acpi_usb.c revision 1.1 
1/* $NetBSD: acpi_usb.c,v 1.1 2018/10/26 23:33:38 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2018 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jared McNeill <jmcneill@invisible.ca>.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * USB Device-Specific Method (_DSM) support:
34 *
35 * https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/usb-device-specific-method---dsm-
36 */
37
38#include <sys/cdefs.h>
39__KERNEL_RCSID(0, "$NetBSD: acpi_usb.c,v 1.1 2018/10/26 23:33:38 jmcneill Exp $");
40
41#include <sys/param.h>
42
43#include <dev/acpi/acpireg.h>
44#include <dev/acpi/acpivar.h>
45#include <dev/acpi/acpi_usb.h>
46
47/* Windows-defined USB subsystem device-specific method (_DSM) */
48static UINT8 ehci_acpi_dsm_uuid[ACPI_UUID_LENGTH] = {
49	0x85, 0xe3, 0x2e, 0xce, 0xe6, 0x00, 0xcb, 0x48,
50	0x9f, 0x05, 0x2e, 0xdb, 0x92, 0x7c, 0x48, 0x99
51};
52
53void
54acpi_usb_post_reset(ACPI_HANDLE handle)
55{
56	ACPI_OBJECT_LIST objs;
57	ACPI_OBJECT obj[4];
58	ACPI_HANDLE method;
59
60	/*
61	 * Invoke the _DSM control method for post-reset processing function
62	 * for dual-role USB controllers. If supported, this will perform any
63	 * controller-specific initialization required to put the dual-role
64	 * device into host mode.
65	 */
66
67	objs.Count = 4;
68	objs.Pointer = obj;
69	obj[0].Type = ACPI_TYPE_BUFFER;
70	obj[0].Buffer.Length = ACPI_UUID_LENGTH;
71	obj[0].Buffer.Pointer = ehci_acpi_dsm_uuid;
72	obj[1].Type = ACPI_TYPE_INTEGER;
73	obj[1].Integer.Value = 0;	/* Revision ID = 0 */
74	obj[2].Type = ACPI_TYPE_INTEGER;
75	obj[2].Integer.Value = 1;	/* Function index = 1 */
76	obj[3].Type = ACPI_TYPE_PACKAGE;
77	obj[3].Package.Count = 0;	/* Empty package (not used) */
78	obj[3].Package.Elements = NULL;
79
80	if (ACPI_FAILURE(AcpiGetHandle(handle, "_DSM", &method)))
81		return;
82
83	(void)AcpiEvaluateObject(method, NULL, &objs, NULL);
84}
85