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.majew...@samsung.com>
---
drivers/hwmon/pwm-fan.c | 35 ++++++++++++++++++++++-------------
1 file changed, 22 insertions(+), 13 deletions(-)
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 1991d903..870e100 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -33,21 +33,15 @@ 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;
-
- mutex_lock(&ctx->lock);
+ unsigned long duty;
+ int ret;
if (ctx->pwm_value == pwm)
- goto exit_set_pwm_no_change;
+ return 0;
+ mutex_lock(&ctx->lock);
if (pwm == 0) {
pwm_disable(ctx->pwm);
goto exit_set_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)
{
--
2.0.0.rc2
--
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