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hwmon: (pwm-fan) Extract __set_pwm() function to only modify PWM duty cycle

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It was necessary to decouple code handling writing to sysfs from the one
responsible for setting PWM of the fan.
Due to that, new __set_pwm() method was extracted, which is responsible for
only setting new PWM duty cycle.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Lukasz Majewski 2015-02-26 14:59:35 +01:00 committed by Guenter Roeck
parent 73ef85f42d
commit cb85ca332f
1 changed files with 21 additions and 12 deletions
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33
drivers/hwmon/pwm-fan.c
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@ -33,20 +33,14 @@ struct pwm_fan_ctx {
unsigned char pwm_value;
};
static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
{
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
unsigned long pwm, duty;
ssize_t ret;
if (kstrtoul(buf, 10, &pwm) || pwm > MAX_PWM)
return -EINVAL;
unsigned long duty;
int ret = 0;
mutex_lock(&ctx->lock);
if (ctx->pwm_value == pwm)
goto exit_set_pwm_no_change;
goto exit_set_pwm_err;
if (pwm == 0) {
pwm_disable(ctx->pwm);
@ -66,13 +60,28 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
exit_set_pwm:
ctx->pwm_value = pwm;
exit_set_pwm_no_change:
ret = count;
exit_set_pwm_err:
mutex_unlock(&ctx->lock);
return ret;
}
static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
unsigned long pwm;
int ret;
if (kstrtoul(buf, 10, &pwm) || pwm > MAX_PWM)
return -EINVAL;
ret = __set_pwm(ctx, pwm);
if (ret)
return ret;
return count;
}
static ssize_t show_pwm(struct device *dev,
struct device_attribute *attr, char *buf)
{