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hwmon: (isl28022) new driver for ISL28022 power monitor
Driver for Renesas ISL28022 power monitor with I2C interface. The device monitors voltage, current via shunt resistor and calculated power. Signed-off-by: Carsten Spieß <mail@carsten-spiess.de> Signed-off-by: Yikai Tsai <yikai.tsai.wiwynn@gmail.com> Message-ID: <20241002081133.13123-3-yikai.tsai.wiwynn@gmail.com> [groeck: Fixed alignment issues, dropped noise at end of probe] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Yikai Tsai
Guenter Roeck
parent
f3bfd13c4a
commit
39671a14df
@ -96,6 +96,7 @@ Hardware Monitoring Kernel Drivers
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ir35221
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ir38064
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ir36021
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isl28022
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isl68137
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it87
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jc42
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63
Documentation/hwmon/isl28022.rst
Normal file
63
Documentation/hwmon/isl28022.rst
Normal file
@ -0,0 +1,63 @@
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.. SPDX-License-Identifier: GPL-2.0-or-later
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Kernel driver isl28022
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======================
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Supported chips:
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* Renesas ISL28022
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Prefix: 'isl28022'
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Addresses scanned: none
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Datasheet: Publicly available at the Renesas website
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https://www.renesas.com/us/en/www/doc/datasheet/isl28022.pdf
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Author:
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Carsten Spieß <mail@carsten-spiess.de>
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Description
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-----------
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The ISL28022 is a power monitor with I2C interface. The device monitors
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voltage, current via shunt resistor and calculated power.
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Usage Notes
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-----------
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This driver does not auto-detect devices. You will have to instantiate the
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device explicitly. Please see Documentation/i2c/instantiating-devices.rst for
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details.
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The shunt value in micro-ohms, shunt voltage range and averaging can be set
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with device properties.
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Please refer to the Documentation/devicetree/bindings/hwmon/isl,isl28022.yaml
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for bindings if the device tree is used.
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The driver supports only shunt and bus continuous ADC mode at 15bit resolution.
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Averaging can be set from 1 to 128 samples (power of 2) on both channels.
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Shunt voltage range of 40, 80, 160 or 320mV is allowed
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The bus voltage range is 60V fixed.
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Sysfs entries
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-------------
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The following attributes are supported. All attributes are read-only.
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======================= =======================================================
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in0_input bus voltage (milli Volt)
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curr1_input current (milli Ampere)
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power1_input power (micro Watt)
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======================= =======================================================
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Debugfs entries
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---------------
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The following attributes are supported. All attributes are read-only.
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======================= =======================================================
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shunt_voltage shunt voltage (micro Volt)
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======================= =======================================================
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@ -12109,6 +12109,8 @@ M: Carsten Spieß <mail@carsten-spiess.de>
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L: linux-hwmon@vger.kernel.org
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S: Maintained
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F: Documentation/devicetree/bindings/hwmon/renesas,isl28022.yaml
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F: Documentation/hwmon/isl28022.rst
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F: drivers/hwmon/isl28022.c
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ISOFS FILESYSTEM
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M: Jan Kara <jack@suse.cz>
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@ -855,6 +855,17 @@ config SENSORS_CORETEMP
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sensor inside your CPU. Most of the family 6 CPUs
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are supported. Check Documentation/hwmon/coretemp.rst for details.
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config SENSORS_ISL28022
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tristate "Renesas ISL28022"
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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 ISL28022 power monitor.
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Check Documentation/hwmon/isl28022.rst for details.
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This driver can also be built as a module. If so, the module
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will be called isl28022.
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config SENSORS_IT87
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tristate "ITE IT87xx and compatibles"
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depends on HAS_IOPORT
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@ -103,6 +103,7 @@ 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-$(CONFIG_SENSORS_ISL28022) += isl28022.o
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obj-$(CONFIG_SENSORS_IT87) += it87.o
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obj-$(CONFIG_SENSORS_JC42) += jc42.o
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obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o
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535
drivers/hwmon/isl28022.c
Normal file
535
drivers/hwmon/isl28022.c
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@ -0,0 +1,535 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* isl28022.c - driver for Renesas ISL28022 power monitor chip monitoring
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*
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* Copyright (c) 2023 Carsten Spieß <mail@carsten-spiess.de>
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*/
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#include <linux/debugfs.h>
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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/module.h>
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#include <linux/regmap.h>
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/* ISL28022 registers */
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#define ISL28022_REG_CONFIG 0x00
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#define ISL28022_REG_SHUNT 0x01
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#define ISL28022_REG_BUS 0x02
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#define ISL28022_REG_POWER 0x03
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#define ISL28022_REG_CURRENT 0x04
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#define ISL28022_REG_CALIB 0x05
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#define ISL28022_REG_SHUNT_THR 0x06
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#define ISL28022_REG_BUS_THR 0x07
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#define ISL28022_REG_INT 0x08
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#define ISL28022_REG_AUX 0x09
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#define ISL28022_REG_MAX ISL28022_REG_AUX
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/* ISL28022 config flags */
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/* mode flags */
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#define ISL28022_MODE_SHIFT 0
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#define ISL28022_MODE_MASK 0x0007
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#define ISL28022_MODE_PWR_DOWN 0x0
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#define ISL28022_MODE_TRG_S 0x1
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#define ISL28022_MODE_TRG_B 0x2
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#define ISL28022_MODE_TRG_SB 0x3
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#define ISL28022_MODE_ADC_OFF 0x4
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#define ISL28022_MODE_CONT_S 0x5
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#define ISL28022_MODE_CONT_B 0x6
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#define ISL28022_MODE_CONT_SB 0x7
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/* shunt ADC settings */
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#define ISL28022_SADC_SHIFT 3
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#define ISL28022_SADC_MASK 0x0078
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#define ISL28022_BADC_SHIFT 7
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#define ISL28022_BADC_MASK 0x0780
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#define ISL28022_ADC_12 0x0 /* 12 bit ADC */
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#define ISL28022_ADC_13 0x1 /* 13 bit ADC */
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#define ISL28022_ADC_14 0x2 /* 14 bit ADC */
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#define ISL28022_ADC_15 0x3 /* 15 bit ADC */
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#define ISL28022_ADC_15_1 0x8 /* 15 bit ADC, 1 sample */
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#define ISL28022_ADC_15_2 0x9 /* 15 bit ADC, 2 samples */
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#define ISL28022_ADC_15_4 0xA /* 15 bit ADC, 4 samples */
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#define ISL28022_ADC_15_8 0xB /* 15 bit ADC, 8 samples */
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#define ISL28022_ADC_15_16 0xC /* 15 bit ADC, 16 samples */
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#define ISL28022_ADC_15_32 0xD /* 15 bit ADC, 32 samples */
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#define ISL28022_ADC_15_64 0xE /* 15 bit ADC, 64 samples */
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#define ISL28022_ADC_15_128 0xF /* 15 bit ADC, 128 samples */
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/* shunt voltage range */
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#define ISL28022_PG_SHIFT 11
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#define ISL28022_PG_MASK 0x1800
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#define ISL28022_PG_40 0x0 /* +/-40 mV */
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#define ISL28022_PG_80 0x1 /* +/-80 mV */
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#define ISL28022_PG_160 0x2 /* +/-160 mV */
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#define ISL28022_PG_320 0x3 /* +/-3200 mV */
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/* bus voltage range */
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#define ISL28022_BRNG_SHIFT 13
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#define ISL28022_BRNG_MASK 0x6000
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#define ISL28022_BRNG_16 0x0 /* 16 V */
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#define ISL28022_BRNG_32 0x1 /* 32 V */
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#define ISL28022_BRNG_60 0x3 /* 60 V */
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/* reset */
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#define ISL28022_RESET 0x8000
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struct isl28022_data {
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struct regmap *regmap;
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u32 shunt;
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u32 gain;
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u32 average;
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};
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static int isl28022_read_in(struct device *dev, u32 attr, int channel, long *val)
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{
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struct isl28022_data *data = dev_get_drvdata(dev);
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unsigned int regval;
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int err;
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u16 sign_bit;
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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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err = regmap_read(data->regmap,
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ISL28022_REG_BUS, ®val);
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if (err < 0)
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return err;
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/* driver supports only 60V mode (BRNG 11) */
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*val = (long)(((u16)regval) & 0xFFFC);
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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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err = regmap_read(data->regmap,
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ISL28022_REG_SHUNT, ®val);
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if (err < 0)
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return err;
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switch (data->gain) {
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case 8:
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sign_bit = (regval >> 15) & 0x01;
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*val = (long)((((u16)regval) & 0x7FFF) -
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(sign_bit * 32768)) / 100;
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break;
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case 4:
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sign_bit = (regval >> 14) & 0x01;
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*val = (long)((((u16)regval) & 0x3FFF) -
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(sign_bit * 16384)) / 100;
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break;
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case 2:
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sign_bit = (regval >> 13) & 0x01;
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*val = (long)((((u16)regval) & 0x1FFF) -
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(sign_bit * 8192)) / 100;
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break;
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case 1:
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sign_bit = (regval >> 12) & 0x01;
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*val = (long)((((u16)regval) & 0x0FFF) -
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(sign_bit * 4096)) / 100;
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break;
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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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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 isl28022_read_current(struct device *dev, u32 attr, long *val)
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{
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struct isl28022_data *data = dev_get_drvdata(dev);
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unsigned 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,
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ISL28022_REG_CURRENT, ®val);
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if (err < 0)
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return err;
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*val = ((long)regval * 1250L * (long)data->gain) /
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(long)data->shunt;
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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 isl28022_read_power(struct device *dev, u32 attr, long *val)
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{
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struct isl28022_data *data = dev_get_drvdata(dev);
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unsigned 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 = regmap_read(data->regmap,
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ISL28022_REG_POWER, ®val);
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if (err < 0)
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return err;
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*val = ((51200000L * ((long)data->gain)) /
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(long)data->shunt) * (long)regval;
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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 isl28022_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 isl28022_read_in(dev, attr, channel, val);
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case hwmon_curr:
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return isl28022_read_current(dev, attr, val);
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case hwmon_power:
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return isl28022_read_power(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 umode_t isl28022_is_visible(const void *data, 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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return 0444;
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default:
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break;
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}
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break;
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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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break;
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}
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break;
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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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return 0444;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return 0;
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}
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static const struct hwmon_channel_info *isl28022_info[] = {
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HWMON_CHANNEL_INFO(in,
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HWMON_I_INPUT, /* channel 0: bus voltage (mV) */
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HWMON_I_INPUT), /* channel 1: shunt voltage (mV) */
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HWMON_CHANNEL_INFO(curr,
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HWMON_C_INPUT), /* channel 1: current (mA) */
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HWMON_CHANNEL_INFO(power,
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HWMON_P_INPUT), /* channel 1: power (µW) */
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NULL
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};
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static const struct hwmon_ops isl28022_hwmon_ops = {
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.is_visible = isl28022_is_visible,
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.read = isl28022_read,
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};
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static const struct hwmon_chip_info isl28022_chip_info = {
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.ops = &isl28022_hwmon_ops,
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.info = isl28022_info,
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};
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static bool isl28022_is_writeable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case ISL28022_REG_CONFIG:
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case ISL28022_REG_CALIB:
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case ISL28022_REG_SHUNT_THR:
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case ISL28022_REG_BUS_THR:
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case ISL28022_REG_INT:
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case ISL28022_REG_AUX:
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return true;
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}
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return false;
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}
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static bool isl28022_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case ISL28022_REG_CONFIG:
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case ISL28022_REG_SHUNT:
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case ISL28022_REG_BUS:
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case ISL28022_REG_POWER:
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case ISL28022_REG_CURRENT:
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case ISL28022_REG_INT:
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case ISL28022_REG_AUX:
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return true;
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}
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return true;
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}
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static const struct regmap_config isl28022_regmap_config = {
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.reg_bits = 8,
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.val_bits = 16,
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.max_register = ISL28022_REG_MAX,
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.writeable_reg = isl28022_is_writeable_reg,
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.volatile_reg = isl28022_is_volatile_reg,
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.val_format_endian = REGMAP_ENDIAN_BIG,
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.cache_type = REGCACHE_RBTREE,
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.use_single_read = true,
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.use_single_write = true,
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};
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static int shunt_voltage_show(struct seq_file *seqf, void *unused)
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{
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struct isl28022_data *data = seqf->private;
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unsigned int regval;
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int err;
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err = regmap_read(data->regmap,
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ISL28022_REG_SHUNT, ®val);
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if (err)
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return err;
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/* print shunt voltage in micro volt */
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seq_printf(seqf, "%d\n", regval * 10);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(shunt_voltage);
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static struct dentry *isl28022_debugfs_root;
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static void isl28022_debugfs_remove(void *res)
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{
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debugfs_remove_recursive(res);
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}
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static void isl28022_debugfs_init(struct i2c_client *client, struct isl28022_data *data)
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{
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char name[16];
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struct dentry *debugfs;
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scnprintf(name, sizeof(name), "%d-%04hx", client->adapter->nr, client->addr);
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debugfs = debugfs_create_dir(name, isl28022_debugfs_root);
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debugfs_create_file("shunt_voltage", 0444, debugfs, data, &shunt_voltage_fops);
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devm_add_action_or_reset(&client->dev, isl28022_debugfs_remove, debugfs);
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}
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/*
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* read property values and make consistency checks.
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*
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* following values for shunt range and resistor are allowed:
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* 40 mV -> gain 1, shunt min. 800 micro ohms
|
||||
* 80 mV -> gain 2, shunt min. 1600 micro ohms
|
||||
* 160 mV -> gain 4, shunt min. 3200 micro ohms
|
||||
* 320 mV -> gain 8, shunt min. 6400 micro ohms
|
||||
*/
|
||||
static int isl28022_read_properties(struct device *dev, struct isl28022_data *data)
|
||||
{
|
||||
u32 val;
|
||||
int err;
|
||||
|
||||
err = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val);
|
||||
if (err == -EINVAL)
|
||||
val = 10000;
|
||||
else if (err < 0)
|
||||
return err;
|
||||
data->shunt = val;
|
||||
|
||||
err = device_property_read_u32(dev, "renesas,shunt-range-microvolt", &val);
|
||||
if (err == -EINVAL)
|
||||
val = 320000;
|
||||
else if (err < 0)
|
||||
return err;
|
||||
|
||||
switch (val) {
|
||||
case 40000:
|
||||
data->gain = 1;
|
||||
if (data->shunt < 800)
|
||||
goto shunt_invalid;
|
||||
break;
|
||||
case 80000:
|
||||
data->gain = 2;
|
||||
if (data->shunt < 1600)
|
||||
goto shunt_invalid;
|
||||
break;
|
||||
case 160000:
|
||||
data->gain = 4;
|
||||
if (data->shunt < 3200)
|
||||
goto shunt_invalid;
|
||||
break;
|
||||
case 320000:
|
||||
data->gain = 8;
|
||||
if (data->shunt < 6400)
|
||||
goto shunt_invalid;
|
||||
break;
|
||||
default:
|
||||
return dev_err_probe(dev, -EINVAL,
|
||||
"renesas,shunt-range-microvolt invalid value %d\n",
|
||||
val);
|
||||
}
|
||||
|
||||
err = device_property_read_u32(dev, "renesas,average-samples", &val);
|
||||
if (err == -EINVAL)
|
||||
val = 1;
|
||||
else if (err < 0)
|
||||
return err;
|
||||
if (val > 128 || hweight32(val) != 1)
|
||||
return dev_err_probe(dev, -EINVAL,
|
||||
"renesas,average-samples invalid value %d\n",
|
||||
val);
|
||||
|
||||
data->average = val;
|
||||
|
||||
return 0;
|
||||
|
||||
shunt_invalid:
|
||||
return dev_err_probe(dev, -EINVAL,
|
||||
"renesas,shunt-resistor-microvolt invalid value %d\n",
|
||||
data->shunt);
|
||||
}
|
||||
|
||||
/*
|
||||
* write configuration and calibration registers
|
||||
*
|
||||
* The driver supports only shunt and bus continuous ADC mode at 15bit resolution
|
||||
* with averaging from 1 to 128 samples (pow of 2) on both channels.
|
||||
* Shunt voltage gain 1,2,4 or 8 is allowed.
|
||||
* The bus voltage range is 60V fixed.
|
||||
*/
|
||||
static int isl28022_config(struct isl28022_data *data)
|
||||
{
|
||||
int err;
|
||||
u16 config;
|
||||
u16 calib;
|
||||
|
||||
config = (ISL28022_MODE_CONT_SB << ISL28022_MODE_SHIFT) |
|
||||
(ISL28022_BRNG_60 << ISL28022_BRNG_SHIFT) |
|
||||
(__ffs(data->gain) << ISL28022_PG_SHIFT) |
|
||||
((ISL28022_ADC_15_1 + __ffs(data->average)) << ISL28022_SADC_SHIFT) |
|
||||
((ISL28022_ADC_15_1 + __ffs(data->average)) << ISL28022_BADC_SHIFT);
|
||||
|
||||
calib = data->shunt ? 0x8000 / data->gain : 0;
|
||||
|
||||
err = regmap_write(data->regmap, ISL28022_REG_CONFIG, config);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
return regmap_write(data->regmap, ISL28022_REG_CALIB, calib);
|
||||
}
|
||||
|
||||
static int isl28022_probe(struct i2c_client *client)
|
||||
{
|
||||
struct device *dev = &client->dev;
|
||||
struct device *hwmon_dev;
|
||||
struct isl28022_data *data;
|
||||
int err;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter,
|
||||
I2C_FUNC_SMBUS_BYTE_DATA |
|
||||
I2C_FUNC_SMBUS_WORD_DATA))
|
||||
return -ENODEV;
|
||||
|
||||
data = devm_kzalloc(dev, sizeof(struct isl28022_data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
err = isl28022_read_properties(dev, data);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
data->regmap = devm_regmap_init_i2c(client, &isl28022_regmap_config);
|
||||
if (IS_ERR(data->regmap))
|
||||
return PTR_ERR(data->regmap);
|
||||
|
||||
err = isl28022_config(data);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
isl28022_debugfs_init(client, data);
|
||||
|
||||
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
|
||||
data, &isl28022_chip_info, NULL);
|
||||
if (IS_ERR(hwmon_dev))
|
||||
return PTR_ERR(hwmon_dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id isl28022_ids[] = {
|
||||
{ "isl28022", 0},
|
||||
{ /* LIST END */ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, isl28022_ids);
|
||||
|
||||
static const struct of_device_id __maybe_unused isl28022_of_match[] = {
|
||||
{ .compatible = "renesas,isl28022"},
|
||||
{ /* LIST END */ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, isl28022_of_match);
|
||||
|
||||
static struct i2c_driver isl28022_driver = {
|
||||
.class = I2C_CLASS_HWMON,
|
||||
.driver = {
|
||||
.name = "isl28022",
|
||||
},
|
||||
.probe = isl28022_probe,
|
||||
.id_table = isl28022_ids,
|
||||
};
|
||||
|
||||
static int __init
|
||||
isl28022_init(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
isl28022_debugfs_root = debugfs_create_dir("isl28022", NULL);
|
||||
err = i2c_add_driver(&isl28022_driver);
|
||||
if (!err)
|
||||
return 0;
|
||||
|
||||
debugfs_remove_recursive(isl28022_debugfs_root);
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit
|
||||
isl28022_exit(void)
|
||||
{
|
||||
i2c_del_driver(&isl28022_driver);
|
||||
debugfs_remove_recursive(isl28022_debugfs_root);
|
||||
}
|
||||
|
||||
module_init(isl28022_init);
|
||||
module_exit(isl28022_exit);
|
||||
|
||||
MODULE_AUTHOR("Carsten Spieß <mail@carsten-spiess.de>");
|
||||
MODULE_DESCRIPTION("ISL28022 driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user