[cups.bugs] [MOD] STR #4128: libusb-based USB backend: Further fixes

[Till Kamppeter]

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[STR New]

Based on work together with Ubuntu bug reporters I succeeded to fix several
issues with the libusb-based CUPS backend. Now practically all real USB
printers (no USB->Parallel adapters) work.

Patches for 1.6.x and 1.5.x are attached.

Following Ubuntu bugs are solved:

https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1000253
  Brother HL-1440 printing extra page with PJL codes

https://bugs.launchpad.net/ubuntu/+source/cups/+bug/995111
  Print failure since upgrade to 12.04

For following bug I have added a configuration option:

https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1001028
  Delay after every print job on USB

Blacklisting the usblp kernel module is not needed any more, the usblp
backend correctly detaches and re-attaches the module.

The changes I have done are:

- Support for mon-directional devices, both protocol-1 devices and 
  devices where no read endpoint is found.

- Soft reset specific to the "PRINTER" device class. This allows a 
  reset without reconnecting.

- When closing the device, it will also get reset to its original 
  configuration, before re-attaching the usblp kernel module.

- Added option "usb-unidir" to force the backend into uni-directional 
  mode. This allows to work around problems with bi-di communications,
  especially also a delay at the end of the job caused by closing the 
  read channel (happens only for some devices). Also useful for
  debugging.

- Some extra debug messages.

- Added a missing libusb_free_config_descriptor().

Can this be put into CUPS 1.6.x/1.5.x? Thanks.

Link: http://www.cups.org/str.php?L4128
Version: 1.6-current
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