drivers/s390/s390_rdev.c

   1 /*
   2  *  drivers/s390/s390_rdev.c
   3  *  s390 root device
   4  *   $Revision: 1.2 $
   5  *
   6  *    Copyright (C) 2002, 2005 IBM Deutschland Entwicklung GmbH,
   7  *                       IBM Corporation
   8  *    Author(s): Cornelia Huck (cohuck@de.ibm.com)
   9  *                Carsten Otte  (cotte@de.ibm.com)
  10  */
  11
  12 #include <linux/slab.h>
  13 #include <linux/err.h>
  14 #include <linux/device.h>
  15 #include <asm/s390_rdev.h>
  16
  17 static void
  18 s390_root_dev_release(struct device *dev)
  19 {
  20         kfree(dev);
  21 }
  22
  23 struct device *
  24 s390_root_dev_register(const char *name)
  25 {
  26         struct device *dev;
  27         int ret;
  28
  29         if (!strlen(name))
  30                 return ERR_PTR(-EINVAL);
  31         dev = kmalloc(sizeof(struct device), GFP_KERNEL);
  32         if (!dev)
  33                 return ERR_PTR(-ENOMEM);
  34         memset(dev, 0, sizeof(struct device));
  35         strncpy(dev->bus_id, name, min(strlen(name), (size_t)BUS_ID_SIZE));
  36         dev->release = s390_root_dev_release;
  37         ret = device_register(dev);
  38         if (ret) {
  39                 kfree(dev);
  40                 return ERR_PTR(ret);
  41         }
  42         return dev;
  43 }
  44
  45 void
  46 s390_root_dev_unregister(struct device *dev)
  47 {
  48         if (dev)
  49                 device_unregister(dev);
  50 }
  51
  52 EXPORT_SYMBOL(s390_root_dev_register);
  53 EXPORT_SYMBOL(s390_root_dev_unregister);