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
24MODULE_LICENSE("GPL");
25
26static 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
43static const struct acpi_device_id smartconnect_ids[] = {
44	{"INT33A0", 0},
45	{"", 0}
46};
47
48static 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
58module_acpi_driver(smartconnect_driver);
59
60MODULE_DEVICE_TABLE(acpi, smartconnect_ids);
61