Make starting fan temperature as sysfs node

Fan starting more smoothly
hardkernel · Apr 22, 2014 · be290d7 · be290d7
1 parent eadf710
commit be290d7
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Showing 3 changed files with 42 additions and 3 deletions.
diff --git a/arch/arm/mach-exynos/mach-hkdk4412.c b/arch/arm/mach-exynos/mach-hkdk4412.c
@@ -473,7 +473,8 @@ struct odroid_fan_platform_data odroid_fan_pdata = {
 
         .pwm_id = 0,
         .pwm_periode_ns = 20972,        // Freq 22KHz,
-        .pwm_duty = 255,                                // max=255, 
+        .pwm_duty = 255,                // max=255,
+        .pwm_start_temp = 50,           // default 50,
 };
 
 static struct platform_device odroid_fan = {

diff --git a/drivers/hardkernel/odroidu2_fan.c b/drivers/hardkernel/odroidu2_fan.c
@@ -46,6 +46,7 @@ struct odroid_fan {
 
 	int period;
 	int duty;
+	int start_temp;
 	int pwm_id;
 };
 
@@ -62,6 +63,10 @@ static	ssize_t set_pwm_duty	(struct device *dev, struct device_attribute *attr,
 static	ssize_t show_pwm_duty	(struct device *dev, struct device_attribute *attr, char *buf);
 static	DEVICE_ATTR(pwm_duty, S_IRWXUGO, show_pwm_duty, set_pwm_duty);
 
+static	ssize_t set_start_temp	(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
+static	ssize_t show_start_temp	(struct device *dev, struct device_attribute *attr, char *buf);
+static	DEVICE_ATTR(start_temp, S_IRWXUGO, show_start_temp, set_start_temp);
+
 static	ssize_t set_fan_mode	(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
 static	ssize_t show_fan_mode	(struct device *dev, struct device_attribute *attr, char *buf);
 static	DEVICE_ATTR(fan_mode, S_IRWXUGO, show_fan_mode, set_fan_mode);
@@ -70,6 +75,7 @@ static	DEVICE_ATTR(fan_mode, S_IRWXUGO, show_fan_mode, set_fan_mode);
 static struct attribute *odroid_fan_sysfs_entries[] = {
 	&dev_attr_pwm_enable.attr,
 	&dev_attr_pwm_duty.attr,
+	&dev_attr_start_temp.attr,
 	&dev_attr_fan_mode.attr,
 	NULL
 };
@@ -202,6 +208,34 @@ static	ssize_t show_pwm_duty	(struct device *dev, struct device_attribute *attr,
 }
 
 
+//[*]------------------------------------------------------------------------------------------------------------------
+//[*]------------------------------------------------------------------------------------------------------------------
+static	ssize_t set_start_temp	(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct odroid_fan *fan = dev_get_drvdata(dev);
+	unsigned int	val;
+
+	if(!(sscanf(buf, "%u\n", &val)))
+		return	-EINVAL;
+
+	if((val >= FAN_TEMP_THROTTLE)||(val < 0)){
+		printk("PWM_0 : Invalid param. Start fan temperature range is 0 to %u \n", FAN_TEMP_THROTTLE - 1);
+		return count;
+	}
+
+	if(val == 0) val = 1;
+	fan->start_temp = val;
+	return count;
+}
+
+static	ssize_t show_start_temp	(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct odroid_fan *fan = dev_get_drvdata(dev);
+
+	return	sprintf(buf, "PWM_0 : Fan starting temperature -> %d \n", fan->start_temp);
+}
+
+
 //[*]--------------------------------------------------------------------------------------------------[*]
 //[*]--------------------------------------------------------------------------------------------------[*]
 static int	odroid_fan_resume(struct platform_device *dev)
@@ -233,7 +267,7 @@ void odroid_work(struct work_struct *work)
 
 	mutex_lock(&fan->mutex);
 
-	if(temperature < 50) {
+	if(temperature < fan->start_temp) {
 		pwm_disable(fan->pwm);
 		pwm_config(fan->pwm, 1, fan->period);
 		pwm_enable(fan->pwm);
@@ -245,7 +279,7 @@ void odroid_work(struct work_struct *work)
 	/* 83C is the first throttle.. 
 	 * Lets not reach it
 	 */
-	fan->duty = 255 * temperature / 80; 
+	fan->duty = 255 * (temperature - fan->start_temp) / (FAN_TEMP_THROTTLE - fan->start_temp);
 
 
 	if(fan->pwm_status) {
@@ -286,6 +320,7 @@ static	int		odroid_fan_probe		(struct platform_device *pdev)
 
 		fan->period = fan->pdata->pwm_periode_ns;
 		fan->duty = fan->pdata->pwm_duty;
+		fan->start_temp = fan->pdata->pwm_start_temp;
 		pwm_config(fan->pwm, fan->duty * fan->period / 255, fan->period);
 		pwm_enable(fan->pwm);
 

diff --git a/include/linux/platform_data/odroidu2_fan.h b/include/linux/platform_data/odroidu2_fan.h
@@ -13,13 +13,16 @@
 #define ISA1200_PWM_GEN_MODE		(2<<3)
 #define ISA1200_WAVE_GEN_MODE		(3<<3)
 
+#define FAN_TEMP_THROTTLE 80
+
 struct odroid_fan_platform_data {
 	int pwm_gpio;
 	int pwm_func;
 
 	int pwm_id;
 	unsigned short pwm_periode_ns;
 	unsigned short pwm_duty;
+	unsigned short pwm_start_temp;
 };
 
 #endif /* __LINUX_ODROID_FAN_H */