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) */ 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 54 acpi_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