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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * battery.c - ACPI Battery Driver (Revision: 2.0)
- *
- * Copyright (C) 2007 Alexey Starikovskiy <[email protected]>
- * Copyright (C) 2004-2007 Vladimir Lebedev <[email protected]>
- * Copyright (C) 2001, 2002 Andy Grover <[email protected]>
- * Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
- */
- #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 <[email protected]>");
- 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)
- strscpy(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) {
- hook->remove_battery(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)) {
- /*
- * 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;
- }
- }
- 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)) {
- /*
- * 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);
- }
- /* 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 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);
- 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)
- {
- 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);
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