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, 13 insertions, 1 deletions

diff --git a/include/input.h b/include/input.h
index c1af259e26..ad120e47f5 100644
--- a/include/input.h
+++ b/include/input.h
@@ -43,7 +43,8 @@ struct input_config {
 	/* Which modifiers are active (1 bit for each MOD_... value) */
 	uchar modifiers;
 	uchar flags;		/* active state keys (FLAGS_...) */
-	uchar leds;		/* active LEDS (INPUT_LED_...) */
+	uchar leds;		/* active LEDs (INPUT_LED_...) */
+	uchar leds_changed;	/* LEDs that just changed */
 	uchar num_tables;	/* number of modifier tables */
 	int prev_keycodes[INPUT_BUFFER_LEN];	/* keys held last time */
 	int num_prev_keycodes;	/* number of prev keys */
@@ -162,6 +163,17 @@ void input_set_delays(struct input_config *config, int repeat_delay_ms,
 void input_allow_repeats(struct input_config *config, bool allow_repeats);
 
 /**
+ * Check if keyboard LEDs need to be updated
+ *
+ * This can be called after input_tstc() to see if keyboard LEDs need
+ * updating.
+ *
+ * @param config	Input state
+ * @return -1 if no LEDs need updating, other value if they do
+ */
+int input_leds_changed(struct input_config *config);
+
+/**
  * Set up the key map tables
  *
  * This must be called after input_init() or keycode decoding will not work.