533 lines
12 KiB
C
533 lines
12 KiB
C
/*
|
|
* 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/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 int max31790_read_fan(struct device *dev, u32 attr, int channel,
|
|
long *val)
|
|
{
|
|
struct max31790_data *data = max31790_update_device(dev);
|
|
int sr, rpm;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
switch (attr) {
|
|
case hwmon_fan_input:
|
|
sr = get_tach_period(data->fan_dynamics[channel]);
|
|
rpm = RPM_FROM_REG(data->tach[channel], sr);
|
|
*val = rpm;
|
|
return 0;
|
|
case hwmon_fan_target:
|
|
sr = get_tach_period(data->fan_dynamics[channel]);
|
|
rpm = RPM_FROM_REG(data->target_count[channel], sr);
|
|
*val = rpm;
|
|
return 0;
|
|
case hwmon_fan_fault:
|
|
*val = !!(data->fault_status & (1 << channel));
|
|
return 0;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
static int max31790_write_fan(struct device *dev, u32 attr, int channel,
|
|
long val)
|
|
{
|
|
struct max31790_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
int target_count;
|
|
int err = 0;
|
|
u8 bits;
|
|
int sr;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
switch (attr) {
|
|
case hwmon_fan_target:
|
|
val = clamp_val(val, FAN_RPM_MIN, FAN_RPM_MAX);
|
|
bits = bits_for_tach_period(val);
|
|
data->fan_dynamics[channel] =
|
|
((data->fan_dynamics[channel] &
|
|
~MAX31790_FAN_DYN_SR_MASK) |
|
|
(bits << MAX31790_FAN_DYN_SR_SHIFT));
|
|
err = i2c_smbus_write_byte_data(client,
|
|
MAX31790_REG_FAN_DYNAMICS(channel),
|
|
data->fan_dynamics[channel]);
|
|
if (err < 0)
|
|
break;
|
|
|
|
sr = get_tach_period(data->fan_dynamics[channel]);
|
|
target_count = RPM_TO_REG(val, sr);
|
|
target_count = clamp_val(target_count, 0x1, 0x7FF);
|
|
|
|
data->target_count[channel] = target_count << 5;
|
|
|
|
err = i2c_smbus_write_word_swapped(client,
|
|
MAX31790_REG_TARGET_COUNT(channel),
|
|
data->target_count[channel]);
|
|
break;
|
|
default:
|
|
err = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
|
|
{
|
|
const struct max31790_data *data = _data;
|
|
u8 fan_config = data->fan_config[channel % NR_CHANNEL];
|
|
|
|
switch (attr) {
|
|
case hwmon_fan_input:
|
|
case hwmon_fan_fault:
|
|
if (channel < NR_CHANNEL ||
|
|
(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
|
|
return S_IRUGO;
|
|
return 0;
|
|
case hwmon_fan_target:
|
|
if (channel < NR_CHANNEL &&
|
|
!(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
|
|
return S_IRUGO | S_IWUSR;
|
|
return 0;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
|
|
long *val)
|
|
{
|
|
struct max31790_data *data = max31790_update_device(dev);
|
|
u8 fan_config;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
fan_config = data->fan_config[channel];
|
|
|
|
switch (attr) {
|
|
case hwmon_pwm_input:
|
|
*val = data->pwm[channel] >> 8;
|
|
return 0;
|
|
case hwmon_pwm_enable:
|
|
if (fan_config & MAX31790_FAN_CFG_RPM_MODE)
|
|
*val = 2;
|
|
else if (fan_config & MAX31790_FAN_CFG_TACH_INPUT_EN)
|
|
*val = 1;
|
|
else
|
|
*val = 0;
|
|
return 0;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
|
|
long val)
|
|
{
|
|
struct max31790_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
u8 fan_config;
|
|
int err = 0;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
switch (attr) {
|
|
case hwmon_pwm_input:
|
|
if (val < 0 || val > 255) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
data->pwm[channel] = val << 8;
|
|
err = i2c_smbus_write_word_swapped(client,
|
|
MAX31790_REG_PWMOUT(channel),
|
|
data->pwm[channel]);
|
|
break;
|
|
case hwmon_pwm_enable:
|
|
fan_config = data->fan_config[channel];
|
|
if (val == 0) {
|
|
fan_config &= ~(MAX31790_FAN_CFG_TACH_INPUT_EN |
|
|
MAX31790_FAN_CFG_RPM_MODE);
|
|
} else if (val == 1) {
|
|
fan_config = (fan_config |
|
|
MAX31790_FAN_CFG_TACH_INPUT_EN) &
|
|
~MAX31790_FAN_CFG_RPM_MODE;
|
|
} else if (val == 2) {
|
|
fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN |
|
|
MAX31790_FAN_CFG_RPM_MODE;
|
|
} else {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
data->fan_config[channel] = fan_config;
|
|
err = i2c_smbus_write_byte_data(client,
|
|
MAX31790_REG_FAN_CONFIG(channel),
|
|
fan_config);
|
|
break;
|
|
default:
|
|
err = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static umode_t max31790_pwm_is_visible(const void *_data, u32 attr, int channel)
|
|
{
|
|
const struct max31790_data *data = _data;
|
|
u8 fan_config = data->fan_config[channel];
|
|
|
|
switch (attr) {
|
|
case hwmon_pwm_input:
|
|
case hwmon_pwm_enable:
|
|
if (!(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
|
|
return S_IRUGO | S_IWUSR;
|
|
return 0;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int max31790_read(struct device *dev, enum hwmon_sensor_types type,
|
|
u32 attr, int channel, long *val)
|
|
{
|
|
switch (type) {
|
|
case hwmon_fan:
|
|
return max31790_read_fan(dev, attr, channel, val);
|
|
case hwmon_pwm:
|
|
return max31790_read_pwm(dev, attr, channel, val);
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
static int max31790_write(struct device *dev, enum hwmon_sensor_types type,
|
|
u32 attr, int channel, long val)
|
|
{
|
|
switch (type) {
|
|
case hwmon_fan:
|
|
return max31790_write_fan(dev, attr, channel, val);
|
|
case hwmon_pwm:
|
|
return max31790_write_pwm(dev, attr, channel, val);
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
static umode_t max31790_is_visible(const void *data,
|
|
enum hwmon_sensor_types type,
|
|
u32 attr, int channel)
|
|
{
|
|
switch (type) {
|
|
case hwmon_fan:
|
|
return max31790_fan_is_visible(data, attr, channel);
|
|
case hwmon_pwm:
|
|
return max31790_pwm_is_visible(data, attr, channel);
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static const u32 max31790_fan_config[] = {
|
|
HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_FAULT,
|
|
HWMON_F_INPUT | HWMON_F_FAULT,
|
|
0
|
|
};
|
|
|
|
static const struct hwmon_channel_info max31790_fan = {
|
|
.type = hwmon_fan,
|
|
.config = max31790_fan_config,
|
|
};
|
|
|
|
static const u32 max31790_pwm_config[] = {
|
|
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
|
|
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
|
|
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
|
|
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
|
|
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
|
|
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
|
|
0
|
|
};
|
|
|
|
static const struct hwmon_channel_info max31790_pwm = {
|
|
.type = hwmon_pwm,
|
|
.config = max31790_pwm_config,
|
|
};
|
|
|
|
static const struct hwmon_channel_info *max31790_info[] = {
|
|
&max31790_fan,
|
|
&max31790_pwm,
|
|
NULL
|
|
};
|
|
|
|
static const struct hwmon_ops max31790_hwmon_ops = {
|
|
.is_visible = max31790_is_visible,
|
|
.read = max31790_read,
|
|
.write = max31790_write,
|
|
};
|
|
|
|
static const struct hwmon_chip_info max31790_chip_info = {
|
|
.ops = &max31790_hwmon_ops,
|
|
.info = max31790_info,
|
|
};
|
|
|
|
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_info(dev, client->name,
|
|
data,
|
|
&max31790_chip_info,
|
|
NULL);
|
|
|
|
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");
|