drivers/acpi/hed.c

   1 /*
   2  * ACPI Hardware Error Device (PNP0C33) Driver
   3  *
   4  * Copyright (C) 2010, Intel Corp.
   5  *      Author: Huang Ying <ying.huang@intel.com>
   6  *
   7  * ACPI Hardware Error Device is used to report some hardware errors
   8  * notified via SCI, mainly the corrected errors.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License version
  12  * 2 as published by the Free Software Foundation;
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/acpi.h>
  28 #include <acpi/hed.h>
  29
  30 static struct acpi_device_id acpi_hed_ids[] = {
  31         {"PNP0C33", 0},
  32         {"", 0},
  33 };
  34 MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);
  35
  36 static acpi_handle hed_handle;
  37
  38 static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);
  39
  40 int register_acpi_hed_notifier(struct notifier_block *nb)
  41 {
  42         return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
  43 }
  44 EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);
  45
  46 void unregister_acpi_hed_notifier(struct notifier_block *nb)
  47 {
  48         blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
  49 }
  50 EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);
  51
  52 /*
  53  * SCI to report hardware error is forwarded to the listeners of HED,
  54  * it is used by HEST Generic Hardware Error Source with notify type
  55  * SCI.
  56  */
  57 static void acpi_hed_notify(struct acpi_device *device, u32 event)
  58 {
  59         blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
  60 }
  61
  62 static int acpi_hed_add(struct acpi_device *device)
  63 {
  64         /* Only one hardware error device */
  65         if (hed_handle)
  66                 return -EINVAL;
  67         hed_handle = device->handle;
  68         return 0;
  69 }
  70
  71 static int acpi_hed_remove(struct acpi_device *device)
  72 {
  73         hed_handle = NULL;
  74         return 0;
  75 }
  76
  77 static struct acpi_driver acpi_hed_driver = {
  78         .name = "hardware_error_device",
  79         .class = "hardware_error",
  80         .ids = acpi_hed_ids,
  81         .ops = {
  82                 .add = acpi_hed_add,
  83                 .remove = acpi_hed_remove,
  84                 .notify = acpi_hed_notify,
  85         },
  86 };
  87 module_acpi_driver(acpi_hed_driver);
  88
  89 ACPI_MODULE_NAME("hed");
  90 MODULE_AUTHOR("Huang Ying");
  91 MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
  92 MODULE_LICENSE("GPL");