From patchwork Mon Sep 12 12:53:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Armin Wolf X-Patchwork-Id: 12973653 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6535EC6FA8D for ; Mon, 12 Sep 2022 12:54:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229845AbiILMyW (ORCPT ); Mon, 12 Sep 2022 08:54:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59674 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229873AbiILMyT (ORCPT ); Mon, 12 Sep 2022 08:54:19 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.17.22]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 99E6F39B89; Mon, 12 Sep 2022 05:54:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1662987234; bh=hk5t2e+oj5yO3UwZJOPmpX0A2h5nxw6Irm3GZCkWWjU=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=HZWjZnyC8mmH39rZ70BLIu0Cim5NB0ZDJxvgLF2XA2+ZjU/HS6umYzThUSSCyUhu2 CzrGQuaulWf7Cg7ZHPFgfyXfX14qpYhrUPL3q6tBO/0tuVA1NWVXTln5W3OEzRObDB LUHCe8EFkba8Cq5SN2fs6ScYdGZbc4MPErYPY8tk= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from esprimo-mx.users.agdsn.de ([141.30.226.129]) by mail.gmx.net (mrgmx104 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MwQXN-1pNM1s3Em5-00sQDs; Mon, 12 Sep 2022 14:53:53 +0200 From: Armin Wolf To: hdegoede@redhat.com, markgross@kernel.org Cc: rafael@kernel.org, lenb@kernel.org, hmh@hmh.eng.br, matan@svgalib.org, corentin.chary@gmail.com, jeremy@system76.com, productdev@system76.com, platform-driver-x86@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/5] platform/x86: dell: Add new dell-wmi-ddv driver Date: Mon, 12 Sep 2022 14:53:42 +0200 Message-Id: <20220912125342.7395-6-W_Armin@gmx.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220912125342.7395-1-W_Armin@gmx.de> References: <20220912125342.7395-1-W_Armin@gmx.de> MIME-Version: 1.0 X-Provags-ID: V03:K1:KaVfppH25SNtBQGGAmEyAtS0NiHFH55eBR6zzMvq90fkEtS/DPR GOPZeJ8Sgpddz82XlGlApc+1btIcF6tZCxiXFlq/+W2ScyIDPmzYtX2OqqNccNGnr20z9Ir oGXVXh++sR3sN0MKOjnGY1HF4JNpZdareqocfjMZ8U9pPY/Gu3fB3aQ4UOKWXMYz2l9E21+ yJ69fKP0PxGjbuIIX6dgg== X-UI-Out-Filterresults: notjunk:1;V03:K0:RzHAru8r6rI=:JdiMj+2Ur3Qi89yC8XarXY P28XAeVcDLdAVGc+WXot5FlgU4sQNjm1uPnJ6m/8pgS5R792MZtVmpJe+Ox17msIE2ASxsSWW A/+TYktsBlOiz4b/AJ8EGpwDM1opE5kvi2/l/y+dbUWjAruc6YpzDXVNVjzE3LbxrYwocmi0g JYhN1o/uSjFfJChFq38X8HLY5jGaAzQnnC1t9iUsC78lgW1DwbO7iMHZLB7g7N+cN66G/d7Cb sJZUQ8qTPkIj5gW+Cya4BdVR4GaOuHdAnHzhgSyHbUsY7R4QZlEdXvd5zn39gLAPA9ezjRZoE Eg/XQ7RiR61NeMPvQbxEkPq2Y37VD3v7RYqNlAX3Mda2D1Kb0d1VohqtD8DCvc90rZ3iQxTL9 nYKGEHzcrkye8auHZpzguiYU+Bnl8aLRg7WLO9F2fei6MFCpYgES3ncmsEHv4b9pQBgz6vL19 vj6gckoiYgvGhWQkuZE5/ARb6PbzerHLK85aHxFluVnnTnbdnaE9su5KxzxsHrNwmD6JFE3kN Mv+49KQIYRkkpzPrp4rG2Cvd9ZpKR5yb+tfup6+0bpmrplOxXDDitTkE/HDhfpK11+Cs7aw96 7MC8OGs+avPUBJLoOLriRNrXro8BY57IISIjex9DWBRIyeAT39ShAyi80foHHeM4USJ/EoJkd Zz9VuewbsWoWdJIjMe5PaIDjbTjyOVqMsecseBbDY2mPe7n0VAT/dqXmwnKShwcOCsc/gSabl R0JHD4i3+6ttotCIshOxuslYmQt/MdDPYk2Y0omQ5L+vKprk5bIfrhq21WdNNRrmWQaTdVkn4 aIEu1TRiZKaIB9pM3JXQu09wBFV8Ql3mmba09Y5H3NslLKALyzfPZLZZoIfeEIqD/J/nqP6MG wcL/jwll7Rcj7LL0tR5weRqCe3MdHMiFv/zTLH0CHAGOGI0MlLEkU5YrtM2fDI+hiAEDOaDTd m3RPY+IB2zZUgM2dkkM5ECfS8du1duYwAva00aMzSnBL2q+BY6knqbm9zsJ1XspngWjTHEglA i4kJe1aO4ujL4h0SMEYVDTuola7RDhVILiKv/x5FM9lGJ/RJvB1C4e0WtEy7yIbsjj/Pj/qip WyoxpOBOtTf10EMFqob715c+Vxz22UdiuOK/sDEwvUkzWxlmOoZ+624s6p0ZZQm2BTexTALij APYx4XIjfdIYTHoX8QIC+1MasJ Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org The dell-wmi-ddv driver adds support for reading the current temperature and ePPID of ACPI batteries on supported Dell machines. Since the WMI interface used by this driver does not do any input validation and thus cannot be used for probing, the driver depends on the ACPI battery extension machanism to discover batteries. The driver also supports a debugfs interface for retrieving buffers containing fan and thermal sensor information. Since the meaing of the content of those buffers is currently unknown, the interface is meant for reverse-engineering and will likely be replaced with an hwmon interface once the meaning has been understood. The driver was tested on a Dell Inspiron 3505. Signed-off-by: Armin Wolf Reviewed-by: Hans de Goede --- .../ABI/testing/debugfs-dell-wmi-ddv | 21 + .../ABI/testing/sysfs-platform-dell-wmi-ddv | 16 + MAINTAINERS | 7 + drivers/platform/x86/dell/Kconfig | 13 + drivers/platform/x86/dell/Makefile | 1 + drivers/platform/x86/dell/dell-wmi-ddv.c | 365 ++++++++++++++++++ drivers/platform/x86/wmi.c | 1 + 7 files changed, 424 insertions(+) create mode 100644 Documentation/ABI/testing/debugfs-dell-wmi-ddv create mode 100644 Documentation/ABI/testing/sysfs-platform-dell-wmi-ddv create mode 100644 drivers/platform/x86/dell/dell-wmi-ddv.c -- 2.30.2 diff --git a/Documentation/ABI/testing/debugfs-dell-wmi-ddv b/Documentation/ABI/testing/debugfs-dell-wmi-ddv new file mode 100644 index 000000000000..fbcc5d6f7388 --- /dev/null +++ b/Documentation/ABI/testing/debugfs-dell-wmi-ddv @@ -0,0 +1,21 @@ +What: /sys/kernel/debug/dell-wmi-ddv-/fan_sensor_information +Date: September 2022 +KernelVersion: 6.1 +Contact: Armin Wolf +Description: + This file contains the contents of the fan sensor information buffer, + which contains fan sensor entries and a terminating character (0xFF). + + Each fan sensor entry consists of three bytes with an unknown meaning, + interested people may use this file for reverse-engineering. + +What: /sys/kernel/debug/dell-wmi-ddv-/thermal_sensor_information +Date: September 2022 +KernelVersion: 6.1 +Contact: Armin Wolf +Description: + This file contains the contents of the thermal sensor information buffer, + which contains thermal sensor entries and a terminating character (0xFF). + + Each thermal sensor entry consists of five bytes with an unknown meaning, + interested people may use this file for reverse-engineering. diff --git a/Documentation/ABI/testing/sysfs-platform-dell-wmi-ddv b/Documentation/ABI/testing/sysfs-platform-dell-wmi-ddv new file mode 100644 index 000000000000..98e0b8399d13 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-dell-wmi-ddv @@ -0,0 +1,16 @@ +What: /sys/class/power_supply//temp +Date: September 2022 +KernelVersion: 6.1 +Contact: Armin Wolf +Description: + Reports the current ACPI battery temperature on supported Dell machines. + + Values are represented in 1/10 Degrees Celsius. + +What: /sys/class/power_supply//eppid +Date: September 2022 +KernelVersion: 6.1 +Contact: Armin Wolf +Description: + Reports the Dell ePPID (electronic Dell Piece Part Identification) + of the ACPI battery. diff --git a/MAINTAINERS b/MAINTAINERS index 6bb894ea4a77..d9fd4c9eebbc 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5821,6 +5821,13 @@ L: Dell.Client.Kernel@dell.com S: Maintained F: drivers/platform/x86/dell/dell-wmi-descriptor.c +DELL WMI DDV DRIVER +M: Armin Wolf +S: Maintained +F: Documentation/ABI/testing/debugfs-dell-wmi-ddv +F: Documentation/ABI/testing/sysfs-platform-dell-wmi-ddv +F: drivers/platform/x86/dell/dell-wmi-ddv.c + DELL WMI SYSMAN DRIVER M: Divya Bharathi M: Prasanth Ksr diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/Kconfig index 25421e061c47..209e63e347e2 100644 --- a/drivers/platform/x86/dell/Kconfig +++ b/drivers/platform/x86/dell/Kconfig @@ -189,6 +189,19 @@ config DELL_WMI_DESCRIPTOR default n depends on ACPI_WMI +config DELL_WMI_DDV + tristate "Dell WMI sensors Support" + default m + depends on ACPI_BATTERY + depends on ACPI_WMI + help + This option adds support for WMI-based sensors like + battery temperature sensors found on some Dell notebooks. + It also supports reading of the batteries ePPID. + + To compile this drivers as a module, choose M here: the module will + be called dell-wmi-ddv. + config DELL_WMI_LED tristate "External LED on Dell Business Netbooks" default m diff --git a/drivers/platform/x86/dell/Makefile b/drivers/platform/x86/dell/Makefile index ddba1df71e80..1b8942426622 100644 --- a/drivers/platform/x86/dell/Makefile +++ b/drivers/platform/x86/dell/Makefile @@ -19,5 +19,6 @@ dell-wmi-objs := dell-wmi-base.o dell-wmi-$(CONFIG_DELL_WMI_PRIVACY) += dell-wmi-privacy.o obj-$(CONFIG_DELL_WMI_AIO) += dell-wmi-aio.o obj-$(CONFIG_DELL_WMI_DESCRIPTOR) += dell-wmi-descriptor.o +obj-$(CONFIG_DELL_WMI_DDV) += dell-wmi-ddv.o obj-$(CONFIG_DELL_WMI_LED) += dell-wmi-led.o obj-$(CONFIG_DELL_WMI_SYSMAN) += dell-wmi-sysman/ diff --git a/drivers/platform/x86/dell/dell-wmi-ddv.c b/drivers/platform/x86/dell/dell-wmi-ddv.c new file mode 100644 index 000000000000..6eef298f13eb --- /dev/null +++ b/drivers/platform/x86/dell/dell-wmi-ddv.c @@ -0,0 +1,365 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * dell-wmi-ddv.c -- Linux driver for WMI sensor information on Dell notebooks. + * + * Copyright (C) 2022 Armin Wolf + */ + +#define pr_format(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRIVER_NAME "dell-wmi-ddv" + +#define DELL_DDV_SUPPORTED_INTERFACE 2 +#define DELL_DDV_GUID "8A42EA14-4F2A-FD45-6422-0087F7A7E608" + +enum dell_ddv_method { + DELL_DDV_BATTERY_DESIGN_CAPACITY = 0x01, + DELL_DDV_BATTERY_FULL_CHARGE_CAPACITY = 0x02, + DELL_DDV_BATTERY_MANUFACTURE_NAME = 0x03, + DELL_DDV_BATTERY_MANUFACTURE_DATE = 0x04, + DELL_DDV_BATTERY_SERIAL_NUMBER = 0x05, + DELL_DDV_BATTERY_CHEMISTRY_VALUE = 0x06, + DELL_DDV_BATTERY_TEMPERATURE = 0x07, + DELL_DDV_BATTERY_CURRENT = 0x08, + DELL_DDV_BATTERY_VOLTAGE = 0x09, + DELL_DDV_BATTERY_MANUFACTURER_ACCESS = 0x0A, + DELL_DDV_BATTERY_RELATIVE_CHARGE_STATE = 0x0B, + DELL_DDV_BATTERY_CYCLE_COUNT = 0x0C, + DELL_DDV_BATTERY_EPPID = 0x0D, + DELL_DDV_BATTERY_RAW_ANALYTICS_START = 0x0E, + DELL_DDV_BATTERY_RAW_ANALYTICS = 0x0F, + DELL_DDV_BATTERY_DESIGN_VOLTAGE = 0x10, + + DELL_DDV_INTERFACE_VERSION = 0x12, + + DELL_DDV_FAN_SENSOR_INFORMATION = 0x20, + DELL_DDV_THERMAL_SENSOR_INFORMATION = 0x22, +}; + +struct dell_wmi_ddv_data { + struct device_attribute temp_attr, eppid_attr; + struct wmi_device *wdev; +}; + +static int dell_wmi_ddv_query_type(struct wmi_device *wdev, enum dell_ddv_method method, u32 arg, + union acpi_object **result, acpi_object_type type) +{ + struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; + const struct acpi_buffer in = { + .length = sizeof(arg), + .pointer = &arg, + }; + union acpi_object *obj; + acpi_status ret; + + ret = wmidev_evaluate_method(wdev, 0x0, method, &in, &out); + if (ACPI_FAILURE(ret)) + return -EIO; + + obj = out.pointer; + if (!obj) + return -ENODATA; + + if (obj->type != type) { + kfree(obj); + return -EIO; + } + + *result = obj; + + return 0; +} + +static int dell_wmi_ddv_query_integer(struct wmi_device *wdev, enum dell_ddv_method method, + u32 arg, u32 *res) +{ + union acpi_object *obj; + int ret; + + ret = dell_wmi_ddv_query_type(wdev, method, arg, &obj, ACPI_TYPE_INTEGER); + if (ret < 0) + return ret; + + if (obj->integer.value <= U32_MAX) + *res = (u32)obj->integer.value; + else + ret = -ERANGE; + + kfree(obj); + + return ret; +} + +static int dell_wmi_ddv_query_buffer(struct wmi_device *wdev, enum dell_ddv_method method, + u32 arg, union acpi_object **result) +{ + union acpi_object *obj; + u64 buffer_size; + int ret; + + ret = dell_wmi_ddv_query_type(wdev, method, arg, &obj, ACPI_TYPE_PACKAGE); + if (ret < 0) + return ret; + + if (obj->package.count != 2) + goto err_free; + + if (obj->package.elements[0].type != ACPI_TYPE_INTEGER) + goto err_free; + + buffer_size = obj->package.elements[0].integer.value; + + if (obj->package.elements[1].type != ACPI_TYPE_BUFFER) + goto err_free; + + if (buffer_size != obj->package.elements[1].buffer.length) { + dev_warn(&wdev->dev, + FW_WARN "ACPI buffer size (%llu) does not match WMI buffer size (%d)\n", + buffer_size, obj->package.elements[1].buffer.length); + + goto err_free; + } + + *result = obj; + + return 0; + +err_free: + kfree(obj); + + return -EIO; +} + +static int dell_wmi_ddv_query_string(struct wmi_device *wdev, enum dell_ddv_method method, + u32 arg, union acpi_object **result) +{ + return dell_wmi_ddv_query_type(wdev, method, arg, result, ACPI_TYPE_STRING); +} + +static int dell_wmi_ddv_battery_index(struct acpi_device *acpi_dev, u32 *index) +{ + const char *uid_str = acpi_device_uid(acpi_dev); + + if (!uid_str) + return -ENODEV; + + return kstrtou32(uid_str, 10, index); +} + +static ssize_t temp_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dell_wmi_ddv_data *data = container_of(attr, struct dell_wmi_ddv_data, temp_attr); + u32 index, value; + int ret; + + ret = dell_wmi_ddv_battery_index(to_acpi_device(dev->parent), &index); + if (ret < 0) + return ret; + + ret = dell_wmi_ddv_query_integer(data->wdev, DELL_DDV_BATTERY_TEMPERATURE, index, &value); + if (ret < 0) + return ret; + + return sysfs_emit(buf, "%d\n", DIV_ROUND_CLOSEST(value, 10)); +} + +static ssize_t eppid_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dell_wmi_ddv_data *data = container_of(attr, struct dell_wmi_ddv_data, eppid_attr); + union acpi_object *obj; + u32 index; + int ret; + + ret = dell_wmi_ddv_battery_index(to_acpi_device(dev->parent), &index); + if (ret < 0) + return ret; + + ret = dell_wmi_ddv_query_string(data->wdev, DELL_DDV_BATTERY_EPPID, index, &obj); + if (ret < 0) + return ret; + + ret = sysfs_emit(buf, "%s\n", obj->string.pointer); + + kfree(obj); + + return ret; +} + +static int dell_wmi_ddv_add_battery(void *drvdata, struct power_supply *battery) +{ + struct dell_wmi_ddv_data *data = drvdata; + u32 index; + int ret; + + ret = dell_wmi_ddv_battery_index(to_acpi_device(battery->dev.parent), &index); + if (ret < 0) + return ret; + + ret = device_create_file(&battery->dev, &data->temp_attr); + if (ret < 0) + return ret; + + ret = device_create_file(&battery->dev, &data->eppid_attr); + if (ret < 0) { + device_remove_file(&battery->dev, &data->temp_attr); + + return ret; + } + + return 0; +} + +static int dell_wmi_ddv_remove_battery(void *drvdata, struct power_supply *battery) +{ + struct dell_wmi_ddv_data *data = drvdata; + + device_remove_file(&battery->dev, &data->temp_attr); + device_remove_file(&battery->dev, &data->eppid_attr); + + return 0; +} + +static const struct acpi_battery_hook_ops dell_wmi_ddv_battery_hook_ops = { + .add_battery = dell_wmi_ddv_add_battery, + .remove_battery = dell_wmi_ddv_remove_battery, +}; + +static void dell_wmi_ddv_battery_remove(void *data) +{ + struct acpi_battery_hook *hook = data; + + battery_hook_unregister(hook); +} + +static int dell_wmi_ddv_battery_add(struct dell_wmi_ddv_data *data) +{ + struct acpi_battery_hook *hook; + + sysfs_attr_init(&data->temp_attr.attr); + data->temp_attr.attr.name = "temp"; + data->temp_attr.attr.mode = 0444; + data->temp_attr.show = temp_show; + + sysfs_attr_init(&data->eppid_attr.attr); + data->eppid_attr.attr.name = "eppid"; + data->eppid_attr.attr.mode = 0444; + data->eppid_attr.show = eppid_show; + + hook = battery_hook_register("DELL Battery Extension", data, + &dell_wmi_ddv_battery_hook_ops); + if (IS_ERR(hook)) + return PTR_ERR(hook); + + return devm_add_action_or_reset(&data->wdev->dev, dell_wmi_ddv_battery_remove, hook); +} + +static int dell_wmi_ddv_buffer_read(struct seq_file *seq, enum dell_ddv_method method) +{ + struct device *dev = seq->private; + struct dell_wmi_ddv_data *data = dev_get_drvdata(dev); + union acpi_object *obj; + union acpi_object buf; + int ret; + + ret = dell_wmi_ddv_query_buffer(data->wdev, method, 0, &obj); + if (ret < 0) + return ret; + + buf = obj->package.elements[1]; + ret = seq_write(seq, buf.buffer.pointer, buf.buffer.length); + kfree(obj); + + return ret; +} + +static int dell_wmi_ddv_fan_read(struct seq_file *seq, void *offset) +{ + return dell_wmi_ddv_buffer_read(seq, DELL_DDV_FAN_SENSOR_INFORMATION); +} + +static int dell_wmi_ddv_temp_read(struct seq_file *seq, void *offset) +{ + return dell_wmi_ddv_buffer_read(seq, DELL_DDV_THERMAL_SENSOR_INFORMATION); +} + +static void dell_wmi_ddv_debugfs_remove(void *data) +{ + struct dentry *entry = data; + + debugfs_remove(entry); +} + +static void dell_wmi_ddv_debugfs_init(struct wmi_device *wdev) +{ + struct dentry *entry; + char name[64]; + + scnprintf(name, ARRAY_SIZE(name), "%s-%s", DRIVER_NAME, dev_name(&wdev->dev)); + entry = debugfs_create_dir(name, NULL); + + debugfs_create_devm_seqfile(&wdev->dev, "fan_sensor_information", entry, + dell_wmi_ddv_fan_read); + debugfs_create_devm_seqfile(&wdev->dev, "thermal_sensor_information", entry, + dell_wmi_ddv_temp_read); + + devm_add_action_or_reset(&wdev->dev, dell_wmi_ddv_debugfs_remove, entry); +} + +static int dell_wmi_ddv_probe(struct wmi_device *wdev, const void *context) +{ + struct dell_wmi_ddv_data *data; + u32 version; + int ret; + + ret = dell_wmi_ddv_query_integer(wdev, DELL_DDV_INTERFACE_VERSION, 0, &version); + if (ret < 0) + return ret; + + dev_dbg(&wdev->dev, "WMI interface version: %d\n", version); + if (version != DELL_DDV_SUPPORTED_INTERFACE) + return -ENODEV; + + data = devm_kzalloc(&wdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + dev_set_drvdata(&wdev->dev, data); + data->wdev = wdev; + + dell_wmi_ddv_debugfs_init(wdev); + + return dell_wmi_ddv_battery_add(data); +} + +static const struct wmi_device_id dell_wmi_ddv_id_table[] = { + { DELL_DDV_GUID, NULL }, + { } +}; +MODULE_DEVICE_TABLE(wmi, dell_wmi_ddv_id_table); + +static struct wmi_driver dell_wmi_ddv_driver = { + .driver = { + .name = DRIVER_NAME, + }, + .id_table = dell_wmi_ddv_id_table, + .probe = dell_wmi_ddv_probe, +}; +module_wmi_driver(dell_wmi_ddv_driver); + +MODULE_AUTHOR("Armin Wolf "); +MODULE_DESCRIPTION("Dell WMI sensor driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index aff23309b5d3..f307d8c5c6c3 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -108,6 +108,7 @@ MODULE_DEVICE_TABLE(acpi, wmi_device_ids); /* allow duplicate GUIDs as these device drivers use struct wmi_driver */ static const char * const allow_duplicates[] = { "05901221-D566-11D1-B2F0-00A0C9062910", /* wmi-bmof */ + "8A42EA14-4F2A-FD45-6422-0087F7A7E608", /* dell-wmi-ddv */ NULL };