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hwmon: (adt7475) temperature smoothing

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When enabled temperature smoothing allows ramping the fan speed over a
configurable period of time instead of jumping to the new speed
instantaneously.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Chris Packham
2017-05-15 13:30:28 +12:00
committed by Guenter Roeck
parent 3490c92a09
commit 8f05bcc33e
2 changed files with 95 additions and 0 deletions
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91
drivers/hwmon/adt7475.c
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@@ -526,6 +526,88 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *attr,
return count;
}
/* Assuming CONFIG6[SLOW] is 0 */
static const int ad7475_st_map[] = {
37500, 18800, 12500, 7500, 4700, 3100, 1600, 800,
};
static ssize_t show_temp_st(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7475_data *data = i2c_get_clientdata(client);
long val;
switch (sattr->index) {
case 0:
val = data->enh_acoustics[0] & 0xf;
break;
case 1:
val = (data->enh_acoustics[1] >> 4) & 0xf;
break;
case 2:
default:
val = data->enh_acoustics[1] & 0xf;
break;
}
if (val & 0x8)
return sprintf(buf, "%d\n", ad7475_st_map[val & 0x7]);
else
return sprintf(buf, "0\n");
}
static ssize_t set_temp_st(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7475_data *data = i2c_get_clientdata(client);
unsigned char reg;
int shift, idx;
ulong val;
if (kstrtoul(buf, 10, &val))
return -EINVAL;
switch (sattr->index) {
case 0:
reg = REG_ENHANCE_ACOUSTICS1;
shift = 0;
idx = 0;
break;
case 1:
reg = REG_ENHANCE_ACOUSTICS2;
shift = 0;
idx = 1;
break;
case 2:
default:
reg = REG_ENHANCE_ACOUSTICS2;
shift = 4;
idx = 1;
break;
}
if (val > 0) {
val = find_closest_descending(val, ad7475_st_map,
ARRAY_SIZE(ad7475_st_map));
val |= 0x8;
}
mutex_lock(&data->lock);
data->enh_acoustics[idx] &= ~(0xf << shift);
data->enh_acoustics[idx] |= (val << shift);
i2c_smbus_write_byte_data(client, reg, data->enh_acoustics[idx]);
mutex_unlock(&data->lock);
return count;
}
/*
* Table of autorange values - the user will write the value in millidegrees,
* and we'll convert it
@@ -1009,6 +1091,8 @@ static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
THERM, 0);
static SENSOR_DEVICE_ATTR_2(temp1_crit_hyst, S_IRUGO | S_IWUSR, show_temp,
set_temp, HYSTERSIS, 0);
static SENSOR_DEVICE_ATTR_2(temp1_smoothing, S_IRUGO | S_IWUSR, show_temp_st,
set_temp_st, 0, 0);
static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, INPUT, 1);
static SENSOR_DEVICE_ATTR_2(temp2_alarm, S_IRUGO, show_temp, NULL, ALARM, 1);
static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
@@ -1025,6 +1109,8 @@ static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
THERM, 1);
static SENSOR_DEVICE_ATTR_2(temp2_crit_hyst, S_IRUGO | S_IWUSR, show_temp,
set_temp, HYSTERSIS, 1);
static SENSOR_DEVICE_ATTR_2(temp2_smoothing, S_IRUGO | S_IWUSR, show_temp_st,
set_temp_st, 0, 1);
static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, INPUT, 2);
static SENSOR_DEVICE_ATTR_2(temp3_alarm, S_IRUGO, show_temp, NULL, ALARM, 2);
static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_temp, NULL, FAULT, 2);
@@ -1042,6 +1128,8 @@ static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
THERM, 2);
static SENSOR_DEVICE_ATTR_2(temp3_crit_hyst, S_IRUGO | S_IWUSR, show_temp,
set_temp, HYSTERSIS, 2);
static SENSOR_DEVICE_ATTR_2(temp3_smoothing, S_IRUGO | S_IWUSR, show_temp_st,
set_temp_st, 0, 2);
static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_tach, NULL, INPUT, 0);
static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_tach, set_tach,
MIN, 0);
@@ -1126,6 +1214,7 @@ static struct attribute *adt7475_attrs[] = {
&sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_smoothing.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
@@ -1135,6 +1224,7 @@ static struct attribute *adt7475_attrs[] = {
&sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp2_smoothing.dev_attr.attr,
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&sensor_dev_attr_temp3_alarm.dev_attr.attr,
@@ -1145,6 +1235,7 @@ static struct attribute *adt7475_attrs[] = {
&sensor_dev_attr_temp3_auto_point2_temp.dev_attr.attr,
&sensor_dev_attr_temp3_crit.dev_attr.attr,
&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp3_smoothing.dev_attr.attr,
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan1_min.dev_attr.attr,
&sensor_dev_attr_fan1_alarm.dev_attr.attr,