hwmon: Driver for Texas Instruments INA238
The INA238 is a I2C power monitor similar to other INA2xx devices, providing shunt voltage, bus voltage, current, power and temperature measurements. Signed-off-by: Nathan Rossi <nathan.rossi@digi.com> Link: https://lore.kernel.org/r/20211102052754.817220-3-nathan@nathanrossi.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Nathan Rossi
Guenter Roeck
Родитель
8be23b9b31
Коммит
eacb52f010
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@ -0,0 +1,56 @@
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.. SPDX-License-Identifier: GPL-2.0-only
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Kernel driver ina238
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====================
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Supported chips:
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* Texas Instruments INA238
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Prefix: 'ina238'
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Addresses: I2C 0x40 - 0x4f
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Datasheet:
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https://www.ti.com/lit/gpn/ina238
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Author: Nathan Rossi <nathan.rossi@digi.com>
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Description
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-----------
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The INA238 is a current shunt, power and temperature monitor with an I2C
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interface. It includes a number of programmable functions including alerts,
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conversion rate, sample averaging and selectable shunt voltage accuracy.
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The shunt value in micro-ohms can be set via platform data or device tree at
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compile-time or via the shunt_resistor attribute in sysfs at run-time. Please
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refer to the Documentation/devicetree/bindings/hwmon/ti,ina2xx.yaml for bindings
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if the device tree is used.
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Sysfs entries
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-------------
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======================= =======================================================
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in0_input Shunt voltage (mV)
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in0_min Minimum shunt voltage threshold (mV)
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in0_min_alarm Minimum shunt voltage alarm
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in0_max Maximum shunt voltage threshold (mV)
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in0_max_alarm Maximum shunt voltage alarm
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in1_input Bus voltage (mV)
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in1_min Minimum bus voltage threshold (mV)
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in1_min_alarm Minimum shunt voltage alarm
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in1_max Maximum bus voltage threshold (mV)
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in1_max_alarm Maximum shunt voltage alarm
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power1_input Power measurement (uW)
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power1_max Maximum power threshold (uW)
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power1_max_alarm Maximum power alarm
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curr1_input Current measurement (mA)
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temp1_input Die temperature measurement (mC)
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temp1_max Maximum die temperature threshold (mC)
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temp1_max_alarm Maximum die temperature alarm
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======================= =======================================================
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@ -76,6 +76,7 @@ Hardware Monitoring Kernel Drivers
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ibmpowernv
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ina209
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ina2xx
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ina238
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ina3221
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intel-m10-bmc-hwmon
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ir35221
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@ -1872,6 +1872,18 @@ config SENSORS_INA2XX
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This driver can also be built as a module. If so, the module
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will be called ina2xx.
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config SENSORS_INA238
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tristate "Texas Instruments INA238"
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depends on I2C
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select REGMAP_I2C
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help
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If you say yes here you get support for the INA238 power monitor
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chip. This driver supports voltage, current, power and temperature
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measurements as well as alarm configuration.
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This driver can also be built as a module. If so, the module
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will be called ina238.
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config SENSORS_INA3221
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tristate "Texas Instruments INA3221 Triple Power Monitor"
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depends on I2C
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@ -90,6 +90,7 @@ obj-$(CONFIG_SENSORS_IBMPOWERNV)+= ibmpowernv.o
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obj-$(CONFIG_SENSORS_IIO_HWMON) += iio_hwmon.o
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obj-$(CONFIG_SENSORS_INA209) += ina209.o
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obj-$(CONFIG_SENSORS_INA2XX) += ina2xx.o
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obj-$(CONFIG_SENSORS_INA238) += ina238.o
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obj-$(CONFIG_SENSORS_INA3221) += ina3221.o
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obj-$(CONFIG_SENSORS_INTEL_M10_BMC_HWMON) += intel-m10-bmc-hwmon.o
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obj-$(CONFIG_SENSORS_IT87) += it87.o
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@ -0,0 +1,644 @@
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// 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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||||
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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;
|
||||
default:
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||||
return -EOPNOTSUPP;
|
||||
}
|
||||
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||||
return 0;
|
||||
}
|
||||
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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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||||
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||||
switch (attr) {
|
||||
case hwmon_power_input:
|
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err = ina238_read_reg24(data->client, INA238_POWER, ®val);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* Fixed 1mA lsb, scaled by 1000000 to have result in uW */
|
||||
power = div_u64(regval * 1000ULL * INA238_FIXED_SHUNT *
|
||||
data->gain, 20 * data->rshunt);
|
||||
/* Clamp value to maximum value of long */
|
||||
*val = clamp_val(power, 0, LONG_MAX);
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||||
break;
|
||||
case hwmon_power_max:
|
||||
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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||||
/*
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||||
* Truncated 24-bit compare register, lower 8-bits are
|
||||
* truncated. Same conversion to/from uW as POWER register.
|
||||
*/
|
||||
power = div_u64((regval << 8) * 1000ULL * INA238_FIXED_SHUNT *
|
||||
data->gain, 20 * data->rshunt);
|
||||
/* 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)
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||||
return err;
|
||||
|
||||
*val = !!(regval & INA238_DIAG_ALERT_POL);
|
||||
break;
|
||||
default:
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ina238_write_power(struct device *dev, u32 attr, long val)
|
||||
{
|
||||
struct ina238_data *data = dev_get_drvdata(dev);
|
||||
long regval;
|
||||
|
||||
if (attr != hwmon_power_max)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
/*
|
||||
* Unsigned postive values. Compared against the 24-bit power register,
|
||||
* lower 8-bits are truncated. Same conversion to/from uW as POWER
|
||||
* register.
|
||||
*/
|
||||
regval = clamp_val(val, 0, LONG_MAX);
|
||||
regval = div_u64(val * 20ULL * data->rshunt,
|
||||
1000ULL * INA238_FIXED_SHUNT * data->gain);
|
||||
regval = clamp_val(regval >> 8, 0, U16_MAX);
|
||||
|
||||
return regmap_write(data->regmap, INA238_POWER_LIMIT, regval);
|
||||
}
|
||||
|
||||
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;
|
||||
|
||||
/* Signed, bits 15-4 of register, result in mC */
|
||||
*val = ((s16)regval >> 4) * INA238_DIE_TEMP_LSB;
|
||||
break;
|
||||
case hwmon_temp_max:
|
||||
err = regmap_read(data->regmap, INA238_TEMP_LIMIT, ®val);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* Signed, bits 15-4 of register, result in mC */
|
||||
*val = ((s16)regval >> 4) * INA238_DIE_TEMP_LSB;
|
||||
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 int ina238_write_temp(struct device *dev, u32 attr, long val)
|
||||
{
|
||||
struct ina238_data *data = dev_get_drvdata(dev);
|
||||
int regval;
|
||||
|
||||
if (attr != hwmon_temp_max)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
/* Signed, bits 15-4 of register */
|
||||
regval = (val / INA238_DIE_TEMP_LSB) << 4;
|
||||
regval = clamp_val(regval, S16_MIN, S16_MAX) & 0xfff0;
|
||||
|
||||
return regmap_write(data->regmap, INA238_TEMP_LIMIT, regval);
|
||||
}
|
||||
|
||||
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_current(dev, attr, val);
|
||||
case hwmon_power:
|
||||
return ina238_read_power(dev, attr, 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)
|
||||
{
|
||||
struct ina238_data *data = dev_get_drvdata(dev);
|
||||
int err;
|
||||
|
||||
mutex_lock(&data->config_lock);
|
||||
|
||||
switch (type) {
|
||||
case hwmon_in:
|
||||
err = ina238_write_in(dev, attr, channel, val);
|
||||
break;
|
||||
case hwmon_power:
|
||||
err = ina238_write_power(dev, attr, val);
|
||||
break;
|
||||
case hwmon_temp:
|
||||
err = ina238_write_temp(dev, attr, val);
|
||||
break;
|
||||
default:
|
||||
err = -EOPNOTSUPP;
|
||||
break;
|
||||
}
|
||||
|
||||
mutex_unlock(&data->config_lock);
|
||||
return err;
|
||||
}
|
||||
|
||||
static umode_t ina238_is_visible(const void *drvdata,
|
||||
enum hwmon_sensor_types type,
|
||||
u32 attr, int channel)
|
||||
{
|
||||
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:
|
||||
return 0444;
|
||||
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;
|
||||
default:
|
||||
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 *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_CHANNEL_INFO(power,
|
||||
/* 0: power */
|
||||
HWMON_P_INPUT | HWMON_P_MAX | HWMON_P_MAX_ALARM),
|
||||
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 ina2xx_platform_data *pdata = dev_get_platdata(&client->dev);
|
||||
struct device *dev = &client->dev;
|
||||
struct device *hwmon_dev;
|
||||
struct ina238_data *data;
|
||||
int config;
|
||||
int ret;
|
||||
|
||||
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
data->client = client;
|
||||
mutex_init(&data->config_lock);
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
/* load shunt value */
|
||||
data->rshunt = INA238_RSHUNT_DEFAULT;
|
||||
if (device_property_read_u32(dev, "shunt-resistor", &data->rshunt) < 0 && pdata)
|
||||
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 <nathan.rossi@digi.com>");
|
||||
MODULE_DESCRIPTION("ina238 driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Загрузка…
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