Add multi-touch descriptors (experimental)

teensy3/usb_desc.c

@@ -264,6 +264,65 @@ static uint8_t joystick_report_desc[] = {
 };
 #endif
 
+#ifdef MULTITOUCH_INTERFACE
+// https://forum.pjrc.com/threads/32331-USB-HID-Touchscreen-support-needed
+// https://msdn.microsoft.com/en-us/library/windows/hardware/jj151563%28v=vs.85%29.aspx
+// https://msdn.microsoft.com/en-us/library/windows/hardware/jj151565%28v=vs.85%29.aspx
+// https://msdn.microsoft.com/en-us/library/windows/hardware/ff553734%28v=vs.85%29.aspx
+// 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)
+        0x09, 0x04,             // Usage (Touch Screen)
+        0xa1, 0x01,             // Collection (Application)
+        0x09, 0x22,             //   Usage (Finger)
+        0xA1, 0x02,             //   Collection (Logical)
+        0x09, 0x42,             //     Usage (Tip Switch)
+        0x15, 0x00,             //     Logical Minimum (0)
+        0x25, 0x01,             //     Logical Maximum (1)
+        0x75, 0x01,             //     Report Size (1)
+        0x95, 0x01,             //     Report Count (1)
+        0x81, 0x02,             //     Input (variable,absolute)
+        0x09, 0x30,             //     Usage (Pressure)
+        0x25, 0x7F,             //     Logical Maximum (127)
+        0x75, 0x07,             //     Report Size (7)
+        0x95, 0x01,             //     Report Count (1)
+        0x81, 0x02,             //     Input (variable,absolute)
+        0x09, 0x51,             //     Usage (Contact Identifier)
+        0x26, 0xFF, 0x00,       //     Logical Maximum (255)
+        0x75, 0x08,             //     Report Size (8)
+        0x95, 0x02,             //     Report Count (1)
+        0x81, 0x02,             //     Input (variable,absolute)
+        0x05, 0x01,             //     Usage Page (Generic Desktop)
+        0x09, 0x30,             //     Usage (X)
+        0x09, 0x31,             //     Usage (Y)
+        0x26, 0xFF, 0x7F,       //     Logical Maximum (32767)
+        0x65, 0x00,             //     Unit (None)  <-- probably needs real units?
+        0x75, 0x10,             //     Report Size (16)
+        0x95, 0x01,             //     Report Count (2)
+        0x81, 0x02,             //     Input (variable,absolute)
+        0xC0,                   //   End Collection
+        0x05, 0x0D,             //   Usage Page (Digitizer)
+        0x27, 0xFF, 0xFF, 0, 0, //   Logical Maximum (65535)
+        0x75, 0x10,             //   Report Size (16)
+        0x95, 0x01,             //   Report Count (1)
+        0x09, 0x56,             //   Usage (Scan Time)
+        0x81, 0x02,             //   Input (variable,absolute)
+        0x09, 0x54,             //   Usage (Contact Count)
+        0x25, 0x0A,             //   Logical Maximum (10)
+        0x75, 0x08,             //   Report Size (8)
+        0x95, 0x01,             //   Report Count (1)
+        0x81, 0x02,             //   Input (variable,absolute)
+        0x05, 0x0d,             //   Usage Page (Digitizers)
+        0x09, 0x55,             //   Usage (Contact Count Maximum)
+        0x25, 0x0A,             //   Logical Maximum (10)
+        0x75, 0x08,             //   Report Size (8)
+        0x95, 0x01,             //   Report Count (1)
+        0xB1, 0x02,             //   Feature (variable,absolute)
+        0xC0                    // End Collection
+};
+#endif
+
 #ifdef SEREMU_INTERFACE
 static uint8_t seremu_report_desc[] = {
         0x06, 0xC9, 0xFF,                       // Usage Page 0xFFC9 (vendor defined)
@@ -421,7 +480,15 @@ static uint8_t flightsim_report_desc[] = {
 #define AUDIO_INTERFACE_DESC_SIZE	0
 #endif
 
-#define CONFIG_DESC_SIZE		AUDIO_INTERFACE_DESC_POS+AUDIO_INTERFACE_DESC_SIZE
+#define MULTITOUCH_INTERFACE_DESC_POS	AUDIO_INTERFACE_DESC_POS+AUDIO_INTERFACE_DESC_SIZE
+#ifdef  MULTITOUCH_INTERFACE
+#define MULTITOUCH_INTERFACE_DESC_SIZE	9+9+7
+#define MULTITOUCH_HID_DESC_OFFSET	MULTITOUCH_INTERFACE_DESC_POS+9
+#else
+#define MULTITOUCH_INTERFACE_DESC_SIZE	0
+#endif
+
+#define CONFIG_DESC_SIZE		MULTITOUCH_INTERFACE_DESC_POS+MULTITOUCH_INTERFACE_DESC_SIZE
 
 
 
@@ -1060,6 +1127,35 @@ static uint8_t config_descriptor[CONFIG_DESC_SIZE] = {
 	5,					// bRefresh, 5 = 32ms
 	0,					// bSynchAddress
 #endif
+
+#ifdef MULTITOUCH_INTERFACE
+        // interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
+        9,                                      // bLength
+        4,                                      // bDescriptorType
+        MULTITOUCH_INTERFACE,                   // bInterfaceNumber
+        0,                                      // bAlternateSetting
+        1,                                      // bNumEndpoints
+        0x03,                                   // bInterfaceClass (0x03 = HID)
+        0x00,                                   // bInterfaceSubClass
+        0x00,                                   // bInterfaceProtocol
+        0,                                      // iInterface
+        // HID interface descriptor, HID 1.11 spec, section 6.2.1
+        9,                                      // bLength
+        0x21,                                   // bDescriptorType
+        0x11, 0x01,                             // bcdHID
+        0,                                      // bCountryCode
+        1,                                      // bNumDescriptors
+        0x22,                                   // bDescriptorType
+        LSB(sizeof(multitouch_report_desc)),    // wDescriptorLength
+        MSB(sizeof(multitouch_report_desc)),
+        // endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
+        7,                                      // bLength
+        5,                                      // bDescriptorType
+        MULTITOUCH_ENDPOINT | 0x80,             // bEndpointAddress
+        0x03,                                   // bmAttributes (0x03=intr)
+        MULTITOUCH_SIZE, 0,                     // wMaxPacketSize
+        1,                                      // bInterval
+#endif // KEYMEDIA_INTERFACE
 };
 
 
@@ -1170,6 +1266,10 @@ const usb_descriptor_list_t usb_descriptor_list[] = {
 #ifdef KEYMEDIA_INTERFACE
         {0x2200, KEYMEDIA_INTERFACE, keymedia_report_desc, sizeof(keymedia_report_desc)},
         {0x2100, KEYMEDIA_INTERFACE, config_descriptor+KEYMEDIA_HID_DESC_OFFSET, 9},
+#endif
+#ifdef MULTITOUCH_INTERFACE
+        {0x2200, MULTITOUCH_INTERFACE, multitouch_report_desc, sizeof(multitouch_report_desc)},
+        {0x2100, MULTITOUCH_INTERFACE, config_descriptor+MULTITOUCH_HID_DESC_OFFSET, 9},
 #endif
         {0x0300, 0x0000, (const uint8_t *)&string0, 0},
         {0x0301, 0x0409, (const uint8_t *)&usb_string_manufacturer_name, 0},