Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /******************************************************************************* * * Module Name: utxfmutex - external AML mutex access functions * ******************************************************************************/ #include <acpi/acpi.h> #include "accommon.h" #include "acnamesp.h" #define _COMPONENT ACPI_UTILITIES ACPI_MODULE_NAME("utxfmutex") /* Local prototypes */ static acpi_status acpi_ut_get_mutex_object(acpi_handle handle, acpi_string pathname, union acpi_operand_object **ret_obj); /******************************************************************************* * * FUNCTION: acpi_ut_get_mutex_object * * PARAMETERS: handle - Mutex or prefix handle (optional) * pathname - Mutex pathname (optional) * ret_obj - Where the mutex object is returned * * RETURN: Status * * DESCRIPTION: Get an AML mutex object. The mutex node is pointed to by * Handle:Pathname. Either Handle or Pathname can be NULL, but * not both. * ******************************************************************************/ static acpi_status acpi_ut_get_mutex_object(acpi_handle handle, acpi_string pathname, union acpi_operand_object **ret_obj) { struct acpi_namespace_node *mutex_node; union acpi_operand_object *mutex_obj; acpi_status status; /* Parameter validation */ if (!ret_obj || (!handle && !pathname)) { return (AE_BAD_PARAMETER); } /* Get a the namespace node for the mutex */ mutex_node = handle; if (pathname != NULL) { status = acpi_get_handle(handle, pathname, ACPI_CAST_PTR(acpi_handle, &mutex_node)); if (ACPI_FAILURE(status)) { return (status); } } /* Ensure that we actually have a Mutex object */ if (!mutex_node || (mutex_node->type != ACPI_TYPE_MUTEX)) { return (AE_TYPE); } /* Get the low-level mutex object */ mutex_obj = acpi_ns_get_attached_object(mutex_node); if (!mutex_obj) { return (AE_NULL_OBJECT); } *ret_obj = mutex_obj; return (AE_OK); } /******************************************************************************* * * FUNCTION: acpi_acquire_mutex * * PARAMETERS: handle - Mutex or prefix handle (optional) * pathname - Mutex pathname (optional) * timeout - Max time to wait for the lock (millisec) * * RETURN: Status * * DESCRIPTION: Acquire an AML mutex. This is a device driver interface to * AML mutex objects, and allows for transaction locking between * drivers and AML code. The mutex node is pointed to by * Handle:Pathname. Either Handle or Pathname can be NULL, but * not both. * ******************************************************************************/ acpi_status acpi_acquire_mutex(acpi_handle handle, acpi_string pathname, u16 timeout) { acpi_status status; union acpi_operand_object *mutex_obj; /* Get the low-level mutex associated with Handle:Pathname */ status = acpi_ut_get_mutex_object(handle, pathname, &mutex_obj); if (ACPI_FAILURE(status)) { return (status); } /* Acquire the OS mutex */ status = acpi_os_acquire_mutex(mutex_obj->mutex.os_mutex, timeout); return (status); } ACPI_EXPORT_SYMBOL(acpi_acquire_mutex) /******************************************************************************* * * FUNCTION: acpi_release_mutex * * PARAMETERS: handle - Mutex or prefix handle (optional) * pathname - Mutex pathname (optional) * * RETURN: Status * * DESCRIPTION: Release an AML mutex. This is a device driver interface to * AML mutex objects, and allows for transaction locking between * drivers and AML code. The mutex node is pointed to by * Handle:Pathname. Either Handle or Pathname can be NULL, but * not both. * ******************************************************************************/ acpi_status acpi_release_mutex(acpi_handle handle, acpi_string pathname) { acpi_status status; union acpi_operand_object *mutex_obj; /* Get the low-level mutex associated with Handle:Pathname */ status = acpi_ut_get_mutex_object(handle, pathname, &mutex_obj); if (ACPI_FAILURE(status)) { return (status); } /* Release the OS mutex */ acpi_os_release_mutex(mutex_obj->mutex.os_mutex); return (AE_OK); } ACPI_EXPORT_SYMBOL(acpi_release_mutex) |