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[Mariusz <knoife.1@xxxxxxxxx>]

In SteamOS kernel the descriptor size check is skipped entirely.

https://github.com/ValveSoftware/steamos_kernel/commit/7d6f2508304edddc5ab07f87f62b5b267840ab17

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https://bugs.launchpad.net/bugs/1511855

Title:
   Some Sony Dualshock 4 controllers do not work in kernel 3.15+

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I'm testing in Ubuntu 15.10 with kernel 4.2.0-16.19 but this bug
  report actually applies to ALL kernels starting at 3.15 until the
  current 4.3rc7 and is not limited to Ubuntu.

  I have a brand new Sony DualShock 4 that seems to use a slightly
  different protocol than the hid-sony driver expects. I'm not sure why
  this controller is different. Maybe updated firmware from Sony or
  maybe because it has never been connected to a PS4. Whatever the case,
  the device descriptor size is different from what hid-sony expects and
  because of that it does not remap the descriptor table as required.
  This causes only the trackpad to function (the trackpad uses a
  different code path) and none of the other controls work. So basically
  the controller does not work at all.

  I have created a patch that fixes it. I have only tested the patch
  against kernel 4.2 and 4.3 but it's simple enough that it should be
  trivially portable to any 3.15+ kernel. The attached patch is based
  against the Ubuntu mainline-crack git v4.2 kernel.

  I posted to the LKML asking if the descriptor size check was even
  necessary but never got a response so I left it in.

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