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hwmon: (adt7475) add high frequency support 

Systems using 4-wire fans usually require high frequency (22.5kHz)
output on the pwm. Add 22500 as a valid option in the pwmfreq_table. In
high frequency mode the low-order bit are ignored so they can safely be
set to 0.

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 13:30:29 +12:00 committed by Guenter Roeck
parent 1d58f5efbf
commit 3490c92a09
1 changed files with 5 additions and 4 deletions
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9
drivers/hwmon/adt7475.c
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@ -852,7 +852,7 @@ static ssize_t set_pwmctrl(struct device *dev, struct device_attribute *attr,
/* List of frequencies for the PWM */
static const int pwmfreq_table[] = {
11, 14, 22, 29, 35, 44, 58, 88
11, 14, 22, 29, 35, 44, 58, 88, 22500
};
static ssize_t show_pwmfreq(struct device *dev, struct device_attribute *attr,
@ -860,9 +860,10 @@ static ssize_t show_pwmfreq(struct device *dev, struct device_attribute *attr,
{
struct adt7475_data *data = adt7475_update_device(dev);
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
int i = clamp_val(data->range[sattr->index] & 0xf, 0,
ARRAY_SIZE(pwmfreq_table) - 1);
return sprintf(buf, "%d\n",
pwmfreq_table[data->range[sattr->index] & 7]);
return sprintf(buf, "%d\n", pwmfreq_table[i]);
}
static ssize_t set_pwmfreq(struct device *dev, struct device_attribute *attr,
@ -883,7 +884,7 @@ static ssize_t set_pwmfreq(struct device *dev, struct device_attribute *attr,
data->range[sattr->index] =
adt7475_read(TEMP_TRANGE_REG(sattr->index));
data->range[sattr->index] &= ~7;
data->range[sattr->index] &= ~0xf;
data->range[sattr->index] |= out;
i2c_smbus_write_byte_data(client, TEMP_TRANGE_REG(sattr->index),