diff options
| author | Eddie James <eajames@linux.ibm.com> | 2021-09-17 00:21:35 +0300 |
|---|---|---|
| committer | Joel Stanley <joel@jms.id.au> | 2021-09-22 05:33:37 +0300 |
| commit | be3d424ea173fa908520ab86a500077be49f4005 (patch) | |
| tree | 3accfeb913a73adff10af7ed36c404a34816e19f | |
| parent | a71f0265b886460ddba1675c39608fc75e0e76df (diff) | |
| download | linux-be3d424ea173fa908520ab86a500077be49f4005.tar.xz | |
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.
OpenBMC-Staging-Count: 1
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Link: https://lore.kernel.org/r/20210916212140.33915-3-eajames@linux.ibm.com
Signed-off-by: Joel Stanley <joel@jms.id.au>
| -rw-r--r-- | drivers/leds/led-class.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 4365c1cc4505..bc66f1035d06 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -351,10 +351,15 @@ 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; } @@ -445,7 +450,8 @@ 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); |