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@ti.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index 7802eb2a442f..36abf814b8c7 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,