Commit 195a4b42 authored by Il Han's avatar Il Han Committed by Guenter Roeck

hwmon: Driver for Maxim MAX31790

The driver supports the Maxim MAX31790.
Signed-off-by: default avatarIl Han <corone.il.han@gmail.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 25cb62b7
Kernel driver max31790
======================
Supported chips:
* Maxim MAX31790
Prefix: 'max31790'
Addresses scanned: -
Datasheet: http://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf
Author: Il Han <corone.il.han@gmail.com>
Description
-----------
This driver implements support for the Maxim MAX31790 chip.
The MAX31790 controls the speeds of up to six fans using six independent
PWM outputs. The desired fan speeds (or PWM duty cycles) are written
through the I2C interface. The outputs drive "4-wire" fans directly,
or can be used to modulate the fan's power terminals using an external
pass transistor.
Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%)
monitoring and control of fan RPM as well as detection of fan failure.
Six pins are dedicated tachometer inputs. Any of the six PWM outputs can
also be configured to serve as tachometer inputs.
Sysfs entries
-------------
fan[1-12]_input RO fan tachometer speed in RPM
fan[1-12]_fault RO fan experienced fault
fan[1-6]_target RW desired fan speed in RPM
pwm[1-6]_enable RW regulator mode, 0=disabled, 1=manual mode, 2=rpm mode
pwm[1-6] RW fan target duty cycle (0-255)
......@@ -840,6 +840,16 @@ config SENSORS_MAX6697
This driver can also be built as a module. If so, the module
will be called max6697.
config SENSORS_MAX31790
tristate "Maxim MAX31790 sensor chip"
depends on I2C
help
If you say yes here you get support for 6-Channel PWM-Output
Fan RPM Controller.
This driver can also be built as a module. If so, the module
will be called max31790.
config SENSORS_HTU21
tristate "Measurement Specialties HTU21D humidity/temperature sensors"
depends on I2C
......
......@@ -115,6 +115,7 @@ obj-$(CONFIG_SENSORS_MAX6639) += max6639.o
obj-$(CONFIG_SENSORS_MAX6642) += max6642.o
obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
obj-$(CONFIG_SENSORS_MAX6697) += max6697.o
obj-$(CONFIG_SENSORS_MAX31790) += max31790.o
obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o
obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
......
/*
* max31790.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring.
*
* (C) 2015 by Il Han <corone.il.han@gmail.com>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/slab.h>
/* MAX31790 registers */
#define MAX31790_REG_GLOBAL_CONFIG 0x00
#define MAX31790_REG_FAN_CONFIG(ch) (0x02 + (ch))
#define MAX31790_REG_FAN_DYNAMICS(ch) (0x08 + (ch))
#define MAX31790_REG_FAN_FAULT_STATUS2 0x10
#define MAX31790_REG_FAN_FAULT_STATUS1 0x11
#define MAX31790_REG_TACH_COUNT(ch) (0x18 + (ch) * 2)
#define MAX31790_REG_PWM_DUTY_CYCLE(ch) (0x30 + (ch) * 2)
#define MAX31790_REG_PWMOUT(ch) (0x40 + (ch) * 2)
#define MAX31790_REG_TARGET_COUNT(ch) (0x50 + (ch) * 2)
/* Fan Config register bits */
#define MAX31790_FAN_CFG_RPM_MODE 0x80
#define MAX31790_FAN_CFG_TACH_INPUT_EN 0x08
#define MAX31790_FAN_CFG_TACH_INPUT 0x01
/* Fan Dynamics register bits */
#define MAX31790_FAN_DYN_SR_SHIFT 5
#define MAX31790_FAN_DYN_SR_MASK 0xE0
#define SR_FROM_REG(reg) (((reg) & MAX31790_FAN_DYN_SR_MASK) \
>> MAX31790_FAN_DYN_SR_SHIFT)
#define FAN_RPM_MIN 120
#define FAN_RPM_MAX 7864320
#define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \
((60 * (sr) * 8192) / ((reg) >> 4)) : \
FAN_RPM_MAX)
#define RPM_TO_REG(rpm, sr) ((60 * (sr) * 8192) / ((rpm) * 2))
#define NR_CHANNEL 6
/*
* Client data (each client gets its own)
*/
struct max31790_data {
struct i2c_client *client;
struct mutex update_lock;
bool valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* register values */
u8 fan_config[NR_CHANNEL];
u8 fan_dynamics[NR_CHANNEL];
u16 fault_status;
u16 tach[NR_CHANNEL * 2];
u16 pwm[NR_CHANNEL];
u16 target_count[NR_CHANNEL];
};
static struct max31790_data *max31790_update_device(struct device *dev)
{
struct max31790_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
struct max31790_data *ret = data;
int i;
int rv;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
rv = i2c_smbus_read_byte_data(client,
MAX31790_REG_FAN_FAULT_STATUS1);
if (rv < 0)
goto abort;
data->fault_status = rv & 0x3F;
rv = i2c_smbus_read_byte_data(client,
MAX31790_REG_FAN_FAULT_STATUS2);
if (rv < 0)
goto abort;
data->fault_status |= (rv & 0x3F) << 6;
for (i = 0; i < NR_CHANNEL; i++) {
rv = i2c_smbus_read_word_swapped(client,
MAX31790_REG_TACH_COUNT(i));
if (rv < 0)
goto abort;
data->tach[i] = rv;
if (data->fan_config[i]
& MAX31790_FAN_CFG_TACH_INPUT) {
rv = i2c_smbus_read_word_swapped(client,
MAX31790_REG_TACH_COUNT(NR_CHANNEL
+ i));
if (rv < 0)
goto abort;
data->tach[NR_CHANNEL + i] = rv;
} else {
rv = i2c_smbus_read_word_swapped(client,
MAX31790_REG_PWMOUT(i));
if (rv < 0)
goto abort;
data->pwm[i] = rv;
rv = i2c_smbus_read_word_swapped(client,
MAX31790_REG_TARGET_COUNT(i));
if (rv < 0)
goto abort;
data->target_count[i] = rv;
}
}
data->last_updated = jiffies;
data->valid = true;
}
goto done;
abort:
data->valid = false;
ret = ERR_PTR(rv);
done:
mutex_unlock(&data->update_lock);
return ret;
}
static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 };
static u8 get_tach_period(u8 fan_dynamics)
{
return tach_period[SR_FROM_REG(fan_dynamics)];
}
static u8 bits_for_tach_period(int rpm)
{
u8 bits;
if (rpm < 500)
bits = 0x0;
else if (rpm < 1000)
bits = 0x1;
else if (rpm < 2000)
bits = 0x2;
else if (rpm < 4000)
bits = 0x3;
else if (rpm < 8000)
bits = 0x4;
else
bits = 0x5;
return bits;
}
static ssize_t get_fan(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct max31790_data *data = max31790_update_device(dev);
int sr = get_tach_period(data->fan_dynamics[attr->index]);
int rpm;
if (IS_ERR(data))
return PTR_ERR(data);
rpm = RPM_FROM_REG(data->tach[attr->index], sr);
return sprintf(buf, "%d\n", rpm);
}
static ssize_t get_fan_target(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct max31790_data *data = max31790_update_device(dev);
int sr = get_tach_period(data->fan_dynamics[attr->index]);
int rpm;
if (IS_ERR(data))
return PTR_ERR(data);
rpm = RPM_FROM_REG(data->target_count[attr->index], sr);
return sprintf(buf, "%d\n", rpm);
}
static ssize_t set_fan_target(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct max31790_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
u8 bits;
int sr;
int target_count;
unsigned long rpm;
int err;
err = kstrtoul(buf, 10, &rpm);
if (err)
return err;
mutex_lock(&data->update_lock);
rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
bits = bits_for_tach_period(rpm);
data->fan_dynamics[attr->index] =
((data->fan_dynamics[attr->index]
& ~MAX31790_FAN_DYN_SR_MASK)
| (bits << MAX31790_FAN_DYN_SR_SHIFT));
err = i2c_smbus_write_byte_data(client,
MAX31790_REG_FAN_DYNAMICS(attr->index),
data->fan_dynamics[attr->index]);
if (err < 0) {
mutex_unlock(&data->update_lock);
return err;
}
sr = get_tach_period(data->fan_dynamics[attr->index]);
target_count = RPM_TO_REG(rpm, sr);
target_count = clamp_val(target_count, 0x1, 0x7FF);
data->target_count[attr->index] = target_count << 5;
err = i2c_smbus_write_word_swapped(client,
MAX31790_REG_TARGET_COUNT(attr->index),
data->target_count[attr->index]);
mutex_unlock(&data->update_lock);
if (err < 0)
return err;
return count;
}
static ssize_t get_pwm(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct max31790_data *data = max31790_update_device(dev);
int pwm;
if (IS_ERR(data))
return PTR_ERR(data);
pwm = data->pwm[attr->index] >> 8;
return sprintf(buf, "%d\n", pwm);
}
static ssize_t set_pwm(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct max31790_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
unsigned long pwm;
int err;
err = kstrtoul(buf, 10, &pwm);
if (err)
return err;
if (pwm > 255)
return -EINVAL;
mutex_lock(&data->update_lock);
data->pwm[attr->index] = pwm << 8;
err = i2c_smbus_write_word_swapped(client,
MAX31790_REG_PWMOUT(attr->index),
data->pwm[attr->index]);
mutex_unlock(&data->update_lock);
if (err < 0)
return err;
return count;
}
static ssize_t get_pwm_enable(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct max31790_data *data = max31790_update_device(dev);
int mode;
if (IS_ERR(data))
return PTR_ERR(data);
if (data->fan_config[attr->index] & MAX31790_FAN_CFG_RPM_MODE)
mode = 2;
else if (data->fan_config[attr->index] & MAX31790_FAN_CFG_TACH_INPUT_EN)
mode = 1;
else
mode = 0;
return sprintf(buf, "%d\n", mode);
}
static ssize_t set_pwm_enable(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct max31790_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
unsigned long mode;
int err;
err = kstrtoul(buf, 10, &mode);
if (err)
return err;
switch (mode) {
case 0:
data->fan_config[attr->index] =
data->fan_config[attr->index]
& ~(MAX31790_FAN_CFG_TACH_INPUT_EN
| MAX31790_FAN_CFG_RPM_MODE);
break;
case 1:
data->fan_config[attr->index] =
(data->fan_config[attr->index]
| MAX31790_FAN_CFG_TACH_INPUT_EN)
& ~MAX31790_FAN_CFG_RPM_MODE;
break;
case 2:
data->fan_config[attr->index] =
data->fan_config[attr->index]
| MAX31790_FAN_CFG_TACH_INPUT_EN
| MAX31790_FAN_CFG_RPM_MODE;
break;
default:
return -EINVAL;
}
mutex_lock(&data->update_lock);
err = i2c_smbus_write_byte_data(client,
MAX31790_REG_FAN_CONFIG(attr->index),
data->fan_config[attr->index]);
mutex_unlock(&data->update_lock);
if (err < 0)
return err;
return count;
}
static ssize_t get_fan_fault(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct max31790_data *data = max31790_update_device(dev);
int fault;
if (IS_ERR(data))
return PTR_ERR(data);
fault = !!(data->fault_status & (1 << attr->index));
return sprintf(buf, "%d\n", fault);
}
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3);
static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, get_fan, NULL, 4);
static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, get_fan, NULL, 5);
static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_fault, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, get_fan_fault, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, get_fan_fault, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, get_fan_fault, NULL, 3);
static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, get_fan_fault, NULL, 4);
static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, get_fan_fault, NULL, 5);
static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, get_fan, NULL, 6);
static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, get_fan, NULL, 7);
static SENSOR_DEVICE_ATTR(fan9_input, S_IRUGO, get_fan, NULL, 8);
static SENSOR_DEVICE_ATTR(fan10_input, S_IRUGO, get_fan, NULL, 9);
static SENSOR_DEVICE_ATTR(fan11_input, S_IRUGO, get_fan, NULL, 10);
static SENSOR_DEVICE_ATTR(fan12_input, S_IRUGO, get_fan, NULL, 11);
static SENSOR_DEVICE_ATTR(fan7_fault, S_IRUGO, get_fan_fault, NULL, 6);
static SENSOR_DEVICE_ATTR(fan8_fault, S_IRUGO, get_fan_fault, NULL, 7);
static SENSOR_DEVICE_ATTR(fan9_fault, S_IRUGO, get_fan_fault, NULL, 8);
static SENSOR_DEVICE_ATTR(fan10_fault, S_IRUGO, get_fan_fault, NULL, 9);
static SENSOR_DEVICE_ATTR(fan11_fault, S_IRUGO, get_fan_fault, NULL, 10);
static SENSOR_DEVICE_ATTR(fan12_fault, S_IRUGO, get_fan_fault, NULL, 11);
static SENSOR_DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO,
get_fan_target, set_fan_target, 0);
static SENSOR_DEVICE_ATTR(fan2_target, S_IWUSR | S_IRUGO,
get_fan_target, set_fan_target, 1);
static SENSOR_DEVICE_ATTR(fan3_target, S_IWUSR | S_IRUGO,
get_fan_target, set_fan_target, 2);
static SENSOR_DEVICE_ATTR(fan4_target, S_IWUSR | S_IRUGO,
get_fan_target, set_fan_target, 3);
static SENSOR_DEVICE_ATTR(fan5_target, S_IWUSR | S_IRUGO,
get_fan_target, set_fan_target, 4);
static SENSOR_DEVICE_ATTR(fan6_target, S_IWUSR | S_IRUGO,
get_fan_target, set_fan_target, 5);
static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 0);
static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 1);
static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 2);
static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 3);
static SENSOR_DEVICE_ATTR(pwm5, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 4);
static SENSOR_DEVICE_ATTR(pwm6, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 5);
static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
get_pwm_enable, set_pwm_enable, 0);
static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO,
get_pwm_enable, set_pwm_enable, 1);
static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO,
get_pwm_enable, set_pwm_enable, 2);
static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO,
get_pwm_enable, set_pwm_enable, 3);
static SENSOR_DEVICE_ATTR(pwm5_enable, S_IWUSR | S_IRUGO,
get_pwm_enable, set_pwm_enable, 4);
static SENSOR_DEVICE_ATTR(pwm6_enable, S_IWUSR | S_IRUGO,
get_pwm_enable, set_pwm_enable, 5);
static struct attribute *max31790_attrs[] = {
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan2_input.dev_attr.attr,
&sensor_dev_attr_fan3_input.dev_attr.attr,
&sensor_dev_attr_fan4_input.dev_attr.attr,
&sensor_dev_attr_fan5_input.dev_attr.attr,
&sensor_dev_attr_fan6_input.dev_attr.attr,
&sensor_dev_attr_fan1_fault.dev_attr.attr,
&sensor_dev_attr_fan2_fault.dev_attr.attr,
&sensor_dev_attr_fan3_fault.dev_attr.attr,
&sensor_dev_attr_fan4_fault.dev_attr.attr,
&sensor_dev_attr_fan5_fault.dev_attr.attr,
&sensor_dev_attr_fan6_fault.dev_attr.attr,
&sensor_dev_attr_fan7_input.dev_attr.attr,
&sensor_dev_attr_fan8_input.dev_attr.attr,
&sensor_dev_attr_fan9_input.dev_attr.attr,
&sensor_dev_attr_fan10_input.dev_attr.attr,
&sensor_dev_attr_fan11_input.dev_attr.attr,
&sensor_dev_attr_fan12_input.dev_attr.attr,
&sensor_dev_attr_fan7_fault.dev_attr.attr,
&sensor_dev_attr_fan8_fault.dev_attr.attr,
&sensor_dev_attr_fan9_fault.dev_attr.attr,
&sensor_dev_attr_fan10_fault.dev_attr.attr,
&sensor_dev_attr_fan11_fault.dev_attr.attr,
&sensor_dev_attr_fan12_fault.dev_attr.attr,
&sensor_dev_attr_fan1_target.dev_attr.attr,
&sensor_dev_attr_fan2_target.dev_attr.attr,
&sensor_dev_attr_fan3_target.dev_attr.attr,
&sensor_dev_attr_fan4_target.dev_attr.attr,
&sensor_dev_attr_fan5_target.dev_attr.attr,
&sensor_dev_attr_fan6_target.dev_attr.attr,
&sensor_dev_attr_pwm1.dev_attr.attr,
&sensor_dev_attr_pwm2.dev_attr.attr,
&sensor_dev_attr_pwm3.dev_attr.attr,
&sensor_dev_attr_pwm4.dev_attr.attr,
&sensor_dev_attr_pwm5.dev_attr.attr,
&sensor_dev_attr_pwm6.dev_attr.attr,
&sensor_dev_attr_pwm1_enable.dev_attr.attr,
&sensor_dev_attr_pwm2_enable.dev_attr.attr,
&sensor_dev_attr_pwm3_enable.dev_attr.attr,
&sensor_dev_attr_pwm4_enable.dev_attr.attr,
&sensor_dev_attr_pwm5_enable.dev_attr.attr,
&sensor_dev_attr_pwm6_enable.dev_attr.attr,
NULL
};
static umode_t max31790_attrs_visible(struct kobject *kobj,
struct attribute *a, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct max31790_data *data = dev_get_drvdata(dev);
struct device_attribute *devattr =
container_of(a, struct device_attribute, attr);
int index = to_sensor_dev_attr(devattr)->index % NR_CHANNEL;
u8 fan_config;
fan_config = data->fan_config[index];
if (n >= NR_CHANNEL * 2 && n < NR_CHANNEL * 4 &&
!(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
return 0;
if (n >= NR_CHANNEL * 4 && (fan_config & MAX31790_FAN_CFG_TACH_INPUT))
return 0;
return a->mode;
}
static const struct attribute_group max31790_group = {
.attrs = max31790_attrs,
.is_visible = max31790_attrs_visible,
};
__ATTRIBUTE_GROUPS(max31790);
static int max31790_init_client(struct i2c_client *client,
struct max31790_data *data)
{
int i, rv;
for (i = 0; i < NR_CHANNEL; i++) {
rv = i2c_smbus_read_byte_data(client,
MAX31790_REG_FAN_CONFIG(i));
if (rv < 0)
return rv;
data->fan_config[i] = rv;
rv = i2c_smbus_read_byte_data(client,
MAX31790_REG_FAN_DYNAMICS(i));
if (rv < 0)
return rv;
data->fan_dynamics[i] = rv;
}
return 0;
}
static int max31790_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = client->adapter;
struct device *dev = &client->dev;
struct max31790_data *data;
struct device *hwmon_dev;
int err;
if (!i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
return -ENODEV;
data = devm_kzalloc(dev, sizeof(struct max31790_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
mutex_init(&data->update_lock);
/*
* Initialize the max31790 chip
*/
err = max31790_init_client(client, data);
if (err)
return err;
hwmon_dev = devm_hwmon_device_register_with_groups(dev,
client->name, data, max31790_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id max31790_id[] = {
{ "max31790", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max31790_id);
static struct i2c_driver max31790_driver = {
.class = I2C_CLASS_HWMON,
.probe = max31790_probe,
.driver = {
.name = "max31790",
},
.id_table = max31790_id,
};
module_i2c_driver(max31790_driver);
MODULE_AUTHOR("Il Han <corone.il.han@gmail.com>");
MODULE_DESCRIPTION("MAX31790 sensor driver");
MODULE_LICENSE("GPL");
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