From 828320c1af4c4b1d14011c3ff2f30e96845dd956 Mon Sep 17 00:00:00 2001
From: Neil Booth <kyuupichan@gmail.com>
Date: Sat, 6 Feb 2016 14:33:26 +0900
Subject: [PATCH] trezor: provide a default interface number.

---
 lib/plugins.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/plugins.py b/lib/plugins.py
index 7cdb4bc4..0a6754c2 100644
--- a/lib/plugins.py
+++ b/lib/plugins.py
@@ -455,7 +455,9 @@ class DeviceMgr(PrintError):
         for d in hid.enumerate(0, 0):
             product_key = (d['vendor_id'], d['product_id'])
             if product_key in self.recognised_hardware:
-                devices.append(Device(d['path'], d['interface_number'],
+                # Older versions of hid don't provide interface_number
+                interface_number = d.get('interface_number', 0)
+                devices.append(Device(d['path'], interface_number,
                                       d['serial_number'], product_key))
 
         # Now find out what was disconnected