Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753288Ab2FREMU (ORCPT ); Mon, 18 Jun 2012 00:12:20 -0400 Received: from mail-gh0-f202.google.com ([209.85.160.202]:38330 "EHLO mail-gh0-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751430Ab2FREIt (ORCPT ); Mon, 18 Jun 2012 00:08:49 -0400 From: Daniel Kurtz To: Dmitry Torokhov , Henrik Rydberg , Joonyoung Shim , Nick Dyer , linux-input@vger.kernel.org Cc: Iiro Valkonen , Benson Leung , Yufeng Shen , Olof Johansson , linux-kernel@vger.kernel.org, Daniel Kurtz Subject: [PATCH 13/22 v4] Input: atmel_mxt_ts - read ID information block in one i2c transaction Date: Mon, 18 Jun 2012 12:08:33 +0800 Message-Id: <1339992522-22073-14-git-send-email-djkurtz@chromium.org> X-Mailer: git-send-email 1.7.7.3 In-Reply-To: <1339992522-22073-1-git-send-email-djkurtz@chromium.org> References: <1339992522-22073-1-git-send-email-djkurtz@chromium.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1821 Lines: 63 Reading the whole info block in one i2c transaction speeds up driver probe significantly, especially on slower i2c busses. Signed-off-by: Daniel Kurtz --- drivers/input/touchscreen/atmel_mxt_ts.c | 26 +++----------------------- 1 files changed, 3 insertions(+), 23 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index efce50f..87004ec 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -36,6 +36,7 @@ #define MXT_FW_NAME "maxtouch.fw" /* Registers */ +#define MXT_INFO 0x00 #define MXT_FAMILY_ID 0x00 #define MXT_VARIANT_ID 0x01 #define MXT_VERSION 0x02 @@ -758,32 +759,11 @@ static int mxt_get_info(struct mxt_data *data) struct i2c_client *client = data->client; struct mxt_info *info = &data->info; int error; - u8 val; - - error = mxt_read_reg(client, MXT_FAMILY_ID, &val); - if (error) - return error; - info->family_id = val; - - error = mxt_read_reg(client, MXT_VARIANT_ID, &val); - if (error) - return error; - info->variant_id = val; - - error = mxt_read_reg(client, MXT_VERSION, &val); - if (error) - return error; - info->version = val; - - error = mxt_read_reg(client, MXT_BUILD, &val); - if (error) - return error; - info->build = val; - error = mxt_read_reg(client, MXT_OBJECT_NUM, &val); + /* Read 7-byte info block starting at address 0 */ + error = __mxt_read_reg(client, MXT_INFO, sizeof(*info), info); if (error) return error; - info->object_num = val; return 0; } -- 1.7.7.3 -- 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/