Re: Battery indication for Logitech devices

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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?

[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                          ...*....        




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