linux-kernel - [PATCH V2 2/2] hwmon: pwm-fan: Add optional regulator support

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Message-Id: <1549557480-14436-3-git-send-email-stefan.wahren@i2se.com>
Date:   Thu,  7 Feb 2019 17:38:00 +0100
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Kamil Debski <kamil@...as.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Stefan Wahren <stefan.wahren@...e.com>
Subject: [PATCH V2 2/2] hwmon: pwm-fan: Add optional regulator support

This adds optional regulator support to the pwm-fan driver. This is
necessary for pwm fans which are powered by a switchable supply.

Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
---
 drivers/hwmon/pwm-fan.c | 39 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 2c94482..344915c 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;
@@ -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)
+			ctx->reg_en = NULL;
+		else
+			return PTR_ERR(ctx->reg_en);
+	} 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 @@ static int pwm_fan_probe(struct platform_device *pdev)
 	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;
 }
 
@@ -299,6 +324,12 @@ static int pwm_fan_suspend(struct device *dev)
 
 	pwm_get_args(ctx->pwm, &args);
 
+	if (ctx->reg_en) {
+		ret = regulator_disable(ctx->reg_en);
+		if (ret)
+			dev_err(dev, "Failed to disable fan supply: %d\n", ret);
+	}
+
 	if (ctx->pwm_value) {
 		ret = pwm_config(ctx->pwm, 0, args.period);
 		if (ret < 0)
@@ -317,6 +348,12 @@ 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);
+	}
+
 	if (ctx->pwm_value == 0)
 		return 0;
 
-- 
2.7.4