[RFC][PATCH] Add support for hook switch on ams-delta

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Hi,

This trivial patch adds gpio-keys compatible platform device definition to 
ams-delta board, that supports hook switch found on this videophone. It is 
derived from similiar definitions found in other boards code. The patch is 
based on linux-2.6.30-rc5. Any comments are welcome.

Cheers,
Janusz
diff -Npru a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
--- a/arch/arm/mach-omap1/board-ams-delta.c	2009-05-17 17:58:18.000000000 +0200
+++ b/arch/arm/mach-omap1/board-ams-delta.c	2009-05-17 16:22:59.000000000 +0200
@@ -15,6 +15,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/input.h>
+#include <linux/gpio_keys.h>
 #include <linux/platform_device.h>
 
 #include <mach/hardware.h>
@@ -213,10 +214,35 @@ static struct platform_device ams_delta_
 	.id	= -1
 };
 
+static struct gpio_keys_button ams_delta_gpio_keys_buttons[] = {
+	[0] = {
+		.desc		= "hook_switch",
+		.type		= EV_SW,		/* or EV_KEY ? */
+		.code		= SW_HEADPHONE_INSERT,	/* or a new one ? */
+		.active_low	= 1,
+		.gpio		= AMS_DELTA_GPIO_PIN_HOOK_SWITCH,
+		.debounce_interval = 10,
+	},
+};
+
+static struct gpio_keys_platform_data ams_delta_gpio_keys = {
+	.buttons		= ams_delta_gpio_keys_buttons,
+	.nbuttons		= ARRAY_SIZE(ams_delta_gpio_keys_buttons),
+};
+
+static struct platform_device ams_delta_gpio_keys_device = {
+	.name			= "gpio-keys",
+	.id			= -1,
+	.dev			= {
+		.platform_data	= &ams_delta_gpio_keys,
+	},
+};
+
 static struct platform_device *ams_delta_devices[] __initdata = {
 	&ams_delta_kp_device,
 	&ams_delta_lcd_device,
 	&ams_delta_led_device,
+	&ams_delta_gpio_keys_device,
 };
 
 static void __init ams_delta_init(void)
@@ -233,6 +259,13 @@ static void __init ams_delta_init_irq(vo
 
 	omap_usb_init(&ams_delta_usb_config);
 	platform_add_devices(ams_delta_devices, ARRAY_SIZE(ams_delta_devices));
+
+	omap_cfg_reg(P20_1610_GPIO4); /* is this required? */
+
+	/* The hook switch state could be exposed over sysfs with gpio_export().
+	 * This should be done after the gpio-keys driver calls gpio_request(),
+	 * but I don't know how to do this from outside of the driver. */
+	/* gpio_export(AMS_DELTA_GPIO_PIN_HOOK_SWITCH, 0); */
 }
 
 static void __init ams_delta_map_io(void)

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