From patchwork Fri Jan 22 19:24:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Pasternak X-Patchwork-Id: 368987 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7BBBC433E0 for ; Fri, 22 Jan 2021 22:38:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AB44823A81 for ; Fri, 22 Jan 2021 22:38:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728458AbhAVTs0 (ORCPT ); Fri, 22 Jan 2021 14:48:26 -0500 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:38513 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730487AbhAVTZ4 (ORCPT ); Fri, 22 Jan 2021 14:25:56 -0500 Received: from Internal Mail-Server by MTLPINE1 (envelope-from vadimp@nvidia.com) with SMTP; 22 Jan 2021 21:25:06 +0200 Received: from r-build-lowlevel.mtr.labs.mlnx. (r-build-lowlevel.mtr.labs.mlnx [10.209.0.190]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 10MJP4vA019220; Fri, 22 Jan 2021 21:25:06 +0200 From: Vadim Pasternak To: peda@axentia.se, wsa@the-dreams.de Cc: linux-i2c@vger.kernel.org, Vadim Pasternak Subject: [PATCH i2c-next v2 2/7] platform/x86: mlxcpld: Update module license Date: Fri, 22 Jan 2021 21:24:57 +0200 Message-Id: <20210122192502.17645-3-vadimp@nvidia.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20210122192502.17645-1-vadimp@nvidia.com> References: <20210122192502.17645-1-vadimp@nvidia.com> Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Update license to SPDX-License. Signed-off-by: Vadim Pasternak Acked-by: Peter Rosin --- include/linux/platform_data/x86/mlxcpld.h | 34 +++---------------------------- 1 file changed, 3 insertions(+), 31 deletions(-) diff --git a/include/linux/platform_data/x86/mlxcpld.h b/include/linux/platform_data/x86/mlxcpld.h index b08dcb183fca..e6c18bf017dd 100644 --- a/include/linux/platform_data/x86/mlxcpld.h +++ b/include/linux/platform_data/x86/mlxcpld.h @@ -1,36 +1,8 @@ +/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */ /* - * mlxcpld.h - Mellanox I2C multiplexer support in CPLD + * Mellanox I2C multiplexer support in CPLD * - * Copyright (c) 2016 Mellanox Technologies. All rights reserved. - * Copyright (c) 2016 Michael Shych - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the names of the copyright holders nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * Alternatively, this software may be distributed under the terms of the - * GNU General Public License ("GPL") version 2 as published by the Free - * Software Foundation. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. + * Copyright (C) 2016-2020 Mellanox Technologies */ #ifndef _LINUX_I2C_MLXCPLD_H From patchwork Fri Jan 22 19:24:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Vadim Pasternak X-Patchwork-Id: 368989 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE5D5C43381 for ; Fri, 22 Jan 2021 19:51:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 873FF23AF8 for ; Fri, 22 Jan 2021 19:51:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728583AbhAVTsx (ORCPT ); Fri, 22 Jan 2021 14:48:53 -0500 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:38530 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730532AbhAVT0G (ORCPT ); Fri, 22 Jan 2021 14:26:06 -0500 Received: from Internal Mail-Server by MTLPINE1 (envelope-from vadimp@nvidia.com) with SMTP; 22 Jan 2021 21:25:10 +0200 Received: from r-build-lowlevel.mtr.labs.mlnx. (r-build-lowlevel.mtr.labs.mlnx [10.209.0.190]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 10MJP4vC019220; Fri, 22 Jan 2021 21:25:09 +0200 From: Vadim Pasternak To: peda@axentia.se, wsa@the-dreams.de Cc: linux-i2c@vger.kernel.org, Vadim Pasternak Subject: [PATCH i2c-next v2 4/7] i2c: mux: mlxcpld: Convert driver to platform driver Date: Fri, 22 Jan 2021 21:24:59 +0200 Message-Id: <20210122192502.17645-5-vadimp@nvidia.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20210122192502.17645-1-vadimp@nvidia.com> References: <20210122192502.17645-1-vadimp@nvidia.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Convert driver from 'i2c' to 'platform'. The motivation is to avoid I2C addressing conflict between ‘i2c-mux-cpld’ driver, providing mux selection and deselection through CPLD ‘mux control’ register, and CPLD host driver. The CPLD is I2C device and is multi-functional device performing logic for different components, like LED, ‘hwmon’, interrupt control, watchdog etcetera. For such configuration CPLD should be host I2C device, connected to the relevant I2C bus with the relevant I2C address and all others component drivers are supposed to be its children. The hierarchy in such case will be like in the below example: ls /sys/bus/i2c/devices/44-0032 i2c-mux-mlxcpld.44 leds-mlxreg.44 mlxreg-io.44 ls /sys/bus/i2c/devices/44-0032/i2c-mux-mlxcpld.44 channel-0, …, channel-X Currently this driver is not activated by any kernel driver, so this conversion doesn’t affect any user. Signed-off-by: Vadim Pasternak Reviewed-by: Michael Shych --- v1->v2: Comments pointed out by Peter: - Drop change for last channel setting in mlxcpld_mux_deselect(). --- drivers/i2c/muxes/i2c-mux-mlxcpld.c | 62 +++++++++++++++++-------------------- 1 file changed, 28 insertions(+), 34 deletions(-) diff --git a/drivers/i2c/muxes/i2c-mux-mlxcpld.c b/drivers/i2c/muxes/i2c-mux-mlxcpld.c index 3d894cfb19df..b53f1479272d 100644 --- a/drivers/i2c/muxes/i2c-mux-mlxcpld.c +++ b/drivers/i2c/muxes/i2c-mux-mlxcpld.c @@ -20,10 +20,12 @@ /* mlxcpld_mux - mux control structure: * @last_chan - last register value * @client - I2C device client + * @pdata: platform data */ struct mlxcpld_mux { u8 last_chan; struct i2c_client *client; + struct mlxcpld_mux_plat_data pdata; }; /* MUX logic description. @@ -54,37 +56,30 @@ struct mlxcpld_mux { * */ -static const struct i2c_device_id mlxcpld_mux_id[] = { - { "mlxcpld_mux_module", 0 }, - { } -}; -MODULE_DEVICE_TABLE(i2c, mlxcpld_mux_id); - /* Write to mux register. Don't use i2c_transfer() and i2c_smbus_xfer() * for this as they will try to lock adapter a second time. */ static int mlxcpld_mux_reg_write(struct i2c_adapter *adap, - struct i2c_client *client, u8 val) + struct mlxcpld_mux *mux, u8 val) { - struct mlxcpld_mux_plat_data *pdata = dev_get_platdata(&client->dev); + struct i2c_client *client = mux->client; union i2c_smbus_data data = { .byte = val }; return __i2c_smbus_xfer(adap, client->addr, client->flags, - I2C_SMBUS_WRITE, pdata->sel_reg_addr, + I2C_SMBUS_WRITE, mux->pdata.sel_reg_addr, I2C_SMBUS_BYTE_DATA, &data); } static int mlxcpld_mux_select_chan(struct i2c_mux_core *muxc, u32 chan) { - struct mlxcpld_mux *data = i2c_mux_priv(muxc); - struct i2c_client *client = data->client; + struct mlxcpld_mux *mux = i2c_mux_priv(muxc); u8 regval = chan + 1; int err = 0; /* Only select the channel if its different from the last channel */ - if (data->last_chan != regval) { - err = mlxcpld_mux_reg_write(muxc->parent, client, regval); - data->last_chan = err < 0 ? 0 : regval; + if (mux->last_chan != regval) { + err = mlxcpld_mux_reg_write(muxc->parent, mux, regval); + mux->last_chan = err < 0 ? 0 : regval; } return err; @@ -92,21 +87,19 @@ static int mlxcpld_mux_select_chan(struct i2c_mux_core *muxc, u32 chan) static int mlxcpld_mux_deselect(struct i2c_mux_core *muxc, u32 chan) { - struct mlxcpld_mux *data = i2c_mux_priv(muxc); - struct i2c_client *client = data->client; + struct mlxcpld_mux *mux = i2c_mux_priv(muxc); /* Deselect active channel */ - data->last_chan = 0; + mux->last_chan = 0; - return mlxcpld_mux_reg_write(muxc->parent, client, data->last_chan); + return mlxcpld_mux_reg_write(muxc->parent, mux, mux->last_chan); } /* Probe/reomove functions */ -static int mlxcpld_mux_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int mlxcpld_mux_probe(struct platform_device *pdev) { - struct i2c_adapter *adap = client->adapter; - struct mlxcpld_mux_plat_data *pdata = dev_get_platdata(&client->dev); + struct mlxcpld_mux_plat_data *pdata = dev_get_platdata(&pdev->dev); + struct i2c_client *client = to_i2c_client(pdev->dev.parent); struct i2c_mux_core *muxc; int num, force; struct mlxcpld_mux *data; @@ -115,18 +108,20 @@ static int mlxcpld_mux_probe(struct i2c_client *client, if (!pdata) return -EINVAL; - if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) return -ENODEV; - muxc = i2c_mux_alloc(adap, &client->dev, CPLD_MUX_MAX_NCHANS, + muxc = i2c_mux_alloc(client->adapter, &pdev->dev, CPLD_MUX_MAX_NCHANS, sizeof(*data), 0, mlxcpld_mux_select_chan, mlxcpld_mux_deselect); if (!muxc) return -ENOMEM; + platform_set_drvdata(pdev, muxc); data = i2c_mux_priv(muxc); - i2c_set_clientdata(client, muxc); data->client = client; + memcpy(&data->pdata, pdata, sizeof(*pdata)); data->last_chan = 0; /* force the first selection */ /* Create an adapter for each channel. */ @@ -149,24 +144,23 @@ static int mlxcpld_mux_probe(struct i2c_client *client, return err; } -static int mlxcpld_mux_remove(struct i2c_client *client) +static int mlxcpld_mux_remove(struct platform_device *pdev) { - struct i2c_mux_core *muxc = i2c_get_clientdata(client); + struct i2c_mux_core *muxc = platform_get_drvdata(pdev); i2c_mux_del_adapters(muxc); return 0; } -static struct i2c_driver mlxcpld_mux_driver = { - .driver = { - .name = "mlxcpld-mux", +static struct platform_driver mlxcpld_mux_driver = { + .driver = { + .name = "i2c-mux-mlxcpld", }, - .probe = mlxcpld_mux_probe, - .remove = mlxcpld_mux_remove, - .id_table = mlxcpld_mux_id, + .probe = mlxcpld_mux_probe, + .remove = mlxcpld_mux_remove, }; -module_i2c_driver(mlxcpld_mux_driver); +module_platform_driver(mlxcpld_mux_driver); MODULE_AUTHOR("Michael Shych (michaels@mellanox.com)"); MODULE_DESCRIPTION("Mellanox I2C-CPLD-MUX driver"); From patchwork Fri Jan 22 19:25:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Pasternak X-Patchwork-Id: 368988 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DC739C4332E for ; Fri, 22 Jan 2021 19:51:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BD40023B06 for ; Fri, 22 Jan 2021 19:51:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728684AbhAVTtM (ORCPT ); Fri, 22 Jan 2021 14:49:12 -0500 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:38532 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730534AbhAVT0G (ORCPT ); Fri, 22 Jan 2021 14:26:06 -0500 Received: from Internal Mail-Server by MTLPINE1 (envelope-from vadimp@nvidia.com) with SMTP; 22 Jan 2021 21:25:11 +0200 Received: from r-build-lowlevel.mtr.labs.mlnx. (r-build-lowlevel.mtr.labs.mlnx [10.209.0.190]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 10MJP4vD019220; Fri, 22 Jan 2021 21:25:11 +0200 From: Vadim Pasternak To: peda@axentia.se, wsa@the-dreams.de Cc: linux-i2c@vger.kernel.org, Vadim Pasternak Subject: [PATCH i2c-next v2 5/7] i2c: mux: mlxcpld: Extend driver to support word address space devices Date: Fri, 22 Jan 2021 21:25:00 +0200 Message-Id: <20210122192502.17645-6-vadimp@nvidia.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20210122192502.17645-1-vadimp@nvidia.com> References: <20210122192502.17645-1-vadimp@nvidia.com> Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Extend driver to allow I2C routing control through CPLD devices with word address space. Till now only CPLD devices with byte address space have been supported. Signed-off-by: Vadim Pasternak Reviewed-by: Michael Shych --- v1->v2: Comments pointed out by Peter: - Remove data buffer allocation from 'mlxcpld_mux' structure, do it on stack instead. - Do not use array pdata.adap_ids[] in mlxcpld_mux_reg_write() for channel assignment. - Return back 'regval' variable, used for channel assignment in mlxcpld_mux_select_chan(). - Fix functionality validation in mlxcpld_mux_probe(). - Fix comment for 'reg_size' field in mlxcpld_mux_plat_data' structure. Added by Vadim: - Change type of register select address to '__be16' to align with type in assignment in cpu_to_be16(). --- drivers/i2c/muxes/i2c-mux-mlxcpld.c | 54 ++++++++++++++++++++++++++++------- include/linux/platform_data/mlxcpld.h | 2 ++ 2 files changed, 46 insertions(+), 10 deletions(-) diff --git a/drivers/i2c/muxes/i2c-mux-mlxcpld.c b/drivers/i2c/muxes/i2c-mux-mlxcpld.c index b53f1479272d..4848dd4ff41a 100644 --- a/drivers/i2c/muxes/i2c-mux-mlxcpld.c +++ b/drivers/i2c/muxes/i2c-mux-mlxcpld.c @@ -21,11 +21,13 @@ * @last_chan - last register value * @client - I2C device client * @pdata: platform data + * @sel_reg_addr: mux select/deselect register address */ struct mlxcpld_mux { u8 last_chan; struct i2c_client *client; struct mlxcpld_mux_plat_data pdata; + __be16 sel_reg_addr; }; /* MUX logic description. @@ -60,24 +62,43 @@ struct mlxcpld_mux { * for this as they will try to lock adapter a second time. */ static int mlxcpld_mux_reg_write(struct i2c_adapter *adap, - struct mlxcpld_mux *mux, u8 val) + struct mlxcpld_mux *mux, int chan) { struct i2c_client *client = mux->client; - union i2c_smbus_data data = { .byte = val }; - - return __i2c_smbus_xfer(adap, client->addr, client->flags, - I2C_SMBUS_WRITE, mux->pdata.sel_reg_addr, - I2C_SMBUS_BYTE_DATA, &data); + union i2c_smbus_data data; + struct i2c_msg msg; + u8 buf[3]; + + switch (mux->pdata.reg_size) { + case 1: + data.byte = (chan < 0) ? 0 : chan; + return __i2c_smbus_xfer(adap, client->addr, client->flags, + I2C_SMBUS_WRITE, mux->pdata.sel_reg_addr, + I2C_SMBUS_BYTE_DATA, &data); + case 2: + memcpy(buf, &mux->sel_reg_addr, 2); + buf[2] = chan; + msg.addr = client->addr; + msg.buf = buf; + msg.len = mux->pdata.reg_size + 1; + msg.flags = 0; + return __i2c_transfer(adap, &msg, 1); + default: + return -EINVAL; + } } static int mlxcpld_mux_select_chan(struct i2c_mux_core *muxc, u32 chan) { struct mlxcpld_mux *mux = i2c_mux_priv(muxc); - u8 regval = chan + 1; + u8 regval = chan; int err = 0; + if (mux->pdata.reg_size == 1) + regval += 1; + /* Only select the channel if its different from the last channel */ - if (mux->last_chan != regval) { + if (mux->last_chan != chan) { err = mlxcpld_mux_reg_write(muxc->parent, mux, regval); mux->last_chan = err < 0 ? 0 : regval; } @@ -103,13 +124,24 @@ static int mlxcpld_mux_probe(struct platform_device *pdev) struct i2c_mux_core *muxc; int num, force; struct mlxcpld_mux *data; + u32 func; int err; if (!pdata) return -EINVAL; - if (!i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) + switch (pdata->reg_size) { + case 1: + func = I2C_FUNC_SMBUS_WRITE_BYTE_DATA; + break; + case 2: + func = I2C_FUNC_I2C; + break; + default: + return -EINVAL; + } + + if (!i2c_check_functionality(client->adapter, func)) return -ENODEV; muxc = i2c_mux_alloc(client->adapter, &pdev->dev, CPLD_MUX_MAX_NCHANS, @@ -122,6 +154,8 @@ static int mlxcpld_mux_probe(struct platform_device *pdev) data = i2c_mux_priv(muxc); data->client = client; memcpy(&data->pdata, pdata, sizeof(*pdata)); + /* Save mux select address for 16 bits transaction size. */ + data->sel_reg_addr = cpu_to_be16(pdata->sel_reg_addr); data->last_chan = 0; /* force the first selection */ /* Create an adapter for each channel. */ diff --git a/include/linux/platform_data/mlxcpld.h b/include/linux/platform_data/mlxcpld.h index e6c18bf017dd..9cb2c3d8293e 100644 --- a/include/linux/platform_data/mlxcpld.h +++ b/include/linux/platform_data/mlxcpld.h @@ -14,11 +14,13 @@ * @adap_ids - adapter array * @num_adaps - number of adapters * @sel_reg_addr - mux select register offset in CPLD space + * @reg_size: register size in bytes */ struct mlxcpld_mux_plat_data { int *adap_ids; int num_adaps; int sel_reg_addr; + u8 reg_size; }; #endif /* _LINUX_I2C_MLXCPLD_H */