struct_matrix_keymap_data(9) suse man page | unix.com

STRUCT 
MATRIX_KEYMAP(9) 					  Input Subsystem					   STRUCT MATRIX_KEYMAP(9)

NAME
       struct_matrix_keymap_data - keymap for matrix keyboards

SYNOPSIS
       struct matrix_keymap_data {
	 const uint32_t * keymap;
	 unsigned int keymap_size;
       };

MEMBERS
       keymap
	   pointer to array of uint32 values encoded with KEY macro representing keymap

       keymap_size
	   number of entries (initialized) in this keymap

DESCRIPTION
       This structure is supposed to be used by platform code to supply keymaps to drivers that implement matrix-like keypads/keyboards.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010						   STRUCT MATRIX_KEYMAP(9)