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i8k: Implement hwmon based fan speed control 

Fan speed can be set to off, slow, and fast, which can be exported
to userspace through the hwmon ABI as pwm1 / pwm2.

Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guenter Roeck 2013-12-14 09:30:21 -08:00 committed by Greg Kroah-Hartman
parent e551b15250
commit e7f5f275c6
1 changed files with 44 additions and 5 deletions
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49
drivers/char/i8k.c
View File

@ -509,6 +509,39 @@ static ssize_t i8k_hwmon_show_fan(struct device *dev,
return sprintf(buf, "%d\n", fan_speed);
}
static ssize_t i8k_hwmon_show_pwm(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
int status;
status = i8k_get_fan_status(index);
if (status < 0)
return -EIO;
return sprintf(buf, "%d\n", clamp_val(status * 128, 0, 255));
}
static ssize_t i8k_hwmon_set_pwm(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int index = to_sensor_dev_attr(attr)->index;
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
val = clamp_val(DIV_ROUND_CLOSEST(val, 128), 0, 2);
mutex_lock(&i8k_mutex);
err = i8k_set_fan(index, val);
mutex_unlock(&i8k_mutex);
return err < 0 ? -EIO : count;
}
static ssize_t i8k_hwmon_show_label(struct device *dev,
struct device_attribute *devattr,
char *buf)
@ -529,8 +562,12 @@ static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
I8K_FAN_LEFT);
static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
i8k_hwmon_set_pwm, I8K_FAN_LEFT);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
I8K_FAN_RIGHT);
static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
i8k_hwmon_set_pwm, I8K_FAN_RIGHT);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 1);
static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_label, NULL, 2);
@ -542,9 +579,11 @@ static struct attribute *i8k_attrs[] = {
&sensor_dev_attr_temp3_input.dev_attr.attr, /* 3 */
&sensor_dev_attr_temp4_input.dev_attr.attr, /* 4 */
&sensor_dev_attr_fan1_input.dev_attr.attr, /* 5 */
&sensor_dev_attr_fan1_label.dev_attr.attr, /* 6 */
&sensor_dev_attr_fan2_input.dev_attr.attr, /* 7 */
&sensor_dev_attr_fan2_label.dev_attr.attr, /* 8 */
&sensor_dev_attr_pwm1.dev_attr.attr, /* 6 */
&sensor_dev_attr_fan1_label.dev_attr.attr, /* 7 */
&sensor_dev_attr_fan2_input.dev_attr.attr, /* 8 */
&sensor_dev_attr_pwm2.dev_attr.attr, /* 9 */
&sensor_dev_attr_fan2_label.dev_attr.attr, /* 10 */
NULL
};
@ -560,10 +599,10 @@ static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
return 0;
if (index == 4 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
return 0;
if ((index == 5 || index == 6) &&
if (index >= 5 && index <= 7 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
return 0;
if ((index == 7 || index == 8) &&
if (index >= 8 && index <= 10 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
return 0;