515 lines
14 KiB
C
515 lines
14 KiB
C
/*
|
|
* tc654.c - Linux kernel modules for fan speed controller
|
|
*
|
|
* Copyright (C) 2016 Allied Telesis Labs NZ
|
|
*
|
|
* 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/bitops.h>
|
|
#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/mutex.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/util_macros.h>
|
|
|
|
enum tc654_regs {
|
|
TC654_REG_RPM1 = 0x00, /* RPM Output 1 */
|
|
TC654_REG_RPM2 = 0x01, /* RPM Output 2 */
|
|
TC654_REG_FAN_FAULT1 = 0x02, /* Fan Fault 1 Threshold */
|
|
TC654_REG_FAN_FAULT2 = 0x03, /* Fan Fault 2 Threshold */
|
|
TC654_REG_CONFIG = 0x04, /* Configuration */
|
|
TC654_REG_STATUS = 0x05, /* Status */
|
|
TC654_REG_DUTY_CYCLE = 0x06, /* Fan Speed Duty Cycle */
|
|
TC654_REG_MFR_ID = 0x07, /* Manufacturer Identification */
|
|
TC654_REG_VER_ID = 0x08, /* Version Identification */
|
|
};
|
|
|
|
/* Macros to easily index the registers */
|
|
#define TC654_REG_RPM(idx) (TC654_REG_RPM1 + (idx))
|
|
#define TC654_REG_FAN_FAULT(idx) (TC654_REG_FAN_FAULT1 + (idx))
|
|
|
|
/* Config register bits */
|
|
#define TC654_REG_CONFIG_RES BIT(6) /* Resolution Selection */
|
|
#define TC654_REG_CONFIG_DUTYC BIT(5) /* Duty Cycle Control */
|
|
#define TC654_REG_CONFIG_SDM BIT(0) /* Shutdown Mode */
|
|
|
|
/* Status register bits */
|
|
#define TC654_REG_STATUS_F2F BIT(1) /* Fan 2 Fault */
|
|
#define TC654_REG_STATUS_F1F BIT(0) /* Fan 1 Fault */
|
|
|
|
/* RPM resolution for RPM Output registers */
|
|
#define TC654_HIGH_RPM_RESOLUTION 25 /* 25 RPM resolution */
|
|
#define TC654_LOW_RPM_RESOLUTION 50 /* 50 RPM resolution */
|
|
|
|
/* Convert to the fan fault RPM threshold from register value */
|
|
#define TC654_FAN_FAULT_FROM_REG(val) ((val) * 50) /* 50 RPM resolution */
|
|
|
|
/* Convert to register value from the fan fault RPM threshold */
|
|
#define TC654_FAN_FAULT_TO_REG(val) (((val) / 50) & 0xff)
|
|
|
|
/* Register data is read (and cached) at most once per second. */
|
|
#define TC654_UPDATE_INTERVAL HZ
|
|
|
|
struct tc654_data {
|
|
struct i2c_client *client;
|
|
|
|
/* update mutex */
|
|
struct mutex update_lock;
|
|
|
|
/* tc654 register cache */
|
|
bool valid;
|
|
unsigned long last_updated; /* in jiffies */
|
|
|
|
u8 rpm_output[2]; /* The fan RPM data for fans 1 and 2 is then
|
|
* written to registers RPM1 and RPM2
|
|
*/
|
|
u8 fan_fault[2]; /* The Fan Fault Threshold Registers are used to
|
|
* set the fan fault threshold levels for fan 1
|
|
* and fan 2
|
|
*/
|
|
u8 config; /* The Configuration Register is an 8-bit read/
|
|
* writable multi-function control register
|
|
* 7: Fan Fault Clear
|
|
* 1 = Clear Fan Fault
|
|
* 0 = Normal Operation (default)
|
|
* 6: Resolution Selection for RPM Output Registers
|
|
* RPM Output Registers (RPM1 and RPM2) will be
|
|
* set for
|
|
* 1 = 25 RPM (9-bit) resolution
|
|
* 0 = 50 RPM (8-bit) resolution (default)
|
|
* 5: Duty Cycle Control Method
|
|
* The V OUT duty cycle will be controlled via
|
|
* 1 = the SMBus interface.
|
|
* 0 = via the V IN analog input pin. (default)
|
|
* 4,3: Fan 2 Pulses Per Rotation
|
|
* 00 = 1
|
|
* 01 = 2 (default)
|
|
* 10 = 4
|
|
* 11 = 8
|
|
* 2,1: Fan 1 Pulses Per Rotation
|
|
* 00 = 1
|
|
* 01 = 2 (default)
|
|
* 10 = 4
|
|
* 11 = 8
|
|
* 0: Shutdown Mode
|
|
* 1 = Shutdown mode.
|
|
* 0 = Normal operation. (default)
|
|
*/
|
|
u8 status; /* The Status register provides all the information
|
|
* about what is going on within the TC654/TC655
|
|
* devices.
|
|
* 7,6: Unimplemented, Read as '0'
|
|
* 5: Over-Temperature Fault Condition
|
|
* 1 = Over-Temperature condition has occurred
|
|
* 0 = Normal operation. V IN is less than 2.6V
|
|
* 4: RPM2 Counter Overflow
|
|
* 1 = Fault condition
|
|
* 0 = Normal operation
|
|
* 3: RPM1 Counter Overflow
|
|
* 1 = Fault condition
|
|
* 0 = Normal operation
|
|
* 2: V IN Input Status
|
|
* 1 = V IN is open
|
|
* 0 = Normal operation. voltage present at V IN
|
|
* 1: Fan 2 Fault
|
|
* 1 = Fault condition
|
|
* 0 = Normal operation
|
|
* 0: Fan 1 Fault
|
|
* 1 = Fault condition
|
|
* 0 = Normal operation
|
|
*/
|
|
u8 duty_cycle; /* The DUTY_CYCLE register is a 4-bit read/
|
|
* writable register used to control the duty
|
|
* cycle of the V OUT output.
|
|
*/
|
|
};
|
|
|
|
/* helper to grab and cache data, at most one time per second */
|
|
static struct tc654_data *tc654_update_client(struct device *dev)
|
|
{
|
|
struct tc654_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
if (time_before(jiffies, data->last_updated + TC654_UPDATE_INTERVAL) &&
|
|
likely(data->valid))
|
|
goto out;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, TC654_REG_RPM(0));
|
|
if (ret < 0)
|
|
goto out;
|
|
data->rpm_output[0] = ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, TC654_REG_RPM(1));
|
|
if (ret < 0)
|
|
goto out;
|
|
data->rpm_output[1] = ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, TC654_REG_FAN_FAULT(0));
|
|
if (ret < 0)
|
|
goto out;
|
|
data->fan_fault[0] = ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, TC654_REG_FAN_FAULT(1));
|
|
if (ret < 0)
|
|
goto out;
|
|
data->fan_fault[1] = ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, TC654_REG_CONFIG);
|
|
if (ret < 0)
|
|
goto out;
|
|
data->config = ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, TC654_REG_STATUS);
|
|
if (ret < 0)
|
|
goto out;
|
|
data->status = ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, TC654_REG_DUTY_CYCLE);
|
|
if (ret < 0)
|
|
goto out;
|
|
data->duty_cycle = ret & 0x0f;
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = true;
|
|
out:
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
if (ret < 0) /* upon error, encode it in return value */
|
|
data = ERR_PTR(ret);
|
|
|
|
return data;
|
|
}
|
|
|
|
/*
|
|
* sysfs attributes
|
|
*/
|
|
|
|
static ssize_t show_fan(struct device *dev, struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
int nr = to_sensor_dev_attr(da)->index;
|
|
struct tc654_data *data = tc654_update_client(dev);
|
|
int val;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
if (data->config & TC654_REG_CONFIG_RES)
|
|
val = data->rpm_output[nr] * TC654_HIGH_RPM_RESOLUTION;
|
|
else
|
|
val = data->rpm_output[nr] * TC654_LOW_RPM_RESOLUTION;
|
|
|
|
return sprintf(buf, "%d\n", val);
|
|
}
|
|
|
|
static ssize_t show_fan_min(struct device *dev, struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
int nr = to_sensor_dev_attr(da)->index;
|
|
struct tc654_data *data = tc654_update_client(dev);
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
return sprintf(buf, "%d\n",
|
|
TC654_FAN_FAULT_FROM_REG(data->fan_fault[nr]));
|
|
}
|
|
|
|
static ssize_t set_fan_min(struct device *dev, struct device_attribute *da,
|
|
const char *buf, size_t count)
|
|
{
|
|
int nr = to_sensor_dev_attr(da)->index;
|
|
struct tc654_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
|
|
val = clamp_val(val, 0, 12750);
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
data->fan_fault[nr] = TC654_FAN_FAULT_TO_REG(val);
|
|
ret = i2c_smbus_write_byte_data(client, TC654_REG_FAN_FAULT(nr),
|
|
data->fan_fault[nr]);
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
return ret < 0 ? ret : count;
|
|
}
|
|
|
|
static ssize_t show_fan_alarm(struct device *dev, struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
int nr = to_sensor_dev_attr(da)->index;
|
|
struct tc654_data *data = tc654_update_client(dev);
|
|
int val;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
if (nr == 0)
|
|
val = !!(data->status & TC654_REG_STATUS_F1F);
|
|
else
|
|
val = !!(data->status & TC654_REG_STATUS_F2F);
|
|
|
|
return sprintf(buf, "%d\n", val);
|
|
}
|
|
|
|
static const u8 TC654_FAN_PULSE_SHIFT[] = { 1, 3 };
|
|
|
|
static ssize_t show_fan_pulses(struct device *dev, struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
int nr = to_sensor_dev_attr(da)->index;
|
|
struct tc654_data *data = tc654_update_client(dev);
|
|
u8 val;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
val = BIT((data->config >> TC654_FAN_PULSE_SHIFT[nr]) & 0x03);
|
|
return sprintf(buf, "%d\n", val);
|
|
}
|
|
|
|
static ssize_t set_fan_pulses(struct device *dev, struct device_attribute *da,
|
|
const char *buf, size_t count)
|
|
{
|
|
int nr = to_sensor_dev_attr(da)->index;
|
|
struct tc654_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
u8 config;
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
|
|
switch (val) {
|
|
case 1:
|
|
config = 0;
|
|
break;
|
|
case 2:
|
|
config = 1;
|
|
break;
|
|
case 4:
|
|
config = 2;
|
|
break;
|
|
case 8:
|
|
config = 3;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
data->config &= ~(0x03 << TC654_FAN_PULSE_SHIFT[nr]);
|
|
data->config |= (config << TC654_FAN_PULSE_SHIFT[nr]);
|
|
ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config);
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
return ret < 0 ? ret : count;
|
|
}
|
|
|
|
static ssize_t show_pwm_mode(struct device *dev,
|
|
struct device_attribute *da, char *buf)
|
|
{
|
|
struct tc654_data *data = tc654_update_client(dev);
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
return sprintf(buf, "%d\n", !!(data->config & TC654_REG_CONFIG_DUTYC));
|
|
}
|
|
|
|
static ssize_t set_pwm_mode(struct device *dev,
|
|
struct device_attribute *da,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct tc654_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
|
|
if (val != 0 && val != 1)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (val)
|
|
data->config |= TC654_REG_CONFIG_DUTYC;
|
|
else
|
|
data->config &= ~TC654_REG_CONFIG_DUTYC;
|
|
|
|
ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config);
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
return ret < 0 ? ret : count;
|
|
}
|
|
|
|
static const int tc654_pwm_map[16] = { 77, 88, 102, 112, 124, 136, 148, 160,
|
|
172, 184, 196, 207, 219, 231, 243, 255};
|
|
|
|
static ssize_t show_pwm(struct device *dev, struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
struct tc654_data *data = tc654_update_client(dev);
|
|
int pwm;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
if (data->config & TC654_REG_CONFIG_SDM)
|
|
pwm = 0;
|
|
else
|
|
pwm = tc654_pwm_map[data->duty_cycle];
|
|
|
|
return sprintf(buf, "%d\n", pwm);
|
|
}
|
|
|
|
static ssize_t set_pwm(struct device *dev, struct device_attribute *da,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct tc654_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
if (val > 255)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (val == 0)
|
|
data->config |= TC654_REG_CONFIG_SDM;
|
|
else
|
|
data->config &= ~TC654_REG_CONFIG_SDM;
|
|
|
|
data->duty_cycle = find_closest(val, tc654_pwm_map,
|
|
ARRAY_SIZE(tc654_pwm_map));
|
|
|
|
ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = i2c_smbus_write_byte_data(client, TC654_REG_DUTY_CYCLE,
|
|
data->duty_cycle);
|
|
|
|
out:
|
|
mutex_unlock(&data->update_lock);
|
|
return ret < 0 ? ret : count;
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
|
|
static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
|
|
set_fan_min, 0);
|
|
static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
|
|
set_fan_min, 1);
|
|
static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_fan_alarm, NULL, 1);
|
|
static SENSOR_DEVICE_ATTR(fan1_pulses, S_IWUSR | S_IRUGO, show_fan_pulses,
|
|
set_fan_pulses, 0);
|
|
static SENSOR_DEVICE_ATTR(fan2_pulses, S_IWUSR | S_IRUGO, show_fan_pulses,
|
|
set_fan_pulses, 1);
|
|
static SENSOR_DEVICE_ATTR(pwm1_mode, S_IWUSR | S_IRUGO,
|
|
show_pwm_mode, set_pwm_mode, 0);
|
|
static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm,
|
|
set_pwm, 0);
|
|
|
|
/* Driver data */
|
|
static struct attribute *tc654_attrs[] = {
|
|
&sensor_dev_attr_fan1_input.dev_attr.attr,
|
|
&sensor_dev_attr_fan2_input.dev_attr.attr,
|
|
&sensor_dev_attr_fan1_min.dev_attr.attr,
|
|
&sensor_dev_attr_fan2_min.dev_attr.attr,
|
|
&sensor_dev_attr_fan1_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_fan2_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_fan1_pulses.dev_attr.attr,
|
|
&sensor_dev_attr_fan2_pulses.dev_attr.attr,
|
|
&sensor_dev_attr_pwm1_mode.dev_attr.attr,
|
|
&sensor_dev_attr_pwm1.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
ATTRIBUTE_GROUPS(tc654);
|
|
|
|
/*
|
|
* device probe and removal
|
|
*/
|
|
|
|
static int tc654_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct tc654_data *data;
|
|
struct device *hwmon_dev;
|
|
int ret;
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -ENODEV;
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct tc654_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->client = client;
|
|
mutex_init(&data->update_lock);
|
|
|
|
ret = i2c_smbus_read_byte_data(client, TC654_REG_CONFIG);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
data->config = ret;
|
|
|
|
hwmon_dev =
|
|
devm_hwmon_device_register_with_groups(dev, client->name, data,
|
|
tc654_groups);
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
}
|
|
|
|
static const struct i2c_device_id tc654_id[] = {
|
|
{"tc654", 0},
|
|
{"tc655", 0},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, tc654_id);
|
|
|
|
static struct i2c_driver tc654_driver = {
|
|
.driver = {
|
|
.name = "tc654",
|
|
},
|
|
.probe = tc654_probe,
|
|
.id_table = tc654_id,
|
|
};
|
|
|
|
module_i2c_driver(tc654_driver);
|
|
|
|
MODULE_AUTHOR("Allied Telesis Labs");
|
|
MODULE_DESCRIPTION("Microchip TC654/TC655 driver");
|
|
MODULE_LICENSE("GPL");
|