From patchwork Mon Apr 28 14:27:44 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "lan,Tianyu" X-Patchwork-Id: 4078511 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 6E49A9F4F4 for ; Mon, 28 Apr 2014 14:28:02 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9A87320304 for ; Mon, 28 Apr 2014 14:28:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BE3EC20375 for ; Mon, 28 Apr 2014 14:28:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932459AbaD1O1v (ORCPT ); Mon, 28 Apr 2014 10:27:51 -0400 Received: from mga01.intel.com ([192.55.52.88]:41348 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932456AbaD1O1u (ORCPT ); Mon, 28 Apr 2014 10:27:50 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 28 Apr 2014 07:27:49 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,944,1389772800"; d="scan'208";a="529859202" Received: from unknown (HELO localhost) ([10.255.20.81]) by fmsmga002.fm.intel.com with ESMTP; 28 Apr 2014 07:27:45 -0700 From: Lan Tianyu To: wsa@the-dreams.de, rjw@rjwysocki.net, mika.westerberg@linux.intel.com, awilliam@redhat.com, lenb@kernel.org Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, tianyu.lan@intel.com Subject: [Patch V2 5/9] I2C: Add smbus quick read/write helper function Date: Mon, 28 Apr 2014 22:27:44 +0800 Message-Id: <1398695268-28645-6-git-send-email-tianyu.lan@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1398695268-28645-1-git-send-email-tianyu.lan@intel.com> References: <1398147855-9868-1-git-send-email-tianyu.lan@intel.com> <1398695268-28645-1-git-send-email-tianyu.lan@intel.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add i2c_smbus_quick_write/read() helper function. These will be used in the implementation of i2c ACPI address space handler. Reviewed-by: Mika Westerberg Signed-off-by: Lan Tianyu --- drivers/i2c/i2c-core.c | 30 ++++++++++++++++++++++++++++++ include/linux/i2c.h | 2 ++ 2 files changed, 32 insertions(+) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 7c7f4b8..3bf0048 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -2162,6 +2162,36 @@ static int i2c_smbus_check_pec(u8 cpec, struct i2c_msg *msg) } /** + * i2c_smbus_quick_write - SMBus "quick write" protocol + * @client: Handle to slave device + * + * This executes the SMBus "quick write" protocol, returning negative errno + * else zero on success. + */ +s32 i2c_smbus_quick_write(const struct i2c_client *client) +{ + return i2c_smbus_xfer(client->adapter, client->addr, client->flags, + I2C_SMBUS_WRITE, 0, + I2C_SMBUS_QUICK, NULL); +} +EXPORT_SYMBOL_GPL(i2c_smbus_quick_write); + +/** + * i2c_smbus_quick_read - SMBus "quick read" protocol + * @client: Handle to slave device + * + * This executes the SMBus "quick read" protocol, returning negative errno + * else zero on success. + */ +s32 i2c_smbus_quick_read(const struct i2c_client *client) +{ + return i2c_smbus_xfer(client->adapter, client->addr, client->flags, + I2C_SMBUS_READ, 0, + I2C_SMBUS_QUICK, NULL); +} +EXPORT_SYMBOL_GPL(i2c_smbus_quick_read); + +/** * i2c_smbus_read_byte - SMBus "receive byte" protocol * @client: Handle to slave device * diff --git a/include/linux/i2c.h b/include/linux/i2c.h index b556e0a..3e6ea90 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -82,6 +82,8 @@ extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, /* Now follow the 'nice' access routines. These also document the calling conventions of i2c_smbus_xfer. */ +extern s32 i2c_smbus_quick_write(const struct i2c_client *client); +extern s32 i2c_smbus_quick_read(const struct i2c_client *client); extern s32 i2c_smbus_read_byte(const struct i2c_client *client); extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value); extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client,