1 /* $NetBSD: linux_acpi.c,v 1.1 2022/02/27 14:22:21 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2022 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: linux_acpi.c,v 1.1 2022/02/27 14:22:21 riastradh Exp $"); 31 32 #include <linux/acpi.h> 33 34 union acpi_object * 35 acpi_evaluate_dsm(acpi_handle handle, const guid_t *uuid, u64 rev, u64 func, 36 union acpi_object *argv4) 37 { 38 ACPI_OBJECT_LIST arg; 39 ACPI_OBJECT params[4]; 40 ACPI_BUFFER buf; 41 ACPI_STATUS rv; 42 43 if (handle == NULL) 44 handle = ACPI_ROOT_OBJECT; 45 46 arg.Count = 4; 47 arg.Pointer = params; 48 params[0].Type = ACPI_TYPE_BUFFER; 49 params[0].Buffer.Length = 16; 50 params[0].Buffer.Pointer = (char *)__UNCONST(uuid); 51 params[1].Type = ACPI_TYPE_INTEGER; 52 params[1].Integer.Value = rev; 53 params[2].Type = ACPI_TYPE_INTEGER; 54 params[2].Integer.Value = func; 55 if (argv4 != NULL) { 56 params[3] = *argv4; 57 } else { 58 params[3].Type = ACPI_TYPE_PACKAGE; 59 params[3].Package.Count = 0; 60 params[3].Package.Elements = NULL; 61 } 62 63 buf.Pointer = NULL; 64 buf.Length = ACPI_ALLOCATE_LOCAL_BUFFER; 65 66 rv = AcpiEvaluateObject(handle, "_DSM", &arg, &buf); 67 if (ACPI_SUCCESS(rv)) 68 return (ACPI_OBJECT *)buf.Pointer; 69 return NULL; 70 } 71 72 union acpi_object * 73 acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *uuid, u64 rev, 74 u64 func, union acpi_object *argv4, acpi_object_type type) 75 { 76 union acpi_object *obj; 77 78 obj = acpi_evaluate_dsm(handle, uuid, rev, func, argv4); 79 if (obj != NULL && obj->Type != type) { 80 ACPI_FREE(obj); 81 obj = NULL; 82 } 83 return obj; 84 } 85 86 #define ACPI_INIT_DSM_ARGV4(cnt, eles) \ 87 { \ 88 .Package.Type = ACPI_TYPE_PACKAGE, \ 89 .Package.Count = (cnt), \ 90 .Package.Elements = (eles) \ 91 } 92 93 bool 94 acpi_check_dsm(acpi_handle handle, const guid_t *uuid, u64 rev, u64 funcs) 95 { 96 ACPI_OBJECT *obj; 97 uint64_t mask = 0; 98 int i; 99 100 if (funcs == 0) 101 return false; 102 103 obj = acpi_evaluate_dsm(handle, uuid, rev, 0, NULL); 104 if (obj == NULL) 105 return false; 106 107 if (obj->Type == ACPI_TYPE_INTEGER) 108 mask = obj->Integer.Value; 109 else if (obj->Type == ACPI_TYPE_BUFFER) 110 for (i = 0; i < obj->Buffer.Length && i < 8; i++) 111 mask |= (uint64_t)obj->Buffer.Pointer[i] << (i * 8); 112 ACPI_FREE(obj); 113 114 if ((mask & 0x1) == 0x1 && (mask & funcs) == funcs) 115 return true; 116 return false; 117 } 118