1 files changed, 47 insertions, 6 deletions

diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 7da6a160d45a..167221c7628a 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -23,6 +23,7 @@
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
+#include <linux/regulator/consumer.h>
 #include <linux/sysfs.h>
 #include <linux/thermal.h>
 
@@ -31,6 +32,7 @@
 struct pwm_fan_ctx {
 	struct mutex lock;
 	struct pwm_device *pwm;
+	struct regulator *reg_en;
 	unsigned int pwm_value;
 	unsigned int pwm_fan_state;
 	unsigned int pwm_fan_max_state;
@@ -72,8 +74,8 @@ static void pwm_fan_update_state(struct pwm_fan_ctx *ctx, unsigned long pwm)
 	ctx->pwm_fan_state = i;
 }
 
-static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
-		       const char *buf, size_t count)
+static ssize_t pwm_store(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;
@@ -90,8 +92,8 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
 	return count;
 }
 
-static ssize_t show_pwm(struct device *dev,
-			struct device_attribute *attr, char *buf)
+static ssize_t pwm_show(struct device *dev, struct device_attribute *attr,
+			char *buf)
 {
 	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
 
@@ -99,7 +101,7 @@ static ssize_t show_pwm(struct device *dev,
 }
 
 
-static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 0);
+static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
 
 static struct attribute *pwm_fan_attrs[] = {
 	&sensor_dev_attr_pwm1.dev_attr.attr,
@@ -231,6 +233,21 @@ static int pwm_fan_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, ctx);
 
+	ctx->reg_en = devm_regulator_get_optional(&pdev->dev, "fan");
+	if (IS_ERR(ctx->reg_en)) {
+		if (PTR_ERR(ctx->reg_en) != -ENODEV)
+			return PTR_ERR(ctx->reg_en);
+
+		ctx->reg_en = NULL;
+	} else {
+		ret = regulator_enable(ctx->reg_en);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Failed to enable fan supply: %d\n", ret);
+			return ret;
+		}
+	}
+
 	ctx->pwm_value = MAX_PWM;
 
 	/* Set duty cycle to maximum allowed and enable PWM output */
@@ -241,7 +258,7 @@ static int pwm_fan_probe(struct platform_device *pdev)
 	ret = pwm_apply_state(ctx->pwm, &state);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to configure PWM\n");
-		return ret;
+		goto err_reg_disable;
 	}
 
 	hwmon = devm_hwmon_device_register_with_groups(&pdev->dev, "pwmfan",
@@ -277,6 +294,10 @@ err_pwm_disable:
 	state.enabled = false;
 	pwm_apply_state(ctx->pwm, &state);
 
+err_reg_disable:
+	if (ctx->reg_en)
+		regulator_disable(ctx->reg_en);
+
 	return ret;
 }
 
@@ -287,6 +308,10 @@ static int pwm_fan_remove(struct platform_device *pdev)
 	thermal_cooling_device_unregister(ctx->cdev);
 	if (ctx->pwm_value)
 		pwm_disable(ctx->pwm);
+
+	if (ctx->reg_en)
+		regulator_disable(ctx->reg_en);
+
 	return 0;
 }
 
@@ -307,6 +332,14 @@ static int pwm_fan_suspend(struct device *dev)
 		pwm_disable(ctx->pwm);
 	}
 
+	if (ctx->reg_en) {
+		ret = regulator_disable(ctx->reg_en);
+		if (ret) {
+			dev_err(dev, "Failed to disable fan supply: %d\n", ret);
+			return ret;
+		}
+	}
+
 	return 0;
 }
 
@@ -317,6 +350,14 @@ static int pwm_fan_resume(struct device *dev)
 	unsigned long duty;
 	int ret;
 
+	if (ctx->reg_en) {
+		ret = regulator_enable(ctx->reg_en);
+		if (ret) {
+			dev_err(dev, "Failed to enable fan supply: %d\n", ret);
+			return ret;
+		}
+	}
+
 	if (ctx->pwm_value == 0)
 		return 0;