645 lines
16 KiB
C
645 lines
16 KiB
C
// 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 <nathan.rossi@digi.com>
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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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#include <linux/platform_data/ina2xx.h>
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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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#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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/* 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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#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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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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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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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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|
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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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|
|
|
/* 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;
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if (data->rshunt == 0) {
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dev_err(dev, "invalid shunt resister value %u\n", data->rshunt);
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return -EINVAL;
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}
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|
|
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/* load shunt gain value */
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if (device_property_read_u32(dev, "ti,shunt-gain", &data->gain) < 0)
|
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data->gain = 4; /* Default of ADCRANGE = 0 */
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if (data->gain != 1 && data->gain != 4) {
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dev_err(dev, "invalid shunt gain value %u\n", data->gain);
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|
return -EINVAL;
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|
}
|
|
|
|
/* Setup CONFIG register */
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config = INA238_CONFIG_DEFAULT;
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if (data->gain == 1)
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config |= INA238_CONFIG_ADCRANGE; /* ADCRANGE = 1 is /1 */
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ret = regmap_write(data->regmap, INA238_CONFIG, config);
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|
if (ret < 0) {
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dev_err(dev, "error configuring the device: %d\n", ret);
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|
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);
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|
return -ENODEV;
|
|
}
|
|
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|
/* 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 <nathan.rossi@digi.com>");
|
|
MODULE_DESCRIPTION("ina238 driver");
|
|
MODULE_LICENSE("GPL");
|