| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * 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> |
| */ |
| |
| #define pr_fmt(fmt) "ACPI: battery: " fmt |
| |
| #include <linux/async.h> |
| #include <linux/delay.h> |
| #include <linux/dmi.h> |
| #include <linux/jiffies.h> |
| #include <linux/kernel.h> |
| #include <linux/list.h> |
| #include <linux/module.h> |
| #include <linux/mutex.h> |
| #include <linux/slab.h> |
| #include <linux/suspend.h> |
| #include <linux/types.h> |
| |
| #include <asm/unaligned.h> |
| |
| #include <linux/acpi.h> |
| #include <linux/power_supply.h> |
| |
| #include <acpi/battery.h> |
| |
| #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF |
| #define ACPI_BATTERY_CAPACITY_VALID(capacity) \ |
| ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN) |
| |
| #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 |
| |
| MODULE_AUTHOR("Paul Diefenbaugh"); |
| MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); |
| MODULE_DESCRIPTION("ACPI Battery Driver"); |
| MODULE_LICENSE("GPL"); |
| |
| static async_cookie_t async_cookie; |
| static bool battery_driver_registered; |
| static int battery_bix_broken_package; |
| static int battery_notification_delay_ms; |
| static int battery_ac_is_broken; |
| static unsigned int cache_time = 1000; |
| module_param(cache_time, uint, 0644); |
| MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); |
| |
| static const struct acpi_device_id battery_device_ids[] = { |
| {"PNP0C0A", 0}, |
| |
| /* Microsoft Surface Go 3 */ |
| {"MSHW0146", 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, |
| /* for batteries reporting current capacity with design capacity |
| * on a full charge, but showing degradation in full charge cap. |
| */ |
| ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, |
| }; |
| |
| 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; |
| struct list_head list; |
| 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 bool acpi_battery_is_degraded(struct acpi_battery *battery) |
| { |
| return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && |
| ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) && |
| battery->full_charge_capacity < battery->design_capacity; |
| } |
| |
| static int acpi_battery_handle_discharging(struct acpi_battery *battery) |
| { |
| /* |
| * Some devices wrongly report discharging if the battery's charge level |
| * was above the device's start charging threshold atm the AC adapter |
| * was plugged in and the device thus did not start a new charge cycle. |
| */ |
| if ((battery_ac_is_broken || power_supply_is_system_supplied()) && |
| battery->rate_now == 0) |
| return POWER_SUPPLY_STATUS_NOT_CHARGING; |
| |
| return POWER_SUPPLY_STATUS_DISCHARGING; |
| } |
| |
| static int acpi_battery_get_property(struct power_supply *psy, |
| enum power_supply_property psp, |
| union power_supply_propval *val) |
| { |
| int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, 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 = acpi_battery_handle_discharging(battery); |
| 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_NOT_CHARGING; |
| 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 (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) |
| ret = -ENODEV; |
| else |
| val->intval = battery->design_capacity * 1000; |
| break; |
| case POWER_SUPPLY_PROP_CHARGE_FULL: |
| case POWER_SUPPLY_PROP_ENERGY_FULL: |
| if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) |
| 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 (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) |
| full_capacity = battery->full_charge_capacity; |
| else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) |
| full_capacity = battery->design_capacity; |
| |
| if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || |
| full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) |
| ret = -ENODEV; |
| else |
| val->intval = battery->capacity_now * 100/ |
| full_capacity; |
| 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 charge_battery_full_cap_broken_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_NOW, |
| 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, |
| }; |
| |
| static enum power_supply_property energy_battery_full_cap_broken_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_NOW, |
| POWER_SUPPLY_PROP_MODEL_NAME, |
| POWER_SUPPLY_PROP_MANUFACTURER, |
| POWER_SUPPLY_PROP_SERIAL_NUMBER, |
| }; |
| |
| /* Battery Management */ |
| struct acpi_offsets { |
| size_t offset; /* offset inside struct acpi_sbs_battery */ |
| u8 mode; /* int or string? */ |
| }; |
| |
| static const 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 const 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 const 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, |
| const 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_handle_info(battery->device->handle, |
| "_STA evaluation failed\n"); |
| return -ENODEV; |
| } |
| return 0; |
| } |
| |
| |
| static int extract_battery_info(const int use_bix, |
| struct acpi_battery *battery, |
| const struct acpi_buffer *buffer) |
| { |
| int result = -EFAULT; |
| |
| if (use_bix && battery_bix_broken_package) |
| result = extract_package(battery, buffer->pointer, |
| extended_info_offsets + 1, |
| ARRAY_SIZE(extended_info_offsets) - 1); |
| else if (use_bix) |
| 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)); |
| 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. |
| */ |
| } |
| if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && |
| battery->capacity_now > battery->full_charge_capacity) |
| battery->capacity_now = battery->full_charge_capacity; |
| |
| return result; |
| } |
| |
| static int acpi_battery_get_info(struct acpi_battery *battery) |
| { |
| const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); |
| int use_bix; |
| int result = -ENODEV; |
| |
| if (!acpi_battery_present(battery)) |
| return 0; |
| |
| |
| for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { |
| struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| acpi_status status = AE_ERROR; |
| |
| mutex_lock(&battery->lock); |
| status = acpi_evaluate_object(battery->device->handle, |
| use_bix ? "_BIX":"_BIF", |
| NULL, &buffer); |
| mutex_unlock(&battery->lock); |
| |
| if (ACPI_FAILURE(status)) { |
| acpi_handle_info(battery->device->handle, |
| "%s evaluation failed: %s\n", |
| use_bix ? "_BIX":"_BIF", |
| acpi_format_exception(status)); |
| } else { |
| result = extract_battery_info(use_bix, |
| battery, |
| &buffer); |
| |
| kfree(buffer.pointer); |
| break; |
| } |
| } |
| |
| if (!result && !use_bix && xinfo) |
| pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n"); |
| |
| 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_handle_info(battery->device->handle, |
| "_BST evaluation failed: %s", |
| acpi_format_exception(status)); |
| 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); |
| pr_warn_once(FW_BUG "(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; |
| } |
| if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && |
| battery->capacity_now > battery->full_charge_capacity) |
| battery->capacity_now = battery->full_charge_capacity; |
| |
| 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_handle_debug(battery->device->handle, "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 const struct device_attribute alarm_attr = { |
| .attr = {.name = "alarm", .mode = 0644}, |
| .show = acpi_battery_alarm_show, |
| .store = acpi_battery_alarm_store, |
| }; |
| |
| /* |
| * The Battery Hooking API |
| * |
| * This API is used inside other drivers that need to expose |
| * platform-specific behaviour within the generic driver in a |
| * generic way. |
| * |
| */ |
| |
| static LIST_HEAD(acpi_battery_list); |
| static LIST_HEAD(battery_hook_list); |
| static DEFINE_MUTEX(hook_mutex); |
| |
| static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock) |
| { |
| struct acpi_battery *battery; |
| /* |
| * In order to remove a hook, we first need to |
| * de-register all the batteries that are registered. |
| */ |
| if (lock) |
| mutex_lock(&hook_mutex); |
| list_for_each_entry(battery, &acpi_battery_list, list) { |
| if (!hook->remove_battery(battery->bat, hook)) |
| power_supply_changed(battery->bat); |
| } |
| list_del(&hook->list); |
| if (lock) |
| mutex_unlock(&hook_mutex); |
| pr_info("extension unregistered: %s\n", hook->name); |
| } |
| |
| void battery_hook_unregister(struct acpi_battery_hook *hook) |
| { |
| __battery_hook_unregister(hook, 1); |
| } |
| EXPORT_SYMBOL_GPL(battery_hook_unregister); |
| |
| void battery_hook_register(struct acpi_battery_hook *hook) |
| { |
| struct acpi_battery *battery; |
| |
| mutex_lock(&hook_mutex); |
| INIT_LIST_HEAD(&hook->list); |
| list_add(&hook->list, &battery_hook_list); |
| /* |
| * Now that the driver is registered, we need |
| * to notify the hook that a battery is available |
| * for each battery, so that the driver may add |
| * its attributes. |
| */ |
| list_for_each_entry(battery, &acpi_battery_list, list) { |
| if (hook->add_battery(battery->bat, hook)) { |
| /* |
| * If a add-battery returns non-zero, |
| * the registration of the extension has failed, |
| * and we will not add it to the list of loaded |
| * hooks. |
| */ |
| pr_err("extension failed to load: %s", hook->name); |
| __battery_hook_unregister(hook, 0); |
| goto end; |
| } |
| |
| power_supply_changed(battery->bat); |
| } |
| pr_info("new extension: %s\n", hook->name); |
| end: |
| mutex_unlock(&hook_mutex); |
| } |
| EXPORT_SYMBOL_GPL(battery_hook_register); |
| |
| /* |
| * This function gets called right after the battery sysfs |
| * attributes have been added, so that the drivers that |
| * define custom sysfs attributes can add their own. |
| */ |
| static void battery_hook_add_battery(struct acpi_battery *battery) |
| { |
| struct acpi_battery_hook *hook_node, *tmp; |
| |
| mutex_lock(&hook_mutex); |
| INIT_LIST_HEAD(&battery->list); |
| list_add(&battery->list, &acpi_battery_list); |
| /* |
| * Since we added a new battery to the list, we need to |
| * iterate over the hooks and call add_battery for each |
| * hook that was registered. This usually happens |
| * when a battery gets hotplugged or initialized |
| * during the battery module initialization. |
| */ |
| list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { |
| if (hook_node->add_battery(battery->bat, hook_node)) { |
| /* |
| * The notification of the extensions has failed, to |
| * prevent further errors we will unload the extension. |
| */ |
| pr_err("error in extension, unloading: %s", |
| hook_node->name); |
| __battery_hook_unregister(hook_node, 0); |
| } |
| } |
| mutex_unlock(&hook_mutex); |
| } |
| |
| static void battery_hook_remove_battery(struct acpi_battery *battery) |
| { |
| struct acpi_battery_hook *hook; |
| |
| mutex_lock(&hook_mutex); |
| /* |
| * Before removing the hook, we need to remove all |
| * custom attributes from the battery. |
| */ |
| list_for_each_entry(hook, &battery_hook_list, list) { |
| hook->remove_battery(battery->bat, hook); |
| } |
| /* Then, just remove the battery from the list */ |
| list_del(&battery->list); |
| mutex_unlock(&hook_mutex); |
| } |
| |
| static void __exit battery_hook_exit(void) |
| { |
| struct acpi_battery_hook *hook; |
| struct acpi_battery_hook *ptr; |
| /* |
| * At this point, the acpi_bus_unregister_driver() |
| * has called remove for all batteries. We just |
| * need to remove the hooks. |
| */ |
| list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { |
| __battery_hook_unregister(hook, 1); |
| } |
| mutex_destroy(&hook_mutex); |
| } |
| |
| static int sysfs_add_battery(struct acpi_battery *battery) |
| { |
| struct power_supply_config psy_cfg = { .drv_data = battery, }; |
| bool full_cap_broken = false; |
| |
| if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && |
| !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) |
| full_cap_broken = true; |
| |
| if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { |
| if (full_cap_broken) { |
| battery->bat_desc.properties = |
| charge_battery_full_cap_broken_props; |
| battery->bat_desc.num_properties = |
| ARRAY_SIZE(charge_battery_full_cap_broken_props); |
| } else { |
| battery->bat_desc.properties = charge_battery_props; |
| battery->bat_desc.num_properties = |
| ARRAY_SIZE(charge_battery_props); |
| } |
| } else { |
| if (full_cap_broken) { |
| battery->bat_desc.properties = |
| energy_battery_full_cap_broken_props; |
| battery->bat_desc.num_properties = |
| ARRAY_SIZE(energy_battery_full_cap_broken_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; |
| } |
| battery_hook_add_battery(battery); |
| 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; |
| } |
| battery_hook_remove_battery(battery); |
| 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; |
| } |
| } |
| } |
| |
| if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) |
| return; |
| |
| if (acpi_battery_is_degraded(battery) && |
| battery->capacity_now > battery->full_charge_capacity) { |
| set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags); |
| battery->capacity_now = battery->full_charge_capacity; |
| } |
| } |
| |
| static int acpi_battery_update(struct acpi_battery *battery, bool resume) |
| { |
| int 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) { |
| result = acpi_battery_get_info(battery); |
| if (result) |
| return result; |
| acpi_battery_init_alarm(battery); |
| } |
| |
| result = acpi_battery_get_state(battery); |
| if (result) |
| return result; |
| acpi_battery_quirks(battery); |
| |
| if (!battery->bat) { |
| result = sysfs_add_battery(battery); |
| if (result) |
| return result; |
| } |
| |
| /* |
| * 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))) |
| acpi_pm_wakeup_event(&battery->device->dev); |
| |
| 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); |
| } |
| |
| /* 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) { |
| acpi_battery_refresh(battery); |
| } else { |
| result = acpi_battery_get_info(battery); |
| if (result) |
| return result; |
| |
| result = sysfs_add_battery(battery); |
| if (result) |
| return result; |
| } |
| |
| acpi_battery_init_alarm(battery); |
| acpi_battery_get_state(battery); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int __init |
| battery_bix_broken_package_quirk(const struct dmi_system_id *d) |
| { |
| battery_bix_broken_package = 1; |
| return 0; |
| } |
| |
| static int __init |
| battery_notification_delay_quirk(const struct dmi_system_id *d) |
| { |
| battery_notification_delay_ms = 1000; |
| return 0; |
| } |
| |
| static int __init |
| battery_ac_is_broken_quirk(const struct dmi_system_id *d) |
| { |
| battery_ac_is_broken = 1; |
| return 0; |
| } |
| |
| static const struct dmi_system_id bat_dmi_table[] __initconst = { |
| { |
| /* NEC LZ750/LS */ |
| .callback = battery_bix_broken_package_quirk, |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "NEC"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), |
| }, |
| }, |
| { |
| /* Acer Aspire V5-573G */ |
| .callback = battery_notification_delay_quirk, |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), |
| }, |
| }, |
| { |
| /* Point of View mobii wintab p800w */ |
| .callback = battery_ac_is_broken_quirk, |
| .matches = { |
| DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), |
| DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), |
| DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), |
| /* Above matches are too generic, add bios-date match */ |
| DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), |
| }, |
| }, |
| { |
| /* Microsoft Surface Go 3 */ |
| .callback = battery_notification_delay_quirk, |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"), |
| }, |
| }, |
| {}, |
| }; |
| |
| /* |
| * 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; |
| |
| pr_info("Slot [%s] (battery %s)\n", 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 void acpi_battery_remove(struct acpi_device *device) |
| { |
| struct acpi_battery *battery = NULL; |
| |
| if (!device || !acpi_driver_data(device)) |
| return; |
| device_init_wakeup(&device->dev, 0); |
| battery = acpi_driver_data(device); |
| unregister_pm_notifier(&battery->pm_nb); |
| sysfs_remove_battery(battery); |
| mutex_destroy(&battery->lock); |
| mutex_destroy(&battery->sysfs_lock); |
| kfree(battery); |
| } |
| |
| #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) |
| { |
| int result; |
| |
| if (acpi_quirk_skip_acpi_ac_and_battery()) |
| return; |
| |
| dmi_check_system(bat_dmi_table); |
| |
| result = acpi_bus_register_driver(&acpi_battery_driver); |
| battery_driver_registered = (result == 0); |
| } |
| |
| static int __init acpi_battery_init(void) |
| { |
| if (acpi_disabled) |
| return -ENODEV; |
| |
| async_cookie = async_schedule(acpi_battery_init_async, NULL); |
| return 0; |
| } |
| |
| static void __exit acpi_battery_exit(void) |
| { |
| async_synchronize_cookie(async_cookie + 1); |
| if (battery_driver_registered) { |
| acpi_bus_unregister_driver(&acpi_battery_driver); |
| battery_hook_exit(); |
| } |
| } |
| |
| module_init(acpi_battery_init); |
| module_exit(acpi_battery_exit); |