986 lines
40 KiB
C
986 lines
40 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Universal power supply monitor class
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*
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* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
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* Copyright © 2004 Szabolcs Gyurko
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* Copyright © 2003 Ian Molton <spyro@f2s.com>
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*
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* Modified: 2004, Oct Szabolcs Gyurko
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*/
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#ifndef __LINUX_POWER_SUPPLY_H__
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#define __LINUX_POWER_SUPPLY_H__
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#include <linux/device.h>
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#include <linux/workqueue.h>
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#include <linux/leds.h>
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#include <linux/spinlock.h>
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#include <linux/notifier.h>
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/*
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* All voltages, currents, charges, energies, time and temperatures in uV,
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* µA, µAh, µWh, seconds and tenths of degree Celsius unless otherwise
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* stated. It's driver's job to convert its raw values to units in which
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* this class operates.
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*/
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/*
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* For systems where the charger determines the maximum battery capacity
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* the min and max fields should be used to present these values to user
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* space. Unused/unknown fields will not appear in sysfs.
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*/
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enum {
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POWER_SUPPLY_STATUS_UNKNOWN = 0,
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POWER_SUPPLY_STATUS_CHARGING,
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POWER_SUPPLY_STATUS_DISCHARGING,
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POWER_SUPPLY_STATUS_NOT_CHARGING,
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POWER_SUPPLY_STATUS_FULL,
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};
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/* What algorithm is the charger using? */
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enum {
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POWER_SUPPLY_CHARGE_TYPE_UNKNOWN = 0,
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POWER_SUPPLY_CHARGE_TYPE_NONE,
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POWER_SUPPLY_CHARGE_TYPE_TRICKLE, /* slow speed */
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POWER_SUPPLY_CHARGE_TYPE_FAST, /* fast speed */
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POWER_SUPPLY_CHARGE_TYPE_STANDARD, /* normal speed */
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POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE, /* dynamically adjusted speed */
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POWER_SUPPLY_CHARGE_TYPE_CUSTOM, /* use CHARGE_CONTROL_* props */
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POWER_SUPPLY_CHARGE_TYPE_LONGLIFE, /* slow speed, longer life */
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POWER_SUPPLY_CHARGE_TYPE_BYPASS, /* bypassing the charger */
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};
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enum {
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POWER_SUPPLY_HEALTH_UNKNOWN = 0,
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POWER_SUPPLY_HEALTH_GOOD,
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POWER_SUPPLY_HEALTH_OVERHEAT,
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POWER_SUPPLY_HEALTH_DEAD,
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POWER_SUPPLY_HEALTH_OVERVOLTAGE,
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POWER_SUPPLY_HEALTH_UNSPEC_FAILURE,
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POWER_SUPPLY_HEALTH_COLD,
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POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE,
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POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE,
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POWER_SUPPLY_HEALTH_OVERCURRENT,
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POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED,
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POWER_SUPPLY_HEALTH_WARM,
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POWER_SUPPLY_HEALTH_COOL,
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POWER_SUPPLY_HEALTH_HOT,
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POWER_SUPPLY_HEALTH_NO_BATTERY,
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};
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enum {
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POWER_SUPPLY_TECHNOLOGY_UNKNOWN = 0,
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POWER_SUPPLY_TECHNOLOGY_NiMH,
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POWER_SUPPLY_TECHNOLOGY_LION,
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POWER_SUPPLY_TECHNOLOGY_LIPO,
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POWER_SUPPLY_TECHNOLOGY_LiFe,
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POWER_SUPPLY_TECHNOLOGY_NiCd,
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POWER_SUPPLY_TECHNOLOGY_LiMn,
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};
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enum {
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POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN = 0,
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POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL,
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POWER_SUPPLY_CAPACITY_LEVEL_LOW,
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POWER_SUPPLY_CAPACITY_LEVEL_NORMAL,
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POWER_SUPPLY_CAPACITY_LEVEL_HIGH,
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POWER_SUPPLY_CAPACITY_LEVEL_FULL,
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};
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enum {
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POWER_SUPPLY_SCOPE_UNKNOWN = 0,
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POWER_SUPPLY_SCOPE_SYSTEM,
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POWER_SUPPLY_SCOPE_DEVICE,
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};
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enum power_supply_property {
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/* Properties of type `int' */
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POWER_SUPPLY_PROP_STATUS = 0,
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POWER_SUPPLY_PROP_CHARGE_TYPE,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_AUTHENTIC,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CYCLE_COUNT,
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POWER_SUPPLY_PROP_VOLTAGE_MAX,
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POWER_SUPPLY_PROP_VOLTAGE_MIN,
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POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_AVG,
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POWER_SUPPLY_PROP_VOLTAGE_OCV,
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POWER_SUPPLY_PROP_VOLTAGE_BOOT,
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POWER_SUPPLY_PROP_CURRENT_MAX,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CURRENT_AVG,
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POWER_SUPPLY_PROP_CURRENT_BOOT,
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POWER_SUPPLY_PROP_POWER_NOW,
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POWER_SUPPLY_PROP_POWER_AVG,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_EMPTY,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_CHARGE_AVG,
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POWER_SUPPLY_PROP_CHARGE_COUNTER,
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POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
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POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
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POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
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POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
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POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
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POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX,
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POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD, /* in percents! */
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POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD, /* in percents! */
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POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR,
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POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
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POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
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POWER_SUPPLY_PROP_INPUT_POWER_LIMIT,
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POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
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POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN,
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POWER_SUPPLY_PROP_ENERGY_FULL,
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POWER_SUPPLY_PROP_ENERGY_EMPTY,
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POWER_SUPPLY_PROP_ENERGY_NOW,
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POWER_SUPPLY_PROP_ENERGY_AVG,
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POWER_SUPPLY_PROP_CAPACITY, /* in percents! */
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POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN, /* in percents! */
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POWER_SUPPLY_PROP_CAPACITY_ALERT_MAX, /* in percents! */
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POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN, /* in percents! */
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POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TEMP_MAX,
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POWER_SUPPLY_PROP_TEMP_MIN,
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POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
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POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
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POWER_SUPPLY_PROP_TEMP_AMBIENT,
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POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN,
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POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
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POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
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POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
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POWER_SUPPLY_PROP_TYPE, /* use power_supply.type instead */
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POWER_SUPPLY_PROP_USB_TYPE,
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POWER_SUPPLY_PROP_SCOPE,
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POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
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POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
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POWER_SUPPLY_PROP_CALIBRATE,
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POWER_SUPPLY_PROP_MANUFACTURE_YEAR,
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POWER_SUPPLY_PROP_MANUFACTURE_MONTH,
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POWER_SUPPLY_PROP_MANUFACTURE_DAY,
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/* Properties of type `const char *' */
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POWER_SUPPLY_PROP_MODEL_NAME,
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POWER_SUPPLY_PROP_MANUFACTURER,
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POWER_SUPPLY_PROP_SERIAL_NUMBER,
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};
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enum power_supply_type {
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POWER_SUPPLY_TYPE_UNKNOWN = 0,
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POWER_SUPPLY_TYPE_BATTERY,
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POWER_SUPPLY_TYPE_UPS,
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POWER_SUPPLY_TYPE_MAINS,
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POWER_SUPPLY_TYPE_USB, /* Standard Downstream Port */
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POWER_SUPPLY_TYPE_USB_DCP, /* Dedicated Charging Port */
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POWER_SUPPLY_TYPE_USB_CDP, /* Charging Downstream Port */
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POWER_SUPPLY_TYPE_USB_ACA, /* Accessory Charger Adapters */
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POWER_SUPPLY_TYPE_USB_TYPE_C, /* Type C Port */
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POWER_SUPPLY_TYPE_USB_PD, /* Power Delivery Port */
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POWER_SUPPLY_TYPE_USB_PD_DRP, /* PD Dual Role Port */
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POWER_SUPPLY_TYPE_APPLE_BRICK_ID, /* Apple Charging Method */
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POWER_SUPPLY_TYPE_WIRELESS, /* Wireless */
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};
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enum power_supply_usb_type {
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POWER_SUPPLY_USB_TYPE_UNKNOWN = 0,
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POWER_SUPPLY_USB_TYPE_SDP, /* Standard Downstream Port */
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POWER_SUPPLY_USB_TYPE_DCP, /* Dedicated Charging Port */
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POWER_SUPPLY_USB_TYPE_CDP, /* Charging Downstream Port */
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POWER_SUPPLY_USB_TYPE_ACA, /* Accessory Charger Adapters */
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POWER_SUPPLY_USB_TYPE_C, /* Type C Port */
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POWER_SUPPLY_USB_TYPE_PD, /* Power Delivery Port */
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POWER_SUPPLY_USB_TYPE_PD_DRP, /* PD Dual Role Port */
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POWER_SUPPLY_USB_TYPE_PD_PPS, /* PD Programmable Power Supply */
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POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID, /* Apple Charging Method */
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};
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enum power_supply_charge_behaviour {
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POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO = 0,
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POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE,
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POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE,
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};
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enum power_supply_notifier_events {
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PSY_EVENT_PROP_CHANGED,
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};
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union power_supply_propval {
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int intval;
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const char *strval;
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};
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struct device_node;
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struct power_supply;
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/* Run-time specific power supply configuration */
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struct power_supply_config {
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struct device_node *of_node;
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struct fwnode_handle *fwnode;
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/* Driver private data */
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void *drv_data;
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/* Device specific sysfs attributes */
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const struct attribute_group **attr_grp;
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char **supplied_to;
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size_t num_supplicants;
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};
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/* Description of power supply */
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struct power_supply_desc {
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const char *name;
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enum power_supply_type type;
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u8 charge_behaviours;
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u32 usb_types;
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const enum power_supply_property *properties;
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size_t num_properties;
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/*
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* Functions for drivers implementing power supply class.
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* These shouldn't be called directly by other drivers for accessing
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* this power supply. Instead use power_supply_*() functions (for
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* example power_supply_get_property()).
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*/
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int (*get_property)(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val);
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int (*set_property)(struct power_supply *psy,
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enum power_supply_property psp,
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const union power_supply_propval *val);
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/*
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* property_is_writeable() will be called during registration
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* of power supply. If this happens during device probe then it must
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* not access internal data of device (because probe did not end).
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*/
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int (*property_is_writeable)(struct power_supply *psy,
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enum power_supply_property psp);
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void (*external_power_changed)(struct power_supply *psy);
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void (*set_charged)(struct power_supply *psy);
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/*
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* Set if thermal zone should not be created for this power supply.
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* For example for virtual supplies forwarding calls to actual
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* sensors or other supplies.
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*/
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bool no_thermal;
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/* For APM emulation, think legacy userspace. */
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int use_for_apm;
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};
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struct power_supply {
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const struct power_supply_desc *desc;
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char **supplied_to;
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size_t num_supplicants;
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char **supplied_from;
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size_t num_supplies;
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struct device_node *of_node;
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/* Driver private data */
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void *drv_data;
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/* private */
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struct device dev;
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struct work_struct changed_work;
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struct delayed_work deferred_register_work;
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spinlock_t changed_lock;
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bool changed;
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bool initialized;
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bool removing;
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atomic_t use_cnt;
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struct power_supply_battery_info *battery_info;
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#ifdef CONFIG_THERMAL
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struct thermal_zone_device *tzd;
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struct thermal_cooling_device *tcd;
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#endif
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#ifdef CONFIG_LEDS_TRIGGERS
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struct led_trigger *trig;
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struct led_trigger *charging_trig;
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struct led_trigger *full_trig;
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struct led_trigger *charging_blink_full_solid_trig;
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struct led_trigger *charging_orange_full_green_trig;
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#endif
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};
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/*
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* This is recommended structure to specify static power supply parameters.
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* Generic one, parametrizable for different power supplies. Power supply
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* class itself does not use it, but that's what implementing most platform
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* drivers, should try reuse for consistency.
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*/
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struct power_supply_info {
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const char *name;
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int technology;
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int voltage_max_design;
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int voltage_min_design;
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int charge_full_design;
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int charge_empty_design;
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int energy_full_design;
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int energy_empty_design;
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int use_for_apm;
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};
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struct power_supply_battery_ocv_table {
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int ocv; /* microVolts */
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int capacity; /* percent */
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};
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struct power_supply_resistance_temp_table {
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int temp; /* celsius */
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int resistance; /* internal resistance percent */
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};
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struct power_supply_vbat_ri_table {
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int vbat_uv; /* Battery voltage in microvolt */
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int ri_uohm; /* Internal resistance in microohm */
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};
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/**
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* struct power_supply_maintenance_charge_table - setting for maintenace charging
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* @charge_current_max_ua: maintenance charging current that is used to keep
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* the charge of the battery full as current is consumed after full charging.
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* The corresponding charge_voltage_max_uv is used as a safeguard: when we
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* reach this voltage the maintenance charging current is turned off. It is
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* turned back on if we fall below this voltage.
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* @charge_voltage_max_uv: maintenance charging voltage that is usually a bit
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* lower than the constant_charge_voltage_max_uv. We can apply this settings
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* charge_current_max_ua until we get back up to this voltage.
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* @safety_timer_minutes: maintenance charging safety timer, with an expiry
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* time in minutes. We will only use maintenance charging in this setting
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* for a certain amount of time, then we will first move to the next
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* maintenance charge current and voltage pair in respective array and wait
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* for the next safety timer timeout, or, if we reached the last maintencance
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* charging setting, disable charging until we reach
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* charge_restart_voltage_uv and restart ordinary CC/CV charging from there.
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* These timers should be chosen to align with the typical discharge curve
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* for the battery.
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*
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* Ordinary CC/CV charging will stop charging when the charge current goes
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* below charge_term_current_ua, and then restart it (if the device is still
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* plugged into the charger) at charge_restart_voltage_uv. This happens in most
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* consumer products because the power usage while connected to a charger is
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* not zero, and devices are not manufactured to draw power directly from the
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* charger: instead they will at all times dissipate the battery a little, like
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* the power used in standby mode. This will over time give a charge graph
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* such as this:
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*
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* Energy
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* ^ ... ... ... ... ... ... ...
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* | . . . . . . . . . . . . .
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* | .. . .. . .. . .. . .. . .. . ..
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* |. .. .. .. .. .. ..
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* +-------------------------------------------------------------------> t
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*
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* Practically this means that the Li-ions are wandering back and forth in the
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* battery and this causes degeneration of the battery anode and cathode.
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* To prolong the life of the battery, maintenance charging is applied after
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* reaching charge_term_current_ua to hold up the charge in the battery while
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* consuming power, thus lowering the wear on the battery:
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*
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* Energy
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* ^ .......................................
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* | . ......................
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* | ..
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* |.
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* +-------------------------------------------------------------------> t
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*
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* Maintenance charging uses the voltages from this table: a table of settings
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* is traversed using a slightly lower current and voltage than what is used for
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* CC/CV charging. The maintenance charging will for safety reasons not go on
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* indefinately: we lower the current and voltage with successive maintenance
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* settings, then disable charging completely after we reach the last one,
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* and after that we do not restart charging until we reach
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* charge_restart_voltage_uv (see struct power_supply_battery_info) and restart
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* ordinary CC/CV charging from there.
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*
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* As an example, a Samsung EB425161LA Lithium-Ion battery is CC/CV charged
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* at 900mA to 4340mV, then maintenance charged at 600mA and 4150mV for up to
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* 60 hours, then maintenance charged at 600mA and 4100mV for up to 200 hours.
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* After this the charge cycle is restarted waiting for
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* charge_restart_voltage_uv.
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*
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* For most mobile electronics this type of maintenance charging is enough for
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* the user to disconnect the device and make use of it before both maintenance
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* charging cycles are complete, if the current and voltage has been chosen
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* appropriately. These need to be determined from battery discharge curves
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* and expected standby current.
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*
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* If the voltage anyway drops to charge_restart_voltage_uv during maintenance
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* charging, ordinary CC/CV charging is restarted. This can happen if the
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* device is e.g. actively used during charging, so more current is drawn than
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* the expected stand-by current. Also overvoltage protection will be applied
|
|
* as usual.
|
|
*/
|
|
struct power_supply_maintenance_charge_table {
|
|
int charge_current_max_ua;
|
|
int charge_voltage_max_uv;
|
|
int charge_safety_timer_minutes;
|
|
};
|
|
|
|
#define POWER_SUPPLY_OCV_TEMP_MAX 20
|
|
|
|
/**
|
|
* struct power_supply_battery_info - information about batteries
|
|
* @technology: from the POWER_SUPPLY_TECHNOLOGY_* enum
|
|
* @energy_full_design_uwh: energy content when fully charged in microwatt
|
|
* hours
|
|
* @charge_full_design_uah: charge content when fully charged in microampere
|
|
* hours
|
|
* @voltage_min_design_uv: minimum voltage across the poles when the battery
|
|
* is at minimum voltage level in microvolts. If the voltage drops below this
|
|
* level the battery will need precharging when using CC/CV charging.
|
|
* @voltage_max_design_uv: voltage across the poles when the battery is fully
|
|
* charged in microvolts. This is the "nominal voltage" i.e. the voltage
|
|
* printed on the label of the battery.
|
|
* @tricklecharge_current_ua: the tricklecharge current used when trickle
|
|
* charging the battery in microamperes. This is the charging phase when the
|
|
* battery is completely empty and we need to carefully trickle in some
|
|
* charge until we reach the precharging voltage.
|
|
* @precharge_current_ua: current to use in the precharge phase in microamperes,
|
|
* the precharge rate is limited by limiting the current to this value.
|
|
* @precharge_voltage_max_uv: the maximum voltage allowed when precharging in
|
|
* microvolts. When we pass this voltage we will nominally switch over to the
|
|
* CC (constant current) charging phase defined by constant_charge_current_ua
|
|
* and constant_charge_voltage_max_uv.
|
|
* @charge_term_current_ua: when the current in the CV (constant voltage)
|
|
* charging phase drops below this value in microamperes the charging will
|
|
* terminate completely and not restart until the voltage over the battery
|
|
* poles reach charge_restart_voltage_uv unless we use maintenance charging.
|
|
* @charge_restart_voltage_uv: when the battery has been fully charged by
|
|
* CC/CV charging and charging has been disabled, and the voltage subsequently
|
|
* drops below this value in microvolts, the charging will be restarted
|
|
* (typically using CV charging).
|
|
* @overvoltage_limit_uv: If the voltage exceeds the nominal voltage
|
|
* voltage_max_design_uv and we reach this voltage level, all charging must
|
|
* stop and emergency procedures take place, such as shutting down the system
|
|
* in some cases.
|
|
* @constant_charge_current_max_ua: current in microamperes to use in the CC
|
|
* (constant current) charging phase. The charging rate is limited
|
|
* by this current. This is the main charging phase and as the current is
|
|
* constant into the battery the voltage slowly ascends to
|
|
* constant_charge_voltage_max_uv.
|
|
* @constant_charge_voltage_max_uv: voltage in microvolts signifying the end of
|
|
* the CC (constant current) charging phase and the beginning of the CV
|
|
* (constant voltage) charging phase.
|
|
* @maintenance_charge: an array of maintenance charging settings to be used
|
|
* after the main CC/CV charging phase is complete.
|
|
* @maintenance_charge_size: the number of maintenance charging settings in
|
|
* maintenance_charge.
|
|
* @alert_low_temp_charge_current_ua: The charging current to use if the battery
|
|
* enters low alert temperature, i.e. if the internal temperature is between
|
|
* temp_alert_min and temp_min. No matter the charging phase, this
|
|
* and alert_high_temp_charge_voltage_uv will be applied.
|
|
* @alert_low_temp_charge_voltage_uv: Same as alert_low_temp_charge_current_ua,
|
|
* but for the charging voltage.
|
|
* @alert_high_temp_charge_current_ua: The charging current to use if the
|
|
* battery enters high alert temperature, i.e. if the internal temperature is
|
|
* between temp_alert_max and temp_max. No matter the charging phase, this
|
|
* and alert_high_temp_charge_voltage_uv will be applied, usually lowering
|
|
* the charging current as an evasive manouver.
|
|
* @alert_high_temp_charge_voltage_uv: Same as
|
|
* alert_high_temp_charge_current_ua, but for the charging voltage.
|
|
* @factory_internal_resistance_uohm: the internal resistance of the battery
|
|
* at fabrication time, expressed in microohms. This resistance will vary
|
|
* depending on the lifetime and charge of the battery, so this is just a
|
|
* nominal ballpark figure. This internal resistance is given for the state
|
|
* when the battery is discharging.
|
|
* @factory_internal_resistance_charging_uohm: the internal resistance of the
|
|
* battery at fabrication time while charging, expressed in microohms.
|
|
* The charging process will affect the internal resistance of the battery
|
|
* so this value provides a better resistance under these circumstances.
|
|
* This resistance will vary depending on the lifetime and charge of the
|
|
* battery, so this is just a nominal ballpark figure.
|
|
* @ocv_temp: array indicating the open circuit voltage (OCV) capacity
|
|
* temperature indices. This is an array of temperatures in degrees Celsius
|
|
* indicating which capacity table to use for a certain temperature, since
|
|
* the capacity for reasons of chemistry will be different at different
|
|
* temperatures. Determining capacity is a multivariate problem and the
|
|
* temperature is the first variable we determine.
|
|
* @temp_ambient_alert_min: the battery will go outside of operating conditions
|
|
* when the ambient temperature goes below this temperature in degrees
|
|
* Celsius.
|
|
* @temp_ambient_alert_max: the battery will go outside of operating conditions
|
|
* when the ambient temperature goes above this temperature in degrees
|
|
* Celsius.
|
|
* @temp_alert_min: the battery should issue an alert if the internal
|
|
* temperature goes below this temperature in degrees Celsius.
|
|
* @temp_alert_max: the battery should issue an alert if the internal
|
|
* temperature goes above this temperature in degrees Celsius.
|
|
* @temp_min: the battery will go outside of operating conditions when
|
|
* the internal temperature goes below this temperature in degrees Celsius.
|
|
* Normally this means the system should shut down.
|
|
* @temp_max: the battery will go outside of operating conditions when
|
|
* the internal temperature goes above this temperature in degrees Celsius.
|
|
* Normally this means the system should shut down.
|
|
* @ocv_table: for each entry in ocv_temp there is a corresponding entry in
|
|
* ocv_table and a size for each entry in ocv_table_size. These arrays
|
|
* determine the capacity in percent in relation to the voltage in microvolts
|
|
* at the indexed temperature.
|
|
* @ocv_table_size: for each entry in ocv_temp this array is giving the size of
|
|
* each entry in the array of capacity arrays in ocv_table.
|
|
* @resist_table: this is a table that correlates a battery temperature to the
|
|
* expected internal resistance at this temperature. The resistance is given
|
|
* as a percentage of factory_internal_resistance_uohm. Knowing the
|
|
* resistance of the battery is usually necessary for calculating the open
|
|
* circuit voltage (OCV) that is then used with the ocv_table to calculate
|
|
* the capacity of the battery. The resist_table must be ordered descending
|
|
* by temperature: highest temperature with lowest resistance first, lowest
|
|
* temperature with highest resistance last.
|
|
* @resist_table_size: the number of items in the resist_table.
|
|
* @vbat2ri_discharging: this is a table that correlates Battery voltage (VBAT)
|
|
* to internal resistance (Ri). The resistance is given in microohm for the
|
|
* corresponding voltage in microvolts. The internal resistance is used to
|
|
* determine the open circuit voltage so that we can determine the capacity
|
|
* of the battery. These voltages to resistance tables apply when the battery
|
|
* is discharging. The table must be ordered descending by voltage: highest
|
|
* voltage first.
|
|
* @vbat2ri_discharging_size: the number of items in the vbat2ri_discharging
|
|
* table.
|
|
* @vbat2ri_charging: same function as vbat2ri_discharging but for the state
|
|
* when the battery is charging. Being under charge changes the battery's
|
|
* internal resistance characteristics so a separate table is needed.*
|
|
* The table must be ordered descending by voltage: highest voltage first.
|
|
* @vbat2ri_charging_size: the number of items in the vbat2ri_charging
|
|
* table.
|
|
* @bti_resistance_ohm: The Battery Type Indicator (BIT) nominal resistance
|
|
* in ohms for this battery, if an identification resistor is mounted
|
|
* between a third battery terminal and ground. This scheme is used by a lot
|
|
* of mobile device batteries.
|
|
* @bti_resistance_tolerance: The tolerance in percent of the BTI resistance,
|
|
* for example 10 for +/- 10%, if the bti_resistance is set to 7000 and the
|
|
* tolerance is 10% we will detect a proper battery if the BTI resistance
|
|
* is between 6300 and 7700 Ohm.
|
|
*
|
|
* This is the recommended struct to manage static battery parameters,
|
|
* populated by power_supply_get_battery_info(). Most platform drivers should
|
|
* use these for consistency.
|
|
*
|
|
* Its field names must correspond to elements in enum power_supply_property.
|
|
* The default field value is -EINVAL or NULL for pointers.
|
|
*
|
|
* CC/CV CHARGING:
|
|
*
|
|
* The charging parameters here assume a CC/CV charging scheme. This method
|
|
* is most common with Lithium Ion batteries (other methods are possible) and
|
|
* looks as follows:
|
|
*
|
|
* ^ Battery voltage
|
|
* | --- overvoltage_limit_uv
|
|
* |
|
|
* | ...................................................
|
|
* | .. constant_charge_voltage_max_uv
|
|
* | ..
|
|
* | .
|
|
* | .
|
|
* | .
|
|
* | .
|
|
* | .
|
|
* | .. precharge_voltage_max_uv
|
|
* | ..
|
|
* |. (trickle charging)
|
|
* +------------------------------------------------------------------> time
|
|
*
|
|
* ^ Current into the battery
|
|
* |
|
|
* | ............. constant_charge_current_max_ua
|
|
* | . .
|
|
* | . .
|
|
* | . .
|
|
* | . .
|
|
* | . ..
|
|
* | . ....
|
|
* | . .....
|
|
* | ... precharge_current_ua ....... charge_term_current_ua
|
|
* | . .
|
|
* | . .
|
|
* |.... tricklecharge_current_ua .
|
|
* | .
|
|
* +-----------------------------------------------------------------> time
|
|
*
|
|
* These diagrams are synchronized on time and the voltage and current
|
|
* follow each other.
|
|
*
|
|
* With CC/CV charging commence over time like this for an empty battery:
|
|
*
|
|
* 1. When the battery is completely empty it may need to be charged with
|
|
* an especially small current so that electrons just "trickle in",
|
|
* this is the tricklecharge_current_ua.
|
|
*
|
|
* 2. Next a small initial pre-charge current (precharge_current_ua)
|
|
* is applied if the voltage is below precharge_voltage_max_uv until we
|
|
* reach precharge_voltage_max_uv. CAUTION: in some texts this is referred
|
|
* to as "trickle charging" but the use in the Linux kernel is different
|
|
* see below!
|
|
*
|
|
* 3. Then the main charging current is applied, which is called the constant
|
|
* current (CC) phase. A current regulator is set up to allow
|
|
* constant_charge_current_max_ua of current to flow into the battery.
|
|
* The chemical reaction in the battery will make the voltage go up as
|
|
* charge goes into the battery. This current is applied until we reach
|
|
* the constant_charge_voltage_max_uv voltage.
|
|
*
|
|
* 4. At this voltage we switch over to the constant voltage (CV) phase. This
|
|
* means we allow current to go into the battery, but we keep the voltage
|
|
* fixed. This current will continue to charge the battery while keeping
|
|
* the voltage the same. A chemical reaction in the battery goes on
|
|
* storing energy without affecting the voltage. Over time the current
|
|
* will slowly drop and when we reach charge_term_current_ua we will
|
|
* end the constant voltage phase.
|
|
*
|
|
* After this the battery is fully charged, and if we do not support maintenance
|
|
* charging, the charging will not restart until power dissipation makes the
|
|
* voltage fall so that we reach charge_restart_voltage_uv and at this point
|
|
* we restart charging at the appropriate phase, usually this will be inside
|
|
* the CV phase.
|
|
*
|
|
* If we support maintenance charging the voltage is however kept high after
|
|
* the CV phase with a very low current. This is meant to let the same charge
|
|
* go in for usage while the charger is still connected, mainly for
|
|
* dissipation for the power consuming entity while connected to the
|
|
* charger.
|
|
*
|
|
* All charging MUST terminate if the overvoltage_limit_uv is ever reached.
|
|
* Overcharging Lithium Ion cells can be DANGEROUS and lead to fire or
|
|
* explosions.
|
|
*
|
|
* DETERMINING BATTERY CAPACITY:
|
|
*
|
|
* Several members of the struct deal with trying to determine the remaining
|
|
* capacity in the battery, usually as a percentage of charge. In practice
|
|
* many chargers uses a so-called fuel gauge or coloumb counter that measure
|
|
* how much charge goes into the battery and how much goes out (+/- leak
|
|
* consumption). This does not help if we do not know how much capacity the
|
|
* battery has to begin with, such as when it is first used or was taken out
|
|
* and charged in a separate charger. Therefore many capacity algorithms use
|
|
* the open circuit voltage with a look-up table to determine the rough
|
|
* capacity of the battery. The open circuit voltage can be conceptualized
|
|
* with an ideal voltage source (V) in series with an internal resistance (Ri)
|
|
* like this:
|
|
*
|
|
* +-------> IBAT >----------------+
|
|
* | ^ |
|
|
* [ ] Ri | |
|
|
* | | VBAT |
|
|
* o <---------- | |
|
|
* +| ^ | [ ] Rload
|
|
* .---. | | |
|
|
* | V | | OCV | |
|
|
* '---' | | |
|
|
* | | | |
|
|
* GND +-------------------------------+
|
|
*
|
|
* If we disconnect the load (here simplified as a fixed resistance Rload)
|
|
* and measure VBAT with a infinite impedance voltage meter we will get
|
|
* VBAT = OCV and this assumption is sometimes made even under load, assuming
|
|
* Rload is insignificant. However this will be of dubious quality because the
|
|
* load is rarely that small and Ri is strongly nonlinear depending on
|
|
* temperature and how much capacity is left in the battery due to the
|
|
* chemistry involved.
|
|
*
|
|
* In many practical applications we cannot just disconnect the battery from
|
|
* the load, so instead we often try to measure the instantaneous IBAT (the
|
|
* current out from the battery), estimate the Ri and thus calculate the
|
|
* voltage drop over Ri and compensate like this:
|
|
*
|
|
* OCV = VBAT - (IBAT * Ri)
|
|
*
|
|
* The tables vbat2ri_discharging and vbat2ri_charging are used to determine
|
|
* (by interpolation) the Ri from the VBAT under load. These curves are highly
|
|
* nonlinear and may need many datapoints but can be found in datasheets for
|
|
* some batteries. This gives the compensated open circuit voltage (OCV) for
|
|
* the battery even under load. Using this method will also compensate for
|
|
* temperature changes in the environment: this will also make the internal
|
|
* resistance change, and it will affect the VBAT under load, so correlating
|
|
* VBAT to Ri takes both remaining capacity and temperature into consideration.
|
|
*
|
|
* Alternatively a manufacturer can specify how the capacity of the battery
|
|
* is dependent on the battery temperature which is the main factor affecting
|
|
* Ri. As we know all checmical reactions are faster when it is warm and slower
|
|
* when it is cold. You can put in 1500mAh and only get 800mAh out before the
|
|
* voltage drops too low for example. This effect is also highly nonlinear and
|
|
* the purpose of the table resist_table: this will take a temperature and
|
|
* tell us how big percentage of Ri the specified temperature correlates to.
|
|
* Usually we have 100% of the factory_internal_resistance_uohm at 25 degrees
|
|
* Celsius.
|
|
*
|
|
* The power supply class itself doesn't use this struct as of now.
|
|
*/
|
|
|
|
struct power_supply_battery_info {
|
|
unsigned int technology;
|
|
int energy_full_design_uwh;
|
|
int charge_full_design_uah;
|
|
int voltage_min_design_uv;
|
|
int voltage_max_design_uv;
|
|
int tricklecharge_current_ua;
|
|
int precharge_current_ua;
|
|
int precharge_voltage_max_uv;
|
|
int charge_term_current_ua;
|
|
int charge_restart_voltage_uv;
|
|
int overvoltage_limit_uv;
|
|
int constant_charge_current_max_ua;
|
|
int constant_charge_voltage_max_uv;
|
|
const struct power_supply_maintenance_charge_table *maintenance_charge;
|
|
int maintenance_charge_size;
|
|
int alert_low_temp_charge_current_ua;
|
|
int alert_low_temp_charge_voltage_uv;
|
|
int alert_high_temp_charge_current_ua;
|
|
int alert_high_temp_charge_voltage_uv;
|
|
int factory_internal_resistance_uohm;
|
|
int factory_internal_resistance_charging_uohm;
|
|
int ocv_temp[POWER_SUPPLY_OCV_TEMP_MAX];
|
|
int temp_ambient_alert_min;
|
|
int temp_ambient_alert_max;
|
|
int temp_alert_min;
|
|
int temp_alert_max;
|
|
int temp_min;
|
|
int temp_max;
|
|
struct power_supply_battery_ocv_table *ocv_table[POWER_SUPPLY_OCV_TEMP_MAX];
|
|
int ocv_table_size[POWER_SUPPLY_OCV_TEMP_MAX];
|
|
struct power_supply_resistance_temp_table *resist_table;
|
|
int resist_table_size;
|
|
const struct power_supply_vbat_ri_table *vbat2ri_discharging;
|
|
int vbat2ri_discharging_size;
|
|
const struct power_supply_vbat_ri_table *vbat2ri_charging;
|
|
int vbat2ri_charging_size;
|
|
int bti_resistance_ohm;
|
|
int bti_resistance_tolerance;
|
|
};
|
|
|
|
extern int power_supply_reg_notifier(struct notifier_block *nb);
|
|
extern void power_supply_unreg_notifier(struct notifier_block *nb);
|
|
#if IS_ENABLED(CONFIG_POWER_SUPPLY)
|
|
extern struct power_supply *power_supply_get_by_name(const char *name);
|
|
extern void power_supply_put(struct power_supply *psy);
|
|
#else
|
|
static inline void power_supply_put(struct power_supply *psy) {}
|
|
static inline struct power_supply *power_supply_get_by_name(const char *name)
|
|
{ return NULL; }
|
|
#endif
|
|
#ifdef CONFIG_OF
|
|
extern struct power_supply *power_supply_get_by_phandle(struct device_node *np,
|
|
const char *property);
|
|
extern struct power_supply *devm_power_supply_get_by_phandle(
|
|
struct device *dev, const char *property);
|
|
#else /* !CONFIG_OF */
|
|
static inline struct power_supply *
|
|
power_supply_get_by_phandle(struct device_node *np, const char *property)
|
|
{ return NULL; }
|
|
static inline struct power_supply *
|
|
devm_power_supply_get_by_phandle(struct device *dev, const char *property)
|
|
{ return NULL; }
|
|
#endif /* CONFIG_OF */
|
|
|
|
extern const enum power_supply_property power_supply_battery_info_properties[];
|
|
extern const size_t power_supply_battery_info_properties_size;
|
|
extern int power_supply_get_battery_info(struct power_supply *psy,
|
|
struct power_supply_battery_info **info_out);
|
|
extern void power_supply_put_battery_info(struct power_supply *psy,
|
|
struct power_supply_battery_info *info);
|
|
extern bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
|
|
enum power_supply_property psp);
|
|
extern int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val);
|
|
extern int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
|
|
int table_len, int ocv);
|
|
extern struct power_supply_battery_ocv_table *
|
|
power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
|
|
int temp, int *table_len);
|
|
extern int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
|
|
int ocv, int temp);
|
|
extern int
|
|
power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
|
|
int table_len, int temp);
|
|
extern int power_supply_vbat2ri(struct power_supply_battery_info *info,
|
|
int vbat_uv, bool charging);
|
|
extern const struct power_supply_maintenance_charge_table *
|
|
power_supply_get_maintenance_charging_setting(struct power_supply_battery_info *info, int index);
|
|
extern bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
|
|
int resistance);
|
|
extern void power_supply_changed(struct power_supply *psy);
|
|
extern int power_supply_am_i_supplied(struct power_supply *psy);
|
|
int power_supply_get_property_from_supplier(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val);
|
|
extern int power_supply_set_battery_charged(struct power_supply *psy);
|
|
|
|
static inline bool
|
|
power_supply_supports_maintenance_charging(struct power_supply_battery_info *info)
|
|
{
|
|
const struct power_supply_maintenance_charge_table *mt;
|
|
|
|
mt = power_supply_get_maintenance_charging_setting(info, 0);
|
|
|
|
return (mt != NULL);
|
|
}
|
|
|
|
static inline bool
|
|
power_supply_supports_vbat2ri(struct power_supply_battery_info *info)
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|
{
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return ((info->vbat2ri_discharging != NULL) &&
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|
info->vbat2ri_discharging_size > 0);
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}
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|
|
|
static inline bool
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|
power_supply_supports_temp2ri(struct power_supply_battery_info *info)
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|
{
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return ((info->resist_table != NULL) &&
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|
info->resist_table_size > 0);
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|
}
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|
|
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#ifdef CONFIG_POWER_SUPPLY
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extern int power_supply_is_system_supplied(void);
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#else
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static inline int power_supply_is_system_supplied(void) { return -ENOSYS; }
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#endif
|
|
|
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extern int power_supply_get_property(struct power_supply *psy,
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|
enum power_supply_property psp,
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union power_supply_propval *val);
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#if IS_ENABLED(CONFIG_POWER_SUPPLY)
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extern int power_supply_set_property(struct power_supply *psy,
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|
enum power_supply_property psp,
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|
const union power_supply_propval *val);
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|
#else
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|
static inline int power_supply_set_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
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|
const union power_supply_propval *val)
|
|
{ return 0; }
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|
#endif
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extern int power_supply_property_is_writeable(struct power_supply *psy,
|
|
enum power_supply_property psp);
|
|
extern void power_supply_external_power_changed(struct power_supply *psy);
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|
|
|
extern struct power_supply *__must_check
|
|
power_supply_register(struct device *parent,
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|
const struct power_supply_desc *desc,
|
|
const struct power_supply_config *cfg);
|
|
extern struct power_supply *__must_check
|
|
power_supply_register_no_ws(struct device *parent,
|
|
const struct power_supply_desc *desc,
|
|
const struct power_supply_config *cfg);
|
|
extern struct power_supply *__must_check
|
|
devm_power_supply_register(struct device *parent,
|
|
const struct power_supply_desc *desc,
|
|
const struct power_supply_config *cfg);
|
|
extern struct power_supply *__must_check
|
|
devm_power_supply_register_no_ws(struct device *parent,
|
|
const struct power_supply_desc *desc,
|
|
const struct power_supply_config *cfg);
|
|
extern void power_supply_unregister(struct power_supply *psy);
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|
extern int power_supply_powers(struct power_supply *psy, struct device *dev);
|
|
|
|
#define to_power_supply(device) container_of(device, struct power_supply, dev)
|
|
|
|
extern void *power_supply_get_drvdata(struct power_supply *psy);
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|
extern int power_supply_for_each_device(void *data, int (*fn)(struct device *dev, void *data));
|
|
|
|
static inline bool power_supply_is_amp_property(enum power_supply_property psp)
|
|
{
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|
switch (psp) {
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|
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
|
|
case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
|
case POWER_SUPPLY_PROP_CHARGE_EMPTY:
|
|
case POWER_SUPPLY_PROP_CHARGE_NOW:
|
|
case POWER_SUPPLY_PROP_CHARGE_AVG:
|
|
case POWER_SUPPLY_PROP_CHARGE_COUNTER:
|
|
case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
|
|
case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
|
|
case POWER_SUPPLY_PROP_CURRENT_MAX:
|
|
case POWER_SUPPLY_PROP_CURRENT_NOW:
|
|
case POWER_SUPPLY_PROP_CURRENT_AVG:
|
|
case POWER_SUPPLY_PROP_CURRENT_BOOT:
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline bool power_supply_is_watt_property(enum power_supply_property psp)
|
|
{
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
|
|
case POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN:
|
|
case POWER_SUPPLY_PROP_ENERGY_FULL:
|
|
case POWER_SUPPLY_PROP_ENERGY_EMPTY:
|
|
case POWER_SUPPLY_PROP_ENERGY_NOW:
|
|
case POWER_SUPPLY_PROP_ENERGY_AVG:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_OCV:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_BOOT:
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
|
|
case POWER_SUPPLY_PROP_POWER_NOW:
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
#ifdef CONFIG_POWER_SUPPLY_HWMON
|
|
int power_supply_add_hwmon_sysfs(struct power_supply *psy);
|
|
void power_supply_remove_hwmon_sysfs(struct power_supply *psy);
|
|
#else
|
|
static inline int power_supply_add_hwmon_sysfs(struct power_supply *psy)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline
|
|
void power_supply_remove_hwmon_sysfs(struct power_supply *psy) {}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
ssize_t power_supply_charge_behaviour_show(struct device *dev,
|
|
unsigned int available_behaviours,
|
|
enum power_supply_charge_behaviour behaviour,
|
|
char *buf);
|
|
|
|
int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf);
|
|
#else
|
|
static inline
|
|
ssize_t power_supply_charge_behaviour_show(struct device *dev,
|
|
unsigned int available_behaviours,
|
|
enum power_supply_charge_behaviour behaviour,
|
|
char *buf)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int power_supply_charge_behaviour_parse(unsigned int available_behaviours,
|
|
const char *buf)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
#endif
|
|
|
|
#endif /* __LINUX_POWER_SUPPLY_H__ */
|