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 - 2004, 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
  46 #include <acpi/acpi.h>
  47 #include <acpi/acnamesp.h>
  48
  49
  50 #define _COMPONENT          ACPI_NAMESPACE
  51          ACPI_MODULE_NAME    ("nsxfname")
  52
  53
  54 /******************************************************************************
  55  *
  56  * FUNCTION:    acpi_get_handle
  57  *
  58  * PARAMETERS:  Parent          - Object to search under (search scope).
  59  *              path_name       - Pointer to an asciiz string containing the
  60  *                                  name
  61  *              ret_handle      - Where the return handle is placed
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: This routine will search for a caller specified name in the
  66  *              name space.  The caller can restrict the search region by
  67  *              specifying a non NULL parent.  The parent value is itself a
  68  *              namespace handle.
  69  *
  70  ******************************************************************************/
  71
  72 acpi_status
  73 acpi_get_handle (
  74         acpi_handle                     parent,
  75         acpi_string                     pathname,
  76         acpi_handle                     *ret_handle)
  77 {
  78         acpi_status                     status;
  79         struct acpi_namespace_node      *node = NULL;
  80         struct acpi_namespace_node      *prefix_node = NULL;
  81
  82
  83         ACPI_FUNCTION_ENTRY ();
  84
  85
  86         /* Parameter Validation */
  87
  88         if (!ret_handle || !pathname) {
  89                 return (AE_BAD_PARAMETER);
  90         }
  91
  92         /* Convert a parent handle to a prefix node */
  93
  94         if (parent) {
  95                 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
  96                 if (ACPI_FAILURE (status)) {
  97                         return (status);
  98                 }
  99
 100                 prefix_node = acpi_ns_map_handle_to_node (parent);
 101                 if (!prefix_node) {
 102                         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 103                         return (AE_BAD_PARAMETER);
 104                 }
 105
 106                 status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 107                 if (ACPI_FAILURE (status)) {
 108                         return (status);
 109                 }
 110         }
 111
 112         /* Special case for root, since we can't search for it */
 113
 114         if (ACPI_STRCMP (pathname, ACPI_NS_ROOT_PATH) == 0) {
 115                 *ret_handle = acpi_ns_convert_entry_to_handle (acpi_gbl_root_node);
 116                 return (AE_OK);
 117         }
 118
 119         /*
 120          *  Find the Node and convert to a handle
 121          */
 122         status = acpi_ns_get_node_by_path (pathname, prefix_node, ACPI_NS_NO_UPSEARCH,
 123                           &node);
 124
 125         *ret_handle = NULL;
 126         if (ACPI_SUCCESS (status)) {
 127                 *ret_handle = acpi_ns_convert_entry_to_handle (node);
 128         }
 129
 130         return (status);
 131 }
 132
 133
 134 /******************************************************************************
 135  *
 136  * FUNCTION:    acpi_get_name
 137  *
 138  * PARAMETERS:  Handle          - Handle to be converted to a pathname
 139  *              name_type       - Full pathname or single segment
 140  *              Buffer          - Buffer for returned path
 141  *
 142  * RETURN:      Pointer to a string containing the fully qualified Name.
 143  *
 144  * DESCRIPTION: This routine returns the fully qualified name associated with
 145  *              the Handle parameter.  This and the acpi_pathname_to_handle are
 146  *              complementary functions.
 147  *
 148  ******************************************************************************/
 149
 150 acpi_status
 151 acpi_get_name (
 152         acpi_handle                     handle,
 153         u32                             name_type,
 154         struct acpi_buffer              *buffer)
 155 {
 156         acpi_status                     status;
 157         struct acpi_namespace_node      *node;
 158
 159
 160         /* Parameter validation */
 161
 162         if (name_type > ACPI_NAME_TYPE_MAX) {
 163                 return (AE_BAD_PARAMETER);
 164         }
 165
 166         status = acpi_ut_validate_buffer (buffer);
 167         if (ACPI_FAILURE (status)) {
 168                 return (status);
 169         }
 170
 171         if (name_type == ACPI_FULL_PATHNAME) {
 172                 /* Get the full pathname (From the namespace root) */
 173
 174                 status = acpi_ns_handle_to_pathname (handle, buffer);
 175                 return (status);
 176         }
 177
 178         /*
 179          * Wants the single segment ACPI name.
 180          * Validate handle and convert to a namespace Node
 181          */
 182         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 183         if (ACPI_FAILURE (status)) {
 184                 return (status);
 185         }
 186
 187         node = acpi_ns_map_handle_to_node (handle);
 188         if (!node) {
 189                 status = AE_BAD_PARAMETER;
 190                 goto unlock_and_exit;
 191         }
 192
 193         /* Validate/Allocate/Clear caller buffer */
 194
 195         status = acpi_ut_initialize_buffer (buffer, ACPI_PATH_SEGMENT_LENGTH);
 196         if (ACPI_FAILURE (status)) {
 197                 goto unlock_and_exit;
 198         }
 199
 200         /* Just copy the ACPI name from the Node and zero terminate it */
 201
 202         ACPI_STRNCPY (buffer->pointer, acpi_ut_get_node_name (node),
 203                          ACPI_NAME_SIZE);
 204         ((char *) buffer->pointer) [ACPI_NAME_SIZE] = 0;
 205         status = AE_OK;
 206
 207
 208 unlock_and_exit:
 209
 210         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 211         return (status);
 212 }
 213
 214
 215 /******************************************************************************
 216  *
 217  * FUNCTION:    acpi_get_object_info
 218  *
 219  * PARAMETERS:  Handle          - Object Handle
 220  *              Info            - Where the info is returned
 221  *
 222  * RETURN:      Status
 223  *
 224  * DESCRIPTION: Returns information about an object as gleaned from the
 225  *              namespace node and possibly by running several standard
 226  *              control methods (Such as in the case of a device.)
 227  *
 228  ******************************************************************************/
 229
 230 acpi_status
 231 acpi_get_object_info (
 232         acpi_handle                     handle,
 233         struct acpi_buffer              *buffer)
 234 {
 235         acpi_status                     status;
 236         struct acpi_namespace_node      *node;
 237         struct acpi_device_info         info;
 238         struct acpi_device_info         *return_info;
 239         struct acpi_compatible_id_list *cid_list = NULL;
 240         acpi_size                       size;
 241
 242
 243         /* Parameter validation */
 244
 245         if (!handle || !buffer) {
 246                 return (AE_BAD_PARAMETER);
 247         }
 248
 249         status = acpi_ut_validate_buffer (buffer);
 250         if (ACPI_FAILURE (status)) {
 251                 return (status);
 252         }
 253
 254         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 255         if (ACPI_FAILURE (status)) {
 256                 return (status);
 257         }
 258
 259         node = acpi_ns_map_handle_to_node (handle);
 260         if (!node) {
 261                 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 262                 return (AE_BAD_PARAMETER);
 263         }
 264
 265         /* Init return structure */
 266
 267         size = sizeof (struct acpi_device_info);
 268         ACPI_MEMSET (&info, 0, size);
 269
 270         info.type  = node->type;
 271         info.name  = node->name.integer;
 272         info.valid = 0;
 273
 274         status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 275         if (ACPI_FAILURE (status)) {
 276                 return (status);
 277         }
 278
 279         /* If not a device, we are all done */
 280
 281         if (info.type == ACPI_TYPE_DEVICE) {
 282                 /*
 283                  * Get extra info for ACPI Devices objects only:
 284                  * Run the Device _HID, _UID, _CID, _STA, _ADR and _sx_d methods.
 285                  *
 286                  * Note: none of these methods are required, so they may or may
 287                  * not be present for this device.  The Info.Valid bitfield is used
 288                  * to indicate which methods were found and ran successfully.
 289                  */
 290
 291                 /* Execute the Device._HID method */
 292
 293                 status = acpi_ut_execute_HID (node, &info.hardware_id);
 294                 if (ACPI_SUCCESS (status)) {
 295                         info.valid |= ACPI_VALID_HID;
 296                 }
 297
 298                 /* Execute the Device._UID method */
 299
 300                 status = acpi_ut_execute_UID (node, &info.unique_id);
 301                 if (ACPI_SUCCESS (status)) {
 302                         info.valid |= ACPI_VALID_UID;
 303                 }
 304
 305                 /* Execute the Device._CID method */
 306
 307                 status = acpi_ut_execute_CID (node, &cid_list);
 308                 if (ACPI_SUCCESS (status)) {
 309                         size += ((acpi_size) cid_list->count - 1) *
 310                                          sizeof (struct acpi_compatible_id);
 311                         info.valid |= ACPI_VALID_CID;
 312                 }
 313
 314                 /* Execute the Device._STA method */
 315
 316                 status = acpi_ut_execute_STA (node, &info.current_status);
 317                 if (ACPI_SUCCESS (status)) {
 318                         info.valid |= ACPI_VALID_STA;
 319                 }
 320
 321                 /* Execute the Device._ADR method */
 322
 323                 status = acpi_ut_evaluate_numeric_object (METHOD_NAME__ADR, node,
 324                                   &info.address);
 325                 if (ACPI_SUCCESS (status)) {
 326                         info.valid |= ACPI_VALID_ADR;
 327                 }
 328
 329                 /* Execute the Device._sx_d methods */
 330
 331                 status = acpi_ut_execute_sxds (node, info.highest_dstates);
 332                 if (ACPI_SUCCESS (status)) {
 333                         info.valid |= ACPI_VALID_SXDS;
 334                 }
 335
 336                 status = AE_OK;
 337         }
 338
 339         /* Validate/Allocate/Clear caller buffer */
 340
 341         status = acpi_ut_initialize_buffer (buffer, size);
 342         if (ACPI_FAILURE (status)) {
 343                 goto cleanup;
 344         }
 345
 346         /* Populate the return buffer */
 347
 348         return_info = buffer->pointer;
 349         ACPI_MEMCPY (return_info, &info, sizeof (struct acpi_device_info));
 350
 351         if (cid_list) {
 352                 ACPI_MEMCPY (&return_info->compatibility_id, cid_list, cid_list->size);
 353         }
 354
 355
 356 cleanup:
 357         if (cid_list) {
 358                 ACPI_MEM_FREE (cid_list);
 359         }
 360         return (status);
 361 }
 362