Commit 3490c92a authored by Chris Packham's avatar Chris Packham Committed by Guenter Roeck
Browse files

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: default avatarChris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 1d58f5ef

drivers/hwmon/adt7475.c

+5 −4
Original line number Diff line number Diff line
@@ -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),