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Diffstat (limited to 'drivers/hwmon/tmp513.c')
| -rw-r--r-- | drivers/hwmon/tmp513.c | 772 |
1 files changed, 772 insertions, 0 deletions
diff --git a/drivers/hwmon/tmp513.c b/drivers/hwmon/tmp513.c new file mode 100644 index 000000000000..df66e0bc1253 --- /dev/null +++ b/drivers/hwmon/tmp513.c @@ -0,0 +1,772 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for Texas Instruments TMP512, TMP513 power monitor chips + * + * TMP513: + * Thermal/Power Management with Triple Remote and + * Local Temperature Sensor and Current Shunt Monitor + * Datasheet: http://www.ti.com/lit/gpn/tmp513 + * + * TMP512: + * Thermal/Power Management with Dual Remote + * and Local Temperature Sensor and Current Shunt Monitor + * Datasheet: http://www.ti.com/lit/gpn/tmp512 + * + * Copyright (C) 2019 Eric Tremblay <etremblay@distech-controls.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + */ + +#include <linux/err.h> +#include <linux/hwmon.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/util_macros.h> + +// Common register definition +#define TMP51X_SHUNT_CONFIG 0x00 +#define TMP51X_TEMP_CONFIG 0x01 +#define TMP51X_STATUS 0x02 +#define TMP51X_SMBUS_ALERT 0x03 +#define TMP51X_SHUNT_CURRENT_RESULT 0x04 +#define TMP51X_BUS_VOLTAGE_RESULT 0x05 +#define TMP51X_POWER_RESULT 0x06 +#define TMP51X_BUS_CURRENT_RESULT 0x07 +#define TMP51X_LOCAL_TEMP_RESULT 0x08 +#define TMP51X_REMOTE_TEMP_RESULT_1 0x09 +#define TMP51X_REMOTE_TEMP_RESULT_2 0x0A +#define TMP51X_SHUNT_CURRENT_H_LIMIT 0x0C +#define TMP51X_SHUNT_CURRENT_L_LIMIT 0x0D +#define TMP51X_BUS_VOLTAGE_H_LIMIT 0x0E +#define TMP51X_BUS_VOLTAGE_L_LIMIT 0x0F +#define TMP51X_POWER_LIMIT 0x10 +#define TMP51X_LOCAL_TEMP_LIMIT 0x11 +#define TMP51X_REMOTE_TEMP_LIMIT_1 0x12 +#define TMP51X_REMOTE_TEMP_LIMIT_2 0x13 +#define TMP51X_SHUNT_CALIBRATION 0x15 +#define TMP51X_N_FACTOR_AND_HYST_1 0x16 +#define TMP51X_N_FACTOR_2 0x17 +#define TMP51X_MAN_ID_REG 0xFE +#define TMP51X_DEVICE_ID_REG 0xFF + +// TMP513 specific register definition +#define TMP513_REMOTE_TEMP_RESULT_3 0x0B +#define TMP513_REMOTE_TEMP_LIMIT_3 0x14 +#define TMP513_N_FACTOR_3 0x18 + +// Common attrs, and NULL +#define TMP51X_MANUFACTURER_ID 0x55FF + +#define TMP512_DEVICE_ID 0x22FF +#define TMP513_DEVICE_ID 0x23FF + +// Default config +#define TMP51X_SHUNT_CONFIG_DEFAULT 0x399F +#define TMP51X_SHUNT_VALUE_DEFAULT 1000 +#define TMP51X_VBUS_RANGE_DEFAULT TMP51X_VBUS_RANGE_32V +#define TMP51X_PGA_DEFAULT 8 +#define TMP51X_MAX_REGISTER_ADDR 0xFF + +#define TMP512_TEMP_CONFIG_DEFAULT 0xBF80 +#define TMP513_TEMP_CONFIG_DEFAULT 0xFF80 + +// Mask and shift +#define CURRENT_SENSE_VOLTAGE_320_MASK 0x1800 +#define CURRENT_SENSE_VOLTAGE_160_MASK 0x1000 +#define CURRENT_SENSE_VOLTAGE_80_MASK 0x0800 +#define CURRENT_SENSE_VOLTAGE_40_MASK 0 + +#define TMP51X_BUS_VOLTAGE_MASK 0x2000 +#define TMP51X_NFACTOR_MASK 0xFF00 +#define TMP51X_HYST_MASK 0x00FF + +#define TMP51X_BUS_VOLTAGE_SHIFT 3 +#define TMP51X_TEMP_SHIFT 3 + +// Alarms +#define TMP51X_SHUNT_CURRENT_H_LIMIT_POS 15 +#define TMP51X_SHUNT_CURRENT_L_LIMIT_POS 14 +#define TMP51X_BUS_VOLTAGE_H_LIMIT_POS 13 +#define TMP51X_BUS_VOLTAGE_L_LIMIT_POS 12 +#define TMP51X_POWER_LIMIT_POS 11 +#define TMP51X_LOCAL_TEMP_LIMIT_POS 10 +#define TMP51X_REMOTE_TEMP_LIMIT_1_POS 9 +#define TMP51X_REMOTE_TEMP_LIMIT_2_POS 8 +#define TMP513_REMOTE_TEMP_LIMIT_3_POS 7 + +#define TMP51X_VBUS_RANGE_32V 32000000 +#define TMP51X_VBUS_RANGE_16V 16000000 + +// Max and Min value +#define MAX_BUS_VOLTAGE_32_LIMIT 32764 +#define MAX_BUS_VOLTAGE_16_LIMIT 16382 + +// Max possible value is -256 to +256 but datasheet indicated -40 to 125. +#define MAX_TEMP_LIMIT 125000 +#define MIN_TEMP_LIMIT -40000 + +#define MAX_TEMP_HYST 127500 + +static const u8 TMP51X_TEMP_INPUT[4] = { + TMP51X_LOCAL_TEMP_RESULT, + TMP51X_REMOTE_TEMP_RESULT_1, + TMP51X_REMOTE_TEMP_RESULT_2, + TMP513_REMOTE_TEMP_RESULT_3 +}; + +static const u8 TMP51X_TEMP_CRIT[4] = { + TMP51X_LOCAL_TEMP_LIMIT, + TMP51X_REMOTE_TEMP_LIMIT_1, + TMP51X_REMOTE_TEMP_LIMIT_2, + TMP513_REMOTE_TEMP_LIMIT_3 +}; + +static const u8 TMP51X_TEMP_CRIT_ALARM[4] = { + TMP51X_LOCAL_TEMP_LIMIT_POS, + TMP51X_REMOTE_TEMP_LIMIT_1_POS, + TMP51X_REMOTE_TEMP_LIMIT_2_POS, + TMP513_REMOTE_TEMP_LIMIT_3_POS +}; + +static const u8 TMP51X_TEMP_CRIT_HYST[4] = { + TMP51X_N_FACTOR_AND_HYST_1, + TMP51X_N_FACTOR_AND_HYST_1, + TMP51X_N_FACTOR_AND_HYST_1, + TMP51X_N_FACTOR_AND_HYST_1 +}; + +static const u8 TMP51X_CURR_INPUT[2] = { + TMP51X_SHUNT_CURRENT_RESULT, + TMP51X_BUS_CURRENT_RESULT +}; + +static struct regmap_config tmp51x_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .max_register = TMP51X_MAX_REGISTER_ADDR, +}; + +enum tmp51x_ids { + tmp512, tmp513 +}; + +struct tmp51x_data { + u16 shunt_config; + u16 pga_gain; + u32 vbus_range_uvolt; + + u16 temp_config; + u32 nfactor[3]; + + u32 shunt_uohms; + + u32 curr_lsb_ua; + u32 pwr_lsb_uw; + + enum tmp51x_ids id; + struct regmap *regmap; +}; + +// Set the shift based on the gain 8=4, 4=3, 2=2, 1=1 +static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data) +{ + return 5 - ffs(data->pga_gain); +} + +static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos, + unsigned int regval, long *val) +{ + switch (reg) { + case TMP51X_STATUS: + *val = (regval >> pos) & 1; + break; + case TMP51X_SHUNT_CURRENT_RESULT: + case TMP51X_SHUNT_CURRENT_H_LIMIT: + case TMP51X_SHUNT_CURRENT_L_LIMIT: + /* + * The valus is read in voltage in the chip but reported as + * current to the user. + * 2's compliment number shifted by one to four depending + * on the pga gain setting. 1lsb = 10uV + */ + *val = sign_extend32(regval, 17 - tmp51x_get_pga_shift(data)); + *val = DIV_ROUND_CLOSEST(*val * 10000, data->shunt_uohms); + break; + case TMP51X_BUS_VOLTAGE_RESULT: + case TMP51X_BUS_VOLTAGE_H_LIMIT: + case TMP51X_BUS_VOLTAGE_L_LIMIT: + // 1lsb = 4mV + *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4; + break; + case TMP51X_POWER_RESULT: + case TMP51X_POWER_LIMIT: + // Power = (current * BusVoltage) / 5000 + *val = regval * data->pwr_lsb_uw; + break; + case TMP51X_BUS_CURRENT_RESULT: + // Current = (ShuntVoltage * CalibrationRegister) / 4096 + *val = sign_extend32(regval, 16) * data->curr_lsb_ua; + *val = DIV_ROUND_CLOSEST(*val, 1000); + break; + case TMP51X_LOCAL_TEMP_RESULT: + case TMP51X_REMOTE_TEMP_RESULT_1: + case TMP51X_REMOTE_TEMP_RESULT_2: + case TMP513_REMOTE_TEMP_RESULT_3: + case TMP51X_LOCAL_TEMP_LIMIT: + case TMP51X_REMOTE_TEMP_LIMIT_1: + case TMP51X_REMOTE_TEMP_LIMIT_2: + case TMP513_REMOTE_TEMP_LIMIT_3: + // 1lsb = 0.0625 degrees centigrade + *val = sign_extend32(regval, 16) >> TMP51X_TEMP_SHIFT; + *val = DIV_ROUND_CLOSEST(*val * 625, 10); + break; + case TMP51X_N_FACTOR_AND_HYST_1: + // 1lsb = 0.5 degrees centigrade + *val = (regval & TMP51X_HYST_MASK) * 500; + break; + default: + // Programmer goofed + WARN_ON_ONCE(1); + *val = 0; + return -EOPNOTSUPP; + } + + return 0; +} + +static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val) +{ + int regval, max_val; + u32 mask = 0; + + switch (reg) { + case TMP51X_SHUNT_CURRENT_H_LIMIT: + case TMP51X_SHUNT_CURRENT_L_LIMIT: + /* + * The user enter current value and we convert it to + * voltage. 1lsb = 10uV + */ + val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10000); + max_val = U16_MAX >> tmp51x_get_pga_shift(data); + regval = clamp_val(val, -max_val, max_val); + break; + case TMP51X_BUS_VOLTAGE_H_LIMIT: + case TMP51X_BUS_VOLTAGE_L_LIMIT: + // 1lsb = 4mV + max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ? + MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT; + + val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val); + regval = val << TMP51X_BUS_VOLTAGE_SHIFT; + break; + case TMP51X_POWER_LIMIT: + regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0, + U16_MAX); + break; + case TMP51X_LOCAL_TEMP_LIMIT: + case TMP51X_REMOTE_TEMP_LIMIT_1: + case TMP51X_REMOTE_TEMP_LIMIT_2: + case TMP513_REMOTE_TEMP_LIMIT_3: + // 1lsb = 0.0625 degrees centigrade + val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT); + regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT; + break; + case TMP51X_N_FACTOR_AND_HYST_1: + // 1lsb = 0.5 degrees centigrade + val = clamp_val(val, 0, MAX_TEMP_HYST); + regval = DIV_ROUND_CLOSEST(val, 500); + mask = TMP51X_HYST_MASK; + break; + default: + // Programmer goofed + WARN_ON_ONCE(1); + return -EOPNOTSUPP; + } + + if (mask == 0) + return regmap_write(data->regmap, reg, regval); + else + return regmap_update_bits(data->regmap, reg, mask, regval); +} + +static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel) +{ + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp_input: + return TMP51X_TEMP_INPUT[channel]; + case hwmon_temp_crit_alarm: + return TMP51X_STATUS; + case hwmon_temp_crit: + return TMP51X_TEMP_CRIT[channel]; + case hwmon_temp_crit_hyst: + return TMP51X_TEMP_CRIT_HYST[channel]; + } + break; + case hwmon_in: + switch (attr) { + case hwmon_in_input: + return TMP51X_BUS_VOLTAGE_RESULT; + case hwmon_in_lcrit_alarm: + case hwmon_in_crit_alarm: + return TMP51X_STATUS; + case hwmon_in_lcrit: + return TMP51X_BUS_VOLTAGE_L_LIMIT; + case hwmon_in_crit: + return TMP51X_BUS_VOLTAGE_H_LIMIT; + } + break; + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + return TMP51X_CURR_INPUT[channel]; + case hwmon_curr_lcrit_alarm: + case hwmon_curr_crit_alarm: + return TMP51X_STATUS; + case hwmon_curr_lcrit: + return TMP51X_SHUNT_CURRENT_L_LIMIT; + case hwmon_curr_crit: + return TMP51X_SHUNT_CURRENT_H_LIMIT; + } + break; + case hwmon_power: + switch (attr) { + case hwmon_power_input: + return TMP51X_POWER_RESULT; + case hwmon_power_crit_alarm: + return TMP51X_STATUS; + case hwmon_power_crit: + return TMP51X_POWER_LIMIT; + } + break; + default: + break; + } + + return 0; +} + +static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr, + int channel) +{ + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp_crit_alarm: + return TMP51X_TEMP_CRIT_ALARM[channel]; + } + break; + case hwmon_in: + switch (attr) { + case hwmon_in_lcrit_alarm: + return TMP51X_BUS_VOLTAGE_L_LIMIT_POS; + case hwmon_in_crit_alarm: + return TMP51X_BUS_VOLTAGE_H_LIMIT_POS; + } + break; + case hwmon_curr: + switch (attr) { + case hwmon_curr_lcrit_alarm: + return TMP51X_SHUNT_CURRENT_L_LIMIT_POS; + case hwmon_curr_crit_alarm: + return TMP51X_SHUNT_CURRENT_H_LIMIT_POS; + } + break; + case hwmon_power: + switch (attr) { + case hwmon_power_crit_alarm: + return TMP51X_POWER_LIMIT_POS; + } + break; + default: + break; + } + + return 0; +} + +static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct tmp51x_data *data = dev_get_drvdata(dev); + int ret; + u32 regval; + u8 pos = 0, reg = 0; + + reg = tmp51x_get_reg(type, attr, channel); + if (reg == 0) + return -EOPNOTSUPP; + + if (reg == TMP51X_STATUS) + pos = tmp51x_get_status_pos(type, attr, channel); + + ret = regmap_read(data->regmap, reg, ®val); + if (ret < 0) + return ret; + + return tmp51x_get_value(data, reg, pos, regval, val); +} + +static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + u8 reg = 0; + + reg = tmp51x_get_reg(type, attr, channel); + if (reg == 0) + return -EOPNOTSUPP; + + return tmp51x_set_value(dev_get_drvdata(dev), reg, val); +} + +static umode_t tmp51x_is_visible(const void *_data, + enum hwmon_sensor_types type, u32 attr, + int channel) +{ + const struct tmp51x_data *data = _data; + + switch (type) { + case hwmon_temp: + if (data->id == tmp512 && channel == 4) + return 0; + switch (attr) { + case hwmon_temp_input: + case hwmon_temp_crit_alarm: + return 0444; + case hwmon_temp_crit: + return 0644; + case hwmon_temp_crit_hyst: + if (channel == 0) + return 0644; + return 0444; + } + break; + case hwmon_in: + switch (attr) { + case hwmon_in_input: + case hwmon_in_lcrit_alarm: + case hwmon_in_crit_alarm: + return 0444; + case hwmon_in_lcrit: + case hwmon_in_crit: + return 0644; + } + break; + case hwmon_curr: + if (!data->shunt_uohms) + return 0; + + switch (attr) { + case hwmon_curr_input: + case hwmon_curr_lcrit_alarm: + case hwmon_curr_crit_alarm: + return 0444; + case hwmon_curr_lcrit: + case hwmon_curr_crit: + return 0644; + } + break; + case hwmon_power: + if (!data->shunt_uohms) + return 0; + + switch (attr) { + case hwmon_power_input: + case hwmon_power_crit_alarm: + return 0444; + case hwmon_power_crit: + return 0644; + } + break; + default: + break; + } + return 0; +} + +static const struct hwmon_channel_info *tmp51x_info[] = { + HWMON_CHANNEL_INFO(temp, + HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | + HWMON_T_CRIT_HYST, + HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | + HWMON_T_CRIT_HYST, + HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | + HWMON_T_CRIT_HYST, + HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | + HWMON_T_CRIT_HYST), + HWMON_CHANNEL_INFO(in, + HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM | + HWMON_I_CRIT | HWMON_I_CRIT_ALARM), + HWMON_CHANNEL_INFO(curr, + HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM | + HWMON_C_CRIT | HWMON_C_CRIT_ALARM, + HWMON_C_INPUT), + HWMON_CHANNEL_INFO(power, + HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM), + NULL +}; + +static const struct hwmon_ops tmp51x_hwmon_ops = { + .is_visible = tmp51x_is_visible, + .read = tmp51x_read, + .write = tmp51x_write, +}; + +static const struct hwmon_chip_info tmp51x_chip_info = { + .ops = &tmp51x_hwmon_ops, + .info = tmp51x_info, +}; + +/* + * Calibrate the tmp51x following the datasheet method + */ +static int tmp51x_calibrate(struct tmp51x_data *data) +{ + int vshunt_max = data->pga_gain * 40; + u64 max_curr_ma; + u32 div; + + /* + * If shunt_uohms is equal to 0, the calibration should be set to 0. + * The consequence will be that the current and power measurement engine + * of the sensor will not work. Temperature and voltage sensing will + * continue to work. + */ + if (data->shunt_uohms == 0) + return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0); + + max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * 1000 * 1000, + data->shunt_uohms); + + /* + * Calculate the minimal bit resolution for the current and the power. + * Those values will be used during register interpretation. + */ + data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * 1000, 32767); + data->pwr_lsb_uw = 20 * data->curr_lsb_ua; + + div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, + 1000 * 1000); + + return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, + DIV_ROUND_CLOSEST(40960, div)); +} + +/* + * Initialize the configuration and calibration registers. + */ +static int tmp51x_init(struct tmp51x_data *data) +{ + unsigned int regval; + int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG, + data->shunt_config); + if (ret < 0) + return ret; + + ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config); + if (ret < 0) + return ret; + + // nFactor configuration + ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1, + TMP51X_NFACTOR_MASK, data->nfactor[0] << 8); + if (ret < 0) + return ret; + + ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2, + data->nfactor[1] << 8); + if (ret < 0) + return ret; + + if (data->id == tmp513) { + ret = regmap_write(data->regmap, TMP513_N_FACTOR_3, + data->nfactor[2] << 8); + if (ret < 0) + return ret; + } + + ret = tmp51x_calibrate(data); + if (ret < 0) + return ret; + + // Read the status register before using as the datasheet propose + return regmap_read(data->regmap, TMP51X_STATUS, ®val); +} + +static const struct i2c_device_id tmp51x_id[] = { + { "tmp512", tmp512 }, + { "tmp513", tmp513 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tmp51x_id); + +static const struct of_device_id tmp51x_of_match[] = { + { + .compatible = "ti,tmp512", + .data = (void *)tmp512 + }, + { + .compatible = "ti,tmp513", + .data = (void *)tmp513 + }, + { }, +}; +MODULE_DEVICE_TABLE(of, tmp51x_of_match); + +static int tmp51x_vbus_range_to_reg(struct device *dev, + struct tmp51x_data *data) +{ + if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) { + data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK; + } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) { + data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK; + } else { + dev_err(dev, "ti,bus-range-microvolt is invalid: %u\n", + data->vbus_range_uvolt); + return -EINVAL; + } + return 0; +} + +static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data) +{ + if (data->pga_gain == 8) { + data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK; + } else if (data->pga_gain == 4) { + data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK; + } else if (data->pga_gain == 2) { + data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK; + } else if (data->pga_gain == 1) { + data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK; + } else { + dev_err(dev, "ti,pga-gain is invalid: %u\n", data->pga_gain); + return -EINVAL; + } + return 0; +} + +static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data) +{ + int ret; + u32 nfactor[3]; + u32 val; + + ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val); + data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT; + + ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val); + data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT; + ret = tmp51x_vbus_range_to_reg(dev, data); + if (ret < 0) + return ret; + + ret = device_property_read_u32(dev, "ti,pga-gain", &val); + data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT; + ret = tmp51x_pga_gain_to_reg(dev, data); + if (ret < 0) + return ret; + + ret = device_property_read_u32_array(dev, "ti,nfactor", nfactor, + (data->id == tmp513) ? 3 : 2); + if (ret >= 0) + memcpy(data->nfactor, nfactor, (data->id == tmp513) ? 3 : 2); + + // Check if shunt value is compatible with pga-gain + if (data->shunt_uohms > data->pga_gain * 40 * 1000 * 1000) { + dev_err(dev, "shunt-resistor: %u too big for pga_gain: %u\n", + data->shunt_uohms, data->pga_gain); + return -EINVAL; + } + + return 0; +} + +static void tmp51x_use_default(struct tmp51x_data *data) +{ + data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT; + data->pga_gain = TMP51X_PGA_DEFAULT; + data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT; +} + +static int tmp51x_configure(struct device *dev, struct tmp51x_data *data) +{ + data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT; + data->temp_config = (data->id == tmp513) ? + TMP513_TEMP_CONFIG_DEFAULT : TMP512_TEMP_CONFIG_DEFAULT; + + if (dev->of_node) + return tmp51x_read_properties(dev, data); + + tmp51x_use_default(data); + + return 0; +} + +static int tmp51x_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct tmp51x_data *data; + struct device *hwmon_dev; + int ret; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + if (client->dev.of_node) + data->id = (enum tmp51x_ids)device_get_match_data(&client->dev); + else + data->id = id->driver_data; + + ret = tmp51x_configure(dev, data); + if (ret < 0) { + dev_err(dev, "error configuring the device: %d\n", ret); + return ret; + } + + data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config); + if (IS_ERR(data->regmap)) { + dev_err(dev, "failed to allocate register map\n"); + return PTR_ERR(data->regmap); + } + + ret = tmp51x_init(data); + if (ret < 0) { + dev_err(dev, "error configuring the device: %d\n", ret); + return -ENODEV; + } + + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, + data, + &tmp51x_chip_info, + NULL); + if (IS_ERR(hwmon_dev)) + return PTR_ERR(hwmon_dev); + + dev_dbg(dev, "power monitor %s\n", id->name); + + return 0; +} + +static struct i2c_driver tmp51x_driver = { + .driver = { + .name = "tmp51x", + .of_match_table = of_match_ptr(tmp51x_of_match), + }, + .probe = tmp51x_probe, + .id_table = tmp51x_id, +}; + +module_i2c_driver(tmp51x_driver); + +MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>"); +MODULE_DESCRIPTION("tmp51x driver"); +MODULE_LICENSE("GPL"); |