280 lines
7.3 KiB
C
280 lines
7.3 KiB
C
// 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)
|
|
{
|
|
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_new = 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");
|