xref: /freebsd/sys/dev/acpica/acpi_package.c (revision 3157ba21)
1 /*-
2  * Copyright (c) 2003 Nate Lawson
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/bus.h>
33 #include <sys/sbuf.h>
34 
35 #include <machine/bus.h>
36 #include <machine/resource.h>
37 #include <sys/rman.h>
38 
39 #include <contrib/dev/acpica/include/acpi.h>
40 
41 #include <dev/acpica/acpivar.h>
42 
43 /*
44  * Package manipulation convenience functions
45  */
46 
47 int
48 acpi_PkgInt(ACPI_OBJECT *res, int idx, UINT64 *dst)
49 {
50     ACPI_OBJECT		*obj;
51 
52     obj = &res->Package.Elements[idx];
53     if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER)
54 	return (EINVAL);
55     *dst = obj->Integer.Value;
56 
57     return (0);
58 }
59 
60 int
61 acpi_PkgInt32(ACPI_OBJECT *res, int idx, uint32_t *dst)
62 {
63     UINT64		tmp;
64     int			error;
65 
66     error = acpi_PkgInt(res, idx, &tmp);
67     if (error == 0)
68 	*dst = (uint32_t)tmp;
69 
70     return (error);
71 }
72 
73 int
74 acpi_PkgStr(ACPI_OBJECT *res, int idx, void *dst, size_t size)
75 {
76     ACPI_OBJECT		*obj;
77     void		*ptr;
78     size_t		 length;
79 
80     obj = &res->Package.Elements[idx];
81     if (obj == NULL)
82 	return (EINVAL);
83     bzero(dst, sizeof(dst));
84 
85     switch (obj->Type) {
86     case ACPI_TYPE_STRING:
87 	ptr = obj->String.Pointer;
88 	length = obj->String.Length;
89 	break;
90     case ACPI_TYPE_BUFFER:
91 	ptr = obj->Buffer.Pointer;
92 	length = obj->Buffer.Length;
93 	break;
94     default:
95 	return (EINVAL);
96     }
97 
98     /* Make sure string will fit, including terminating NUL */
99     if (++length > size)
100 	return (E2BIG);
101 
102     strlcpy(dst, ptr, length);
103     return (0);
104 }
105 
106 int
107 acpi_PkgGas(device_t dev, ACPI_OBJECT *res, int idx, int *type, int *rid,
108     struct resource **dst, u_int flags)
109 {
110     ACPI_GENERIC_ADDRESS gas;
111     ACPI_OBJECT *obj;
112 
113     obj = &res->Package.Elements[idx];
114     if (obj == NULL || obj->Type != ACPI_TYPE_BUFFER ||
115 	obj->Buffer.Length < sizeof(ACPI_GENERIC_ADDRESS) + 3)
116 	return (EINVAL);
117 
118     memcpy(&gas, obj->Buffer.Pointer + 3, sizeof(gas));
119 
120     return (acpi_bus_alloc_gas(dev, type, rid, &gas, dst, flags));
121 }
122 
123 ACPI_HANDLE
124 acpi_GetReference(ACPI_HANDLE scope, ACPI_OBJECT *obj)
125 {
126     ACPI_HANDLE h;
127 
128     if (obj == NULL)
129 	return (NULL);
130 
131     switch (obj->Type) {
132     case ACPI_TYPE_LOCAL_REFERENCE:
133     case ACPI_TYPE_ANY:
134 	h = obj->Reference.Handle;
135 	break;
136     case ACPI_TYPE_STRING:
137 	/*
138 	 * The String object usually contains a fully-qualified path, so
139 	 * scope can be NULL.
140 	 *
141 	 * XXX This may not always be the case.
142 	 */
143 	if (ACPI_FAILURE(AcpiGetHandle(scope, obj->String.Pointer, &h)))
144 	    h = NULL;
145 	break;
146     default:
147 	h = NULL;
148 	break;
149     }
150 
151     return (h);
152 }
153