/*
* GPIO keyboard
*/
#if defined(CONFIG_KEYBOARD_MATRIX) || defined(CONFIG_KEYBOARD_MATRIX_MODULE)
static const uint32_t ek_keymap[] = {
/* KEY(row, col, keycode) */
KEY(0, 0, KEY_0),
KEY(0, 1, KEY_1),
KEY(0, 2, KEY_2),
KEY(0, 3, KEY_3),

KEY(1, 0, KEY_4),
KEY(1, 1, KEY_5),
KEY(1, 2, KEY_6),
KEY(1, 3, KEY_7),

KEY(2, 0, KEY_8),
KEY(2, 1, KEY_9),
KEY(2, 2, KEY_COMMA),
KEY(2, 3, KEY_ESC),

KEY(3, 0, KEY_E),
KEY(3, 1, KEY_UP),
KEY(3, 2, KEY_ENTER),
KEY(3, 3, KEY_DOWN),
};

static const struct matrix_keymap_data ek_keymap_data = {
.keymap = ek_keymap,
.keymap_size = ARRAY_SIZE(ek_keymap),
};

static const uint32_t ek_row_gpios[] =
{ /* MB(X6) */
AT91_PIN_PB21, /* ISI_D1 */
AT91_PIN_PB22, /* ISI_D2 */
AT91_PIN_PB24, /* ISI_D4 */
AT91_PIN_PB26 /* ISI_D6 */
};

static const uint32_t ek_col_gpios[] =
{
AT91_PIN_PB28, /* ISI_PCK */
AT91_PIN_PB23, /* ISI_D3 */
AT91_PIN_PB25, /* ISI_D5 */
AT91_PIN_PB27 /* ISI_D7 */
};

static struct matrix_keypad_platform_data ek_mkp_pdata = {
.keymap_data = &ek_keymap_data,
.row_gpios = ek_row_gpios,
.col_gpios = ek_col_gpios,
.num_row_gpios = ARRAY_SIZE(ek_row_gpios),
.num_col_gpios = ARRAY_SIZE(ek_col_gpios),
.col_scan_delay_us = 10,
.debounce_ms = 10,
.wakeup = 1,
.active_low = 1,
};

static struct platform_device ek_mkp_device = {
.name = "matrix-keypad",
.id = -1,
.dev = {
.platform_data = &ek_mkp_pdata,
},
};

static void __init ek_add_device_mkp(void)
{
int i;

for (i = 0; i < ARRAY_SIZE(ek_row_gpios); i++) {
at91_set_GPIO_periph(ek_row_gpios[i], 1);
at91_set_deglitch(ek_row_gpios[i], 1);
}

for (i = 0; i < ARRAY_SIZE(ek_col_gpios); i++)
at91_set_gpio_output(ek_col_gpios[i], 0);

platform_device_register(&ek_mkp_device);

}
#else
static void __init ek_add_device_gpio_mkp(void) {}
#endif
...
static void __init ek_board_init(void)
{
...
/* GPIO keyboard */
ek_add_device_mkp();
/* AC97 */
...