[ARM] pxa/spitz: add gpio button support (fixes regression)

Updating desc for lid keys and resending patch with proper comments:
Define Spitz buttons as GPIO keys in a way compatible with the old driver:

On/Off: As Suspend EV_PWR key
Raw values of lid sensors SWA and SWB: As EV_SW switches
SWA: Display Down
SWB: Lid Closed
Recommended user space decoding:
SWA==0 & SWB==0: lid opened (landscape mode)
SWA==1 & SWB==0: invalid (or mechanic race condition)
SWA==0 & SWB==1: lid closed with display up (portrait mode or mechanic
                 race condition while closing to display-less mode)
SWA==1 & SWB==1: lid closed with display down (display-less mode)

AK_INT remote trigger is not mapped as input event. Without complete
remote driver and remote pull-up control it has no useful
interpretation.

Signed-off-by: Stanislav Brabec <utx@penguin.cz>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index ee8d6038ce82..82ff5733e4dc 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -15,6 +15,7 @@
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
+#include <linux/gpio_keys.h>
 #include <linux/gpio.h>
 #include <linux/leds.h>
 #include <linux/mtd/physmap.h>
@@ -375,6 +376,43 @@ static struct platform_device spitzkbd_device = {
 };
 
 
+static struct gpio_keys_button spitz_gpio_keys[] = {
+        {
+                .type   = EV_PWR,
+                .code   = KEY_SUSPEND,
+                .gpio   = SPITZ_GPIO_ON_KEY,
+                .desc   = "On/Off",
+                .wakeup = 1,
+        },
+        /* Two buttons detecting the lid state */
+        {
+                .type   = EV_SW,
+                .code   = 0,
+                .gpio   = SPITZ_GPIO_SWA,
+                .desc   = "Display Down",
+        },
+        {
+                .type   = EV_SW,
+                .code   = 1,
+                .gpio   = SPITZ_GPIO_SWB,
+                .desc   = "Lid Closed",
+        },
+};
+
+static struct gpio_keys_platform_data spitz_gpio_keys_platform_data = {
+        .buttons        = spitz_gpio_keys,
+        .nbuttons       = ARRAY_SIZE(spitz_gpio_keys),
+};
+
+static struct platform_device spitz_gpio_keys_device = {
+        .name   = "gpio-keys",
+        .id     = -1,
+        .dev    = {
+                .platform_data  = &spitz_gpio_keys_platform_data,
+        },
+};
+
+
 /*
  * Spitz LEDs
  */
@@ -689,6 +727,7 @@ static struct platform_device sharpsl_rom_device = {
 static struct platform_device *devices[] __initdata = {
         &spitzscoop_device,
         &spitzkbd_device,
+        &spitz_gpio_keys_device,
         &spitzled_device,
         &sharpsl_nand_device,
         &sharpsl_rom_device,