Add multi-touch definitions (experimental)

teensy3/usb_desc.c

 // https://msdn.microsoft.com/en-us/library/windows/hardware/jj151564%28v=vs.85%29.aspx
 // download.microsoft.com/download/a/d/f/adf1347d-08dc-41a4-9084-623b1194d4b2/digitizerdrvs_touch.docx
 static uint8_t multitouch_report_desc[] = {
-        0x05, 0x0d,             // Usage Page (Digitizer)
+        0x05, 0x0D,             // Usage Page (Digitizer)
         0x09, 0x04,             // Usage (Touch Screen)
         0xa1, 0x01,             // Collection (Application)
         0x09, 0x22,             //   Usage (Finger)
         0x75, 0x08,             //   Report Size (8)
         0x95, 0x01,             //   Report Count (1)
         0x81, 0x02,             //   Input (variable,absolute)
-        0x05, 0x0d,             //   Usage Page (Digitizers)
+        0x05, 0x0D,             //   Usage Page (Digitizers)
         0x09, 0x55,             //   Usage (Contact Count Maximum)
         0x25, 0x0A,             //   Logical Maximum (10)
         0x75, 0x08,             //   Report Size (8)

teensy3/usb_desc.h

   #define ENDPOINT6_CONFIG	ENDPOINT_TRANSIMIT_ONLY
   #define ENDPOINT7_CONFIG	ENDPOINT_TRANSIMIT_ONLY
 
+#elif defined(USB_TOUCHSCREEN)
+  #define VENDOR_ID		0x16C0
+  #define PRODUCT_ID		0x048B
+  #define MANUFACTURER_NAME	{'T','e','e','n','s','y','d','u','i','n','o'}
+  #define MANUFACTURER_NAME_LEN	11
+  #define PRODUCT_NAME		{'K','e','y','b','o','a','r','d','/','T','o','u','c','h','s','c','r','e','e','n'}
+  #define PRODUCT_NAME_LEN	20
+  #define EP0_SIZE		64
+  #define NUM_ENDPOINTS         5
+  #define NUM_USB_BUFFERS	15
+  #define NUM_INTERFACE		4
+  #define SEREMU_INTERFACE      1	// Serial emulation
+  #define SEREMU_TX_ENDPOINT    1
+  #define SEREMU_TX_SIZE        64
+  #define SEREMU_TX_INTERVAL    1
+  #define SEREMU_RX_ENDPOINT    2
+  #define SEREMU_RX_SIZE        32
+  #define SEREMU_RX_INTERVAL    2
+  #define KEYBOARD_INTERFACE    0	// Keyboard
+  #define KEYBOARD_ENDPOINT     3
+  #define KEYBOARD_SIZE         8
+  #define KEYBOARD_INTERVAL     1
+  #define KEYMEDIA_INTERFACE    2	// Keyboard Media Keys
+  #define KEYMEDIA_ENDPOINT     4
+  #define KEYMEDIA_SIZE         8
+  #define KEYMEDIA_INTERVAL     4
+  #define MULTITOUCH_INTERFACE  3	// Touchscreen
+  #define MULTITOUCH_ENDPOINT   5
+  #define MULTITOUCH_SIZE       9
+  #define MULTITOUCH_FINGERS    10
+  #define ENDPOINT1_CONFIG	ENDPOINT_TRANSIMIT_ONLY
+  #define ENDPOINT2_CONFIG	ENDPOINT_RECEIVE_ONLY
+  #define ENDPOINT3_CONFIG	ENDPOINT_TRANSIMIT_ONLY
+  #define ENDPOINT4_CONFIG	ENDPOINT_TRANSIMIT_ONLY
+  #define ENDPOINT5_CONFIG	ENDPOINT_TRANSIMIT_ONLY
+
 #elif defined(USB_MIDI)
   #define VENDOR_ID		0x16C0
   #define PRODUCT_ID		0x0485
 
 #elif defined(USB_AUDIO)
   #define VENDOR_ID		0x16C0
-  #define PRODUCT_ID		0x0485  // TODO: assign unique
+  #define PRODUCT_ID		0x048A
   #define MANUFACTURER_NAME	{'T','e','e','n','s','y','d','u','i','n','o'}
   #define MANUFACTURER_NAME_LEN	11
   #define PRODUCT_NAME		{'T','e','e','n','s','y',' ','A','u','d','i','o'}