From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Kim, HeungJun" Subject: Re: [PATCH v2 2/2] input: keyboard: MCS5080: support shutdown. Date: Mon, 13 Dec 2010 19:30:22 +0900 Message-ID: <4D05F5BE.8000905@samsung.com> References: <4CE617CD.2090006@samsung.com> <20101213090121.GG21401@core.coreip.homeip.net> Reply-To: riverful.kim@samsung.com Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mailout1.samsung.com ([203.254.224.24]:63781 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756964Ab0LMKae (ORCPT ); Mon, 13 Dec 2010 05:30:34 -0500 Received: from epmmp1 (mailout1.samsung.com [203.254.224.24]) by mailout1.samsung.com (Oracle Communications Messaging Exchange Server 7u4-19.01 64bit (built Sep 7 2010)) with ESMTP id <0LDD00CMS3UVZAA0@mailout1.samsung.com> for linux-input@vger.kernel.org; Mon, 13 Dec 2010 19:30:31 +0900 (KST) Received: from TNRNDGASPAPP1.tn.corp.samsungelectronics.net ([165.213.149.150]) by mmp1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LDD005NK3UVVD@mmp1.samsung.com> for linux-input@vger.kernel.org; Mon, 13 Dec 2010 19:30:31 +0900 (KST) In-reply-to: <20101213090121.GG21401@core.coreip.homeip.net> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Dmitry Torokhov Cc: "linux-input@vger.kernel.org" And the reason to insert powerof() function is that, the MCS50XX series has some HW bugs like following: If the MCS50XX is not yet powered down before the whole system is power= -down, when control pins like a powerup or interrupt is pulluped, the residue current is flow into chips and the chip still consume the p= ower. It seems not be important general PC(if this small device is implemente= d with PC), but it's very important in the mobile device. sorry not to write such specific contents before. Thanks. Regards, HeungJun Kim 2010-12-13 =EC=98=A4=ED=9B=84 6:01, Dmitry Torokhov =EC=93=B4 =EA=B8=80= : > On Fri, Nov 19, 2010 at 03:23:09PM +0900, Kim, HeungJun wrote: >> This patch supports shutdown functions for mcs5080 touchkey >> driver. >> >=20 > Rarely a device needs shutdown method; normally it is enough to simpl= y > cut power off. Why this device needs it? >=20 > Thanks. >=20 -- To unsubscribe from this list: send the line "unsubscribe linux-input" = in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html