Introduce a platform_device (machine) specific callback function
which gets called when the amount of power we can draw from Vbus
has changed.

Index: linux-2.6.21-moko/drivers/usb/gadget/s3c2410_udc.c
===================================================================
--- linux-2.6.21-moko.orig/drivers/usb/gadget/s3c2410_udc.c
+++ linux-2.6.21-moko/drivers/usb/gadget/s3c2410_udc.c
@@ -1404,12 +1404,25 @@
 	return IRQ_HANDLED;
 }
 
+static int s3c2410_vbus_draw(struct usb_gadget *_gadget, unsigned int ma)
+{
+	struct s3c2410_udc  *udc;
+
+	dprintk(DEBUG_NORMAL, "s3c2410_vbus_draw()\n");
+
+	if (udc_info && udc_info->vbus_draw)
+		return udc_info->vbus_draw(ma);
+	else
+		return 0;
+}
+
 static const struct usb_gadget_ops s3c2410_ops = {
 	.get_frame          = s3c2410_g_get_frame,
 	.wakeup             = s3c2410_wakeup,
 	.set_selfpowered    = s3c2410_set_selfpowered,
         .pullup             = s3c2410_pullup,
 	.vbus_session	    = s3c2410_udc_vbus_session,
+	.vbus_draw	    = s3c2410_vbus_draw,
 };
 
 /*------------------------- gadget driver handling---------------------------*/
Index: linux-2.6.21-moko/include/asm-arm/arch-s3c2410/udc.h
===================================================================
--- linux-2.6.21-moko.orig/include/asm-arm/arch-s3c2410/udc.h
+++ linux-2.6.21-moko/include/asm-arm/arch-s3c2410/udc.h
@@ -26,7 +26,7 @@
 
 struct s3c2410_udc_mach_info {
 	void	(*udc_command)(enum s3c2410_udc_cmd_e);
- 	void	(*vbus_draw)(unsigned int ma);
+ 	int	(*vbus_draw)(unsigned int ma);
 	unsigned int vbus_pin;
 	unsigned char vbus_pin_inverted;
 };