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hwmon: Driver for Texas Instruments INA209
Add support for the TI / Burr-Brown INA209 voltage / current / power monitor. Cc: Paul Hays <haysp@magma.net> Cc: Ira W. Snyder <iws@ovro.caltech.edu> Tested-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck
parent
2bf9233a10
commit
ceeadc5c51
18
Documentation/devicetree/bindings/i2c/ina209.txt
Normal file
18
Documentation/devicetree/bindings/i2c/ina209.txt
Normal file
@ -0,0 +1,18 @@
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ina209 properties
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Required properties:
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- compatible: Must be "ti,ina209"
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- reg: I2C address
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Optional properties:
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- shunt-resistor
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Shunt resistor value in micro-Ohm
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Example:
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temp-sensor@4c {
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compatible = "ti,ina209";
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reg = <0x4c>;
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shunt-resistor = <5000>;
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};
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93
Documentation/hwmon/ina209
Normal file
93
Documentation/hwmon/ina209
Normal file
@ -0,0 +1,93 @@
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Kernel driver ina209
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=====================
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Supported chips:
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* Burr-Brown / Texas Instruments INA209
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Prefix: 'ina209'
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Addresses scanned: -
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Datasheet:
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http://www.ti.com/lit/gpn/ina209
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Author: Paul Hays <Paul.Hays@cattail.ca>
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Author: Ira W. Snyder <iws@ovro.caltech.edu>
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Author: Guenter Roeck <linux@roeck-us.net>
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Description
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-----------
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The TI / Burr-Brown INA209 monitors voltage, current, and power on the high side
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of a D.C. power supply. It can perform measurements and calculations in the
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background to supply readings at any time. It includes a programmable
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calibration multiplier to scale the displayed current and power values.
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Sysfs entries
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-------------
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The INA209 chip is highly configurable both via hardwiring and via
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the I2C bus. See the datasheet for details.
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This tries to expose most monitoring features of the hardware via
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sysfs. It does not support every feature of this chip.
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in0_input shunt voltage (mV)
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in0_input_highest shunt voltage historical maximum reading (mV)
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in0_input_lowest shunt voltage historical minimum reading (mV)
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in0_reset_history reset shunt voltage history
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in0_max shunt voltage max alarm limit (mV)
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in0_min shunt voltage min alarm limit (mV)
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in0_crit_max shunt voltage crit max alarm limit (mV)
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in0_crit_min shunt voltage crit min alarm limit (mV)
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in0_max_alarm shunt voltage max alarm limit exceeded
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in0_min_alarm shunt voltage min alarm limit exceeded
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in0_crit_max_alarm shunt voltage crit max alarm limit exceeded
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in0_crit_min_alarm shunt voltage crit min alarm limit exceeded
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in1_input bus voltage (mV)
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in1_input_highest bus voltage historical maximum reading (mV)
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in1_input_lowest bus voltage historical minimum reading (mV)
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in1_reset_history reset bus voltage history
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in1_max bus voltage max alarm limit (mV)
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in1_min bus voltage min alarm limit (mV)
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in1_crit_max bus voltage crit max alarm limit (mV)
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in1_crit_min bus voltage crit min alarm limit (mV)
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in1_max_alarm bus voltage max alarm limit exceeded
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in1_min_alarm bus voltage min alarm limit exceeded
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in1_crit_max_alarm bus voltage crit max alarm limit exceeded
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in1_crit_min_alarm bus voltage crit min alarm limit exceeded
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power1_input power measurement (uW)
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power1_input_highest power historical maximum reading (uW)
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power1_reset_history reset power history
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power1_max power max alarm limit (uW)
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power1_crit power crit alarm limit (uW)
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power1_max_alarm power max alarm limit exceeded
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power1_crit_alarm power crit alarm limit exceeded
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curr1_input current measurement (mA)
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update_interval data conversion time; affects number of samples used
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to average results for shunt and bus voltages.
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General Remarks
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---------------
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The power and current registers in this chip require that the calibration
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register is programmed correctly before they are used. Normally this is expected
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to be done in the BIOS. In the absence of BIOS programming, the shunt resistor
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voltage can be provided using platform data. The driver uses platform data from
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the ina2xx driver for this purpose. If calibration register data is not provided
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via platform data, the driver checks if the calibration register has been
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programmed (ie has a value not equal to zero). If so, this value is retained.
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Otherwise, a default value reflecting a shunt resistor value of 10 mOhm is
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programmed into the calibration register.
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Output Pins
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-----------
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Output pin programming is a board feature which depends on the BIOS. It is
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outside the scope of a hardware monitoring driver to enable or disable output
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pins.
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@ -1157,6 +1157,16 @@ config SENSORS_AMC6821
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This driver can also be build as a module. If so, the module
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will be called amc6821.
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config SENSORS_INA209
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tristate "TI / Burr Brown INA209"
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depends on I2C
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help
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If you say yes here you get support for the TI / Burr Brown INA209
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voltage / current / power monitor I2C interface.
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This driver can also be built as a module. If so, the module will
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be called ina209.
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config SENSORS_INA2XX
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tristate "Texas Instruments INA219 and compatibles"
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depends on I2C
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@ -65,6 +65,7 @@ obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
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obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
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obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
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obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.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-$(CONFIG_SENSORS_IT87) += it87.o
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obj-$(CONFIG_SENSORS_JC42) += jc42.o
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636
drivers/hwmon/ina209.c
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636
drivers/hwmon/ina209.c
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@ -0,0 +1,636 @@
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/*
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* Driver for the Texas Instruments / Burr Brown INA209
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* Bidirectional Current/Power Monitor
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*
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* Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net>
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*
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* Derived from Ira W. Snyder's original driver submission
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* Copyright (C) 2008 Paul Hays <Paul.Hays@cattail.ca>
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* Copyright (C) 2008-2009 Ira W. Snyder <iws@ovro.caltech.edu>
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*
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* Aligned with ina2xx driver
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* Copyright (C) 2012 Lothar Felten <l-felten@ti.com>
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* Thanks to Jan Volkering
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* Datasheet:
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* http://www.ti.com/lit/gpn/ina209
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/bug.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/platform_data/ina2xx.h>
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/* register definitions */
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#define INA209_CONFIGURATION 0x00
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#define INA209_STATUS 0x01
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#define INA209_STATUS_MASK 0x02
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#define INA209_SHUNT_VOLTAGE 0x03
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#define INA209_BUS_VOLTAGE 0x04
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#define INA209_POWER 0x05
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#define INA209_CURRENT 0x06
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#define INA209_SHUNT_VOLTAGE_POS_PEAK 0x07
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#define INA209_SHUNT_VOLTAGE_NEG_PEAK 0x08
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#define INA209_BUS_VOLTAGE_MAX_PEAK 0x09
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#define INA209_BUS_VOLTAGE_MIN_PEAK 0x0a
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#define INA209_POWER_PEAK 0x0b
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#define INA209_SHUNT_VOLTAGE_POS_WARN 0x0c
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#define INA209_SHUNT_VOLTAGE_NEG_WARN 0x0d
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#define INA209_POWER_WARN 0x0e
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#define INA209_BUS_VOLTAGE_OVER_WARN 0x0f
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#define INA209_BUS_VOLTAGE_UNDER_WARN 0x10
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#define INA209_POWER_OVER_LIMIT 0x11
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#define INA209_BUS_VOLTAGE_OVER_LIMIT 0x12
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#define INA209_BUS_VOLTAGE_UNDER_LIMIT 0x13
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#define INA209_CRITICAL_DAC_POS 0x14
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#define INA209_CRITICAL_DAC_NEG 0x15
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#define INA209_CALIBRATION 0x16
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#define INA209_REGISTERS 0x17
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#define INA209_CONFIG_DEFAULT 0x3c47 /* PGA=8, full range */
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#define INA209_SHUNT_DEFAULT 10000 /* uOhm */
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struct ina209_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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bool valid;
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unsigned long last_updated; /* in jiffies */
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u16 regs[INA209_REGISTERS]; /* All chip registers */
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u16 config_orig; /* Original configuration */
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u16 calibration_orig; /* Original calibration */
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u16 update_interval;
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};
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static struct ina209_data *ina209_update_device(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ina209_data *data = i2c_get_clientdata(client);
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struct ina209_data *ret = data;
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s32 val;
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int i;
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mutex_lock(&data->update_lock);
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if (!data->valid ||
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time_after(jiffies, data->last_updated + data->update_interval)) {
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for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
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val = i2c_smbus_read_word_swapped(client, i);
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if (val < 0) {
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ret = ERR_PTR(val);
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goto abort;
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}
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data->regs[i] = val;
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}
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data->last_updated = jiffies;
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data->valid = true;
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}
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abort:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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/*
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* Read a value from a device register and convert it to the
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* appropriate sysfs units
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*/
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static long ina209_from_reg(const u8 reg, const u16 val)
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{
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switch (reg) {
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case INA209_SHUNT_VOLTAGE:
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case INA209_SHUNT_VOLTAGE_POS_PEAK:
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case INA209_SHUNT_VOLTAGE_NEG_PEAK:
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case INA209_SHUNT_VOLTAGE_POS_WARN:
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case INA209_SHUNT_VOLTAGE_NEG_WARN:
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/* LSB=10 uV. Convert to mV. */
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return DIV_ROUND_CLOSEST(val, 100);
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case INA209_BUS_VOLTAGE:
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case INA209_BUS_VOLTAGE_MAX_PEAK:
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case INA209_BUS_VOLTAGE_MIN_PEAK:
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case INA209_BUS_VOLTAGE_OVER_WARN:
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case INA209_BUS_VOLTAGE_UNDER_WARN:
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case INA209_BUS_VOLTAGE_OVER_LIMIT:
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case INA209_BUS_VOLTAGE_UNDER_LIMIT:
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/* LSB=4 mV, last 3 bits unused */
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return (val >> 3) * 4;
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case INA209_CRITICAL_DAC_POS:
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/* LSB=1 mV, in the upper 8 bits */
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return val >> 8;
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case INA209_CRITICAL_DAC_NEG:
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/* LSB=1 mV, in the upper 8 bits */
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return -1 * (val >> 8);
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case INA209_POWER:
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case INA209_POWER_PEAK:
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case INA209_POWER_WARN:
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case INA209_POWER_OVER_LIMIT:
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/* LSB=20 mW. Convert to uW */
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return val * 20 * 1000L;
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case INA209_CURRENT:
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/* LSB=1 mA (selected). Is in mA */
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return val;
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}
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/* programmer goofed */
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WARN_ON_ONCE(1);
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return 0;
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}
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/*
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* Take a value and convert it to register format, clamping the value
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* to the appropriate range.
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*/
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static int ina209_to_reg(u8 reg, u16 old, long val)
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{
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switch (reg) {
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case INA209_SHUNT_VOLTAGE_POS_WARN:
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case INA209_SHUNT_VOLTAGE_NEG_WARN:
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/* Limit to +- 320 mV, 10 uV LSB */
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return clamp_val(val, -320, 320) * 100;
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case INA209_BUS_VOLTAGE_OVER_WARN:
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case INA209_BUS_VOLTAGE_UNDER_WARN:
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case INA209_BUS_VOLTAGE_OVER_LIMIT:
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case INA209_BUS_VOLTAGE_UNDER_LIMIT:
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/*
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* Limit to 0-32000 mV, 4 mV LSB
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*
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* The last three bits aren't part of the value, but we'll
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* preserve them in their original state.
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*/
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return (DIV_ROUND_CLOSEST(clamp_val(val, 0, 32000), 4) << 3)
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| (old & 0x7);
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case INA209_CRITICAL_DAC_NEG:
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/*
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* Limit to -255-0 mV, 1 mV LSB
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* Convert the value to a positive value for the register
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*
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* The value lives in the top 8 bits only, be careful
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* and keep original value of other bits.
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*/
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return (clamp_val(-val, 0, 255) << 8) | (old & 0xff);
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case INA209_CRITICAL_DAC_POS:
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/*
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* Limit to 0-255 mV, 1 mV LSB
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*
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* The value lives in the top 8 bits only, be careful
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* and keep original value of other bits.
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*/
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return (clamp_val(val, 0, 255) << 8) | (old & 0xff);
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case INA209_POWER_WARN:
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case INA209_POWER_OVER_LIMIT:
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/* 20 mW LSB */
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return DIV_ROUND_CLOSEST(val, 20 * 1000);
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}
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/* Other registers are read-only, return access error */
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return -EACCES;
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}
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static int ina209_interval_from_reg(u16 reg)
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{
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return 68 >> (15 - ((reg >> 3) & 0x0f));
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}
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static u16 ina209_reg_from_interval(u16 config, long interval)
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{
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int i, adc;
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if (interval <= 0) {
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adc = 8;
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} else {
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adc = 15;
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for (i = 34 + 34 / 2; i; i >>= 1) {
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if (i < interval)
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break;
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adc--;
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}
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}
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return (config & 0xf807) | (adc << 3) | (adc << 7);
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}
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static ssize_t ina209_set_interval(struct device *dev,
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struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ina209_data *data = ina209_update_device(dev);
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long val;
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u16 regval;
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int ret;
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if (IS_ERR(data))
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return PTR_ERR(data);
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ret = kstrtol(buf, 10, &val);
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if (ret < 0)
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return ret;
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mutex_lock(&data->update_lock);
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regval = ina209_reg_from_interval(data->regs[INA209_CONFIGURATION],
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val);
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i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION, regval);
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data->regs[INA209_CONFIGURATION] = regval;
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data->update_interval = ina209_interval_from_reg(regval);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t ina209_show_interval(struct device *dev,
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struct device_attribute *da, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ina209_data *data = i2c_get_clientdata(client);
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return snprintf(buf, PAGE_SIZE, "%d\n", data->update_interval);
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}
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/*
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* History is reset by writing 1 into bit 0 of the respective peak register.
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* Since more than one peak register may be affected by the scope of a
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* reset_history attribute write, use a bit mask in attr->index to identify
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* which registers are affected.
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*/
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static u16 ina209_reset_history_regs[] = {
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INA209_SHUNT_VOLTAGE_POS_PEAK,
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INA209_SHUNT_VOLTAGE_NEG_PEAK,
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INA209_BUS_VOLTAGE_MAX_PEAK,
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INA209_BUS_VOLTAGE_MIN_PEAK,
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INA209_POWER_PEAK
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};
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static ssize_t ina209_reset_history(struct device *dev,
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struct device_attribute *da,
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const char *buf,
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size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ina209_data *data = i2c_get_clientdata(client);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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u32 mask = attr->index;
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long val;
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int i, ret;
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ret = kstrtol(buf, 10, &val);
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if (ret < 0)
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return ret;
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mutex_lock(&data->update_lock);
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for (i = 0; i < ARRAY_SIZE(ina209_reset_history_regs); i++) {
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if (mask & (1 << i))
|
||||
i2c_smbus_write_word_swapped(client,
|
||||
ina209_reset_history_regs[i], 1);
|
||||
}
|
||||
data->valid = false;
|
||||
mutex_unlock(&data->update_lock);
|
||||
return count;
|
||||
}
|
||||
|
||||
static ssize_t ina209_set_value(struct device *dev,
|
||||
struct device_attribute *da,
|
||||
const char *buf,
|
||||
size_t count)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
struct ina209_data *data = ina209_update_device(dev);
|
||||
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
||||
int reg = attr->index;
|
||||
long val;
|
||||
int ret;
|
||||
|
||||
if (IS_ERR(data))
|
||||
return PTR_ERR(data);
|
||||
|
||||
ret = kstrtol(buf, 10, &val);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
mutex_lock(&data->update_lock);
|
||||
ret = ina209_to_reg(reg, data->regs[reg], val);
|
||||
if (ret < 0) {
|
||||
count = ret;
|
||||
goto abort;
|
||||
}
|
||||
i2c_smbus_write_word_swapped(client, reg, ret);
|
||||
data->regs[reg] = ret;
|
||||
abort:
|
||||
mutex_unlock(&data->update_lock);
|
||||
return count;
|
||||
}
|
||||
|
||||
static ssize_t ina209_show_value(struct device *dev,
|
||||
struct device_attribute *da,
|
||||
char *buf)
|
||||
{
|
||||
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
||||
struct ina209_data *data = ina209_update_device(dev);
|
||||
long val;
|
||||
|
||||
if (IS_ERR(data))
|
||||
return PTR_ERR(data);
|
||||
|
||||
val = ina209_from_reg(attr->index, data->regs[attr->index]);
|
||||
return snprintf(buf, PAGE_SIZE, "%ld\n", val);
|
||||
}
|
||||
|
||||
static ssize_t ina209_show_alarm(struct device *dev,
|
||||
struct device_attribute *da,
|
||||
char *buf)
|
||||
{
|
||||
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
||||
struct ina209_data *data = ina209_update_device(dev);
|
||||
const unsigned int mask = attr->index;
|
||||
u16 status;
|
||||
|
||||
if (IS_ERR(data))
|
||||
return PTR_ERR(data);
|
||||
|
||||
status = data->regs[INA209_STATUS];
|
||||
|
||||
/*
|
||||
* All alarms are in the INA209_STATUS register. To avoid a long
|
||||
* switch statement, the mask is passed in attr->index
|
||||
*/
|
||||
return snprintf(buf, PAGE_SIZE, "%u\n", !!(status & mask));
|
||||
}
|
||||
|
||||
/* Shunt voltage, history, limits, alarms */
|
||||
static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina209_show_value, NULL,
|
||||
INA209_SHUNT_VOLTAGE);
|
||||
static SENSOR_DEVICE_ATTR(in0_input_highest, S_IRUGO, ina209_show_value, NULL,
|
||||
INA209_SHUNT_VOLTAGE_POS_PEAK);
|
||||
static SENSOR_DEVICE_ATTR(in0_input_lowest, S_IRUGO, ina209_show_value, NULL,
|
||||
INA209_SHUNT_VOLTAGE_NEG_PEAK);
|
||||
static SENSOR_DEVICE_ATTR(in0_reset_history, S_IWUSR, NULL,
|
||||
ina209_reset_history, (1 << 0) | (1 << 1));
|
||||
static SENSOR_DEVICE_ATTR(in0_max, S_IRUGO | S_IWUSR, ina209_show_value,
|
||||
ina209_set_value, INA209_SHUNT_VOLTAGE_POS_WARN);
|
||||
static SENSOR_DEVICE_ATTR(in0_min, S_IRUGO | S_IWUSR, ina209_show_value,
|
||||
ina209_set_value, INA209_SHUNT_VOLTAGE_NEG_WARN);
|
||||
static SENSOR_DEVICE_ATTR(in0_crit_max, S_IRUGO | S_IWUSR, ina209_show_value,
|
||||
ina209_set_value, INA209_CRITICAL_DAC_POS);
|
||||
static SENSOR_DEVICE_ATTR(in0_crit_min, S_IRUGO | S_IWUSR, ina209_show_value,
|
||||
ina209_set_value, INA209_CRITICAL_DAC_NEG);
|
||||
|
||||
static SENSOR_DEVICE_ATTR(in0_min_alarm, S_IRUGO, ina209_show_alarm, NULL,
|
||||
1 << 11);
|
||||
static SENSOR_DEVICE_ATTR(in0_max_alarm, S_IRUGO, ina209_show_alarm, NULL,
|
||||
1 << 12);
|
||||
static SENSOR_DEVICE_ATTR(in0_crit_min_alarm, S_IRUGO, ina209_show_alarm, NULL,
|
||||
1 << 6);
|
||||
static SENSOR_DEVICE_ATTR(in0_crit_max_alarm, S_IRUGO, ina209_show_alarm, NULL,
|
||||
1 << 7);
|
||||
|
||||
/* Bus voltage, history, limits, alarms */
|
||||
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina209_show_value, NULL,
|
||||
INA209_BUS_VOLTAGE);
|
||||
static SENSOR_DEVICE_ATTR(in1_input_highest, S_IRUGO, ina209_show_value, NULL,
|
||||
INA209_BUS_VOLTAGE_MAX_PEAK);
|
||||
static SENSOR_DEVICE_ATTR(in1_input_lowest, S_IRUGO, ina209_show_value, NULL,
|
||||
INA209_BUS_VOLTAGE_MIN_PEAK);
|
||||
static SENSOR_DEVICE_ATTR(in1_reset_history, S_IWUSR, NULL,
|
||||
ina209_reset_history, (1 << 2) | (1 << 3));
|
||||
static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR, ina209_show_value,
|
||||
ina209_set_value, INA209_BUS_VOLTAGE_OVER_WARN);
|
||||
static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR, ina209_show_value,
|
||||
ina209_set_value, INA209_BUS_VOLTAGE_UNDER_WARN);
|
||||
static SENSOR_DEVICE_ATTR(in1_crit_max, S_IRUGO | S_IWUSR, ina209_show_value,
|
||||
ina209_set_value, INA209_BUS_VOLTAGE_OVER_LIMIT);
|
||||
static SENSOR_DEVICE_ATTR(in1_crit_min, S_IRUGO | S_IWUSR, ina209_show_value,
|
||||
ina209_set_value, INA209_BUS_VOLTAGE_UNDER_LIMIT);
|
||||
|
||||
static SENSOR_DEVICE_ATTR(in1_min_alarm, S_IRUGO, ina209_show_alarm, NULL,
|
||||
1 << 14);
|
||||
static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ina209_show_alarm, NULL,
|
||||
1 << 15);
|
||||
static SENSOR_DEVICE_ATTR(in1_crit_min_alarm, S_IRUGO, ina209_show_alarm, NULL,
|
||||
1 << 9);
|
||||
static SENSOR_DEVICE_ATTR(in1_crit_max_alarm, S_IRUGO, ina209_show_alarm, NULL,
|
||||
1 << 10);
|
||||
|
||||
/* Power */
|
||||
static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina209_show_value, NULL,
|
||||
INA209_POWER);
|
||||
static SENSOR_DEVICE_ATTR(power1_input_highest, S_IRUGO, ina209_show_value,
|
||||
NULL, INA209_POWER_PEAK);
|
||||
static SENSOR_DEVICE_ATTR(power1_reset_history, S_IWUSR, NULL,
|
||||
ina209_reset_history, 1 << 4);
|
||||
static SENSOR_DEVICE_ATTR(power1_max, S_IRUGO | S_IWUSR, ina209_show_value,
|
||||
ina209_set_value, INA209_POWER_WARN);
|
||||
static SENSOR_DEVICE_ATTR(power1_crit, S_IRUGO | S_IWUSR, ina209_show_value,
|
||||
ina209_set_value, INA209_POWER_OVER_LIMIT);
|
||||
|
||||
static SENSOR_DEVICE_ATTR(power1_max_alarm, S_IRUGO, ina209_show_alarm, NULL,
|
||||
1 << 13);
|
||||
static SENSOR_DEVICE_ATTR(power1_crit_alarm, S_IRUGO, ina209_show_alarm, NULL,
|
||||
1 << 8);
|
||||
|
||||
/* Current */
|
||||
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina209_show_value, NULL,
|
||||
INA209_CURRENT);
|
||||
|
||||
static SENSOR_DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR,
|
||||
ina209_show_interval, ina209_set_interval, 0);
|
||||
|
||||
/*
|
||||
* Finally, construct an array of pointers to members of the above objects,
|
||||
* as required for sysfs_create_group()
|
||||
*/
|
||||
static struct attribute *ina209_attributes[] = {
|
||||
&sensor_dev_attr_in0_input.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_input_highest.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_input_lowest.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_reset_history.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_max.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_min.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_crit_max.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_crit_min.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_max_alarm.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_min_alarm.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_crit_max_alarm.dev_attr.attr,
|
||||
&sensor_dev_attr_in0_crit_min_alarm.dev_attr.attr,
|
||||
|
||||
&sensor_dev_attr_in1_input.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_input_highest.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_input_lowest.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_reset_history.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_max.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_min.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_crit_max.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_crit_min.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_max_alarm.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_min_alarm.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_crit_max_alarm.dev_attr.attr,
|
||||
&sensor_dev_attr_in1_crit_min_alarm.dev_attr.attr,
|
||||
|
||||
&sensor_dev_attr_power1_input.dev_attr.attr,
|
||||
&sensor_dev_attr_power1_input_highest.dev_attr.attr,
|
||||
&sensor_dev_attr_power1_reset_history.dev_attr.attr,
|
||||
&sensor_dev_attr_power1_max.dev_attr.attr,
|
||||
&sensor_dev_attr_power1_crit.dev_attr.attr,
|
||||
&sensor_dev_attr_power1_max_alarm.dev_attr.attr,
|
||||
&sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
|
||||
|
||||
&sensor_dev_attr_curr1_input.dev_attr.attr,
|
||||
|
||||
&sensor_dev_attr_update_interval.dev_attr.attr,
|
||||
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group ina209_group = {
|
||||
.attrs = ina209_attributes,
|
||||
};
|
||||
|
||||
static void ina209_restore_conf(struct i2c_client *client,
|
||||
struct ina209_data *data)
|
||||
{
|
||||
/* Restore initial configuration */
|
||||
i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
|
||||
data->config_orig);
|
||||
i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
|
||||
data->calibration_orig);
|
||||
}
|
||||
|
||||
static int ina209_init_client(struct i2c_client *client,
|
||||
struct ina209_data *data)
|
||||
{
|
||||
struct ina2xx_platform_data *pdata = dev_get_platdata(&client->dev);
|
||||
u32 shunt;
|
||||
int reg;
|
||||
|
||||
reg = i2c_smbus_read_word_swapped(client, INA209_CALIBRATION);
|
||||
if (reg < 0)
|
||||
return reg;
|
||||
data->calibration_orig = reg;
|
||||
|
||||
reg = i2c_smbus_read_word_swapped(client, INA209_CONFIGURATION);
|
||||
if (reg < 0)
|
||||
return reg;
|
||||
data->config_orig = reg;
|
||||
|
||||
if (pdata) {
|
||||
if (pdata->shunt_uohms <= 0)
|
||||
return -EINVAL;
|
||||
shunt = pdata->shunt_uohms;
|
||||
} else if (!of_property_read_u32(client->dev.of_node, "shunt-resistor",
|
||||
&shunt)) {
|
||||
if (shunt == 0)
|
||||
return -EINVAL;
|
||||
} else {
|
||||
shunt = data->calibration_orig ?
|
||||
40960000 / data->calibration_orig : INA209_SHUNT_DEFAULT;
|
||||
}
|
||||
|
||||
i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
|
||||
INA209_CONFIG_DEFAULT);
|
||||
data->update_interval = ina209_interval_from_reg(INA209_CONFIG_DEFAULT);
|
||||
|
||||
/*
|
||||
* Calibrate current LSB to 1mA. Shunt is in uOhms.
|
||||
* See equation 13 in datasheet.
|
||||
*/
|
||||
i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
|
||||
clamp_val(40960000 / shunt, 1, 65535));
|
||||
|
||||
/* Clear status register */
|
||||
i2c_smbus_read_word_swapped(client, INA209_STATUS);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ina209_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct i2c_adapter *adapter = client->adapter;
|
||||
struct ina209_data *data;
|
||||
int ret;
|
||||
|
||||
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
|
||||
return -ENODEV;
|
||||
|
||||
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
i2c_set_clientdata(client, data);
|
||||
mutex_init(&data->update_lock);
|
||||
|
||||
ret = ina209_init_client(client, data);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Register sysfs hooks */
|
||||
ret = sysfs_create_group(&client->dev.kobj, &ina209_group);
|
||||
if (ret)
|
||||
goto out_restore_conf;
|
||||
|
||||
data->hwmon_dev = hwmon_device_register(&client->dev);
|
||||
if (IS_ERR(data->hwmon_dev)) {
|
||||
ret = PTR_ERR(data->hwmon_dev);
|
||||
goto out_hwmon_device_register;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out_hwmon_device_register:
|
||||
sysfs_remove_group(&client->dev.kobj, &ina209_group);
|
||||
out_restore_conf:
|
||||
ina209_restore_conf(client, data);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ina209_remove(struct i2c_client *client)
|
||||
{
|
||||
struct ina209_data *data = i2c_get_clientdata(client);
|
||||
|
||||
hwmon_device_unregister(data->hwmon_dev);
|
||||
sysfs_remove_group(&client->dev.kobj, &ina209_group);
|
||||
ina209_restore_conf(client, data);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id ina209_id[] = {
|
||||
{ "ina209", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, ina209_id);
|
||||
|
||||
/* This is the driver that will be inserted */
|
||||
static struct i2c_driver ina209_driver = {
|
||||
.class = I2C_CLASS_HWMON,
|
||||
.driver = {
|
||||
.name = "ina209",
|
||||
},
|
||||
.probe = ina209_probe,
|
||||
.remove = ina209_remove,
|
||||
.id_table = ina209_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(ina209_driver);
|
||||
|
||||
MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>, Paul Hays <Paul.Hays@cattail.ca>, Guenter Roeck <linux@roeck-us.net>");
|
||||
MODULE_DESCRIPTION("INA209 driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user