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Linux/drivers/platform/x86/pvpanic.c

  1 /*
  2  *  pvpanic.c - pvpanic Device Support
  3  *
  4  *  Copyright (C) 2013 Fujitsu.
  5  *
  6  *  This program is free software; you can redistribute it and/or modify
  7  *  it under the terms of the GNU General Public License as published by
  8  *  the Free Software Foundation; either version 2 of the License, or
  9  *  (at your option) any later version.
 10  *
 11  *  This program is distributed in the hope that it will be useful,
 12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *  GNU General Public License for more details.
 15  *
 16  *  You should have received a copy of the GNU General Public License
 17  *  along with this program; if not, write to the Free Software
 18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 19  */
 20 
 21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 22 
 23 #include <linux/kernel.h>
 24 #include <linux/module.h>
 25 #include <linux/init.h>
 26 #include <linux/types.h>
 27 #include <linux/acpi.h>
 28 
 29 MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
 30 MODULE_DESCRIPTION("pvpanic device driver");
 31 MODULE_LICENSE("GPL");
 32 
 33 static int pvpanic_add(struct acpi_device *device);
 34 static int pvpanic_remove(struct acpi_device *device);
 35 
 36 static const struct acpi_device_id pvpanic_device_ids[] = {
 37         { "QEMU0001", 0 },
 38         { "", 0 },
 39 };
 40 MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
 41 
 42 #define PVPANIC_PANICKED        (1 << 0)
 43 
 44 static u16 port;
 45 
 46 static struct acpi_driver pvpanic_driver = {
 47         .name =         "pvpanic",
 48         .class =        "QEMU",
 49         .ids =          pvpanic_device_ids,
 50         .ops =          {
 51                                 .add =          pvpanic_add,
 52                                 .remove =       pvpanic_remove,
 53                         },
 54         .owner =        THIS_MODULE,
 55 };
 56 
 57 static void
 58 pvpanic_send_event(unsigned int event)
 59 {
 60         outb(event, port);
 61 }
 62 
 63 static int
 64 pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
 65                      void *unused)
 66 {
 67         pvpanic_send_event(PVPANIC_PANICKED);
 68         return NOTIFY_DONE;
 69 }
 70 
 71 static struct notifier_block pvpanic_panic_nb = {
 72         .notifier_call = pvpanic_panic_notify,
 73         .priority = 1, /* let this called before broken drm_fb_helper */
 74 };
 75 
 76 
 77 static acpi_status
 78 pvpanic_walk_resources(struct acpi_resource *res, void *context)
 79 {
 80         switch (res->type) {
 81         case ACPI_RESOURCE_TYPE_END_TAG:
 82                 return AE_OK;
 83 
 84         case ACPI_RESOURCE_TYPE_IO:
 85                 port = res->data.io.minimum;
 86                 return AE_OK;
 87 
 88         default:
 89                 return AE_ERROR;
 90         }
 91 }
 92 
 93 static int pvpanic_add(struct acpi_device *device)
 94 {
 95         acpi_status status;
 96         u64 ret;
 97 
 98         status = acpi_evaluate_integer(device->handle, "_STA", NULL,
 99                                        &ret);
100 
101         if (ACPI_FAILURE(status) || (ret & 0x0B) != 0x0B)
102                 return -ENODEV;
103 
104         acpi_walk_resources(device->handle, METHOD_NAME__CRS,
105                             pvpanic_walk_resources, NULL);
106 
107         if (!port)
108                 return -ENODEV;
109 
110         atomic_notifier_chain_register(&panic_notifier_list,
111                                        &pvpanic_panic_nb);
112 
113         return 0;
114 }
115 
116 static int pvpanic_remove(struct acpi_device *device)
117 {
118 
119         atomic_notifier_chain_unregister(&panic_notifier_list,
120                                          &pvpanic_panic_nb);
121         return 0;
122 }
123 
124 module_acpi_driver(pvpanic_driver);
125 

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