]> git.karo-electronics.de Git - karo-tx-linux.git/blob - drivers/platform/x86/intel-smartconnect.c
Merge branch 'for-3.13/core' into for-next
[karo-tx-linux.git] / 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 module_acpi_driver(smartconnect_driver);
78
79 MODULE_DEVICE_TABLE(acpi, smartconnect_ids);