From patchwork Sat Nov 4 20:20:04 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 10041705 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id BC03A6032D for ; Sat, 4 Nov 2017 20:21:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ABCAC29710 for ; Sat, 4 Nov 2017 20:21:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9D1D029639; Sat, 4 Nov 2017 20:21:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0513729639 for ; Sat, 4 Nov 2017 20:21:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752576AbdKDUUc (ORCPT ); Sat, 4 Nov 2017 16:20:32 -0400 Received: from sauhun.de ([88.99.104.3]:44807 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751709AbdKDUUZ (ORCPT ); Sat, 4 Nov 2017 16:20:25 -0400 Received: from localhost (p54B33782.dip0.t-ipconnect.de [84.179.55.130]) by pokefinder.org (Postfix) with ESMTPSA id 6F7BF2C35B3; Sat, 4 Nov 2017 21:20:23 +0100 (CET) From: Wolfram Sang To: linux-i2c@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-iio@vger.kernel.org, linux-input@vger.kernel.org, linux-media@vger.kernel.org, Mark Brown , Wolfram Sang Subject: [PATCH v6 4/9] i2c: refactor i2c_master_{send_recv} Date: Sat, 4 Nov 2017 21:20:04 +0100 Message-Id: <20171104202009.3818-5-wsa+renesas@sang-engineering.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171104202009.3818-1-wsa+renesas@sang-engineering.com> References: <20171104202009.3818-1-wsa+renesas@sang-engineering.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Those two functions are very similar, the only differences are that one needs the I2C_M_RD flag for its message while the other one needs the buffer casted to drop the const. Introduce a generic helper which allows to specify the flags (also needed later for DMA safe variants of these calls) and let the casting be done in the inlining fuctions which are now calling the new helper function. Signed-off-by: Wolfram Sang Reviewed-by: Jonathan Cameron --- drivers/i2c/i2c-core-base.c | 64 +++++++++++++-------------------------------- include/linux/i2c.h | 34 +++++++++++++++++++++--- 2 files changed, 48 insertions(+), 50 deletions(-) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index de1850bd440659..206c47c85c98c5 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -1972,63 +1972,35 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) EXPORT_SYMBOL(i2c_transfer); /** - * i2c_master_send - issue a single I2C message in master transmit mode + * i2c_transfer_buffer_flags - issue a single I2C message transferring data + * to/from a buffer * @client: Handle to slave device - * @buf: Data that will be written to the slave - * @count: How many bytes to write, must be less than 64k since msg.len is u16 + * @buf: Where the data is stored + * @count: How many bytes to transfer, must be less than 64k since msg.len is u16 + * @flags: The flags to be used for the message, e.g. I2C_M_RD for reads * - * Returns negative errno, or else the number of bytes written. + * Returns negative errno, or else the number of bytes transferred. */ -int i2c_master_send(const struct i2c_client *client, const char *buf, int count) +int i2c_transfer_buffer_flags(const struct i2c_client *client, char *buf, + int count, u16 flags) { int ret; - struct i2c_adapter *adap = client->adapter; - struct i2c_msg msg; - - msg.addr = client->addr; - msg.flags = client->flags & I2C_M_TEN; - msg.len = count; - msg.buf = (char *)buf; - - ret = i2c_transfer(adap, &msg, 1); - - /* - * If everything went ok (i.e. 1 msg transmitted), return #bytes - * transmitted, else error code. - */ - return (ret == 1) ? count : ret; -} -EXPORT_SYMBOL(i2c_master_send); - -/** - * i2c_master_recv - issue a single I2C message in master receive mode - * @client: Handle to slave device - * @buf: Where to store data read from slave - * @count: How many bytes to read, must be less than 64k since msg.len is u16 - * - * Returns negative errno, or else the number of bytes read. - */ -int i2c_master_recv(const struct i2c_client *client, char *buf, int count) -{ - struct i2c_adapter *adap = client->adapter; - struct i2c_msg msg; - int ret; - - msg.addr = client->addr; - msg.flags = client->flags & I2C_M_TEN; - msg.flags |= I2C_M_RD; - msg.len = count; - msg.buf = buf; + struct i2c_msg msg = { + .addr = client->addr, + .flags = flags | (client->flags & I2C_M_TEN), + .len = count, + .buf = buf, + }; - ret = i2c_transfer(adap, &msg, 1); + ret = i2c_transfer(client->adapter, &msg, 1); /* - * If everything went ok (i.e. 1 msg received), return #bytes received, - * else error code. + * If everything went ok (i.e. 1 msg transferred), return #bytes + * transferred, else error code. */ return (ret == 1) ? count : ret; } -EXPORT_SYMBOL(i2c_master_recv); +EXPORT_SYMBOL(i2c_transfer_buffer_flags); /* ---------------------------------------------------- * the i2c address scanning function diff --git a/include/linux/i2c.h b/include/linux/i2c.h index a0b57de91e21d3..ef1a8791c1ae24 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -63,10 +63,36 @@ struct property_entry; * transmit an arbitrary number of messages without interruption. * @count must be be less than 64k since msg.len is u16. */ -extern int i2c_master_send(const struct i2c_client *client, const char *buf, - int count); -extern int i2c_master_recv(const struct i2c_client *client, char *buf, - int count); +extern int i2c_transfer_buffer_flags(const struct i2c_client *client, + char *buf, int count, u16 flags); + +/** + * i2c_master_recv - issue a single I2C message in master receive mode + * @client: Handle to slave device + * @buf: Where to store data read from slave + * @count: How many bytes to read, must be less than 64k since msg.len is u16 + * + * Returns negative errno, or else the number of bytes read. + */ +static inline int i2c_master_recv(const struct i2c_client *client, + char *buf, int count) +{ + return i2c_transfer_buffer_flags(client, buf, count, I2C_M_RD); +}; + +/** + * i2c_master_send - issue a single I2C message in master transmit mode + * @client: Handle to slave device + * @buf: Data that will be written to the slave + * @count: How many bytes to write, must be less than 64k since msg.len is u16 + * + * Returns negative errno, or else the number of bytes written. + */ +static inline int i2c_master_send(const struct i2c_client *client, + const char *buf, int count) +{ + return i2c_transfer_buffer_flags(client, (char *)buf, count, 0); +}; /* Transfer num messages. */