// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for Linear Technology LTC2945 I2C Power Monitor * * Copyright (c) 2014 Guenter Roeck */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/err.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/jiffies.h> #include <linux/regmap.h> /* chip registers */ #define LTC2945_CONTROL … #define LTC2945_ALERT … #define LTC2945_STATUS … #define LTC2945_FAULT … #define LTC2945_POWER_H … #define LTC2945_MAX_POWER_H … #define LTC2945_MIN_POWER_H … #define LTC2945_MAX_POWER_THRES_H … #define LTC2945_MIN_POWER_THRES_H … #define LTC2945_SENSE_H … #define LTC2945_MAX_SENSE_H … #define LTC2945_MIN_SENSE_H … #define LTC2945_MAX_SENSE_THRES_H … #define LTC2945_MIN_SENSE_THRES_H … #define LTC2945_VIN_H … #define LTC2945_MAX_VIN_H … #define LTC2945_MIN_VIN_H … #define LTC2945_MAX_VIN_THRES_H … #define LTC2945_MIN_VIN_THRES_H … #define LTC2945_ADIN_H … #define LTC2945_MAX_ADIN_H … #define LTC2945_MIN_ADIN_H … #define LTC2945_MAX_ADIN_THRES_H … #define LTC2945_MIN_ADIN_THRES_H … #define LTC2945_MIN_ADIN_THRES_L … /* Fault register bits */ #define FAULT_ADIN_UV … #define FAULT_ADIN_OV … #define FAULT_VIN_UV … #define FAULT_VIN_OV … #define FAULT_SENSE_UV … #define FAULT_SENSE_OV … #define FAULT_POWER_UV … #define FAULT_POWER_OV … /* Control register bits */ #define CONTROL_MULT_SELECT … #define CONTROL_TEST_MODE … static const struct of_device_id __maybe_unused ltc2945_of_match[] = …; MODULE_DEVICE_TABLE(of, ltc2945_of_match); /** * struct ltc2945_data - LTC2945 device data * @regmap: regmap device * @shunt_resistor: shunt resistor value in micro ohms (1000 by default) */ struct ltc2945_data { … }; static inline bool is_power_reg(u8 reg) { … } /* Return the value from the given register in uW, mV, or mA */ static long long ltc2945_reg_to_val(struct device *dev, u8 reg) { … } static long long ltc2945_val_to_reg(struct device *dev, u8 reg, unsigned long long val) { … } static ssize_t ltc2945_value_show(struct device *dev, struct device_attribute *da, char *buf) { … } static ssize_t ltc2945_value_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { … } static ssize_t ltc2945_history_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { … } static ssize_t ltc2945_bool_show(struct device *dev, struct device_attribute *da, char *buf) { … } /* Input voltages */ static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2945_value, LTC2945_VIN_H); static SENSOR_DEVICE_ATTR_RW(in1_min, ltc2945_value, LTC2945_MIN_VIN_THRES_H); static SENSOR_DEVICE_ATTR_RW(in1_max, ltc2945_value, LTC2945_MAX_VIN_THRES_H); static SENSOR_DEVICE_ATTR_RO(in1_lowest, ltc2945_value, LTC2945_MIN_VIN_H); static SENSOR_DEVICE_ATTR_RO(in1_highest, ltc2945_value, LTC2945_MAX_VIN_H); static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ltc2945_history, LTC2945_MIN_VIN_H); static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2945_value, LTC2945_ADIN_H); static SENSOR_DEVICE_ATTR_RW(in2_min, ltc2945_value, LTC2945_MIN_ADIN_THRES_H); static SENSOR_DEVICE_ATTR_RW(in2_max, ltc2945_value, LTC2945_MAX_ADIN_THRES_H); static SENSOR_DEVICE_ATTR_RO(in2_lowest, ltc2945_value, LTC2945_MIN_ADIN_H); static SENSOR_DEVICE_ATTR_RO(in2_highest, ltc2945_value, LTC2945_MAX_ADIN_H); static SENSOR_DEVICE_ATTR_WO(in2_reset_history, ltc2945_history, LTC2945_MIN_ADIN_H); /* Voltage alarms */ static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc2945_bool, FAULT_VIN_UV); static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc2945_bool, FAULT_VIN_OV); static SENSOR_DEVICE_ATTR_RO(in2_min_alarm, ltc2945_bool, FAULT_ADIN_UV); static SENSOR_DEVICE_ATTR_RO(in2_max_alarm, ltc2945_bool, FAULT_ADIN_OV); /* Currents (via sense resistor) */ static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2945_value, LTC2945_SENSE_H); static SENSOR_DEVICE_ATTR_RW(curr1_min, ltc2945_value, LTC2945_MIN_SENSE_THRES_H); static SENSOR_DEVICE_ATTR_RW(curr1_max, ltc2945_value, LTC2945_MAX_SENSE_THRES_H); static SENSOR_DEVICE_ATTR_RO(curr1_lowest, ltc2945_value, LTC2945_MIN_SENSE_H); static SENSOR_DEVICE_ATTR_RO(curr1_highest, ltc2945_value, LTC2945_MAX_SENSE_H); static SENSOR_DEVICE_ATTR_WO(curr1_reset_history, ltc2945_history, LTC2945_MIN_SENSE_H); /* Current alarms */ static SENSOR_DEVICE_ATTR_RO(curr1_min_alarm, ltc2945_bool, FAULT_SENSE_UV); static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc2945_bool, FAULT_SENSE_OV); /* Power */ static SENSOR_DEVICE_ATTR_RO(power1_input, ltc2945_value, LTC2945_POWER_H); static SENSOR_DEVICE_ATTR_RW(power1_min, ltc2945_value, LTC2945_MIN_POWER_THRES_H); static SENSOR_DEVICE_ATTR_RW(power1_max, ltc2945_value, LTC2945_MAX_POWER_THRES_H); static SENSOR_DEVICE_ATTR_RO(power1_input_lowest, ltc2945_value, LTC2945_MIN_POWER_H); static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ltc2945_value, LTC2945_MAX_POWER_H); static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ltc2945_history, LTC2945_MIN_POWER_H); /* Power alarms */ static SENSOR_DEVICE_ATTR_RO(power1_min_alarm, ltc2945_bool, FAULT_POWER_UV); static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ltc2945_bool, FAULT_POWER_OV); static struct attribute *ltc2945_attrs[] = …; ATTRIBUTE_GROUPS(…); static const struct regmap_config ltc2945_regmap_config = …; static int ltc2945_probe(struct i2c_client *client) { … } static const struct i2c_device_id ltc2945_id[] = …; MODULE_DEVICE_TABLE(i2c, ltc2945_id); static struct i2c_driver ltc2945_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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