tree 90a5f34b4c8589a2d4137d3a5b262eedd0b24e66
parent 7fce52c4afdc5e73a9e740dc9b90f1e61ae8cea4
author Thieu Le <thieule@chromium.org> 1334938746 -0700
committer Gerrit <chrome-bot@google.com> 1334954818 -0700

shill: Generalize detection of cdc_ether modem device tty interface.

Previously, shill looked for the tty interface in a cdc_ether modem
device sysfs directory tree at a particular directory depth.  Some cdc_ether
modem devices (eg. E362) have the tty interface one directory lower.  This CL
changes the code to look for the tty directory at all directory levels
relative to the USB device directory.

BUG=chromium-os:28499
TEST=Unit test, manually tested on Y3300 and E362

Change-Id: I4a67bfa21322bbb3aabf2799008e513e193a0744
Reviewed-on: https://gerrit.chromium.org/gerrit/20695
Commit-Ready: Thieu Le <thieule@chromium.org>
Reviewed-by: Thieu Le <thieule@chromium.org>
Tested-by: Thieu Le <thieule@chromium.org>
Reviewed-by: Jason Glasgow <jglasgow@chromium.org>