[ARM] 5562/2: at91: add gpio button support for at91sam9g20ek

This adds input keyboard gpio support on at91sam9g20ek board.
It adds button 3 and 4.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mach-at91/board-sam9g20ek.c b/arch/arm/mach-at91/board-sam9g20ek.c
index cc270beadd5d67bea4389fd6eed8113177bb3135..a55398ed1211d932266ac4ebace286ffe53490df 100644 (file)
--- a/arch/arm/mach-at91/board-sam9g20ek.c
+++ b/arch/arm/mach-at91/board-sam9g20ek.c
@@ -24,6 +24,8 @@
 #include <linux/platform_device.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/at73c213.h>
+#include <linux/gpio_keys.h>
+#include <linux/input.h>
 #include <linux/clk.h>
 
 #include <mach/hardware.h>
@@ -218,6 +220,56 @@ static struct gpio_led ek_leds[] = {
        }
 };
 
+
+/*
+ * GPIO Buttons
+ */
+#if defined(CONFIG_KEYBOARD_GPIO) || defined(CONFIG_KEYBOARD_GPIO_MODULE)
+static struct gpio_keys_button ek_buttons[] = {
+       {
+               .gpio           = AT91_PIN_PA30,
+               .code           = BTN_3,
+               .desc           = "Button 3",
+               .active_low     = 1,
+               .wakeup         = 1,
+       },
+       {
+               .gpio           = AT91_PIN_PA31,
+               .code           = BTN_4,
+               .desc           = "Button 4",
+               .active_low     = 1,
+               .wakeup         = 1,
+       }
+};
+
+static struct gpio_keys_platform_data ek_button_data = {
+       .buttons        = ek_buttons,
+       .nbuttons       = ARRAY_SIZE(ek_buttons),
+};
+
+static struct platform_device ek_button_device = {
+       .name           = "gpio-keys",
+       .id             = -1,
+       .num_resources  = 0,
+       .dev            = {
+               .platform_data  = &ek_button_data,
+       }
+};
+
+static void __init ek_add_device_buttons(void)
+{
+       at91_set_gpio_input(AT91_PIN_PA30, 1);  /* btn3 */
+       at91_set_deglitch(AT91_PIN_PA30, 1);
+       at91_set_gpio_input(AT91_PIN_PA31, 1);  /* btn4 */
+       at91_set_deglitch(AT91_PIN_PA31, 1);
+
+       platform_device_register(&ek_button_device);
+}
+#else
+static void __init ek_add_device_buttons(void) {}
+#endif
+
+
 static struct i2c_board_info __initdata ek_i2c_devices[] = {
        {
                I2C_BOARD_INFO("24c512", 0x50),
@@ -245,6 +297,8 @@ static void __init ek_board_init(void)
        at91_add_device_i2c(ek_i2c_devices, ARRAY_SIZE(ek_i2c_devices));
        /* LEDs */
        at91_gpio_leds(ek_leds, ARRAY_SIZE(ek_leds));
+       /* Push Buttons */
+       ek_add_device_buttons();
        /* PCK0 provides MCLK to the WM8731 */
        at91_set_B_periph(AT91_PIN_PC1, 0);
        /* SSC (for WM8731) */