ARM: mach-shmobile: lager: support GPIO switches

The lager board has pins 1 - 4 of SW2 wired up to GPIO pins.
This patch allows access to those pins as KEYS 1 - 4 using
gpio-keys.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/arch/arm/mach-shmobile/board-lager.c b/arch/arm/mach-shmobile/board-lager.c
index 406fac1302da3e25455c57c48a29c7592a54610d..1e99b17767bb9f72be70750e056b7dfe660670fc 100644 (file)
--- a/arch/arm/mach-shmobile/board-lager.c
+++ b/arch/arm/mach-shmobile/board-lager.c
@@ -18,6 +18,9 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+#include <linux/gpio.h>
+#include <linux/gpio_keys.h>
+#include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/leds.h>
@@ -46,11 +49,27 @@ static struct gpio_led lager_leds[] = {
        },
 };
 
-static struct gpio_led_platform_data lager_leds_pdata = {
+static __initdata struct gpio_led_platform_data lager_leds_pdata = {
        .leds           = lager_leds,
        .num_leds       = ARRAY_SIZE(lager_leds),
 };
 
+/* GPIO KEY */
+#define GPIO_KEY(c, g, d, ...) \
+       { .code = c, .gpio = g, .desc = d, .active_low = 1 }
+
+static __initdata struct gpio_keys_button gpio_buttons[] = {
+       GPIO_KEY(KEY_4,         RCAR_GP_PIN(1, 28),     "SW2-pin4"),
+       GPIO_KEY(KEY_3,         RCAR_GP_PIN(1, 26),     "SW2-pin3"),
+       GPIO_KEY(KEY_2,         RCAR_GP_PIN(1, 24),     "SW2-pin2"),
+       GPIO_KEY(KEY_1,         RCAR_GP_PIN(1, 14),     "SW2-pin1"),
+};
+
+static __initdata struct gpio_keys_platform_data lager_keys_pdata = {
+       .buttons        = gpio_buttons,
+       .nbuttons       = ARRAY_SIZE(gpio_buttons),
+};
+
 static const struct pinctrl_map lager_pinctrl_map[] = {
        /* SCIF0 (CN19: DEBUG SERIAL0) */
        PIN_MAP_MUX_GROUP_DEFAULT("sh-sci.6", "pfc-r8a7790",
@@ -72,6 +91,9 @@ static void __init lager_add_standard_devices(void)
        platform_device_register_data(&platform_bus, "leds-gpio", -1,
                                      &lager_leds_pdata,
                                      sizeof(lager_leds_pdata));
+       platform_device_register_data(&platform_bus, "gpio-keys", -1,
+                                     &lager_keys_pdata,
+                                     sizeof(lager_keys_pdata));
 }
 
 static const char *lager_boards_compat_dt[] __initdata = {