// SPDX-License-Identifier: GPL-2.0+ /* * Fuel gauge driver for Maxim 17201/17205 * * based on max1721x_battery.c * * Copyright (C) 2024 Liebherr-Electronics and Drives GmbH */ #include <linux/bitfield.h> #include <linux/i2c.h> #include <linux/module.h> #include <linux/power_supply.h> #include <linux/regmap.h> #include <asm/unaligned.h> /* Nonvolatile registers */ #define MAX1720X_NRSENSE … /* ModelGauge m5 */ #define MAX172XX_STATUS … #define MAX172XX_STATUS_BAT_ABSENT … #define MAX172XX_REPCAP … #define MAX172XX_REPSOC … #define MAX172XX_TEMP … #define MAX172XX_CURRENT … #define MAX172XX_AVG_CURRENT … #define MAX172XX_TTE … #define MAX172XX_AVG_TA … #define MAX172XX_CYCLES … #define MAX172XX_DESIGN_CAP … #define MAX172XX_AVG_VCELL … #define MAX172XX_TTF … #define MAX172XX_DEV_NAME … #define MAX172XX_DEV_NAME_TYPE_MASK … #define MAX172XX_DEV_NAME_TYPE_MAX17201 … #define MAX172XX_DEV_NAME_TYPE_MAX17205 … #define MAX172XX_QR_TABLE10 … #define MAX172XX_BATT … #define MAX172XX_ATAVCAP … static const char *const max1720x_manufacturer = …; static const char *const max17201_model = …; static const char *const max17205_model = …; struct max1720x_device_info { … }; /* * Model Gauge M5 Algorithm output register * Volatile data (must not be cached) */ static const struct regmap_range max1720x_volatile_allow[] = …; static const struct regmap_range max1720x_readable_allow[] = …; static const struct regmap_range max1720x_readable_deny[] = …; static const struct regmap_access_table max1720x_readable_regs = …; static const struct regmap_access_table max1720x_volatile_regs = …; static const struct regmap_config max1720x_regmap_cfg = …; static const enum power_supply_property max1720x_battery_props[] = …; /* Convert regs value to power_supply units */ static int max172xx_time_to_ps(unsigned int reg) { … } static int max172xx_percent_to_ps(unsigned int reg) { … } static int max172xx_voltage_to_ps(unsigned int reg) { … } static int max172xx_capacity_to_ps(unsigned int reg) { … } /* * Current and temperature is signed values, so unsigned regs * value must be converted to signed type */ static int max172xx_temperature_to_ps(unsigned int reg) { … } /* * Calculating current registers resolution: * * RSense stored in 10^-5 Ohm, so mesaurment voltage must be * in 10^-11 Volts for get current in uA. * 16 bit current reg fullscale +/-51.2mV is 102400 uV. * So: 102400 / 65535 * 10^5 = 156252 */ static int max172xx_current_to_voltage(unsigned int reg) { … } static int max1720x_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { … } static int max1720x_probe_sense_resistor(struct i2c_client *client, struct max1720x_device_info *info) { … } static const struct power_supply_desc max1720x_bat_desc = …; static int max1720x_probe(struct i2c_client *client) { … } static const struct of_device_id max1720x_of_match[] = …; MODULE_DEVICE_TABLE(of, max1720x_of_match); static struct i2c_driver max1720x_i2c_driver = …; module_i2c_driver(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …;
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