input: Allow updating of keyboard LEDs

Add a function which returns a new keyboard LED value when the LEDs need
updating.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/input/input.c b/drivers/input/input.c
index 5de8d9d005..954ecec595 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -275,6 +275,7 @@ static struct input_key_xlate *process_modifier(struct input_config *config,
 			if (config->flags & FLAG_SCROLL_LOCK)
 				leds |= INPUT_LED_SCROLL;
 			config->leds = leds;
+			config->leds_changed = flip;
 		}
 	}
 
@@ -586,6 +587,14 @@ void input_allow_repeats(struct input_config *config, bool allow_repeats)
 	config->allow_repeats = allow_repeats;
 }
 
+int input_leds_changed(struct input_config *config)
+{
+	if (config->leds_changed)
+		return config->leds;
+
+	return -1;
+}
+
 int input_add_tables(struct input_config *config, bool german)
 {
 	struct kbd_entry *entry;