Add support for DFU Runtime class for devices

This is really just a few descriptors and then answering to the
request from the host to reboot into DFU mode.

That latter part is delegated to the app since this is platform
specific.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

src/device/usbd.c

@@ -167,6 +167,20 @@ static usbd_class_driver_t const usbd_class_drivers[] =
       .sof              = NULL
   },
   #endif
+
+  #if CFG_TUD_DFU_RT
+  {
+      .class_code       = TUD_DFU_APP_CLASS,
+    //.subclass_code    = TUD_DFU_APP_SUBCLASS
+      .init             = dfu_rtd_init,
+      .reset            = dfu_rtd_reset,
+      .open             = dfu_rtd_open,
+      .control_request  = dfu_rtd_control_request,
+      .control_complete = dfu_rtd_control_complete,
+      .xfer_cb          = dfu_rtd_xfer_cb,
+      .sof              = NULL
+  },
+  #endif
 };
 
 enum { USBD_CLASS_DRIVER_COUNT = TU_ARRAY_SIZE(usbd_class_drivers) };

src/device/usbd.h

@@ -304,6 +304,21 @@ TU_ATTR_WEAK bool tud_vendor_control_complete_cb(uint8_t rhport, tusb_control_re
   /* Endpoint In */\
   7, TUSB_DESC_ENDPOINT, _epin, TUSB_XFER_BULK, U16_TO_U8S_LE(_epsize), 0
 
+//------------- DFU Runtime -------------//
+#define TUD_DFU_APP_CLASS    (TUSB_CLASS_APPLICATION_SPECIFIC)
+#define TUD_DFU_APP_SUBCLASS 0x01u
+
+// Length of template descriptr: 18 bytes
+#define TUD_DFU_RT_DESC_LEN (9 + 9)
+
+// DFU runtime descriptor
+// Interface number, string index, attributes, detach timeout, transfer size
+#define TUD_DFU_RT_DESCRIPTOR(_itfnum, _stridx, _attr, _timeout, _xfer_size) \
+  /* Interface */ \
+  9, TUSB_DESC_INTERFACE, _itfnum, 0, 0, TUD_DFU_APP_CLASS, TUD_DFU_APP_SUBCLASS, DFU_PROTOCOL_RT, _stridx, \
+  /* Function */ \
+  9, DFU_DESC_FUNCTIONAL, _attr, U16_TO_U8S_LE(_timeout), U16_TO_U8S_LE(_xfer_size), U16_TO_U8S_LE(0x0101)
+
 
 #ifdef __cplusplus
  }