Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * apple.c - Apple ACPI quirks
 * Copyright (C) 2017 Lukas Wunner <lukas@wunner.de>
 */
 
#include <linux/acpi.h>
#include <linux/bitmap.h>
#include <linux/platform_data/x86/apple.h>
#include <linux/uuid.h>
 
/* Apple _DSM device properties GUID */
static const guid_t apple_prp_guid =
<------>GUID_INIT(0xa0b5b7c6, 0x1318, 0x441c,
<------><------>  0xb0, 0xc9, 0xfe, 0x69, 0x5e, 0xaf, 0x94, 0x9b);
 
/**
 * acpi_extract_apple_properties - retrieve and convert Apple _DSM properties
 * @adev: ACPI device for which to retrieve the properties
 *
 * Invoke Apple's custom _DSM once to check the protocol version and once more
 * to retrieve the properties.  They are marshalled up in a single package as
 * alternating key/value elements, unlike _DSD which stores them as a package
 * of 2-element packages.  Convert to _DSD format and make them available under
 * the primary fwnode.
 */
void acpi_extract_apple_properties(struct acpi_device *adev)
{
<------>unsigned int i, j = 0, newsize = 0, numprops, numvalid;
<------>union acpi_object *props, *newprops;
<------>unsigned long *valid = NULL;
<------>void *free_space;
 
<------>if (!x86_apple_machine)
<------><------>return;
 
<------>props = acpi_evaluate_dsm_typed(adev->handle, &apple_prp_guid, 1, 0,
<------><------><------><------><------>NULL, ACPI_TYPE_BUFFER);
<------>if (!props)
<------><------>return;
 
<------>if (!props->buffer.length)
<------><------>goto out_free;
 
<------>if (props->buffer.pointer[0] != 3) {
<------><------>acpi_handle_info(adev->handle, FW_INFO
<------><------><------><------> "unsupported properties version %*ph\n",
<------><------><------><------> props->buffer.length, props->buffer.pointer);
<------><------>goto out_free;
<------>}
 
<------>ACPI_FREE(props);
<------>props = acpi_evaluate_dsm_typed(adev->handle, &apple_prp_guid, 1, 1,
<------><------><------><------><------>NULL, ACPI_TYPE_PACKAGE);
<------>if (!props)
<------><------>return;
 
<------>numprops = props->package.count / 2;
<------>if (!numprops)
<------><------>goto out_free;
 
<------>valid = bitmap_zalloc(numprops, GFP_KERNEL);
<------>if (!valid)
<------><------>goto out_free;
 
<------>/* newsize = key length + value length of each tuple */
<------>for (i = 0; i < numprops; i++) {
<------><------>union acpi_object *key = &props->package.elements[i * 2];
<------><------>union acpi_object *val = &props->package.elements[i * 2 + 1];
 
<------><------>if ( key->type != ACPI_TYPE_STRING ||
<------><------>    (val->type != ACPI_TYPE_INTEGER &&
<------><------>     val->type != ACPI_TYPE_BUFFER))
<------><------><------>continue; /* skip invalid properties */
 
<------><------>__set_bit(i, valid);
<------><------>newsize += key->string.length + 1;
<------><------>if ( val->type == ACPI_TYPE_BUFFER)
<------><------><------>newsize += val->buffer.length;
<------>}
 
<------>numvalid = bitmap_weight(valid, numprops);
<------>if (numprops > numvalid)
<------><------>acpi_handle_info(adev->handle, FW_INFO
<------><------><------><------> "skipped %u properties: wrong type\n",
<------><------><------><------> numprops - numvalid);
<------>if (numvalid == 0)
<------><------>goto out_free;
 
<------>/* newsize += top-level package + 3 objects for each key/value tuple */
<------>newsize	+= (1 + 3 * numvalid) * sizeof(union acpi_object);
<------>newprops = ACPI_ALLOCATE_ZEROED(newsize);
<------>if (!newprops)
<------><------>goto out_free;
 
<------>/* layout: top-level package | packages | key/value tuples | strings */
<------>newprops->type = ACPI_TYPE_PACKAGE;
<------>newprops->package.count = numvalid;
<------>newprops->package.elements = &newprops[1];
<------>free_space = &newprops[1 + 3 * numvalid];
 
<------>for_each_set_bit(i, valid, numprops) {
<------><------>union acpi_object *key = &props->package.elements[i * 2];
<------><------>union acpi_object *val = &props->package.elements[i * 2 + 1];
<------><------>unsigned int k = 1 + numvalid + j * 2; /* index into newprops */
<------><------>unsigned int v = k + 1;
 
<------><------>newprops[1 + j].type = ACPI_TYPE_PACKAGE;
<------><------>newprops[1 + j].package.count = 2;
<------><------>newprops[1 + j].package.elements = &newprops[k];
 
<------><------>newprops[k].type = ACPI_TYPE_STRING;
<------><------>newprops[k].string.length = key->string.length;
<------><------>newprops[k].string.pointer = free_space;
<------><------>memcpy(free_space, key->string.pointer, key->string.length);
<------><------>free_space += key->string.length + 1;
 
<------><------>newprops[v].type = val->type;
<------><------>if (val->type == ACPI_TYPE_INTEGER) {
<------><------><------>newprops[v].integer.value = val->integer.value;
<------><------>} else {
<------><------><------>newprops[v].buffer.length = val->buffer.length;
<------><------><------>newprops[v].buffer.pointer = free_space;
<------><------><------>memcpy(free_space, val->buffer.pointer,
<------><------><------>       val->buffer.length);
<------><------><------>free_space += val->buffer.length;
<------><------>}
<------><------>j++; /* count valid properties */
<------>}
<------>WARN_ON(free_space != (void *)newprops + newsize);
 
<------>adev->data.pointer = newprops;
<------>acpi_data_add_props(&adev->data, &apple_prp_guid, newprops);
 
out_free:
<------>ACPI_FREE(props);
<------>bitmap_free(valid);
}