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      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 (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 1.2 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
     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