![Pierre-Louis Bossart](/assets/img/avatar_default.png)
When the DSDT tables expose devices with subdevices and a set of hierarchical _DSD properties, the data returned by acpi_get_next_subnode() is incorrect, with the results suggesting a bad pointer assignment. The parser works fine with device_nodes or data_nodes, but not with a combination of the two. The problem is traced to an invalid pointer used when jumping from handling device_nodes to data nodes. The existing code looks for data nodes below the last subdevice found instead of the common root. Fix by forcing the acpi_device pointer to be derived from the same fwnode for the two types of subnodes. This same problem of handling device and data nodes was already fixed in a similar way by 'commitbf4703fdd1
("ACPI / property: fix data node parsing in acpi_get_next_subnode()")' but broken later by 'commit34055190b1
("ACPI / property: Add fwnode_get_next_child_node()")', so this should probably go to linux-stable all the way to 4.12 Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1369 lines
36 KiB
C
1369 lines
36 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(const 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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/*
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* The GUIDs here are made equivalent to each other in order to avoid extra
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* complexity in the properties handling code, with the caveat that the
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* kernel will accept certain combinations of GUID and properties that are
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* not defined without a warning. For instance if any of the properties
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* from different GUID appear in a property list of another, it will be
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* accepted by the kernel. Firmware validation tools should catch these.
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*/
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static const guid_t prp_guids[] = {
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/* ACPI _DSD device properties GUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
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GUID_INIT(0xdaffd814, 0x6eba, 0x4d8c,
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0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01),
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/* Hotplug in D3 GUID: 6211e2c0-58a3-4af3-90e1-927a4e0c55a4 */
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GUID_INIT(0x6211e2c0, 0x58a3, 0x4af3,
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0x90, 0xe1, 0x92, 0x7a, 0x4e, 0x0c, 0x55, 0xa4),
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/* External facing port GUID: efcc06cc-73ac-4bc3-bff0-76143807c389 */
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GUID_INIT(0xefcc06cc, 0x73ac, 0x4bc3,
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0xbf, 0xf0, 0x76, 0x14, 0x38, 0x07, 0xc3, 0x89),
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};
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/* ACPI _DSD data subnodes GUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */
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static const guid_t ads_guid =
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GUID_INIT(0xdbb8e3e6, 0x5886, 0x4ba6,
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0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b);
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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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struct fwnode_handle *parent);
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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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struct fwnode_handle *parent)
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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.ops = &acpi_data_fwnode_ops;
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dn->parent = parent;
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INIT_LIST_HEAD(&dn->data.properties);
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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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&dn->fwnode))
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result = true;
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} else if (acpi_enumerate_nondev_subnodes(NULL, desc, &dn->data,
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&dn->fwnode)) {
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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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struct fwnode_handle *parent)
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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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parent))
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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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struct fwnode_handle *parent)
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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, parent);
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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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struct fwnode_handle *parent)
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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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parent);
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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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parent);
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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,
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list, parent);
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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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struct fwnode_handle *parent)
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{
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int i;
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/* Look for the ACPI data subnodes GUID. */
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for (i = 0; i < desc->package.count; i += 2) {
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const union acpi_object *guid, *links;
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guid = &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 GUID and the second one must be
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* a package.
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*/
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if (guid->type != ACPI_TYPE_BUFFER ||
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guid->buffer.length != 16 ||
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links->type != ACPI_TYPE_PACKAGE)
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break;
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if (!guid_equal((guid_t *)guid->buffer.pointer, &ads_guid))
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continue;
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return acpi_add_nondev_subnodes(scope, links, &data->subnodes,
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parent);
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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_is_property_guid(const guid_t *guid)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(prp_guids); i++) {
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if (guid_equal(guid, &prp_guids[i]))
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return true;
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}
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return false;
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}
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struct acpi_device_properties *
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acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
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const union acpi_object *properties)
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{
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struct acpi_device_properties *props;
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props = kzalloc(sizeof(*props), GFP_KERNEL);
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if (props) {
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INIT_LIST_HEAD(&props->list);
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props->guid = guid;
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props->properties = properties;
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list_add_tail(&props->list, &data->properties);
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}
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return props;
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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 GUID. */
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for (i = 0; i < desc->package.count; i += 2) {
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const union acpi_object *guid, *properties;
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guid = &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 GUID and the second one must be
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* a package.
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*/
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if (guid->type != ACPI_TYPE_BUFFER ||
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guid->buffer.length != 16 ||
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properties->type != ACPI_TYPE_PACKAGE)
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break;
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if (!acpi_is_property_guid((guid_t *)guid->buffer.pointer))
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continue;
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/*
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* We found the matching GUID. 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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continue;
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acpi_data_add_props(data, (const guid_t *)guid->buffer.pointer,
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properties);
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}
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return !list_empty(&data->properties);
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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.properties);
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INIT_LIST_HEAD(&adev->data.subnodes);
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if (!adev->handle)
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return;
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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,
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&adev->data, acpi_fwnode_handle(adev)))
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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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if (!adev->data.pointer)
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acpi_extract_apple_properties(adev);
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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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struct acpi_device_properties *props, *tmp;
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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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list_for_each_entry_safe(props, tmp, &adev->data.properties, list) {
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list_del(&props->list);
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kfree(props);
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}
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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(const 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 struct acpi_device_properties *props;
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if (!data || !name)
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return -EINVAL;
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if (!data->pointer || list_empty(&data->properties))
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return -EINVAL;
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list_for_each_entry(props, &data->properties, list) {
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const union acpi_object *properties;
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unsigned int i;
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properties = props->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];
|
|
|
|
propname = &property->package.elements[0];
|
|
propvalue = &property->package.elements[1];
|
|
|
|
if (!strcmp(name, propname->string.pointer)) {
|
|
if (type != ACPI_TYPE_ANY &&
|
|
propvalue->type != type)
|
|
return -EPROTO;
|
|
if (obj)
|
|
*obj = propvalue;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_get_property - return an ACPI property with given name.
|
|
* @adev: ACPI device to get the property from.
|
|
* @name: Name of the property.
|
|
* @type: Expected property type.
|
|
* @obj: Location to store the property value (if not %NULL).
|
|
*/
|
|
int acpi_dev_get_property(const struct acpi_device *adev, const char *name,
|
|
acpi_object_type type, const union acpi_object **obj)
|
|
{
|
|
return adev ? acpi_data_get_property(&adev->data, name, type, obj) : -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_get_property);
|
|
|
|
static const struct acpi_device_data *
|
|
acpi_device_data_of_node(const struct fwnode_handle *fwnode)
|
|
{
|
|
if (is_acpi_device_node(fwnode)) {
|
|
const struct acpi_device *adev = to_acpi_device_node(fwnode);
|
|
return &adev->data;
|
|
} else if (is_acpi_data_node(fwnode)) {
|
|
const struct acpi_data_node *dn = to_acpi_data_node(fwnode);
|
|
return &dn->data;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* acpi_node_prop_get - return an ACPI property with given name.
|
|
* @fwnode: Firmware node to get the property from.
|
|
* @propname: Name of the property.
|
|
* @valptr: Location to store a pointer to the property value (if not %NULL).
|
|
*/
|
|
int acpi_node_prop_get(const struct fwnode_handle *fwnode,
|
|
const char *propname, void **valptr)
|
|
{
|
|
return acpi_data_get_property(acpi_device_data_of_node(fwnode),
|
|
propname, ACPI_TYPE_ANY,
|
|
(const union acpi_object **)valptr);
|
|
}
|
|
|
|
/**
|
|
* acpi_data_get_property_array - return an ACPI array property with given name
|
|
* @adev: ACPI data object to get the property from
|
|
* @name: Name of the property
|
|
* @type: Expected type of array elements
|
|
* @obj: Location to store a pointer to the property value (if not NULL)
|
|
*
|
|
* Look up an array property with @name and store a pointer to the resulting
|
|
* ACPI object at the location pointed to by @obj if found.
|
|
*
|
|
* Callers must not attempt to free the returned objects. Those objects will be
|
|
* freed by the ACPI core automatically during the removal of @data.
|
|
*
|
|
* Return: %0 if array property (package) with @name has been found (success),
|
|
* %-EINVAL if the arguments are invalid,
|
|
* %-EINVAL if the property doesn't exist,
|
|
* %-EPROTO if the property is not a package or the type of its elements
|
|
* doesn't match @type.
|
|
*/
|
|
static int acpi_data_get_property_array(const struct acpi_device_data *data,
|
|
const char *name,
|
|
acpi_object_type type,
|
|
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;
|
|
}
|
|
|
|
static struct fwnode_handle *
|
|
acpi_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
|
|
const char *childname)
|
|
{
|
|
struct fwnode_handle *child;
|
|
|
|
/*
|
|
* Find first matching named child node of this fwnode.
|
|
* For ACPI this will be a data only sub-node.
|
|
*/
|
|
fwnode_for_each_child_node(fwnode, child)
|
|
if (acpi_data_node_match(child, childname))
|
|
return child;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* __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 or index %3 return %-ENOENT. If the
|
|
* property does not contain any more values %-ENOENT 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(const struct fwnode_handle *fwnode,
|
|
const char *propname, size_t index, size_t num_args,
|
|
struct fwnode_reference_args *args)
|
|
{
|
|
const union acpi_object *element, *end;
|
|
const union acpi_object *obj;
|
|
const struct acpi_device_data *data;
|
|
struct acpi_device *device;
|
|
int ret, idx = 0;
|
|
|
|
data = acpi_device_data_of_node(fwnode);
|
|
if (!data)
|
|
return -ENOENT;
|
|
|
|
ret = acpi_data_get_property(data, propname, ACPI_TYPE_ANY, &obj);
|
|
if (ret)
|
|
return ret == -EINVAL ? -ENOENT : -EINVAL;
|
|
|
|
/*
|
|
* 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 == -ENODEV ? -EINVAL : ret;
|
|
|
|
args->fwnode = acpi_fwnode_handle(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)
|
|
return -EINVAL;
|
|
if (index >= obj->package.count)
|
|
return -ENOENT;
|
|
|
|
element = obj->package.elements;
|
|
end = element + obj->package.count;
|
|
|
|
while (element < end) {
|
|
u32 nargs, i;
|
|
|
|
if (element->type == ACPI_TYPE_LOCAL_REFERENCE) {
|
|
struct fwnode_handle *ref_fwnode;
|
|
|
|
ret = acpi_bus_get_device(element->reference.handle,
|
|
&device);
|
|
if (ret)
|
|
return -EINVAL;
|
|
|
|
nargs = 0;
|
|
element++;
|
|
|
|
/*
|
|
* Find the referred data extension node under the
|
|
* referred device node.
|
|
*/
|
|
for (ref_fwnode = acpi_fwnode_handle(device);
|
|
element < end && element->type == ACPI_TYPE_STRING;
|
|
element++) {
|
|
ref_fwnode = acpi_fwnode_get_named_child_node(
|
|
ref_fwnode, element->string.pointer);
|
|
if (!ref_fwnode)
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* 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 -EINVAL;
|
|
}
|
|
|
|
if (nargs > NR_FWNODE_REFERENCE_ARGS)
|
|
return -EINVAL;
|
|
|
|
if (idx == index) {
|
|
args->fwnode = ref_fwnode;
|
|
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 -EINVAL;
|
|
}
|
|
|
|
idx++;
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__acpi_node_get_property_reference);
|
|
|
|
static int acpi_data_prop_read_single(const 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;
|
|
|
|
return 1;
|
|
} 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)
|
|
{
|
|
int ret;
|
|
|
|
if (!adev)
|
|
return -EINVAL;
|
|
|
|
ret = acpi_data_prop_read_single(&adev->data, propname, proptype, val);
|
|
if (ret < 0 || proptype != ACPI_TYPE_STRING)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
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 nval;
|
|
}
|
|
|
|
static int acpi_data_prop_read(const 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 >= 0)
|
|
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 (proptype != DEV_PROP_STRING && 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,
|
|
min_t(u32, nval, obj->package.count));
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int acpi_dev_prop_read(const 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(const 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 fwnode
|
|
* @fwnode: Firmware node 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(const struct fwnode_handle *fwnode,
|
|
struct fwnode_handle *child)
|
|
{
|
|
const struct acpi_device *adev = to_acpi_device_node(fwnode);
|
|
const struct list_head *head;
|
|
struct list_head *next;
|
|
|
|
if (!child || is_acpi_device_node(child)) {
|
|
struct acpi_device *child_adev;
|
|
|
|
if (adev)
|
|
head = &adev->children;
|
|
else
|
|
goto nondev;
|
|
|
|
if (list_empty(head))
|
|
goto nondev;
|
|
|
|
if (child) {
|
|
adev = to_acpi_device_node(child);
|
|
next = adev->node.next;
|
|
if (next == head) {
|
|
child = NULL;
|
|
goto nondev;
|
|
}
|
|
child_adev = list_entry(next, struct acpi_device, node);
|
|
} else {
|
|
child_adev = list_first_entry(head, struct acpi_device,
|
|
node);
|
|
}
|
|
return acpi_fwnode_handle(child_adev);
|
|
}
|
|
|
|
nondev:
|
|
if (!child || is_acpi_data_node(child)) {
|
|
const struct acpi_data_node *data = to_acpi_data_node(fwnode);
|
|
struct acpi_data_node *dn;
|
|
|
|
/*
|
|
* We can have a combination of device and data nodes, e.g. with
|
|
* hierarchical _DSD properties. Make sure the adev pointer is
|
|
* restored before going through data nodes, otherwise we will
|
|
* be looking for data_nodes below the last device found instead
|
|
* of the common fwnode shared by device_nodes and data_nodes.
|
|
*/
|
|
adev = to_acpi_device_node(fwnode);
|
|
if (adev)
|
|
head = &adev->data.subnodes;
|
|
else if (data)
|
|
head = &data->data.subnodes;
|
|
else
|
|
return NULL;
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* acpi_node_get_parent - Return parent fwnode of this fwnode
|
|
* @fwnode: Firmware node whose parent to get
|
|
*
|
|
* Returns parent node of an ACPI device or data firmware node or %NULL if
|
|
* not available.
|
|
*/
|
|
struct fwnode_handle *acpi_node_get_parent(const struct fwnode_handle *fwnode)
|
|
{
|
|
if (is_acpi_data_node(fwnode)) {
|
|
/* All data nodes have parent pointer so just return that */
|
|
return to_acpi_data_node(fwnode)->parent;
|
|
} else if (is_acpi_device_node(fwnode)) {
|
|
acpi_handle handle, parent_handle;
|
|
|
|
handle = to_acpi_device_node(fwnode)->handle;
|
|
if (ACPI_SUCCESS(acpi_get_parent(handle, &parent_handle))) {
|
|
struct acpi_device *adev;
|
|
|
|
if (!acpi_bus_get_device(parent_handle, &adev))
|
|
return acpi_fwnode_handle(adev);
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Return true if the node is an ACPI graph node. Called on either ports
|
|
* or endpoints.
|
|
*/
|
|
static bool is_acpi_graph_node(struct fwnode_handle *fwnode,
|
|
const char *str)
|
|
{
|
|
unsigned int len = strlen(str);
|
|
const char *name;
|
|
|
|
if (!len || !is_acpi_data_node(fwnode))
|
|
return false;
|
|
|
|
name = to_acpi_data_node(fwnode)->name;
|
|
|
|
return (fwnode_property_present(fwnode, "reg") &&
|
|
!strncmp(name, str, len) && name[len] == '@') ||
|
|
fwnode_property_present(fwnode, str);
|
|
}
|
|
|
|
/**
|
|
* acpi_graph_get_next_endpoint - Get next endpoint ACPI firmware node
|
|
* @fwnode: Pointer to the parent firmware node
|
|
* @prev: Previous endpoint node or %NULL to get the first
|
|
*
|
|
* Looks up next endpoint ACPI firmware node below a given @fwnode. Returns
|
|
* %NULL if there is no next endpoint or in case of error. In case of success
|
|
* the next endpoint is returned.
|
|
*/
|
|
static struct fwnode_handle *acpi_graph_get_next_endpoint(
|
|
const struct fwnode_handle *fwnode, struct fwnode_handle *prev)
|
|
{
|
|
struct fwnode_handle *port = NULL;
|
|
struct fwnode_handle *endpoint;
|
|
|
|
if (!prev) {
|
|
do {
|
|
port = fwnode_get_next_child_node(fwnode, port);
|
|
/*
|
|
* The names of the port nodes begin with "port@"
|
|
* followed by the number of the port node and they also
|
|
* have a "reg" property that also has the number of the
|
|
* port node. For compatibility reasons a node is also
|
|
* recognised as a port node from the "port" property.
|
|
*/
|
|
if (is_acpi_graph_node(port, "port"))
|
|
break;
|
|
} while (port);
|
|
} else {
|
|
port = fwnode_get_parent(prev);
|
|
}
|
|
|
|
if (!port)
|
|
return NULL;
|
|
|
|
endpoint = fwnode_get_next_child_node(port, prev);
|
|
while (!endpoint) {
|
|
port = fwnode_get_next_child_node(fwnode, port);
|
|
if (!port)
|
|
break;
|
|
if (is_acpi_graph_node(port, "port"))
|
|
endpoint = fwnode_get_next_child_node(port, NULL);
|
|
}
|
|
|
|
/*
|
|
* The names of the endpoint nodes begin with "endpoint@" followed by
|
|
* the number of the endpoint node and they also have a "reg" property
|
|
* that also has the number of the endpoint node. For compatibility
|
|
* reasons a node is also recognised as an endpoint node from the
|
|
* "endpoint" property.
|
|
*/
|
|
if (!is_acpi_graph_node(endpoint, "endpoint"))
|
|
return NULL;
|
|
|
|
return endpoint;
|
|
}
|
|
|
|
/**
|
|
* acpi_graph_get_child_prop_value - Return a child with a given property value
|
|
* @fwnode: device fwnode
|
|
* @prop_name: The name of the property to look for
|
|
* @val: the desired property value
|
|
*
|
|
* Return the port node corresponding to a given port number. Returns
|
|
* the child node on success, NULL otherwise.
|
|
*/
|
|
static struct fwnode_handle *acpi_graph_get_child_prop_value(
|
|
const struct fwnode_handle *fwnode, const char *prop_name,
|
|
unsigned int val)
|
|
{
|
|
struct fwnode_handle *child;
|
|
|
|
fwnode_for_each_child_node(fwnode, child) {
|
|
u32 nr;
|
|
|
|
if (fwnode_property_read_u32(child, prop_name, &nr))
|
|
continue;
|
|
|
|
if (val == nr)
|
|
return child;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/**
|
|
* acpi_graph_get_remote_enpoint - Parses and returns remote end of an endpoint
|
|
* @fwnode: Endpoint firmware node pointing to a remote device
|
|
* @endpoint: Firmware node of remote endpoint is filled here if not %NULL
|
|
*
|
|
* Returns the remote endpoint corresponding to @__fwnode. NULL on error.
|
|
*/
|
|
static struct fwnode_handle *
|
|
acpi_graph_get_remote_endpoint(const struct fwnode_handle *__fwnode)
|
|
{
|
|
struct fwnode_handle *fwnode;
|
|
unsigned int port_nr, endpoint_nr;
|
|
struct fwnode_reference_args args;
|
|
int ret;
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
ret = acpi_node_get_property_reference(__fwnode, "remote-endpoint", 0,
|
|
&args);
|
|
if (ret)
|
|
return NULL;
|
|
|
|
/* Direct endpoint reference? */
|
|
if (!is_acpi_device_node(args.fwnode))
|
|
return args.nargs ? NULL : args.fwnode;
|
|
|
|
/*
|
|
* Always require two arguments with the reference: port and
|
|
* endpoint indices.
|
|
*/
|
|
if (args.nargs != 2)
|
|
return NULL;
|
|
|
|
fwnode = args.fwnode;
|
|
port_nr = args.args[0];
|
|
endpoint_nr = args.args[1];
|
|
|
|
fwnode = acpi_graph_get_child_prop_value(fwnode, "port", port_nr);
|
|
|
|
return acpi_graph_get_child_prop_value(fwnode, "endpoint", endpoint_nr);
|
|
}
|
|
|
|
static bool acpi_fwnode_device_is_available(const struct fwnode_handle *fwnode)
|
|
{
|
|
if (!is_acpi_device_node(fwnode))
|
|
return false;
|
|
|
|
return acpi_device_is_present(to_acpi_device_node(fwnode));
|
|
}
|
|
|
|
static bool acpi_fwnode_property_present(const struct fwnode_handle *fwnode,
|
|
const char *propname)
|
|
{
|
|
return !acpi_node_prop_get(fwnode, propname, NULL);
|
|
}
|
|
|
|
static int
|
|
acpi_fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
|
|
const char *propname,
|
|
unsigned int elem_size, void *val,
|
|
size_t nval)
|
|
{
|
|
enum dev_prop_type type;
|
|
|
|
switch (elem_size) {
|
|
case sizeof(u8):
|
|
type = DEV_PROP_U8;
|
|
break;
|
|
case sizeof(u16):
|
|
type = DEV_PROP_U16;
|
|
break;
|
|
case sizeof(u32):
|
|
type = DEV_PROP_U32;
|
|
break;
|
|
case sizeof(u64):
|
|
type = DEV_PROP_U64;
|
|
break;
|
|
default:
|
|
return -ENXIO;
|
|
}
|
|
|
|
return acpi_node_prop_read(fwnode, propname, type, val, nval);
|
|
}
|
|
|
|
static int
|
|
acpi_fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
|
|
const char *propname, const char **val,
|
|
size_t nval)
|
|
{
|
|
return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING,
|
|
val, nval);
|
|
}
|
|
|
|
static int
|
|
acpi_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
|
|
const char *prop, const char *nargs_prop,
|
|
unsigned int args_count, unsigned int index,
|
|
struct fwnode_reference_args *args)
|
|
{
|
|
return __acpi_node_get_property_reference(fwnode, prop, index,
|
|
args_count, args);
|
|
}
|
|
|
|
static struct fwnode_handle *
|
|
acpi_fwnode_get_parent(struct fwnode_handle *fwnode)
|
|
{
|
|
return acpi_node_get_parent(fwnode);
|
|
}
|
|
|
|
static int acpi_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
|
|
struct fwnode_endpoint *endpoint)
|
|
{
|
|
struct fwnode_handle *port_fwnode = fwnode_get_parent(fwnode);
|
|
|
|
endpoint->local_fwnode = fwnode;
|
|
|
|
if (fwnode_property_read_u32(port_fwnode, "reg", &endpoint->port))
|
|
fwnode_property_read_u32(port_fwnode, "port", &endpoint->port);
|
|
if (fwnode_property_read_u32(fwnode, "reg", &endpoint->id))
|
|
fwnode_property_read_u32(fwnode, "endpoint", &endpoint->id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const void *
|
|
acpi_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
|
|
const struct device *dev)
|
|
{
|
|
return acpi_device_get_match_data(dev);
|
|
}
|
|
|
|
#define DECLARE_ACPI_FWNODE_OPS(ops) \
|
|
const struct fwnode_operations ops = { \
|
|
.device_is_available = acpi_fwnode_device_is_available, \
|
|
.device_get_match_data = acpi_fwnode_device_get_match_data, \
|
|
.property_present = acpi_fwnode_property_present, \
|
|
.property_read_int_array = \
|
|
acpi_fwnode_property_read_int_array, \
|
|
.property_read_string_array = \
|
|
acpi_fwnode_property_read_string_array, \
|
|
.get_parent = acpi_node_get_parent, \
|
|
.get_next_child_node = acpi_get_next_subnode, \
|
|
.get_named_child_node = acpi_fwnode_get_named_child_node, \
|
|
.get_reference_args = acpi_fwnode_get_reference_args, \
|
|
.graph_get_next_endpoint = \
|
|
acpi_graph_get_next_endpoint, \
|
|
.graph_get_remote_endpoint = \
|
|
acpi_graph_get_remote_endpoint, \
|
|
.graph_get_port_parent = acpi_fwnode_get_parent, \
|
|
.graph_parse_endpoint = acpi_fwnode_graph_parse_endpoint, \
|
|
}; \
|
|
EXPORT_SYMBOL_GPL(ops)
|
|
|
|
DECLARE_ACPI_FWNODE_OPS(acpi_device_fwnode_ops);
|
|
DECLARE_ACPI_FWNODE_OPS(acpi_data_fwnode_ops);
|
|
const struct fwnode_operations acpi_static_fwnode_ops;
|
|
|
|
bool is_acpi_device_node(const struct fwnode_handle *fwnode)
|
|
{
|
|
return !IS_ERR_OR_NULL(fwnode) &&
|
|
fwnode->ops == &acpi_device_fwnode_ops;
|
|
}
|
|
EXPORT_SYMBOL(is_acpi_device_node);
|
|
|
|
bool is_acpi_data_node(const struct fwnode_handle *fwnode)
|
|
{
|
|
return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &acpi_data_fwnode_ops;
|
|
}
|
|
EXPORT_SYMBOL(is_acpi_data_node);
|