Date: Mon, 7 May 2007 01:07:54 +0400
From: Anton Vorontsov <cbou@mail.ru>
To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: ian <spyro@f2s.com>, Shem Multinymous <multinymous@gmail.com>,
       Greg KH <gregkh@suse.de>, David Woodhouse <dwmw2@infradead.org>,
       linux-kernel@vger.kernel.org, kernel-discuss@handhelds.org
Subject: Re: [Kernel-discuss] Re: [PATCH 3/8] Universal power supply class
	(was: battery class)
Message-ID: <20070506210754.GB10236@zarina>
Reply-To: cbou@mail.ru
References: <20070503213139.GC20067@zarina> <41840b750705032155w21d98b5g6236daf9bff66606@mail.gmail.com> <20070505035413.GB21359@khazad-dum.debian.net> <1178372786.3901.4.camel@wirenth> <20070506180937.GB31940@khazad-dum.debian.net>
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On Sun, May 06, 2007 at 03:09:37PM -0300, Henrique de Moraes Holschuh wrote:
> On Sat, 05 May 2007, ian wrote:
> > On Sat, 2007-05-05 at 00:54 -0300, Henrique de Moraes Holschuh wrote:
> > 
> > > Given that USB-power *is* usually also "dumb" (i.e. it doesn't do any
> > > control signaling over the USB bus for power-control purposes),
> > 
> > it might be dumb, but it is useful to know wether the PDA is charging
> > from usb or mains power. and some devices allow one to switch on / off
> > the ability to charge via usb
> 
> Which, at the proper abstraction level provided by this class, means that it
> allows one to switch on or off a power supply channel.
> 
> Laptops let one do this with their batteries, too.  It is the same thing.  I
> didn't check if the class comes with an attribute for "enable/disable this
> power source", but if doesn't, we need to add one: it *is* a generic and
> widely used capability in laptops, and according to you, also on PDAs.

Yup, this is simple matter of adding such attribute (plus implemention
of set_property function, which is trivial).

-- 
Anton Vorontsov
email: cbou@mail.ru
backup email: ya-cbou@yandex.ru
irc://irc.freenode.org/bd2
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