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hwmon: pwm-fan: add sys attribute to control active cooling

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update fan_speed sys attribute to update the cooling level
for pwm-fan.

Change-Id: I67b0d047dbe0cb0cfa81896ec6226e8e6d79fd1e
This commit is contained in:
Anand Moon
2017-04-13 11:44:58 +05:30
parent f602b09e52
commit c2e92581da
1 changed files with 44 additions and 0 deletions
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44
drivers/hwmon/pwm-fan.c
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@@ -107,11 +107,55 @@ static ssize_t show_pwm(struct device *dev,
return sprintf(buf, "%u\n", ctx->pwm_value);
}
static ssize_t set_cooll(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
unsigned int speed_0, speed_1, speed_2, speed_3;
if(sscanf(buf, "%u %u %u %u\n", &speed_0, &speed_1, &speed_2, &speed_3) != 4) {
dev_err(dev, "invalid speed input");
return -EINVAL;
}
if(!(speed_0 < speed_1 && speed_1 < speed_2 && speed_2 < speed_3)){
dev_err(dev, "fan speeds must be increasing in value");
return count;
}
dev_info(dev, "fan_speeds : %s [%d %d %d %d] \n",
__func__, speed_0, speed_1, speed_2, speed_3);
mutex_lock(&ctx->lock);
ctx->pwm_fan_cooling_levels[0] = speed_0;
ctx->pwm_fan_cooling_levels[1] = speed_1;
ctx->pwm_fan_cooling_levels[2] = speed_2;
ctx->pwm_fan_cooling_levels[3] = speed_3;
mutex_unlock(&ctx->lock);
return count;
}
static ssize_t show_cooll(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
int lenght = 0, i;
mutex_lock(&ctx->lock);
for (i = 0; i <= ctx->pwm_fan_max_state; i++)
lenght += sprintf(buf+lenght, "%u ", ctx->pwm_fan_cooling_levels[i]);
mutex_unlock(&ctx->lock);
return lenght;
}
static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 0);
static SENSOR_DEVICE_ATTR(fan_speed, S_IRUGO | S_IWUSR, show_cooll, set_cooll, 0);
static struct attribute *pwm_fan_attrs[] = {
&sensor_dev_attr_pwm1.dev_attr.attr,
&sensor_dev_attr_fan_speed.dev_attr.attr,
NULL,
};