[Bluez-devel] Re: Experiences with mx-5000 bluetooth mouse+keyboard combo

[Philip Langdale <philipl@mail.utexas.edu>]

Philip Langdale wrote:
> Philip Langdale wrote:
>> Hi all,
>>
>> I decided to get myself an mx-5000 set this week and I've been fiddling
>> with it and while I've got it working well, I'm not quite there yet. I
>> do want to report my initial findings however.
>>
>> 0) Everything works fine in HID mode. All the buttons on the mouse
>>    and keyboard work correctly at the input level as reported by evtest.
>>
>>
>> 5) The keyboard is in a similar situation but I have not mapped out the
>>    broken usages yet, and even some of the multimedia keys that do work
>>    report different codes from HID mode.
>>
> 
> This is only partially true. There are some keys that don't generate
> input events in either mode, and some keys that generate different codes
> in HCI mode. So, there's two problems there.

I did some more investigation today and came up with useful conclusions.

1) The initial attempt at mapping the usage code is correct, but a later
step in the configuration mangles the codes so they end up incorrect.
(incorrect is a relative term as long as your desktop environment/apps
supports configurable keybindings - so it's not a deal breaker).

This step is:

while (usage->code <= max && test_and_set_bit(usage->code, bit)) {
    usage->code = find_next_zero_bit(bit, max + 1, usage->code);
}

in hidinput_configure_usage.

eg: It mangles KEY_UNDO (131) into KEY_SENDFILE (145) which doesn't seem
very useful.

2) Some of the keys that generated no input events are simply keys that
hidinput_configure_usage doesn't know about. I added entries for them
and now they work (some are mangled, some are not).

3) Much more interestingly, there are multiple keys that generate *no*
meaningful events, even at the hcidump level. I assume that these can
only be made to work by downloading programs to the keyboard (the
mx-5000 and di novo are programmable but the interface is apparently
unknown).

--phil


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