colibri_vf: Add separate defconfig for device tree support

[oweals/u-boot.git] / common / usb.c

diff --git a/common/usb.c b/common/usb.c
index 20c614cbcb089eda65f2d9eff4ee61462780535c..6283f3992c7cde77d8af62143c7671a4a427cbcd 100644 (file)
--- a/common/usb.c
+++ b/common/usb.c
@@ -148,6 +148,32 @@ int usb_stop(void)
        return 0;
 }
 
+/******************************************************************************
+ * Detect if a USB device has been plugged or unplugged.
+ */
+int usb_detect_change(void)
+{
+       int i, j;
+       int change = 0;
+
+       for (j = 0; j < USB_MAX_DEVICE; j++) {
+               for (i = 0; i < usb_dev[j].maxchild; i++) {
+                       struct usb_port_status status;
+
+                       if (usb_get_port_status(&usb_dev[j], i + 1,
+                                               &status) < 0)
+                               /* USB request failed */
+                               continue;
+
+                       if (le16_to_cpu(status.wPortChange) &
+                           USB_PORT_STAT_C_CONNECTION)
+                               change++;
+               }
+       }
+
+       return change;
+}
+
 /*
  * disables the asynch behaviour of the control message. This is used for data
  * transfers that uses the exclusiv access to the control and bulk messages.