tree 33508802a63aa602f8bbf2cd707733ceb60943a8
parent ba5203120327079edee66792a11d5aa31343dd84
author Patrick Venture <venture@google.com> 1564681332 -0700
committer Patrick Venture <venture@google.com> 1564681902 -0700

frudevice: add i2c bus blacklist json

The fru-device daemon contained a black list internally of buses to not
rescan in the future.  This list was generated automatically by talking
to each bus.  On a system where scanning the devices on a specific bus
can cause problems, extend that blacklist to be something that can be
specified for a machine.

This adds a file blacklist.json, which currently contains one field.  An
array of bus integers named "buses."  This file can be overwritten by a
platform recipe to drop in a list of buses to avoid scanning.

Tested: Verified that an empty, but valid json file (the default file
has no effect).
Tested: Verified that the array with an invalid type of entry is caught,
reported and the program exited.
Tested: Verified that the array with three valid entries prevents the
daemon from scanning the devices on those buses.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I1c426ebed2f7ac073ee45ed8b205e4a176a519ab