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 - 2005, 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
  51 #define _COMPONENT          ACPI_NAMESPACE
  52          ACPI_MODULE_NAME    ("nsxfname")
  53
  54
  55 /******************************************************************************
  56  *
  57  * FUNCTION:    acpi_get_handle
  58  *
  59  * PARAMETERS:  Parent          - Object to search under (search scope).
  60  *              path_name       - Pointer to an asciiz string containing the
  61  *                                  name
  62  *              ret_handle      - Where the return handle is placed
  63  *
  64  * RETURN:      Status
  65  *
  66  * DESCRIPTION: This routine will search for a caller specified name in the
  67  *              name space.  The caller can restrict the search region by
  68  *              specifying a non NULL parent.  The parent value is itself a
  69  *              namespace handle.
  70  *
  71  ******************************************************************************/
  72
  73 acpi_status
  74 acpi_get_handle (
  75         acpi_handle                     parent,
  76         acpi_string                     pathname,
  77         acpi_handle                     *ret_handle)
  78 {
  79         acpi_status                     status;
  80         struct acpi_namespace_node      *node = NULL;
  81         struct acpi_namespace_node      *prefix_node = NULL;
  82
  83
  84         ACPI_FUNCTION_ENTRY ();
  85
  86
  87         /* Parameter Validation */
  88
  89         if (!ret_handle || !pathname) {
  90                 return (AE_BAD_PARAMETER);
  91         }
  92
  93         /* Convert a parent handle to a prefix node */
  94
  95         if (parent) {
  96                 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
  97                 if (ACPI_FAILURE (status)) {
  98                         return (status);
  99                 }
 100
 101                 prefix_node = acpi_ns_map_handle_to_node (parent);
 102                 if (!prefix_node) {
 103                         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 104                         return (AE_BAD_PARAMETER);
 105                 }
 106
 107                 status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 108                 if (ACPI_FAILURE (status)) {
 109                         return (status);
 110                 }
 111         }
 112
 113         /* Special case for root, since we can't search for it */
 114
 115         if (ACPI_STRCMP (pathname, ACPI_NS_ROOT_PATH) == 0) {
 116                 *ret_handle = acpi_ns_convert_entry_to_handle (acpi_gbl_root_node);
 117                 return (AE_OK);
 118         }
 119
 120         /*
 121          *  Find the Node and convert to a handle
 122          */
 123         status = acpi_ns_get_node_by_path (pathname, prefix_node, ACPI_NS_NO_UPSEARCH,
 124                           &node);
 125
 126         *ret_handle = NULL;
 127         if (ACPI_SUCCESS (status)) {
 128                 *ret_handle = acpi_ns_convert_entry_to_handle (node);
 129         }
 130
 131         return (status);
 132 }
 133 EXPORT_SYMBOL(acpi_get_handle);
 134
 135
 136 /******************************************************************************
 137  *
 138  * FUNCTION:    acpi_get_name
 139  *
 140  * PARAMETERS:  Handle          - Handle to be converted to a pathname
 141  *              name_type       - Full pathname or single segment
 142  *              Buffer          - Buffer for returned path
 143  *
 144  * RETURN:      Pointer to a string containing the fully qualified Name.
 145  *
 146  * DESCRIPTION: This routine returns the fully qualified name associated with
 147  *              the Handle parameter.  This and the acpi_pathname_to_handle are
 148  *              complementary functions.
 149  *
 150  ******************************************************************************/
 151
 152 acpi_status
 153 acpi_get_name (
 154         acpi_handle                     handle,
 155         u32                             name_type,
 156         struct acpi_buffer              *buffer)
 157 {
 158         acpi_status                     status;
 159         struct acpi_namespace_node      *node;
 160
 161
 162         /* Parameter validation */
 163
 164         if (name_type > ACPI_NAME_TYPE_MAX) {
 165                 return (AE_BAD_PARAMETER);
 166         }
 167
 168         status = acpi_ut_validate_buffer (buffer);
 169         if (ACPI_FAILURE (status)) {
 170                 return (status);
 171         }
 172
 173         if (name_type == ACPI_FULL_PATHNAME) {
 174                 /* Get the full pathname (From the namespace root) */
 175
 176                 status = acpi_ns_handle_to_pathname (handle, buffer);
 177                 return (status);
 178         }
 179
 180         /*
 181          * Wants the single segment ACPI name.
 182          * Validate handle and convert to a namespace Node
 183          */
 184         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 185         if (ACPI_FAILURE (status)) {
 186                 return (status);
 187         }
 188
 189         node = acpi_ns_map_handle_to_node (handle);
 190         if (!node) {
 191                 status = AE_BAD_PARAMETER;
 192                 goto unlock_and_exit;
 193         }
 194
 195         /* Validate/Allocate/Clear caller buffer */
 196
 197         status = acpi_ut_initialize_buffer (buffer, ACPI_PATH_SEGMENT_LENGTH);
 198         if (ACPI_FAILURE (status)) {
 199                 goto unlock_and_exit;
 200         }
 201
 202         /* Just copy the ACPI name from the Node and zero terminate it */
 203
 204         ACPI_STRNCPY (buffer->pointer, acpi_ut_get_node_name (node),
 205                          ACPI_NAME_SIZE);
 206         ((char *) buffer->pointer) [ACPI_NAME_SIZE] = 0;
 207         status = AE_OK;
 208
 209
 210 unlock_and_exit:
 211
 212         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 213         return (status);
 214 }
 215 EXPORT_SYMBOL(acpi_get_name);
 216
 217
 218 /******************************************************************************
 219  *
 220  * FUNCTION:    acpi_get_object_info
 221  *
 222  * PARAMETERS:  Handle          - Object Handle
 223  *              Info            - Where the info is returned
 224  *
 225  * RETURN:      Status
 226  *
 227  * DESCRIPTION: Returns information about an object as gleaned from the
 228  *              namespace node and possibly by running several standard
 229  *              control methods (Such as in the case of a device.)
 230  *
 231  ******************************************************************************/
 232
 233 acpi_status
 234 acpi_get_object_info (
 235         acpi_handle                     handle,
 236         struct acpi_buffer              *buffer)
 237 {
 238         acpi_status                     status;
 239         struct acpi_namespace_node      *node;
 240         struct acpi_device_info         *info;
 241         struct acpi_device_info         *return_info;
 242         struct acpi_compatible_id_list *cid_list = NULL;
 243         acpi_size                       size;
 244
 245
 246         /* Parameter validation */
 247
 248         if (!handle || !buffer) {
 249                 return (AE_BAD_PARAMETER);
 250         }
 251
 252         status = acpi_ut_validate_buffer (buffer);
 253         if (ACPI_FAILURE (status)) {
 254                 return (status);
 255         }
 256
 257         info = ACPI_MEM_CALLOCATE (sizeof (struct acpi_device_info));
 258         if (!info) {
 259                 return (AE_NO_MEMORY);
 260         }
 261
 262         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 263         if (ACPI_FAILURE (status)) {
 264                 goto cleanup;
 265         }
 266
 267         node = acpi_ns_map_handle_to_node (handle);
 268         if (!node) {
 269                 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 270                 goto cleanup;
 271         }
 272
 273         /* Init return structure */
 274
 275         size = sizeof (struct acpi_device_info);
 276
 277         info->type  = node->type;
 278         info->name  = node->name.integer;
 279         info->valid = 0;
 280
 281         status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 282         if (ACPI_FAILURE (status)) {
 283                 goto cleanup;
 284         }
 285
 286         /* If not a device, we are all done */
 287
 288         if (info->type == ACPI_TYPE_DEVICE) {
 289                 /*
 290                  * Get extra info for ACPI Devices objects only:
 291                  * Run the Device _HID, _UID, _CID, _STA, _ADR and _sx_d methods.
 292                  *
 293                  * Note: none of these methods are required, so they may or may
 294                  * not be present for this device.  The Info->Valid bitfield is used
 295                  * to indicate which methods were found and ran successfully.
 296                  */
 297
 298                 /* Execute the Device._HID method */
 299
 300                 status = acpi_ut_execute_HID (node, &info->hardware_id);
 301                 if (ACPI_SUCCESS (status)) {
 302                         info->valid |= ACPI_VALID_HID;
 303                 }
 304
 305                 /* Execute the Device._UID method */
 306
 307                 status = acpi_ut_execute_UID (node, &info->unique_id);
 308                 if (ACPI_SUCCESS (status)) {
 309                         info->valid |= ACPI_VALID_UID;
 310                 }
 311
 312                 /* Execute the Device._CID method */
 313
 314                 status = acpi_ut_execute_CID (node, &cid_list);
 315                 if (ACPI_SUCCESS (status)) {
 316                         size += ((acpi_size) cid_list->count - 1) *
 317                                          sizeof (struct acpi_compatible_id);
 318                         info->valid |= ACPI_VALID_CID;
 319                 }
 320
 321                 /* Execute the Device._STA method */
 322
 323                 status = acpi_ut_execute_STA (node, &info->current_status);
 324                 if (ACPI_SUCCESS (status)) {
 325                         info->valid |= ACPI_VALID_STA;
 326                 }
 327
 328                 /* Execute the Device._ADR method */
 329
 330                 status = acpi_ut_evaluate_numeric_object (METHOD_NAME__ADR, node,
 331                                   &info->address);
 332                 if (ACPI_SUCCESS (status)) {
 333                         info->valid |= ACPI_VALID_ADR;
 334                 }
 335
 336                 /* Execute the Device._sx_d methods */
 337
 338                 status = acpi_ut_execute_sxds (node, info->highest_dstates);
 339                 if (ACPI_SUCCESS (status)) {
 340                         info->valid |= ACPI_VALID_SXDS;
 341                 }
 342         }
 343
 344         /* Validate/Allocate/Clear caller buffer */
 345
 346         status = acpi_ut_initialize_buffer (buffer, size);
 347         if (ACPI_FAILURE (status)) {
 348                 goto cleanup;
 349         }
 350
 351         /* Populate the return buffer */
 352
 353         return_info = buffer->pointer;
 354         ACPI_MEMCPY (return_info, info, sizeof (struct acpi_device_info));
 355
 356         if (cid_list) {
 357                 ACPI_MEMCPY (&return_info->compatibility_id, cid_list, cid_list->size);
 358         }
 359
 360
 361 cleanup:
 362         ACPI_MEM_FREE (info);
 363         if (cid_list) {
 364                 ACPI_MEM_FREE (cid_list);
 365         }
 366         return (status);
 367 }
 368 EXPORT_SYMBOL(acpi_get_object_info);
 369