linux-kernel - [PATCH 2/2] led: triggers: Add LED_INIT_DEFAULT

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Date:   Sun,  9 Dec 2018 19:49:42 +0100
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     linux-leds@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jacek.anaszewski@...il.com,
        krzk@...nel.org
Subject: [PATCH 2/2] led: triggers: Add LED_INIT_DEFAULT_TRIGGER flag

Add the flag LED_INIT_DEFAULT_TRIGGER for indicating that trigger
being set is a default trigger for the LED class device, and
thus it should be initialized with settings provided in the fwnode.

Set the flag in the led_trigger_set_default(). It is expected to be
cleared in the activate() op of a trigger after trigger fwnode
initialization data is parsed and applied. This should happen only
once after LED class device registration, to allow leaving triggers
in the idle state on re-apply and let the users apply their own
settings without being interfered with the default ones.

Signed-off-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
---
 drivers/leds/led-triggers.c | 2 ++
 include/linux/leds.h        | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 52b12e601ebe..9421222ca7a0 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -201,10 +201,12 @@ void led_trigger_set_default(struct led_classdev *led_cdev)
 	down_write(&led_cdev->trigger_lock);
 	list_for_each_entry(trig, &trigger_list, next_trig) {
 		if (!strcmp(led_cdev->default_trigger, trig->name)) {
+			led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER;
 			led_trigger_set(led_cdev, trig);
 			break;
 		}
 	}
+
 	up_write(&led_cdev->trigger_lock);
 	up_read(&triggers_list_lock);
 }
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 7393a316d9fa..6f05a5816371 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -51,6 +51,7 @@ struct led_classdev {
 #define LED_PANIC_INDICATOR	BIT(20)
 #define LED_BRIGHT_HW_CHANGED	BIT(21)
 #define LED_RETAIN_AT_SHUTDOWN	BIT(22)
+#define LED_INIT_DEFAULT_TRIGGER BIT(23)
 
 	/* set_brightness_work / blink_timer flags, atomic, private. */
 	unsigned long		work_flags;
-- 
2.11.0