Release 4.7 drivers/hwmon/ina2xx.c

/*
 * Driver for Texas Instruments INA219, INA226 power monitor chips
 *
 * INA219:
 * Zero Drift Bi-Directional Current/Power Monitor with I2C Interface
 * Datasheet: http://www.ti.com/product/ina219
 *
 * INA220:
 * Bi-Directional Current/Power Monitor with I2C Interface
 * Datasheet: http://www.ti.com/product/ina220
 *
 * INA226:
 * Bi-Directional Current/Power Monitor with I2C Interface
 * Datasheet: http://www.ti.com/product/ina226
 *
 * INA230:
 * Bi-directional Current/Power Monitor with I2C Interface
 * Datasheet: http://www.ti.com/product/ina230
 *
 * Copyright (C) 2012 Lothar Felten <l-felten@ti.com>
 * 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.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/jiffies.h>
#include <linux/of.h>
#include <linux/delay.h>
#include <linux/util_macros.h>
#include <linux/regmap.h>

#include <linux/platform_data/ina2xx.h>

/* common register definitions */

#define INA2XX_CONFIG			0x00

#define INA2XX_SHUNT_VOLTAGE		0x01 
/* readonly */

#define INA2XX_BUS_VOLTAGE		0x02 
/* readonly */

#define INA2XX_POWER			0x03 
/* readonly */

#define INA2XX_CURRENT			0x04 
/* readonly */

#define INA2XX_CALIBRATION		0x05

/* INA226 register definitions */

#define INA226_MASK_ENABLE		0x06

#define INA226_ALERT_LIMIT		0x07

#define INA226_DIE_ID			0xFF

/* register count */

#define INA219_REGISTERS		6

#define INA226_REGISTERS		8


#define INA2XX_MAX_REGISTERS		8

/* settings - depend on use case */

#define INA219_CONFIG_DEFAULT		0x399F	
/* PGA=8 */

#define INA226_CONFIG_DEFAULT		0x4527	
/* averages=16 */

/* worst case is 68.10 ms (~14.6Hz, ina219) */

#define INA2XX_CONVERSION_RATE		15

#define INA2XX_MAX_DELAY		69 
/* worst case delay in ms */


#define INA2XX_RSHUNT_DEFAULT		10000

/* bit mask for reading the averaging setting in the configuration register */

#define INA226_AVG_RD_MASK		0x0E00


#define INA226_READ_AVG(reg)		(((reg) & INA226_AVG_RD_MASK) >> 9)

#define INA226_SHIFT_AVG(val)		((val) << 9)

/* common attrs, ina226 attrs and NULL */

#define INA2XX_MAX_ATTRIBUTE_GROUPS	3

/*
 * Both bus voltage and shunt voltage conversion times for ina226 are set
 * to 0b0100 on POR, which translates to 2200 microseconds in total.
 */

#define INA226_TOTAL_CONV_TIME_DEFAULT	2200


static struct regmap_config ina2xx_regmap_config = {
	.reg_bits = 8,
	.val_bits = 16,
};




enum ina2xx_ids { ina219, ina226 };


struct ina2xx_config {
	
u16 config_default;
	
int calibration_factor;
	
int registers;
	
int shunt_div;
	
int bus_voltage_shift;
	
int bus_voltage_lsb;	/* uV */
	
int power_lsb;		/* uW */
};


struct ina2xx_data {
	
const struct ina2xx_config *config;

	
long rshunt;
	
struct mutex config_lock;
	
struct regmap *regmap;

	
const struct attribute_group *groups[INA2XX_MAX_ATTRIBUTE_GROUPS];
};


static const struct ina2xx_config ina2xx_config[] = {
	[ina219] = {
		.config_default = INA219_CONFIG_DEFAULT,
		.calibration_factor = 40960000,
		.registers = INA219_REGISTERS,
		.shunt_div = 100,
		.bus_voltage_shift = 3,
		.bus_voltage_lsb = 4000,
		.power_lsb = 20000,
        },
	[ina226] = {
		.config_default = INA226_CONFIG_DEFAULT,
		.calibration_factor = 5120000,
		.registers = INA226_REGISTERS,
		.shunt_div = 400,
		.bus_voltage_shift = 0,
		.bus_voltage_lsb = 1250,
		.power_lsb = 25000,
        },
};

/*
 * Available averaging rates for ina226. The indices correspond with
 * the bit values expected by the chip (according to the ina226 datasheet,
 * table 3 AVG bit settings, found at
 * http://www.ti.com/lit/ds/symlink/ina226.pdf.
 */

static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 };



static int ina226_reg_to_interval(u16 config)
{
	int avg = ina226_avg_tab[INA226_READ_AVG(config)];

	/*
         * Multiply the total conversion time by the number of averages.
         * Return the result in milliseconds.
         */
	return DIV_ROUND_CLOSEST(avg * INA226_TOTAL_CONV_TIME_DEFAULT, 1000);
}

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/*
 * Return the new, shifted AVG field value of CONFIG register,
 * to use with regmap_update_bits
 */


static u16 ina226_interval_to_reg(int interval)
{
	int avg, avg_bits;

	avg = DIV_ROUND_CLOSEST(interval * 1000,
				INA226_TOTAL_CONV_TIME_DEFAULT);
	avg_bits = find_closest(avg, ina226_avg_tab,
				ARRAY_SIZE(ina226_avg_tab));

	return INA226_SHIFT_AVG(avg_bits);
}

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static int ina2xx_calibrate(struct ina2xx_data *data)
{
	u16 val = DIV_ROUND_CLOSEST(data->config->calibration_factor,
				    data->rshunt);

	return regmap_write(data->regmap, INA2XX_CALIBRATION, val);
}

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/*
 * Initialize the configuration and calibration registers.
 */


static int ina2xx_init(struct ina2xx_data *data)
{
	int ret = regmap_write(data->regmap, INA2XX_CONFIG,
			       data->config->config_default);
	if (ret < 0)
		return ret;

	/*
         * Set current LSB to 1mA, shunt is in uOhms
         * (equation 13 in datasheet).
         */
	return ina2xx_calibrate(data);
}

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static int ina2xx_read_reg(struct device *dev, int reg, unsigned int *regval)
{
	struct ina2xx_data *data = dev_get_drvdata(dev);
	int ret, retry;

	dev_dbg(dev, "Starting register %d read\n", reg);

	for (retry = 5; retry; retry--) {

		ret = regmap_read(data->regmap, reg, regval);
		if (ret < 0)
			return ret;

		dev_dbg(dev, "read %d, val = 0x%04x\n", reg, *regval);

		/*
                 * If the current value in the calibration register is 0, the
                 * power and current registers will also remain at 0. In case
                 * the chip has been reset let's check the calibration
                 * register and reinitialize if needed.
                 * We do that extra read of the calibration register if there
                 * is some hint of a chip reset.
                 */
		if (*regval == 0) {
			unsigned int cal;

			ret = regmap_read(data->regmap, INA2XX_CALIBRATION,
					  &cal);
			if (ret < 0)
				return ret;

			if (cal == 0) {
				dev_warn(dev, "chip not calibrated, reinitializing\n");

				ret = ina2xx_init(data);
				if (ret < 0)
					return ret;
				/*
                                 * Let's make sure the power and current
                                 * registers have been updated before trying
                                 * again.
                                 */
				msleep(INA2XX_MAX_DELAY);
				continue;
			}
		}
		return 0;
	}

	/*
         * If we're here then although all write operations succeeded, the
         * chip still returns 0 in the calibration register. Nothing more we
         * can do here.
         */
	dev_err(dev, "unable to reinitialize the chip\n");
	return -ENODEV;
}

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static int ina2xx_get_value(struct ina2xx_data *data, u8 reg,
			    unsigned int regval)
{
	int val;

	switch (reg) {
	case INA2XX_SHUNT_VOLTAGE:
		/* signed register */
		val = DIV_ROUND_CLOSEST((s16)regval, data->config->shunt_div);
		break;
	case INA2XX_BUS_VOLTAGE:
		val = (regval >> data->config->bus_voltage_shift)
		  * data->config->bus_voltage_lsb;
		val = DIV_ROUND_CLOSEST(val, 1000);
		break;
	case INA2XX_POWER:
		val = regval * data->config->power_lsb;
		break;
	case INA2XX_CURRENT:
		/* signed register, LSB=1mA (selected), in mA */
		val = (s16)regval;
		break;
	case INA2XX_CALIBRATION:
		val = DIV_ROUND_CLOSEST(data->config->calibration_factor,
					regval);
		break;
	default:
		/* programmer goofed */
		WARN_ON_ONCE(1);
		val = 0;
		break;
	}

	return val;
}

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static ssize_t ina2xx_show_value(struct device *dev,
				 struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct ina2xx_data *data = dev_get_drvdata(dev);
	unsigned int regval;

	int err = ina2xx_read_reg(dev, attr->index, &regval);

	if (err < 0)
		return err;

	return snprintf(buf, PAGE_SIZE, "%d\n",
			ina2xx_get_value(data, attr->index, regval));
}

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static ssize_t ina2xx_set_shunt(struct device *dev,
				struct device_attribute *da,
				const char *buf, size_t count)
{
	unsigned long val;
	int status;
	struct ina2xx_data *data = dev_get_drvdata(dev);

	status = kstrtoul(buf, 10, &val);
	if (status < 0)
		return status;

	if (val == 0 ||
	    /* Values greater than the calibration factor make no sense. */
	    val > data->config->calibration_factor)
		return -EINVAL;

	mutex_lock(&data->config_lock);
	data->rshunt = val;
	status = ina2xx_calibrate(data);
	mutex_unlock(&data->config_lock);
	if (status < 0)
		return status;

	return count;
}

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static ssize_t ina226_set_interval(struct device *dev,
				   struct device_attribute *da,
				   const char *buf, size_t count)
{
	struct ina2xx_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int status;

	status = kstrtoul(buf, 10, &val);
	if (status < 0)
		return status;

	if (val > INT_MAX || val == 0)
		return -EINVAL;

	status = regmap_update_bits(data->regmap, INA2XX_CONFIG,
				    INA226_AVG_RD_MASK,
				    ina226_interval_to_reg(val));
	if (status < 0)
		return status;

	return count;
}

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static ssize_t ina226_show_interval(struct device *dev,
				    struct device_attribute *da, char *buf)
{
	struct ina2xx_data *data = dev_get_drvdata(dev);
	int status;
	unsigned int regval;

	status = regmap_read(data->regmap, INA2XX_CONFIG, &regval);
	if (status)
		return status;

	return snprintf(buf, PAGE_SIZE, "%d\n", ina226_reg_to_interval(regval));
}

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/* shunt voltage */
static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina2xx_show_value, NULL,
			  INA2XX_SHUNT_VOLTAGE);

/* bus voltage */
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina2xx_show_value, NULL,
			  INA2XX_BUS_VOLTAGE);

/* calculated current */
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina2xx_show_value, NULL,
			  INA2XX_CURRENT);

/* calculated power */
static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina2xx_show_value, NULL,
			  INA2XX_POWER);

/* shunt resistance */
static SENSOR_DEVICE_ATTR(shunt_resistor, S_IRUGO | S_IWUSR,
			  ina2xx_show_value, ina2xx_set_shunt,
			  INA2XX_CALIBRATION);

/* update interval (ina226 only) */
static SENSOR_DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR,
			  ina226_show_interval, ina226_set_interval, 0);

/* pointers to created device attributes */

static struct attribute *ina2xx_attrs[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_curr1_input.dev_attr.attr,
	&sensor_dev_attr_power1_input.dev_attr.attr,
	&sensor_dev_attr_shunt_resistor.dev_attr.attr,
	NULL,
};


static const struct attribute_group ina2xx_group = {
	.attrs = ina2xx_attrs,
};


static struct attribute *ina226_attrs[] = {
	&sensor_dev_attr_update_interval.dev_attr.attr,
	NULL,
};


static const struct attribute_group ina226_group = {
	.attrs = ina226_attrs,
};



static int ina2xx_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct ina2xx_data *data;
	struct device *hwmon_dev;
	u32 val;
	int ret, group = 0;

	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	/* set the device type */
	data->config = &ina2xx_config[id->driver_data];

	if (of_property_read_u32(dev->of_node, "shunt-resistor", &val) < 0) {
		struct ina2xx_platform_data *pdata = dev_get_platdata(dev);

		if (pdata)
			val = pdata->shunt_uohms;
		else
			val = INA2XX_RSHUNT_DEFAULT;
	}

	if (val <= 0 || val > data->config->calibration_factor)
		return -ENODEV;

	data->rshunt = val;

	ina2xx_regmap_config.max_register = data->config->registers;

	data->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config);
	if (IS_ERR(data->regmap)) {
		dev_err(dev, "failed to allocate register map\n");
		return PTR_ERR(data->regmap);
	}

	ret = ina2xx_init(data);
	if (ret < 0) {
		dev_err(dev, "error configuring the device: %d\n", ret);
		return -ENODEV;
	}

	mutex_init(&data->config_lock);

	data->groups[group++] = &ina2xx_group;
	if (id->driver_data == ina226)
		data->groups[group++] = &ina226_group;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
							   data, data->groups);
	if (IS_ERR(hwmon_dev))
		return PTR_ERR(hwmon_dev);

	dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",
		 id->name, data->rshunt);

	return 0;
}

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static const struct i2c_device_id ina2xx_id[] = {
	{ "ina219", ina219 },
	{ "ina220", ina219 },
	{ "ina226", ina226 },
	{ "ina230", ina226 },
	{ "ina231", ina226 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ina2xx_id);


static struct i2c_driver ina2xx_driver = {
	.driver = {
		.name	= "ina2xx",
        },
	.probe		= ina2xx_probe,
	.id_table	= ina2xx_id,
};


module_i2c_driver(ina2xx_driver);

MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");
MODULE_DESCRIPTION("ina2xx driver");
MODULE_LICENSE("GPL");
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Directory: drivers/hwmon

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