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authorLukasz Majewski <l.majewski@samsung.com>2015-02-26 14:59:35 +0100
committerGuenter Roeck <linux@roeck-us.net>2015-03-09 09:59:36 -0700
commitcb85ca332f4d72ca68464c55f63af0387f6bbdb1 (patch)
tree1deaaab9338faebcaf9f920cd8021724ac202485 /drivers/hwmon
parent73ef85f42da2df8b567fea109c67ed53db937bcc (diff)
downloadlinux-cb85ca332f4d72ca68464c55f63af0387f6bbdb1.tar.bz2
hwmon: (pwm-fan) Extract __set_pwm() function to only modify PWM duty cycle
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>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/pwm-fan.c33
1 files changed, 21 insertions, 12 deletions
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 1991d9032c38..bd42d3996a86 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -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)
{