input: gpio_kbd_matrix: add 16 bit rows support

Add a Kconfig option to extend the row type to 16 bits, allowing the
library to handle a 16 row matrix.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>

drivers/input/Kconfig.kbd_matrix

@@ -14,4 +14,10 @@ config INPUT_KBD_MATRIX_THREAD_STACK_SIZE
 	help
 	  Size of the stack used for the keyboard matrix thread.
 
+config INPUT_KBD_MATRIX_16_BIT_ROW
+	bool "16 bit row size support"
+	help
+	  Use a 16 bit type for the internal structure, allow using a matrix
+	  with up to 16 rows if the driver supports it.
+
 endif # INPUT_KBD_MATRIX

include/zephyr/input/input_kbd_matrix.h

@@ -30,7 +30,11 @@
 #define INPUT_KBD_MATRIX_SCAN_OCURRENCES 30U
 
 /** Row entry data type */
+#if CONFIG_INPUT_KBD_MATRIX_16_BIT_ROW
+typedef uint16_t kbd_row_t;
+#else
 typedef uint8_t kbd_row_t;
+#endif
 
 /** Maximum number of rows */
 #define INPUT_KBD_MATRIX_ROW_BITS NUM_BITS(kbd_row_t)