// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for Analog Devices (Linear Technology) LTC4162-L charger IC. * Copyright (C) 2020, Topic Embedded Products */ #include <linux/module.h> #include <linux/delay.h> #include <linux/of.h> #include <linux/pm_runtime.h> #include <linux/power_supply.h> #include <linux/i2c.h> #include <linux/regmap.h> /* Registers (names based on what datasheet uses) */ #define LTC4162L_EN_LIMIT_ALERTS_REG … #define LTC4162L_EN_CHARGER_STATE_ALERTS_REG … #define LTC4162L_EN_CHARGE_STATUS_ALERTS_REG … #define LTC4162L_CONFIG_BITS_REG … #define LTC4162L_IIN_LIMIT_TARGET … #define LTC4162L_ARM_SHIP_MODE … #define LTC4162L_CHARGE_CURRENT_SETTING … #define LTC4162L_VCHARGE_SETTING … #define LTC4162L_C_OVER_X_THRESHOLD … #define LTC4162L_MAX_CV_TIME … #define LTC4162L_MAX_CHARGE_TIME … #define LTC4162L_CHARGER_CONFIG_BITS … #define LTC4162L_CHARGER_STATE … #define LTC4162L_CHARGE_STATUS … #define LTC4162L_LIMIT_ALERTS_REG … #define LTC4162L_CHARGER_STATE_ALERTS_REG … #define LTC4162L_CHARGE_STATUS_ALERTS_REG … #define LTC4162L_SYSTEM_STATUS_REG … #define LTC4162L_VBAT … #define LTC4162L_VIN … #define LTC4162L_VOUT … #define LTC4162L_IBAT … #define LTC4162L_IIN … #define LTC4162L_DIE_TEMPERATURE … #define LTC4162L_THERMISTOR_VOLTAGE … #define LTC4162L_BSR … #define LTC4162L_JEITA_REGION … #define LTC4162L_CHEM_CELLS_REG … #define LTC4162L_ICHARGE_DAC … #define LTC4162L_VCHARGE_DAC … #define LTC4162L_IIN_LIMIT_DAC … #define LTC4162L_VBAT_FILT … #define LTC4162L_INPUT_UNDERVOLTAGE_DAC … /* Enumeration as in datasheet. Individual bits are mutually exclusive. */ enum ltc4162l_state { … }; /* Individual bits are mutually exclusive. Only active in charging states.*/ enum ltc4162l_charge_status { … }; /* Magic number to write to ARM_SHIP_MODE register */ #define LTC4162L_ARM_SHIP_MODE_MAGIC … struct ltc4162l_info { … }; static u8 ltc4162l_get_cell_count(struct ltc4162l_info *info) { int ret; unsigned int val; /* Once read successfully */ if (info->cell_count) return info->cell_count; ret = regmap_read(info->regmap, LTC4162L_CHEM_CELLS_REG, &val); if (ret) return 0; /* Lower 4 bits is the cell count, or 0 if the chip doesn't know yet */ val &= 0x0f; if (!val) return 0; /* Once determined, keep the value */ info->cell_count = val; return val; }; /* Convert enum value to POWER_SUPPLY_STATUS value */ static int ltc4162l_state_decode(enum ltc4162l_state value) { switch (value) { case precharge: case cc_cv_charge: return POWER_SUPPLY_STATUS_CHARGING; case c_over_x_term: return POWER_SUPPLY_STATUS_FULL; case bat_missing_fault: case bat_short_fault: return POWER_SUPPLY_STATUS_UNKNOWN; default: return POWER_SUPPLY_STATUS_NOT_CHARGING; } }; static int ltc4162l_get_status(struct ltc4162l_info *info, union power_supply_propval *val) { … } static int ltc4162l_charge_status_decode(enum ltc4162l_charge_status value) { … } static int ltc4162l_get_charge_type(struct ltc4162l_info *info, union power_supply_propval *val) { … } static int ltc4162l_state_to_health(enum ltc4162l_state value) { … } static int ltc4162l_get_health(struct ltc4162l_info *info, union power_supply_propval *val) { … } static int ltc4162l_get_online(struct ltc4162l_info *info, union power_supply_propval *val) { … } static int ltc4162l_get_vbat(struct ltc4162l_info *info, unsigned int reg, union power_supply_propval *val) { … } static int ltc4162l_get_ibat(struct ltc4162l_info *info, union power_supply_propval *val) { … } static int ltc4162l_get_input_voltage(struct ltc4162l_info *info, union power_supply_propval *val) { … } static int ltc4162l_get_input_current(struct ltc4162l_info *info, union power_supply_propval *val) { … } static int ltc4162l_get_icharge(struct ltc4162l_info *info, unsigned int reg, union power_supply_propval *val) { … } static int ltc4162l_set_icharge(struct ltc4162l_info *info, unsigned int reg, unsigned int value) { … } static int ltc4162l_get_vcharge(struct ltc4162l_info *info, unsigned int reg, union power_supply_propval *val) { … } static int ltc4162l_set_vcharge(struct ltc4162l_info *info, unsigned int reg, unsigned int value) { … } static int ltc4162l_get_iin_limit_dac(struct ltc4162l_info *info, union power_supply_propval *val) { … } static int ltc4162l_set_iin_limit(struct ltc4162l_info *info, unsigned int value) { … } static int ltc4162l_get_die_temp(struct ltc4162l_info *info, union power_supply_propval *val) { … } static int ltc4162l_get_term_current(struct ltc4162l_info *info, union power_supply_propval *val) { … } static int ltc4162l_set_term_current(struct ltc4162l_info *info, unsigned int value) { … } /* Custom properties */ static const char * const ltc4162l_charge_status_name[] = …; static ssize_t charge_status_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(charge_status); static ssize_t vbat_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(vbat); static ssize_t vbat_avg_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(vbat_avg); static ssize_t ibat_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(ibat); static ssize_t force_telemetry_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t force_telemetry_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static DEVICE_ATTR_RW(force_telemetry); static ssize_t arm_ship_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t arm_ship_mode_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static DEVICE_ATTR_RW(arm_ship_mode); static struct attribute *ltc4162l_sysfs_entries[] = …; static const struct attribute_group ltc4162l_attr_group = …; static const struct attribute_group *ltc4162l_attr_groups[] = …; static int ltc4162l_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { … } static int ltc4162l_set_property(struct power_supply *psy, enum power_supply_property psp, const union power_supply_propval *val) { … } static int ltc4162l_property_is_writeable(struct power_supply *psy, enum power_supply_property psp) { … } /* Charger power supply property routines */ static enum power_supply_property ltc4162l_properties[] = …; static const struct power_supply_desc ltc4162l_desc = …; static bool ltc4162l_is_writeable_reg(struct device *dev, unsigned int reg) { … } static bool ltc4162l_is_volatile_reg(struct device *dev, unsigned int reg) { … } static const struct regmap_config ltc4162l_regmap_config = …; static void ltc4162l_clear_interrupts(struct ltc4162l_info *info) { … } static int ltc4162l_probe(struct i2c_client *client) { … } static void ltc4162l_alert(struct i2c_client *client, enum i2c_alert_protocol type, unsigned int flag) { … } static const struct i2c_device_id ltc4162l_i2c_id_table[] = …; MODULE_DEVICE_TABLE(i2c, ltc4162l_i2c_id_table); static const struct of_device_id ltc4162l_of_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(of, ltc4162l_of_match); static struct i2c_driver ltc4162l_driver = …; module_i2c_driver(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …;
Codebase Browser
linux