[deliverable/linux.git] / 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/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

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 {
	struct i2c_client *client;
	const struct ina2xx_config *config;

	long rshunt;

	struct mutex update_lock;
	bool valid;
	unsigned long last_updated;

	int kind;
	u16 regs[INA2XX_MAX_REGISTERS];
};

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,
	},
};

/*
 * Initialize the configuration and calibration registers.
 */
static int ina2xx_init(struct ina2xx_data *data)
{
	struct i2c_client *client = data->client;
	int ret;

	/* device configuration */
	ret = i2c_smbus_write_word_swapped(client, 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 i2c_smbus_write_word_swapped(client, INA2XX_CALIBRATION,
			data->config->calibration_factor / data->rshunt);
}

static int ina2xx_do_update(struct device *dev)
{
	struct ina2xx_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int i, rv, retry;

	dev_dbg(&client->dev, "Starting ina2xx update\n");

	for (retry = 5; retry; retry--) {
		/* Read all registers */
		for (i = 0; i < data->config->registers; i++) {
			rv = i2c_smbus_read_word_swapped(client, i);
			if (rv < 0)
				return rv;
			data->regs[i] = rv;
		}

		/*
		 * 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.
		 */
		if (data->regs[INA2XX_CALIBRATION] == 0) {
			dev_warn(dev, "chip not calibrated, reinitializing\n");

			rv = ina2xx_init(data);
			if (rv < 0)
				return rv;

			/*
			 * Let's make sure the power and current registers
			 * have been updated before trying again.
			 */
			msleep(INA2XX_MAX_DELAY);
			continue;
		}

		data->last_updated = jiffies;
		data->valid = 1;

		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;
}

static struct ina2xx_data *ina2xx_update_device(struct device *dev)
{
	struct ina2xx_data *data = dev_get_drvdata(dev);
	struct ina2xx_data *ret = data;
	int rv;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated +
		       HZ / INA2XX_CONVERSION_RATE) || !data->valid) {
		rv = ina2xx_do_update(dev);
		if (rv < 0)
			ret = ERR_PTR(rv);
	}

	mutex_unlock(&data->update_lock);
	return ret;
}

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

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

	return val;
}

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 = ina2xx_update_device(dev);

	if (IS_ERR(data))
		return PTR_ERR(data);

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

/* 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);

/* 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,
	NULL,
};
ATTRIBUTE_GROUPS(ina2xx);

static int ina2xx_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = client->adapter;
	struct ina2xx_platform_data *pdata;
	struct device *dev = &client->dev;
	struct ina2xx_data *data;
	struct device *hwmon_dev;
	u32 val;
	int ret;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
		return -ENODEV;

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

	if (dev_get_platdata(dev)) {
		pdata = dev_get_platdata(dev);
		data->rshunt = pdata->shunt_uohms;
	} else if (!of_property_read_u32(dev->of_node,
					 "shunt-resistor", &val)) {
		data->rshunt = val;
	} else {
		data->rshunt = INA2XX_RSHUNT_DEFAULT;
	}

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

	if (data->rshunt <= 0)
		return -ENODEV;

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

	mutex_init(&data->update_lock);

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
							   data, ina2xx_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;
}

static const struct i2c_device_id ina2xx_id[] = {
	{ "ina219", ina219 },
	{ "ina220", ina219 },
	{ "ina226", ina226 },
	{ "ina230", 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");
Commit	Line	Data
f7c2fe38 FL	1	/*
	2	* Driver for Texas Instruments INA219, INA226 power monitor chips
	3	*
	4	* INA219:
	5	* Zero Drift Bi-Directional Current/Power Monitor with I2C Interface
	6	* Datasheet: http://www.ti.com/product/ina219
	7	*
dc92cd0c GR	8	* INA220:
	9	* Bi-Directional Current/Power Monitor with I2C Interface
	10	* Datasheet: http://www.ti.com/product/ina220
	11	*
f7c2fe38 FL	12	* INA226:
	13	* Bi-Directional Current/Power Monitor with I2C Interface
	14	* Datasheet: http://www.ti.com/product/ina226
	15	*
dc92cd0c GR	16	* INA230:
	17	* Bi-directional Current/Power Monitor with I2C Interface
	18	* Datasheet: http://www.ti.com/product/ina230
	19	*
f7c2fe38 FL	20	* Copyright (C) 2012 Lothar Felten <l-felten@ti.com>
	21	* Thanks to Jan Volkering
	22	*
	23	* This program is free software; you can redistribute it and/or modify
	24	* it under the terms of the GNU General Public License as published by
	25	* the Free Software Foundation; version 2 of the License.
	26	*/
	27
	28	#include <linux/kernel.h>
	29	#include <linux/module.h>
	30	#include <linux/init.h>
	31	#include <linux/err.h>
	32	#include <linux/slab.h>
	33	#include <linux/i2c.h>
	34	#include <linux/hwmon.h>
	35	#include <linux/hwmon-sysfs.h>
dcd8f392	36	#include <linux/jiffies.h>
31e7ad74	37	#include <linux/of.h>
509416a8	38	#include <linux/delay.h>
f7c2fe38 FL	39
	40	#include <linux/platform_data/ina2xx.h>
	41
	42	/* common register definitions */
	43	#define INA2XX_CONFIG 0x00
	44	#define INA2XX_SHUNT_VOLTAGE 0x01 /* readonly */
	45	#define INA2XX_BUS_VOLTAGE 0x02 /* readonly */
	46	#define INA2XX_POWER 0x03 /* readonly */
	47	#define INA2XX_CURRENT 0x04 /* readonly */
	48	#define INA2XX_CALIBRATION 0x05
	49
	50	/* INA226 register definitions */
	51	#define INA226_MASK_ENABLE 0x06
	52	#define INA226_ALERT_LIMIT 0x07
	53	#define INA226_DIE_ID 0xFF
	54
f7c2fe38 FL	55	/* register count */
	56	#define INA219_REGISTERS 6
	57	#define INA226_REGISTERS 8
	58
	59	#define INA2XX_MAX_REGISTERS 8
	60
	61	/* settings - depend on use case */
	62	#define INA219_CONFIG_DEFAULT 0x399F /* PGA=8 */
	63	#define INA226_CONFIG_DEFAULT 0x4527 /* averages=16 */
	64
	65	/* worst case is 68.10 ms (~14.6Hz, ina219) */
	66	#define INA2XX_CONVERSION_RATE 15
509416a8 BG	67	#define INA2XX_MAX_DELAY 69 /* worst case delay in ms */
	68
	69	#define INA2XX_RSHUNT_DEFAULT 10000
f7c2fe38 FL	70
	71	enum ina2xx_ids { ina219, ina226 };
	72
6106db25 GR	73	struct ina2xx_config {
	74	u16 config_default;
	75	int calibration_factor;
	76	int registers;
	77	int shunt_div;
	78	int bus_voltage_shift;
	79	int bus_voltage_lsb; /* uV */
	80	int power_lsb; /* uW */
	81	};
	82
f7c2fe38	83	struct ina2xx_data {
468bf0e3	84	struct i2c_client *client;
6106db25	85	const struct ina2xx_config *config;
f7c2fe38	86
509416a8 BG	87	long rshunt;
509416a8 BG	88
f7c2fe38 FL	89	struct mutex update_lock;
	90	bool valid;
	91	unsigned long last_updated;
	92
	93	int kind;
f7c2fe38 FL	94	u16 regs[INA2XX_MAX_REGISTERS];
	95	};
	96
6106db25 GR	97	static const struct ina2xx_config ina2xx_config[] = {
	98	[ina219] = {
	99	.config_default = INA219_CONFIG_DEFAULT,
	100	.calibration_factor = 40960000,
	101	.registers = INA219_REGISTERS,
	102	.shunt_div = 100,
	103	.bus_voltage_shift = 3,
	104	.bus_voltage_lsb = 4000,
	105	.power_lsb = 20000,
	106	},
	107	[ina226] = {
	108	.config_default = INA226_CONFIG_DEFAULT,
	109	.calibration_factor = 5120000,
	110	.registers = INA226_REGISTERS,
	111	.shunt_div = 400,
	112	.bus_voltage_shift = 0,
	113	.bus_voltage_lsb = 1250,
	114	.power_lsb = 25000,
	115	},
	116	};
	117
509416a8 BG	118	/*
	119	* Initialize the configuration and calibration registers.
	120	*/
	121	static int ina2xx_init(struct ina2xx_data *data)
f7c2fe38	122	{
468bf0e3	123	struct i2c_client *client = data->client;
509416a8	124	int ret;
f7c2fe38	125
509416a8 BG	126	/* device configuration */
	127	ret = i2c_smbus_write_word_swapped(client, INA2XX_CONFIG,
	128	data->config->config_default);
	129	if (ret < 0)
	130	return ret;
f7c2fe38	131
509416a8 BG	132	/*
	133	* Set current LSB to 1mA, shunt is in uOhms
	134	* (equation 13 in datasheet).
	135	*/
	136	return i2c_smbus_write_word_swapped(client, INA2XX_CALIBRATION,
	137	data->config->calibration_factor / data->rshunt);
	138	}
f7c2fe38	139
509416a8 BG	140	static int ina2xx_do_update(struct device *dev)
	141	{
	142	struct ina2xx_data *data = dev_get_drvdata(dev);
	143	struct i2c_client *client = data->client;
	144	int i, rv, retry;
f7c2fe38	145
509416a8	146	dev_dbg(&client->dev, "Starting ina2xx update\n");
f7c2fe38	147
509416a8	148	for (retry = 5; retry; retry--) {
f7c2fe38	149	/* Read all registers */
6106db25	150	for (i = 0; i < data->config->registers; i++) {
509416a8 BG	151	rv = i2c_smbus_read_word_swapped(client, i);
	152	if (rv < 0)
	153	return rv;
f7c2fe38 FL	154	data->regs[i] = rv;
f7c2fe38 FL	155	}
509416a8 BG	156
	157	/*
	158	* If the current value in the calibration register is 0, the
	159	* power and current registers will also remain at 0. In case
	160	* the chip has been reset let's check the calibration
	161	* register and reinitialize if needed.
	162	*/
	163	if (data->regs[INA2XX_CALIBRATION] == 0) {
	164	dev_warn(dev, "chip not calibrated, reinitializing\n");
	165
	166	rv = ina2xx_init(data);
	167	if (rv < 0)
	168	return rv;
	169
	170	/*
	171	* Let's make sure the power and current registers
	172	* have been updated before trying again.
	173	*/
	174	msleep(INA2XX_MAX_DELAY);
	175	continue;
	176	}
	177
f7c2fe38 FL	178	data->last_updated = jiffies;
f7c2fe38 FL	179	data->valid = 1;
509416a8 BG	180
509416a8 BG	181	return 0;
f7c2fe38	182	}
509416a8 BG	183
	184	/*
	185	* If we're here then although all write operations succeeded, the
	186	* chip still returns 0 in the calibration register. Nothing more we
	187	* can do here.
	188	*/
	189	dev_err(dev, "unable to reinitialize the chip\n");
	190	return -ENODEV;
	191	}
	192
	193	static struct ina2xx_data ina2xx_update_device(struct device dev)
	194	{
	195	struct ina2xx_data *data = dev_get_drvdata(dev);
	196	struct ina2xx_data *ret = data;
	197	int rv;
	198
	199	mutex_lock(&data->update_lock);
	200
	201	if (time_after(jiffies, data->last_updated +
	202	HZ / INA2XX_CONVERSION_RATE) \|\| !data->valid) {
	203	rv = ina2xx_do_update(dev);
	204	if (rv < 0)
	205	ret = ERR_PTR(rv);
	206	}
	207
f7c2fe38 FL	208	mutex_unlock(&data->update_lock);
	209	return ret;
	210	}
	211
6106db25	212	static int ina2xx_get_value(struct ina2xx_data *data, u8 reg)
f7c2fe38	213	{
6106db25	214	int val;
f7c2fe38 FL	215
	216	switch (reg) {
	217	case INA2XX_SHUNT_VOLTAGE:
c0214f98 FB	218	/* signed register */
c0214f98 FB	219	val = DIV_ROUND_CLOSEST((s16)data->regs[reg],
6106db25	220	data->config->shunt_div);
f7c2fe38 FL	221	break;
f7c2fe38 FL	222	case INA2XX_BUS_VOLTAGE:
6106db25 GR	223	val = (data->regs[reg] >> data->config->bus_voltage_shift)
	224	* data->config->bus_voltage_lsb;
	225	val = DIV_ROUND_CLOSEST(val, 1000);
f7c2fe38 FL	226	break;
f7c2fe38 FL	227	case INA2XX_POWER:
6106db25	228	val = data->regs[reg] * data->config->power_lsb;
f7c2fe38 FL	229	break;
f7c2fe38 FL	230	case INA2XX_CURRENT:
c0214f98 FB	231	/* signed register, LSB=1mA (selected), in mA */
c0214f98 FB	232	val = (s16)data->regs[reg];
f7c2fe38 FL	233	break;
	234	default:
	235	/* programmer goofed */
	236	WARN_ON_ONCE(1);
	237	val = 0;
	238	break;
	239	}
	240
	241	return val;
	242	}
	243
	244	static ssize_t ina2xx_show_value(struct device *dev,
	245	struct device_attribute da, char buf)
	246	{
	247	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	248	struct ina2xx_data *data = ina2xx_update_device(dev);
f7c2fe38 FL	249
	250	if (IS_ERR(data))
	251	return PTR_ERR(data);
	252
6106db25 GR	253	return snprintf(buf, PAGE_SIZE, "%d\n",
6106db25 GR	254	ina2xx_get_value(data, attr->index));
f7c2fe38 FL	255	}
	256
	257	/* shunt voltage */
f0df0fd9 GR	258	static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina2xx_show_value, NULL,
f0df0fd9 GR	259	INA2XX_SHUNT_VOLTAGE);
f7c2fe38 FL	260
f7c2fe38 FL	261	/* bus voltage */
f0df0fd9 GR	262	static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina2xx_show_value, NULL,
f0df0fd9 GR	263	INA2XX_BUS_VOLTAGE);
f7c2fe38 FL	264
f7c2fe38 FL	265	/* calculated current */
f0df0fd9 GR	266	static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina2xx_show_value, NULL,
f0df0fd9 GR	267	INA2XX_CURRENT);
f7c2fe38 FL	268
f7c2fe38 FL	269	/* calculated power */
f0df0fd9 GR	270	static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina2xx_show_value, NULL,
f0df0fd9 GR	271	INA2XX_POWER);
f7c2fe38 FL	272
f7c2fe38 FL	273	/* pointers to created device attributes */
468bf0e3	274	static struct attribute *ina2xx_attrs[] = {
f7c2fe38 FL	275	&sensor_dev_attr_in0_input.dev_attr.attr,
	276	&sensor_dev_attr_in1_input.dev_attr.attr,
	277	&sensor_dev_attr_curr1_input.dev_attr.attr,
	278	&sensor_dev_attr_power1_input.dev_attr.attr,
	279	NULL,
	280	};
468bf0e3	281	ATTRIBUTE_GROUPS(ina2xx);
f7c2fe38 FL	282
	283	static int ina2xx_probe(struct i2c_client *client,
	284	const struct i2c_device_id *id)
	285	{
	286	struct i2c_adapter *adapter = client->adapter;
f7c2fe38	287	struct ina2xx_platform_data *pdata;
468bf0e3 GR	288	struct device *dev = &client->dev;
	289	struct ina2xx_data *data;
	290	struct device *hwmon_dev;
468bf0e3	291	u32 val;
f975b339	292	int ret;
f7c2fe38 FL	293
	294	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
	295	return -ENODEV;
	296
468bf0e3	297	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
f7c2fe38 FL	298	if (!data)
	299	return -ENOMEM;
	300
468bf0e3 GR	301	if (dev_get_platdata(dev)) {
468bf0e3 GR	302	pdata = dev_get_platdata(dev);
509416a8	303	data->rshunt = pdata->shunt_uohms;
468bf0e3 GR	304	} else if (!of_property_read_u32(dev->of_node,
468bf0e3 GR	305	"shunt-resistor", &val)) {
509416a8 BG	306	data->rshunt = val;
	307	} else {
	308	data->rshunt = INA2XX_RSHUNT_DEFAULT;
f7c2fe38 FL	309	}
f7c2fe38 FL	310
f7c2fe38 FL	311	/* set the device type */
f7c2fe38 FL	312	data->kind = id->driver_data;
6106db25	313	data->config = &ina2xx_config[data->kind];
509416a8	314	data->client = client;
f7c2fe38	315
509416a8	316	if (data->rshunt <= 0)
f975b339	317	return -ENODEV;
f975b339	318
509416a8	319	ret = ina2xx_init(data);
f975b339	320	if (ret < 0) {
509416a8	321	dev_err(dev, "error configuring the device: %d\n", ret);
f975b339 BG	322	return -ENODEV;
f975b339 BG	323	}
f7c2fe38	324
f7c2fe38 FL	325	mutex_init(&data->update_lock);
f7c2fe38 FL	326
468bf0e3 GR	327	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	328	data, ina2xx_groups);
	329	if (IS_ERR(hwmon_dev))
	330	return PTR_ERR(hwmon_dev);
f7c2fe38	331
468bf0e3	332	dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",
509416a8	333	id->name, data->rshunt);
6106db25	334
f7c2fe38	335	return 0;
f7c2fe38 FL	336	}
	337
	338	static const struct i2c_device_id ina2xx_id[] = {
	339	{ "ina219", ina219 },
dc92cd0c	340	{ "ina220", ina219 },
f7c2fe38	341	{ "ina226", ina226 },
dc92cd0c	342	{ "ina230", ina226 },
f7c2fe38 FL	343	{ }
	344	};
	345	MODULE_DEVICE_TABLE(i2c, ina2xx_id);
	346
	347	static struct i2c_driver ina2xx_driver = {
	348	.driver = {
	349	.name = "ina2xx",
	350	},
	351	.probe = ina2xx_probe,
f7c2fe38 FL	352	.id_table = ina2xx_id,
	353	};
	354
d835ca0f	355	module_i2c_driver(ina2xx_driver);
f7c2fe38 FL	356
	357	MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");
	358	MODULE_DESCRIPTION("ina2xx driver");
	359	MODULE_LICENSE("GPL");