1/*
2 * INT3402 thermal driver for memory temperature reporting
3 *
4 * Copyright (C) 2014, Intel Corporation
5 * Authors: Aaron Lu <aaron.lu@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/acpi.h>
16#include <linux/thermal.h>
17#include "int340x_thermal_zone.h"
18
19#define INT3402_PERF_CHANGED_EVENT	0x80
20#define INT3402_THERMAL_EVENT		0x90
21
22struct int3402_thermal_data {
23	acpi_handle *handle;
24	struct int34x_thermal_zone *int340x_zone;
25};
26
27static void int3402_notify(acpi_handle handle, u32 event, void *data)
28{
29	struct int3402_thermal_data *priv = data;
30
31	if (!priv)
32		return;
33
34	switch (event) {
35	case INT3402_PERF_CHANGED_EVENT:
36		break;
37	case INT3402_THERMAL_EVENT:
38		int340x_thermal_zone_device_update(priv->int340x_zone);
39		break;
40	default:
41		break;
42	}
43}
44
45static int int3402_thermal_probe(struct platform_device *pdev)
46{
47	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
48	struct int3402_thermal_data *d;
49	int ret;
50
51	if (!acpi_has_method(adev->handle, "_TMP"))
52		return -ENODEV;
53
54	d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL);
55	if (!d)
56		return -ENOMEM;
57
58	d->int340x_zone = int340x_thermal_zone_add(adev, NULL);
59	if (IS_ERR(d->int340x_zone))
60		return PTR_ERR(d->int340x_zone);
61
62	ret = acpi_install_notify_handler(adev->handle,
63					  ACPI_DEVICE_NOTIFY,
64					  int3402_notify,
65					  d);
66	if (ret) {
67		int340x_thermal_zone_remove(d->int340x_zone);
68		return ret;
69	}
70
71	d->handle = adev->handle;
72	platform_set_drvdata(pdev, d);
73
74	return 0;
75}
76
77static int int3402_thermal_remove(struct platform_device *pdev)
78{
79	struct int3402_thermal_data *d = platform_get_drvdata(pdev);
80
81	acpi_remove_notify_handler(d->handle,
82				   ACPI_DEVICE_NOTIFY, int3402_notify);
83	int340x_thermal_zone_remove(d->int340x_zone);
84
85	return 0;
86}
87
88static const struct acpi_device_id int3402_thermal_match[] = {
89	{"INT3402", 0},
90	{}
91};
92
93MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
94
95static struct platform_driver int3402_thermal_driver = {
96	.probe = int3402_thermal_probe,
97	.remove = int3402_thermal_remove,
98	.driver = {
99		   .name = "int3402 thermal",
100		   .acpi_match_table = int3402_thermal_match,
101		   },
102};
103
104module_platform_driver(int3402_thermal_driver);
105
106MODULE_DESCRIPTION("INT3402 Thermal driver");
107MODULE_LICENSE("GPL");
108