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 break;
40 default:
41 break;
42 }
43 }
44
int3402_thermal_probe(struct platform_device * pdev)45 static 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
int3402_thermal_remove(struct platform_device * pdev)77 static 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
88 static const struct acpi_device_id int3402_thermal_match[] = {
89 {"INT3402", 0},
90 {}
91 };
92
93 MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
94
95 static 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
104 module_platform_driver(int3402_thermal_driver);
105
106 MODULE_DESCRIPTION("INT3402 Thermal driver");
107 MODULE_LICENSE("GPL");
108