input: Allow repeat filtering to be disabled

Generally the input library handles processing of a list of scanned keys.
Repeated keys need to be generated based on a timer in this case, since all
that is provided is a list of keys current depressed.

Keyboards which do their own scanning will resend codes when they want to
inject a repeating key. Provide a function which tells the input library to
accept repeating keys and not to try to second-guess the caller.

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

drivers/input/input.c

@@ -413,8 +413,8 @@ static int _input_send_keycodes(struct input_config *config, int keycode[],
 		 * insert another character if we later realise that we
 		 * have missed a repeat slot.
 		 */
-		is_repeat = config->repeat_rate_ms &&
-			(int)get_timer(config->next_repeat_ms) >= 0;
+		is_repeat = config->allow_repeats || (config->repeat_rate_ms &&
+			(int)get_timer(config->next_repeat_ms) >= 0);
 		if (!is_repeat)
 			return 0;
 	}
@@ -495,6 +495,11 @@ void input_set_delays(struct input_config *config, int repeat_delay_ms,
 	config->repeat_rate_ms = repeat_rate_ms;
 }
 
+void input_allow_repeats(struct input_config *config, bool allow_repeats)
+{
+	config->allow_repeats = allow_repeats;
+}
+
 int input_add_tables(struct input_config *config)
 {
 	int ret;

include/input.h

@@ -57,6 +57,7 @@ struct input_config {
 	 *		unknown
 	 */
 	int (*read_keys)(struct input_config *config);
+	bool allow_repeats;		/* Don't filter out repeats */
 	unsigned int next_repeat_ms;	/* Next time we repeat a key */
 	unsigned int repeat_delay_ms;	/* Time before autorepeat starts */
 	unsigned int repeat_rate_ms;	/* Autorepeat rate in ms */
@@ -143,6 +144,24 @@ void input_set_delays(struct input_config *config, int repeat_delay_ms,
 	       int repeat_rate_ms);
 
 /**
+ * Tell the input layer whether to allow the caller to determine repeats
+ *
+ * Generally the input library handles processing of a list of scanned keys.
+ * Repeated keys need to be generated based on a timer in this case, since all
+ * that is provided is a list of keys current depressed.
+ *
+ * Keyboards which do their own scanning will resend codes when they want to
+ * inject a repeating key. This function can be called at start-up to select
+ * this behaviour.
+ *
+ * @param config	Input state
+ * @param allow_repeats	true to repeat depressed keys every time
+ *			input_send_keycodes() is called, false to do normal
+ *			keyboard repeat processing with a timer.
+ */
+void input_allow_repeats(struct input_config *config, bool allow_repeats);
+
+/**
  * Set up the key map tables
  *
  * This must be called after input_init() or keycode decoding will not work.