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);