[ARM] 4420/2: AT91: GPIO buttons on SAM9261-EK board

Register the GPIO-connected buttons on the SAM9261-EK board as a
"gpio-keys" platform device.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 66 insertions, 0 deletions

diff --git a/arch/arm/mach-at91/board-sam9261ek.c b/arch/arm/mach-at91/board-sam9261ek.c
index 579b41f0c328..42e172cb0f49 100644
--- a/arch/arm/mach-at91/board-sam9261ek.c
+++ b/arch/arm/mach-at91/board-sam9261ek.c
@@ -28,6 +28,8 @@
 #include <linux/spi/ads7846.h>
 #include <linux/dm9000.h>
 #include <linux/fb.h>
+#include <linux/gpio_keys.h>
+#include <linux/input.h>
 
 #include <video/atmel_lcdc.h>
 
@@ -333,6 +335,68 @@ static struct atmel_lcdfb_info __initdata ek_lcdc_data;
 #endif
 
 
+/*
+ * GPIO Buttons
+ */
+#if defined(CONFIG_KEYBOARD_GPIO) || defined(CONFIG_KEYBOARD_GPIO_MODULE)
+static struct gpio_keys_button ek_buttons[] = {
+        {
+                .gpio           = AT91_PIN_PA27,
+                .keycode        = BTN_0,
+                .desc           = "Button 0",
+                .active_low     = 1,
+        },
+        {
+                .gpio           = AT91_PIN_PA26,
+                .keycode        = BTN_1,
+                .desc           = "Button 1",
+                .active_low     = 1,
+        },
+        {
+                .gpio           = AT91_PIN_PA25,
+                .keycode        = BTN_2,
+                .desc           = "Button 2",
+                .active_low     = 1,
+        },
+        {
+                .gpio           = AT91_PIN_PA24,
+                .keycode        = BTN_3,
+                .desc           = "Button 3",
+                .active_low     = 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_PB27, 0);  /* btn0 */
+        at91_set_deglitch(AT91_PIN_PB27, 1);
+        at91_set_gpio_input(AT91_PIN_PB26, 0);  /* btn1 */
+        at91_set_deglitch(AT91_PIN_PB26, 1);
+        at91_set_gpio_input(AT91_PIN_PB25, 0);  /* btn2 */
+        at91_set_deglitch(AT91_PIN_PB25, 1);
+        at91_set_gpio_input(AT91_PIN_PB24, 0);  /* btn3 */
+        at91_set_deglitch(AT91_PIN_PB24, 1);
+
+        platform_device_register(&ek_button_device);
+}
+#else
+static void __init ek_add_device_buttons(void) {}
+#endif
+
 static void __init ek_board_init(void)
 {
         /* Serial */
@@ -360,6 +424,8 @@ static void __init ek_board_init(void)
 #endif
         /* LCD Controller */
         at91_add_device_lcdc(&ek_lcdc_data);
+        /* Push Buttons */
+        ek_add_device_buttons();
 }
 
 MACHINE_START(AT91SAM9261EK, "Atmel AT91SAM9261-EK")