[PATCH 0/2] usb: Add support for EHSET

[Jack Pham <jackp@codeaurora.org>]

PATCH 1/2 is a device driver supporting the Embedded Host High-Speed
Electrical Test (EHSET) test fixture. This driver supports the set of
VID/PIDs specified in the EHSET and activates the various test (TEST_J,
TEST_K, et al) modes by issuing a USB_PORT_FEAT_TEST SetFeature request
to the hub, or by directly toggling USB_PORT_FEAT_SUSPEND, in the case
of the port suspend test.

In RFC/PATCH 2/2 *[1] the SINGLE_STEP_SET_FEATURE test is implemented. The
fixture driver designates test selector=6 and sends the USB_PORT_FEAT_TEST
request directly to the root hub. The EHCI hub driver is expected to handle
this by calling functions in the queue driver to submit separate QTDs for
the SETUP and DATA/STATUS stages of a GetDescriptor request, in essence
duplicating the work of ehci_urb_enqueue(), but with the requisite added
delay.

Alan Stern wrote:
> It does sound like a lot of mucking around inside ehci-hcd for a
> relatively small benefit.  But if people want it, I guess it can be
> added.

Thus this patch is an RFC because I'm pretty sure this method of "mucking
around" isn't gonna sit well with most folks. So any alternative suggestions
are welcome.

*[1] This second patch is mostly unmodified from the original commit made on
the out-of-tree MSM kernel, so please excuse trivial style inconsistencies:
https://www.codeaurora.org/cgit/quic/la/kernel/msm/commit?id=c2084930fd49f04571627be0762ff40e5c5d90d8

Manu Gautam (2):
  usb: misc: EHSET Test Fixture device driver for host compliance
  usb: ehci: Add support for SINGLE_STEP_SET_FEATURE test of EHSET

 drivers/usb/host/ehci-hub.c |  144 ++++++++++++++++++++++++++++++++++++++++-
 drivers/usb/host/ehci-q.c   |  101 ++++++++++++++++++++++++++++
 drivers/usb/misc/Kconfig    |   13 ++++
 drivers/usb/misc/Makefile   |    1 +
 drivers/usb/misc/ehset.c    |  152 +++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 410 insertions(+), 1 deletions(-)
 create mode 100644 drivers/usb/misc/ehset.c

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