diff options
Diffstat (limited to 'drivers/hwmon/ina238.c')
| -rw-r--r-- | drivers/hwmon/ina238.c | 892 |
1 files changed, 892 insertions, 0 deletions
diff --git a/drivers/hwmon/ina238.c b/drivers/hwmon/ina238.c new file mode 100644 index 000000000000..ff67b03189f7 --- /dev/null +++ b/drivers/hwmon/ina238.c @@ -0,0 +1,892 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for Texas Instruments INA238 power monitor chip + * Datasheet: https://www.ti.com/product/ina238 + * + * Copyright (C) 2021 Nathan Rossi <nathan.rossi@digi.com> + */ + +#include <linux/bitops.h> +#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/of.h> +#include <linux/regmap.h> + +/* INA238 register definitions */ +#define INA238_CONFIG 0x0 +#define INA238_ADC_CONFIG 0x1 +#define INA238_SHUNT_CALIBRATION 0x2 +#define SQ52206_SHUNT_TEMPCO 0x3 +#define INA238_SHUNT_VOLTAGE 0x4 +#define INA238_BUS_VOLTAGE 0x5 +#define INA238_DIE_TEMP 0x6 +#define INA238_CURRENT 0x7 +#define INA238_POWER 0x8 +#define SQ52206_ENERGY 0x9 +#define SQ52206_CHARGE 0xa +#define INA238_DIAG_ALERT 0xb +#define INA238_SHUNT_OVER_VOLTAGE 0xc +#define INA238_SHUNT_UNDER_VOLTAGE 0xd +#define INA238_BUS_OVER_VOLTAGE 0xe +#define INA238_BUS_UNDER_VOLTAGE 0xf +#define INA238_TEMP_LIMIT 0x10 +#define INA238_POWER_LIMIT 0x11 +#define SQ52206_POWER_PEAK 0x20 +#define INA238_DEVICE_ID 0x3f /* not available on INA237 */ + +#define INA238_CONFIG_ADCRANGE BIT(4) +#define SQ52206_CONFIG_ADCRANGE_HIGH BIT(4) +#define SQ52206_CONFIG_ADCRANGE_LOW BIT(3) + +#define INA238_DIAG_ALERT_TMPOL BIT(7) +#define INA238_DIAG_ALERT_SHNTOL BIT(6) +#define INA238_DIAG_ALERT_SHNTUL BIT(5) +#define INA238_DIAG_ALERT_BUSOL BIT(4) +#define INA238_DIAG_ALERT_BUSUL BIT(3) +#define INA238_DIAG_ALERT_POL BIT(2) + +#define INA238_REGISTERS 0x20 + +#define INA238_RSHUNT_DEFAULT 2500 /* uOhm */ + +/* Default configuration of device on reset. */ +#define INA238_CONFIG_DEFAULT 0 +#define SQ52206_CONFIG_DEFAULT 0x0005 +/* 16 sample averaging, 1052us conversion time, continuous mode */ +#define INA238_ADC_CONFIG_DEFAULT 0xfb6a +/* Configure alerts to be based on averaged value (SLOWALERT) */ +#define INA238_DIAG_ALERT_DEFAULT 0x2000 +#define INA238_DIAG_ALERT_APOL BIT(12) +/* + * This driver uses a fixed calibration value in order to scale current/power + * based on a fixed shunt resistor value. This allows for conversion within the + * device to avoid integer limits whilst current/power accuracy is scaled + * relative to the shunt resistor value within the driver. This is similar to + * how the ina2xx driver handles current/power scaling. + * + * To achieve the best possible dynamic range, the value of the shunt voltage + * register should match the value of the current register. With that, the shunt + * voltage of 0x7fff = 32,767 uV = 163,785 uV matches the maximum current, + * and no accuracy is lost. Experiments with a real chip show that this is + * achieved by setting the SHUNT_CAL register to a value of 0x1000 = 4,096. + * Per datasheet, + * SHUNT_CAL = 819.2 x 10^6 x CURRENT_LSB x Rshunt + * = 819,200,000 x CURRENT_LSB x Rshunt + * With SHUNT_CAL set to 4,096, we get + * CURRENT_LSB = 4,096 / (819,200,000 x Rshunt) + * Assuming an Rshunt value of 5 mOhm, we get + * CURRENT_LSB = 4,096 / (819,200,000 x 0.005) = 1mA + * and thus a dynamic range of 1mA ... 32,767mA, which is sufficient for most + * applications. The actual dynamic range is of course determined by the actual + * shunt resistor value. + * + * Power and energy values are scaled accordingly. + */ +#define INA238_CALIBRATION_VALUE 4096 +#define INA238_FIXED_SHUNT 5000 + +#define INA238_SHUNT_VOLTAGE_LSB 5000 /* 5 uV/lsb, in nV */ +#define INA238_BUS_VOLTAGE_LSB 3125000 /* 3.125 mV/lsb, in nV */ +#define SQ52206_BUS_VOLTAGE_LSB 3750000 /* 3.75 mV/lsb, in nV */ + +#define NUNIT_PER_MUNIT 1000000 /* n[AV] -> m[AV] */ + +static const struct regmap_config ina238_regmap_config = { + .max_register = INA238_REGISTERS, + .reg_bits = 8, + .val_bits = 16, +}; + +enum ina238_ids { ina228, ina237, ina238, ina700, ina780, sq52206 }; + +struct ina238_config { + bool has_20bit_voltage_current; /* vshunt, vbus and current are 20-bit fields */ + bool has_power_highest; /* chip detection power peak */ + bool has_energy; /* chip detection energy */ + u8 temp_resolution; /* temperature register resolution in bit */ + u16 config_default; /* Power-on default state */ + u32 power_calculate_factor; /* fixed parameter for power calculation, from datasheet */ + u32 bus_voltage_lsb; /* bus voltage LSB, in nV */ + int current_lsb; /* current LSB, in uA */ +}; + +struct ina238_data { + const struct ina238_config *config; + struct i2c_client *client; + struct regmap *regmap; + u32 rshunt; + int gain; + u32 voltage_lsb[2]; /* shunt, bus voltage LSB, in nV */ + int current_lsb; /* current LSB, in uA */ + int power_lsb; /* power LSB, in uW */ + int energy_lsb; /* energy LSB, in uJ */ +}; + +static const struct ina238_config ina238_config[] = { + [ina228] = { + .has_20bit_voltage_current = true, + .has_energy = true, + .has_power_highest = false, + .power_calculate_factor = 20, + .config_default = INA238_CONFIG_DEFAULT, + .bus_voltage_lsb = INA238_BUS_VOLTAGE_LSB, + .temp_resolution = 16, + }, + [ina237] = { + .has_20bit_voltage_current = false, + .has_energy = false, + .has_power_highest = false, + .power_calculate_factor = 20, + .config_default = INA238_CONFIG_DEFAULT, + .bus_voltage_lsb = INA238_BUS_VOLTAGE_LSB, + .temp_resolution = 12, + }, + [ina238] = { + .has_20bit_voltage_current = false, + .has_energy = false, + .has_power_highest = false, + .power_calculate_factor = 20, + .config_default = INA238_CONFIG_DEFAULT, + .bus_voltage_lsb = INA238_BUS_VOLTAGE_LSB, + .temp_resolution = 12, + }, + [ina700] = { + .has_20bit_voltage_current = false, + .has_energy = true, + .has_power_highest = false, + .power_calculate_factor = 20, + .config_default = INA238_CONFIG_DEFAULT, + .bus_voltage_lsb = INA238_BUS_VOLTAGE_LSB, + .temp_resolution = 12, + .current_lsb = 480, + }, + [ina780] = { + .has_20bit_voltage_current = false, + .has_energy = true, + .has_power_highest = false, + .power_calculate_factor = 20, + .config_default = INA238_CONFIG_DEFAULT, + .bus_voltage_lsb = INA238_BUS_VOLTAGE_LSB, + .temp_resolution = 12, + .current_lsb = 2400, + }, + [sq52206] = { + .has_20bit_voltage_current = false, + .has_energy = true, + .has_power_highest = true, + .power_calculate_factor = 24, + .config_default = SQ52206_CONFIG_DEFAULT, + .bus_voltage_lsb = SQ52206_BUS_VOLTAGE_LSB, + .temp_resolution = 16, + }, +}; + +static int ina238_read_reg24(const struct i2c_client *client, u8 reg, u32 *val) +{ + u8 data[3]; + int err; + + /* 24-bit register read */ + err = i2c_smbus_read_i2c_block_data(client, reg, 3, data); + if (err < 0) + return err; + if (err != 3) + return -EIO; + *val = (data[0] << 16) | (data[1] << 8) | data[2]; + + return 0; +} + +static int ina238_read_reg40(const struct i2c_client *client, u8 reg, u64 *val) +{ + u8 data[5]; + u32 low; + int err; + + /* 40-bit register read */ + err = i2c_smbus_read_i2c_block_data(client, reg, 5, data); + if (err < 0) + return err; + if (err != 5) + return -EIO; + low = (data[1] << 24) | (data[2] << 16) | (data[3] << 8) | data[4]; + *val = ((long long)data[0] << 32) | low; + + return 0; +} + +static int ina238_read_field_s20(const struct i2c_client *client, u8 reg, s32 *val) +{ + u32 regval; + int err; + + err = ina238_read_reg24(client, reg, ®val); + if (err) + return err; + + /* bits 3-0 Reserved, always zero */ + regval >>= 4; + + *val = sign_extend32(regval, 19); + + return 0; +} + +static int ina228_read_voltage(struct ina238_data *data, int channel, long *val) +{ + int reg = channel ? INA238_BUS_VOLTAGE : INA238_CURRENT; + u32 lsb = data->voltage_lsb[channel]; + u32 factor = NUNIT_PER_MUNIT; + int err, regval; + + if (data->config->has_20bit_voltage_current) { + err = ina238_read_field_s20(data->client, reg, ®val); + if (err) + return err; + /* Adjust accuracy: LSB in units of 500 pV */ + lsb /= 8; + factor *= 2; + } else { + err = regmap_read(data->regmap, reg, ®val); + if (err) + return err; + regval = (s16)regval; + } + + *val = DIV_S64_ROUND_CLOSEST((s64)regval * lsb, factor); + return 0; +} + +static int ina238_read_in(struct device *dev, u32 attr, int channel, + long *val) +{ + struct ina238_data *data = dev_get_drvdata(dev); + int reg, mask = 0; + int regval; + int err; + + if (attr == hwmon_in_input) + return ina228_read_voltage(data, channel, val); + + switch (channel) { + case 0: + switch (attr) { + case hwmon_in_max: + reg = INA238_SHUNT_OVER_VOLTAGE; + break; + case hwmon_in_min: + reg = INA238_SHUNT_UNDER_VOLTAGE; + break; + case hwmon_in_max_alarm: + reg = INA238_DIAG_ALERT; + mask = INA238_DIAG_ALERT_SHNTOL; + break; + case hwmon_in_min_alarm: + reg = INA238_DIAG_ALERT; + mask = INA238_DIAG_ALERT_SHNTUL; + break; + default: + return -EOPNOTSUPP; + } + break; + case 1: + switch (attr) { + case hwmon_in_max: + reg = INA238_BUS_OVER_VOLTAGE; + break; + case hwmon_in_min: + reg = INA238_BUS_UNDER_VOLTAGE; + break; + case hwmon_in_max_alarm: + reg = INA238_DIAG_ALERT; + mask = INA238_DIAG_ALERT_BUSOL; + break; + case hwmon_in_min_alarm: + reg = INA238_DIAG_ALERT; + mask = INA238_DIAG_ALERT_BUSUL; + break; + default: + return -EOPNOTSUPP; + } + break; + default: + return -EOPNOTSUPP; + } + + err = regmap_read(data->regmap, reg, ®val); + if (err < 0) + return err; + + if (mask) + *val = !!(regval & mask); + else + *val = DIV_S64_ROUND_CLOSEST((s64)(s16)regval * data->voltage_lsb[channel], + NUNIT_PER_MUNIT); + + return 0; +} + +static int ina238_write_in(struct device *dev, u32 attr, int channel, long val) +{ + struct ina238_data *data = dev_get_drvdata(dev); + static const int low_limits[2] = {-164, 0}; + static const int high_limits[2] = {164, 150000}; + static const u8 low_regs[2] = {INA238_SHUNT_UNDER_VOLTAGE, INA238_BUS_UNDER_VOLTAGE}; + static const u8 high_regs[2] = {INA238_SHUNT_OVER_VOLTAGE, INA238_BUS_OVER_VOLTAGE}; + int regval; + + /* Initial clamp to avoid overflows */ + val = clamp_val(val, low_limits[channel], high_limits[channel]); + val = DIV_S64_ROUND_CLOSEST((s64)val * NUNIT_PER_MUNIT, data->voltage_lsb[channel]); + /* Final clamp to register limits */ + regval = clamp_val(val, S16_MIN, S16_MAX) & 0xffff; + + switch (attr) { + case hwmon_in_min: + return regmap_write(data->regmap, low_regs[channel], regval); + case hwmon_in_max: + return regmap_write(data->regmap, high_regs[channel], regval); + default: + return -EOPNOTSUPP; + } +} + +static int __ina238_read_curr(struct ina238_data *data, long *val) +{ + u32 lsb = data->current_lsb; + int err, regval; + + if (data->config->has_20bit_voltage_current) { + err = ina238_read_field_s20(data->client, INA238_CURRENT, ®val); + if (err) + return err; + lsb /= 16; /* Adjust accuracy */ + } else { + err = regmap_read(data->regmap, INA238_CURRENT, ®val); + if (err) + return err; + regval = (s16)regval; + } + + *val = DIV_S64_ROUND_CLOSEST((s64)regval * lsb, 1000); + return 0; +} + +static int ina238_read_curr(struct device *dev, u32 attr, long *val) +{ + struct ina238_data *data = dev_get_drvdata(dev); + int reg, mask = 0; + int regval; + int err; + + if (attr == hwmon_curr_input) + return __ina238_read_curr(data, val); + + switch (attr) { + case hwmon_curr_min: + reg = INA238_SHUNT_UNDER_VOLTAGE; + break; + case hwmon_curr_min_alarm: + reg = INA238_DIAG_ALERT; + mask = INA238_DIAG_ALERT_SHNTUL; + break; + case hwmon_curr_max: + reg = INA238_SHUNT_OVER_VOLTAGE; + break; + case hwmon_curr_max_alarm: + reg = INA238_DIAG_ALERT; + mask = INA238_DIAG_ALERT_SHNTOL; + break; + default: + return -EOPNOTSUPP; + } + + err = regmap_read(data->regmap, reg, ®val); + if (err < 0) + return err; + + if (mask) + *val = !!(regval & mask); + else + *val = DIV_S64_ROUND_CLOSEST((s64)(s16)regval * data->current_lsb, 1000); + + return 0; +} + +static int ina238_write_curr(struct device *dev, u32 attr, long val) +{ + struct ina238_data *data = dev_get_drvdata(dev); + int regval; + + /* Set baseline range to avoid over/underflows */ + val = clamp_val(val, -1000000, 1000000); + /* Scale */ + val = DIV_ROUND_CLOSEST(val * 1000, data->current_lsb); + /* Clamp to register size */ + regval = clamp_val(val, S16_MIN, S16_MAX) & 0xffff; + + switch (attr) { + case hwmon_curr_min: + return regmap_write(data->regmap, INA238_SHUNT_UNDER_VOLTAGE, + regval); + case hwmon_curr_max: + return regmap_write(data->regmap, INA238_SHUNT_OVER_VOLTAGE, + regval); + default: + return -EOPNOTSUPP; + } +} + +static int ina238_read_power(struct device *dev, u32 attr, long *val) +{ + struct ina238_data *data = dev_get_drvdata(dev); + long long power; + int regval; + int err; + + switch (attr) { + case hwmon_power_input: + err = ina238_read_reg24(data->client, INA238_POWER, ®val); + if (err) + return err; + + power = (long long)regval * data->power_lsb; + /* Clamp value to maximum value of long */ + *val = clamp_val(power, 0, LONG_MAX); + break; + case hwmon_power_input_highest: + err = ina238_read_reg24(data->client, SQ52206_POWER_PEAK, ®val); + if (err) + return err; + + power = (long long)regval * data->power_lsb; + /* Clamp value to maximum value of long */ + *val = clamp_val(power, 0, LONG_MAX); + break; + case hwmon_power_max: + err = regmap_read(data->regmap, INA238_POWER_LIMIT, ®val); + if (err) + return err; + + /* + * Truncated 24-bit compare register, lower 8-bits are + * truncated. Same conversion to/from uW as POWER register. + */ + power = ((long long)regval << 8) * data->power_lsb; + /* Clamp value to maximum value of long */ + *val = clamp_val(power, 0, LONG_MAX); + break; + case hwmon_power_max_alarm: + err = regmap_read(data->regmap, INA238_DIAG_ALERT, ®val); + if (err) + return err; + + *val = !!(regval & INA238_DIAG_ALERT_POL); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int ina238_write_power_max(struct device *dev, long val) +{ + struct ina238_data *data = dev_get_drvdata(dev); + + /* + * Unsigned postive values. Compared against the 24-bit power register, + * lower 8-bits are truncated. Same conversion to/from uW as POWER + * register. + * The first clamp_val() is to establish a baseline to avoid overflows. + */ + val = clamp_val(val, 0, LONG_MAX / 2); + val = DIV_ROUND_CLOSEST(val, data->power_lsb); + val = clamp_val(val >> 8, 0, U16_MAX); + + return regmap_write(data->regmap, INA238_POWER_LIMIT, val); +} + +static int ina238_temp_from_reg(s16 regval, u8 resolution) +{ + return ((regval >> (16 - resolution)) * 1000) >> (resolution - 9); +} + +static int ina238_read_temp(struct device *dev, u32 attr, long *val) +{ + struct ina238_data *data = dev_get_drvdata(dev); + int regval; + int err; + + switch (attr) { + case hwmon_temp_input: + err = regmap_read(data->regmap, INA238_DIE_TEMP, ®val); + if (err) + return err; + *val = ina238_temp_from_reg(regval, data->config->temp_resolution); + break; + case hwmon_temp_max: + err = regmap_read(data->regmap, INA238_TEMP_LIMIT, ®val); + if (err) + return err; + /* Signed, result in mC */ + *val = ina238_temp_from_reg(regval, data->config->temp_resolution); + break; + case hwmon_temp_max_alarm: + err = regmap_read(data->regmap, INA238_DIAG_ALERT, ®val); + if (err) + return err; + + *val = !!(regval & INA238_DIAG_ALERT_TMPOL); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static u16 ina238_temp_to_reg(long val, u8 resolution) +{ + int fraction = 1000 - DIV_ROUND_CLOSEST(1000, BIT(resolution - 9)); + + val = clamp_val(val, -255000 - fraction, 255000 + fraction); + + return (DIV_ROUND_CLOSEST(val << (resolution - 9), 1000) << (16 - resolution)) & 0xffff; +} + +static int ina238_write_temp_max(struct device *dev, long val) +{ + struct ina238_data *data = dev_get_drvdata(dev); + int regval; + + regval = ina238_temp_to_reg(val, data->config->temp_resolution); + return regmap_write(data->regmap, INA238_TEMP_LIMIT, regval); +} + +static int ina238_read_energy(struct device *dev, s64 *energy) +{ + struct ina238_data *data = dev_get_drvdata(dev); + u64 regval; + int ret; + + ret = ina238_read_reg40(data->client, SQ52206_ENERGY, ®val); + if (ret) + return ret; + + /* result in uJ */ + *energy = regval * data->energy_lsb; + return 0; +} + +static int ina238_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + switch (type) { + case hwmon_in: + return ina238_read_in(dev, attr, channel, val); + case hwmon_curr: + return ina238_read_curr(dev, attr, val); + case hwmon_power: + return ina238_read_power(dev, attr, val); + case hwmon_energy64: + return ina238_read_energy(dev, (s64 *)val); + case hwmon_temp: + return ina238_read_temp(dev, attr, val); + default: + return -EOPNOTSUPP; + } + return 0; +} + +static int ina238_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + switch (type) { + case hwmon_in: + return ina238_write_in(dev, attr, channel, val); + case hwmon_curr: + return ina238_write_curr(dev, attr, val); + case hwmon_power: + return ina238_write_power_max(dev, val); + case hwmon_temp: + return ina238_write_temp_max(dev, val); + default: + return -EOPNOTSUPP; + } +} + +static umode_t ina238_is_visible(const void *drvdata, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + const struct ina238_data *data = drvdata; + bool has_power_highest = data->config->has_power_highest; + bool has_energy = data->config->has_energy; + + switch (type) { + case hwmon_in: + switch (attr) { + case hwmon_in_input: + case hwmon_in_max_alarm: + case hwmon_in_min_alarm: + return 0444; + case hwmon_in_max: + case hwmon_in_min: + return 0644; + default: + return 0; + } + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + case hwmon_curr_max_alarm: + case hwmon_curr_min_alarm: + return 0444; + case hwmon_curr_max: + case hwmon_curr_min: + return 0644; + default: + return 0; + } + case hwmon_power: + switch (attr) { + case hwmon_power_input: + case hwmon_power_max_alarm: + return 0444; + case hwmon_power_max: + return 0644; + case hwmon_power_input_highest: + if (has_power_highest) + return 0444; + return 0; + default: + return 0; + } + case hwmon_energy64: + /* hwmon_energy_input */ + if (has_energy) + return 0444; + return 0; + case hwmon_temp: + switch (attr) { + case hwmon_temp_input: + case hwmon_temp_max_alarm: + return 0444; + case hwmon_temp_max: + return 0644; + default: + return 0; + } + default: + return 0; + } +} + +#define INA238_HWMON_IN_CONFIG (HWMON_I_INPUT | \ + HWMON_I_MAX | HWMON_I_MAX_ALARM | \ + HWMON_I_MIN | HWMON_I_MIN_ALARM) + +static const struct hwmon_channel_info * const ina238_info[] = { + HWMON_CHANNEL_INFO(in, + /* 0: shunt voltage */ + INA238_HWMON_IN_CONFIG, + /* 1: bus voltage */ + INA238_HWMON_IN_CONFIG), + HWMON_CHANNEL_INFO(curr, + /* 0: current through shunt */ + HWMON_C_INPUT | HWMON_C_MIN | HWMON_C_MIN_ALARM | + HWMON_C_MAX | HWMON_C_MAX_ALARM), + HWMON_CHANNEL_INFO(power, + /* 0: power */ + HWMON_P_INPUT | HWMON_P_MAX | + HWMON_P_MAX_ALARM | HWMON_P_INPUT_HIGHEST), + HWMON_CHANNEL_INFO(energy64, + HWMON_E_INPUT), + HWMON_CHANNEL_INFO(temp, + /* 0: die temperature */ + HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_ALARM), + NULL +}; + +static const struct hwmon_ops ina238_hwmon_ops = { + .is_visible = ina238_is_visible, + .read = ina238_read, + .write = ina238_write, +}; + +static const struct hwmon_chip_info ina238_chip_info = { + .ops = &ina238_hwmon_ops, + .info = ina238_info, +}; + +static int ina238_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct device *hwmon_dev; + struct ina238_data *data; + enum ina238_ids chip; + int config; + int ret; + + chip = (uintptr_t)i2c_get_match_data(client); + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client = client; + /* set the device type */ + data->config = &ina238_config[chip]; + + data->regmap = devm_regmap_init_i2c(client, &ina238_regmap_config); + if (IS_ERR(data->regmap)) { + dev_err(dev, "failed to allocate register map\n"); + return PTR_ERR(data->regmap); + } + + /* Setup CONFIG register */ + config = data->config->config_default; + if (data->config->current_lsb) { + data->voltage_lsb[0] = INA238_SHUNT_VOLTAGE_LSB; + data->current_lsb = data->config->current_lsb; + } else { + /* load shunt value */ + if (device_property_read_u32(dev, "shunt-resistor", &data->rshunt) < 0) + data->rshunt = INA238_RSHUNT_DEFAULT; + if (data->rshunt == 0) { + dev_err(dev, "invalid shunt resister value %u\n", data->rshunt); + return -EINVAL; + } + + /* load shunt gain value */ + if (device_property_read_u32(dev, "ti,shunt-gain", &data->gain) < 0) + data->gain = 4; /* Default of ADCRANGE = 0 */ + if (data->gain != 1 && data->gain != 2 && data->gain != 4) { + dev_err(dev, "invalid shunt gain value %u\n", data->gain); + return -EINVAL; + } + + /* Setup SHUNT_CALIBRATION register with fixed value */ + ret = regmap_write(data->regmap, INA238_SHUNT_CALIBRATION, + INA238_CALIBRATION_VALUE); + if (ret < 0) { + dev_err(dev, "error configuring the device: %d\n", ret); + return -ENODEV; + } + if (chip == sq52206) { + if (data->gain == 1) /* ADCRANGE = 10/11 is /1 */ + config |= SQ52206_CONFIG_ADCRANGE_HIGH; + else if (data->gain == 2) /* ADCRANGE = 01 is /2 */ + config |= SQ52206_CONFIG_ADCRANGE_LOW; + } else if (data->gain == 1) { /* ADCRANGE = 1 is /1 */ + config |= INA238_CONFIG_ADCRANGE; + } + data->voltage_lsb[0] = INA238_SHUNT_VOLTAGE_LSB * data->gain / 4; + data->current_lsb = DIV_U64_ROUND_CLOSEST(250ULL * INA238_FIXED_SHUNT * data->gain, + data->rshunt); + } + + ret = regmap_write(data->regmap, INA238_CONFIG, config); + if (ret < 0) { + dev_err(dev, "error configuring the device: %d\n", ret); + return -ENODEV; + } + + /* Setup ADC_CONFIG register */ + ret = regmap_write(data->regmap, INA238_ADC_CONFIG, + INA238_ADC_CONFIG_DEFAULT); + if (ret < 0) { + dev_err(dev, "error configuring the device: %d\n", ret); + return -ENODEV; + } + + /* Setup alert/alarm configuration */ + config = INA238_DIAG_ALERT_DEFAULT; + if (device_property_read_bool(dev, "ti,alert-polarity-active-high")) + config |= INA238_DIAG_ALERT_APOL; + + ret = regmap_write(data->regmap, INA238_DIAG_ALERT, config); + if (ret < 0) { + dev_err(dev, "error configuring the device: %d\n", ret); + return -ENODEV; + } + + data->voltage_lsb[1] = data->config->bus_voltage_lsb; + + data->power_lsb = DIV_ROUND_CLOSEST(data->current_lsb * + data->config->power_calculate_factor, + 100); + + data->energy_lsb = data->power_lsb * 16; + + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, + &ina238_chip_info, NULL); + if (IS_ERR(hwmon_dev)) + return PTR_ERR(hwmon_dev); + + if (data->rshunt) + dev_info(dev, "power monitor %s (Rshunt = %u uOhm, gain = %u)\n", + client->name, data->rshunt, data->gain); + + return 0; +} + +static const struct i2c_device_id ina238_id[] = { + { "ina228", ina228 }, + { "ina237", ina237 }, + { "ina238", ina238 }, + { "ina700", ina700 }, + { "ina780", ina780 }, + { "sq52206", sq52206 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ina238_id); + +static const struct of_device_id __maybe_unused ina238_of_match[] = { + { + .compatible = "ti,ina228", + .data = (void *)ina228 + }, + { + .compatible = "ti,ina237", + .data = (void *)ina237 + }, + { + .compatible = "ti,ina238", + .data = (void *)ina238 + }, + { + .compatible = "ti,ina700", + .data = (void *)ina700 + }, + { + .compatible = "ti,ina780", + .data = (void *)ina780 + }, + { + .compatible = "silergy,sq52206", + .data = (void *)sq52206 + }, + { } +}; +MODULE_DEVICE_TABLE(of, ina238_of_match); + +static struct i2c_driver ina238_driver = { + .driver = { + .name = "ina238", + .of_match_table = of_match_ptr(ina238_of_match), + }, + .probe = ina238_probe, + .id_table = ina238_id, +}; + +module_i2c_driver(ina238_driver); + +MODULE_AUTHOR("Nathan Rossi <nathan.rossi@digi.com>"); +MODULE_DESCRIPTION("ina238 driver"); +MODULE_LICENSE("GPL"); |