drivers/acpi/acpica/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 - 2008, Intel Corp.
  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 <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_NAMESPACE
  50 ACPI_MODULE_NAME("nsxfname")
  51
  52 /******************************************************************************
  53  *
  54  * FUNCTION:    acpi_get_handle
  55  *
  56  * PARAMETERS:  Parent          - Object to search under (search scope).
  57  *              Pathname        - Pointer to an asciiz string containing the
  58  *                                name
  59  *              ret_handle      - Where the return handle is returned
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: This routine will search for a caller specified name in the
  64  *              name space.  The caller can restrict the search region by
  65  *              specifying a non NULL parent.  The parent value is itself a
  66  *              namespace handle.
  67  *
  68  ******************************************************************************/
  69 acpi_status
  70 acpi_get_handle(acpi_handle parent,
  71                 acpi_string pathname, acpi_handle * ret_handle)
  72 {
  73         acpi_status status;
  74         struct acpi_namespace_node *node = NULL;
  75         struct acpi_namespace_node *prefix_node = NULL;
  76
  77         ACPI_FUNCTION_ENTRY();
  78
  79         /* Parameter Validation */
  80
  81         if (!ret_handle || !pathname) {
  82                 return (AE_BAD_PARAMETER);
  83         }
  84
  85         /* Convert a parent handle to a prefix node */
  86
  87         if (parent) {
  88                 prefix_node = acpi_ns_map_handle_to_node(parent);
  89                 if (!prefix_node) {
  90                         return (AE_BAD_PARAMETER);
  91                 }
  92         }
  93
  94         /*
  95          * Valid cases are:
  96          * 1) Fully qualified pathname
  97          * 2) Parent + Relative pathname
  98          *
  99          * Error for <null Parent + relative path>
 100          */
 101         if (acpi_ns_valid_root_prefix(pathname[0])) {
 102
 103                 /* Pathname is fully qualified (starts with '\') */
 104
 105                 /* Special case for root-only, since we can't search for it */
 106
 107                 if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {
 108                         *ret_handle =
 109                             acpi_ns_convert_entry_to_handle(acpi_gbl_root_node);
 110                         return (AE_OK);
 111                 }
 112         } else if (!prefix_node) {
 113
 114                 /* Relative path with null prefix is disallowed */
 115
 116                 return (AE_BAD_PARAMETER);
 117         }
 118
 119         /* Find the Node and convert to a handle */
 120
 121         status =
 122             acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
 123         if (ACPI_SUCCESS(status)) {
 124                 *ret_handle = acpi_ns_convert_entry_to_handle(node);
 125         }
 126
 127         return (status);
 128 }
 129
 130 ACPI_EXPORT_SYMBOL(acpi_get_handle)
 131
 132 /******************************************************************************
 133  *
 134  * FUNCTION:    acpi_get_name
 135  *
 136  * PARAMETERS:  Handle          - Handle to be converted to a pathname
 137  *              name_type       - Full pathname or single segment
 138  *              Buffer          - Buffer for returned path
 139  *
 140  * RETURN:      Pointer to a string containing the fully qualified Name.
 141  *
 142  * DESCRIPTION: This routine returns the fully qualified name associated with
 143  *              the Handle parameter.  This and the acpi_pathname_to_handle are
 144  *              complementary functions.
 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
 166                 /* Get the full pathname (From the namespace root) */
 167
 168                 status = acpi_ns_handle_to_pathname(handle, buffer);
 169                 return (status);
 170         }
 171
 172         /*
 173          * Wants the single segment ACPI name.
 174          * Validate handle and convert to a namespace Node
 175          */
 176         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 177         if (ACPI_FAILURE(status)) {
 178                 return (status);
 179         }
 180
 181         node = acpi_ns_map_handle_to_node(handle);
 182         if (!node) {
 183                 status = AE_BAD_PARAMETER;
 184                 goto unlock_and_exit;
 185         }
 186
 187         /* Validate/Allocate/Clear caller buffer */
 188
 189         status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
 190         if (ACPI_FAILURE(status)) {
 191                 goto unlock_and_exit;
 192         }
 193
 194         /* Just copy the ACPI name from the Node and zero terminate it */
 195
 196         ACPI_STRNCPY(buffer->pointer, acpi_ut_get_node_name(node),
 197                      ACPI_NAME_SIZE);
 198         ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
 199         status = AE_OK;
 200
 201       unlock_and_exit:
 202
 203         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 204         return (status);
 205 }
 206
 207 ACPI_EXPORT_SYMBOL(acpi_get_name)
 208
 209 /******************************************************************************
 210  *
 211  * FUNCTION:    acpi_get_object_info
 212  *
 213  * PARAMETERS:  Handle          - Object Handle
 214  *              Buffer          - Where the info is returned
 215  *
 216  * RETURN:      Status
 217  *
 218  * DESCRIPTION: Returns information about an object as gleaned from the
 219  *              namespace node and possibly by running several standard
 220  *              control methods (Such as in the case of a device.)
 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_ALLOCATE_ZEROED(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                 status = AE_BAD_PARAMETER;
 258                 goto cleanup;
 259         }
 260
 261         /* Init return structure */
 262
 263         size = sizeof(struct acpi_device_info);
 264
 265         info->type = node->type;
 266         info->name = node->name.integer;
 267         info->valid = 0;
 268
 269         if (node->type == ACPI_TYPE_METHOD) {
 270                 info->param_count = node->object->method.param_count;
 271         }
 272
 273         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 274         if (ACPI_FAILURE(status)) {
 275                 goto cleanup;
 276         }
 277
 278         /* If not a device, we are all done */
 279
 280         if (info->type == ACPI_TYPE_DEVICE) {
 281                 /*
 282                  * Get extra info for ACPI Devices objects only:
 283                  * Run the Device _HID, _UID, _CID, _STA, _ADR and _sx_d methods.
 284                  *
 285                  * Note: none of these methods are required, so they may or may
 286                  * not be present for this device.  The Info->Valid bitfield is used
 287                  * to indicate which methods were found and ran successfully.
 288                  */
 289
 290                 /* Execute the Device._HID method */
 291
 292                 status = acpi_ut_execute_HID(node, &info->hardware_id);
 293                 if (ACPI_SUCCESS(status)) {
 294                         info->valid |= ACPI_VALID_HID;
 295                 }
 296
 297                 /* Execute the Device._UID method */
 298
 299                 status = acpi_ut_execute_UID(node, &info->unique_id);
 300                 if (ACPI_SUCCESS(status)) {
 301                         info->valid |= ACPI_VALID_UID;
 302                 }
 303
 304                 /* Execute the Device._CID method */
 305
 306                 status = acpi_ut_execute_CID(node, &cid_list);
 307                 if (ACPI_SUCCESS(status)) {
 308                         size += cid_list->size;
 309                         info->valid |= ACPI_VALID_CID;
 310                 }
 311
 312                 /* Execute the Device._STA method */
 313
 314                 status = acpi_ut_execute_STA(node, &info->current_status);
 315                 if (ACPI_SUCCESS(status)) {
 316                         info->valid |= ACPI_VALID_STA;
 317                 }
 318
 319                 /* Execute the Device._ADR method */
 320
 321                 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
 322                                                          &info->address);
 323                 if (ACPI_SUCCESS(status)) {
 324                         info->valid |= ACPI_VALID_ADR;
 325                 }
 326
 327                 /* Execute the Device._sx_d methods */
 328
 329                 status = acpi_ut_execute_sxds(node, info->highest_dstates);
 330                 if (ACPI_SUCCESS(status)) {
 331                         info->valid |= ACPI_VALID_SXDS;
 332                 }
 333         }
 334
 335         /* Validate/Allocate/Clear caller buffer */
 336
 337         status = acpi_ut_initialize_buffer(buffer, size);
 338         if (ACPI_FAILURE(status)) {
 339                 goto cleanup;
 340         }
 341
 342         /* Populate the return buffer */
 343
 344         return_info = buffer->pointer;
 345         ACPI_MEMCPY(return_info, info, sizeof(struct acpi_device_info));
 346
 347         if (cid_list) {
 348                 ACPI_MEMCPY(&return_info->compatibility_id, cid_list,
 349                             cid_list->size);
 350         }
 351
 352       cleanup:
 353         ACPI_FREE(info);
 354         if (cid_list) {
 355                 ACPI_FREE(cid_list);
 356         }
 357         return (status);
 358 }
 359
 360 ACPI_EXPORT_SYMBOL(acpi_get_object_info)