Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753688Ab1BFTdp (ORCPT ); Sun, 6 Feb 2011 14:33:45 -0500 Received: from smtp-out-015.synserver.de ([212.40.185.15]:1360 "HELO smtp-out-014.synserver.de" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with SMTP id S1753816Ab1BFTdn (ORCPT ); Sun, 6 Feb 2011 14:33:43 -0500 X-SynServer-TrustedSrc: 1 X-SynServer-AuthUser: lars@laprican.de X-SynServer-PPID: 24265 From: Lars-Peter Clausen To: Anton Vorontsov Cc: Rodolfo Giometti , Grazvydas Ignotas , linux-kernel@vger.kernel.org, Lars-Peter Clausen Subject: [PATCH 02/14] POWER: bq27x00: Improve temperature precession Date: Sun, 6 Feb 2011 01:47:59 +0100 Message-Id: <1296953291-10373-3-git-send-email-lars@metafoo.de> X-Mailer: git-send-email 1.7.2.3 In-Reply-To: <1296953291-10373-1-git-send-email-lars@metafoo.de> References: <1296953291-10373-1-git-send-email-lars@metafoo.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1052 Lines: 31 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 --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/