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 <linux/acpi.h>
  23
  24 MODULE_LICENSE("GPL");
  25
  26 static int smartconnect_acpi_init(struct acpi_device *acpi)
  27 {
  28         unsigned long long value;
  29         acpi_status status;
  30
  31         status = acpi_evaluate_integer(acpi->handle, "GAOS", NULL, &value);
  32         if (!ACPI_SUCCESS(status))
  33                 return -EINVAL;
  34
  35         if (value & 0x1) {
  36                 dev_info(&acpi->dev, "Disabling Intel Smart Connect\n");
  37                 status = acpi_execute_simple_method(acpi->handle, "SAOS", 0);
  38         }
  39
  40         return 0;
  41 }
  42
  43 static const struct acpi_device_id smartconnect_ids[] = {
  44         {"INT33A0", 0},
  45         {"", 0}
  46 };
  47
  48 static struct acpi_driver smartconnect_driver = {
  49         .owner = THIS_MODULE,
  50         .name = "intel_smart_connect",
  51         .class = "intel_smart_connect",
  52         .ids = smartconnect_ids,
  53         .ops = {
  54                 .add = smartconnect_acpi_init,
  55         },
  56 };
  57
  58 module_acpi_driver(smartconnect_driver);
  59
  60 MODULE_DEVICE_TABLE(acpi, smartconnect_ids);