Lin Ming | ffef682 | 2011-11-16 11:08:30 +0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * |
| 3 | * Module Name: utxfmutex - external AML mutex access functions |
| 4 | * |
| 5 | ******************************************************************************/ |
| 6 | |
| 7 | /* |
Bob Moore | 7784813 | 2012-01-12 13:27:23 +0800 | [diff] [blame] | 8 | * Copyright (C) 2000 - 2012, Intel Corp. |
Lin Ming | ffef682 | 2011-11-16 11:08:30 +0800 | [diff] [blame] | 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 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 61 | * PARAMETERS: handle - Mutex or prefix handle (optional) |
| 62 | * pathname - Mutex pathname (optional) |
Lin Ming | ffef682 | 2011-11-16 11:08:30 +0800 | [diff] [blame] | 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 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 121 | * PARAMETERS: handle - Mutex or prefix handle (optional) |
| 122 | * pathname - Mutex pathname (optional) |
| 123 | * timeout - Max time to wait for the lock (millisec) |
Lin Ming | ffef682 | 2011-11-16 11:08:30 +0800 | [diff] [blame] | 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 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 158 | * PARAMETERS: handle - Mutex or prefix handle (optional) |
| 159 | * pathname - Mutex pathname (optional) |
Lin Ming | ffef682 | 2011-11-16 11:08:30 +0800 | [diff] [blame] | 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 | } |