Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161201AbaDPN0d (ORCPT ); Wed, 16 Apr 2014 09:26:33 -0400 Received: from mga11.intel.com ([192.55.52.93]:17985 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161169AbaDPN0b (ORCPT ); Wed, 16 Apr 2014 09:26:31 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,872,1389772800"; d="scan'208";a="521624861" From: Lan Tianyu To: wsa@the-dreams.de, rjw@rjwysocki.net, lenb@kernel.org, mika.westerberg@linux.intel.com, awilliam@redhat.com, tianyu.lan@intel.com Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/9] I2C: Add smbus quick read/write helper function Date: Wed, 16 Apr 2014 21:24:38 +0800 Message-Id: <1397654682-7094-6-git-send-email-tianyu.lan@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1397654682-7094-1-git-send-email-tianyu.lan@intel.com> References: <1397654682-7094-1-git-send-email-tianyu.lan@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add i2c_smbus_quick_write/read() helper function. These will be used in the implementation of i2c ACPI address space handler. 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, -- 1.8.4.rc0.1.g8f6a3e5.dirty -- 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/