On Tue, Jan 22, 2013 at 08:28:41PM -0800, Guenter Roeck wrote:
> Add support for the TI / Burr-Brown INA209 voltage / current / power
> monitor.
>
> Cc: Paul Hays <haysp@xxxxxxxxx>
> Cc: Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>
> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
> v2:
> - Updated Paul Hays' e-mail address and added as driver author
> - ina290_init_client -> ina209_init_client
> - Added devicetree support
> - Simplified chip initialization code
>
Hi Guenter,
I tested this on a PowerPC using the new devicetree support. It sets the
calibration registers correctly based on the devicetree values.
Tested-by: Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>
Thanks for the work on this!
Ira
> Documentation/devicetree/bindings/i2c/ina209.txt | 18 +
> Documentation/hwmon/ina209 | 93 ++++
> drivers/hwmon/Kconfig | 10 +
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/ina209.c | 636 ++++++++++++++++++++++
> 5 files changed, 758 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/i2c/ina209.txt
> create mode 100644 Documentation/hwmon/ina209
> create mode 100644 drivers/hwmon/ina209.c
>
> diff --git a/Documentation/devicetree/bindings/i2c/ina209.txt b/Documentation/devicetree/bindings/i2c/ina209.txt
> new file mode 100644
> index 0000000..9dd2bee
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/ina209.txt
> @@ -0,0 +1,18 @@
> +ina209 properties
> +
> +Required properties:
> +- compatible: Must be "ti,ina209"
> +- reg: I2C address
> +
> +Optional properties:
> +
> +- shunt-resistor
> + Shunt resistor value in micro-Ohm
> +
> +Example:
> +
> +temp-sensor@4c {
> + compatible = "ti,ina209";
> + reg = <0x4c>;
> + shunt-resistor = <5000>;
> +};
> diff --git a/Documentation/hwmon/ina209 b/Documentation/hwmon/ina209
> new file mode 100644
> index 0000000..672501d
> --- /dev/null
> +++ b/Documentation/hwmon/ina209
> @@ -0,0 +1,93 @@
> +Kernel driver ina209
> +=====================
> +
> +Supported chips:
> + * Burr-Brown / Texas Instruments INA209
> + Prefix: 'ina209'
> + Addresses scanned: -
> + Datasheet:
> + http://www.ti.com/lit/gpn/ina209
> +
> +Author: Paul Hays <Paul.Hays@xxxxxxxxxx>
> +Author: Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>
> +Author: Guenter Roeck <linux@xxxxxxxxxxxx>
> +
> +
> +Description
> +-----------
> +
> +The TI / Burr-Brown INA209 monitors voltage, current, and power on the high side
> +of a D.C. power supply. It can perform measurements and calculations in the
> +background to supply readings at any time. It includes a programmable
> +calibration multiplier to scale the displayed current and power values.
> +
> +
> +Sysfs entries
> +-------------
> +
> +The INA209 chip is highly configurable both via hardwiring and via
> +the I2C bus. See the datasheet for details.
> +
> +This tries to expose most monitoring features of the hardware via
> +sysfs. It does not support every feature of this chip.
> +
> +
> +in0_input shunt voltage (mV)
> +in0_input_highest shunt voltage historical maximum reading (mV)
> +in0_input_lowest shunt voltage historical minimum reading (mV)
> +in0_reset_history reset shunt voltage history
> +in0_max shunt voltage max alarm limit (mV)
> +in0_min shunt voltage min alarm limit (mV)
> +in0_crit_max shunt voltage crit max alarm limit (mV)
> +in0_crit_min shunt voltage crit min alarm limit (mV)
> +in0_max_alarm shunt voltage max alarm limit exceeded
> +in0_min_alarm shunt voltage min alarm limit exceeded
> +in0_crit_max_alarm shunt voltage crit max alarm limit exceeded
> +in0_crit_min_alarm shunt voltage crit min alarm limit exceeded
> +
> +in1_input bus voltage (mV)
> +in1_input_highest bus voltage historical maximum reading (mV)
> +in1_input_lowest bus voltage historical minimum reading (mV)
> +in1_reset_history reset bus voltage history
> +in1_max bus voltage max alarm limit (mV)
> +in1_min bus voltage min alarm limit (mV)
> +in1_crit_max bus voltage crit max alarm limit (mV)
> +in1_crit_min bus voltage crit min alarm limit (mV)
> +in1_max_alarm bus voltage max alarm limit exceeded
> +in1_min_alarm bus voltage min alarm limit exceeded
> +in1_crit_max_alarm bus voltage crit max alarm limit exceeded
> +in1_crit_min_alarm bus voltage crit min alarm limit exceeded
> +
> +power1_input power measurement (uW)
> +power1_input_highest power historical maximum reading (uW)
> +power1_reset_history reset power history
> +power1_max power max alarm limit (uW)
> +power1_crit power crit alarm limit (uW)
> +power1_max_alarm power max alarm limit exceeded
> +power1_crit_alarm power crit alarm limit exceeded
> +
> +curr1_input current measurement (mA)
> +
> +update_interval data conversion time; affects number of samples used
> + to average results for shunt and bus voltages.
> +
> +General Remarks
> +---------------
> +
> +The power and current registers in this chip require that the calibration
> +register is programmed correctly before they are used. Normally this is expected
> +to be done in the BIOS. In the absence of BIOS programming, the shunt resistor
> +voltage can be provided using platform data. The driver uses platform data from
> +the ina2xx driver for this purpose. If calibration register data is not provided
> +via platform data, the driver checks if the calibration register has been
> +programmed (ie has a value not equal to zero). If so, this value is retained.
> +Otherwise, a default value reflecting a shunt resistor value of 10 mOhm is
> +programmed into the calibration register.
> +
> +
> +Output Pins
> +-----------
> +
> +Output pin programming is a board feature which depends on the BIOS. It is
> +outside the scope of a hardware monitoring driver to enable or disable output
> +pins.
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 3588b2a..5e77cef 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1157,6 +1157,16 @@ config SENSORS_AMC6821
> This driver can also be build as a module. If so, the module
> will be called amc6821.
>
> +config SENSORS_INA209
> + tristate "TI / Burr Brown INA209"
> + depends on I2C
> + help
> + If you say yes here you get support for the TI / Burr Brown INA209
> + voltage / current / power monitor I2C interface.
> +
> + This driver can also be built as a module. If so, the module will
> + be called ina209.
> +
> config SENSORS_INA2XX
> tristate "Texas Instruments INA219 and compatibles"
> depends on I2C
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index a37a82c..8d6d97e 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -65,6 +65,7 @@ obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
> obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
> obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
> obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
> +obj-$(CONFIG_SENSORS_INA209) += ina209.o
> obj-$(CONFIG_SENSORS_INA2XX) += ina2xx.o
> obj-$(CONFIG_SENSORS_IT87) += it87.o
> obj-$(CONFIG_SENSORS_JC42) += jc42.o
> diff --git a/drivers/hwmon/ina209.c b/drivers/hwmon/ina209.c
> new file mode 100644
> index 0000000..c6fdd5b
> --- /dev/null
> +++ b/drivers/hwmon/ina209.c
> @@ -0,0 +1,636 @@
> +/*
> + * Driver for the Texas Instruments / Burr Brown INA209
> + * Bidirectional Current/Power Monitor
> + *
> + * Copyright (C) 2012 Guenter Roeck <linux@xxxxxxxxxxxx>
> + *
> + * Derived from Ira W. Snyder's original driver submission
> + * Copyright (C) 2008 Paul Hays <Paul.Hays@xxxxxxxxxx>
> + * Copyright (C) 2008-2009 Ira W. Snyder <iws@xxxxxxxxxxxxxxxx>
> + *
> + * Aligned with ina2xx driver
> + * Copyright (C) 2012 Lothar Felten <l-felten@xxxxxx>
> + * Thanks to Jan Volkering
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; version 2 of the License.
> + *
> + * Datasheet:
> + * http://www.ti.com/lit/gpn/ina209
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/bug.h>
> +#include <linux/i2c.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +
> +#include <linux/platform_data/ina2xx.h>
> +
> +/* register definitions */
> +#define INA209_CONFIGURATION 0x00
> +#define INA209_STATUS 0x01
> +#define INA209_STATUS_MASK 0x02
> +#define INA209_SHUNT_VOLTAGE 0x03
> +#define INA209_BUS_VOLTAGE 0x04
> +#define INA209_POWER 0x05
> +#define INA209_CURRENT 0x06
> +#define INA209_SHUNT_VOLTAGE_POS_PEAK 0x07
> +#define INA209_SHUNT_VOLTAGE_NEG_PEAK 0x08
> +#define INA209_BUS_VOLTAGE_MAX_PEAK 0x09
> +#define INA209_BUS_VOLTAGE_MIN_PEAK 0x0a
> +#define INA209_POWER_PEAK 0x0b
> +#define INA209_SHUNT_VOLTAGE_POS_WARN 0x0c
> +#define INA209_SHUNT_VOLTAGE_NEG_WARN 0x0d
> +#define INA209_POWER_WARN 0x0e
> +#define INA209_BUS_VOLTAGE_OVER_WARN 0x0f
> +#define INA209_BUS_VOLTAGE_UNDER_WARN 0x10
> +#define INA209_POWER_OVER_LIMIT 0x11
> +#define INA209_BUS_VOLTAGE_OVER_LIMIT 0x12
> +#define INA209_BUS_VOLTAGE_UNDER_LIMIT 0x13
> +#define INA209_CRITICAL_DAC_POS 0x14
> +#define INA209_CRITICAL_DAC_NEG 0x15
> +#define INA209_CALIBRATION 0x16
> +
> +#define INA209_REGISTERS 0x17
> +
> +#define INA209_CONFIG_DEFAULT 0x3c47 /* PGA=8, full range */
> +#define INA209_SHUNT_DEFAULT 10000 /* uOhm */
> +
> +struct ina209_data {
> + struct device *hwmon_dev;
> +
> + struct mutex update_lock;
> + bool valid;
> + unsigned long last_updated; /* in jiffies */
> +
> + u16 regs[INA209_REGISTERS]; /* All chip registers */
> +
> + u16 config_orig; /* Original configuration */
> + u16 calibration_orig; /* Original calibration */
> + u16 update_interval;
> +};
> +
> +static struct ina209_data *ina209_update_device(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct ina209_data *data = i2c_get_clientdata(client);
> + struct ina209_data *ret = data;
> + s32 val;
> + int i;
> +
> + mutex_lock(&data->update_lock);
> +
> + if (!data->valid ||
> + time_after(jiffies, data->last_updated + data->update_interval)) {
> + for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
> + val = i2c_smbus_read_word_swapped(client, i);
> + if (val < 0) {
> + ret = ERR_PTR(val);
> + goto abort;
> + }
> + data->regs[i] = val;
> + }
> + data->last_updated = jiffies;
> + data->valid = true;
> + }
> +abort:
> + mutex_unlock(&data->update_lock);
> + return ret;
> +}
> +
> +/*
> + * Read a value from a device register and convert it to the
> + * appropriate sysfs units
> + */
> +static long ina209_from_reg(const u8 reg, const u16 val)
> +{
> + switch (reg) {
> + case INA209_SHUNT_VOLTAGE:
> + case INA209_SHUNT_VOLTAGE_POS_PEAK:
> + case INA209_SHUNT_VOLTAGE_NEG_PEAK:
> + case INA209_SHUNT_VOLTAGE_POS_WARN:
> + case INA209_SHUNT_VOLTAGE_NEG_WARN:
> + /* LSB=10 uV. Convert to mV. */
> + return DIV_ROUND_CLOSEST(val, 100);
> +
> + case INA209_BUS_VOLTAGE:
> + case INA209_BUS_VOLTAGE_MAX_PEAK:
> + case INA209_BUS_VOLTAGE_MIN_PEAK:
> + case INA209_BUS_VOLTAGE_OVER_WARN:
> + case INA209_BUS_VOLTAGE_UNDER_WARN:
> + case INA209_BUS_VOLTAGE_OVER_LIMIT:
> + case INA209_BUS_VOLTAGE_UNDER_LIMIT:
> + /* LSB=4 mV, last 3 bits unused */
> + return (val >> 3) * 4;
> +
> + case INA209_CRITICAL_DAC_POS:
> + /* LSB=1 mV, in the upper 8 bits */
> + return val >> 8;
> +
> + case INA209_CRITICAL_DAC_NEG:
> + /* LSB=1 mV, in the upper 8 bits */
> + return -1 * (val >> 8);
> +
> + case INA209_POWER:
> + case INA209_POWER_PEAK:
> + case INA209_POWER_WARN:
> + case INA209_POWER_OVER_LIMIT:
> + /* LSB=20 mW. Convert to uW */
> + return val * 20 * 1000L;
> +
> + case INA209_CURRENT:
> + /* LSB=1 mA (selected). Is in mA */
> + return val;
> + }
> +
> + /* programmer goofed */
> + WARN_ON_ONCE(1);
> + return 0;
> +}
> +
> +/*
> + * Take a value and convert it to register format, clamping the value
> + * to the appropriate range.
> + */
> +static int ina209_to_reg(u8 reg, u16 old, long val)
> +{
> + switch (reg) {
> + case INA209_SHUNT_VOLTAGE_POS_WARN:
> + case INA209_SHUNT_VOLTAGE_NEG_WARN:
> + /* Limit to +- 320 mV, 10 uV LSB */
> + return clamp_val(val, -320, 320) * 100;
> +
> + case INA209_BUS_VOLTAGE_OVER_WARN:
> + case INA209_BUS_VOLTAGE_UNDER_WARN:
> + case INA209_BUS_VOLTAGE_OVER_LIMIT:
> + case INA209_BUS_VOLTAGE_UNDER_LIMIT:
> + /*
> + * Limit to 0-32000 mV, 4 mV LSB
> + *
> + * The last three bits aren't part of the value, but we'll
> + * preserve them in their original state.
> + */
> + return (DIV_ROUND_CLOSEST(clamp_val(val, 0, 32000), 4) << 3)
> + | (old & 0x7);
> +
> + case INA209_CRITICAL_DAC_NEG:
> + /*
> + * Limit to -255-0 mV, 1 mV LSB
> + * Convert the value to a positive value for the register
> + *
> + * The value lives in the top 8 bits only, be careful
> + * and keep original value of other bits.
> + */
> + return (clamp_val(-val, 0, 255) << 8) | (old & 0xff);
> +
> + case INA209_CRITICAL_DAC_POS:
> + /*
> + * Limit to 0-255 mV, 1 mV LSB
> + *
> + * The value lives in the top 8 bits only, be careful
> + * and keep original value of other bits.
> + */
> + return (clamp_val(val, 0, 255) << 8) | (old & 0xff);
> +
> + case INA209_POWER_WARN:
> + case INA209_POWER_OVER_LIMIT:
> + /* 20 mW LSB */
> + return DIV_ROUND_CLOSEST(val, 20 * 1000);
> + }
> +
> + /* Other registers are read-only, return access error */
> + return -EACCES;
> +}
> +
> +static int ina209_interval_from_reg(u16 reg)
> +{
> + return 68 >> (15 - ((reg >> 3) & 0x0f));
> +}
> +
> +static u16 ina209_reg_from_interval(u16 config, long interval)
> +{
> + int i, adc;
> +
> + if (interval <= 0) {
> + adc = 8;
> + } else {
> + adc = 15;
> + for (i = 34 + 34 / 2; i; i >>= 1) {
> + if (i < interval)
> + break;
> + adc--;
> + }
> + }
> + return (config & 0xf807) | (adc << 3) | (adc << 7);
> +}
> +
> +static ssize_t ina209_set_interval(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);
> + long val;
> + u16 regval;
> + 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);
> + regval = ina209_reg_from_interval(data->regs[INA209_CONFIGURATION],
> + val);
> + i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION, regval);
> + data->regs[INA209_CONFIGURATION] = regval;
> + data->update_interval = ina209_interval_from_reg(regval);
> + mutex_unlock(&data->update_lock);
> + return count;
> +}
> +
> +static ssize_t ina209_show_interval(struct device *dev,
> + struct device_attribute *da, char *buf)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct ina209_data *data = i2c_get_clientdata(client);
> +
> + return snprintf(buf, PAGE_SIZE, "%d\n", data->update_interval);
> +}
> +
> +/*
> + * History is reset by writing 1 into bit 0 of the respective peak register.
> + * Since more than one peak register may be affected by the scope of a
> + * reset_history attribute write, use a bit mask in attr->index to identify
> + * which registers are affected.
> + */
> +static u16 ina209_reset_history_regs[] = {
> + INA209_SHUNT_VOLTAGE_POS_PEAK,
> + INA209_SHUNT_VOLTAGE_NEG_PEAK,
> + INA209_BUS_VOLTAGE_MAX_PEAK,
> + INA209_BUS_VOLTAGE_MIN_PEAK,
> + INA209_POWER_PEAK
> +};
> +
> +static ssize_t ina209_reset_history(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 = i2c_get_clientdata(client);
> + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> + u32 mask = attr->index;
> + long val;
> + int i, ret;
> +
> + ret = kstrtol(buf, 10, &val);
> + if (ret < 0)
> + return ret;
> +
> + mutex_lock(&data->update_lock);
> + for (i = 0; i < ARRAY_SIZE(ina209_reset_history_regs); i++) {
> + 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@xxxxxxxxxxxxxxxx>, Paul Hays <Paul.Hays@xxxxxxxxxx>, Guenter Roeck <linux@xxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("INA209 driver");
> +MODULE_LICENSE("GPL");
> --
> 1.7.9.7
>
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