Quoting Doug Anderson (2024-02-13 17:17:34)

Hi,

On Fri, Feb 9, 2024 at 11:10 PM Stephen Boyd [off-list ref] wrote:

quoted

Describe the set of pins used to connect the detachable keyboard on
detachable ChromeOS devices. The set of pins is called the "pogo pins".
It's basically USB 2.0 with an extra pin for base detection. We expect
to find a keyboard on the other side of this connector with a specific
vid/pid, so describe that as a child device at the port of the usb
device connected upstream.

Can you remind me what the side effects would be if a different
VID/PID shows up there? I know it's not an end-user scenario, but I
have a pre-production "coachz" keyboard that's actually programmed
incorrectly and shows up as the wrong PID. Presumably I could either
throw the old hardware away or figure out a way to re-program it and
it's really not a big deal, but just curious what happens...

As far as I know nothing happens besides ChromeOS userspace treats the
keyboard as "external" so things like smarter base detection, e.g.
wraparound keyboard detection or kickstand mode, may not work. I think
you get a popup box telling you the keyboard isn't the trusted one.

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