drivers/platform/x86/intel-smartconnect.c

   1 /*
   2  *  Copyright 2013 Matthew Garrett <mjg59@srcf.ucam.org>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License along
  15  *  with this program; if not, write to the Free Software Foundation, Inc.,
  16  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <acpi/acpi_drivers.h>
  23
  24 MODULE_LICENSE("GPL");
  25
  26 static int smartconnect_acpi_init(struct acpi_device *acpi)
  27 {
  28         struct acpi_object_list input;
  29         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  30         union acpi_object *result;
  31         union acpi_object param;
  32         acpi_status status;
  33
  34         status = acpi_evaluate_object(acpi->handle, "GAOS", NULL, &output);
  35         if (!ACPI_SUCCESS(status))
  36                 return -EINVAL;
  37
  38         result = output.pointer;
  39
  40         if (result->type != ACPI_TYPE_INTEGER) {
  41                 kfree(result);
  42                 return -EINVAL;
  43         }
  44
  45         if (result->integer.value & 0x1) {
  46                 param.type = ACPI_TYPE_INTEGER;
  47                 param.integer.value = 0;
  48
  49                 input.count = 1;
  50                 input.pointer = &param;
  51
  52                 dev_info(&acpi->dev, "Disabling Intel Smart Connect\n");
  53                 status = acpi_evaluate_object(acpi->handle, "SAOS", &input,
  54                                               NULL);
  55         }
  56
  57         kfree(result);
  58
  59         return 0;
  60 }
  61
  62 static const struct acpi_device_id smartconnect_ids[] = {
  63         {"INT33A0", 0},
  64         {"", 0}
  65 };
  66
  67 static struct acpi_driver smartconnect_driver = {
  68         .owner = THIS_MODULE,
  69         .name = "intel_smart_connect",
  70         .class = "intel_smart_connect",
  71         .ids = smartconnect_ids,
  72         .ops = {
  73                 .add = smartconnect_acpi_init,
  74         },
  75 };
  76
  77 static int smartconnect_init(void)
  78 {
  79         return acpi_bus_register_driver(&smartconnect_driver);
  80 }
  81
  82 static void smartconnect_exit(void)
  83 {
  84         acpi_bus_unregister_driver(&smartconnect_driver);
  85 }
  86
  87 module_init(smartconnect_init);
  88 module_exit(smartconnect_exit);
  89
  90 MODULE_DEVICE_TABLE(acpi, smartconnect_ids);