Re: [PATCH v2] hwmon: Driver for Texas Instruments INA209

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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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