drivers/hwmon/ltc2990.c - fs/xfs/xfs-linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Driver for Linear Technology LTC2990 power monitor
  *
  * Copyright (C) 2014 Topic Embedded Products
  * Author: Mike Looijmans <mike.looijmans@topic.nl>
  */

 #include <linux/bitops.h>
 #include <linux/err.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/i2c.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/property.h>

 #define LTC2990_STATUS	0x00
 #define LTC2990_CONTROL	0x01
 #define LTC2990_TRIGGER	0x02
 #define LTC2990_TINT_MSB	0x04
 #define LTC2990_V1_MSB	0x06
 #define LTC2990_V2_MSB	0x08
 #define LTC2990_V3_MSB	0x0A
 #define LTC2990_V4_MSB	0x0C
 #define LTC2990_VCC_MSB	0x0E

 #define LTC2990_IN0	BIT(0)
 #define LTC2990_IN1	BIT(1)
 #define LTC2990_IN2	BIT(2)
 #define LTC2990_IN3	BIT(3)
 #define LTC2990_IN4	BIT(4)
 #define LTC2990_CURR1	BIT(5)
 #define LTC2990_CURR2	BIT(6)
 #define LTC2990_TEMP1	BIT(7)
 #define LTC2990_TEMP2	BIT(8)
 #define LTC2990_TEMP3	BIT(9)
 #define LTC2990_NONE	0
 #define LTC2990_ALL	GENMASK(9, 0)

 #define LTC2990_MODE0_SHIFT	0
 #define LTC2990_MODE0_MASK	GENMASK(2, 0)
 #define LTC2990_MODE1_SHIFT	3
 #define LTC2990_MODE1_MASK	GENMASK(1, 0)

 /* Enabled measurements for mode bits 2..0 */
 static const int ltc2990_attrs_ena_0[] = {
 	LTC2990_IN1 | LTC2990_IN2 | LTC2990_TEMP3,
 	LTC2990_CURR1 | LTC2990_TEMP3,
 	LTC2990_CURR1 | LTC2990_IN3 | LTC2990_IN4,
 	LTC2990_TEMP2 | LTC2990_IN3 | LTC2990_IN4,
 	LTC2990_TEMP2 | LTC2990_CURR2,
 	LTC2990_TEMP2 | LTC2990_TEMP3,
 	LTC2990_CURR1 | LTC2990_CURR2,
 	LTC2990_IN1 | LTC2990_IN2 | LTC2990_IN3 | LTC2990_IN4
 };

 /* Enabled measurements for mode bits 4..3 */
 static const int ltc2990_attrs_ena_1[] = {
 	LTC2990_NONE,
 	LTC2990_TEMP2 | LTC2990_IN1 | LTC2990_CURR1,
 	LTC2990_TEMP3 | LTC2990_IN3 | LTC2990_CURR2,
 	LTC2990_ALL
 };

 struct ltc2990_data {
 	struct i2c_client *i2c;
 	u32 mode[2];
 };

 /* Return the converted value from the given register in uV or mC */
 static int ltc2990_get_value(struct i2c_client *i2c, int index, int *result)
 {
 	int val;
 	u8 reg;

 	switch (index) {
 	case LTC2990_IN0:
 		reg = LTC2990_VCC_MSB;
 		break;
 	case LTC2990_IN1:
 	case LTC2990_CURR1:
 	case LTC2990_TEMP2:
 		reg = LTC2990_V1_MSB;
 		break;
 	case LTC2990_IN2:
 		reg = LTC2990_V2_MSB;
 		break;
 	case LTC2990_IN3:
 	case LTC2990_CURR2:
 	case LTC2990_TEMP3:
 		reg = LTC2990_V3_MSB;
 		break;
 	case LTC2990_IN4:
 		reg = LTC2990_V4_MSB;
 		break;
 	case LTC2990_TEMP1:
 		reg = LTC2990_TINT_MSB;
 		break;
 	default:
 		return -EINVAL;
 	}

 	val = i2c_smbus_read_word_swapped(i2c, reg);
 	if (unlikely(val < 0))
 		return val;

 	switch (index) {
 	case LTC2990_TEMP1:
 	case LTC2990_TEMP2:
 	case LTC2990_TEMP3:
 		/* temp, 0.0625 degrees/LSB */
 		*result = sign_extend32(val, 12) * 1000 / 16;
 		break;
 	case LTC2990_CURR1:
 	case LTC2990_CURR2:
 		 /* Vx-Vy, 19.42uV/LSB */
 		*result = sign_extend32(val, 14) * 1942 / 100;
 		break;
 	case LTC2990_IN0:
 		/* Vcc, 305.18uV/LSB, 2.5V offset */
 		*result = sign_extend32(val, 14) * 30518 / (100 * 1000) + 2500;
 		break;
 	case LTC2990_IN1:
 	case LTC2990_IN2:
 	case LTC2990_IN3:
 	case LTC2990_IN4:
 		/* Vx, 305.18uV/LSB */
 		*result = sign_extend32(val, 14) * 30518 / (100 * 1000);
 		break;
 	default:
 		return -EINVAL; /* won't happen, keep compiler happy */
 	}

 	return 0;
 }

 static ssize_t ltc2990_value_show(struct device *dev,
 				  struct device_attribute *da, char *buf)
 {
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 	struct ltc2990_data *data = dev_get_drvdata(dev);
 	int value;
 	int ret;

 	ret = ltc2990_get_value(data->i2c, attr->index, &value);
 	if (unlikely(ret < 0))
 		return ret;

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

 static umode_t ltc2990_attrs_visible(struct kobject *kobj,
 				     struct attribute *a, int n)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
 	struct ltc2990_data *data = dev_get_drvdata(dev);
 	struct device_attribute *da =
 			container_of(a, struct device_attribute, attr);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);

 	int attrs_mask = LTC2990_IN0 | LTC2990_TEMP1 |
 			 (ltc2990_attrs_ena_0[data->mode[0]] &
 			  ltc2990_attrs_ena_1[data->mode[1]]);

 	if (attr->index & attrs_mask)
 		return a->mode;

 	return 0;
 }

 static SENSOR_DEVICE_ATTR_RO(temp1_input, ltc2990_value, LTC2990_TEMP1);
 static SENSOR_DEVICE_ATTR_RO(temp2_input, ltc2990_value, LTC2990_TEMP2);
 static SENSOR_DEVICE_ATTR_RO(temp3_input, ltc2990_value, LTC2990_TEMP3);
 static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2990_value, LTC2990_CURR1);
 static SENSOR_DEVICE_ATTR_RO(curr2_input, ltc2990_value, LTC2990_CURR2);
 static SENSOR_DEVICE_ATTR_RO(in0_input, ltc2990_value, LTC2990_IN0);
 static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2990_value, LTC2990_IN1);
 static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2990_value, LTC2990_IN2);
 static SENSOR_DEVICE_ATTR_RO(in3_input, ltc2990_value, LTC2990_IN3);
 static SENSOR_DEVICE_ATTR_RO(in4_input, ltc2990_value, LTC2990_IN4);

 static struct attribute *ltc2990_attrs[] = {
 	&sensor_dev_attr_temp1_input.dev_attr.attr,
 	&sensor_dev_attr_temp2_input.dev_attr.attr,
 	&sensor_dev_attr_temp3_input.dev_attr.attr,
 	&sensor_dev_attr_curr1_input.dev_attr.attr,
 	&sensor_dev_attr_curr2_input.dev_attr.attr,
 	&sensor_dev_attr_in0_input.dev_attr.attr,
 	&sensor_dev_attr_in1_input.dev_attr.attr,
 	&sensor_dev_attr_in2_input.dev_attr.attr,
 	&sensor_dev_attr_in3_input.dev_attr.attr,
 	&sensor_dev_attr_in4_input.dev_attr.attr,
 	NULL,
 };

 static const struct attribute_group ltc2990_group = {
 	.attrs = ltc2990_attrs,
 	.is_visible = ltc2990_attrs_visible,
 };
 __ATTRIBUTE_GROUPS(ltc2990);

 static int ltc2990_i2c_probe(struct i2c_client *i2c,
 			     const struct i2c_device_id *id)
 {
 	int ret;
 	struct device *hwmon_dev;
 	struct ltc2990_data *data;

 	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 				     I2C_FUNC_SMBUS_WORD_DATA))
 		return -ENODEV;

 	data = devm_kzalloc(&i2c->dev, sizeof(struct ltc2990_data), GFP_KERNEL);
 	if (unlikely(!data))
 		return -ENOMEM;

 	data->i2c = i2c;

 	if (dev_fwnode(&i2c->dev)) {
 		ret = device_property_read_u32_array(&i2c->dev,
 						     "lltc,meas-mode",
 						     data->mode, 2);
 		if (ret < 0)
 			return ret;

 		if (data->mode[0] & ~LTC2990_MODE0_MASK ||
 		    data->mode[1] & ~LTC2990_MODE1_MASK)
 			return -EINVAL;
 	} else {
 		ret = i2c_smbus_read_byte_data(i2c, LTC2990_CONTROL);
 		if (ret < 0)
 			return ret;

 		data->mode[0] = ret >> LTC2990_MODE0_SHIFT & LTC2990_MODE0_MASK;
 		data->mode[1] = ret >> LTC2990_MODE1_SHIFT & LTC2990_MODE1_MASK;
 	}

 	/* Setup continuous mode */
 	ret = i2c_smbus_write_byte_data(i2c, LTC2990_CONTROL,
 					data->mode[0] << LTC2990_MODE0_SHIFT |
 					data->mode[1] << LTC2990_MODE1_SHIFT);
 	if (ret < 0) {
 		dev_err(&i2c->dev, "Error: Failed to set control mode.\n");
 		return ret;
 	}
 	/* Trigger once to start continuous conversion */
 	ret = i2c_smbus_write_byte_data(i2c, LTC2990_TRIGGER, 1);
 	if (ret < 0) {
 		dev_err(&i2c->dev, "Error: Failed to start acquisition.\n");
 		return ret;
 	}

 	hwmon_dev = devm_hwmon_device_register_with_groups(&i2c->dev,
 							   i2c->name,
 							   data,
 							   ltc2990_groups);

 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }

 static const struct i2c_device_id ltc2990_i2c_id[] = {
 	{ "ltc2990", 0 },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, ltc2990_i2c_id);

 static struct i2c_driver ltc2990_i2c_driver = {
 	.driver = {
 		.name = "ltc2990",
 	},
 	.probe    = ltc2990_i2c_probe,
 	.id_table = ltc2990_i2c_id,
 };

 module_i2c_driver(ltc2990_i2c_driver);

 MODULE_DESCRIPTION("LTC2990 Sensor Driver");
 MODULE_AUTHOR("Topic Embedded Products");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Driver for Linear Technology LTC2990 power monitor
	*
	* Copyright (C) 2014 Topic Embedded Products
	* Author: Mike Looijmans <mike.looijmans@topic.nl>
	*/

	#include <linux/bitops.h>
	#include <linux/err.h>
	#include <linux/hwmon.h>
	#include <linux/hwmon-sysfs.h>
	#include <linux/i2c.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/property.h>

	#define LTC2990_STATUS 0x00
	#define LTC2990_CONTROL 0x01
	#define LTC2990_TRIGGER 0x02
	#define LTC2990_TINT_MSB 0x04
	#define LTC2990_V1_MSB 0x06
	#define LTC2990_V2_MSB 0x08
	#define LTC2990_V3_MSB 0x0A
	#define LTC2990_V4_MSB 0x0C
	#define LTC2990_VCC_MSB 0x0E

	#define LTC2990_IN0 BIT(0)
	#define LTC2990_IN1 BIT(1)
	#define LTC2990_IN2 BIT(2)
	#define LTC2990_IN3 BIT(3)
	#define LTC2990_IN4 BIT(4)
	#define LTC2990_CURR1 BIT(5)
	#define LTC2990_CURR2 BIT(6)
	#define LTC2990_TEMP1 BIT(7)
	#define LTC2990_TEMP2 BIT(8)
	#define LTC2990_TEMP3 BIT(9)
	#define LTC2990_NONE 0
	#define LTC2990_ALL GENMASK(9, 0)

	#define LTC2990_MODE0_SHIFT 0
	#define LTC2990_MODE0_MASK GENMASK(2, 0)
	#define LTC2990_MODE1_SHIFT 3
	#define LTC2990_MODE1_MASK GENMASK(1, 0)

	/* Enabled measurements for mode bits 2..0 */
	static const int ltc2990_attrs_ena_0[] = {
	LTC2990_IN1 \| LTC2990_IN2 \| LTC2990_TEMP3,
	LTC2990_CURR1 \| LTC2990_TEMP3,
	LTC2990_CURR1 \| LTC2990_IN3 \| LTC2990_IN4,
	LTC2990_TEMP2 \| LTC2990_IN3 \| LTC2990_IN4,
	LTC2990_TEMP2 \| LTC2990_CURR2,
	LTC2990_TEMP2 \| LTC2990_TEMP3,
	LTC2990_CURR1 \| LTC2990_CURR2,
	LTC2990_IN1 \| LTC2990_IN2 \| LTC2990_IN3 \| LTC2990_IN4
	};

	/* Enabled measurements for mode bits 4..3 */
	static const int ltc2990_attrs_ena_1[] = {
	LTC2990_NONE,
	LTC2990_TEMP2 \| LTC2990_IN1 \| LTC2990_CURR1,
	LTC2990_TEMP3 \| LTC2990_IN3 \| LTC2990_CURR2,
	LTC2990_ALL
	};

	struct ltc2990_data {
	struct i2c_client *i2c;
	u32 mode[2];
	};

	/* Return the converted value from the given register in uV or mC */
	static int ltc2990_get_value(struct i2c_client i2c, int index, int result)
	{
	int val;
	u8 reg;

	switch (index) {
	case LTC2990_IN0:
	reg = LTC2990_VCC_MSB;
	break;
	case LTC2990_IN1:
	case LTC2990_CURR1:
	case LTC2990_TEMP2:
	reg = LTC2990_V1_MSB;
	break;
	case LTC2990_IN2:
	reg = LTC2990_V2_MSB;
	break;
	case LTC2990_IN3:
	case LTC2990_CURR2:
	case LTC2990_TEMP3:
	reg = LTC2990_V3_MSB;
	break;
	case LTC2990_IN4:
	reg = LTC2990_V4_MSB;
	break;
	case LTC2990_TEMP1:
	reg = LTC2990_TINT_MSB;
	break;
	default:
	return -EINVAL;
	}

	val = i2c_smbus_read_word_swapped(i2c, reg);
	if (unlikely(val < 0))
	return val;

	switch (index) {
	case LTC2990_TEMP1:
	case LTC2990_TEMP2:
	case LTC2990_TEMP3:
	/* temp, 0.0625 degrees/LSB */
	result = sign_extend32(val, 12) 1000 / 16;
	break;
	case LTC2990_CURR1:
	case LTC2990_CURR2:
	/* Vx-Vy, 19.42uV/LSB */
	result = sign_extend32(val, 14) 1942 / 100;
	break;
	case LTC2990_IN0:
	/* Vcc, 305.18uV/LSB, 2.5V offset */
	result = sign_extend32(val, 14) 30518 / (100 * 1000) + 2500;
	break;
	case LTC2990_IN1:
	case LTC2990_IN2:
	case LTC2990_IN3:
	case LTC2990_IN4:
	/* Vx, 305.18uV/LSB */
	result = sign_extend32(val, 14) 30518 / (100 * 1000);
	break;
	default:
	return -EINVAL; /* won't happen, keep compiler happy */
	}

	return 0;
	}

	static ssize_t ltc2990_value_show(struct device *dev,
	struct device_attribute da, char buf)
	{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct ltc2990_data *data = dev_get_drvdata(dev);
	int value;
	int ret;

	ret = ltc2990_get_value(data->i2c, attr->index, &value);
	if (unlikely(ret < 0))
	return ret;

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

	static umode_t ltc2990_attrs_visible(struct kobject *kobj,
	struct attribute *a, int n)
	{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct ltc2990_data *data = dev_get_drvdata(dev);
	struct device_attribute *da =
	container_of(a, struct device_attribute, attr);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);

	int attrs_mask = LTC2990_IN0 \| LTC2990_TEMP1 \|
	(ltc2990_attrs_ena_0[data->mode[0]] &
	ltc2990_attrs_ena_1[data->mode[1]]);

	if (attr->index & attrs_mask)
	return a->mode;

	return 0;
	}

	static SENSOR_DEVICE_ATTR_RO(temp1_input, ltc2990_value, LTC2990_TEMP1);
	static SENSOR_DEVICE_ATTR_RO(temp2_input, ltc2990_value, LTC2990_TEMP2);
	static SENSOR_DEVICE_ATTR_RO(temp3_input, ltc2990_value, LTC2990_TEMP3);
	static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2990_value, LTC2990_CURR1);
	static SENSOR_DEVICE_ATTR_RO(curr2_input, ltc2990_value, LTC2990_CURR2);
	static SENSOR_DEVICE_ATTR_RO(in0_input, ltc2990_value, LTC2990_IN0);
	static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2990_value, LTC2990_IN1);
	static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2990_value, LTC2990_IN2);
	static SENSOR_DEVICE_ATTR_RO(in3_input, ltc2990_value, LTC2990_IN3);
	static SENSOR_DEVICE_ATTR_RO(in4_input, ltc2990_value, LTC2990_IN4);

	static struct attribute *ltc2990_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_curr1_input.dev_attr.attr,
	&sensor_dev_attr_curr2_input.dev_attr.attr,
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in4_input.dev_attr.attr,
	NULL,
	};

	static const struct attribute_group ltc2990_group = {
	.attrs = ltc2990_attrs,
	.is_visible = ltc2990_attrs_visible,
	};
	__ATTRIBUTE_GROUPS(ltc2990);

	static int ltc2990_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	int ret;
	struct device *hwmon_dev;
	struct ltc2990_data *data;

	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
	I2C_FUNC_SMBUS_WORD_DATA))
	return -ENODEV;

	data = devm_kzalloc(&i2c->dev, sizeof(struct ltc2990_data), GFP_KERNEL);
	if (unlikely(!data))
	return -ENOMEM;

	data->i2c = i2c;

	if (dev_fwnode(&i2c->dev)) {
	ret = device_property_read_u32_array(&i2c->dev,
	"lltc,meas-mode",
	data->mode, 2);
	if (ret < 0)
	return ret;

	if (data->mode[0] & ~LTC2990_MODE0_MASK \|\|
	data->mode[1] & ~LTC2990_MODE1_MASK)
	return -EINVAL;
	} else {
	ret = i2c_smbus_read_byte_data(i2c, LTC2990_CONTROL);
	if (ret < 0)
	return ret;

	data->mode[0] = ret >> LTC2990_MODE0_SHIFT & LTC2990_MODE0_MASK;
	data->mode[1] = ret >> LTC2990_MODE1_SHIFT & LTC2990_MODE1_MASK;
	}

	/* Setup continuous mode */
	ret = i2c_smbus_write_byte_data(i2c, LTC2990_CONTROL,
	data->mode[0] << LTC2990_MODE0_SHIFT \|
	data->mode[1] << LTC2990_MODE1_SHIFT);
	if (ret < 0) {
	dev_err(&i2c->dev, "Error: Failed to set control mode.\n");
	return ret;
	}
	/* Trigger once to start continuous conversion */
	ret = i2c_smbus_write_byte_data(i2c, LTC2990_TRIGGER, 1);
	if (ret < 0) {
	dev_err(&i2c->dev, "Error: Failed to start acquisition.\n");
	return ret;
	}

	hwmon_dev = devm_hwmon_device_register_with_groups(&i2c->dev,
	i2c->name,
	data,
	ltc2990_groups);

	return PTR_ERR_OR_ZERO(hwmon_dev);
	}

	static const struct i2c_device_id ltc2990_i2c_id[] = {
	{ "ltc2990", 0 },
	{}
	};
	MODULE_DEVICE_TABLE(i2c, ltc2990_i2c_id);

	static struct i2c_driver ltc2990_i2c_driver = {
	.driver = {
	.name = "ltc2990",
	},
	.probe = ltc2990_i2c_probe,
	.id_table = ltc2990_i2c_id,
	};

	module_i2c_driver(ltc2990_i2c_driver);

	MODULE_DESCRIPTION("LTC2990 Sensor Driver");
	MODULE_AUTHOR("Topic Embedded Products");
	MODULE_LICENSE("GPL v2");