1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * INT3402 thermal driver for memory temperature reporting
4 *
5 * Copyright (C) 2014, Intel Corporation
6 * Authors: Aaron Lu <[email protected]>
7 */
8
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/acpi.h>
12 #include <linux/thermal.h>
13 #include "int340x_thermal_zone.h"
14
15 #define INT3402_PERF_CHANGED_EVENT 0x80
16 #define INT3402_THERMAL_EVENT 0x90
17
18 struct int3402_thermal_data {
19 acpi_handle *handle;
20 struct int34x_thermal_zone *int340x_zone;
21 };
22
int3402_notify(acpi_handle handle,u32 event,void * data)23 static void int3402_notify(acpi_handle handle, u32 event, void *data)
24 {
25 struct int3402_thermal_data *priv = data;
26
27 if (!priv)
28 return;
29
30 switch (event) {
31 case INT3402_PERF_CHANGED_EVENT:
32 break;
33 case INT3402_THERMAL_EVENT:
34 int340x_thermal_zone_device_update(priv->int340x_zone,
35 THERMAL_TRIP_VIOLATED);
36 break;
37 default:
38 break;
39 }
40 }
41
int3402_thermal_probe(struct platform_device * pdev)42 static int int3402_thermal_probe(struct platform_device *pdev)
43 {
44 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
45 struct int3402_thermal_data *d;
46 int ret;
47
48 if (!adev)
49 return -ENODEV;
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 void 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
86 static const struct acpi_device_id int3402_thermal_match[] = {
87 {"INT3402", 0},
88 {}
89 };
90
91 MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
92
93 static struct platform_driver int3402_thermal_driver = {
94 .probe = int3402_thermal_probe,
95 .remove = int3402_thermal_remove,
96 .driver = {
97 .name = "int3402 thermal",
98 .acpi_match_table = int3402_thermal_match,
99 },
100 };
101
102 module_platform_driver(int3402_thermal_driver);
103
104 MODULE_DESCRIPTION("INT3402 Thermal driver");
105 MODULE_LICENSE("GPL");
106