1 /* $NetBSD: linux_acpi.c,v 1.2 2022/02/28 17:15:30 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 1.2 2022/02/28 17:15:30 riastradh Exp $");
31
32 #include <dev/acpi/acpireg.h>
33
34 #include <linux/acpi.h>
35
36 #define _COMPONENT ACPI_BUS_COMPONENT
37 ACPI_MODULE_NAME("linux_acpi")
38
39 union acpi_object *
acpi_evaluate_dsm(acpi_handle handle,const guid_t * uuid,u64 rev,u64 func,union acpi_object * argv4)40 acpi_evaluate_dsm(acpi_handle handle, const guid_t *uuid, u64 rev, u64 func,
41 union acpi_object *argv4)
42 {
43 ACPI_OBJECT_LIST arg;
44 ACPI_OBJECT params[4];
45 ACPI_BUFFER buf;
46 ACPI_STATUS rv;
47
48 if (handle == NULL)
49 handle = ACPI_ROOT_OBJECT;
50
51 arg.Count = 4;
52 arg.Pointer = params;
53 params[0].Type = ACPI_TYPE_BUFFER;
54 params[0].Buffer.Length = 16;
55 params[0].Buffer.Pointer = (char *)__UNCONST(uuid);
56 params[1].Type = ACPI_TYPE_INTEGER;
57 params[1].Integer.Value = rev;
58 params[2].Type = ACPI_TYPE_INTEGER;
59 params[2].Integer.Value = func;
60 if (argv4 != NULL) {
61 params[3] = *argv4;
62 } else {
63 params[3].Type = ACPI_TYPE_PACKAGE;
64 params[3].Package.Count = 0;
65 params[3].Package.Elements = NULL;
66 }
67
68 buf.Pointer = NULL;
69 buf.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
70
71 rv = AcpiEvaluateObject(handle, "_DSM", &arg, &buf);
72 if (ACPI_SUCCESS(rv))
73 return (ACPI_OBJECT *)buf.Pointer;
74 return NULL;
75 }
76
77 union acpi_object *
acpi_evaluate_dsm_typed(acpi_handle handle,const guid_t * uuid,u64 rev,u64 func,union acpi_object * argv4,acpi_object_type type)78 acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *uuid, u64 rev,
79 u64 func, union acpi_object *argv4, acpi_object_type type)
80 {
81 union acpi_object *obj;
82
83 obj = acpi_evaluate_dsm(handle, uuid, rev, func, argv4);
84 if (obj != NULL && obj->Type != type) {
85 ACPI_FREE(obj);
86 obj = NULL;
87 }
88 return obj;
89 }
90
91 #define ACPI_INIT_DSM_ARGV4(cnt, eles) \
92 { \
93 .Package.Type = ACPI_TYPE_PACKAGE, \
94 .Package.Count = (cnt), \
95 .Package.Elements = (eles) \
96 }
97
98 bool
acpi_check_dsm(acpi_handle handle,const guid_t * uuid,u64 rev,u64 funcs)99 acpi_check_dsm(acpi_handle handle, const guid_t *uuid, u64 rev, u64 funcs)
100 {
101 ACPI_OBJECT *obj;
102 uint64_t mask = 0;
103 int i;
104
105 if (funcs == 0)
106 return false;
107
108 obj = acpi_evaluate_dsm(handle, uuid, rev, 0, NULL);
109 if (obj == NULL)
110 return false;
111
112 if (obj->Type == ACPI_TYPE_INTEGER)
113 mask = obj->Integer.Value;
114 else if (obj->Type == ACPI_TYPE_BUFFER)
115 for (i = 0; i < obj->Buffer.Length && i < 8; i++)
116 mask |= (uint64_t)obj->Buffer.Pointer[i] << (i * 8);
117 ACPI_FREE(obj);
118
119 if ((mask & 0x1) == 0x1 && (mask & funcs) == funcs)
120 return true;
121 return false;
122 }
123