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Wed, 08 Apr 2026 04:18:11 -0700 (PDT) Received: from localhost ([2402:7500:404:94a3:bc1:db3:c7d7:391]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b274779b48sm280006375ad.25.2026.04.08.04.18.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Apr 2026 04:18:10 -0700 (PDT) From: Jack Wu X-Google-Original-From: Jack Wu To: Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Cc: platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] platform/x86: dell-dw5826e: Add reset driver for DW5826e Date: Wed, 8 Apr 2026 19:17:38 +0800 Message-Id: <20260408111738.232040-1-jackbb_wu@compal.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If the DW5826e is in a frozen state and unable to receive USB commands, this driver provides a method for the user to reset the DW5826e via ACPI. Signed-off-by: Jack Wu --- drivers/platform/x86/dell/Kconfig | 6 + drivers/platform/x86/dell/Makefile | 2 + .../platform/x86/dell/dell-dw5826e-reset.c | 120 ++++++++++++++++++ 3 files changed, 128 insertions(+) create mode 100644 drivers/platform/x86/dell/dell-dw5826e-reset.c diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/= Kconfig index 738c108c2163..c4540c837a88 100644 --- a/drivers/platform/x86/dell/Kconfig +++ b/drivers/platform/x86/dell/Kconfig @@ -276,4 +276,10 @@ config DELL_WMI_SYSMAN To compile this driver as a module, choose M here: the module will be called dell-wmi-sysman. =20 +config DELL_DW5826E_RESET + tristate "Dell DW5826e PLDR reset support" + default m + depends on ACPI + help + This adds support for the Dell DW5826e PLDR reset via ACPI endif # X86_PLATFORM_DRIVERS_DELL diff --git a/drivers/platform/x86/dell/Makefile b/drivers/platform/x86/dell= /Makefile index c7501c25e627..8150283cfd1d 100644 --- a/drivers/platform/x86/dell/Makefile +++ b/drivers/platform/x86/dell/Makefile @@ -28,3 +28,5 @@ obj-$(CONFIG_DELL_WMI_DESCRIPTOR) +=3D dell-wmi-descript= or.o obj-$(CONFIG_DELL_WMI_DDV) +=3D dell-wmi-ddv.o obj-$(CONFIG_DELL_WMI_LED) +=3D dell-wmi-led.o obj-$(CONFIG_DELL_WMI_SYSMAN) +=3D dell-wmi-sysman/ +obj-$(CONFIG_DELL_DW5826E_RESET) +=3D dell-dw5826e-reset.o + diff --git a/drivers/platform/x86/dell/dell-dw5826e-reset.c b/drivers/platf= orm/x86/dell/dell-dw5826e-reset.c new file mode 100644 index 000000000000..28865a123c63 --- /dev/null +++ b/drivers/platform/x86/dell/dell-dw5826e-reset.c @@ -0,0 +1,120 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * dell-dw5826e-reset.c - Dell DW5826e reset driver + * + * Copyright (C) 2026 Jackbb Wu + * + */ + +#include +#include +#include +#include +#include +#include + +static guid_t palc_dsm_guid =3D + GUID_INIT(0x5a1a4bba, 0x8006, 0x487e, 0xbe, 0x0a, 0xac, 0xf5, 0xd8, 0xfd,= 0xfe, 0x59); + +struct palc_dev { + struct device *dev; + acpi_handle handle; + struct miscdevice miscdev; +}; + +static int trigger_palc_pldr(struct palc_dev *palc) +{ + union acpi_object *obj; + + dev_info(palc->dev, "Triggering PLDR via ACPI _DSM Function 1...\n"); + + obj =3D acpi_evaluate_dsm(palc->handle, &palc_dsm_guid, 1, 1, NULL); + + if (!obj) { + dev_err(palc->dev, "Failed to evaluate _DSM\n"); + return -EIO; + } + + if (obj->type =3D=3D ACPI_TYPE_BUFFER) + dev_info(palc->dev, "PLDR _DSM executed successfully\n"); + + ACPI_FREE(obj); + return 0; +} + +static ssize_t palc_write(struct file *filp, const char __user *buf, size_= t count, loff_t *ppos) +{ + struct palc_dev *palc =3D filp->private_data; + + trigger_palc_pldr(palc); + + return count; +} + +static int palc_open(struct inode *inode, struct file *filp) +{ + struct palc_dev *palc =3D container_of(filp->private_data, struct palc_de= v, miscdev); + + filp->private_data =3D palc; + return 0; +} + +static const struct file_operations palc_fops =3D { + .owner =3D THIS_MODULE, + .open =3D palc_open, + .write =3D palc_write, +}; + +static int palc_acpi_probe(struct acpi_device *adev) +{ + struct palc_dev *palc; + + palc =3D devm_kzalloc(&adev->dev, sizeof(*palc), GFP_KERNEL); + if (!palc) + return -ENOMEM; + + palc->dev =3D &adev->dev; + palc->handle =3D adev->handle; + + palc->miscdev.minor =3D MISC_DYNAMIC_MINOR; + palc->miscdev.name =3D "reset_palc"; + palc->miscdev.fops =3D &palc_fops; + palc->miscdev.parent =3D &adev->dev; + + if (misc_register(&palc->miscdev)) + return -EINVAL; + + dev_set_drvdata(&adev->dev, palc); + + dev_info(&adev->dev, "DW5826e Reset Device (PALC0001) Driver Loaded\n"); + return 0; +} + +static void palc_acpi_remove(struct acpi_device *adev) +{ + struct palc_dev *palc =3D dev_get_drvdata(&adev->dev); + + if (palc) + misc_deregister(&palc->miscdev); +} + +static const struct acpi_device_id palc_acpi_ids[] =3D { + { "PALC0001", 0 }, + { "", 0 } +}; + +static struct acpi_driver palc_acpi_driver =3D { + .name =3D "palc_reset", + .ids =3D palc_acpi_ids, + .ops =3D { + .add =3D palc_acpi_probe, + .remove =3D palc_acpi_remove, + }, +}; + +MODULE_DEVICE_TABLE(acpi, palc_acpi_ids); +module_acpi_driver(palc_acpi_driver); + +MODULE_DESCRIPTION("Dell DW5826e reset driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("JackBB Wu"); --=20 2.34.1