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Subject: Re: Apple Bluetooth devices: Battery level?
From: Bastien Nocera <hadess@hadess.net>
To: Jiri Kosina <jkosina@suse.cz>
Cc: linux-bluetooth@vger.kernel.org,
	linux-input <linux-input@vger.kernel.org>
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Date: Fri, 12 Feb 2010 15:41:35 +0000
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On Tue, 2009-06-16 at 11:59 +0200, Jiri Kosina wrote:
> On Sat, 13 Jun 2009, Iain Hibbert wrote:
> 
> > Sorry, I posted a parsed version of the report descriptor previously
> > though I failed to cross post:
> > 
> > Collection page=Generic_Desktop usage=Mouse
> >   Input id=2 size=1 count=1 page=Button usage=Button_1 Variable, logical range 0..1
> >   Input id=2 size=1 count=1 page=Button usage=Button_2 Variable, logical range 0..1
> >   Input id=2 size=1 count=1 page=Button usage=Button_3 Variable, logical range 0..1
> >   Input id=2 size=1 count=1 page=Button usage=Button_4 Variable, logical range 0..1
> >   Input id=2 size=4 count=1 page=0x0000 usage=0x0000 Const Variable, logical range 0..1
> > Collection page=Generic_Desktop usage=Pointer
> >   Input id=2 size=8 count=1 page=Generic_Desktop usage=X Variable Relative, logical range -127..127
> >   Input id=2 size=8 count=1 page=Generic_Desktop usage=Y Variable Relative, logical range -127..127
> >   Input id=2 size=8 count=1 page=Consumer usage=AC_Pan Variable Relative, logical range -127..127
> >   Input id=2 size=8 count=1 page=Generic_Desktop usage=Wheel Variable Relative, logical range -127..127
> > End collection
> >   Input id=2 size=8 count=1 page=0x00ff usage=0x00c0 Variable, logical range -127..127
> > Feature id=71 size=8 count=1 page=Device_Controls usage=Battery_Strength Variable NoPref Volatile, logical range 0..100
> > End collection
> > As you can see, there is a Feature report relating to the Battery 
> > Strength, but I do not know what to do with that. I suppose that it is 
> > to be polled in order to return a percentage value..
> 
> Yes, it has to be polled. But at least the initial value should be 
> retrieved during the very initialization of the device -- both USB and 
> Bluetooth implementations this in usbhid_init_reports()/hidp_start() -- 
> they query INPUT and FEATURE reports during device initialization.

Any hints/example code on how to do that? Or is this something you'd
want to work on?

Cheers