From a77a9a611fdc074b062dbfcb747cb17681b30ab6 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@openmoko.org>
Date: Tue, 24 Aug 2010 21:09:22 -0300
Subject: [PATCH] lib/usb.c (open_usb): libusb documentation claims that
 considerable bureaucracy is needed before operations can be performed. This
 doesn't seem to be the case, but let's put the code (commented out) anyway,
 since it's been written. (This was done while trying to debug another
 problem.)

---
 lib/usb.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/lib/usb.c b/lib/usb.c
index 07475da..625c74f 100644
--- a/lib/usb.c
+++ b/lib/usb.c
@@ -26,6 +26,10 @@ usb_dev_handle *open_usb(uint16_t default_vendor, uint16_t default_product)
 {
 	const struct usb_bus *bus;
 	struct usb_device *dev;
+	usb_dev_handle *handle;
+#ifdef DO_FULL_USB_BUREAUCRACY
+	int res;
+#endif
 
 	usb_init();
 	usb_find_busses();
@@ -39,7 +43,30 @@ usb_dev_handle *open_usb(uint16_t default_vendor, uint16_t default_product)
 			if (dev->descriptor.idProduct !=
 			    product ? product : default_product)
 				continue;
-			return usb_open(dev);
+			handle = usb_open(dev);
+#ifdef DO_FULL_USB_BUREAUCRACY
+			if (!handle)
+				return NULL;
+			res = usb_set_configuration(handle, 1);
+			if (res < 0) {
+				fprintf(stderr, "usb_set_configuration: %d\n",
+				    res);
+				return NULL;
+			}
+			res = usb_claim_interface(handle, 0);
+			if (res < 0) {
+				fprintf(stderr, "usb_claim_interface: %d\n",
+				    res);
+				return NULL;
+			}
+			res = usb_set_altinterface(handle, 0);
+			if (res < 0) {
+				fprintf(stderr, "usb_set_altinterface: %d\n",
+				    res);
+				return NULL;
+			}
+#endif
+			return handle;
 		}
 	return NULL;
 }