drivers/usbhost_hub: Add support to Multiple TT HS HUB

This is the case for USB2517 USB HUB. Also improved the driver to
avoid mistakes: initially I changed g_id[3], but the in register
there is another field where we need to pass this size again. So
it is better to use ARRAY_SIZE() macro to avoid mistakes.

Signed-off-by: Alan C. Assis <acassis@gmail.com>

Author: acassis

drivers/usbhost/usbhost_hub.c

@@ -103,6 +103,10 @@
 
 #define PORT_INDX(x) ((x) - 1)
 
+/* Array size to avoid mistake adding new item to g_id */
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
 /****************************************************************************
  * Private Types
  ****************************************************************************/
@@ -184,7 +188,7 @@ static int usbhost_disconnected(FAR struct usbhost_class_s *hubclass);
  * used to associate the USB host hub class to a connected USB hub.
  */
 
-static const struct usbhost_id_s g_id[2] =
+static const struct usbhost_id_s g_id[] =
 {
   {
       USB_CLASS_HUB,  /* base         */
@@ -196,7 +200,14 @@ static const struct usbhost_id_s g_id[2] =
   {
       USB_CLASS_HUB,  /* base         */
       0,              /* subclass     */
-      1,              /* proto HS hub */
+      1,              /* proto Single TT HS hub */
+      0,              /* vid          */
+      0               /* pid          */
+  },
+  {
+      USB_CLASS_HUB,  /* base         */
+      0,              /* subclass     */
+      2,              /* proto Multiple TT HS hub */
       0,              /* vid          */
       0               /* pid          */
   }
@@ -208,7 +219,7 @@ static struct usbhost_registry_s g_hub =
 {
   NULL,                   /* flink    */
   usbhost_create,         /* create   */
-  2,                      /* nids     */
+  ARRAY_SIZE(g_id),       /* nids     */
   g_id                    /* id[]     */
 };