user@debian:~/src/linux-2.6.36-rc6$ cat .config | grep GPIO
CONFIG_GENERIC_GPIO=y
# CONFIG_MTD_NAND_GPIO is not set
CONFIG_KEYBOARD_GPIO=y
CONFIG_I2C_GPIO=y
CONFIG_SPI_GPIO=y
CONFIG_ARCH_REQUIRE_GPIOLIB=y
CONFIG_GPIOLIB=y
# CONFIG_DEBUG_GPIO is not set
# CONFIG_GPIO_SYSFS is not set
# Memory mapped GPIO expanders:
# CONFIG_GPIO_IT8761E is not set
# I2C GPIO expanders:
# CONFIG_GPIO_MAX7300 is not set
# CONFIG_GPIO_MAX732X is not set
# CONFIG_GPIO_PCA953X is not set
# CONFIG_GPIO_PCF857X is not set
# CONFIG_GPIO_SX150X is not set
# CONFIG_GPIO_ADP5588 is not set
# PCI GPIO expanders:
# SPI GPIO expanders:
# CONFIG_GPIO_MAX7301 is not set
# CONFIG_GPIO_MCP23S08 is not set
# CONFIG_GPIO_MC33880 is not set
# AC97 GPIO expanders:
# MODULbus GPIO expanders:
# CONFIG_HTC_EGPIO is not set
# CONFIG_USB_GPIO_VBUS is not set
user@debian:~/src/linux-2.6.36-rc6$ cat .config | grep ATMEL
CONFIG_HAVE_NAND_ATMEL_BUSWIDTH_16=y
# CONFIG_MTD_NAND_ATMEL_BUSWIDTH_16 is not set
CONFIG_MTD_NAND_ATMEL=y
CONFIG_MTD_NAND_ATMEL_ECC_SOFT=y
# CONFIG_MTD_NAND_ATMEL_ECC_NONE is not set
# CONFIG_ATMEL_TCLIB is not set
CONFIG_ATMEL_SSC=y
# CONFIG_TOUCHSCREEN_ATMEL_TSADCC is not set
CONFIG_SERIAL_ATMEL=y
CONFIG_SERIAL_ATMEL_CONSOLE=y
CONFIG_SERIAL_ATMEL_PDC=y
# CONFIG_SERIAL_ATMEL_TTYAT is not set
CONFIG_SPI_ATMEL=y
CONFIG_HAVE_FB_ATMEL=y
CONFIG_FB_ATMEL=y
CONFIG_FB_ATMEL_SK=y
CONFIG_FB_ATMEL_SK_480X272=y
# CONFIG_FB_ATMEL_SK_800X480 is not set
CONFIG_USB_GADGET_ATMEL_USBA=y
CONFIG_USB_ATMEL_USBA=y
CONFIG_MMC_ATMELMCI=y
# CONFIG_MMC_ATMELMCI_DMA is not set

//-----------------------------------------------------------------------------
/*
* Matrix keyboard
*/
static const uint32_t ek_keymap[] = {
KEY(0, 0, KEY_1),
KEY(0, 1, KEY_2),
KEY(1, 0, KEY_3),
KEY(1, 1, KEY_4),
};
static struct matrix_keymap_data ek_keymap_data = {
.keymap = ek_keymap,
.keymap_size = ARRAY_SIZE(ek_keymap),
};
static const int ek_col_gpios[] =
{ AT91_PIN_PB18, AT91_PIN_PB4,};
static const int ek_row_gpios[] =
{ AT91_PIN_PB19, AT91_PIN_PB5,};
static struct matrix_keypad_platform_data ek_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),
.num_row_gpios = 2,
.num_col_gpios = 2,
.active_low = 1,
.col_scan_delay_us = 10,
.debounce_ms = 10,
.wakeup = 1,
};
static struct platform_device ek_kbd_device = {
.name = "matrix-keypad",
.id = -1,
.dev = {
.platform_data = &ek_pdata,
},
};

at91_set_gpio_output(AT91_PIN_PB4, 1);
at91_set_gpio_output(AT91_PIN_PB18, 1);
at91_set_gpio_input(AT91_PIN_PB15, 1);
at91_set_gpio_input(AT91_PIN_PB19, 1);
platform_device_register(&ek_kbd_device);