Commit ea33597c authored by Constantine Shulyupin's avatar Constantine Shulyupin Committed by Guenter Roeck
Browse files

hwmon: (nct7802) Add pwm control 



Added fan output control registers.
Modes of operation are PWM (default) and DC.

Introduced show_pwm, store_pwm, nct7802_pwm_attrs, nct7802_pwm_group.

Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent fcdc5739

drivers/hwmon/nct7802.c

+47 −0
Original line number Diff line number Diff line
@@ -102,6 +102,36 @@ static ssize_t store_temp_type(struct device *dev, 
	return err ? : count;

}



static ssize_t show_pwm(struct device *dev, struct device_attribute *devattr,

			char *buf)

{

	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

	struct nct7802_data *data = dev_get_drvdata(dev);

	unsigned int val;

	int ret;



	ret = regmap_read(data->regmap, attr->index, &val);

	if (ret < 0)

		return ret;



	return sprintf(buf, "%d\n", val);

}



static ssize_t store_pwm(struct device *dev, struct device_attribute *devattr,

			 const char *buf, size_t count)

{

	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

	struct nct7802_data *data = dev_get_drvdata(dev);

	int err;

	u8 val;



	err = kstrtou8(buf, 0, &val);

	if (err < 0)

		return err;



	err = regmap_write(data->regmap, attr->index, val);

	return err ? : count;

}



static int nct7802_read_temp(struct nct7802_data *data,

			     u8 reg_temp, u8 reg_temp_low, int *temp)
@@ -735,6 +765,11 @@ static SENSOR_DEVICE_ATTR_2(fan3_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 2); 
static SENSOR_DEVICE_ATTR_2(fan3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,

			    0x5b, 2);



/* 7.2.91... Fan Control Output Value */

static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 0x60);

static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 0x61);

static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 0x62);



static struct attribute *nct7802_fan_attrs[] = {

	&sensor_dev_attr_fan1_input.dev_attr.attr,

	&sensor_dev_attr_fan1_min.dev_attr.attr,
@@ -773,10 +808,22 @@ static struct attribute_group nct7802_fan_group = { 
	.is_visible = nct7802_fan_is_visible,

};



static struct attribute *nct7802_pwm_attrs[] = {

	&sensor_dev_attr_pwm1.dev_attr.attr,

	&sensor_dev_attr_pwm2.dev_attr.attr,

	&sensor_dev_attr_pwm3.dev_attr.attr,

	NULL

};



static struct attribute_group nct7802_pwm_group = {

	.attrs = nct7802_pwm_attrs,

};



static const struct attribute_group *nct7802_groups[] = {

	&nct7802_temp_group,

	&nct7802_in_group,

	&nct7802_fan_group,

	&nct7802_pwm_group,

	NULL

};