1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright(c) 2021 Intel Corporation. All rights reserved. */
3
4#include <linux/platform_device.h>
5#include <linux/device.h>
6#include <linux/acpi.h>
7#include <cxl.h>
8#include "test/mock.h"
9
10struct acpi_device *to_cxl_host_bridge(struct device *host, struct device *dev)
11{
12	int index;
13	struct acpi_device *adev, *found = NULL;
14	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
15
16	if (ops && ops->is_mock_bridge(dev)) {
17		found = ACPI_COMPANION(dev);
18		goto out;
19	}
20
21	if (dev->bus == &platform_bus_type)
22		goto out;
23
24	adev = to_acpi_device(dev);
25	if (!acpi_pci_find_root(adev->handle))
26		goto out;
27
28	if (strcmp(acpi_device_hid(adev), "ACPI0016") == 0) {
29		found = adev;
30		dev_dbg(host, "found host bridge %s\n", dev_name(&adev->dev));
31	}
32out:
33	put_cxl_mock_ops(index);
34	return found;
35}
36