drivers/nvdimm/core.c

   1 /*
   2  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13 #include <linux/libnvdimm.h>
  14 #include <linux/export.h>
  15 #include <linux/module.h>
  16 #include <linux/device.h>
  17 #include <linux/slab.h>
  18 #include "nd-core.h"
  19
  20 static DEFINE_IDA(nd_ida);
  21
  22 static void nvdimm_bus_release(struct device *dev)
  23 {
  24         struct nvdimm_bus *nvdimm_bus;
  25
  26         nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
  27         ida_simple_remove(&nd_ida, nvdimm_bus->id);
  28         kfree(nvdimm_bus);
  29 }
  30
  31 struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
  32                 struct nvdimm_bus_descriptor *nd_desc)
  33 {
  34         struct nvdimm_bus *nvdimm_bus;
  35         int rc;
  36
  37         nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
  38         if (!nvdimm_bus)
  39                 return NULL;
  40         nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
  41         if (nvdimm_bus->id < 0) {
  42                 kfree(nvdimm_bus);
  43                 return NULL;
  44         }
  45         nvdimm_bus->nd_desc = nd_desc;
  46         nvdimm_bus->dev.parent = parent;
  47         nvdimm_bus->dev.release = nvdimm_bus_release;
  48         dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
  49         rc = device_register(&nvdimm_bus->dev);
  50         if (rc) {
  51                 dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
  52                 put_device(&nvdimm_bus->dev);
  53                 return NULL;
  54         }
  55
  56         return nvdimm_bus;
  57 }
  58 EXPORT_SYMBOL_GPL(nvdimm_bus_register);
  59
  60 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
  61 {
  62         if (!nvdimm_bus)
  63                 return;
  64         device_unregister(&nvdimm_bus->dev);
  65 }
  66 EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
  67
  68 MODULE_LICENSE("GPL v2");
  69 MODULE_AUTHOR("Intel Corporation");