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![Rafael J. Wysocki](/assets/img/avatar_default.png)
The definition document of the Hierarchical Properties Extension UUID for _DSD has been changed recently to allow local references to be used as sub-node link targets (previously, it only allowed strings to be used for that purpose). Update the code in drivers/acpi/property.c to reflect that change. Link: http://www.uefi.org/sites/default/files/resources/_DSD-hierarchical-data-extension-UUID-v1.1.pdf Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
922 lines
23 KiB
C
922 lines
23 KiB
C
/*
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* ACPI device specific properties support.
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*
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* Copyright (C) 2014, Intel Corporation
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* All rights reserved.
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*
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* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
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* Darren Hart <dvhart@linux.intel.com>
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* Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/export.h>
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#include "internal.h"
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static int acpi_data_get_property_array(struct acpi_device_data *data,
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const char *name,
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acpi_object_type type,
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const union acpi_object **obj);
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/* ACPI _DSD device properties UUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
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static const u8 prp_uuid[16] = {
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0x14, 0xd8, 0xff, 0xda, 0xba, 0x6e, 0x8c, 0x4d,
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0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01
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};
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/* ACPI _DSD data subnodes UUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */
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static const u8 ads_uuid[16] = {
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0xe6, 0xe3, 0xb8, 0xdb, 0x86, 0x58, 0xa6, 0x4b,
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0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b
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};
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static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
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const union acpi_object *desc,
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struct acpi_device_data *data);
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static bool acpi_extract_properties(const union acpi_object *desc,
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struct acpi_device_data *data);
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static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
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acpi_handle handle,
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const union acpi_object *link,
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struct list_head *list)
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{
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struct acpi_data_node *dn;
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bool result;
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dn = kzalloc(sizeof(*dn), GFP_KERNEL);
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if (!dn)
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return false;
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dn->name = link->package.elements[0].string.pointer;
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dn->fwnode.type = FWNODE_ACPI_DATA;
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INIT_LIST_HEAD(&dn->data.subnodes);
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result = acpi_extract_properties(desc, &dn->data);
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if (handle) {
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acpi_handle scope;
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acpi_status status;
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/*
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* The scope for the subnode object lookup is the one of the
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* namespace node (device) containing the object that has
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* returned the package. That is, it's the scope of that
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* object's parent.
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*/
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status = acpi_get_parent(handle, &scope);
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if (ACPI_SUCCESS(status)
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&& acpi_enumerate_nondev_subnodes(scope, desc, &dn->data))
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result = true;
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} else if (acpi_enumerate_nondev_subnodes(NULL, desc, &dn->data)) {
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result = true;
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}
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if (result) {
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dn->handle = handle;
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dn->data.pointer = desc;
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list_add_tail(&dn->sibling, list);
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return true;
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}
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kfree(dn);
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acpi_handle_debug(handle, "Invalid properties/subnodes data, skipping\n");
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return false;
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}
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static bool acpi_nondev_subnode_data_ok(acpi_handle handle,
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const union acpi_object *link,
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struct list_head *list)
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{
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struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
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acpi_status status;
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status = acpi_evaluate_object_typed(handle, NULL, NULL, &buf,
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ACPI_TYPE_PACKAGE);
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if (ACPI_FAILURE(status))
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return false;
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if (acpi_nondev_subnode_extract(buf.pointer, handle, link, list))
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return true;
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ACPI_FREE(buf.pointer);
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return false;
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}
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static bool acpi_nondev_subnode_ok(acpi_handle scope,
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const union acpi_object *link,
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struct list_head *list)
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{
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acpi_handle handle;
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acpi_status status;
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if (!scope)
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return false;
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status = acpi_get_handle(scope, link->package.elements[1].string.pointer,
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&handle);
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if (ACPI_FAILURE(status))
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return false;
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return acpi_nondev_subnode_data_ok(handle, link, list);
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}
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static int acpi_add_nondev_subnodes(acpi_handle scope,
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const union acpi_object *links,
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struct list_head *list)
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{
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bool ret = false;
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int i;
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for (i = 0; i < links->package.count; i++) {
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const union acpi_object *link, *desc;
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acpi_handle handle;
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bool result;
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link = &links->package.elements[i];
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/* Only two elements allowed. */
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if (link->package.count != 2)
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continue;
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/* The first one must be a string. */
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if (link->package.elements[0].type != ACPI_TYPE_STRING)
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continue;
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/* The second one may be a string, a reference or a package. */
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switch (link->package.elements[1].type) {
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case ACPI_TYPE_STRING:
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result = acpi_nondev_subnode_ok(scope, link, list);
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break;
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case ACPI_TYPE_LOCAL_REFERENCE:
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handle = link->package.elements[1].reference.handle;
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result = acpi_nondev_subnode_data_ok(handle, link, list);
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break;
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case ACPI_TYPE_PACKAGE:
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desc = &link->package.elements[1];
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result = acpi_nondev_subnode_extract(desc, NULL, link, list);
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break;
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default:
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result = false;
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break;
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}
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ret = ret || result;
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}
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return ret;
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}
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static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
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const union acpi_object *desc,
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struct acpi_device_data *data)
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{
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int i;
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/* Look for the ACPI data subnodes UUID. */
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for (i = 0; i < desc->package.count; i += 2) {
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const union acpi_object *uuid, *links;
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uuid = &desc->package.elements[i];
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links = &desc->package.elements[i + 1];
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/*
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* The first element must be a UUID and the second one must be
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* a package.
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*/
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if (uuid->type != ACPI_TYPE_BUFFER || uuid->buffer.length != 16
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|| links->type != ACPI_TYPE_PACKAGE)
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break;
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if (memcmp(uuid->buffer.pointer, ads_uuid, sizeof(ads_uuid)))
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continue;
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return acpi_add_nondev_subnodes(scope, links, &data->subnodes);
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}
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return false;
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}
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static bool acpi_property_value_ok(const union acpi_object *value)
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{
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int j;
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/*
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* The value must be an integer, a string, a reference, or a package
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* whose every element must be an integer, a string, or a reference.
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*/
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switch (value->type) {
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case ACPI_TYPE_INTEGER:
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case ACPI_TYPE_STRING:
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case ACPI_TYPE_LOCAL_REFERENCE:
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return true;
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case ACPI_TYPE_PACKAGE:
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for (j = 0; j < value->package.count; j++)
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switch (value->package.elements[j].type) {
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case ACPI_TYPE_INTEGER:
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case ACPI_TYPE_STRING:
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case ACPI_TYPE_LOCAL_REFERENCE:
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continue;
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default:
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return false;
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}
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return true;
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}
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return false;
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}
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static bool acpi_properties_format_valid(const union acpi_object *properties)
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{
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int i;
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for (i = 0; i < properties->package.count; i++) {
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const union acpi_object *property;
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property = &properties->package.elements[i];
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/*
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* Only two elements allowed, the first one must be a string and
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* the second one has to satisfy certain conditions.
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*/
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if (property->package.count != 2
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|| property->package.elements[0].type != ACPI_TYPE_STRING
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|| !acpi_property_value_ok(&property->package.elements[1]))
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return false;
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}
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return true;
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}
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static void acpi_init_of_compatible(struct acpi_device *adev)
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{
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const union acpi_object *of_compatible;
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int ret;
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ret = acpi_data_get_property_array(&adev->data, "compatible",
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ACPI_TYPE_STRING, &of_compatible);
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if (ret) {
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ret = acpi_dev_get_property(adev, "compatible",
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ACPI_TYPE_STRING, &of_compatible);
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if (ret) {
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if (adev->parent
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&& adev->parent->flags.of_compatible_ok)
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goto out;
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return;
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}
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}
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adev->data.of_compatible = of_compatible;
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out:
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adev->flags.of_compatible_ok = 1;
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}
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static bool acpi_extract_properties(const union acpi_object *desc,
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struct acpi_device_data *data)
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{
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int i;
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if (desc->package.count % 2)
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return false;
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/* Look for the device properties UUID. */
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for (i = 0; i < desc->package.count; i += 2) {
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const union acpi_object *uuid, *properties;
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uuid = &desc->package.elements[i];
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properties = &desc->package.elements[i + 1];
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/*
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* The first element must be a UUID and the second one must be
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* a package.
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*/
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if (uuid->type != ACPI_TYPE_BUFFER || uuid->buffer.length != 16
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|| properties->type != ACPI_TYPE_PACKAGE)
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break;
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if (memcmp(uuid->buffer.pointer, prp_uuid, sizeof(prp_uuid)))
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continue;
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/*
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* We found the matching UUID. Now validate the format of the
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* package immediately following it.
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*/
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if (!acpi_properties_format_valid(properties))
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break;
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data->properties = properties;
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return true;
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}
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return false;
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}
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void acpi_init_properties(struct acpi_device *adev)
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{
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struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
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struct acpi_hardware_id *hwid;
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acpi_status status;
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bool acpi_of = false;
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INIT_LIST_HEAD(&adev->data.subnodes);
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/*
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* Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in
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* Device Tree compatible properties for this device.
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*/
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list_for_each_entry(hwid, &adev->pnp.ids, list) {
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if (!strcmp(hwid->id, ACPI_DT_NAMESPACE_HID)) {
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acpi_of = true;
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break;
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}
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}
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status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, &buf,
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ACPI_TYPE_PACKAGE);
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if (ACPI_FAILURE(status))
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goto out;
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if (acpi_extract_properties(buf.pointer, &adev->data)) {
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adev->data.pointer = buf.pointer;
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if (acpi_of)
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acpi_init_of_compatible(adev);
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}
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if (acpi_enumerate_nondev_subnodes(adev->handle, buf.pointer, &adev->data))
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adev->data.pointer = buf.pointer;
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if (!adev->data.pointer) {
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acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n");
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ACPI_FREE(buf.pointer);
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}
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out:
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if (acpi_of && !adev->flags.of_compatible_ok)
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acpi_handle_info(adev->handle,
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ACPI_DT_NAMESPACE_HID " requires 'compatible' property\n");
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}
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static void acpi_destroy_nondev_subnodes(struct list_head *list)
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{
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struct acpi_data_node *dn, *next;
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if (list_empty(list))
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return;
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list_for_each_entry_safe_reverse(dn, next, list, sibling) {
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acpi_destroy_nondev_subnodes(&dn->data.subnodes);
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wait_for_completion(&dn->kobj_done);
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list_del(&dn->sibling);
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ACPI_FREE((void *)dn->data.pointer);
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kfree(dn);
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}
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}
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void acpi_free_properties(struct acpi_device *adev)
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{
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acpi_destroy_nondev_subnodes(&adev->data.subnodes);
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ACPI_FREE((void *)adev->data.pointer);
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adev->data.of_compatible = NULL;
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adev->data.pointer = NULL;
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adev->data.properties = NULL;
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}
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/**
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* acpi_data_get_property - return an ACPI property with given name
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* @data: ACPI device deta object to get the property from
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* @name: Name of the property
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* @type: Expected property type
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* @obj: Location to store the property value (if not %NULL)
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*
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* Look up a property with @name and store a pointer to the resulting ACPI
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* object at the location pointed to by @obj if found.
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*
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* Callers must not attempt to free the returned objects. These objects will be
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* freed by the ACPI core automatically during the removal of @data.
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*
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* Return: %0 if property with @name has been found (success),
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* %-EINVAL if the arguments are invalid,
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* %-EINVAL if the property doesn't exist,
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* %-EPROTO if the property value type doesn't match @type.
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*/
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static int acpi_data_get_property(struct acpi_device_data *data,
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const char *name, acpi_object_type type,
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const union acpi_object **obj)
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{
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const union acpi_object *properties;
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int i;
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if (!data || !name)
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return -EINVAL;
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if (!data->pointer || !data->properties)
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return -EINVAL;
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properties = data->properties;
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for (i = 0; i < properties->package.count; i++) {
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const union acpi_object *propname, *propvalue;
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const union acpi_object *property;
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property = &properties->package.elements[i];
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propname = &property->package.elements[0];
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propvalue = &property->package.elements[1];
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if (!strcmp(name, propname->string.pointer)) {
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if (type != ACPI_TYPE_ANY && propvalue->type != type)
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return -EPROTO;
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if (obj)
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*obj = propvalue;
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return 0;
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}
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}
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return -EINVAL;
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}
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|
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/**
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* acpi_dev_get_property - return an ACPI property with given name.
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* @adev: ACPI device to get the property from.
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* @name: Name of the property.
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* @type: Expected property type.
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* @obj: Location to store the property value (if not %NULL).
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*/
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int acpi_dev_get_property(struct acpi_device *adev, const char *name,
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acpi_object_type type, const union acpi_object **obj)
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{
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return adev ? acpi_data_get_property(&adev->data, name, type, obj) : -EINVAL;
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}
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EXPORT_SYMBOL_GPL(acpi_dev_get_property);
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static struct acpi_device_data *acpi_device_data_of_node(struct fwnode_handle *fwnode)
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{
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if (fwnode->type == FWNODE_ACPI) {
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struct acpi_device *adev = to_acpi_device_node(fwnode);
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return &adev->data;
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} else if (fwnode->type == FWNODE_ACPI_DATA) {
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struct acpi_data_node *dn = to_acpi_data_node(fwnode);
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return &dn->data;
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}
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return NULL;
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}
|
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|
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/**
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* acpi_node_prop_get - return an ACPI property with given name.
|
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* @fwnode: Firmware node to get the property from.
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* @propname: Name of the property.
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* @valptr: Location to store a pointer to the property value (if not %NULL).
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*/
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int acpi_node_prop_get(struct fwnode_handle *fwnode, const char *propname,
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void **valptr)
|
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{
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return acpi_data_get_property(acpi_device_data_of_node(fwnode),
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propname, ACPI_TYPE_ANY,
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(const union acpi_object **)valptr);
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}
|
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|
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/**
|
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* acpi_data_get_property_array - return an ACPI array property with given name
|
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* @adev: ACPI data object to get the property from
|
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* @name: Name of the property
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* @type: Expected type of array elements
|
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* @obj: Location to store a pointer to the property value (if not NULL)
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*
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* Look up an array property with @name and store a pointer to the resulting
|
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* ACPI object at the location pointed to by @obj if found.
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*
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* Callers must not attempt to free the returned objects. Those objects will be
|
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* freed by the ACPI core automatically during the removal of @data.
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*
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* Return: %0 if array property (package) with @name has been found (success),
|
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* %-EINVAL if the arguments are invalid,
|
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* %-EINVAL if the property doesn't exist,
|
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* %-EPROTO if the property is not a package or the type of its elements
|
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* doesn't match @type.
|
|
*/
|
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static int acpi_data_get_property_array(struct acpi_device_data *data,
|
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const char *name,
|
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acpi_object_type type,
|
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const union acpi_object **obj)
|
|
{
|
|
const union acpi_object *prop;
|
|
int ret, i;
|
|
|
|
ret = acpi_data_get_property(data, name, ACPI_TYPE_PACKAGE, &prop);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (type != ACPI_TYPE_ANY) {
|
|
/* Check that all elements are of correct type. */
|
|
for (i = 0; i < prop->package.count; i++)
|
|
if (prop->package.elements[i].type != type)
|
|
return -EPROTO;
|
|
}
|
|
if (obj)
|
|
*obj = prop;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __acpi_node_get_property_reference - returns handle to the referenced object
|
|
* @fwnode: Firmware node to get the property from
|
|
* @propname: Name of the property
|
|
* @index: Index of the reference to return
|
|
* @num_args: Maximum number of arguments after each reference
|
|
* @args: Location to store the returned reference with optional arguments
|
|
*
|
|
* Find property with @name, verifify that it is a package containing at least
|
|
* one object reference and if so, store the ACPI device object pointer to the
|
|
* target object in @args->adev. If the reference includes arguments, store
|
|
* them in the @args->args[] array.
|
|
*
|
|
* If there's more than one reference in the property value package, @index is
|
|
* used to select the one to return.
|
|
*
|
|
* It is possible to leave holes in the property value set like in the
|
|
* example below:
|
|
*
|
|
* Package () {
|
|
* "cs-gpios",
|
|
* Package () {
|
|
* ^GPIO, 19, 0, 0,
|
|
* ^GPIO, 20, 0, 0,
|
|
* 0,
|
|
* ^GPIO, 21, 0, 0,
|
|
* }
|
|
* }
|
|
*
|
|
* Calling this function with index %2 return %-ENOENT and with index %3
|
|
* returns the last entry. If the property does not contain any more values
|
|
* %-ENODATA is returned. The NULL entry must be single integer and
|
|
* preferably contain value %0.
|
|
*
|
|
* Return: %0 on success, negative error code on failure.
|
|
*/
|
|
int __acpi_node_get_property_reference(struct fwnode_handle *fwnode,
|
|
const char *propname, size_t index, size_t num_args,
|
|
struct acpi_reference_args *args)
|
|
{
|
|
const union acpi_object *element, *end;
|
|
const union acpi_object *obj;
|
|
struct acpi_device_data *data;
|
|
struct acpi_device *device;
|
|
int ret, idx = 0;
|
|
|
|
data = acpi_device_data_of_node(fwnode);
|
|
if (!data)
|
|
return -EINVAL;
|
|
|
|
ret = acpi_data_get_property(data, propname, ACPI_TYPE_ANY, &obj);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* The simplest case is when the value is a single reference. Just
|
|
* return that reference then.
|
|
*/
|
|
if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) {
|
|
if (index)
|
|
return -EINVAL;
|
|
|
|
ret = acpi_bus_get_device(obj->reference.handle, &device);
|
|
if (ret)
|
|
return ret;
|
|
|
|
args->adev = device;
|
|
args->nargs = 0;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If it is not a single reference, then it is a package of
|
|
* references followed by number of ints as follows:
|
|
*
|
|
* Package () { REF, INT, REF, INT, INT }
|
|
*
|
|
* The index argument is then used to determine which reference
|
|
* the caller wants (along with the arguments).
|
|
*/
|
|
if (obj->type != ACPI_TYPE_PACKAGE || index >= obj->package.count)
|
|
return -EPROTO;
|
|
|
|
element = obj->package.elements;
|
|
end = element + obj->package.count;
|
|
|
|
while (element < end) {
|
|
u32 nargs, i;
|
|
|
|
if (element->type == ACPI_TYPE_LOCAL_REFERENCE) {
|
|
ret = acpi_bus_get_device(element->reference.handle,
|
|
&device);
|
|
if (ret)
|
|
return -ENODEV;
|
|
|
|
nargs = 0;
|
|
element++;
|
|
|
|
/* assume following integer elements are all args */
|
|
for (i = 0; element + i < end && i < num_args; i++) {
|
|
int type = element[i].type;
|
|
|
|
if (type == ACPI_TYPE_INTEGER)
|
|
nargs++;
|
|
else if (type == ACPI_TYPE_LOCAL_REFERENCE)
|
|
break;
|
|
else
|
|
return -EPROTO;
|
|
}
|
|
|
|
if (nargs > MAX_ACPI_REFERENCE_ARGS)
|
|
return -EPROTO;
|
|
|
|
if (idx == index) {
|
|
args->adev = device;
|
|
args->nargs = nargs;
|
|
for (i = 0; i < nargs; i++)
|
|
args->args[i] = element[i].integer.value;
|
|
|
|
return 0;
|
|
}
|
|
|
|
element += nargs;
|
|
} else if (element->type == ACPI_TYPE_INTEGER) {
|
|
if (idx == index)
|
|
return -ENOENT;
|
|
element++;
|
|
} else {
|
|
return -EPROTO;
|
|
}
|
|
|
|
idx++;
|
|
}
|
|
|
|
return -ENODATA;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__acpi_node_get_property_reference);
|
|
|
|
static int acpi_data_prop_read_single(struct acpi_device_data *data,
|
|
const char *propname,
|
|
enum dev_prop_type proptype, void *val)
|
|
{
|
|
const union acpi_object *obj;
|
|
int ret;
|
|
|
|
if (!val)
|
|
return -EINVAL;
|
|
|
|
if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) {
|
|
ret = acpi_data_get_property(data, propname, ACPI_TYPE_INTEGER, &obj);
|
|
if (ret)
|
|
return ret;
|
|
|
|
switch (proptype) {
|
|
case DEV_PROP_U8:
|
|
if (obj->integer.value > U8_MAX)
|
|
return -EOVERFLOW;
|
|
*(u8 *)val = obj->integer.value;
|
|
break;
|
|
case DEV_PROP_U16:
|
|
if (obj->integer.value > U16_MAX)
|
|
return -EOVERFLOW;
|
|
*(u16 *)val = obj->integer.value;
|
|
break;
|
|
case DEV_PROP_U32:
|
|
if (obj->integer.value > U32_MAX)
|
|
return -EOVERFLOW;
|
|
*(u32 *)val = obj->integer.value;
|
|
break;
|
|
default:
|
|
*(u64 *)val = obj->integer.value;
|
|
break;
|
|
}
|
|
} else if (proptype == DEV_PROP_STRING) {
|
|
ret = acpi_data_get_property(data, propname, ACPI_TYPE_STRING, &obj);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*(char **)val = obj->string.pointer;
|
|
} else {
|
|
ret = -EINVAL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname,
|
|
enum dev_prop_type proptype, void *val)
|
|
{
|
|
return adev ? acpi_data_prop_read_single(&adev->data, propname, proptype, val) : -EINVAL;
|
|
}
|
|
|
|
static int acpi_copy_property_array_u8(const union acpi_object *items, u8 *val,
|
|
size_t nval)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nval; i++) {
|
|
if (items[i].type != ACPI_TYPE_INTEGER)
|
|
return -EPROTO;
|
|
if (items[i].integer.value > U8_MAX)
|
|
return -EOVERFLOW;
|
|
|
|
val[i] = items[i].integer.value;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_copy_property_array_u16(const union acpi_object *items,
|
|
u16 *val, size_t nval)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nval; i++) {
|
|
if (items[i].type != ACPI_TYPE_INTEGER)
|
|
return -EPROTO;
|
|
if (items[i].integer.value > U16_MAX)
|
|
return -EOVERFLOW;
|
|
|
|
val[i] = items[i].integer.value;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_copy_property_array_u32(const union acpi_object *items,
|
|
u32 *val, size_t nval)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nval; i++) {
|
|
if (items[i].type != ACPI_TYPE_INTEGER)
|
|
return -EPROTO;
|
|
if (items[i].integer.value > U32_MAX)
|
|
return -EOVERFLOW;
|
|
|
|
val[i] = items[i].integer.value;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_copy_property_array_u64(const union acpi_object *items,
|
|
u64 *val, size_t nval)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nval; i++) {
|
|
if (items[i].type != ACPI_TYPE_INTEGER)
|
|
return -EPROTO;
|
|
|
|
val[i] = items[i].integer.value;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_copy_property_array_string(const union acpi_object *items,
|
|
char **val, size_t nval)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nval; i++) {
|
|
if (items[i].type != ACPI_TYPE_STRING)
|
|
return -EPROTO;
|
|
|
|
val[i] = items[i].string.pointer;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_data_prop_read(struct acpi_device_data *data,
|
|
const char *propname,
|
|
enum dev_prop_type proptype,
|
|
void *val, size_t nval)
|
|
{
|
|
const union acpi_object *obj;
|
|
const union acpi_object *items;
|
|
int ret;
|
|
|
|
if (val && nval == 1) {
|
|
ret = acpi_data_prop_read_single(data, propname, proptype, val);
|
|
if (!ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = acpi_data_get_property_array(data, propname, ACPI_TYPE_ANY, &obj);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!val)
|
|
return obj->package.count;
|
|
|
|
if (nval > obj->package.count)
|
|
return -EOVERFLOW;
|
|
else if (nval <= 0)
|
|
return -EINVAL;
|
|
|
|
items = obj->package.elements;
|
|
|
|
switch (proptype) {
|
|
case DEV_PROP_U8:
|
|
ret = acpi_copy_property_array_u8(items, (u8 *)val, nval);
|
|
break;
|
|
case DEV_PROP_U16:
|
|
ret = acpi_copy_property_array_u16(items, (u16 *)val, nval);
|
|
break;
|
|
case DEV_PROP_U32:
|
|
ret = acpi_copy_property_array_u32(items, (u32 *)val, nval);
|
|
break;
|
|
case DEV_PROP_U64:
|
|
ret = acpi_copy_property_array_u64(items, (u64 *)val, nval);
|
|
break;
|
|
case DEV_PROP_STRING:
|
|
ret = acpi_copy_property_array_string(items, (char **)val, nval);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int acpi_dev_prop_read(struct acpi_device *adev, const char *propname,
|
|
enum dev_prop_type proptype, void *val, size_t nval)
|
|
{
|
|
return adev ? acpi_data_prop_read(&adev->data, propname, proptype, val, nval) : -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* acpi_node_prop_read - retrieve the value of an ACPI property with given name.
|
|
* @fwnode: Firmware node to get the property from.
|
|
* @propname: Name of the property.
|
|
* @proptype: Expected property type.
|
|
* @val: Location to store the property value (if not %NULL).
|
|
* @nval: Size of the array pointed to by @val.
|
|
*
|
|
* If @val is %NULL, return the number of array elements comprising the value
|
|
* of the property. Otherwise, read at most @nval values to the array at the
|
|
* location pointed to by @val.
|
|
*/
|
|
int acpi_node_prop_read(struct fwnode_handle *fwnode, const char *propname,
|
|
enum dev_prop_type proptype, void *val, size_t nval)
|
|
{
|
|
return acpi_data_prop_read(acpi_device_data_of_node(fwnode),
|
|
propname, proptype, val, nval);
|
|
}
|
|
|
|
/**
|
|
* acpi_get_next_subnode - Return the next child node handle for a device.
|
|
* @dev: Device to find the next child node for.
|
|
* @child: Handle to one of the device's child nodes or a null handle.
|
|
*/
|
|
struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
|
|
struct fwnode_handle *child)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
struct list_head *head, *next;
|
|
|
|
if (!adev)
|
|
return NULL;
|
|
|
|
if (!child || child->type == FWNODE_ACPI) {
|
|
head = &adev->children;
|
|
if (list_empty(head))
|
|
goto nondev;
|
|
|
|
if (child) {
|
|
adev = to_acpi_device_node(child);
|
|
next = adev->node.next;
|
|
if (next == head) {
|
|
child = NULL;
|
|
adev = ACPI_COMPANION(dev);
|
|
goto nondev;
|
|
}
|
|
adev = list_entry(next, struct acpi_device, node);
|
|
} else {
|
|
adev = list_first_entry(head, struct acpi_device, node);
|
|
}
|
|
return acpi_fwnode_handle(adev);
|
|
}
|
|
|
|
nondev:
|
|
if (!child || child->type == FWNODE_ACPI_DATA) {
|
|
struct acpi_data_node *dn;
|
|
|
|
head = &adev->data.subnodes;
|
|
if (list_empty(head))
|
|
return NULL;
|
|
|
|
if (child) {
|
|
dn = to_acpi_data_node(child);
|
|
next = dn->sibling.next;
|
|
if (next == head)
|
|
return NULL;
|
|
|
|
dn = list_entry(next, struct acpi_data_node, sibling);
|
|
} else {
|
|
dn = list_first_entry(head, struct acpi_data_node, sibling);
|
|
}
|
|
return &dn->fwnode;
|
|
}
|
|
return NULL;
|
|
}
|