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ffef6827 LM |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: utxfmutex - external AML mutex access functions | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
77848130 | 8 | * Copyright (C) 2000 - 2012, Intel Corp. |
ffef6827 LM |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
44 | #include <acpi/acpi.h> | |
45 | #include "accommon.h" | |
46 | #include "acnamesp.h" | |
47 | ||
48 | #define _COMPONENT ACPI_UTILITIES | |
49 | ACPI_MODULE_NAME("utxfmutex") | |
50 | ||
51 | /* Local prototypes */ | |
52 | static acpi_status | |
53 | acpi_ut_get_mutex_object(acpi_handle handle, | |
54 | acpi_string pathname, | |
55 | union acpi_operand_object **ret_obj); | |
56 | ||
57 | /******************************************************************************* | |
58 | * | |
59 | * FUNCTION: acpi_ut_get_mutex_object | |
60 | * | |
61 | * PARAMETERS: Handle - Mutex or prefix handle (optional) | |
62 | * Pathname - Mutex pathname (optional) | |
63 | * ret_obj - Where the mutex object is returned | |
64 | * | |
65 | * RETURN: Status | |
66 | * | |
67 | * DESCRIPTION: Get an AML mutex object. The mutex node is pointed to by | |
68 | * Handle:Pathname. Either Handle or Pathname can be NULL, but | |
69 | * not both. | |
70 | * | |
71 | ******************************************************************************/ | |
72 | ||
73 | static acpi_status | |
74 | acpi_ut_get_mutex_object(acpi_handle handle, | |
75 | acpi_string pathname, | |
76 | union acpi_operand_object **ret_obj) | |
77 | { | |
78 | struct acpi_namespace_node *mutex_node; | |
79 | union acpi_operand_object *mutex_obj; | |
80 | acpi_status status; | |
81 | ||
82 | /* Parameter validation */ | |
83 | ||
84 | if (!ret_obj || (!handle && !pathname)) { | |
85 | return (AE_BAD_PARAMETER); | |
86 | } | |
87 | ||
88 | /* Get a the namespace node for the mutex */ | |
89 | ||
90 | mutex_node = handle; | |
91 | if (pathname != NULL) { | |
92 | status = acpi_get_handle(handle, pathname, | |
93 | ACPI_CAST_PTR(acpi_handle, | |
94 | &mutex_node)); | |
95 | if (ACPI_FAILURE(status)) { | |
96 | return (status); | |
97 | } | |
98 | } | |
99 | ||
100 | /* Ensure that we actually have a Mutex object */ | |
101 | ||
102 | if (!mutex_node || (mutex_node->type != ACPI_TYPE_MUTEX)) { | |
103 | return (AE_TYPE); | |
104 | } | |
105 | ||
106 | /* Get the low-level mutex object */ | |
107 | ||
108 | mutex_obj = acpi_ns_get_attached_object(mutex_node); | |
109 | if (!mutex_obj) { | |
110 | return (AE_NULL_OBJECT); | |
111 | } | |
112 | ||
113 | *ret_obj = mutex_obj; | |
114 | return (AE_OK); | |
115 | } | |
116 | ||
117 | /******************************************************************************* | |
118 | * | |
119 | * FUNCTION: acpi_acquire_mutex | |
120 | * | |
121 | * PARAMETERS: Handle - Mutex or prefix handle (optional) | |
122 | * Pathname - Mutex pathname (optional) | |
123 | * Timeout - Max time to wait for the lock (millisec) | |
124 | * | |
125 | * RETURN: Status | |
126 | * | |
127 | * DESCRIPTION: Acquire an AML mutex. This is a device driver interface to | |
128 | * AML mutex objects, and allows for transaction locking between | |
129 | * drivers and AML code. The mutex node is pointed to by | |
130 | * Handle:Pathname. Either Handle or Pathname can be NULL, but | |
131 | * not both. | |
132 | * | |
133 | ******************************************************************************/ | |
134 | ||
135 | acpi_status | |
136 | acpi_acquire_mutex(acpi_handle handle, acpi_string pathname, u16 timeout) | |
137 | { | |
138 | acpi_status status; | |
139 | union acpi_operand_object *mutex_obj; | |
140 | ||
141 | /* Get the low-level mutex associated with Handle:Pathname */ | |
142 | ||
143 | status = acpi_ut_get_mutex_object(handle, pathname, &mutex_obj); | |
144 | if (ACPI_FAILURE(status)) { | |
145 | return (status); | |
146 | } | |
147 | ||
148 | /* Acquire the OS mutex */ | |
149 | ||
150 | status = acpi_os_acquire_mutex(mutex_obj->mutex.os_mutex, timeout); | |
151 | return (status); | |
152 | } | |
153 | ||
154 | /******************************************************************************* | |
155 | * | |
156 | * FUNCTION: acpi_release_mutex | |
157 | * | |
158 | * PARAMETERS: Handle - Mutex or prefix handle (optional) | |
159 | * Pathname - Mutex pathname (optional) | |
160 | * | |
161 | * RETURN: Status | |
162 | * | |
163 | * DESCRIPTION: Release an AML mutex. This is a device driver interface to | |
164 | * AML mutex objects, and allows for transaction locking between | |
165 | * drivers and AML code. The mutex node is pointed to by | |
166 | * Handle:Pathname. Either Handle or Pathname can be NULL, but | |
167 | * not both. | |
168 | * | |
169 | ******************************************************************************/ | |
170 | ||
171 | acpi_status acpi_release_mutex(acpi_handle handle, acpi_string pathname) | |
172 | { | |
173 | acpi_status status; | |
174 | union acpi_operand_object *mutex_obj; | |
175 | ||
176 | /* Get the low-level mutex associated with Handle:Pathname */ | |
177 | ||
178 | status = acpi_ut_get_mutex_object(handle, pathname, &mutex_obj); | |
179 | if (ACPI_FAILURE(status)) { | |
180 | return (status); | |
181 | } | |
182 | ||
183 | /* Release the OS mutex */ | |
184 | ||
185 | acpi_os_release_mutex(mutex_obj->mutex.os_mutex); | |
186 | return (AE_OK); | |
187 | } |