drivers/acpi/namespace/nsxfname.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsxfname - Public interfaces to the ACPI subsystem
   4  *                         ACPI Namespace oriented interfaces
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2006, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <linux/module.h>
  46
  47 #include <acpi/acpi.h>
  48 #include <acpi/acnamesp.h>
  49
  50 #define _COMPONENT          ACPI_NAMESPACE
  51 ACPI_MODULE_NAME("nsxfname")
  52
  53 /******************************************************************************
  54  *
  55  * FUNCTION:    acpi_get_handle
  56  *
  57  * PARAMETERS:  Parent          - Object to search under (search scope).
  58  *              Pathname        - Pointer to an asciiz string containing the
  59  *                                name
  60  *              ret_handle      - Where the return handle is returned
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: This routine will search for a caller specified name in the
  65  *              name space.  The caller can restrict the search region by
  66  *              specifying a non NULL parent.  The parent value is itself a
  67  *              namespace handle.
  68  *
  69  ******************************************************************************/
  70 acpi_status
  71 acpi_get_handle(acpi_handle parent,
  72                 acpi_string pathname, acpi_handle * ret_handle)
  73 {
  74         acpi_status status;
  75         struct acpi_namespace_node *node = NULL;
  76         struct acpi_namespace_node *prefix_node = NULL;
  77
  78         ACPI_FUNCTION_ENTRY();
  79
  80         /* Parameter Validation */
  81
  82         if (!ret_handle || !pathname) {
  83                 return (AE_BAD_PARAMETER);
  84         }
  85
  86         /* Convert a parent handle to a prefix node */
  87
  88         if (parent) {
  89                 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  90                 if (ACPI_FAILURE(status)) {
  91                         return (status);
  92                 }
  93
  94                 prefix_node = acpi_ns_map_handle_to_node(parent);
  95                 if (!prefix_node) {
  96                         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
  97                         return (AE_BAD_PARAMETER);
  98                 }
  99
 100                 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 101                 if (ACPI_FAILURE(status)) {
 102                         return (status);
 103                 }
 104         }
 105
 106         /* Special case for root, since we can't search for it */
 107
 108         if (ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH) == 0) {
 109                 *ret_handle =
 110                     acpi_ns_convert_entry_to_handle(acpi_gbl_root_node);
 111                 return (AE_OK);
 112         }
 113
 114         /*
 115          *  Find the Node and convert to a handle
 116          */
 117         status =
 118             acpi_ns_get_node_by_path(pathname, prefix_node, ACPI_NS_NO_UPSEARCH,
 119                                      &node);
 120
 121         *ret_handle = NULL;
 122         if (ACPI_SUCCESS(status)) {
 123                 *ret_handle = acpi_ns_convert_entry_to_handle(node);
 124         }
 125
 126         return (status);
 127 }
 128
 129 EXPORT_SYMBOL(acpi_get_handle);
 130
 131 /******************************************************************************
 132  *
 133  * FUNCTION:    acpi_get_name
 134  *
 135  * PARAMETERS:  Handle          - Handle to be converted to a pathname
 136  *              name_type       - Full pathname or single segment
 137  *              Buffer          - Buffer for returned path
 138  *
 139  * RETURN:      Pointer to a string containing the fully qualified Name.
 140  *
 141  * DESCRIPTION: This routine returns the fully qualified name associated with
 142  *              the Handle parameter.  This and the acpi_pathname_to_handle are
 143  *              complementary functions.
 144  *
 145  ******************************************************************************/
 146
 147 acpi_status
 148 acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer)
 149 {
 150         acpi_status status;
 151         struct acpi_namespace_node *node;
 152
 153         /* Parameter validation */
 154
 155         if (name_type > ACPI_NAME_TYPE_MAX) {
 156                 return (AE_BAD_PARAMETER);
 157         }
 158
 159         status = acpi_ut_validate_buffer(buffer);
 160         if (ACPI_FAILURE(status)) {
 161                 return (status);
 162         }
 163
 164         if (name_type == ACPI_FULL_PATHNAME) {
 165                 /* Get the full pathname (From the namespace root) */
 166
 167                 status = acpi_ns_handle_to_pathname(handle, buffer);
 168                 return (status);
 169         }
 170
 171         /*
 172          * Wants the single segment ACPI name.
 173          * Validate handle and convert to a namespace Node
 174          */
 175         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 176         if (ACPI_FAILURE(status)) {
 177                 return (status);
 178         }
 179
 180         node = acpi_ns_map_handle_to_node(handle);
 181         if (!node) {
 182                 status = AE_BAD_PARAMETER;
 183                 goto unlock_and_exit;
 184         }
 185
 186         /* Validate/Allocate/Clear caller buffer */
 187
 188         status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
 189         if (ACPI_FAILURE(status)) {
 190                 goto unlock_and_exit;
 191         }
 192
 193         /* Just copy the ACPI name from the Node and zero terminate it */
 194
 195         ACPI_STRNCPY(buffer->pointer, acpi_ut_get_node_name(node),
 196                      ACPI_NAME_SIZE);
 197         ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
 198         status = AE_OK;
 199
 200       unlock_and_exit:
 201
 202         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 203         return (status);
 204 }
 205
 206 EXPORT_SYMBOL(acpi_get_name);
 207
 208 /******************************************************************************
 209  *
 210  * FUNCTION:    acpi_get_object_info
 211  *
 212  * PARAMETERS:  Handle          - Object Handle
 213  *              Buffer          - Where the info is returned
 214  *
 215  * RETURN:      Status
 216  *
 217  * DESCRIPTION: Returns information about an object as gleaned from the
 218  *              namespace node and possibly by running several standard
 219  *              control methods (Such as in the case of a device.)
 220  *
 221  ******************************************************************************/
 222
 223 acpi_status
 224 acpi_get_object_info(acpi_handle handle, struct acpi_buffer * buffer)
 225 {
 226         acpi_status status;
 227         struct acpi_namespace_node *node;
 228         struct acpi_device_info *info;
 229         struct acpi_device_info *return_info;
 230         struct acpi_compatible_id_list *cid_list = NULL;
 231         acpi_size size;
 232
 233         /* Parameter validation */
 234
 235         if (!handle || !buffer) {
 236                 return (AE_BAD_PARAMETER);
 237         }
 238
 239         status = acpi_ut_validate_buffer(buffer);
 240         if (ACPI_FAILURE(status)) {
 241                 return (status);
 242         }
 243
 244         info = ACPI_MEM_CALLOCATE(sizeof(struct acpi_device_info));
 245         if (!info) {
 246                 return (AE_NO_MEMORY);
 247         }
 248
 249         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 250         if (ACPI_FAILURE(status)) {
 251                 goto cleanup;
 252         }
 253
 254         node = acpi_ns_map_handle_to_node(handle);
 255         if (!node) {
 256                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 257                 goto cleanup;
 258         }
 259
 260         /* Init return structure */
 261
 262         size = sizeof(struct acpi_device_info);
 263
 264         info->type = node->type;
 265         info->name = node->name.integer;
 266         info->valid = 0;
 267
 268         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 269         if (ACPI_FAILURE(status)) {
 270                 goto cleanup;
 271         }
 272
 273         /* If not a device, we are all done */
 274
 275         if (info->type == ACPI_TYPE_DEVICE) {
 276                 /*
 277                  * Get extra info for ACPI Devices objects only:
 278                  * Run the Device _HID, _UID, _CID, _STA, _ADR and _sx_d methods.
 279                  *
 280                  * Note: none of these methods are required, so they may or may
 281                  * not be present for this device.  The Info->Valid bitfield is used
 282                  * to indicate which methods were found and ran successfully.
 283                  */
 284
 285                 /* Execute the Device._HID method */
 286
 287                 status = acpi_ut_execute_HID(node, &info->hardware_id);
 288                 if (ACPI_SUCCESS(status)) {
 289                         info->valid |= ACPI_VALID_HID;
 290                 }
 291
 292                 /* Execute the Device._UID method */
 293
 294                 status = acpi_ut_execute_UID(node, &info->unique_id);
 295                 if (ACPI_SUCCESS(status)) {
 296                         info->valid |= ACPI_VALID_UID;
 297                 }
 298
 299                 /* Execute the Device._CID method */
 300
 301                 status = acpi_ut_execute_CID(node, &cid_list);
 302                 if (ACPI_SUCCESS(status)) {
 303                         size += ((acpi_size) cid_list->count - 1) *
 304                             sizeof(struct acpi_compatible_id);
 305                         info->valid |= ACPI_VALID_CID;
 306                 }
 307
 308                 /* Execute the Device._STA method */
 309
 310                 status = acpi_ut_execute_STA(node, &info->current_status);
 311                 if (ACPI_SUCCESS(status)) {
 312                         info->valid |= ACPI_VALID_STA;
 313                 }
 314
 315                 /* Execute the Device._ADR method */
 316
 317                 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
 318                                                          &info->address);
 319                 if (ACPI_SUCCESS(status)) {
 320                         info->valid |= ACPI_VALID_ADR;
 321                 }
 322
 323                 /* Execute the Device._sx_d methods */
 324
 325                 status = acpi_ut_execute_sxds(node, info->highest_dstates);
 326                 if (ACPI_SUCCESS(status)) {
 327                         info->valid |= ACPI_VALID_SXDS;
 328                 }
 329         }
 330
 331         /* Validate/Allocate/Clear caller buffer */
 332
 333         status = acpi_ut_initialize_buffer(buffer, size);
 334         if (ACPI_FAILURE(status)) {
 335                 goto cleanup;
 336         }
 337
 338         /* Populate the return buffer */
 339
 340         return_info = buffer->pointer;
 341         ACPI_MEMCPY(return_info, info, sizeof(struct acpi_device_info));
 342
 343         if (cid_list) {
 344                 ACPI_MEMCPY(&return_info->compatibility_id, cid_list,
 345                             cid_list->size);
 346         }
 347
 348       cleanup:
 349         ACPI_MEM_FREE(info);
 350         if (cid_list) {
 351                 ACPI_MEM_FREE(cid_list);
 352         }
 353         return (status);
 354 }
 355
 356 EXPORT_SYMBOL(acpi_get_object_info);