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
22 struct int3402_thermal_data {
23 acpi_handle *handle;
24 struct int34x_thermal_zone *int340x_zone;
25 };
26
int3402_notify(acpi_handle handle,u32 event,void * data)27 static 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 THERMAL_TRIP_VIOLATED);
40 break;
41 default:
42 break;
43 }
44 }
45
int3402_thermal_probe(struct platform_device * pdev)46 static int int3402_thermal_probe(struct platform_device *pdev)
47 {
48 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
49 struct int3402_thermal_data *d;
50 int ret;
51
52 if (!acpi_has_method(adev->handle, "_TMP"))
53 return -ENODEV;
54
55 d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL);
56 if (!d)
57 return -ENOMEM;
58
59 d->int340x_zone = int340x_thermal_zone_add(adev, NULL);
60 if (IS_ERR(d->int340x_zone))
61 return PTR_ERR(d->int340x_zone);
62
63 ret = acpi_install_notify_handler(adev->handle,
64 ACPI_DEVICE_NOTIFY,
65 int3402_notify,
66 d);
67 if (ret) {
68 int340x_thermal_zone_remove(d->int340x_zone);
69 return ret;
70 }
71
72 d->handle = adev->handle;
73 platform_set_drvdata(pdev, d);
74
75 return 0;
76 }
77
int3402_thermal_remove(struct platform_device * pdev)78 static int int3402_thermal_remove(struct platform_device *pdev)
79 {
80 struct int3402_thermal_data *d = platform_get_drvdata(pdev);
81
82 acpi_remove_notify_handler(d->handle,
83 ACPI_DEVICE_NOTIFY, int3402_notify);
84 int340x_thermal_zone_remove(d->int340x_zone);
85
86 return 0;
87 }
88
89 static const struct acpi_device_id int3402_thermal_match[] = {
90 {"INT3402", 0},
91 {}
92 };
93
94 MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
95
96 static struct platform_driver int3402_thermal_driver = {
97 .probe = int3402_thermal_probe,
98 .remove = int3402_thermal_remove,
99 .driver = {
100 .name = "int3402 thermal",
101 .acpi_match_table = int3402_thermal_match,
102 },
103 };
104
105 module_platform_driver(int3402_thermal_driver);
106
107 MODULE_DESCRIPTION("INT3402 Thermal driver");
108 MODULE_LICENSE("GPL");
109