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644 lines
16 KiB
644 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Driver for Texas Instruments INA238 power monitor chip |
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* Datasheet: https://www.ti.com/product/ina238 |
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* |
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* Copyright (C) 2021 Nathan Rossi <[email protected]> |
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*/ |
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|
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#include <linux/err.h> |
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#include <linux/hwmon.h> |
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#include <linux/i2c.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/regmap.h> |
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|
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#include <linux/platform_data/ina2xx.h> |
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|
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/* INA238 register definitions */ |
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#define INA238_CONFIG 0x0 |
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#define INA238_ADC_CONFIG 0x1 |
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#define INA238_SHUNT_CALIBRATION 0x2 |
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#define INA238_SHUNT_VOLTAGE 0x4 |
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#define INA238_BUS_VOLTAGE 0x5 |
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#define INA238_DIE_TEMP 0x6 |
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#define INA238_CURRENT 0x7 |
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#define INA238_POWER 0x8 |
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#define INA238_DIAG_ALERT 0xb |
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#define INA238_SHUNT_OVER_VOLTAGE 0xc |
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#define INA238_SHUNT_UNDER_VOLTAGE 0xd |
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#define INA238_BUS_OVER_VOLTAGE 0xe |
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#define INA238_BUS_UNDER_VOLTAGE 0xf |
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#define INA238_TEMP_LIMIT 0x10 |
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#define INA238_POWER_LIMIT 0x11 |
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#define INA238_DEVICE_ID 0x3f |
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|
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#define INA238_CONFIG_ADCRANGE BIT(4) |
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#define INA238_DIAG_ALERT_TMPOL BIT(7) |
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#define INA238_DIAG_ALERT_SHNTOL BIT(6) |
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#define INA238_DIAG_ALERT_SHNTUL BIT(5) |
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#define INA238_DIAG_ALERT_BUSOL BIT(4) |
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#define INA238_DIAG_ALERT_BUSUL BIT(3) |
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#define INA238_DIAG_ALERT_POL BIT(2) |
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#define INA238_REGISTERS 0x11 |
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#define INA238_RSHUNT_DEFAULT 10000 /* uOhm */ |
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|
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/* Default configuration of device on reset. */ |
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#define INA238_CONFIG_DEFAULT 0 |
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/* 16 sample averaging, 1052us conversion time, continuous mode */ |
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#define INA238_ADC_CONFIG_DEFAULT 0xfb6a |
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/* Configure alerts to be based on averaged value (SLOWALERT) */ |
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#define INA238_DIAG_ALERT_DEFAULT 0x2000 |
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/* |
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* This driver uses a fixed calibration value in order to scale current/power |
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* based on a fixed shunt resistor value. This allows for conversion within the |
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* device to avoid integer limits whilst current/power accuracy is scaled |
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* relative to the shunt resistor value within the driver. This is similar to |
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* how the ina2xx driver handles current/power scaling. |
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* |
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* The end result of this is that increasing shunt values (from a fixed 20 mOhm |
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* shunt) increase the effective current/power accuracy whilst limiting the |
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* range and decreasing shunt values decrease the effective accuracy but |
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* increase the range. |
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* |
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* The value of the Current register is calculated given the following: |
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* Current (A) = (shunt voltage register * 5) * calibration / 81920 |
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* |
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* The maximum shunt voltage is 163.835 mV (0x7fff, ADC_RANGE = 0, gain = 4). |
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* With the maximum current value of 0x7fff and a fixed shunt value results in |
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* a calibration value of 16384 (0x4000). |
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* |
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* 0x7fff = (0x7fff * 5) * calibration / 81920 |
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* calibration = 0x4000 |
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* |
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* Equivalent calibration is applied for the Power register (maximum value for |
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* bus voltage is 102396.875 mV, 0x7fff), where the maximum power that can |
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* occur is ~16776192 uW (register value 0x147a8): |
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* |
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* This scaling means the resulting values for Current and Power registers need |
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* to be scaled by the difference between the fixed shunt resistor and the |
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* actual shunt resistor: |
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* |
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* shunt = 0x4000 / (819.2 * 10^6) / 0.001 = 20000 uOhms (with 1mA/lsb) |
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* |
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* Current (mA) = register value * 20000 / rshunt / 4 * gain |
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* Power (W) = 0.2 * register value * 20000 / rshunt / 4 * gain |
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*/ |
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#define INA238_CALIBRATION_VALUE 16384 |
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#define INA238_FIXED_SHUNT 20000 |
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#define INA238_SHUNT_VOLTAGE_LSB 5 /* 5 uV/lsb */ |
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#define INA238_BUS_VOLTAGE_LSB 3125 /* 3.125 mV/lsb */ |
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#define INA238_DIE_TEMP_LSB 125 /* 125 mC/lsb */ |
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static struct regmap_config ina238_regmap_config = { |
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.max_register = INA238_REGISTERS, |
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.reg_bits = 8, |
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.val_bits = 16, |
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}; |
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struct ina238_data { |
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struct i2c_client *client; |
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struct mutex config_lock; |
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struct regmap *regmap; |
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u32 rshunt; |
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int gain; |
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}; |
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static int ina238_read_reg24(const struct i2c_client *client, u8 reg, u32 *val) |
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{ |
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u8 data[3]; |
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int err; |
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/* 24-bit register read */ |
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err = i2c_smbus_read_i2c_block_data(client, reg, 3, data); |
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if (err < 0) |
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return err; |
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if (err != 3) |
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return -EIO; |
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*val = (data[0] << 16) | (data[1] << 8) | data[2]; |
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return 0; |
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} |
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static int ina238_read_in(struct device *dev, u32 attr, int channel, |
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long *val) |
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{ |
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struct ina238_data *data = dev_get_drvdata(dev); |
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int reg, mask; |
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int regval; |
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int err; |
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switch (channel) { |
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case 0: |
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switch (attr) { |
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case hwmon_in_input: |
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reg = INA238_SHUNT_VOLTAGE; |
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break; |
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case hwmon_in_max: |
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reg = INA238_SHUNT_OVER_VOLTAGE; |
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break; |
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case hwmon_in_min: |
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reg = INA238_SHUNT_UNDER_VOLTAGE; |
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break; |
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case hwmon_in_max_alarm: |
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reg = INA238_DIAG_ALERT; |
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mask = INA238_DIAG_ALERT_SHNTOL; |
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break; |
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case hwmon_in_min_alarm: |
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reg = INA238_DIAG_ALERT; |
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mask = INA238_DIAG_ALERT_SHNTUL; |
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break; |
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default: |
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return -EOPNOTSUPP; |
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} |
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break; |
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case 1: |
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switch (attr) { |
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case hwmon_in_input: |
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reg = INA238_BUS_VOLTAGE; |
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break; |
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case hwmon_in_max: |
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reg = INA238_BUS_OVER_VOLTAGE; |
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break; |
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case hwmon_in_min: |
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reg = INA238_BUS_UNDER_VOLTAGE; |
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break; |
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case hwmon_in_max_alarm: |
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reg = INA238_DIAG_ALERT; |
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mask = INA238_DIAG_ALERT_BUSOL; |
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break; |
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case hwmon_in_min_alarm: |
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reg = INA238_DIAG_ALERT; |
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mask = INA238_DIAG_ALERT_BUSUL; |
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break; |
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default: |
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return -EOPNOTSUPP; |
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} |
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break; |
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default: |
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return -EOPNOTSUPP; |
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} |
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err = regmap_read(data->regmap, reg, ®val); |
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if (err < 0) |
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return err; |
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switch (attr) { |
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case hwmon_in_input: |
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case hwmon_in_max: |
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case hwmon_in_min: |
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/* signed register, value in mV */ |
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regval = (s16)regval; |
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if (channel == 0) |
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/* gain of 1 -> LSB / 4 */ |
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*val = (regval * INA238_SHUNT_VOLTAGE_LSB) / |
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(1000 * (4 - data->gain + 1)); |
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else |
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*val = (regval * INA238_BUS_VOLTAGE_LSB) / 1000; |
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break; |
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case hwmon_in_max_alarm: |
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case hwmon_in_min_alarm: |
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*val = !!(regval & mask); |
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break; |
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} |
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return 0; |
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} |
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static int ina238_write_in(struct device *dev, u32 attr, int channel, |
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long val) |
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{ |
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struct ina238_data *data = dev_get_drvdata(dev); |
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int regval; |
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if (attr != hwmon_in_max && attr != hwmon_in_min) |
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return -EOPNOTSUPP; |
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/* convert decimal to register value */ |
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switch (channel) { |
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case 0: |
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/* signed value, clamp to max range +/-163 mV */ |
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regval = clamp_val(val, -163, 163); |
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regval = (regval * 1000 * (4 - data->gain + 1)) / |
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INA238_SHUNT_VOLTAGE_LSB; |
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regval = clamp_val(regval, S16_MIN, S16_MAX); |
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switch (attr) { |
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case hwmon_in_max: |
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return regmap_write(data->regmap, |
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INA238_SHUNT_OVER_VOLTAGE, regval); |
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case hwmon_in_min: |
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return regmap_write(data->regmap, |
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INA238_SHUNT_UNDER_VOLTAGE, regval); |
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default: |
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return -EOPNOTSUPP; |
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} |
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case 1: |
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/* signed value, positive values only. Clamp to max 102.396 V */ |
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regval = clamp_val(val, 0, 102396); |
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regval = (regval * 1000) / INA238_BUS_VOLTAGE_LSB; |
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regval = clamp_val(regval, 0, S16_MAX); |
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switch (attr) { |
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case hwmon_in_max: |
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return regmap_write(data->regmap, |
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INA238_BUS_OVER_VOLTAGE, regval); |
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case hwmon_in_min: |
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return regmap_write(data->regmap, |
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INA238_BUS_UNDER_VOLTAGE, regval); |
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default: |
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return -EOPNOTSUPP; |
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} |
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default: |
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return -EOPNOTSUPP; |
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} |
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} |
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static int ina238_read_current(struct device *dev, u32 attr, long *val) |
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{ |
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struct ina238_data *data = dev_get_drvdata(dev); |
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int regval; |
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int err; |
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switch (attr) { |
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case hwmon_curr_input: |
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err = regmap_read(data->regmap, INA238_CURRENT, ®val); |
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if (err < 0) |
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return err; |
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/* Signed register, fixed 1mA current lsb. result in mA */ |
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*val = div_s64((s16)regval * INA238_FIXED_SHUNT * data->gain, |
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data->rshunt * 4); |
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break; |
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default: |
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return -EOPNOTSUPP; |
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} |
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return 0; |
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} |
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static int ina238_read_power(struct device *dev, u32 attr, long *val) |
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{ |
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struct ina238_data *data = dev_get_drvdata(dev); |
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long long power; |
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int regval; |
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int err; |
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switch (attr) { |
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case hwmon_power_input: |
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err = ina238_read_reg24(data->client, INA238_POWER, ®val); |
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if (err) |
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return err; |
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/* Fixed 1mA lsb, scaled by 1000000 to have result in uW */ |
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power = div_u64(regval * 1000ULL * INA238_FIXED_SHUNT * |
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data->gain, 20 * data->rshunt); |
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/* Clamp value to maximum value of long */ |
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*val = clamp_val(power, 0, LONG_MAX); |
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break; |
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case hwmon_power_max: |
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err = regmap_read(data->regmap, INA238_POWER_LIMIT, ®val); |
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if (err) |
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return err; |
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/* |
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* Truncated 24-bit compare register, lower 8-bits are |
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* truncated. Same conversion to/from uW as POWER register. |
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*/ |
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power = div_u64((regval << 8) * 1000ULL * INA238_FIXED_SHUNT * |
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data->gain, 20 * data->rshunt); |
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/* Clamp value to maximum value of long */ |
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*val = clamp_val(power, 0, LONG_MAX); |
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break; |
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case hwmon_power_max_alarm: |
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err = regmap_read(data->regmap, INA238_DIAG_ALERT, ®val); |
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if (err) |
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return err; |
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*val = !!(regval & INA238_DIAG_ALERT_POL); |
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break; |
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default: |
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return -EOPNOTSUPP; |
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} |
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return 0; |
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} |
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static int ina238_write_power(struct device *dev, u32 attr, long val) |
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{ |
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struct ina238_data *data = dev_get_drvdata(dev); |
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long regval; |
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if (attr != hwmon_power_max) |
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return -EOPNOTSUPP; |
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/* |
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* Unsigned postive values. Compared against the 24-bit power register, |
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* lower 8-bits are truncated. Same conversion to/from uW as POWER |
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* register. |
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*/ |
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regval = clamp_val(val, 0, LONG_MAX); |
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regval = div_u64(val * 20ULL * data->rshunt, |
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1000ULL * INA238_FIXED_SHUNT * data->gain); |
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regval = clamp_val(regval >> 8, 0, U16_MAX); |
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return regmap_write(data->regmap, INA238_POWER_LIMIT, regval); |
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} |
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static int ina238_read_temp(struct device *dev, u32 attr, long *val) |
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{ |
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struct ina238_data *data = dev_get_drvdata(dev); |
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int regval; |
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int err; |
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switch (attr) { |
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case hwmon_temp_input: |
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err = regmap_read(data->regmap, INA238_DIE_TEMP, ®val); |
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if (err) |
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return err; |
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/* Signed, bits 15-4 of register, result in mC */ |
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*val = ((s16)regval >> 4) * INA238_DIE_TEMP_LSB; |
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break; |
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case hwmon_temp_max: |
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err = regmap_read(data->regmap, INA238_TEMP_LIMIT, ®val); |
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if (err) |
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return err; |
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/* Signed, bits 15-4 of register, result in mC */ |
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*val = ((s16)regval >> 4) * INA238_DIE_TEMP_LSB; |
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break; |
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case hwmon_temp_max_alarm: |
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err = regmap_read(data->regmap, INA238_DIAG_ALERT, ®val); |
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if (err) |
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return err; |
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*val = !!(regval & INA238_DIAG_ALERT_TMPOL); |
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break; |
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default: |
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return -EOPNOTSUPP; |
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} |
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return 0; |
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} |
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static int ina238_write_temp(struct device *dev, u32 attr, long val) |
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{ |
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struct ina238_data *data = dev_get_drvdata(dev); |
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int regval; |
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if (attr != hwmon_temp_max) |
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return -EOPNOTSUPP; |
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/* Signed, bits 15-4 of register */ |
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regval = (val / INA238_DIE_TEMP_LSB) << 4; |
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regval = clamp_val(regval, S16_MIN, S16_MAX) & 0xfff0; |
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return regmap_write(data->regmap, INA238_TEMP_LIMIT, regval); |
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} |
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static int ina238_read(struct device *dev, enum hwmon_sensor_types type, |
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u32 attr, int channel, long *val) |
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{ |
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switch (type) { |
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case hwmon_in: |
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return ina238_read_in(dev, attr, channel, val); |
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case hwmon_curr: |
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return ina238_read_current(dev, attr, val); |
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case hwmon_power: |
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return ina238_read_power(dev, attr, val); |
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case hwmon_temp: |
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return ina238_read_temp(dev, attr, val); |
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default: |
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return -EOPNOTSUPP; |
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} |
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return 0; |
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} |
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static int ina238_write(struct device *dev, enum hwmon_sensor_types type, |
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u32 attr, int channel, long val) |
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{ |
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struct ina238_data *data = dev_get_drvdata(dev); |
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int err; |
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mutex_lock(&data->config_lock); |
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switch (type) { |
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case hwmon_in: |
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err = ina238_write_in(dev, attr, channel, val); |
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break; |
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case hwmon_power: |
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err = ina238_write_power(dev, attr, val); |
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break; |
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case hwmon_temp: |
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err = ina238_write_temp(dev, attr, val); |
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break; |
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default: |
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err = -EOPNOTSUPP; |
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break; |
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} |
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mutex_unlock(&data->config_lock); |
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return err; |
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} |
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static umode_t ina238_is_visible(const void *drvdata, |
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enum hwmon_sensor_types type, |
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u32 attr, int channel) |
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{ |
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switch (type) { |
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case hwmon_in: |
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switch (attr) { |
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case hwmon_in_input: |
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case hwmon_in_max_alarm: |
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case hwmon_in_min_alarm: |
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return 0444; |
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case hwmon_in_max: |
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case hwmon_in_min: |
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return 0644; |
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default: |
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return 0; |
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} |
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case hwmon_curr: |
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switch (attr) { |
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case hwmon_curr_input: |
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return 0444; |
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default: |
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return 0; |
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} |
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case hwmon_power: |
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switch (attr) { |
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case hwmon_power_input: |
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case hwmon_power_max_alarm: |
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return 0444; |
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case hwmon_power_max: |
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return 0644; |
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default: |
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return 0; |
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} |
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case hwmon_temp: |
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switch (attr) { |
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case hwmon_temp_input: |
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case hwmon_temp_max_alarm: |
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return 0444; |
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case hwmon_temp_max: |
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return 0644; |
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default: |
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return 0; |
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} |
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default: |
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return 0; |
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} |
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} |
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|
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#define INA238_HWMON_IN_CONFIG (HWMON_I_INPUT | \ |
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HWMON_I_MAX | HWMON_I_MAX_ALARM | \ |
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HWMON_I_MIN | HWMON_I_MIN_ALARM) |
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|
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static const struct hwmon_channel_info *ina238_info[] = { |
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HWMON_CHANNEL_INFO(in, |
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/* 0: shunt voltage */ |
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INA238_HWMON_IN_CONFIG, |
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/* 1: bus voltage */ |
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INA238_HWMON_IN_CONFIG), |
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HWMON_CHANNEL_INFO(curr, |
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/* 0: current through shunt */ |
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HWMON_C_INPUT), |
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HWMON_CHANNEL_INFO(power, |
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/* 0: power */ |
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HWMON_P_INPUT | HWMON_P_MAX | HWMON_P_MAX_ALARM), |
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HWMON_CHANNEL_INFO(temp, |
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/* 0: die temperature */ |
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_ALARM), |
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NULL |
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}; |
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|
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static const struct hwmon_ops ina238_hwmon_ops = { |
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.is_visible = ina238_is_visible, |
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.read = ina238_read, |
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.write = ina238_write, |
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}; |
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|
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static const struct hwmon_chip_info ina238_chip_info = { |
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.ops = &ina238_hwmon_ops, |
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.info = ina238_info, |
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}; |
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|
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static int ina238_probe(struct i2c_client *client) |
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{ |
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struct ina2xx_platform_data *pdata = dev_get_platdata(&client->dev); |
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struct device *dev = &client->dev; |
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struct device *hwmon_dev; |
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struct ina238_data *data; |
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int config; |
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int ret; |
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->client = client; |
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mutex_init(&data->config_lock); |
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|
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data->regmap = devm_regmap_init_i2c(client, &ina238_regmap_config); |
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if (IS_ERR(data->regmap)) { |
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dev_err(dev, "failed to allocate register map\n"); |
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return PTR_ERR(data->regmap); |
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} |
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|
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/* load shunt value */ |
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data->rshunt = INA238_RSHUNT_DEFAULT; |
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if (device_property_read_u32(dev, "shunt-resistor", &data->rshunt) < 0 && pdata) |
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data->rshunt = pdata->shunt_uohms; |
|
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 != 4) { |
|
dev_err(dev, "invalid shunt gain value %u\n", data->gain); |
|
return -EINVAL; |
|
} |
|
|
|
/* Setup CONFIG register */ |
|
config = INA238_CONFIG_DEFAULT; |
|
if (data->gain == 1) |
|
config |= INA238_CONFIG_ADCRANGE; /* ADCRANGE = 1 is /1 */ |
|
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 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; |
|
} |
|
|
|
/* Setup alert/alarm configuration */ |
|
ret = regmap_write(data->regmap, INA238_DIAG_ALERT, |
|
INA238_DIAG_ALERT_DEFAULT); |
|
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, |
|
&ina238_chip_info, |
|
NULL); |
|
if (IS_ERR(hwmon_dev)) |
|
return PTR_ERR(hwmon_dev); |
|
|
|
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[] = { |
|
{ "ina238", 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, ina238_id); |
|
|
|
static const struct of_device_id __maybe_unused ina238_of_match[] = { |
|
{ .compatible = "ti,ina238" }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, ina238_of_match); |
|
|
|
static struct i2c_driver ina238_driver = { |
|
.class = I2C_CLASS_HWMON, |
|
.driver = { |
|
.name = "ina238", |
|
.of_match_table = of_match_ptr(ina238_of_match), |
|
}, |
|
.probe_new = ina238_probe, |
|
.id_table = ina238_id, |
|
}; |
|
|
|
module_i2c_driver(ina238_driver); |
|
|
|
MODULE_AUTHOR("Nathan Rossi <[email protected]>"); |
|
MODULE_DESCRIPTION("ina238 driver"); |
|
MODULE_LICENSE("GPL");
|
|
|