85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/* $NetBSD: acpi_usb.c,v 1.1 2018/10/26 23:33:38 jmcneill Exp $ */
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/*-
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* Copyright (c) 2018 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jared McNeill <jmcneill@invisible.ca>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* USB Device-Specific Method (_DSM) support:
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*
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* https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/usb-device-specific-method---dsm-
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: acpi_usb.c,v 1.1 2018/10/26 23:33:38 jmcneill Exp $");
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#include <sys/param.h>
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#include <dev/acpi/acpireg.h>
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#include <dev/acpi/acpivar.h>
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#include <dev/acpi/acpi_usb.h>
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/* Windows-defined USB subsystem device-specific method (_DSM) */
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static UINT8 ehci_acpi_dsm_uuid[ACPI_UUID_LENGTH] = {
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0x85, 0xe3, 0x2e, 0xce, 0xe6, 0x00, 0xcb, 0x48,
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0x9f, 0x05, 0x2e, 0xdb, 0x92, 0x7c, 0x48, 0x99
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};
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void
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acpi_usb_post_reset(ACPI_HANDLE handle)
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{
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ACPI_OBJECT_LIST objs;
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ACPI_OBJECT obj[4];
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ACPI_HANDLE method;
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/*
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* Invoke the _DSM control method for post-reset processing function
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* for dual-role USB controllers. If supported, this will perform any
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* controller-specific initialization required to put the dual-role
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* device into host mode.
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*/
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objs.Count = 4;
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objs.Pointer = obj;
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obj[0].Type = ACPI_TYPE_BUFFER;
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obj[0].Buffer.Length = ACPI_UUID_LENGTH;
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obj[0].Buffer.Pointer = ehci_acpi_dsm_uuid;
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obj[1].Type = ACPI_TYPE_INTEGER;
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obj[1].Integer.Value = 0; /* Revision ID = 0 */
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obj[2].Type = ACPI_TYPE_INTEGER;
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obj[2].Integer.Value = 1; /* Function index = 1 */
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obj[3].Type = ACPI_TYPE_PACKAGE;
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obj[3].Package.Count = 0; /* Empty package (not used) */
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obj[3].Package.Elements = NULL;
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if (ACPI_FAILURE(AcpiGetHandle(handle, "_DSM", &method)))
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return;
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(void)AcpiEvaluateObject(method, NULL, &objs, NULL);
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}
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