From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755413AbZHJP23 (ORCPT ); Mon, 10 Aug 2009 11:28:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755400AbZHJP21 (ORCPT ); Mon, 10 Aug 2009 11:28:27 -0400 Received: from ru.mvista.com ([213.79.90.228]:11245 "EHLO buildserver.ru.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1755398AbZHJP2Z (ORCPT ); Mon, 10 Aug 2009 11:28:25 -0400 Date: Mon, 10 Aug 2009 19:28:25 +0400 From: Anton Vorontsov To: Pavel Machek Cc: Brian Swetland , Anton Vorontsov , David Woodhouse , linux-kernel Subject: Re: power_supply class/framework question Message-ID: <20090810152825.GA4624@oksana.dev.rtsoft.ru> Reply-To: avorontsov@ru.mvista.com References: <20090810150011.GA1471@ucw.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20090810150011.GA1471@ucw.cz> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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@gmail.com irc://irc.freenode.net/bd2