linux-kernel - [PATCH] hwmon: (gpio-fan) Add a shutdown handler to poweroff the fans

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Date:	Thu, 4 Dec 2014 10:58:56 -0600
From:	Nishanth Menon <nm@...com>
To:	Guenter Roeck <linux@...ck-us.net>, Jean Delvare <jdelvare@...e.de>
CC:	<linux-kernel@...r.kernel.org>, <lm-sensors@...sensors.org>,
	<linux-omap@...r.kernel.org>, Nishanth Menon <nm@...com>
Subject: [PATCH] hwmon: (gpio-fan) Add a shutdown handler to poweroff the fans

Poweroff the fans when shutting down the system. Else,
echo '1' > /sys/class/hwmon/hwmon0/fan1_target; poweroff leaves the
fan running if the System power off does not drive the gpio expander
which might control the fan power supply.

Signed-off-by: Nishanth Menon <nm@...com>
---
based on next-20141204 , but can rebase to required branch as needed.

 drivers/hwmon/gpio-fan.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index 7802eb2..36abf81 100644
--- a/drivers/hwmon/gpio-fan.c
+++ b/drivers/hwmon/gpio-fan.c
@@ -550,6 +550,14 @@ static int gpio_fan_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static void gpio_fan_shutdown(struct platform_device *pdev)
+{
+	struct gpio_fan_data *fan_data = dev_get_drvdata(&pdev->dev);
+
+	if (fan_data->ctrl)
+		set_fan_speed(fan_data, 0);
+}
+
 #ifdef CONFIG_PM_SLEEP
 static int gpio_fan_suspend(struct device *dev)
 {
@@ -581,6 +589,7 @@ static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume);
 
 static struct platform_driver gpio_fan_driver = {
 	.probe		= gpio_fan_probe,
+	.shutdown	= gpio_fan_shutdown,
 	.driver	= {
 		.name	= "gpio-fan",
 		.pm	= GPIO_FAN_PM,
-- 
1.7.9.5

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