From 8e8b7925d233743ad007fa7daf0b1ddb940cdb3a Mon Sep 17 00:00:00 2001
From: Olivier Dony <odo@openerp.com>
Date: Wed, 16 Nov 2016 14:52:33 +0100
Subject: [PATCH] [FIX] hw_escpos: auto-detect endpoint address

Instead of hardcoding the IN & OUT endpoint
addresses for the ESC/POS printers, we now
attempt to auto-detect them.

This should increase compatibility with many
compatible thermal printers that are simply
using a different address, such as the
- STMicroelectronics POS58 Printer USB
- HU HAI SUNCSW Receipt Printer Co.,Ltd. Gprinter USB Printer

Fixes #12890
---
 addons/hw_escpos/controllers/main.py |  8 ++++++--
 addons/hw_escpos/escpos/printer.py   | 19 ++++++++++++++++++-
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/addons/hw_escpos/controllers/main.py b/addons/hw_escpos/controllers/main.py
index 0b91dc0d37e..23672e12385 100644
--- a/addons/hw_escpos/controllers/main.py
+++ b/addons/hw_escpos/controllers/main.py
@@ -104,8 +104,12 @@ class EscposDriver(Thread):
   
         printers = self.connected_usb_devices()
         if len(printers) > 0:
-            self.set_status('connected','Connected to '+printers[0]['name'])
-            return Usb(printers[0]['vendor'], printers[0]['product'])
+            print_dev = Usb(printers[0]['vendor'], printers[0]['product'])
+            self.set_status(
+                'connected',
+                "Connected to %s (in=0x%02x,out=0x%02x)" % (printers[0]['name'], print_dev.in_ep, print_dev.out_ep)
+            )
+            return print_dev
         else:
             self.set_status('disconnected','Printer Not Found')
             return None
diff --git a/addons/hw_escpos/escpos/printer.py b/addons/hw_escpos/escpos/printer.py
index 1f32875a5cb..d52668b50f9 100644
--- a/addons/hw_escpos/escpos/printer.py
+++ b/addons/hw_escpos/escpos/printer.py
@@ -13,7 +13,7 @@ from time import sleep
 class Usb(Escpos):
     """ Define USB printer """
 
-    def __init__(self, idVendor, idProduct, interface=0, in_ep=0x82, out_ep=0x01):
+    def __init__(self, idVendor, idProduct, interface=0, in_ep=None, out_ep=None):
         """
         @param idVendor  : Vendor ID
         @param idProduct : Product ID
@@ -42,6 +42,23 @@ class Usb(Escpos):
                 self.device.detach_kernel_driver(self.interface) 
             self.device.set_configuration()
             usb.util.claim_interface(self.device, self.interface)
+
+            cfg = self.device.get_active_configuration()
+            intf = cfg[(0,0)] # first interface
+            if self.in_ep is None:
+                # Attempt to detect IN/OUT endpoint addresses
+                try:
+                    is_IN = lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_IN
+                    is_OUT = lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_OUT
+                    endpoint_in = usb.util.find_descriptor(intf, custom_match=is_IN)
+                    endpoint_out = usb.util.find_descriptor(intf, custom_match=is_OUT)
+                    self.in_ep = endpoint_in.bEndpointAddress
+                    self.out_ep = endpoint_out.bEndpointAddress
+                except usb.core.USBError:
+                    # default values for officially supported printers
+                    self.in_ep = 0x82
+                    self.out_ep = 0x01
+
         except usb.core.USBError as e:
             raise HandleDeviceError(e)