battery->device->handle, name,
+ NULL, &buffer);
+ mutex_unlock(&battery->lock);
+
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
+ return -ENODEV;
+ }
+
+ if (battery_bix_broken_package)
+ result = extract_package(battery, buffer.pointer,
+ extended_info_offsets + 1,
+ ARRAY_SIZE(extended_info_offsets) - 1);
+ else if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
+ result = extract_package(battery, buffer.pointer,
+ extended_info_offsets,
+ ARRAY_SIZE(extended_info_offsets));
+ else
+ result = extract_package(battery, buffer.pointer,
+ info_offsets, ARRAY_SIZE(info_offsets));
+ kfree(buffer.pointer);
+ if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
+ battery->full_charge_capacity = battery->design_capacity;
+ if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
+ battery->power_unit && battery->design_voltage) {
+ battery->design_capacity = battery->design_capacity *
+ 10000 / battery->design_voltage;
+ battery->full_charge_capacity = battery->full_charge_capacity *
+ 10000 / battery->design_voltage;
+ battery->design_capacity_warning =
+ battery->design_capacity_warning *
+ 10000 / battery->design_voltage;
+ /* Curiously, design_capacity_low, unlike the rest of them,
+ is correct. */
+ /* capacity_granularity_* equal 1 on the systems tested, so
+ it's impossible to tell if they would need an adjustment
+ or not if their values were higher. */
+ }
+ 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 };
+
+ if (!acpi_battery_present(battery))
+ return 0;
+
+ if (battery->update_time &&
+ time_before(jiffies, battery->update_time +
+ msecs_to_jiffies(cache_time)))
+ return 0;
+
+ mutex_lock(&battery->lock);
+ status = acpi_evaluate_object(battery->device->handle, "_BST",
+ NULL, &buffer);
+ mutex_unlock(&battery->lock);
+
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
+ return -ENODEV;
+ }
+
+ result = extract_package(battery, buffer.pointer,
+ state_offsets, ARRAY_SIZE(state_offsets));
+ battery->update_time = jiffies;
+ kfree(buffer.pointer);
+
+ /* For buggy DSDTs that report negative 16-bit values for either
+ * charging or discharging current and/or report 0 as 65536
+ * due to bad math.
+ */
+ if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
+ battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
+ (s16)(battery->rate_now) < 0) {
+ battery->rate_now = abs((s16)battery->rate_now);
+ printk_once(KERN_WARNING FW_BUG
+ "battery: (dis)charge rate invalid.\n");
+ }
+
+ if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
+ && battery->capacity_now >= 0 && battery->capacity_now <= 100)
+ battery->capacity_now = (battery->capacity_now *
+ battery->full_charge_capacity) / 100;
+ if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
+ battery->power_unit && battery->design_voltage) {
+ battery->capacity_now = battery->capacity_now *
+ 10000 / battery->design_voltage;
+ }
+ return result;
+}
+
+static int acpi_battery_set_alarm(struct acpi_battery *battery)
+{
+ acpi_status status = 0;
+
+ if (!acpi_battery_present(battery) ||
+ !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
+ return -ENODEV;
+
+ mutex_lock(&battery->lock);
+ status = acpi_execute_simple_method(battery->device->handle, "_BTP",
+ battery->alarm);
+ mutex_unlock(&battery->lock);
+
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
+ return 0;
+}
+
+static int acpi_battery_init_alarm(struct acpi_battery *battery)
+{
+ /* See if alarms are supported, and if so, set default */
+ if (!acpi_has_method(battery->device->handle, "_BTP")) {
+ clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
+ return 0;
+ }
+ set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
+ if (!battery->alarm)
+ battery->alarm = battery->design_capacity_warning;
+ return acpi_battery_set_alarm(battery);
+}
+
+static ssize_t acpi_battery_alarm_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
+ return sprintf(buf, "%d\n", battery->alarm * 1000);
+}
+
+static ssize_t acpi_battery_alarm_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long x;
+ struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
+ if (sscanf(buf, "%lu\n", &x) == 1)
+ battery->alarm = x/1000;
+ if (acpi_battery_present(battery))
+ acpi_battery_set_alarm(battery);
+ return count;
+}
+
+static struct device_attribute alarm_attr = {
+ .attr = {.name = "alarm", .mode = 0644},
+ .show = acpi_battery_alarm_show,
+ .store = acpi_battery_alarm_store,
+};
+
+static int sysfs_add_battery(struct acpi_battery *battery)
+{
+ struct power_supply_config psy_cfg = { .drv_data = battery, };
+
+ if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
+ battery->bat_desc.properties = charge_battery_props;
+ battery->bat_desc.num_properties =
+ ARRAY_SIZE(charge_battery_props);
+ } else {
+ battery->bat_desc.properties = energy_battery_props;
+ battery->bat_desc.num_properties =
+ ARRAY_SIZE(energy_battery_props);
+ }
+
+ battery->bat_desc.name = acpi_device_bid(battery->device);
+ battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
+ battery->bat_desc.get_property = acpi_battery_get_property;
+
+ battery->bat = power_supply_register_no_ws(&battery->device->dev,
+ &battery->bat_desc, &psy_cfg);
+
+ if (IS_ERR(battery->bat)) {
+ int result = PTR_ERR(battery->bat);
+
+ battery->bat = NULL;
+ return result;
+ }
+ return device_create_file(&battery->bat->dev, &alarm_attr);
+}
+
+static void sysfs_remove_battery(struct acpi_battery *battery)
+{
+ mutex_lock(&battery->sysfs_lock);
+ if (!battery->bat) {
+ mutex_unlock(&battery->sysfs_lock);
+ return;
+ }
+
+ device_remove_file(&battery->bat->dev, &alarm_attr);
+ power_supply_unregister(battery->bat);
+ battery->bat = NULL;
+ mutex_unlock(&battery->sysfs_lock);
+}
+
+static void find_battery(const struct dmi_header *dm, void *private)
+{
+ struct acpi_battery *battery = (struct acpi_battery *)private;
+ /* Note: the hardcoded offsets below have been extracted from
+ the source code of dmidecode. */
+ if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
+ const u8 *dmi_data = (const u8 *)(dm + 1);
+ int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
+ if (dm->length >= 18)
+ dmi_capacity *= dmi_data[17];
+ if (battery->design_capacity * battery->design_voltage / 1000
+ != dmi_capacity &&
+ battery->design_capacity * 10 == dmi_capacity)
+ set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
+ &battery->flags);
+ }
+}
+
+/*
+ * According to the ACPI spec, some kinds of primary batteries can
+ * report percentage battery remaining capacity directly to OS.
+ * In this case, it reports the Last Full Charged Capacity == 100
+ * and BatteryPresentRate == 0xFFFFFFFF.
+ *
+ * Now we found some battery reports percentage remaining capacity
+ * even if it's rechargeable.
+ * https://bugzilla.kernel.org/show_bug.cgi?id=15979
+ *
+ * Handle this correctly so that they won't break userspace.
+ */
+static void acpi_battery_quirks(struct acpi_battery *battery)
+{
+ if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
+ return;
+
+ if (battery->full_charge_capacity == 100 &&
+ battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
+ battery->capacity_now >= 0 && battery->capacity_now <= 100) {
+ set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
+ battery->full_charge_capacity = battery->design_capacity;
+ battery->capacity_now = (battery->capacity_now *
+ battery->full_charge_capacity) / 100;
+ }
+
+ if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
+ return;
+
+ if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
+ const char *s;
+ s = dmi_get_system_info(DMI_PRODUCT_VERSION);
+ if (s && !strncasecmp(s, "ThinkPad", 8)) {
+ dmi_walk(find_battery, battery);
+ if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
+ &battery->flags) &&
+ battery->design_voltage) {
+ battery->design_capacity =
+ battery->design_capacity *
+ 10000 / battery->design_voltage;
+ battery->full_charge_capacity =
+ battery->full_charge_capacity *
+ 10000 / battery->design_voltage;
+ battery->design_capacity_warning =
+ battery->design_capacity_warning *
+ 10000 / battery->design_voltage;
+ battery->capacity_now = battery->capacity_now *
+ 10000 / battery->design_voltage;
+ }
+ }
+ }
+}
+
+static int acpi_battery_update(struct acpi_battery *battery, bool resume)
+{
+ int result, old_present = acpi_battery_present(battery);
+ result = acpi_battery_get_status(battery);
+ if (result)
+ return result;
+ if (!acpi_battery_present(battery)) {
+ sysfs_remove_battery(battery);
+ battery->update_time = 0;
+ return 0;
+ }
+
+ if (resume)
+ return 0;
+
+ if (!battery->update_time ||
+ old_present != acpi_battery_present(battery)) {
+ result = acpi_battery_get_info(battery);
+ if (result)
+ return result;
+ acpi_battery_init_alarm(battery);
+ }
+ if (!battery->bat) {
+ result = sysfs_add_battery(battery);
+ if (result)
+ return result;
+ }
+ result = acpi_battery_get_state(battery);
+ if (result)
+ return result;
+ acpi_battery_quirks(battery);
+
+ /*
+ * Wakeup the system if battery is critical low
+ * or lower than the alarm level
+ */
+ if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
+ (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
+ (battery->capacity_now <= battery->alarm)))
+ pm_wakeup_event(&battery->device->dev, 0);
+
+ return result;
+}
+
+static void acpi_battery_refresh(struct acpi_battery *battery)
+{
+ int power_unit;
+
+ if (!battery->bat)
+ return;
+
+ power_unit = battery->power_unit;
+
+ acpi_battery_get_info(battery);
+
+ if (power_unit == battery->power_unit)
+ return;
+
+ /* The battery has changed its reporting units. */
+ sysfs_remove_battery(battery);
+ sysfs_add_battery(battery);
+}
+
+/* --------------------------------------------------------------------------
+ FS Interface (/proc)
+ -------------------------------------------------------------------------- */
+
+#ifdef CONFIG_ACPI_PROCFS_POWER
+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;
+
+ if (result)
+ goto end;
+
+ seq_printf(seq, "present: %s\n",
+ acpi_battery_present(battery) ? "yes" : "no");
+ if (!acpi_battery_present(battery))
+ goto end;
+ if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "design capacity: unknown\n");
+ else
+ seq_printf(seq, "design capacity: %d %sh\n",
+ battery->design_capacity,
+ acpi_battery_units(battery));
+
+ if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "last full capacity: unknown\n");
+ else
+ seq_printf(seq, "last full capacity: %d %sh\n",
+ battery->full_charge_capacity,
+ acpi_battery_units(battery));
+
+ seq_printf(seq, "battery technology: %srechargeable\n",
+ (!battery->technology)?"non-":"");
+
+ if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "design voltage: unknown\n");
+ else
+ seq_printf(seq, "design voltage: %d mV\n",
+ battery->design_voltage);
+ seq_printf(seq, "design capacity warning: %d %sh\n",
+ battery->design_capacity_warning,
+ acpi_battery_units(battery));
+ seq_printf(seq, "design capacity low: %d %sh\n",
+ battery->design_capacity_low,
+ acpi_battery_units(battery));
+ seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
+ seq_printf(seq, "capacity granularity 1: %d %sh\n",
+ battery->capacity_granularity_1,
+ acpi_battery_units(battery));
+ seq_printf(seq, "capacity granularity 2: %d %sh\n",
+ battery->capacity_granularity_2,
+ acpi_battery_units(battery));
+ seq_printf(seq, "model number: %s\n", battery->model_number);
+ seq_printf(seq, "serial number: %s\n", battery->serial_number);
+ seq_printf(seq, "battery type: %s\n", battery->type);
+ seq_printf(seq, "OEM info: %s\n", battery->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;
+
+ if (result)
+ goto end;
+
+ seq_printf(seq, "present: %s\n",
+ acpi_battery_present(battery) ? "yes" : "no");
+ if (!acpi_battery_present(battery))
+ goto end;
+
+ seq_printf(seq, "capacity state: %s\n",
+ (battery->state & 0x04) ? "critical" : "ok");
+ if ((battery->state & 0x01) && (battery->state & 0x02))
+ seq_printf(seq,
+ "charging state: charging/discharging\n");
+ else if (battery->state & 0x01)
+ seq_printf(seq, "charging state: discharging\n");
+ else if (battery->state & 0x02)
+ seq_printf(seq, "charging state: charging\n");
+ else
+ seq_printf(seq, "charging state: charged\n");
+
+ if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "present rate: unknown\n");
+ else
+ seq_printf(seq, "present rate: %d %s\n",
+ battery->rate_now, acpi_battery_units(battery));
+
+ if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "remaining capacity: unknown\n");
+ else
+ seq_printf(seq, "remaining capacity: %d %sh\n",
+ battery->capacity_now, acpi_battery_units(battery));
+ if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "present voltage: unknown\n");
+ else
+ seq_printf(seq, "present voltage: %d mV\n",
+ battery->voltage_now);
+ 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;
+
+ if (result)
+ goto end;
+
+ if (!acpi_battery_present(battery)) {
+ seq_printf(seq, "present: no\n");
+ goto end;
+ }
+ seq_printf(seq, "alarm: ");
+ if (!battery->alarm)
+ seq_printf(seq, "unsupported\n");
+ else
+ seq_printf(seq, "%u %sh\n", battery->alarm,
+ acpi_battery_units(battery));
+ 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;
+
+ if (!battery || (count > sizeof(alarm_string) - 1))
+ return -EINVAL;
+ 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';
+ if (kstrtoint(alarm_string, 0, &battery->alarm)) {
+ result = -EINVAL;
+ goto end;
+ }
+ result = acpi_battery_set_alarm(battery);
+ end:
+ if (!result)
+ return count;
+ return result;
+}
+
+typedef int(*print_func)(struct seq_file *seq, int result);
+
+static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
+ acpi_battery_print_info,
+ acpi_battery_print_state,
+ acpi_battery_print_alarm,
+};
+
+static int acpi_battery_read(int fid, struct seq_file *seq)
+{
+ struct acpi_battery *battery = seq->private;
+ int result = acpi_battery_update(battery, false);
+ return acpi_print_funcs[fid](seq, result);
+}
+
+#define DECLARE_FILE_FUNCTIONS(_name) \
+static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
+{ \
+ return acpi_battery_read(_name##_tag, seq); \
+} \
+static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
+{ \
+ return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \
+}
+
+DECLARE_FILE_FUNCTIONS(info);
+DECLARE_FILE_FUNCTIONS(state);
+DECLARE_FILE_FUNCTIONS(alarm);
+
+#undef DECLARE_FILE_FUNCTIONS
+
+#define FILE_DESCRIPTION_RO(_name) \
+ { \
+ .name = __stringify(_name), \
+ .mode = S_IRUGO, \
+ .ops = { \
+ .open = acpi_battery_##_name##_open_fs, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = single_release, \
+ .owner = THIS_MODULE, \
+ }, \
+ }
+
+#define FILE_DESCRIPTION_RW(_name) \
+ { \
+ .name = __stringify(_name), \
+ .mode = S_IFREG | S_IRUGO | S_IWUSR, \
+ .ops = { \
+ .open = acpi_battery_##_name##_open_fs, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .write = acpi_battery_write_##_name, \
+ .release = single_release, \
+ .owner = THIS_MODULE, \
+ }, \
+ }
+
+static const struct battery_file {
+ struct file_operations ops;
+ umode_t mode;
+ const char *name;
+} acpi_battery_file[] = {
+ FILE_DESCRIPTION_RO(info),
+ FILE_DESCRIPTION_RO(state),
+ FILE_DESCRIPTION_RW(alarm),
+};
+
+#undef FILE_DESCRIPTION_RO
+#undef FILE_DESCRIPTION_RW
+
+static int acpi_battery_add_fs(struct acpi_device *device)
+{
+ struct proc_dir_entry *entry = NULL;
+ int i;
+
+ printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
+ " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
+ 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;
+ }
+
+ for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
+ entry = proc_create_data(acpi_battery_file[i].name,
+ acpi_battery_file[i].mode,
+ acpi_device_dir(device),
+ &acpi_battery_file[i].ops,
+ acpi_driver_data(device));
+ if (!entry)
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static void acpi_battery_remove_fs(struct acpi_device *device)
+{
+ int i;
+ if (!acpi_device_dir(device))
+ return;
+ 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;
+}
+
+#endif
+
+/* --------------------------------------------------------------------------
+ Driver Interface
+ -------------------------------------------------------------------------- */
+
+static void acpi_battery_notify(struct acpi_device *device, u32 event)
+{
+ struct acpi_battery *battery = acpi_driver_data(device);
+ struct power_supply *old;
+
+ if (!battery)
+ return;
+ old = battery->bat;
+ /*
+ * On Acer Aspire V5-573G notifications are sometimes triggered too
+ * early. For example, when AC is unplugged and notification is
+ * triggered, battery state is still reported as "Full", and changes to
+ * "Discharging" only after short delay, without any notification.
+ */
+ if (battery_notification_delay_ms > 0)
+ msleep(battery_notification_delay_ms);
+ if (event == ACPI_BATTERY_NOTIFY_INFO)
+ acpi_battery_refresh(battery);
+ acpi_battery_update(battery, false);
+ acpi_bus_generate_netlink_event(device->pnp.device_class,
+ dev_name(&device->dev), event,
+ acpi_battery_present(battery));
+ acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
+ /* acpi_battery_update could remove power_supply object */
+ if (old && battery->bat)
+ power_supply_changed(battery->bat);
+}
+
+static int battery_notify(struct notifier_block *nb,
+ unsigned long mode, void *_unused)
+{
+ struct acpi_battery *battery = container_of(nb, struct acpi_battery,
+ pm_nb);
+ int result;
+
+ switch (mode) {
+ case PM_POST_HIBERNATION:
+ case PM_POST_SUSPEND:
+ if (!acpi_battery_present(battery))
+ return 0;
+
+ if (!battery->bat) {
+ result = acpi_battery_get_info(battery);
+ if (result)
+ return result;
+
+ result = sysfs_add_battery(battery);
+ if (result)
+ return result;
+ } else
+ acpi_battery_refresh(battery);
+
+ acpi_battery_init_alarm(battery);
+ acpi_battery_get_state(battery);
+ break;
+ }
+
+ return 0;
+}
+
+static int battery_bix_broken_package_quirk(const struct dmi_system_id *d)
+{
+ battery_bix_broken_package = 1;
+ return 0;
+}
+
+static int battery_notification_delay_quirk(const struct dmi_system_id *d)
+{
+ battery_notification_delay_ms = 1000;
+ return 0;
+}
+
+static struct dmi_system_id bat_dmi_table[] = {
+ {
+ .callback = battery_bix_broken_package_quirk,
+ .ident = "NEC LZ750/LS",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
+ },
+ },
+ {
+ .callback = battery_notification_delay_quirk,
+ .ident = "Acer Aspire V5-573G",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
+ },
+ },
+ {},
+};
+
+/*
+ * Some machines'(E,G Lenovo Z480) ECs are not stable
+ * during boot up and this causes battery driver fails to be
+ * probed due to failure of getting battery information
+ * from EC sometimes. After several retries, the operation
+ * may work. So add retry code here and 20ms sleep between
+ * every retries.
+ */
+static int acpi_battery_update_retry(struct acpi_battery *battery)
+{
+ int retry, ret;
+
+ for (retry = 5; retry; retry--) {
+ ret = acpi_battery_update(battery, false);
+ if (!ret)
+ break;
+
+ msleep(20);
+ }
+ return ret;
+}
+
+static int acpi_battery_add(struct acpi_device *device)
+{
+ int result = 0;
+ struct acpi_battery *battery = NULL;
+
+ if (!device)
+ return -EINVAL;
+
+ if (device->dep_unmet)
+ return -EPROBE_DEFER;
+
+ battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
+ if (!battery)
+ return -ENOMEM;
+ battery->device = device;
+ strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
+ strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
+ device->driver_data = battery;
+ mutex_init(&battery->lock);
+ mutex_init(&battery->sysfs_lock);
+ if (acpi_has_method(battery->device->handle, "_BIX"))
+ set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
+
+ result = acpi_battery_update_retry(battery);
+ if (result)
+ goto fail;
+
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ result = acpi_battery_add_fs(device);
+#endif
+ if (result) {
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ acpi_battery_remove_fs(device);
+#endif
+ goto fail;
+ }
+
+ printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
+ ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
+ device->status.battery_present ? "present" : "absent");
+
+ battery->pm_nb.notifier_call = battery_notify;
+ register_pm_notifier(&battery->pm_nb);
+
+ device_init_wakeup(&device->dev, 1);
+
+ return result;
+
+fail:
+ sysfs_remove_battery(battery);
+ mutex_destroy(&battery->lock);
+ mutex_destroy(&battery->sysfs_lock);
+ kfree(battery);
+ return result;
+}
+
+static int acpi_battery_remove(struct acpi_device *device)
+{
+ struct acpi_battery *battery = NULL;
+
+ if (!device || !acpi_driver_data(device))
+ return -EINVAL;
+ device_init_wakeup(&device->dev, 0);
+ battery = acpi_driver_data(device);
+ unregister_pm_notifier(&battery->pm_nb);
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ acpi_battery_remove_fs(device);
+#endif
+ sysfs_remove_battery(battery);
+ mutex_destroy(&battery->lock);
+ mutex_destroy(&battery->sysfs_lock);
+ kfree(battery);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+/* this is needed to learn about changes made in suspended state */
+static int acpi_battery_resume(struct device *dev)
+{
+ struct acpi_battery *battery;
+
+ if (!dev)
+ return -EINVAL;
+
+ battery = acpi_driver_data(to_acpi_device(dev));
+ if (!battery)
+ return -EINVAL;
+
+ battery->update_time = 0;
+ acpi_battery_update(battery, true);
+ return 0;
+}
+#else
+#define acpi_battery_resume NULL
+#endif
+
+static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
+
+static struct acpi_driver acpi_battery_driver = {
+ .name = "battery",
+ .class = ACPI_BATTERY_CLASS,
+ .ids = battery_device_ids,
+ .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
+ .ops = {
+ .add = acpi_battery_add,
+ .remove = acpi_battery_remove,
+ .notify = acpi_battery_notify,
+ },
+ .drv.pm = &acpi_battery_pm,
+};
+
+static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
+{
+ if (acpi_disabled)
+ return;
+
+ dmi_check_system(bat_dmi_table);
+
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ acpi_battery_dir = acpi_lock_battery_dir();
+ if (!acpi_battery_dir)
+ return;
+#endif
+ if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ acpi_unlock_battery_dir(acpi_battery_dir);
+#endif
+ return;
+ }
+ return;
+}
+
+static int __init acpi_battery_init(void)
+{
+ async_schedule(acpi_battery_init_async, NULL);
+ return 0;
+}
+
+static void __exit acpi_battery_exit(void)
+{
+ acpi_bus_unregister_driver(&acpi_battery_driver);
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ acpi_unlock_battery_dir(acpi_battery_dir);
+#endif
+}
+
+module_init(acpi_battery_init);
+module_exit(acpi_battery_exit);
Code Review / kvmfornfv.git / blobdiff