Re: Battery indication for Logitech devices

[marcoshalano@gmail.com]

On 04/04/2022 07:12, Bastien Nocera <hadess@hadess.net> wrote:
> On Mon, 2022-04-04 at 09:10 +0200, Nestor Lopez Casado wrote:
> > Hello,
> >
> > I've got this from asking internally:
> >
> > " The information should be accurate in both BAS and HIDPP
> > interfaces.
> > However, today the BAS interface is limited. Version  2.0 will be
> > better but not yet released. As you have access to the HIDPP, I
> > recommend using only this one. Like this, the type of connection can
> > be ignored (BLE or USB dongle) "
> 
> As per the patch I just sent (HID: logitech-hidpp: Add Signature M650),
> it will unfortunately be difficult to disable the battery reporting
> directly from bluetoothd.
> 
> We can detect whether a Bluetooth device supports HID++, as it has a
> GATT attribute with a Logitech specific UUID[1] (more info/specs
> welcome), but not all the HID++ capable Bluetooth devices seem to be
> detected by the kernel and they need to be added to a list.
> 
> Ideally, the kernel could enable HID++ support for all the Bluetooth
> HID++-capable devices, and we could easily block reporting in upower or
> bluetoothd without having to care at runtime about whether there's a
> separate battery reporting interface because we could assume it was
> always there.
> 
> Any ideas on how to do that?

Any ideas, anyone?
> 
> [1]:
> Device DE:1D:F3:3B:E4:B0 (random)
> 	Name: Logi M650
> 	Alias: Logi M650
> 	Appearance: 0x03c2
> 	Icon: input-mouse
> 	Paired: yes
> 	Trusted: yes
> 	Blocked: no
> 	Connected: no
> 	WakeAllowed: yes
> 	LegacyPairing: no
> 	UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
> 	UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
> 	UUID: Device Information        (0000180a-0000-1000-8000-00805f9b34fb)
> 	UUID: Battery Service           (0000180f-0000-1000-8000-00805f9b34fb)
> 	UUID: Human Interface Device    (00001812-0000-1000-8000-00805f9b34fb)
> 	UUID: Logitech International SA (0000fd72-0000-1000-8000-00805f9b34fb)
> 	UUID: Vendor specific           (00010000-0000-1000-8000-011f2000046d)
> 	Modalias: usb:v046DpB02Ad0009
> 	ManufacturerData Key: 0x0006
> 	ManufacturerData Value:
>    03 00 80                                         ...
> 	ServiceData Key: 0000fd72-0000-1000-8000-00805f9b34fb
> 	ServiceData Value:
>    10 01 01 2a b0 02 02 09                          ...*....
> 
>