From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751994AbdIFRzk (ORCPT ); Wed, 6 Sep 2017 13:55:40 -0400 Received: from esa3.dell-outbound.iphmx.com ([68.232.153.94]:48187 "EHLO esa3.dell-outbound.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750739AbdIFRzi (ORCPT ); Wed, 6 Sep 2017 13:55:38 -0400 X-LoopCount0: from 10.208.86.39 X-IronPort-AV: E=Sophos;i="5.42,354,1500958800"; d="scan'208";a="58416145" X-DLP: DLP_GlobalPCIDSS From: Mario Limonciello To: dvhart@infradead.org Cc: LKML , platform-driver-x86@vger.kernel.org, Richard Hughes , Yehezkel Bernat , Mika Westerberg , Mario Limonciello Subject: [PATCH] Add driver to force WMI Thunderbolt controller power status Date: Wed, 6 Sep 2017 12:54:00 -0500 Message-Id: <1504720440-24423-1-git-send-email-mario.limonciello@dell.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Current implementations of Intel Thunderbolt controllers will go into a low power mode when not in use. Many machines containing these controllers also have a GPIO wired up that can force the controller awake. This is offered via a ACPI-WMI interface intended to be manipulated by a userspace utility. This mechanism is provided by Intel to OEMs to include in BIOS. It uses an industry wide GUID that is populated in a separate _WDG entry with no binary MOF. This interface allow software such as fwupd to wake up thunderbolt controllers to query the firmware version or flash new firmware. Signed-off-by: Mario Limonciello --- MAINTAINERS | 5 ++ drivers/platform/x86/Kconfig | 13 ++++ drivers/platform/x86/Makefile | 1 + drivers/platform/x86/intel-wmi-thunderbolt.c | 97 ++++++++++++++++++++++++++++ 4 files changed, 116 insertions(+) create mode 100644 drivers/platform/x86/intel-wmi-thunderbolt.c diff --git a/MAINTAINERS b/MAINTAINERS index 1c3feff..375bea9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3949,6 +3949,11 @@ M: Pali Rohár S: Maintained F: drivers/platform/x86/dell-wmi.c +INTEL WMI THUNDERBOLT DRIVER +M: Mario Limonciello +S: Maintained +F: drivers/platform/x86/intel-wmi-thunderbolt.c + DELTA ST MEDIA DRIVER M: Hugues Fruchet L: linux-media@vger.kernel.org diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 80b8795..6670a8d 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -658,6 +658,19 @@ config WMI_BMOF To compile this driver as a module, choose M here: the module will be called wmi-bmof. +config INTEL_WMI_THUNDERBOLT + tristate "Intel WMI thunderbolt driver" + depends on ACPI_WMI + default ACPI_WMI + ---help--- + Say Y here if you want to be able to use the WMI interface on select + systems to force the power control of Intel Thunderbolt controllers. + This is useful for updating the firmware when devices are not plugged + into the controller. + + To compile this driver as a module, choose M here: the module will + be called intel-wmi-thunderbolt. + config MSI_WMI tristate "MSI WMI extras" depends on ACPI_WMI diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 91cec17..2b315d0 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -39,6 +39,7 @@ obj-$(CONFIG_PEAQ_WMI) += peaq-wmi.o obj-$(CONFIG_SURFACE3_WMI) += surface3-wmi.o obj-$(CONFIG_TOPSTAR_LAPTOP) += topstar-laptop.o obj-$(CONFIG_WMI_BMOF) += wmi-bmof.o +obj-$(CONFIG_INTEL_WMI_THUNDERBOLT) += intel-wmi-thunderbolt.o # toshiba_acpi must link after wmi to ensure that wmi devices are found # before toshiba_acpi initializes diff --git a/drivers/platform/x86/intel-wmi-thunderbolt.c b/drivers/platform/x86/intel-wmi-thunderbolt.c new file mode 100644 index 0000000..98f60f2 --- /dev/null +++ b/drivers/platform/x86/intel-wmi-thunderbolt.c @@ -0,0 +1,97 @@ +/* + * WMI Thunderbolt driver + * + * Copyright (C) 2017 Dell Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define INTEL_WMI_THUNDERBOLT_GUID "86CCFD48-205E-4A77-9C48-2021CBEDE341" + + +static ssize_t force_power_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct acpi_buffer input; + acpi_status status; + u8 mode; + + input.length = (acpi_size) (sizeof(u8)); + input.pointer = &mode; + mode = hex_to_bin(buf[0]); + if (mode == 0 || mode == 1) { + status = wmi_evaluate_method(INTEL_WMI_THUNDERBOLT_GUID, 0, 1, + &input, NULL); + if (ACPI_FAILURE(status)) { + pr_err("intel-wmi-thunderbolt: failed setting %s\n", + buf); + return -ENODEV; + } + } else { + pr_err("intel-wmi-thunderbolt: unsupported mode: %d", mode); + } + return count; +} + +static DEVICE_ATTR_WO(force_power); + +static struct attribute *tbt_attrs[] = { + &dev_attr_force_power.attr, + NULL +}; + +static const struct attribute_group tbt_attribute_group = { + .attrs = tbt_attrs, +}; + +static int intel_wmi_thunderbolt_probe(struct wmi_device *wdev) +{ + return sysfs_create_group(&wdev->dev.kobj, &tbt_attribute_group); +} + +static int intel_wmi_thunderbolt_remove(struct wmi_device *wdev) +{ + sysfs_remove_group(&wdev->dev.kobj, &tbt_attribute_group); + return 0; +} + +static const struct wmi_device_id intel_wmi_thunderbolt_id_table[] = { + { .guid_string = INTEL_WMI_THUNDERBOLT_GUID }, + { }, +}; + +static struct wmi_driver intel_wmi_thunderbolt_driver = { + .driver = { + .name = "intel-wmi-thunderbolt", + }, + .probe = intel_wmi_thunderbolt_probe, + .remove = intel_wmi_thunderbolt_remove, + .id_table = intel_wmi_thunderbolt_id_table, +}; + +module_wmi_driver(intel_wmi_thunderbolt_driver); + +MODULE_ALIAS("wmi:" INTEL_WMI_THUNDERBOLT_GUID); +MODULE_AUTHOR("Mario Limonciello "); +MODULE_DESCRIPTION("Intel WMI Thunderbolt force power driver"); +MODULE_LICENSE("GPL"); -- 2.7.4