Merge tag 'devdax-for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm...
[muen/linux.git] / drivers / dax / pmem / compat.c
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
13 static 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
35 static 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
44 static 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
50 static 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
59 static int __init dax_pmem_compat_init(void)
60 {
61         return nd_driver_register(&dax_pmem_compat_driver);
62 }
63 module_init(dax_pmem_compat_init);
64
65 static void __exit dax_pmem_compat_exit(void)
66 {
67         driver_unregister(&dax_pmem_compat_driver.drv);
68 }
69 module_exit(dax_pmem_compat_exit);
70
71 MODULE_LICENSE("GPL v2");
72 MODULE_AUTHOR("Intel Corporation");
73 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);