From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753804Ab1BVGqs (ORCPT ); Tue, 22 Feb 2011 01:46:48 -0500 Received: from smtp-out-090.synserver.de ([212.40.185.90]:1079 "EHLO smtp-out-090.synserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752246Ab1BVGmg (ORCPT ); Tue, 22 Feb 2011 01:42:36 -0500 X-SynServer-TrustedSrc: 1 X-SynServer-AuthUser: lars@laprican.de X-SynServer-PPID: 18504 From: Lars-Peter Clausen To: Anton Vorontsov Cc: Pali Rohar , Rodolfo Giometti , Grazvydas Ignotas , linux-kernel@vger.kernel.org, Lars-Peter Clausen Subject: [PATCH v3 04/16] bq27x00: Improve temperature property precession Date: Tue, 22 Feb 2011 07:37:49 +0100 Message-Id: <1298356681-8317-5-git-send-email-lars@metafoo.de> X-Mailer: git-send-email 1.7.2.3 In-Reply-To: <1298356681-8317-1-git-send-email-lars@metafoo.de> References: <1298356681-8317-1-git-send-email-lars@metafoo.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch improves the precession of the temperature property of the bq27x00 driver. By dividing before multiplying the current code effectively cuts of the last decimal digit. This patch fixes it by multiplying before dividing. Signed-off-by: Lars-Peter Clausen Acked-by: Rodolfo Giometti Tested-by: Grazvydas Ignotas --- drivers/power/bq27x00_battery.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c index bb043f9..4f74659 100644 --- a/drivers/power/bq27x00_battery.c +++ b/drivers/power/bq27x00_battery.c @@ -109,7 +109,7 @@ static int bq27x00_battery_temperature(struct bq27x00_device_info *di) if (di->chip == BQ27500) return temp - 2731; else - return ((temp >> 2) - 273) * 10; + return ((temp * 5) - 5463) / 2; } /* -- 1.7.2.3