implement retrieving the USB reportDescriptor & it's size (#95)

Author: DacoTaco

gc/ogc/usb.h

@@ -12,7 +12,9 @@
 #define USB_FAILED						1
 
 #define USB_CLASS_HID					0x03
+#define USB_SUBCLASS_NONE				0x00
 #define USB_SUBCLASS_BOOT				0x01
+#define USB_PROTOCOL_NONE				0x00
 #define USB_PROTOCOL_KEYBOARD			0x01
 #define USB_PROTOCOL_MOUSE				0x02
 
@@ -66,6 +68,7 @@
 #define USB_DT_ENDPOINT_SIZE			7
 #define USB_DT_ENDPOINT_AUDIO_SIZE		9	/* Audio extension */
 #define USB_DT_HID_SIZE					9
+#define USB_DT_MINREPORT_SIZE			8
 #define USB_DT_HUB_NONVAR_SIZE			7
 
 /* control message request type bitmask */
@@ -190,6 +193,8 @@ void USB_FreeDescriptors(usb_devdesc *udd);
 
 s32 USB_GetGenericDescriptor(s32 fd,u8 type,u8 index,u8 interface,void *data,u32 size);
 s32 USB_GetHIDDescriptor(s32 fd,u8 interface,usb_hiddesc *uhd,u32 size);
+s32 USB_GetReportDescriptorSize(s32 fd, u8 interface);
+s32 USB_GetReportDescriptor(s32 fd, u8 interface, void* data, u16 size);
 
 s32 USB_GetDeviceDescription(s32 fd,usb_devdesc *devdesc);
 s32 USB_DeviceRemovalNotifyAsync(s32 fd,usbcallback cb,void *userdata);

libogc/usb.c

@@ -1085,6 +1085,41 @@ s32 USB_GetHIDDescriptor(s32 fd,u8 interface,usb_hiddesc *uhd,u32 size)
 	return retval;
 }
 
+s32 USB_GetReportDescriptorSize(s32 fd, u8 interface)
+{	
+	//Retrieve complete HID descriptor
+	//in testing it was always 9 bytes, but in the HID specifications it says it can be more (if the device has more than 1 descriptor).
+	//currently we only support 1 thou
+	usb_hiddesc hiddesc;
+	s32 retval = USB_GetHIDDescriptor(fd, interface, &hiddesc, USB_DT_HID_SIZE);
+	
+	if(retval < 0)
+		return retval;
+	
+	if(hiddesc.bLength > USB_DT_HID_SIZE)
+		return -1;
+	
+	retval = -2;
+	for(int i = 0; i < hiddesc.bNumDescriptors; i++)
+	{
+		if(hiddesc.descr[i].bDescriptorType == USB_DT_REPORT)
+		{
+			retval = hiddesc.descr[i].wDescriptorLength;
+			break;
+		}
+	}
+	
+	return retval;
+}
+
+s32 USB_GetReportDescriptor(s32 fd, u8 interface, void* data, u16 size)
+{
+	if (data == NULL || size < USB_DT_MINREPORT_SIZE)
+		return IPC_EINVAL;
+
+	return USB_GetGenericDescriptor(fd, USB_DT_REPORT, 0, interface, data, size);
+}
+
 void USB_FreeDescriptors(usb_devdesc *udd)
 {
 	int iConf, iInterface;