1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index ca5149ea7312..5246e8fef2b2 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -214,3 +214,26 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
                 return 0x21;
         return -ENOENT;
 }
+
+
+/**
+ * gadget_supports_altsettings - return true if altsettings work
+ * @gadget: the gadget in question
+ */
+static inline bool gadget_supports_altsettings(struct usb_gadget *gadget)
+{
+        /* PXA 21x/25x/26x has no altsettings at all */
+        if (gadget_is_pxa(gadget))
+                return false;
+
+        /* PXA 27x and 3xx have *broken* altsetting support */
+        if (gadget_is_pxa27x(gadget))
+                return false;
+
+        /* SH3 hardware just doesn't do altsettings */
+        if (gadget_is_sh(gadget))
+                return false;
+
+        /* Everything else is *presumably* fine ... */
+        return true;
+}