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#
# Match a Google device with an interface that supports the simple serial
# driver.
#
# The first rule matches the google VID and records the product name, USB bus
# number and USB device path (the device path is the list of hub ports between
# the root and the device). This becomes a unique name under which the second
# rule creates the symlinks to the serial devices. The second rule will only
# fire if the .GOOGLE_CCD_NAME variable has been set by the first rule. If
# some other udev rule has set the same name previously, there would be a
# conflict, so this name is chosen to be verbose and likely unique.
#
SUBSYSTEMS=="usb", ATTRS{idVendor}=="18d1", ENV{.GOOGLE_CCD_NAME}="$attr{product}-$attr{busnum}-$attr{devpath}"
SUBSYSTEMS=="usb", ENV{.GOOGLE_CCD_NAME}!="", ATTRS{bInterfaceClass}=="ff", ATTRS{bInterfaceSubClass}=="50", ATTRS{bInterfaceProtocol}=="01", OPTIONS+="string_escape=replace", SYMLINK+="google/$env{.GOOGLE_CCD_NAME}/serial/$attr{interface}"
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