1 /* $NetBSD: acpi_usb.c,v 1.2 2021/01/14 14:38:22 thorpej 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 1.2 2021/01/14 14:38:22 thorpej 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) */
48 static 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
53 void
acpi_usb_post_reset(ACPI_HANDLE handle)54 acpi_usb_post_reset(ACPI_HANDLE handle)
55 {
56
57 /*
58 * Invoke the _DSM control method for post-reset processing function
59 * for dual-role USB controllers. If supported, this will perform any
60 * controller-specific initialization required to put the dual-role
61 * device into host mode.
62 */
63
64 (void)acpi_dsm(handle, ehci_acpi_dsm_uuid, 0, 1, NULL, NULL);
65 }
66