[PATCH 1/2] hwmon: (pwm-fan) add option to stop fan on shutdown

[Akinobu Mita <akinobu.mita@gmail.com>]

The pwm-fan driver leaves the fun running when shutting down the system.
(On the other hand the gpio-fan driver stops it.)

This adds an optional property "disable-state-shutdown" in case someone
wants to stop the fun running when shutting down the system.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Kamil Debski <kamil@wypas.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
 drivers/hwmon/pwm-fan.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 42ffd2e..8775d37 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -33,6 +33,7 @@ struct pwm_fan_ctx {
 	u8 pulses_per_revolution;
 	ktime_t sample_start;
 	struct timer_list rpm_timer;
+	bool disable_state_shutdown;
 
 	unsigned int pwm_value;
 	unsigned int pwm_fan_state;
@@ -292,6 +293,9 @@ static int pwm_fan_probe(struct platform_device *pdev)
 
 	mutex_init(&ctx->lock);
 
+	ctx->disable_state_shutdown =
+		of_property_read_bool(dev->of_node, "disable-state-shutdown");
+
 	ctx->pwm = devm_of_pwm_get(dev, dev->of_node, NULL);
 	if (IS_ERR(ctx->pwm)) {
 		ret = PTR_ERR(ctx->pwm);
@@ -390,8 +394,7 @@ static int pwm_fan_probe(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int pwm_fan_suspend(struct device *dev)
+static int pwm_fan_disable(struct device *dev)
 {
 	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
 	struct pwm_args args;
@@ -418,6 +421,22 @@ static int pwm_fan_suspend(struct device *dev)
 	return 0;
 }
 
+static void pwm_fan_shutdown(struct platform_device *pdev)
+{
+	struct pwm_fan_ctx *ctx = platform_get_drvdata(pdev);
+
+	if (!ctx->disable_state_shutdown)
+		return;
+
+	pwm_fan_disable(&pdev->dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pwm_fan_suspend(struct device *dev)
+{
+	return pwm_fan_disable(dev);
+}
+
 static int pwm_fan_resume(struct device *dev)
 {
 	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
@@ -455,6 +474,7 @@ MODULE_DEVICE_TABLE(of, of_pwm_fan_match);
 
 static struct platform_driver pwm_fan_driver = {
 	.probe		= pwm_fan_probe,
+	.shutdown	= pwm_fan_shutdown,
 	.driver	= {
 		.name		= "pwm-fan",
 		.pm		= &pwm_fan_pm,
-- 
2.7.4