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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Universal power supply monitor class
*
* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
* Copyright © 2004 Szabolcs Gyurko
* Copyright © 2003 Ian Molton <spyro@f2s.com>
*
* Modified: 2004, Oct Szabolcs Gyurko
*/
#ifndef __LINUX_POWER_SUPPLY_H__
#define __LINUX_POWER_SUPPLY_H__
#include <linux/device.h>
#include <linux/workqueue.h>
#include <linux/leds.h>
#include <linux/spinlock.h>
#include <linux/notifier.h>
/*
* All voltages, currents, charges, energies, time and temperatures in uV,
* µA, µAh, µWh, seconds and tenths of degree Celsius unless otherwise
* stated. It's driver's job to convert its raw values to units in which
* this class operates.
*/
/*
* For systems where the charger determines the maximum battery capacity
* the min and max fields should be used to present these values to user
* space. Unused/unknown fields will not appear in sysfs.
*/
enum {
POWER_SUPPLY_STATUS_UNKNOWN = 0,
POWER_SUPPLY_STATUS_CHARGING,
POWER_SUPPLY_STATUS_DISCHARGING,
POWER_SUPPLY_STATUS_NOT_CHARGING,
POWER_SUPPLY_STATUS_FULL,
};
/* What algorithm is the charger using? */
enum {
POWER_SUPPLY_CHARGE_TYPE_UNKNOWN = 0,
POWER_SUPPLY_CHARGE_TYPE_NONE,
POWER_SUPPLY_CHARGE_TYPE_TRICKLE, /* slow speed */
POWER_SUPPLY_CHARGE_TYPE_FAST, /* fast speed */
POWER_SUPPLY_CHARGE_TYPE_STANDARD, /* normal speed */
POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE, /* dynamically adjusted speed */
POWER_SUPPLY_CHARGE_TYPE_CUSTOM, /* use CHARGE_CONTROL_* props */
POWER_SUPPLY_CHARGE_TYPE_LONGLIFE, /* slow speed, longer life */
POWER_SUPPLY_CHARGE_TYPE_BYPASS, /* bypassing the charger */
};
enum {
POWER_SUPPLY_HEALTH_UNKNOWN = 0,
POWER_SUPPLY_HEALTH_GOOD,
POWER_SUPPLY_HEALTH_OVERHEAT,
POWER_SUPPLY_HEALTH_DEAD,
POWER_SUPPLY_HEALTH_OVERVOLTAGE,
POWER_SUPPLY_HEALTH_UNSPEC_FAILURE,
POWER_SUPPLY_HEALTH_COLD,
POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE,
POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE,
POWER_SUPPLY_HEALTH_OVERCURRENT,
POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED,
POWER_SUPPLY_HEALTH_WARM,
POWER_SUPPLY_HEALTH_COOL,
POWER_SUPPLY_HEALTH_HOT,
POWER_SUPPLY_HEALTH_NO_BATTERY,
};
enum {
POWER_SUPPLY_TECHNOLOGY_UNKNOWN = 0,
POWER_SUPPLY_TECHNOLOGY_NiMH,
POWER_SUPPLY_TECHNOLOGY_LION,
POWER_SUPPLY_TECHNOLOGY_LIPO,
POWER_SUPPLY_TECHNOLOGY_LiFe,
POWER_SUPPLY_TECHNOLOGY_NiCd,
POWER_SUPPLY_TECHNOLOGY_LiMn,
};
enum {
POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN = 0,
POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL,
POWER_SUPPLY_CAPACITY_LEVEL_LOW,
POWER_SUPPLY_CAPACITY_LEVEL_NORMAL,
POWER_SUPPLY_CAPACITY_LEVEL_HIGH,
POWER_SUPPLY_CAPACITY_LEVEL_FULL,
};
enum {
POWER_SUPPLY_SCOPE_UNKNOWN = 0,
POWER_SUPPLY_SCOPE_SYSTEM,
POWER_SUPPLY_SCOPE_DEVICE,
};
enum power_supply_property {
/* Properties of type `int' */
POWER_SUPPLY_PROP_STATUS = 0,
POWER_SUPPLY_PROP_CHARGE_TYPE,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_AUTHENTIC,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_CYCLE_COUNT,
POWER_SUPPLY_PROP_VOLTAGE_MAX,
POWER_SUPPLY_PROP_VOLTAGE_MIN,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
POWER_SUPPLY_PROP_VOLTAGE_OCV,
POWER_SUPPLY_PROP_VOLTAGE_BOOT,
POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CURRENT_AVG,
POWER_SUPPLY_PROP_CURRENT_BOOT,
POWER_SUPPLY_PROP_POWER_NOW,
POWER_SUPPLY_PROP_POWER_AVG,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_EMPTY,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CHARGE_AVG,
POWER_SUPPLY_PROP_CHARGE_COUNTER,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX,
POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD, /* in percents! */
POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD, /* in percents! */
POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR,
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
POWER_SUPPLY_PROP_INPUT_POWER_LIMIT,
POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN,
POWER_SUPPLY_PROP_ENERGY_FULL,
POWER_SUPPLY_PROP_ENERGY_EMPTY,
POWER_SUPPLY_PROP_ENERGY_NOW,
POWER_SUPPLY_PROP_ENERGY_AVG,
POWER_SUPPLY_PROP_CAPACITY, /* in percents! */
POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN, /* in percents! */
POWER_SUPPLY_PROP_CAPACITY_ALERT_MAX, /* in percents! */
POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN, /* in percents! */
POWER_SUPPLY_PROP_CAPACITY_LEVEL,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_TEMP_MAX,
POWER_SUPPLY_PROP_TEMP_MIN,
POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
POWER_SUPPLY_PROP_TEMP_AMBIENT,
POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN,
POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
POWER_SUPPLY_PROP_TYPE, /* use power_supply.type instead */
POWER_SUPPLY_PROP_USB_TYPE,
POWER_SUPPLY_PROP_SCOPE,
POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
POWER_SUPPLY_PROP_CALIBRATE,
POWER_SUPPLY_PROP_MANUFACTURE_YEAR,
POWER_SUPPLY_PROP_MANUFACTURE_MONTH,
POWER_SUPPLY_PROP_MANUFACTURE_DAY,
/* Properties of type `const char *' */
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
POWER_SUPPLY_PROP_SERIAL_NUMBER,
};
enum power_supply_type {
POWER_SUPPLY_TYPE_UNKNOWN = 0,
POWER_SUPPLY_TYPE_BATTERY,
POWER_SUPPLY_TYPE_UPS,
POWER_SUPPLY_TYPE_MAINS,
POWER_SUPPLY_TYPE_USB, /* Standard Downstream Port */
POWER_SUPPLY_TYPE_USB_DCP, /* Dedicated Charging Port */
POWER_SUPPLY_TYPE_USB_CDP, /* Charging Downstream Port */
POWER_SUPPLY_TYPE_USB_ACA, /* Accessory Charger Adapters */
POWER_SUPPLY_TYPE_USB_TYPE_C, /* Type C Port */
POWER_SUPPLY_TYPE_USB_PD, /* Power Delivery Port */
POWER_SUPPLY_TYPE_USB_PD_DRP, /* PD Dual Role Port */
POWER_SUPPLY_TYPE_APPLE_BRICK_ID, /* Apple Charging Method */
POWER_SUPPLY_TYPE_WIRELESS, /* Wireless */
};
enum power_supply_usb_type {
POWER_SUPPLY_USB_TYPE_UNKNOWN = 0,
POWER_SUPPLY_USB_TYPE_SDP, /* Standard Downstream Port */
POWER_SUPPLY_USB_TYPE_DCP, /* Dedicated Charging Port */
POWER_SUPPLY_USB_TYPE_CDP, /* Charging Downstream Port */
POWER_SUPPLY_USB_TYPE_ACA, /* Accessory Charger Adapters */
POWER_SUPPLY_USB_TYPE_C, /* Type C Port */
POWER_SUPPLY_USB_TYPE_PD, /* Power Delivery Port */
POWER_SUPPLY_USB_TYPE_PD_DRP, /* PD Dual Role Port */
POWER_SUPPLY_USB_TYPE_PD_PPS, /* PD Programmable Power Supply */
POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID, /* Apple Charging Method */
};
enum power_supply_charge_behaviour {
POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO = 0,
POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE,
POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE,
};
enum power_supply_notifier_events {
PSY_EVENT_PROP_CHANGED,
};
union power_supply_propval {
int intval;
const char *strval;
};
struct device_node;
struct power_supply;
/* Run-time specific power supply configuration */
struct power_supply_config {
struct device_node *of_node;
struct fwnode_handle *fwnode;
/* Driver private data */
void *drv_data;
/* Device specific sysfs attributes */
const struct attribute_group **attr_grp;
char **supplied_to;
size_t num_supplicants;
};
/* Description of power supply */
struct power_supply_desc {
const char *name;
enum power_supply_type type;
const enum power_supply_usb_type *usb_types;
size_t num_usb_types;
const enum power_supply_property *properties;
size_t num_properties;
/*
* Functions for drivers implementing power supply class.
* These shouldn't be called directly by other drivers for accessing
* this power supply. Instead use power_supply_*() functions (for
* example power_supply_get_property()).
*/
int (*get_property)(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val);
int (*set_property)(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val);
/*
* property_is_writeable() will be called during registration
* of power supply. If this happens during device probe then it must
* not access internal data of device (because probe did not end).
*/
int (*property_is_writeable)(struct power_supply *psy,
enum power_supply_property psp);
void (*external_power_changed)(struct power_supply *psy);
void (*set_charged)(struct power_supply *psy);
/*
* Set if thermal zone should not be created for this power supply.
* For example for virtual supplies forwarding calls to actual
* sensors or other supplies.
*/
bool no_thermal;
/* For APM emulation, think legacy userspace. */
int use_for_apm;
};
struct power_supply {
const struct power_supply_desc *desc;
char **supplied_to;
size_t num_supplicants;
char **supplied_from;
size_t num_supplies;
struct device_node *of_node;
/* Driver private data */
void *drv_data;
/* private */
struct device dev;
struct work_struct changed_work;
struct delayed_work deferred_register_work;
spinlock_t changed_lock;
bool changed;
bool initialized;
bool removing;
atomic_t use_cnt;
#ifdef CONFIG_THERMAL
struct thermal_zone_device *tzd;
struct thermal_cooling_device *tcd;
#endif
#ifdef CONFIG_LEDS_TRIGGERS
struct led_trigger *charging_full_trig;
char *charging_full_trig_name;
struct led_trigger *charging_trig;
char *charging_trig_name;
struct led_trigger *full_trig;
char *full_trig_name;
struct led_trigger *online_trig;
char *online_trig_name;
struct led_trigger *charging_blink_full_solid_trig;
char *charging_blink_full_solid_trig_name;
#endif
};
/*
* This is recommended structure to specify static power supply parameters.
* Generic one, parametrizable for different power supplies. Power supply
* class itself does not use it, but that's what implementing most platform
* drivers, should try reuse for consistency.
*/
struct power_supply_info {
const char *name;
int technology;
int voltage_max_design;
int voltage_min_design;
int charge_full_design;
int charge_empty_design;
int energy_full_design;
int energy_empty_design;
int use_for_apm;
};
struct power_supply_battery_ocv_table {
int ocv; /* microVolts */
int capacity; /* percent */
};
struct power_supply_resistance_temp_table {
int temp; /* celsius */
int resistance; /* internal resistance percent */
};
struct power_supply_vbat_ri_table {
int vbat_uv; /* Battery voltage in microvolt */
int ri_uohm; /* Internal resistance in microohm */
};
/**
* struct power_supply_maintenance_charge_table - setting for maintenace charging
* @charge_current_max_ua: maintenance charging current that is used to keep
* the charge of the battery full as current is consumed after full charging.
* The corresponding charge_voltage_max_uv is used as a safeguard: when we
* reach this voltage the maintenance charging current is turned off. It is
* turned back on if we fall below this voltage.
* @charge_voltage_max_uv: maintenance charging voltage that is usually a bit
* lower than the constant_charge_voltage_max_uv. We can apply this settings
* charge_current_max_ua until we get back up to this voltage.
* @safety_timer_minutes: maintenance charging safety timer, with an expiry
* time in minutes. We will only use maintenance charging in this setting
* for a certain amount of time, then we will first move to the next
* maintenance charge current and voltage pair in respective array and wait
* for the next safety timer timeout, or, if we reached the last maintencance
* charging setting, disable charging until we reach
* charge_restart_voltage_uv and restart ordinary CC/CV charging from there.
* These timers should be chosen to align with the typical discharge curve
* for the battery.
*
* Ordinary CC/CV charging will stop charging when the charge current goes
* below charge_term_current_ua, and then restart it (if the device is still
* plugged into the charger) at charge_restart_voltage_uv. This happens in most
* consumer products because the power usage while connected to a charger is
* not zero, and devices are not manufactured to draw power directly from the
* charger: instead they will at all times dissipate the battery a little, like
* the power used in standby mode. This will over time give a charge graph
* such as this:
*
* Energy
* ^ ... ... ... ... ... ... ...
* | . . . . . . . . . . . . .
* | .. . .. . .. . .. . .. . .. . ..
* |. .. .. .. .. .. ..
* +-------------------------------------------------------------------> t
*
* Practically this means that the Li-ions are wandering back and forth in the
* battery and this causes degeneration of the battery anode and cathode.
* To prolong the life of the battery, maintenance charging is applied after
* reaching charge_term_current_ua to hold up the charge in the battery while
* consuming power, thus lowering the wear on the battery:
*
* Energy
* ^ .......................................
* | . ......................
* | ..
* |.
* +-------------------------------------------------------------------> t
*
* Maintenance charging uses the voltages from this table: a table of settings
* is traversed using a slightly lower current and voltage than what is used for
* CC/CV charging. The maintenance charging will for safety reasons not go on
* indefinately: we lower the current and voltage with successive maintenance
* settings, then disable charging completely after we reach the last one,
* and after that we do not restart charging until we reach
* charge_restart_voltage_uv (see struct power_supply_battery_info) and restart
* ordinary CC/CV charging from there.
*
* As an example, a Samsung EB425161LA Lithium-Ion battery is CC/CV charged
* at 900mA to 4340mV, then maintenance charged at 600mA and 4150mV for up to
* 60 hours, then maintenance charged at 600mA and 4100mV for up to 200 hours.
* After this the charge cycle is restarted waiting for
* charge_restart_voltage_uv.
*
* For most mobile electronics this type of maintenance charging is enough for
* the user to disconnect the device and make use of it before both maintenance
* charging cycles are complete, if the current and voltage has been chosen
* appropriately. These need to be determined from battery discharge curves
* and expected standby current.
*
* If the voltage anyway drops to charge_restart_voltage_uv during maintenance
* charging, ordinary CC/CV charging is restarted. This can happen if the
* device is e.g. actively used during charging, so more current is drawn than
* 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;
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;
struct power_supply_vbat_ri_table *vbat2ri_discharging;
int vbat2ri_discharging_size;
struct power_supply_vbat_ri_table *vbat2ri_charging;
int vbat2ri_charging_size;
int bti_resistance_ohm;
int bti_resistance_tolerance;
};
extern struct atomic_notifier_head power_supply_notifier;
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 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 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 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)
{
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)
{
return ((info->vbat2ri_discharging != NULL) &&
info->vbat2ri_discharging_size > 0);
}
static inline bool
power_supply_supports_temp2ri(struct power_supply_battery_info *info)
{
return ((info->resist_table != NULL) &&
info->resist_table_size > 0);
}
#ifdef CONFIG_POWER_SUPPLY
extern int power_supply_is_system_supplied(void);
#else
static inline int power_supply_is_system_supplied(void) { return -ENOSYS; }
#endif
extern int power_supply_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val);
#if IS_ENABLED(CONFIG_POWER_SUPPLY)
extern int power_supply_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val);
#else
static inline int power_supply_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{ return 0; }
#endif
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);
extern struct power_supply *__must_check
power_supply_register(struct device *parent,
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);
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);
/* For APM emulation, think legacy userspace. */
extern struct class *power_supply_class;
static inline bool power_supply_is_amp_property(enum power_supply_property psp)
{
switch (psp) {
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__ */