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authorEddie James <eajames@linux.ibm.com>2021-07-16 17:03:26 -0500
committerPavel Machek <pavel@ucw.cz>2021-08-20 11:00:06 +0200
commit419066324e19a47b98cdcf5defda42de555a8957 (patch)
tree161eeb1283f1c4a6cca6e25cd037088058c2f33d /drivers/leds
parent5d823d6d69853ae07786ddf786f7693b57e76beb (diff)
leds: leds-core: Implement the retain-state-shutdown property
Read the retain-state-shutdown device tree property to set the existing LED_RETAIN_AT_SHUTDOWN flag. Then check the flag when unregistering, and if set, don't set the brightness to OFF. This is useful for systems that want to keep the HW state of the LED across reboots. Signed-off-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Pavel Machek <pavel@ucw.cz>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/led-class.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index f704391d57a8..f4bb02f6e042 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -350,10 +350,15 @@ int led_classdev_register_ext(struct device *parent,
if (ret < 0)
return ret;
- if (init_data->fwnode)
+ if (init_data->fwnode) {
fwnode_property_read_string(init_data->fwnode,
"linux,default-trigger",
&led_cdev->default_trigger);
+
+ if (fwnode_property_present(init_data->fwnode,
+ "retain-state-shutdown"))
+ led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;
+ }
} else {
proposed_name = led_cdev->name;
}
@@ -444,7 +449,8 @@ void led_classdev_unregister(struct led_classdev *led_cdev)
/* Stop blinking */
led_stop_software_blink(led_cdev);
- led_set_brightness(led_cdev, LED_OFF);
+ if (!(led_cdev->flags & LED_RETAIN_AT_SHUTDOWN))
+ led_set_brightness(led_cdev, LED_OFF);
flush_work(&led_cdev->set_brightness_work);