Home | History | Annotate | Line # | Download | only in acpi
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 (at) 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