From patchwork Thu Jul 30 14:31:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Divya Bharathi X-Patchwork-Id: 11693231 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1B9E514DD for ; Thu, 30 Jul 2020 14:31:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C21DB20663 for ; Thu, 30 Jul 2020 14:31:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ANh5th2H" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729612AbgG3Obl (ORCPT ); Thu, 30 Jul 2020 10:31:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729578AbgG3Obj (ORCPT ); Thu, 30 Jul 2020 10:31:39 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9E494C061574; Thu, 30 Jul 2020 07:31:39 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id o1so14311302plk.1; Thu, 30 Jul 2020 07:31:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=oOeWXLH96UcBXsUsbBvnZHp5tLOrp7FWYQ+5QTigfUw=; b=ANh5th2Hj8WeIjYZhsswBIa8FT8dZb/0ACqB7/xfoOiif4mQ1kJeY7VyVyU1Rlug10 dPYz5jUdJ8vU+0ew7VvYIXedVorIYJspT4aArasM1e9NTm/j3mnfuPyANHicOD1vP3sP kVtO+6+Kx41cBfJ6sf/rZbWRbWsxV/SvtJj5R8QhKImxZxv2NJexwfrqUFboWKD+1jDz 9RFs2ZwbOf0cFYzTsJoa+4MeJx0eDJbC6GXRcNc/UzV83ho4xcN1Yy5+c73nWVMP3GZU da3vfEHFFh9WEJUWOuY+GSiJ2BhsTIYezvl4GlazKdPFIySOUY/EINJvU5iWwODePQIo hpLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=oOeWXLH96UcBXsUsbBvnZHp5tLOrp7FWYQ+5QTigfUw=; b=VeugExzg67gWMUXWFQ794vZ84kdVD/ZVsKGb9ntDhGXRXsDgd7VSh7jmYZGZ6U3fVa 9bo+DBb8Rv+6plrVFGcTlK/xr347Hq4NZlk3wzinC65cf96i6LgqHKA3ENJIbdmzhh/X zDwdJMCJSuAqa29YP7INBu4klD9/a4xBQVySKDCAvuswA3NiA5tzh6QND8stpMZpokUG gqKNYo6gKWUPX6wjozeriNtDOkbUiqB9YrKtzD2x7WIWs2nVOFYuEb44MwsqhwszKsXn SSZQfhkpVnfINeznufwkb4+GiRKR18XZZR47z1erwONcq8G2y0raq3+dXhexhXG5TIqg YR0A== X-Gm-Message-State: AOAM5330v07yi2D7o3c2T7hYE/eiRh1mWkkSOCtwMjXp/C2hvSDiIbOZ BsOc0bvfRHFLoY6FXGO6Qkg= X-Google-Smtp-Source: ABdhPJxCrUx3YmYy7wfjZY5um7Sx4bhNQjZ699xnnE2xsubXfTkxLQv2mHDem8LX8C62eSb6iAyGMg== X-Received: by 2002:a17:90a:ff0e:: with SMTP id ce14mr3697950pjb.128.1596119498574; Thu, 30 Jul 2020 07:31:38 -0700 (PDT) Received: from localhost.localdomain ([27.59.20.191]) by smtp.googlemail.com with ESMTPSA id t17sm6509948pgu.30.2020.07.30.07.31.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jul 2020 07:31:37 -0700 (PDT) From: Divya Bharathi X-Google-Original-From: Divya Bharathi To: dvhart@infradead.org Cc: LKML , platform-driver-x86@vger.kernel.org, Divya Bharathi , Mario Limonciello , Prasanth KSR Subject: [PATCH] Introduce support for Systems Management Driver over WMI for Dell Systems Date: Thu, 30 Jul 2020 20:01:22 +0530 Message-Id: <20200730143122.10237-1-divya_bharathi@dell.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Sender: platform-driver-x86-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org From: Divya Bharathi The Dell WMI Systems Management Driver provides a sysfs interface for systems management to enable BIOS configuration capability on certain Dell Systems. This driver allows user to configure Dell systems with a uniform common interface. To facilitate this, the patch introduces a generic way for driver to be able to create configurable BIOS Attributes available in Setup (F2) screen. Co-developed-by: Mario Limonciello Signed-off-by: Mario Limonciello Co-developed-by: Prasanth KSR Signed-off-by: Prasanth KSR Signed-off-by: Divya Bharathi --- NOTE: This patch series is intended to go on top of platform-drivers-x86 linux-next. .../testing/sysfs-platform-dell-wmi-sysman | 201 ++++++ MAINTAINERS | 9 + drivers/platform/x86/Kconfig | 11 + drivers/platform/x86/Makefile | 8 + .../x86/dell-wmi-biosattr-interface.c | 263 ++++++++ .../platform/x86/dell-wmi-enum-attributes.c | 207 +++++++ .../platform/x86/dell-wmi-int-attributes.c | 188 ++++++ .../x86/dell-wmi-passobj-attributes.c | 161 +++++ .../x86/dell-wmi-passwordattr-interface.c | 230 +++++++ .../platform/x86/dell-wmi-string-attributes.c | 170 ++++++ .../platform/x86/dell-wmi-sysman-attributes.c | 575 ++++++++++++++++++ .../platform/x86/dell-wmi-sysman-attributes.h | 125 ++++ 12 files changed, 2148 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-platform-dell-wmi-sysman create mode 100644 drivers/platform/x86/dell-wmi-biosattr-interface.c create mode 100644 drivers/platform/x86/dell-wmi-enum-attributes.c create mode 100644 drivers/platform/x86/dell-wmi-int-attributes.c create mode 100644 drivers/platform/x86/dell-wmi-passobj-attributes.c create mode 100644 drivers/platform/x86/dell-wmi-passwordattr-interface.c create mode 100644 drivers/platform/x86/dell-wmi-string-attributes.c create mode 100644 drivers/platform/x86/dell-wmi-sysman-attributes.c create mode 100644 drivers/platform/x86/dell-wmi-sysman-attributes.h diff --git a/Documentation/ABI/testing/sysfs-platform-dell-wmi-sysman b/Documentation/ABI/testing/sysfs-platform-dell-wmi-sysman new file mode 100644 index 000000000000..8ca3e502ed89 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-dell-wmi-sysman @@ -0,0 +1,201 @@ +What: /sys/devices/platform/dell-wmi-sysman/attributes/ +Date: October 2020 +KernelVersion: 5.9 +Contact: Divya Bharathi , + Mario Limonciello , + Prasanth KSR +Description: + The Dell WMI Systems Management Driver provides a sysfs interface + for systems management software to enable BIOS configuration + capability on certain Dell systems. This directory exposes + interfaces for interacting with BIOS attributes + +What: /sys/devices/platform/dell-wmi-sysman/attributes/reset_bios +Date: October 2020 +KernelVersion: 5.9 +Contact: Divya Bharathi , + Mario Limonciello , + Prasanth KSR +Description: + This attribute can be used to reset the BIOS Configuration. + Specifically, it tells which type of reset BIOS configuration is being + requested on the host. + + Reading from it returns a list of supported options encoded as: + + 'builtinsafe' (Built in safe configuration profile) + 'lastknowngood' (Last known good saved configuration profile) + 'factory' (Default factory settings configuration profile) + 'custom' (Custom saved configuration profile) + + The currently selected option is printed in square brackets as + shown below: + + # echo "factory" > sys/devices/platform/dell-wmi-sysman/attributes/reset_bios + + # cat sys/devices/platform/dell-wmi-sysman/attributes/reset_bios + # builtinsafe lastknowngood [factory] custom + + Note that any changes to this attribute requires a reboot + for changes to take effect. + +What: /sys/devices/platform/dell-wmi-sysman/attributes/pending_reboot +Date: October 2020 +KernelVersion: 5.9 +Contact: Divya Bharathi , + Mario Limonciello , + Prasanth KSR +Description: + A read-only attribute enumerating if a reboot is pending + on any BIOS attribute change. + + 0: No pending reboot + 1: Pending reboot + +What: /sys/devices/platform/dell-wmi-sysman/attributes/enumeration// +Date: October 2020 +KernelVersion: 5.9 +Contact: Divya Bharathi , + Mario Limonciello , + Prasanth KSR +Description: + This directory exposes interfaces for interaction with + BIOS enumeration attributes. + + Enumeration attributes are settings that accept set of + pre-defined valid values. + + current_value: A file that can be read to obtain the current + value of the + + This file can also be written to in order to update + the value of a + + default_value: A file that can be read to obtain the default + value of the + + display_name: A file that can be read to obtain a user friendly + description of the at + + display_name_language_code: A file that can be read to obtain + the language code corresponding to the "display_name" of the + + modifier: A file that can be read to obtain attribute-level + dependency rule which has to be met to configure + + possible_value: A file that can be read to obtain the possible + value of the + + value_modifier: A file that can be read to obtain value-level + dependency on a possible value which has to be met to configure + +What: /sys/devices/platform/dell-wmi-sysman/attributes/integer// +Date: October 2020 +KernelVersion: 5.9 +Contact: Divya Bharathi , + Mario Limonciello , + Prasanth KSR +Description: + This directory exposes interfaces for interaction with + BIOS integer attributes. + + Integer attributes are settings that accept a range of + numerical values for inputs. Each BIOS integer has a + lower bound and an upper bound on the values that it can take. + + current_value: A file that can be read to obtain the current + value of the + + This file can also be written to in order to update + the value of an . + + default_value: A file that can be read to obtain the default + value of the + + display_name: A file that can be read to obtain a user friendly + description of the at + + display_name_language_code: A file that can be read to obtain + the language code corresponding to the "display_name" of the + + lower_bound: A file that can be read to obtain the lower + bound value of the + + modifier: A file that can be read to obtain attribute-level + dependency rule which has to be met to configure + + scalar_increment: A file that can be read to obtain the + resolution of the incremental value this attribute accepts. + + upper_bound: A file that can be read to obtain the upper + bound value of the + +What: /sys/devices/platform/dell-wmi-sysman/attributes/string// +Date: October 2020 +KernelVersion: 5.9 +Contact: Divya Bharathi , + Mario Limonciello , + Prasanth KSR +Description: + This directory exposes interfaces for interaction with + BIOS string attributes. + + String attributes are settings that accept a string for an input. + Each BIOS string is characterized by the minimum length of the string, + the maximum length of the string, and the type of the string. + + current_value: A file that can be read to obtain the current + value of the + + This file can also be written to in order to update + the value of an . + + default_value: A file that can be read to obtain the default + value of the + + display_name: A file that can be read to obtain a user friendly + description of the at + + display_name_language_code: A file that can be read to obtain + the language code corresponding to the "display_name" of the + + max_length: A file that can be read to obtain the maximum + length value of the + + min_length: A file that can be read to obtain the minimum + length value of the + + modifier: A file that can be read to obtain attribute-level + dependency rule which has to be met to configure + +What: /sys/devices/platform/dell-wmi-sysman/attributes/password// +Date: October 2020 +KernelVersion: 5.9 +Contact: Divya Bharathi , + Mario Limonciello , + Prasanth KSR +Description: + This directory exposes interfaces for interaction with + BIOS password attributes. + + BIOS Admin password and System Password can be set, reset or cleared + using these attributes. + + An "Admin" password is used for preventing modification to the BIOS settings. + A "System" password is required to boot a machine. + + is_password_set: A file that can be read + to obtain flag to see if a password is set on + + max_password_length: A file that can be read to obtain the + maximum length of the Password + + min_password_length: A file that can be read to obtain the + minimum length of the Password + + current_password: A write only value used for privileged access + such as setting attributes when a system or admin password is set + or resetting to a new password + + new_password: A write only value that when used in tandem with + current_password will reset a system or admin password. diff --git a/MAINTAINERS b/MAINTAINERS index e64cdde81851..176311d712db 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4879,6 +4879,15 @@ M: Mario Limonciello S: Maintained F: drivers/platform/x86/dell-wmi-descriptor.c +DELL WMI SYSMAN DRIVER +M: Divya Bharathi +M: Mario Limonciello +M: Prasanth Ksr +L: platform-driver-x86@vger.kernel.org +S: Maintained +F: drivers/platform/x86/dell-wmi-*-attributes.* +F: drivers/platform/x86/dell-wmi-*-interface.c + DELL WMI NOTIFICATIONS DRIVER M: Matthew Garrett M: Pali Rohár diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 0581a54cf562..de66373554c2 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -430,6 +430,17 @@ config DELL_WMI To compile this driver as a module, choose M here: the module will be called dell-wmi. +config DELL_WMI_SYSMAN + tristate "Dell WMI SYSMAN" + depends on ACPI_WMI + depends on DMI + help + This driver allows changing BIOS settings on many Dell machines from + 2018 and newer without the use of any additional software. + + To compile this driver as a module, choose M here: the module will + be called dell-wmi-sysman. + config DELL_WMI_DESCRIPTOR tristate depends on ACPI_WMI diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 2b85852a1a87..bee03f1af28f 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -47,6 +47,14 @@ obj-$(CONFIG_DELL_WMI) += dell-wmi.o obj-$(CONFIG_DELL_WMI_DESCRIPTOR) += dell-wmi-descriptor.o obj-$(CONFIG_DELL_WMI_AIO) += dell-wmi-aio.o obj-$(CONFIG_DELL_WMI_LED) += dell-wmi-led.o +obj-$(CONFIG_DELL_WMI_SYSMAN) += dell-wmi-sysman.o +dell-wmi-sysman-objs := dell-wmi-sysman-attributes.o \ + dell-wmi-enum-attributes.o \ + dell-wmi-int-attributes.o \ + dell-wmi-string-attributes.o \ + dell-wmi-passobj-attributes.o \ + dell-wmi-passwordattr-interface.o \ + dell-wmi-biosattr-interface.o # Fujitsu obj-$(CONFIG_AMILO_RFKILL) += amilo-rfkill.o diff --git a/drivers/platform/x86/dell-wmi-biosattr-interface.c b/drivers/platform/x86/dell-wmi-biosattr-interface.c new file mode 100644 index 000000000000..decf124d4388 --- /dev/null +++ b/drivers/platform/x86/dell-wmi-biosattr-interface.c @@ -0,0 +1,263 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to SET methods under BIOS attributes interface GUID for use + * with dell-wmi-sysman + * + * Copyright (c) 2020 Dell Inc. + */ + +#include +#include "dell-wmi-sysman-attributes.h" + +#define SETDEFAULTVALUES_METHOD_ID 0x02 +#define SETBIOSDEFAULTS_METHOD_ID 0x03 +#define SETATTRIBUTE_METHOD_ID 0x04 + +static DEFINE_MUTEX(call_mutex); +static DEFINE_MUTEX(list_mutex); + +struct wmi_interface_priv { + struct list_head list; + struct wmi_device *wdev; + struct device *child; + bool pending_changes; +}; +static LIST_HEAD(interface_list); + +static inline struct wmi_interface_priv *get_first_interface_priv(void) +{ + return list_first_entry_or_null(&interface_list, + struct wmi_interface_priv, + list); +} + +static int call_biosattributes_interface(struct wmi_device *wdev, char *in_args, size_t size, + int method_id) +{ + struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; + struct acpi_buffer input; + union acpi_object *obj; + acpi_status status; + int ret = -EIO; + + input.length = (acpi_size) size; + input.pointer = in_args; + status = wmidev_evaluate_method(wdev, 0, method_id, &input, &output); + if (ACPI_FAILURE(status)) + return -EIO; + obj = (union acpi_object *)output.pointer; + if (obj->type == ACPI_TYPE_INTEGER) + ret = obj->integer.value; + + kfree(output.pointer); + kobject_uevent(&wdev->dev.kobj, KOBJ_CHANGE); + return map_wmi_error(ret); +} + +/** + * get_pending_changes() - Fetch if any changes are pending + * + * Checks if any changes have been written that will be changed + * after a system reboot + **/ +bool get_pending_changes(void) +{ + struct wmi_interface_priv *priv; + + priv = get_first_interface_priv(); + if (priv) + return priv->pending_changes; + return 0; +} + +/** + * set_attribute() - Update an attribute value + * @a_name: The attribute name + * @a_value: The attribute value + * + * Sets an attribute to new value + **/ +int set_attribute(const char *a_name, const char *a_value) +{ + int ret = -1; + int i; + u8 *name_len, *value_len; + char *current_password, *attribute_name, *attribute_value; + size_t security_area_size; + size_t string_area_size; + size_t buffer_size; + struct wmi_interface_priv *priv; + char *buffer; + + /* look up if user set a password for the requests */ + current_password = get_current_password("Admin"); + if (!current_password) + return -ENODEV; + + /* password is set */ + if (strlen(current_password) > 0) + security_area_size = (sizeof(u32) * 2) + strlen(current_password) + + strlen(current_password) % 2; + /* password not set */ + else + security_area_size = sizeof(u32) * 2; + string_area_size = (strlen(a_name) + strlen(a_value))*2; + buffer_size = security_area_size + string_area_size + sizeof(u16) * 2; + + buffer = kzalloc(buffer_size, GFP_KERNEL); + if (!buffer) + return -ENOMEM; + + /* build security area */ + if (strlen(current_password) > 0) + populate_security_buffer(buffer, current_password); + + name_len = buffer + security_area_size; + attribute_name = name_len + sizeof(u16); + value_len = attribute_name + strlen(a_name)*2; + attribute_value = value_len + sizeof(u16); + + /* turn into UTF16 strings, no NULL terminator */ + *name_len = strlen(a_name)*2; + *value_len = strlen(a_value)*2; + for (i = 0; i < strlen(a_name); i++) + attribute_name[i*2] = a_name[i]; + for (i = 0; i < strlen(a_value); i++) + attribute_value[i*2] = a_value[i]; + + mutex_lock(&call_mutex); + priv = get_first_interface_priv(); + if (!priv) { + ret = -ENODEV; + pr_err(DRIVER_NAME ": no WMI backend bound"); + goto out_set_attribute; + } + + ret = call_biosattributes_interface(priv->wdev, buffer, buffer_size, + SETATTRIBUTE_METHOD_ID); + if (ret == -EOPNOTSUPP) + dev_err(&priv->wdev->dev, "admin password must be configured"); + else if (ret == -EACCES) + dev_err(&priv->wdev->dev, "invalid password"); + + priv->pending_changes = 1; +out_set_attribute: + kfree(buffer); + mutex_unlock(&call_mutex); + + return ret; +} + +/** + * set_bios_defaults() - Resets BIOS defaults + * @deftype: the type of BIOS value reset to issue. + * + * Resets BIOS defaults + **/ +int set_bios_defaults(u8 deftype) +{ + int ret = -1; + u8 *defaultType; + char *current_password, *buffer; + size_t security_area_size; + size_t integer_area_size = sizeof(u8); + size_t buffer_size; + struct wmi_interface_priv *priv; + + /* look up if user set a password for the requests */ + current_password = get_current_password("Admin"); + if (!current_password) + return -ENODEV; + + /* password is set */ + if (strlen(current_password) > 0) + security_area_size = (sizeof(u32) * 2) + strlen(current_password) + + strlen(current_password) % 2; + /* password not set */ + else + security_area_size = sizeof(u32) * 2; + + buffer_size = security_area_size + integer_area_size; + buffer = kzalloc(buffer_size, GFP_KERNEL); + if (!buffer) + return -ENOMEM; + + /* build security area */ + if (strlen(current_password) > 0) + populate_security_buffer(buffer, current_password); + + mutex_lock(&call_mutex); + priv = get_first_interface_priv(); + if (!priv) { + ret = -ENODEV; + pr_err(DRIVER_NAME ": no WMI backend bound"); + goto out_bios_defaults; + } + + defaultType = buffer + security_area_size; + *defaultType = deftype; + + ret = call_biosattributes_interface(priv->wdev, buffer, buffer_size, + SETBIOSDEFAULTS_METHOD_ID); + if (ret) + dev_err(&priv->wdev->dev, "reset BIOS defaults failed: %d", ret); + priv->pending_changes = 1; +out_bios_defaults: + kfree(buffer); + mutex_unlock(&call_mutex); + + return ret; +} + +static int dell_wmi_bios_attr_set_interface_probe(struct wmi_device *wdev, const void *context) +{ + struct wmi_interface_priv *priv; + + priv = devm_kzalloc(&wdev->dev, sizeof(struct wmi_interface_priv), + GFP_KERNEL); + if (!priv) + return -ENOMEM; + priv->wdev = wdev; + dev_set_drvdata(&wdev->dev, priv); + mutex_lock(&list_mutex); + list_add_tail(&priv->list, &interface_list); + mutex_unlock(&list_mutex); + return 0; +} + +static int dell_wmi_bios_attr_set_interface_remove(struct wmi_device *wdev) +{ + struct wmi_interface_priv *priv = dev_get_drvdata(&wdev->dev); + + mutex_lock(&call_mutex); + mutex_lock(&list_mutex); + list_del(&priv->list); + mutex_unlock(&list_mutex); + mutex_unlock(&call_mutex); + return 0; +} + +static const struct wmi_device_id dell_wmi_bios_attr_set_interface_id_table[] = { + { .guid_string = DELL_WMI_BIOS_ATTRIBUTES_INTERFACE_GUID }, + { }, +}; +static struct wmi_driver dell_wmi_bios_attr_set_interface_driver = { + .driver = { + .name = DRIVER_NAME"-set" + }, + .probe = dell_wmi_bios_attr_set_interface_probe, + .remove = dell_wmi_bios_attr_set_interface_remove, + .id_table = dell_wmi_bios_attr_set_interface_id_table, +}; + +int init_dell_wmi_bios_attr_set_interface(void) +{ + return wmi_driver_register(&dell_wmi_bios_attr_set_interface_driver); +} + +void exit_dell_wmi_bios_attr_set_interface(void) +{ + wmi_driver_unregister(&dell_wmi_bios_attr_set_interface_driver); +} + +MODULE_DEVICE_TABLE(wmi, dell_wmi_bios_attr_set_interface_id_table); diff --git a/drivers/platform/x86/dell-wmi-enum-attributes.c b/drivers/platform/x86/dell-wmi-enum-attributes.c new file mode 100644 index 000000000000..a2d8ae291d5c --- /dev/null +++ b/drivers/platform/x86/dell-wmi-enum-attributes.c @@ -0,0 +1,207 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to enumeration type attributes under BIOS Enumeration GUID for use + * with dell-wmi-sysman + * + * Copyright (c) 2020 Dell Inc. + */ + +#include "dell-wmi-sysman-attributes.h" + +static DEFINE_MUTEX(call_mutex); +static DEFINE_MUTEX(list_mutex); + +/* kept variable names same as in sysfs file name for sysfs_show macro definition */ +struct enumeration_data { + char attribute_name[MAX_BUFF]; + char display_name_language_code[MAX_BUFF]; + char display_name[MAX_BUFF]; + char default_value[MAX_BUFF]; + char current_value[MAX_BUFF]; + char modifier[MAX_BUFF]; + int value_modifier_count; + char value_modifier[MAX_BUFF]; + int possible_value_count; + char possible_value[MAX_BUFF]; +}; + +static struct enumeration_data *enumeration_data; +static int enumeration_instances_count; +get_instance_id(enumeration); + +static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + int instance_id; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + instance_id = get_enumeration_instance_id(kobj); + if (instance_id >= 0) { + union acpi_object *obj; + + obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID); + if (!obj) + return -AE_ERROR; + strncpy_attr(enumeration_data[instance_id].current_value, + obj->package.elements[CURRENT_VAL].string.pointer); + kfree(obj); + return sprintf(buf, "%s\n", enumeration_data[instance_id].current_value); + } + return -EIO; +} + +/** + * validate_enumeration_input() - Validate input of current_value against possible values + * @instance_id: The instance on which input is validated + * @buf: Input value + **/ +int validate_enumeration_input(int instance_id, const char *buf) +{ + int ret = -EINVAL; + char *options, *tmp, *p; + + options = tmp = kstrdup((enumeration_data[instance_id].possible_value), GFP_KERNEL); + if (!options) + return -ENOMEM; + + while ((p = strsep(&options, ";")) != NULL) { + if (!*p) + continue; + if (!strncasecmp(p, buf, strlen(p))) { + ret = 0; + break; + } + } + + kfree(tmp); + return ret; +} + +attribute_s_property_show(display_name_language_code, enumeration); +static struct kobj_attribute displ_langcode = + __ATTR_RO(display_name_language_code); + +attribute_s_property_show(display_name, enumeration); +struct kobj_attribute displ_name = + __ATTR_RO(display_name); + +attribute_s_property_show(default_value, enumeration); +struct kobj_attribute default_val = + __ATTR_RO(default_value); + +attribute_property_store(current_value, enumeration); +struct kobj_attribute current_val = + __ATTR_RW(current_value); + +attribute_s_property_show(modifier, enumeration); +struct kobj_attribute modifier = + __ATTR_RO(modifier); + +attribute_s_property_show(value_modifier, enumeration); +struct kobj_attribute value_modfr = + __ATTR_RO(value_modifier); + +attribute_s_property_show(possible_value, enumeration); +struct kobj_attribute poss_val = + __ATTR_RO(possible_value); + +static struct attribute *enumeration_attrs[] = { + &displ_langcode.attr, + &displ_name.attr, + &default_val.attr, + ¤t_val.attr, + &modifier.attr, + &value_modfr.attr, + &poss_val.attr, + NULL, +}; + +static const struct attribute_group enumeration_attr_group = { + .attrs = enumeration_attrs, +}; + +int alloc_enum_data(void) +{ + int ret = 0; + + enumeration_instances_count = get_instance_count(DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID); + enumeration_data = kzalloc((sizeof(struct enumeration_data) * enumeration_instances_count), + GFP_KERNEL); + if (!enumeration_data) + ret = -ENOMEM; + return ret; +} + +/** + * populate_enum_data() - Populate all properties of an instance under enumeration attribute + * @enumeration_obj: ACPI object with enumeration data + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + **/ +int populate_enum_data(union acpi_object *enumeration_obj, int instance_id, + struct kobject *attr_name_kobj) +{ + int i, next_obj; + int retval = sysfs_create_group(attr_name_kobj, &enumeration_attr_group); + + if (retval) + goto out; + + mutex_lock(&call_mutex); + strncpy_attr(enumeration_data[instance_id].attribute_name, + enumeration_obj[ATTR_NAME].string.pointer); + strncpy_attr(enumeration_data[instance_id].display_name_language_code, + enumeration_obj[DISPL_NAME_LANG_CODE].string.pointer); + strncpy_attr(enumeration_data[instance_id].display_name, + enumeration_obj[DISPLAY_NAME].string.pointer); + strncpy_attr(enumeration_data[instance_id].default_value, + enumeration_obj[DEFAULT_VAL].string.pointer); + strncpy_attr(enumeration_data[instance_id].current_value, + enumeration_obj[CURRENT_VAL].string.pointer); + strncpy_attr(enumeration_data[instance_id].modifier, + enumeration_obj[MODIFIER].string.pointer); + + next_obj = MODIFIER + 1; + + enumeration_data[instance_id].value_modifier_count = + (uintptr_t)enumeration_obj[next_obj].string.pointer; + + for (i = 0; i < enumeration_data[instance_id].value_modifier_count; i++) { + strcat(enumeration_data[instance_id].value_modifier, + enumeration_obj[++next_obj].string.pointer); + strcat(enumeration_data[instance_id].value_modifier, ";"); + } + + enumeration_data[instance_id].possible_value_count = + (uintptr_t) enumeration_obj[++next_obj].string.pointer; + + for (i = 0; i < enumeration_data[instance_id].possible_value_count; i++) { + strcat(enumeration_data[instance_id].possible_value, + enumeration_obj[++next_obj].string.pointer); + strcat(enumeration_data[instance_id].possible_value, ";"); + } + mutex_unlock(&call_mutex); + +out: + return retval; +} + +/** + * exit_enum_attributes() - Clear all attribute data + * @kset: The kset to free + * + * Clears all data allocated for this group of attributes + **/ +void exit_enum_attributes(struct kset *kset) +{ + struct kobject *pos, *next; + + mutex_lock(&list_mutex); + list_for_each_entry_safe(pos, next, &kset->list, entry) { + sysfs_remove_group(pos, &enumeration_attr_group); + } + mutex_unlock(&list_mutex); + mutex_lock(&call_mutex); + kfree(enumeration_data); + mutex_unlock(&call_mutex); +} diff --git a/drivers/platform/x86/dell-wmi-int-attributes.c b/drivers/platform/x86/dell-wmi-int-attributes.c new file mode 100644 index 000000000000..222971be2b48 --- /dev/null +++ b/drivers/platform/x86/dell-wmi-int-attributes.c @@ -0,0 +1,188 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to integer type attributes under BIOS Integer GUID for use with + * dell-wmi-sysman + * + * Copyright (c) 2020 Dell Inc. + */ + +#include "dell-wmi-sysman-attributes.h" + +static DEFINE_MUTEX(call_mutex); +static DEFINE_MUTEX(list_mutex); + +enum int_properties {LOWER_BOUND = 6, UPPER_BOUND, SCALAR_INCR}; + +/* kept variable names same as in sysfs file name for sysfs_show macro definition */ +struct integer_data { + char attribute_name[MAX_BUFF]; + char display_name_language_code[MAX_BUFF]; + char display_name[MAX_BUFF]; + int default_value; + int current_value; + char modifier[MAX_BUFF]; + int lower_bound; + int upper_bound; + int scalar_increment; +}; + +static struct integer_data *integer_data; +static int integer_instances_count; +get_instance_id(integer); + +static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + int instance_id; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + instance_id = get_integer_instance_id(kobj); + if (instance_id >= 0) { + union acpi_object *obj; + + obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID); + if (!obj) + return -AE_ERROR; + integer_data[instance_id].current_value = + (uintptr_t)obj->package.elements[CURRENT_VAL].string.pointer; + kfree(obj); + return sprintf(buf, "%d\n", integer_data[instance_id].current_value); + } + return -EIO; +} + +/** + * validate_integer_input() - Validate input of current_value against lower and upper bound + * @instance_id: The instance on which input is validated + * @buf: Input value + **/ +int validate_integer_input(int instance_id, const char *buf) +{ + int in_val; + int ret = -EINVAL; + + if (kstrtoint(buf, 0, &in_val)) + return -EINVAL; + if ((in_val >= integer_data[instance_id].lower_bound) && + (in_val <= integer_data[instance_id].upper_bound)) + ret = 0; + + return ret; +} + +attribute_s_property_show(display_name_language_code, integer); +static struct kobj_attribute integer_displ_langcode = + __ATTR_RO(display_name_language_code); + +attribute_s_property_show(display_name, integer); +struct kobj_attribute integer_displ_name = + __ATTR_RO(display_name); + +attribute_n_property_show(default_value, integer); +struct kobj_attribute integer_default_val = + __ATTR_RO(default_value); + +attribute_property_store(current_value, integer); +struct kobj_attribute integer_current_val = + __ATTR_RW(current_value); + +attribute_s_property_show(modifier, integer); +struct kobj_attribute integer_modifier = + __ATTR_RO(modifier); + +attribute_n_property_show(lower_bound, integer); +struct kobj_attribute integer_lower_bound = + __ATTR_RO(lower_bound); + +attribute_n_property_show(upper_bound, integer); +struct kobj_attribute integer_upper_bound = + __ATTR_RO(upper_bound); + +attribute_n_property_show(scalar_increment, integer); +struct kobj_attribute integer_scalar_increment = + __ATTR_RO(scalar_increment); + +static struct attribute *integer_attrs[] = { + &integer_displ_langcode.attr, + &integer_displ_name.attr, + &integer_default_val.attr, + &integer_current_val.attr, + &integer_modifier.attr, + &integer_lower_bound.attr, + &integer_upper_bound.attr, + &integer_scalar_increment.attr, + NULL, +}; + +static const struct attribute_group integer_attr_group = { + .attrs = integer_attrs, +}; + +int alloc_int_data(void) +{ + int ret = 0; + + integer_instances_count = get_instance_count(DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID); + integer_data = kzalloc((sizeof(struct integer_data) * integer_instances_count), GFP_KERNEL); + if (!integer_data) + ret = -ENOMEM; + return ret; +} + +/** + * populate_enum_data() - Populate all properties of an instance under integer attribute + * @integer_obj: ACPI object with integer data + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + **/ +int populate_int_data(union acpi_object *integer_obj, int instance_id, + struct kobject *attr_name_kobj) +{ + int retval = sysfs_create_group(attr_name_kobj, &integer_attr_group); + + if (retval) + goto out; + + mutex_lock(&call_mutex); + strncpy_attr(integer_data[instance_id].attribute_name, + integer_obj[ATTR_NAME].string.pointer); + strncpy_attr(integer_data[instance_id].display_name_language_code, + integer_obj[DISPL_NAME_LANG_CODE].string.pointer); + strncpy_attr(integer_data[instance_id].display_name, + integer_obj[DISPLAY_NAME].string.pointer); + integer_data[instance_id].default_value = + (uintptr_t)integer_obj[DEFAULT_VAL].string.pointer; + integer_data[instance_id].current_value = + (uintptr_t)integer_obj[CURRENT_VAL].string.pointer; + strncpy_attr(integer_data[instance_id].modifier, integer_obj[MODIFIER].string.pointer); + integer_data[instance_id].lower_bound = + (uintptr_t)integer_obj[LOWER_BOUND].string.pointer; + integer_data[instance_id].upper_bound = + (uintptr_t)integer_obj[UPPER_BOUND].string.pointer; + integer_data[instance_id].scalar_increment = + (uintptr_t)integer_obj[SCALAR_INCR].string.pointer; + mutex_unlock(&call_mutex); + +out: + return retval; +} + +/** + * exit_int_attributes() - Clear all attribute data + * @kset: The kset to free + * + * Clears all data allocated for this group of attributes + **/ +void exit_int_attributes(struct kset *kset) +{ + struct kobject *pos, *next; + + mutex_lock(&list_mutex); + list_for_each_entry_safe(pos, next, &kset->list, entry) { + sysfs_remove_group(pos, &integer_attr_group); + } + mutex_unlock(&list_mutex); + mutex_lock(&call_mutex); + kfree(integer_data); + mutex_unlock(&call_mutex); +} diff --git a/drivers/platform/x86/dell-wmi-passobj-attributes.c b/drivers/platform/x86/dell-wmi-passobj-attributes.c new file mode 100644 index 000000000000..d430ecf2387b --- /dev/null +++ b/drivers/platform/x86/dell-wmi-passobj-attributes.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to password object type attributes under BIOS Password Object GUID for + * use with dell-wmi-sysman + * + * Copyright (c) 2020 Dell Inc. + */ + +#include "dell-wmi-sysman-attributes.h" + +static DEFINE_MUTEX(call_mutex); +static DEFINE_MUTEX(list_mutex); + +enum po_properties {IS_PASS_SET = 1, MIN_PASS_LEN, MAX_PASS_LEN}; + +/* kept variable names same as in sysfs file name for sysfs_show macro definition */ +struct po_data { + char attribute_name[MAX_BUFF]; + int is_password_set; + int min_password_length; + int max_password_length; +}; + +static struct po_data *po_data; +static int po_instances_count; +get_instance_id(po); + +static ssize_t is_password_set_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + int instance_id = get_po_instance_id(kobj); + + if (instance_id >= 0) { + union acpi_object *obj; + + obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_PASSOBJ_ATTRIBUTE_GUID); + if (!obj) + return -AE_ERROR; + po_data[instance_id].is_password_set = + (uintptr_t)obj->package.elements[IS_PASS_SET].string.pointer; + kfree(obj); + return sprintf(buf, "%d\n", po_data[instance_id].is_password_set); + } + return -EIO; +} + +struct kobj_attribute po_is_pass_set = + __ATTR_RO(is_password_set); + +static ssize_t current_password_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + char *p = memchr(buf, '\n', count); + int ret; + + if (p != NULL) + *p = '\0'; + if (strlen(buf) > MAX_BUFF) + return -EINVAL; + + ret = set_current_password(kobj->name, buf); + return ret ? ret : count; +} + +struct kobj_attribute po_current_password = + __ATTR_WO(current_password); + +static ssize_t new_password_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + char *p = memchr(buf, '\n', count); + int ret; + + if (p != NULL) + *p = '\0'; + if (strlen(buf) > MAX_BUFF) + return -EINVAL; + + ret = set_new_password(kobj->name, buf); + return ret ? ret : count; +} + +struct kobj_attribute po_new_password = + __ATTR_WO(new_password); + +attribute_n_property_show(min_password_length, po); +struct kobj_attribute po_min_pass_length = + __ATTR_RO(min_password_length); + +attribute_n_property_show(max_password_length, po); +struct kobj_attribute po_max_pass_length = + __ATTR_RO(max_password_length); + +static struct attribute *po_attrs[] = { + &po_is_pass_set.attr, + &po_min_pass_length.attr, + &po_max_pass_length.attr, + &po_current_password.attr, + &po_new_password.attr, + NULL, +}; + +static const struct attribute_group po_attr_group = { + .attrs = po_attrs, +}; + +int alloc_po_data(void) +{ + int ret = 0; + + po_instances_count = get_instance_count(DELL_WMI_BIOS_PASSOBJ_ATTRIBUTE_GUID); + po_data = kzalloc((sizeof(struct po_data) * po_instances_count), GFP_KERNEL); + if (!po_data) + ret = -ENOMEM; + return ret; +} + +/** + * populate_po_data() - Populate all properties of an instance under password object attribute + * @po_obj: ACPI object with password object data + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + **/ +int populate_po_data(union acpi_object *po_obj, int instance_id, struct kobject *attr_name_kobj) +{ + int retval = sysfs_create_group(attr_name_kobj, &po_attr_group); + + if (retval) + goto out; + + mutex_lock(&call_mutex); + strncpy_attr(po_data[instance_id].attribute_name, po_obj[ATTR_NAME].string.pointer); + po_data[instance_id].is_password_set = (uintptr_t)po_obj[IS_PASS_SET].string.pointer; + po_data[instance_id].min_password_length = (uintptr_t)po_obj[MIN_PASS_LEN].string.pointer; + po_data[instance_id].max_password_length = (uintptr_t) po_obj[MAX_PASS_LEN].string.pointer; + mutex_unlock(&call_mutex); + +out: + return retval; +} + +/** + * exit_po_attributes() - Clear all attribute data + * @kset: The kset to free + * + * Clears all data allocated for this group of attributes + **/ +void exit_po_attributes(struct kset *kset) +{ + struct kobject *pos, *next; + + mutex_lock(&list_mutex); + list_for_each_entry_safe(pos, next, &kset->list, entry) { + sysfs_remove_group(pos, &po_attr_group); + } + mutex_unlock(&list_mutex); + mutex_lock(&call_mutex); + kfree(po_data); + mutex_unlock(&call_mutex); +} diff --git a/drivers/platform/x86/dell-wmi-passwordattr-interface.c b/drivers/platform/x86/dell-wmi-passwordattr-interface.c new file mode 100644 index 000000000000..9d7ac36e232f --- /dev/null +++ b/drivers/platform/x86/dell-wmi-passwordattr-interface.c @@ -0,0 +1,230 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to SET password methods under BIOS attributes interface GUID + * + * Copyright (c) 2020 Dell Inc. + */ + +#include +#include "dell-wmi-sysman-attributes.h" + +static DEFINE_MUTEX(call_mutex); +static DEFINE_MUTEX(list_mutex); + +struct wmi_interface_priv { + struct list_head list; + struct wmi_device *wdev; + struct device *child; + char current_admin_password[MAX_BUFF]; + char current_system_password[MAX_BUFF]; +}; +static LIST_HEAD(interface_list); + +static inline struct wmi_interface_priv *get_first_interface_priv(void) +{ + return list_first_entry_or_null(&interface_list, + struct wmi_interface_priv, + list); +} + +static int call_password_interface(struct wmi_device *wdev, char *in_args, size_t size) +{ + struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; + struct acpi_buffer input; + union acpi_object *obj; + acpi_status status; + int ret = -EIO; + + input.length = (acpi_size) size; + input.pointer = in_args; + status = wmidev_evaluate_method(wdev, 0, 1, &input, &output); + if (ACPI_FAILURE(status)) + return -EIO; + obj = (union acpi_object *)output.pointer; + if (obj->type == ACPI_TYPE_INTEGER) + ret = obj->integer.value; + + kfree(output.pointer); + kobject_uevent(&wdev->dev.kobj, KOBJ_CHANGE); + return map_wmi_error(ret); +} + +/** + * get_current_password() - Get the current stored password value + * @password_type: The type of password to store + **/ +char *get_current_password(const char *password_type) +{ + struct wmi_interface_priv *priv = get_first_interface_priv(); + + if (!priv) { + pr_err(DRIVER_NAME ": no WMI backend bound"); + return NULL; + } + if (strcmp(password_type, "Admin") == 0) + return priv->current_admin_password; + if (strcmp(password_type, "System") == 0) + return priv->current_system_password; + dev_err(&priv->wdev->dev, "unknown password type %s", password_type); + return NULL; +} + +/** + * set_current_password() - Store current password + * @password_type: The type of password to store + * @current: The current value + * + * Sets the current value of the password. + * This is used for: + * - Resetting password + * - Basis for any functions requiring password to execute + **/ +int set_current_password(const char *password_type, const char *cur) +{ + char *current_password = get_current_password(password_type); + + if (!current_password) + return -ENODEV; + strncpy(current_password, cur, (strlen(cur) + 1)); + return 0; +} + +/** + * set_new_password() - Sets a system admin password + * @password_type: The type of password to set + * @new: The new password + * + * Sets the password using plaintext interface + **/ +int set_new_password(const char *password_type, const char *new) +{ + int ret = -1; + int i; + u8 *type_len, *old_len, *new_len; + char *current_password, *type_value, *old_value, *new_value; + size_t security_area_size; + size_t string_area_size; + size_t buffer_size; + struct wmi_interface_priv *priv; + char *buffer; + + mutex_lock(&call_mutex); + priv = get_first_interface_priv(); + if (!priv) { + ret = -ENODEV; + pr_err(DRIVER_NAME ": no WMI backend bound"); + goto out_close_mutex; + } + current_password = get_current_password(password_type); + if (!current_password) { + ret = -ENODEV; + goto out_close_mutex; + } + /* password is set */ + if (strlen(current_password) > 0) + security_area_size = (sizeof(u32) * 2) + strlen(current_password) + + strlen(current_password) % 2; + /* password not set */ + else + security_area_size = sizeof(u32) * 2; + string_area_size = (strlen(password_type) + strlen(current_password) + strlen(new))*2; + buffer_size = security_area_size + string_area_size + sizeof(u16) * 3; + + buffer = kzalloc(buffer_size, GFP_KERNEL); + + if (!buffer) { + ret = -ENOMEM; + goto out_close_mutex; + } + + /* build security area */ + if (strlen(current_password) > 0) + populate_security_buffer(buffer, current_password); + + type_len = buffer + security_area_size; + type_value = type_len + sizeof(u16); + old_len = type_value + strlen(password_type)*2; + old_value = old_len + sizeof(u16); + new_len = old_value + strlen(current_password)*2; + new_value = new_len + sizeof(u16); + + /* turn into UTF16 strings, no NULL terminator */ + *type_len = strlen(password_type)*2; + *old_len = strlen(current_password)*2; + *new_len = strlen(new)*2; + for (i = 0; i < strlen(password_type); i++) + type_value[i*2] = password_type[i]; + for (i = 0; i < strlen(current_password); i++) + old_value[i*2] = current_password[i]; + for (i = 0; i < strlen(new); i++) + new_value[i*2] = new[i]; + + ret = call_password_interface(priv->wdev, buffer, buffer_size); + /* update current password so commands work after reset */ + if (!ret) + ret = set_current_password(password_type, new); + /* explain to user the detailed failure reason */ + else if (ret == -EOPNOTSUPP) + dev_err(&priv->wdev->dev, "admin password must be configured"); + else if (ret == -EACCES) + dev_err(&priv->wdev->dev, "invalid password"); + kfree(buffer); + +out_close_mutex: + mutex_unlock(&call_mutex); + + return ret; +} + +static int dell_wmi_bios_attr_pass_interface_probe(struct wmi_device *wdev, const void *context) +{ + struct wmi_interface_priv *priv; + + priv = devm_kzalloc(&wdev->dev, sizeof(struct wmi_interface_priv), + GFP_KERNEL); + if (!priv) + return -ENOMEM; + priv->wdev = wdev; + dev_set_drvdata(&wdev->dev, priv); + mutex_lock(&list_mutex); + list_add_tail(&priv->list, &interface_list); + mutex_unlock(&list_mutex); + return 0; +} + +static int dell_wmi_bios_attr_pass_interface_remove(struct wmi_device *wdev) +{ + struct wmi_interface_priv *priv = dev_get_drvdata(&wdev->dev); + + mutex_lock(&call_mutex); + mutex_lock(&list_mutex); + list_del(&priv->list); + mutex_unlock(&list_mutex); + mutex_unlock(&call_mutex); + return 0; +} + +static const struct wmi_device_id dell_wmi_bios_attr_pass_interface_id_table[] = { + { .guid_string = DELL_WMI_BIOS_PASSWORD_INTERFACE_GUID }, + { }, +}; +static struct wmi_driver dell_wmi_bios_attr_pass_interface_driver = { + .driver = { + .name = DRIVER_NAME"-password" + }, + .probe = dell_wmi_bios_attr_pass_interface_probe, + .remove = dell_wmi_bios_attr_pass_interface_remove, + .id_table = dell_wmi_bios_attr_pass_interface_id_table, +}; + +int init_dell_wmi_bios_attr_pass_interface(void) +{ + return wmi_driver_register(&dell_wmi_bios_attr_pass_interface_driver); +} + +void exit_dell_wmi_bios_attr_pass_interface(void) +{ + wmi_driver_unregister(&dell_wmi_bios_attr_pass_interface_driver); +} + +MODULE_DEVICE_TABLE(wmi, dell_wmi_bios_attr_pass_interface_id_table); diff --git a/drivers/platform/x86/dell-wmi-string-attributes.c b/drivers/platform/x86/dell-wmi-string-attributes.c new file mode 100644 index 000000000000..562d09055dd1 --- /dev/null +++ b/drivers/platform/x86/dell-wmi-string-attributes.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to string type attributes under BIOS String GUID for use with + * dell-wmi-sysman + * + * Copyright (c) 2020 Dell Inc. + */ + +#include "dell-wmi-sysman-attributes.h" + +static DEFINE_MUTEX(call_mutex); +static DEFINE_MUTEX(list_mutex); + +enum string_properties {MIN_LEN = 6, MAX_LEN}; + +/* kept variable names same as in sysfs file name for sysfs_show macro definition */ +struct str_data { + char attribute_name[MAX_BUFF]; + char display_name_language_code[MAX_BUFF]; + char display_name[MAX_BUFF]; + char default_value[MAX_BUFF]; + char current_value[MAX_BUFF]; + char modifier[MAX_BUFF]; + int min_length; + int max_length; +}; + +static struct str_data *str_data; +static int str_instances_count; +get_instance_id(str); + +static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + int instance_id; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + instance_id = get_str_instance_id(kobj); + if (instance_id >= 0) { + union acpi_object *obj; + + obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID); + if (!obj) + return -AE_ERROR; + strncpy_attr(str_data[instance_id].current_value, + obj->package.elements[CURRENT_VAL].string.pointer); + kfree(obj); + return sprintf(buf, "%s\n", str_data[instance_id].current_value); + } + return -EIO; +} + +/** + * validate_str_input() - Validate input of current_value against min and max lengths + * @instance_id: The instance on which input is validated + * @buf: Input value + **/ +int validate_str_input(int instance_id, const char *buf) +{ + int in_len = strlen(buf); + + if ((in_len >= str_data[instance_id].min_length) && + (in_len <= str_data[instance_id].max_length)) + return 0; + + return -EINVAL; +} + +attribute_s_property_show(display_name_language_code, str); +static struct kobj_attribute str_displ_langcode = + __ATTR_RO(display_name_language_code); + +attribute_s_property_show(display_name, str); +struct kobj_attribute str_displ_name = + __ATTR_RO(display_name); + +attribute_s_property_show(default_value, str); +struct kobj_attribute str_default_val = + __ATTR_RO(default_value); + +attribute_property_store(current_value, str); +struct kobj_attribute str_current_val = + __ATTR_RW(current_value); + +attribute_s_property_show(modifier, str); +struct kobj_attribute str_modifier = + __ATTR_RO(modifier); + +attribute_n_property_show(min_length, str); +struct kobj_attribute str_min_length = + __ATTR_RO(min_length); + +attribute_n_property_show(max_length, str); +struct kobj_attribute str_max_length = + __ATTR_RO(max_length); + +static struct attribute *str_attrs[] = { + &str_displ_langcode.attr, + &str_displ_name.attr, + &str_default_val.attr, + &str_current_val.attr, + &str_modifier.attr, + &str_min_length.attr, + &str_max_length.attr, + NULL, +}; + +static const struct attribute_group str_attr_group = { + .attrs = str_attrs, +}; + +int alloc_str_data(void) +{ + int ret = 0; + + str_instances_count = get_instance_count(DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID); + str_data = kzalloc((sizeof(struct str_data) * str_instances_count), GFP_KERNEL); + if (!str_data) + ret = -ENOMEM; + return ret; +} + +/** + * populate_enum_data() - Populate all properties of an instance under string attribute + * @str_obj: ACPI object with integer data + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + **/ +int populate_str_data(union acpi_object *str_obj, int instance_id, struct kobject *attr_name_kobj) +{ + int retval = sysfs_create_group(attr_name_kobj, &str_attr_group); + + if (retval) + goto out; + + mutex_lock(&call_mutex); + strncpy_attr(str_data[instance_id].attribute_name, str_obj[ATTR_NAME].string.pointer); + strncpy_attr(str_data[instance_id].display_name_language_code, + str_obj[DISPL_NAME_LANG_CODE].string.pointer); + strncpy_attr(str_data[instance_id].display_name, str_obj[DISPLAY_NAME].string.pointer); + strncpy_attr(str_data[instance_id].default_value, str_obj[DEFAULT_VAL].string.pointer); + strncpy_attr(str_data[instance_id].current_value, str_obj[CURRENT_VAL].string.pointer); + strncpy_attr(str_data[instance_id].modifier, str_obj[MODIFIER].string.pointer); + str_data[instance_id].min_length = (uintptr_t)str_obj[MIN_LEN].string.pointer; + str_data[instance_id].max_length = (uintptr_t) str_obj[MAX_LEN].string.pointer; + mutex_unlock(&call_mutex); + +out: + return retval; +} + +/** + * exit_str_attributes() - Clear all attribute data + * @kset: The kset to free + * + * Clears all data allocated for this group of attributes + **/ +void exit_str_attributes(struct kset *kset) +{ + struct kobject *pos, *next; + + mutex_lock(&list_mutex); + list_for_each_entry_safe(pos, next, &kset->list, entry) { + sysfs_remove_group(pos, &str_attr_group); + } + mutex_unlock(&list_mutex); + mutex_lock(&call_mutex); + kfree(str_data); + mutex_unlock(&call_mutex); +} diff --git a/drivers/platform/x86/dell-wmi-sysman-attributes.c b/drivers/platform/x86/dell-wmi-sysman-attributes.c new file mode 100644 index 000000000000..485545ab6c8b --- /dev/null +++ b/drivers/platform/x86/dell-wmi-sysman-attributes.c @@ -0,0 +1,575 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Common methods for use with dell-wmi-sysman + * + * Copyright (c) 2020 Dell Inc. + */ + +#include +#include +#include +#include +#include +#include "dell-wmi-sysman-attributes.h" + +static DEFINE_MUTEX(call_mutex); +static DEFINE_MUTEX(list_mutex); + +#define MAX_TYPES 4 + +static struct platform_device *platform_device; + +static struct platform_driver platform_driver = { + .driver = { + .name = DRIVER_NAME, + }, +}; + +/* attribute directory under platform dev */ +struct kset *main_dir_kset; +/* subtypes of attributes */ +struct kset *type_dir_kset[MAX_TYPES]; + +/* reset bios to defaults */ +static const char * const reset_types[] = {"builtinsafe", "lastknowngood", "factory", "custom"}; +static int reset_option = -1; + +/** + * populate_security_buffer() - builds a security buffer for authentication scheme + * @buffer: the buffer to populate + * @authentication: the authentication content + * + * Currently only supported type is PLAIN TEXT + **/ +void populate_security_buffer(char *buffer, char *authentication) +{ + u32 *sectype = (u32 *) buffer; + u32 *seclen = sectype + 1; + char *auth = buffer + sizeof(u32)*2; + /* plain text */ + *sectype = 1; + *seclen = strlen(authentication); + strncpy(auth, authentication, *seclen); +} + +/** + * map_wmi_error() - map errors from WMI methods to kernel error codes + **/ +int map_wmi_error(int error_code) +{ + switch (error_code) { + case 0: + /* success */ + return 0; + case 1: + /* failed */ + return -EIO; + case 2: + /* invalid parameter */ + return -EINVAL; + case 3: + /* access denied */ + return -EACCES; + case 4: + /* not supported */ + return -EOPNOTSUPP; + case 5: + /* memory error */ + return -ENOMEM; + case 6: + /* protocol error */ + return -EPROTO; + } + /* unspecified error */ + return -EIO; +} + +/** + * reset_bios_show() - sysfs implementaton for read reset_bios + * @kobj: Kernel object for this attribute + * @attr: Kernel object attribute + * @buf: The buffer to display to userspace + **/ +static ssize_t reset_bios_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + int i; + char *start = buf; + + for (i = 0; i < MAX_TYPES; i++) { + if (i == reset_option) + buf += sprintf(buf, "[%s] ", reset_types[i]); + else + buf += sprintf(buf, "%s ", reset_types[i]); + } + buf += sprintf(buf, "\n"); + return buf-start; +} + +/** + * reset_bios_store() - sysfs implementaton for write reset_bios + * @kobj: Kernel object for this attribute + * @attr: Kernel object attribute + * @buf: The buffer from userspace + * @count: the size of the buffer from userspace + **/ +static ssize_t reset_bios_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + int len, ret, i; + int type = -1; + char *p; + + p = memchr(buf, '\n', count); + if (p != NULL) + *p = '\0'; + len = p ? p - buf : count; + + for (i = 0; i < MAX_TYPES; i++) { + if (len == strlen(reset_types[i]) + && !strncmp(buf, reset_types[i], len)) { + type = i; + break; + } + } + + if (type < 0 || type >= MAX_TYPES) { + ret = -EINVAL; + goto out; + } + + ret = set_bios_defaults(type); + dev_dbg(&platform_device->dev, "reset all attributes request type %d: %d", type, ret); + if (ret) { + ret = -EINVAL; + } else { + reset_option = type; + ret = count; + } + +out: + return ret; +} + +/** + * pending_reboot_show() - sysfs implementaton for read pending_reboot + * @kobj: Kernel object for this attribute + * @attr: Kernel object attribute + * @buf: The buffer to display to userspace + * + * Stores default value as 0 + * When current_value is changed this attribute is set to 1 to notify reboot may be required + **/ +static ssize_t pending_reboot_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%d\n", get_pending_changes()); +} + +static struct kobj_attribute reset_bios = __ATTR_RW(reset_bios); +static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot); + + +/** + * create_reset_bios() - Creates reset_bios and pending_reboot attributes + **/ +static int create_reset_bios(void) +{ + int ret = sysfs_create_file(&main_dir_kset->kobj, &reset_bios.attr); + + if (ret) { + dev_dbg(&platform_device->dev, "could not create reset_bios file"); + return ret; + } + + ret = sysfs_create_file(&main_dir_kset->kobj, &pending_reboot.attr); + if (ret) { + dev_dbg(&platform_device->dev, "could not create changing_pending_reboot file"); + sysfs_remove_file(&main_dir_kset->kobj, &reset_bios.attr); + } + return ret; +} + +static void release_reset_bios_data(void) +{ + sysfs_remove_file(&main_dir_kset->kobj, &reset_bios.attr); + sysfs_remove_file(&main_dir_kset->kobj, &pending_reboot.attr); +} + +static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + struct kobj_attribute *kattr; + ssize_t ret = -EIO; + + kattr = container_of(attr, struct kobj_attribute, attr); + if (kattr->show) + ret = kattr->show(kobj, kattr, buf); + return ret; +} + +static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + struct kobj_attribute *kattr; + ssize_t ret = -EIO; + + kattr = container_of(attr, struct kobj_attribute, attr); + if (kattr->store) + ret = kattr->store(kobj, kattr, buf, count); + return ret; +} + +const struct sysfs_ops kobj_sysfs_ops = { + .show = kobj_attr_show, + .store = kobj_attr_store, +}; + +static void attr_name_release(struct kobject *kobj) +{ + kfree(kobj); +} + +static struct kobj_type attr_name_ktype = { + .release = attr_name_release, + .sysfs_ops = &kobj_sysfs_ops, +}; + +/** + * strncpy_attr - Copy a length-limited, NULL-terminated string with bound checks + * @dest: Where to copy the string to + * @src: Where to copy the string from + **/ +void strncpy_attr(char *dest, char *src) +{ + size_t len = strlen(src) + 1; + + if (len > 1 && len < MAX_BUFF) + strncpy(dest, src, len); +} + +/** + * get_wmiobj_pointer() - Get Content of WMI block for particular instance + * @instance_id: WMI instance ID + * @guid_string: WMI GUID (in str form) + * + * Fetches the content for WMI block (instance_id) under GUID (guid_string) + * Caller must kfree the return + **/ +union acpi_object *get_wmiobj_pointer(int instance_id, const char *guid_string) +{ + acpi_status status; + struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; + + status = wmi_query_block(guid_string, instance_id, &out); + + return ACPI_SUCCESS(status) ? (union acpi_object *)out.pointer : NULL; +} + +/** + * get_instance_count() - Compute total number of instances under guid_string + * @guid_string: WMI GUID (in string form) + **/ +int get_instance_count(const char *guid_string) +{ + int i = 0; + union acpi_object *wmi_obj = NULL; + + do { + kfree(wmi_obj); + wmi_obj = get_wmiobj_pointer(i, guid_string); + i++; + } while (wmi_obj); + + return (i-1); +} + +/** + * alloc_attributes_data() - Allocate attributes data for a particular type + * @attr_type: Attribute type to allocate + **/ +static int alloc_attributes_data(int attr_type) +{ + int retval = 0; + char *type[MAX_TYPES] = {"enumeration", "integer", "string", "password"}; + + type_dir_kset[attr_type] = kset_create_and_add(type[attr_type], NULL, &main_dir_kset->kobj); + if (!type_dir_kset[attr_type]) + goto err_bios_attr; + + switch (attr_type) { + case ENUM: + retval = alloc_enum_data(); + break; + case INT: + retval = alloc_int_data(); + break; + case STR: + retval = alloc_str_data(); + break; + case PO: + retval = alloc_po_data(); + break; + default: + break; + } + + goto out; + +err_bios_attr: + kset_unregister(main_dir_kset); + +out: + return retval; +} + +/** + * destroy_attribute_objs() - Free a kset of kobjects + * @kset: The kset to destroy + * + * Fress kobjects created for each attribute_name under attribute type kset + **/ +static void destroy_attribute_objs(struct kset *kset) +{ + struct kobject *pos, *next; + + mutex_lock(&list_mutex); + list_for_each_entry_safe(pos, next, &kset->list, entry) { + kobject_put(pos); + } + mutex_unlock(&list_mutex); +} + +/** + * release_attributes_data() - Clean-up all sysfs directories and files created + **/ +static void release_attributes_data(void) +{ + release_reset_bios_data(); + + exit_enum_attributes(type_dir_kset[ENUM]); + exit_int_attributes(type_dir_kset[INT]); + exit_str_attributes(type_dir_kset[STR]); + exit_po_attributes(type_dir_kset[PO]); + + mutex_lock(&call_mutex); + if (main_dir_kset) { + int i; + + /* unregister all 4 types ENUM,INT,STR and PO */ + for (i = ENUM; i <= PO; i++) { + destroy_attribute_objs(type_dir_kset[i]); + kset_unregister(type_dir_kset[i]); + } + kset_unregister(main_dir_kset); + } + mutex_unlock(&call_mutex); +} + +/** + * init_bios_attributes() - Initialize all attributes for a type + * @attr_type: The attribute type to initialize + * @guid: The WMI GUID associated with this type to initialize + * + * Initialiaze all 4 types of attributes enumeration, integer, string and password object. + * Populates each attrbute typ's respective properties under sysfs files + **/ +static int init_bios_attributes(int attr_type, const char *guid) +{ + union acpi_object *obj = NULL; + union acpi_object *elements; + int retval = 0; + int instance_id = 0; + struct kobject *attr_name_kobj; //individual attribute names + + retval = alloc_attributes_data(attr_type); + if (retval) + return retval; + obj = get_wmiobj_pointer(instance_id, guid); + if (!obj) + return -ENODEV; + elements = obj->package.elements; + + while (elements) { + /* sanity checking */ + if (strlen(elements[ATTR_NAME].string.pointer) == 0) { + dev_dbg(&platform_device->dev, "empty attribute found"); + goto nextobj; + } + if (kset_find_obj(type_dir_kset[attr_type], elements[ATTR_NAME].string.pointer)) { + dev_dbg(&platform_device->dev, "duplicate attribute name found - %s", + elements[ATTR_NAME].string.pointer); + goto nextobj; + } + + /* build attribute */ + attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL); + if (!attr_name_kobj) + goto err_attr_init; + + attr_name_kobj->kset = type_dir_kset[attr_type]; + + retval = kobject_init_and_add(attr_name_kobj, &attr_name_ktype, NULL, "%s", + elements[ATTR_NAME].string.pointer); + if (retval) { + kobject_put(attr_name_kobj); + goto err_attr_init; + } + + /* enumerate all of this attribute */ + switch (attr_type) { + case ENUM: + retval = populate_enum_data(elements, instance_id, attr_name_kobj); + break; + case INT: + retval = populate_int_data(elements, instance_id, attr_name_kobj); + break; + case STR: + retval = populate_str_data(elements, instance_id, attr_name_kobj); + break; + case PO: + retval = populate_po_data(elements, instance_id, attr_name_kobj); + break; + default: + break; + } + + if (retval) { + dev_dbg(&platform_device->dev, "failed to populate %s", + elements[ATTR_NAME].string.pointer); + goto err_attr_init; + } + +nextobj: + kfree(obj); + instance_id++; + obj = get_wmiobj_pointer(instance_id, guid); + elements = obj ? obj->package.elements : NULL; + } + + goto out; + +err_attr_init: + release_attributes_data(); + kfree(obj); +out: + return retval; +} + +static int __init init_dell_bios_attrib_wmi(void) +{ + int ret = 0; + + if (!dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "Dell System", NULL) && + !dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "www.dell.com", NULL)) { + pr_err("Unable to run on non-Dell system\n"); + return -ENODEV; + } + + ret = platform_driver_register(&platform_driver); + if (ret) + goto fail_platform_driver; + + platform_device = platform_device_alloc(DRIVER_NAME, -1); + if (!platform_device) { + ret = -ENOMEM; + goto fail_platform_device_alloc; + } + + ret = platform_device_add(platform_device); + if (ret) + goto fail_platform_device_add; + + main_dir_kset = kset_create_and_add("attributes", NULL, &platform_device->dev.kobj); + if (!main_dir_kset) { + ret = -ENOMEM; + goto fail_platform_device_add; + } + + ret = init_dell_wmi_bios_attr_set_interface(); + if (ret) { + dev_dbg(&platform_device->dev, "failed to initialize set interface"); + goto fail_kset; + } + + ret = init_dell_wmi_bios_attr_pass_interface(); + if (ret) { + dev_dbg(&platform_device->dev, "failed to initialize pass interface"); + goto fail_set_interface; + } + + ret = create_reset_bios(); + if (ret) { + dev_dbg(&platform_device->dev, "could not create reset BIOS attribute"); + goto fail_pass_interface; + } + + ret = init_bios_attributes(ENUM, DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID); + if (ret) { + dev_dbg(&platform_device->dev, "failed to populate enumeration type attributes"); + goto fail_create_group; + } + + ret = init_bios_attributes(INT, DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID); + if (ret) { + dev_dbg(&platform_device->dev, "failed to populate integer type attributes"); + goto fail_create_group; + } + + ret = init_bios_attributes(STR, DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID); + if (ret) { + dev_dbg(&platform_device->dev, "failed to populate string type attributes"); + goto fail_create_group; + } + + ret = init_bios_attributes(PO, DELL_WMI_BIOS_PASSOBJ_ATTRIBUTE_GUID); + if (ret) { + dev_dbg(&platform_device->dev, "failed to populate pass object type attributes"); + goto fail_create_group; + } + + return 0; + +fail_create_group: + release_attributes_data(); + platform_device_del(platform_device); + +fail_pass_interface: + exit_dell_wmi_bios_attr_pass_interface(); + +fail_set_interface: + exit_dell_wmi_bios_attr_set_interface(); + +fail_kset: + kset_unregister(main_dir_kset); + +fail_platform_device_add: + platform_device_put(platform_device); + +fail_platform_device_alloc: + platform_driver_unregister(&platform_driver); + +fail_platform_driver: + return ret; +} + +static void __exit exit_dell_bios_attrib_wmi(void) +{ + release_attributes_data(); + mutex_lock(&call_mutex); + exit_dell_wmi_bios_attr_set_interface(); + exit_dell_wmi_bios_attr_pass_interface(); + if (platform_device) { + platform_device_unregister(platform_device); + platform_driver_unregister(&platform_driver); + } + mutex_unlock(&call_mutex); +} + +module_init(init_dell_bios_attrib_wmi); +module_exit(exit_dell_bios_attrib_wmi); + +MODULE_AUTHOR("Mario Limonciello "); +MODULE_AUTHOR("Prasanth Ksr "); +MODULE_AUTHOR("Divya Bharathi "); +MODULE_DESCRIPTION("Dell platform setting control interface"); +MODULE_LICENSE("GPL"); diff --git a/drivers/platform/x86/dell-wmi-sysman-attributes.h b/drivers/platform/x86/dell-wmi-sysman-attributes.h new file mode 100644 index 000000000000..bb5053b91ec7 --- /dev/null +++ b/drivers/platform/x86/dell-wmi-sysman-attributes.h @@ -0,0 +1,125 @@ +/* SPDX-License-Identifier: GPL-2.0 + * Definitions for kernel modules using Dell WMI System Management Driver + * + * Copyright (c) 2020 Dell Inc. + */ + +#ifndef _DELL_WMI_BIOS_ATTR_H_ +#define _DELL_WMI_BIOS_ATTR_H_ + +#include +#include +#include +#include +#include +#include + +#define DRIVER_NAME "dell-wmi-sysman" +#define MAX_BUFF 512 + +#define DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID "F1DDEE52-063C-4784-A11E-8A06684B9BF5" +#define DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID "F1DDEE52-063C-4784-A11E-8A06684B9BFA" +#define DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID "F1DDEE52-063C-4784-A11E-8A06684B9BF9" +#define DELL_WMI_BIOS_PASSOBJ_ATTRIBUTE_GUID "0894B8D6-44A6-4719-97D7-6AD24108BFD4" +#define DELL_WMI_BIOS_ATTRIBUTES_INTERFACE_GUID "F1DDEE52-063C-4784-A11E-8A06684B9BF4" +#define DELL_WMI_BIOS_PASSWORD_INTERFACE_GUID "70FE8229-D03B-4214-A1C6-1F884B1A892A" + +enum { ENUM, INT, STR, PO }; + +enum { + ATTR_NAME, + DISPL_NAME_LANG_CODE, + DISPLAY_NAME, + DEFAULT_VAL, + CURRENT_VAL, + MODIFIER +}; + +#define get_instance_id(type) \ +int get_##type##_instance_id(struct kobject *kobj) \ +{ \ + int i; \ + for (i = 0; i <= type##_instances_count; i++) { \ + if (!(strcmp(kobj->name, type##_data[i].attribute_name))) \ + return i; \ + } \ + return -EIO; \ +} + +#define attribute_s_property_show(name, type) \ +static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, \ + char *buf) \ +{ \ + int i = get_##type##_instance_id(kobj); \ + if (i >= 0) \ + return sprintf(buf, "%s\n", type##_data[i].name); \ + return 0; \ +} + +#define attribute_n_property_show(name, type) \ +static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, \ + char *buf) \ +{ \ + int i = get_##type##_instance_id(kobj); \ + if (i >= 0) \ + return sprintf(buf, "%d\n", type##_data[i].name); \ + return 0; \ +} + +#define attribute_property_store(curr_val, type) \ +static ssize_t curr_val##_store(struct kobject *kobj, \ + struct kobj_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + char *p = memchr(buf, '\n', count); \ + int ret = -EIO; \ + int i; \ + \ + if (p != NULL) \ + *p = '\0'; \ + i = get_##type##_instance_id(kobj); \ + if (i >= 0) \ + ret = validate_##type##_input(i, buf); \ + if (!ret) \ + ret = set_attribute(kobj->name, buf); \ + return ret ? ret : count; \ +} + +union acpi_object *get_wmiobj_pointer(int instance_id, const char *guid_string); +int get_instance_count(const char *guid_string); +void strncpy_attr(char *dest, char *src); + +int populate_enum_data(union acpi_object *enumeration_obj, int instance_id, + struct kobject *attr_name_kobj); +int alloc_enum_data(void); +void exit_enum_attributes(struct kset *kset); + +int populate_int_data(union acpi_object *integer_obj, int instance_id, + struct kobject *attr_name_kobj); +int alloc_int_data(void); +void exit_int_attributes(struct kset *kset); + +int populate_str_data(union acpi_object *str_obj, int instance_id, struct kobject *attr_name_kobj); +int alloc_str_data(void); +void exit_str_attributes(struct kset *kset); + +int populate_po_data(union acpi_object *po_obj, int instance_id, struct kobject *attr_name_kobj); +int alloc_po_data(void); +void exit_po_attributes(struct kset *kset); + +int set_attribute(const char *a_name, const char *a_value); +int set_bios_defaults(u8 defType); + +void exit_dell_wmi_bios_attr_set_interface(void); +int init_dell_wmi_bios_attr_set_interface(void); +bool get_pending_changes(void); +int map_wmi_error(int error_code); +void populate_security_buffer(char *buffer, char *authentication); + +char *get_current_password(const char *password_type); +int set_current_password(const char *password_type, const char *cur); +int set_new_password(const char *password_type, const char *new); +int init_dell_wmi_bios_attr_pass_interface(void); +void exit_dell_wmi_bios_attr_pass_interface(void); + +#endif