[ARM] 4759/1: [AT91] Buttons on CSB300

Support for the 3 GPIO-connected buttons on the CSB300 board.

Based on wakeup testing code from David Brownell.

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

1 files changed, 61 insertions, 0 deletions

diff --git a/arch/arm/mach-at91/board-csb337.c b/arch/arm/mach-at91/board-csb337.c
index d0aa20c9383e..51cb3c8cc601 100644
--- a/arch/arm/mach-at91/board-csb337.c
+++ b/arch/arm/mach-at91/board-csb337.c
@@ -25,6 +25,8 @@
 #include <linux/platform_device.h>
 #include <linux/spi/spi.h>
 #include <linux/mtd/physmap.h>
+#include <linux/input.h>
+#include <linux/gpio_keys.h>
 
 #include <asm/hardware.h>
 #include <asm/setup.h>
@@ -156,6 +158,63 @@ static struct platform_device csb_flash = {
         .num_resources  = ARRAY_SIZE(csb_flash_resources),
 };
 
+/*
+ * GPIO Buttons (on CSB300)
+ */
+#if defined(CONFIG_KEYBOARD_GPIO) || defined(CONFIG_KEYBOARD_GPIO_MODULE)
+static struct gpio_keys_button csb300_buttons[] = {
+        {
+                .gpio           = AT91_PIN_PB29,
+                .code           = BTN_0,
+                .desc           = "sw0",
+                .active_low     = 1,
+                .wakeup         = 1,
+        },
+        {
+                .gpio           = AT91_PIN_PB28,
+                .code           = BTN_1,
+                .desc           = "sw1",
+                .active_low     = 1,
+                .wakeup         = 1,
+        },
+        {
+                .gpio           = AT91_PIN_PA21,
+                .code           = BTN_2,
+                .desc           = "sw2",
+                .active_low     = 1,
+                .wakeup         = 1,
+        }
+};
+
+static struct gpio_keys_platform_data csb300_button_data = {
+        .buttons        = csb300_buttons,
+        .nbuttons       = ARRAY_SIZE(csb300_buttons),
+};
+
+static struct platform_device csb300_button_device = {
+        .name           = "gpio-keys",
+        .id             = -1,
+        .num_resources  = 0,
+        .dev            = {
+                .platform_data  = &csb300_button_data,
+        }
+};
+
+static void __init csb300_add_device_buttons(void)
+{
+        at91_set_gpio_input(AT91_PIN_PB29, 0);  /* sw0 */
+        at91_set_deglitch(AT91_PIN_PB29, 1);
+        at91_set_gpio_input(AT91_PIN_PB28, 0);  /* sw1 */
+        at91_set_deglitch(AT91_PIN_PB28, 1);
+        at91_set_gpio_input(AT91_PIN_PA21, 0);  /* sw2 */
+        at91_set_deglitch(AT91_PIN_PA21, 1);
+
+        platform_device_register(&csb300_button_device);
+}
+#else
+static void __init csb300_add_device_buttons(void) {}
+#endif
+
 static void __init csb337_board_init(void)
 {
         /* Serial */
@@ -177,6 +236,8 @@ static void __init csb337_board_init(void)
         at91_add_device_mmc(0, &csb337_mmc_data);
         /* NOR flash */
         platform_device_register(&csb_flash);
+        /* Switches on CSB300 */
+        csb300_add_device_buttons();
 }
 
 MACHINE_START(CSB337, "Cogent CSB337")