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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: Guenter Roeck <linux@roeck-us.net>
hifive-unleashed-5.1
Constantine Shulyupin 2015-07-04 21:49:51 +03:00 committed by Guenter Roeck
parent fcdc5739dc
commit ea33597c6f
1 changed files with 47 additions and 0 deletions
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47
drivers/hwmon/nct7802.c
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@ -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
};