![Rafael J. Wysocki](/assets/img/avatar_default.png)
Use a #defined symbol ACPI_DT_NAMESPACE_HID instead of the PRP0001 string. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
560 lines
14 KiB
C
560 lines
14 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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/* 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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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_dev_get_property_array(adev, "compatible", ACPI_TYPE_STRING,
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&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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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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bool acpi_of = false;
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struct acpi_hardware_id *hwid;
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const union acpi_object *desc;
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acpi_status status;
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int i;
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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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desc = buf.pointer;
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if (desc->package.count % 2)
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goto fail;
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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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adev->data.pointer = buf.pointer;
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adev->data.properties = properties;
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if (acpi_of)
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acpi_init_of_compatible(adev);
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goto out;
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}
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fail:
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dev_dbg(&adev->dev, "Returned _DSD data is not valid, skipping\n");
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ACPI_FREE(buf.pointer);
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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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void acpi_free_properties(struct acpi_device *adev)
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{
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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_dev_get_property - return an ACPI property with given name
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* @adev: ACPI device to get property
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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 @adev.
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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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* %-ENODATA 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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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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const union acpi_object *properties;
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int i;
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if (!adev || !name)
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return -EINVAL;
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if (!adev->data.pointer || !adev->data.properties)
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return -ENODATA;
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properties = adev->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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else 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 -ENODATA;
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}
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EXPORT_SYMBOL_GPL(acpi_dev_get_property);
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/**
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* acpi_dev_get_property_array - return an ACPI array property with given name
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* @adev: ACPI device to get property
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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 @adev.
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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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* %-ENODATA 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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*/
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int acpi_dev_get_property_array(struct acpi_device *adev, 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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const union acpi_object *prop;
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int ret, i;
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ret = acpi_dev_get_property(adev, name, ACPI_TYPE_PACKAGE, &prop);
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if (ret)
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return ret;
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if (type != ACPI_TYPE_ANY) {
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/* Check that all elements are of correct type. */
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for (i = 0; i < prop->package.count; i++)
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if (prop->package.elements[i].type != type)
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return -EPROTO;
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}
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if (obj)
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*obj = prop;
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_dev_get_property_array);
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/**
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* acpi_dev_get_property_reference - returns handle to the referenced object
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* @adev: ACPI device to get property
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* @name: Name of the property
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* @index: Index of the reference to return
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* @args: Location to store the returned reference with optional arguments
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*
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* Find property with @name, verifify that it is a package containing at least
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* one object reference and if so, store the ACPI device object pointer to the
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* target object in @args->adev. If the reference includes arguments, store
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* them in the @args->args[] array.
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*
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* If there's more than one reference in the property value package, @index is
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* used to select the one to return.
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*
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* Return: %0 on success, negative error code on failure.
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*/
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int acpi_dev_get_property_reference(struct acpi_device *adev,
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const char *name, size_t index,
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struct acpi_reference_args *args)
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{
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const union acpi_object *element, *end;
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const union acpi_object *obj;
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struct acpi_device *device;
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int ret, idx = 0;
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ret = acpi_dev_get_property(adev, name, ACPI_TYPE_ANY, &obj);
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if (ret)
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return ret;
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/*
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* The simplest case is when the value is a single reference. Just
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* return that reference then.
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*/
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if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) {
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if (index)
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return -EINVAL;
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ret = acpi_bus_get_device(obj->reference.handle, &device);
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if (ret)
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return ret;
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args->adev = device;
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args->nargs = 0;
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return 0;
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}
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/*
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* If it is not a single reference, then it is a package of
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* references followed by number of ints as follows:
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*
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* Package () { REF, INT, REF, INT, INT }
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*
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* The index argument is then used to determine which reference
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* the caller wants (along with the arguments).
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*/
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if (obj->type != ACPI_TYPE_PACKAGE || index >= obj->package.count)
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return -EPROTO;
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element = obj->package.elements;
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end = element + obj->package.count;
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while (element < end) {
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u32 nargs, i;
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if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
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return -EPROTO;
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ret = acpi_bus_get_device(element->reference.handle, &device);
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if (ret)
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return -ENODEV;
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element++;
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nargs = 0;
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/* assume following integer elements are all args */
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for (i = 0; element + i < end; i++) {
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int type = element[i].type;
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if (type == ACPI_TYPE_INTEGER)
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nargs++;
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else if (type == ACPI_TYPE_LOCAL_REFERENCE)
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break;
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else
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return -EPROTO;
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}
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if (idx++ == index) {
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args->adev = device;
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args->nargs = nargs;
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for (i = 0; i < nargs; i++)
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args->args[i] = element[i].integer.value;
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return 0;
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}
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element += nargs;
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}
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return -EPROTO;
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}
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EXPORT_SYMBOL_GPL(acpi_dev_get_property_reference);
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int acpi_dev_prop_get(struct acpi_device *adev, const char *propname,
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void **valptr)
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{
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return acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
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(const union acpi_object **)valptr);
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}
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int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname,
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enum dev_prop_type proptype, void *val)
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{
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const union acpi_object *obj;
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int ret;
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if (!val)
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return -EINVAL;
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if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) {
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ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_INTEGER, &obj);
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if (ret)
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return ret;
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switch (proptype) {
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case DEV_PROP_U8:
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if (obj->integer.value > U8_MAX)
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return -EOVERFLOW;
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*(u8 *)val = obj->integer.value;
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break;
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case DEV_PROP_U16:
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if (obj->integer.value > U16_MAX)
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return -EOVERFLOW;
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*(u16 *)val = obj->integer.value;
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break;
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case DEV_PROP_U32:
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if (obj->integer.value > U32_MAX)
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return -EOVERFLOW;
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*(u32 *)val = obj->integer.value;
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break;
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default:
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*(u64 *)val = obj->integer.value;
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break;
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}
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} else if (proptype == DEV_PROP_STRING) {
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ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_STRING, &obj);
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if (ret)
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return ret;
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*(char **)val = obj->string.pointer;
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} else {
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ret = -EINVAL;
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}
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return ret;
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}
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static int acpi_copy_property_array_u8(const union acpi_object *items, u8 *val,
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size_t nval)
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{
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int i;
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for (i = 0; i < nval; i++) {
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if (items[i].type != ACPI_TYPE_INTEGER)
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return -EPROTO;
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if (items[i].integer.value > U8_MAX)
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return -EOVERFLOW;
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val[i] = items[i].integer.value;
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}
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return 0;
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}
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static int acpi_copy_property_array_u16(const union acpi_object *items,
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u16 *val, size_t nval)
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{
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int i;
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for (i = 0; i < nval; i++) {
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if (items[i].type != ACPI_TYPE_INTEGER)
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return -EPROTO;
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if (items[i].integer.value > U16_MAX)
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return -EOVERFLOW;
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val[i] = items[i].integer.value;
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}
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return 0;
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}
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static int acpi_copy_property_array_u32(const union acpi_object *items,
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u32 *val, size_t nval)
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{
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int i;
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for (i = 0; i < nval; i++) {
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if (items[i].type != ACPI_TYPE_INTEGER)
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return -EPROTO;
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if (items[i].integer.value > U32_MAX)
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return -EOVERFLOW;
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val[i] = items[i].integer.value;
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}
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return 0;
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}
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static int acpi_copy_property_array_u64(const union acpi_object *items,
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u64 *val, size_t nval)
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{
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int i;
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for (i = 0; i < nval; i++) {
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if (items[i].type != ACPI_TYPE_INTEGER)
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return -EPROTO;
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val[i] = items[i].integer.value;
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}
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return 0;
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}
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static int acpi_copy_property_array_string(const union acpi_object *items,
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char **val, size_t nval)
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{
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int i;
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for (i = 0; i < nval; i++) {
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if (items[i].type != ACPI_TYPE_STRING)
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return -EPROTO;
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val[i] = items[i].string.pointer;
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}
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return 0;
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}
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int acpi_dev_prop_read(struct acpi_device *adev, const char *propname,
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enum dev_prop_type proptype, void *val, size_t nval)
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{
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const union acpi_object *obj;
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const union acpi_object *items;
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int ret;
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if (val && nval == 1) {
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ret = acpi_dev_prop_read_single(adev, propname, proptype, val);
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if (!ret)
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return ret;
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}
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ret = acpi_dev_get_property_array(adev, propname, ACPI_TYPE_ANY, &obj);
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if (ret)
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return ret;
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if (!val)
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return obj->package.count;
|
|
else if (nval <= 0)
|
|
return -EINVAL;
|
|
|
|
if (nval > obj->package.count)
|
|
return -EOVERFLOW;
|
|
|
|
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;
|
|
}
|