1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
 3#include <linux/percpu-refcount.h>
 4#include <linux/memremap.h>
 5#include <linux/module.h>
 6#include <linux/pfn_t.h>
 7#include <linux/nd.h>
 8#include "../bus.h"
 9
10/* we need the private definitions to implement compat suport */
11#include "../dax-private.h"
12
13static int dax_pmem_compat_probe(struct device *dev)
14{
15	struct dev_dax *dev_dax = __dax_pmem_probe(dev, DEV_DAX_CLASS);
16	int rc;
17
18	if (IS_ERR(dev_dax))
19		return PTR_ERR(dev_dax);
20
21        if (!devres_open_group(&dev_dax->dev, dev_dax, GFP_KERNEL))
22		return -ENOMEM;
23
24	device_lock(&dev_dax->dev);
25	rc = dev_dax_probe(&dev_dax->dev);
26	device_unlock(&dev_dax->dev);
27
28	devres_close_group(&dev_dax->dev, dev_dax);
29	if (rc)
30		devres_release_group(&dev_dax->dev, dev_dax);
31
32	return rc;
33}
34
35static int dax_pmem_compat_release(struct device *dev, void *data)
36{
37	device_lock(dev);
38	devres_release_group(dev, to_dev_dax(dev));
39	device_unlock(dev);
40
41	return 0;
42}
43
44static int dax_pmem_compat_remove(struct device *dev)
45{
46	device_for_each_child(dev, NULL, dax_pmem_compat_release);
47	return 0;
48}
49
50static struct nd_device_driver dax_pmem_compat_driver = {
51	.probe = dax_pmem_compat_probe,
52	.remove = dax_pmem_compat_remove,
53	.drv = {
54		.name = "dax_pmem_compat",
55	},
56	.type = ND_DRIVER_DAX_PMEM,
57};
58
59static int __init dax_pmem_compat_init(void)
60{
61	return nd_driver_register(&dax_pmem_compat_driver);
62}
63module_init(dax_pmem_compat_init);
64
65static void __exit dax_pmem_compat_exit(void)
66{
67	driver_unregister(&dax_pmem_compat_driver.drv);
68}
69module_exit(dax_pmem_compat_exit);
70
71MODULE_LICENSE("GPL v2");
72MODULE_AUTHOR("Intel Corporation");
73MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);