K750 fixes in hidpp-rework branch (was: Re: UPower 0.9.21)

[Peter Wu]

> > A notification should appear within a second of the request.
> 
> 17:33:40.645 Send       report_id=10 short device=02 DEV2
> type=09                         params=0F 01 01 00  17:33:40.676
> Recv       report_id=11 long  device=02 DEV2
> type=09                         params=0F 01 01 00  00 00 00 00  00 00 00
> 00  00 00 00 00  00 17:33:41.542 Recv       report_id=11 long  device=02
> DEV2 type=09                         params=10 22 01 11  05 FA 47 4F  4F 44
> 00 00  00 00 00 00  00
> 
> Ah I recognize this!
> 
> If I'm not mistaken the battery level is 0x22 so should be 34 %
> And the light 0x0111 so 273 lux (which seems correct to me).

Makes sense, please test the updated code in 
https://git.lekensteyn.nl/upower/?h=hidpp-rework . There is still a FIXME, 
currently I assume that the device is charging whenever there is light, but 
this is very likely wrong.

There is also a possibility to add battery voltage, but it is not documented.

22 - battery percentage (34%)
01 11 - lumenosity (273 lux)
05 fa - battery voltage with unknown conversion rules?
47 4f 4f 44 - ASCII "GOOD" (??)

0x672 is known to be 2.67793237653V (from the K750 spec[1]), I do not know 
what the use is for that "GOOD" text.

Peter

 [1]: 
https://lekensteyn.nl/files/logitech/4301_k750_solarkeyboard_lightandbattery.pdf
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