linux-kernel - Re: [Kernel-discuss] Re: [PATCH 3/8] Universal power supply class (was: battery class)

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Message-ID: <20070506210754.GB10236@zarina>
Date:	Mon, 7 May 2007 01:07:54 +0400
From:	Anton Vorontsov <cbou@...l.ru>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	ian <spyro@....com>, Shem Multinymous <multinymous@...il.com>,
	Greg KH <gregkh@...e.de>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org, kernel-discuss@...dhelds.org
Subject: Re: [Kernel-discuss] Re: [PATCH 3/8] Universal power supply class
	(was: battery class)

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@...l.ru
backup email: ya-cbou@...dex.ru
irc://irc.freenode.org/bd2
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