From patchwork Mon May 7 06:48:54 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Pasternak X-Patchwork-Id: 10383215 X-Patchwork-Delegate: dvhart@infradead.org 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 A1E086037F for ; Mon, 7 May 2018 04:54:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 960A628978 for ; Mon, 7 May 2018 04:54:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8AB3328985; Mon, 7 May 2018 04:54:12 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY 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 E5CB828978 for ; Mon, 7 May 2018 04:54:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751878AbeEGEx7 (ORCPT ); Mon, 7 May 2018 00:53:59 -0400 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:60839 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750964AbeEGExJ (ORCPT ); Mon, 7 May 2018 00:53:09 -0400 Received: from Internal Mail-Server by MTLPINE1 (envelope-from vadimp@mellanox.com) with ESMTPS (AES256-SHA encrypted); 7 May 2018 07:54:45 +0300 Received: from r-mgtswh-226.mtr.labs.mlnx. (r-mgtswh-226.mtr.labs.mlnx [10.209.1.51]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id w474r2p7013164; Mon, 7 May 2018 07:53:05 +0300 From: Vadim Pasternak To: dvhart@infradead.org, andy.shevchenko@gmail.com, gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, jiri@resnulli.us, michaelsh@mellanox.com, ivecera@redhat.com, Vadim Pasternak Subject: [PATCH v2 6/7] platform/mellanox: Introduce support for Mellanox register access driver Date: Mon, 7 May 2018 06:48:54 +0000 Message-Id: <1525675735-125547-4-git-send-email-vadimp@mellanox.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1525675735-125547-1-git-send-email-vadimp@mellanox.com> References: <1525675735-125547-1-git-send-email-vadimp@mellanox.com> Sender: platform-driver-x86-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce new Mellanox platform driver to allow access to Mellanox programmable device register space trough sysfs interface. The driver purpose is to provide sysfs interface for user space for the registers essential for system control and monitoring. The sets of registers for sysfs access are supposed to be defined per system type bases and include the registers related to system resets operation, system reset causes monitoring and some kinds of mux selection. Signed-off-by: Vadim Pasternak --- v1->v2: Changed added by Vadim: - Change ---help--- to help in Kconfig, according to new requirements; --- drivers/platform/mellanox/Kconfig | 11 ++ drivers/platform/mellanox/Makefile | 1 + drivers/platform/mellanox/mlxreg-io.c | 221 ++++++++++++++++++++++++++++++++++ 3 files changed, 233 insertions(+) create mode 100644 drivers/platform/mellanox/mlxreg-io.c diff --git a/drivers/platform/mellanox/Kconfig b/drivers/platform/mellanox/Kconfig index 591bccd..ddfae9fc 100644 --- a/drivers/platform/mellanox/Kconfig +++ b/drivers/platform/mellanox/Kconfig @@ -23,4 +23,15 @@ config MLXREG_HOTPLUG This driver handles hot-plug events for the power suppliers, power cables and fans on the wide range Mellanox IB and Ethernet systems. +config MLXREG_IO + tristate "Mellanox platform register access driver support" + depends on REGMAP + depends on HWMON + help + This driver allows access to Mellanox programmable device register + space trough sysfs interface. The sets of registers for sysfs access + are defined per system type bases and includes the registers related + to system resets operation, system reset causes monitoring and some + kinds of mux selection. + endif # MELLANOX_PLATFORM diff --git a/drivers/platform/mellanox/Makefile b/drivers/platform/mellanox/Makefile index 7c8385e..57074d9c 100644 --- a/drivers/platform/mellanox/Makefile +++ b/drivers/platform/mellanox/Makefile @@ -4,3 +4,4 @@ # Mellanox Platform-Specific Drivers # obj-$(CONFIG_MLXREG_HOTPLUG) += mlxreg-hotplug.o +obj-$(CONFIG_MLXREG_IO) += mlxreg-io.o diff --git a/drivers/platform/mellanox/mlxreg-io.c b/drivers/platform/mellanox/mlxreg-io.c new file mode 100644 index 0000000..f573b65 --- /dev/null +++ b/drivers/platform/mellanox/mlxreg-io.c @@ -0,0 +1,221 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Mellanox register access driver + * + * Copyright (C) 2018 Mellanox Technologies + * Copyright (C) 2018 Vadim Pasternak + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Attribute parameters. */ +#define MLXREG_IO_ATT_SIZE 10 +#define MLXREG_IO_ATT_NUM 48 + +/** + * struct mlxreg_io_priv_data - driver's private data: + * + * @pdev: platform device; + * @pdata: platform data; + * @hwmon: hwmon device; + * @mlxreg_io_attr: sysfs attributes array; + * @mlxreg_io_dev_attr: sysfs sensor device attribute array; + * @group: sysfs attribute group; + * @groups: list of sysfs attribute group for hwmon registration; + */ +struct mlxreg_io_priv_data { + struct platform_device *pdev; + struct mlxreg_core_platform_data *pdata; + struct device *hwmon; + struct attribute *mlxreg_io_attr[MLXREG_IO_ATT_NUM + 1]; + struct sensor_device_attribute mlxreg_io_dev_attr[MLXREG_IO_ATT_NUM]; + struct attribute_group group; + const struct attribute_group *groups[2]; +}; + +static ssize_t +mlxreg_io_attr_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct mlxreg_io_priv_data *priv = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + struct mlxreg_core_data *data = priv->pdata->data + index; + u32 regval = 0; + int ret; + + ret = regmap_read(priv->pdata->regmap, data->reg, ®val); + if (ret) + goto access_error; + + if (!data->bit) + regval = !!(regval & ~data->mask); + + return sprintf(buf, "%u\n", regval); + +access_error: + return ret; +} + +static ssize_t +mlxreg_io_attr_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + struct mlxreg_io_priv_data *priv = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + struct mlxreg_core_data *data = priv->pdata->data + index; + u32 val, regval; + int ret; + + ret = kstrtou32(buf, MLXREG_IO_ATT_SIZE, &val); + if (ret) + return ret; + + ret = regmap_read(priv->pdata->regmap, data->reg, ®val); + if (ret) + goto access_error; + + regval &= data->mask; + + val = !!val; + if (val) + regval |= ~data->mask; + else + regval &= data->mask; + + ret = regmap_write(priv->pdata->regmap, data->reg, regval); + if (ret) + goto access_error; + + return len; + +access_error: + dev_err(&priv->pdev->dev, "Bus access error\n"); + return ret; +} + +static int mlxreg_io_attr_init(struct mlxreg_io_priv_data *priv) +{ + int i; + + priv->group.attrs = devm_kzalloc(&priv->pdev->dev, + priv->pdata->counter * + sizeof(struct attribute *), + GFP_KERNEL); + if (!priv->group.attrs) + return -ENOMEM; + + for (i = 0; i < priv->pdata->counter; i++) { + priv->mlxreg_io_attr[i] = + &priv->mlxreg_io_dev_attr[i].dev_attr.attr; + + /* Set attribute name as a label. */ + priv->mlxreg_io_attr[i]->name = + devm_kasprintf(&priv->pdev->dev, GFP_KERNEL, + priv->pdata->data[i].label); + + if (!priv->mlxreg_io_attr[i]->name) { + dev_err(&priv->pdev->dev, "Memory allocation failed for sysfs attribute %d.\n", + i + 1); + return -ENOMEM; + } + + priv->mlxreg_io_dev_attr[i].dev_attr.attr.mode = + priv->pdata->data[i].mode; + switch (priv->pdata->data[i].mode) { + case 0200: + priv->mlxreg_io_dev_attr[i].dev_attr.store = + mlxreg_io_attr_store; + break; + + case 0444: + priv->mlxreg_io_dev_attr[i].dev_attr.show = + mlxreg_io_attr_show; + break; + + case 0644: + priv->mlxreg_io_dev_attr[i].dev_attr.show = + mlxreg_io_attr_show; + priv->mlxreg_io_dev_attr[i].dev_attr.store = + mlxreg_io_attr_store; + break; + + default: + dev_err(&priv->pdev->dev, "Bad access mode %u for attribute %s.\n", + priv->pdata->data[i].mode, + priv->mlxreg_io_attr[i]->name); + return -EINVAL; + } + + priv->mlxreg_io_dev_attr[i].dev_attr.attr.name = + priv->mlxreg_io_attr[i]->name; + priv->mlxreg_io_dev_attr[i].index = i; + sysfs_attr_init(&priv->mlxreg_io_dev_attr[i].dev_attr.attr); + } + + priv->group.attrs = priv->mlxreg_io_attr; + priv->groups[0] = &priv->group; + priv->groups[1] = NULL; + + return 0; +} + +static int mlxreg_io_probe(struct platform_device *pdev) +{ + struct mlxreg_io_priv_data *priv; + int err; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->pdata = dev_get_platdata(&pdev->dev); + if (!priv->pdata) { + dev_err(&pdev->dev, "Failed to get platform data.\n"); + return -EINVAL; + } + + priv->pdev = pdev; + + err = mlxreg_io_attr_init(priv); + if (err) { + dev_err(&priv->pdev->dev, "Failed to allocate attributes: %d\n", + err); + return err; + } + + priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev, + "mlxreg_io", + priv, + priv->groups); + if (IS_ERR(priv->hwmon)) { + dev_err(&pdev->dev, "Failed to register hwmon device %ld\n", + PTR_ERR(priv->hwmon)); + return PTR_ERR(priv->hwmon); + } + + dev_set_drvdata(&pdev->dev, priv); + + return 0; +} + +static struct platform_driver mlxreg_io_driver = { + .driver = { + .name = "mlxreg-io", + }, + .probe = mlxreg_io_probe, +}; + +module_platform_driver(mlxreg_io_driver); + +MODULE_AUTHOR("Vadim Pasternak "); +MODULE_DESCRIPTION("Mellanox regmap I/O access driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:mlxreg-io");