1 /******************************************************************************
3 * Module Name: nsxfname - Public interfaces to the ACPI subsystem
4 * ACPI Namespace oriented interfaces
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2013, Intel Corp.
10 * All rights reserved.
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13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
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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.
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.
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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45 #include <linux/export.h>
46 #include <acpi/acpi.h>
52 #define _COMPONENT ACPI_NAMESPACE
53 ACPI_MODULE_NAME("nsxfname")
55 /* Local prototypes */
56 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
57 struct acpi_pnp_device_id *source,
60 /******************************************************************************
62 * FUNCTION: acpi_get_handle
64 * PARAMETERS: parent - Object to search under (search scope).
65 * pathname - Pointer to an asciiz string containing the
67 * ret_handle - Where the return handle is returned
71 * DESCRIPTION: This routine will search for a caller specified name in the
72 * name space. The caller can restrict the search region by
73 * specifying a non NULL parent. The parent value is itself a
76 ******************************************************************************/
79 acpi_get_handle(acpi_handle parent,
80 acpi_string pathname, acpi_handle * ret_handle)
83 struct acpi_namespace_node *node = NULL;
84 struct acpi_namespace_node *prefix_node = NULL;
86 ACPI_FUNCTION_ENTRY();
88 /* Parameter Validation */
90 if (!ret_handle || !pathname) {
91 return (AE_BAD_PARAMETER);
94 /* Convert a parent handle to a prefix node */
97 prefix_node = acpi_ns_validate_handle(parent);
99 return (AE_BAD_PARAMETER);
105 * 1) Fully qualified pathname
106 * 2) Parent + Relative pathname
108 * Error for <null Parent + relative path>
110 if (ACPI_IS_ROOT_PREFIX(pathname[0])) {
112 /* Pathname is fully qualified (starts with '\') */
114 /* Special case for root-only, since we can't search for it */
116 if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {
118 ACPI_CAST_PTR(acpi_handle, acpi_gbl_root_node);
121 } else if (!prefix_node) {
123 /* Relative path with null prefix is disallowed */
125 return (AE_BAD_PARAMETER);
128 /* Find the Node and convert to a handle */
131 acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
132 if (ACPI_SUCCESS(status)) {
133 *ret_handle = ACPI_CAST_PTR(acpi_handle, node);
139 ACPI_EXPORT_SYMBOL(acpi_get_handle)
141 /******************************************************************************
143 * FUNCTION: acpi_get_name
145 * PARAMETERS: handle - Handle to be converted to a pathname
146 * name_type - Full pathname or single segment
147 * buffer - Buffer for returned path
149 * RETURN: Pointer to a string containing the fully qualified Name.
151 * DESCRIPTION: This routine returns the fully qualified name associated with
152 * the Handle parameter. This and the acpi_pathname_to_handle are
153 * complementary functions.
155 ******************************************************************************/
157 acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer)
160 struct acpi_namespace_node *node;
162 /* Parameter validation */
164 if (name_type > ACPI_NAME_TYPE_MAX) {
165 return (AE_BAD_PARAMETER);
168 status = acpi_ut_validate_buffer(buffer);
169 if (ACPI_FAILURE(status)) {
173 if (name_type == ACPI_FULL_PATHNAME) {
175 /* Get the full pathname (From the namespace root) */
177 status = acpi_ns_handle_to_pathname(handle, buffer);
182 * Wants the single segment ACPI name.
183 * Validate handle and convert to a namespace Node
185 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
186 if (ACPI_FAILURE(status)) {
190 node = acpi_ns_validate_handle(handle);
192 status = AE_BAD_PARAMETER;
193 goto unlock_and_exit;
196 /* Validate/Allocate/Clear caller buffer */
198 status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
199 if (ACPI_FAILURE(status)) {
200 goto unlock_and_exit;
203 /* Just copy the ACPI name from the Node and zero terminate it */
205 ACPI_MOVE_NAME(buffer->pointer, acpi_ut_get_node_name(node));
206 ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
211 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
215 ACPI_EXPORT_SYMBOL(acpi_get_name)
217 /******************************************************************************
219 * FUNCTION: acpi_ns_copy_device_id
221 * PARAMETERS: dest - Pointer to the destination PNP_DEVICE_ID
222 * source - Pointer to the source PNP_DEVICE_ID
223 * string_area - Pointer to where to copy the dest string
225 * RETURN: Pointer to the next string area
227 * DESCRIPTION: Copy a single PNP_DEVICE_ID, including the string data.
229 ******************************************************************************/
230 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
231 struct acpi_pnp_device_id *source,
235 /* Create the destination PNP_DEVICE_ID */
237 dest->string = string_area;
238 dest->length = source->length;
240 /* Copy actual string and return a pointer to the next string area */
242 ACPI_MEMCPY(string_area, source->string, source->length);
243 return (string_area + source->length);
246 /******************************************************************************
248 * FUNCTION: acpi_get_object_info
250 * PARAMETERS: handle - Object Handle
251 * return_buffer - Where the info is returned
255 * DESCRIPTION: Returns information about an object as gleaned from the
256 * namespace node and possibly by running several standard
257 * control methods (Such as in the case of a device.)
259 * For Device and Processor objects, run the Device _HID, _UID, _CID, _SUB,
260 * _STA, _ADR, _sx_w, and _sx_d methods.
262 * Note: Allocates the return buffer, must be freed by the caller.
264 ******************************************************************************/
267 acpi_get_object_info(acpi_handle handle,
268 struct acpi_device_info **return_buffer)
270 struct acpi_namespace_node *node;
271 struct acpi_device_info *info;
272 struct acpi_pnp_device_id_list *cid_list = NULL;
273 struct acpi_pnp_device_id *hid = NULL;
274 struct acpi_pnp_device_id *uid = NULL;
275 struct acpi_pnp_device_id *sub = NULL;
276 char *next_id_string;
277 acpi_object_type type;
285 /* Parameter validation */
287 if (!handle || !return_buffer) {
288 return (AE_BAD_PARAMETER);
291 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
292 if (ACPI_FAILURE(status)) {
296 node = acpi_ns_validate_handle(handle);
298 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
299 return (AE_BAD_PARAMETER);
302 /* Get the namespace node data while the namespace is locked */
304 info_size = sizeof(struct acpi_device_info);
306 name = node->name.integer;
308 if (node->type == ACPI_TYPE_METHOD) {
309 param_count = node->object->method.param_count;
312 status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
313 if (ACPI_FAILURE(status)) {
317 if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
319 * Get extra info for ACPI Device/Processor objects only:
320 * Run the Device _HID, _UID, _SUB, and _CID methods.
322 * Note: none of these methods are required, so they may or may
323 * not be present for this device. The Info->Valid bitfield is used
324 * to indicate which methods were found and run successfully.
327 /* Execute the Device._HID method */
329 status = acpi_ut_execute_HID(node, &hid);
330 if (ACPI_SUCCESS(status)) {
331 info_size += hid->length;
332 valid |= ACPI_VALID_HID;
335 /* Execute the Device._UID method */
337 status = acpi_ut_execute_UID(node, &uid);
338 if (ACPI_SUCCESS(status)) {
339 info_size += uid->length;
340 valid |= ACPI_VALID_UID;
343 /* Execute the Device._SUB method */
345 status = acpi_ut_execute_SUB(node, &sub);
346 if (ACPI_SUCCESS(status)) {
347 info_size += sub->length;
348 valid |= ACPI_VALID_SUB;
351 /* Execute the Device._CID method */
353 status = acpi_ut_execute_CID(node, &cid_list);
354 if (ACPI_SUCCESS(status)) {
356 /* Add size of CID strings and CID pointer array */
359 (cid_list->list_size -
360 sizeof(struct acpi_pnp_device_id_list));
361 valid |= ACPI_VALID_CID;
366 * Now that we have the variable-length data, we can allocate the
369 info = ACPI_ALLOCATE_ZEROED(info_size);
371 status = AE_NO_MEMORY;
375 /* Get the fixed-length data */
377 if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
379 * Get extra info for ACPI Device/Processor objects only:
380 * Run the _STA, _ADR and, sx_w, and _sx_d methods.
382 * Note: none of these methods are required, so they may or may
383 * not be present for this device. The Info->Valid bitfield is used
384 * to indicate which methods were found and run successfully.
387 /* Execute the Device._STA method */
389 status = acpi_ut_execute_STA(node, &info->current_status);
390 if (ACPI_SUCCESS(status)) {
391 valid |= ACPI_VALID_STA;
394 /* Execute the Device._ADR method */
396 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
398 if (ACPI_SUCCESS(status)) {
399 valid |= ACPI_VALID_ADR;
402 /* Execute the Device._sx_w methods */
404 status = acpi_ut_execute_power_methods(node,
405 acpi_gbl_lowest_dstate_names,
406 ACPI_NUM_sx_w_METHODS,
407 info->lowest_dstates);
408 if (ACPI_SUCCESS(status)) {
409 valid |= ACPI_VALID_SXWS;
412 /* Execute the Device._sx_d methods */
414 status = acpi_ut_execute_power_methods(node,
415 acpi_gbl_highest_dstate_names,
416 ACPI_NUM_sx_d_METHODS,
417 info->highest_dstates);
418 if (ACPI_SUCCESS(status)) {
419 valid |= ACPI_VALID_SXDS;
424 * Create a pointer to the string area of the return buffer.
425 * Point to the end of the base struct acpi_device_info structure.
427 next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids);
430 /* Point past the CID PNP_DEVICE_ID array */
433 ((acpi_size) cid_list->count *
434 sizeof(struct acpi_pnp_device_id));
438 * Copy the HID, UID, SUB, and CIDs to the return buffer.
439 * The variable-length strings are copied to the reserved area
440 * at the end of the buffer.
442 * For HID and CID, check if the ID is a PCI Root Bridge.
445 next_id_string = acpi_ns_copy_device_id(&info->hardware_id,
446 hid, next_id_string);
448 if (acpi_ut_is_pci_root_bridge(hid->string)) {
449 info->flags |= ACPI_PCI_ROOT_BRIDGE;
454 next_id_string = acpi_ns_copy_device_id(&info->unique_id,
455 uid, next_id_string);
459 next_id_string = acpi_ns_copy_device_id(&info->subsystem_id,
460 sub, next_id_string);
464 info->compatible_id_list.count = cid_list->count;
465 info->compatible_id_list.list_size = cid_list->list_size;
469 for (i = 0; i < cid_list->count; i++) {
471 acpi_ns_copy_device_id(&info->compatible_id_list.
472 ids[i], &cid_list->ids[i],
475 if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) {
476 info->flags |= ACPI_PCI_ROOT_BRIDGE;
481 /* Copy the fixed-length data */
483 info->info_size = info_size;
486 info->param_count = param_count;
489 *return_buffer = info;
508 ACPI_EXPORT_SYMBOL(acpi_get_object_info)
510 /******************************************************************************
512 * FUNCTION: acpi_install_method
514 * PARAMETERS: buffer - An ACPI table containing one control method
518 * DESCRIPTION: Install a control method into the namespace. If the method
519 * name already exists in the namespace, it is overwritten. The
520 * input buffer must contain a valid DSDT or SSDT containing a
521 * single control method.
523 ******************************************************************************/
524 acpi_status acpi_install_method(u8 *buffer)
526 struct acpi_table_header *table =
527 ACPI_CAST_PTR(struct acpi_table_header, buffer);
531 struct acpi_namespace_node *node;
532 union acpi_operand_object *method_obj;
533 struct acpi_parse_state parser_state;
539 /* Parameter validation */
542 return (AE_BAD_PARAMETER);
545 /* Table must be a DSDT or SSDT */
547 if (!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) &&
548 !ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
549 return (AE_BAD_HEADER);
552 /* First AML opcode in the table must be a control method */
554 parser_state.aml = buffer + sizeof(struct acpi_table_header);
555 opcode = acpi_ps_peek_opcode(&parser_state);
556 if (opcode != AML_METHOD_OP) {
557 return (AE_BAD_PARAMETER);
560 /* Extract method information from the raw AML */
562 parser_state.aml += acpi_ps_get_opcode_size(opcode);
563 parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
564 path = acpi_ps_get_next_namestring(&parser_state);
565 method_flags = *parser_state.aml++;
566 aml_start = parser_state.aml;
567 aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);
570 * Allocate resources up-front. We don't want to have to delete a new
571 * node from the namespace if we cannot allocate memory.
573 aml_buffer = ACPI_ALLOCATE(aml_length);
575 return (AE_NO_MEMORY);
578 method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
580 ACPI_FREE(aml_buffer);
581 return (AE_NO_MEMORY);
584 /* Lock namespace for acpi_ns_lookup, we may be creating a new node */
586 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
587 if (ACPI_FAILURE(status)) {
591 /* The lookup either returns an existing node or creates a new one */
594 acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
595 ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
598 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
600 if (ACPI_FAILURE(status)) { /* ns_lookup */
601 if (status != AE_ALREADY_EXISTS) {
605 /* Node existed previously, make sure it is a method node */
607 if (node->type != ACPI_TYPE_METHOD) {
613 /* Copy the method AML to the local buffer */
615 ACPI_MEMCPY(aml_buffer, aml_start, aml_length);
617 /* Initialize the method object with the new method's information */
619 method_obj->method.aml_start = aml_buffer;
620 method_obj->method.aml_length = aml_length;
622 method_obj->method.param_count = (u8)
623 (method_flags & AML_METHOD_ARG_COUNT);
625 if (method_flags & AML_METHOD_SERIALIZED) {
626 method_obj->method.info_flags = ACPI_METHOD_SERIALIZED;
628 method_obj->method.sync_level = (u8)
629 ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
633 * Now that it is complete, we can attach the new method object to
634 * the method Node (detaches/deletes any existing object)
636 status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);
639 * Flag indicates AML buffer is dynamic, must be deleted later.
640 * Must be set only after attach above.
642 node->flags |= ANOBJ_ALLOCATED_BUFFER;
644 /* Remove local reference to the method object */
646 acpi_ut_remove_reference(method_obj);
651 ACPI_FREE(aml_buffer);
652 ACPI_FREE(method_obj);
655 ACPI_EXPORT_SYMBOL(acpi_install_method)