From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752925AbdLEWXz (ORCPT ); Tue, 5 Dec 2017 17:23:55 -0500 Received: from mail-wm0-f67.google.com ([74.125.82.67]:42989 "EHLO mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752747AbdLEWXs (ORCPT ); Tue, 5 Dec 2017 17:23:48 -0500 X-Google-Smtp-Source: AGs4zMYaGhBa9FEV3t7D+Ke9ys42/7Rgab11Q0+Ohsgsq9iAZivjdkkqOzW6MCtgn5gXvuKVpA+T5w== Date: Tue, 5 Dec 2017 23:23:43 +0100 From: Julian Andres Klode To: Ognjen Galic , Jonathan Corbet , "Rafael J. Wysocki" , Len Brown , Darren Hart , Andy Shevchenko , Henrique de Moraes Holschuh , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, platform-driver-x86@vger.kernel.org, ibm-acpi-devel@lists.sourceforge.net Subject: Re: [PATCH v2] thinkad_acpi: Support the battery wear control Message-ID: <20171205222224.5dcc4u67jhixdyiz@jak-x230> References: <20171203225640.GA11655@thinkpad> <20171205142228.lrfds2ih7tgf7ovy@christoph-lap> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20171205142228.lrfds2ih7tgf7ovy@christoph-lap> Accept-Language: de-DE, de, en-GB, en-US, en User-Agent: NeoMutt/20171027 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 05, 2017 at 03:22:28PM +0100, Christoph Böhmwalder wrote: > On Sun, Dec 03, 2017 at 11:56:40PM +0100, Ognjen Galic wrote: > > Add support for the ACPI batteries on newer thinkpad models > > (>Sandy Bridge) that support the setting of start and stop > > thresholds. > > > > The actual interface to the driver is a extension for the > > existing ACPI battery driver. This was done so that users > > can write transparently to the interface of the ACPI battery > > driver and dont have to use some private interface > > (for ex. /sys/devices/platform/thinkpad_acpi/). > > > > Two new interfaces are created: > > > > /sys/class/power_supply/BAT{0,1}/charge_start_threshold > > /sys/class/power_supply/BAT{0,1}/charge_stop_threshold > > Just tried this on my X1 Carbon (i7-3667U Ivy Lake): > > # cat /sys/class/power_supply/BAT0/charge_stop_threshold > 100 > # cat /sys/class/power_supply/BAT0/charge_start_threshold > 100 > > That doesn't seem to make any sense. Is my battery somehow reporting > false values here? Any way to cross check these values? It means that both values are 0 (default). The first one is wrongly mapped to 100, but should probably be reported as 0. Also, the values are not mangled correctly when writing: 100 as a stop threshold should be written as 0, and and 100 as a start threshold should be illegal, giving you: start = [0, 99] stop = [1, 100] Which is what my patch series a few years ago implemented. I never got to integrate that with the acpi battery driver, though. -- debian developer - deb.li/jak | jak-linux.org - free software dev ubuntu core developer i speak de, en