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
diff --git a/blacklist.json b/blacklist.json
new file mode 100644
index 0000000..f112a7b
--- /dev/null
+++ b/blacklist.json
@@ -0,0 +1,3 @@
+{
+ "buses": []
+}