hidapi: does not retrieve serial number of device on macos x

[folkert <fo...@va...>]

Hi,

I'm working on porting ClewareControl (for usb devices by
www.cleware.de) to MacOS X.
This clewarecontrol includes a commandline utility to configure/set/read
those devices and development libraries for C++, Python and Perl.
http://www.vanheusden.com/clewarecontrol/
I don't have acces to a mac myself unfortuantely so I have to ask others
to test for me.

I ported clewarecontrol to hidapi and all runs fine on linux.
On macos x, though, it doesn't show the serial number. This is rather
essential as it is needed to distinguish what device to control when you
have multiple connected.
The hidtest program included in hidapi doesn't show the serial either:

>>>>>     Device Found
>>>>>       type: 0d50 0008
>>>>>       path: USB_0d50_0008_0x100110a50
>>>>>       serial_number:
>>>>>       Manufacturer: Cleware GmbH
>>>>>       Product:      USB-Ampel
>>>>>       Release:      1d
>>>>>       Interface:    -1

The serial number ought to be 900705 (decimal) or DBE61 (hex).
lsusb -vvv looks like:

Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x0d50 Cleware GmbH
  idProduct          0x0008
  bcdDevice            0.19
  iManufacturer           1 Cleware GmbH
  iProduct                2 USB-Ampel
  iSerial                 3 00023D9      <--- note: this is the device I have at home, not the DBE61 one on the mac version
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              440mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              0
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      48
         Report Descriptors:
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              50
Device Status:     0x0000
  (Bus Powered)

Using libusb it does get the serial number but then retrieving
measurements doesn't work as it is an HID device.

For the test we used
https://github.com/downloads/signal11/hidapi/hidapi-0.7.0.zip as well as
the git version (March 25, 2013).

The output of dtruss (macos version of strace) can be found at:
http://vanheusden.com/clewarecontrol/dtruss.txt.gz

In case someone wants to see what on earth I'm doing, I've uploaded a
test-version at
http://vanheusden.com/clewarecontrol/clewarecontrol-3.1.tgz
The most interesting part is USBaccessBasic.cpp.

Anyone any idea?


Folkert van Heusden

-- 
Nagios user? Check out CoffeeSaint - the versatile Nagios status
viewer! http://www.vanheusden.com/java/CoffeeSaint/
----------------------------------------------------------------------
Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com