linux-kernel - Re: power_supply class/framework question

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Message-ID: <20090810152825.GA4624@oksana.dev.rtsoft.ru>
Date:	Mon, 10 Aug 2009 19:28:25 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Brian Swetland <swetland@...gle.com>,
	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: power_supply class/framework question

On Mon, Aug 10, 2009 at 05:00:11PM +0200, Pavel Machek wrote:
> Hi!
> 
> > (feel free to redirect me to a different mailing list if there's a
> > more appropriate place to ask this question)
> > 
> > I'm working on cleaning up some code to more correctly use the power
> > supply framework (have the battery driver receive notification from
> > the wall/usb power supplies, etc), and ran into a slight snag.  For
> > mobile usb powered devices, we need to know how much current can
> > safely be consumed by the charge circuit -- generally this is one of:
> > none, <500mA or 1000mA, which correspond to "no power supply", "usb
> > power supply", or "wall power supply".
> 
> Actuallly, it is one of 'none', 100mA (min power USB has to supplly),
> 500mA (max powe USB can supply by spec), 1A (wall).
> 
> For example sharp zaurus can only supply cca 300mA out of its port.
> 
> > I can use power_supply_am_i_supplied() to determine if I'm receiving
> > power, but there's no way to determine either how much (if I have one
> > power supply that indicates max current available) or which supply (if
> > I define a separate "ac" and "usb" power supply).
> 
> Should am_i_supplied() just return miliamps?

Or enum power_supply_type, with the following priority:
mains (wall), usb, battery?

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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