Make Windows auto-install WinUSB driver.

Apply the Windows Compatible ID descriptor to the CDC interfaces
as well as the vendor-class interface. It seems that Windows will
only automatically install the driver if *all* interface of the device
have the WCID descriptor set to WINUSB.

This will prevent the CDC serial console interface from working on
Windows.

Bumps the bcdDevice so Windows machines that have cached the descriptors
will re-load them.

firmware/usb.c

@@ -16,7 +16,7 @@ __attribute__((__aligned__(4))) const USB_DeviceDescriptor device_descriptor = {
 	.bMaxPacketSize0        = 64,
 	.idVendor               = 0x1209,
 	.idProduct              = 0x7551,
-	.bcdDevice              = 0x0110,
+	.bcdDevice              = 0x0111,
 
 	.iManufacturer          = 0x01,
 	.iProduct               = 0x02,
@@ -212,20 +212,35 @@ __attribute__((__aligned__(4))) const USB_StringDescriptor msft_os = {
 	.bString = u"MSFT100\xee"
 };
 
-__attribute__((__aligned__(4))) const USB_MicrosoftCompatibleDescriptor msft_compatible = {
-	.dwLength = sizeof(USB_MicrosoftCompatibleDescriptor) + sizeof(USB_MicrosoftCompatibleDescriptor_Interface),
+// TODO: this doesn't need to be in RAM if it is copied into usb_ep0_out one packet at a time
+__attribute__((__aligned__(4), __section__(".data"))) const USB_MicrosoftCompatibleDescriptor msft_compatible = {
+	.dwLength = sizeof(USB_MicrosoftCompatibleDescriptor) + 3 * sizeof(USB_MicrosoftCompatibleDescriptor_Interface),
 	.bcdVersion = 0x0100,
 	.wIndex = 0x0004,
-	.bCount = 1,
+	.bCount = 3,
 	.reserved = {0, 0, 0, 0, 0, 0, 0},
 	.interfaces = {
 		{
 			.bFirstInterfaceNumber = 0,
-			.reserved1 = 0,
+			.reserved1 = 0x01,
 			.compatibleID = "WINUSB\0\0",
 			.subCompatibleID = {0, 0, 0, 0, 0, 0, 0, 0},
 			.reserved2 = {0, 0, 0, 0, 0, 0},
-		}
+		},
+		{
+			.bFirstInterfaceNumber = 1,
+			.reserved1 = 0x01,
+			.compatibleID = "WINUSB\0\0",
+			.subCompatibleID = {0, 0, 0, 0, 0, 0, 0, 0},
+			.reserved2 = {0, 0, 0, 0, 0, 0},
+		},
+		{
+			.bFirstInterfaceNumber = 2,
+			.reserved1 = 0x01,
+			.compatibleID = "WINUSB\0\0",
+			.subCompatibleID = {0, 0, 0, 0, 0, 0, 0, 0},
+			.reserved2 = {0, 0, 0, 0, 0, 0},
+		},
 	}
 };
 
@@ -366,11 +381,25 @@ void req_boot_status() {
 	return usb_ep0_in(len);
 }
 
+// TODO: Use the version in the USB library after making it handle descriptors larger than 64 bytes
+static void handle_msft_compatible(const USB_MicrosoftCompatibleDescriptor* msft_compatible) {
+	if (usb_setup.wIndex == 0x0004) {
+		uint16_t len = usb_setup.wLength;
+		if (len > msft_compatible->dwLength) {
+			len = msft_compatible->dwLength;
+		}
+		usb_ep_start_in(0x80, (uint8_t*) msft_compatible, len, true);
+		usb_ep0_out();
+	} else {
+		return usb_ep0_stall();
+	}
+}
+
 void usb_cb_control_setup(void) {
 	uint8_t recipient = usb_setup.bmRequestType & USB_REQTYPE_RECIPIENT_MASK;
 	if (recipient == USB_RECIPIENT_DEVICE) {
 		switch(usb_setup.bRequest) {
-			case 0xee:	  return usb_handle_msft_compatible(&msft_compatible);
+			case 0xee:	  return handle_msft_compatible(&msft_compatible);
 			case REQ_PWR: return req_gpio(usb_setup.wIndex, usb_setup.wValue);
 			case REQ_INFO: return req_info(usb_setup.wIndex);
 			case REQ_BOOT: return req_boot();