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 <aaron.lu@intel.com>
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
18struct int3402_thermal_data {
19 acpi_handle *handle;
20 struct int34x_thermal_zone *int340x_zone;
21};
22
23static 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(tzone: priv->int340x_zone,
35 event: THERMAL_TRIP_VIOLATED);
36 break;
37 default:
38 break;
39 }
40}
41
42static 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 (!acpi_has_method(handle: adev->handle, name: "_TMP"))
49 return -ENODEV;
50
51 d = devm_kzalloc(dev: &pdev->dev, size: sizeof(*d), GFP_KERNEL);
52 if (!d)
53 return -ENOMEM;
54
55 d->int340x_zone = int340x_thermal_zone_add(adev, NULL);
56 if (IS_ERR(ptr: d->int340x_zone))
57 return PTR_ERR(ptr: d->int340x_zone);
58
59 ret = acpi_install_notify_handler(device: adev->handle,
60 ACPI_DEVICE_NOTIFY,
61 handler: int3402_notify,
62 context: d);
63 if (ret) {
64 int340x_thermal_zone_remove(d->int340x_zone);
65 return ret;
66 }
67
68 d->handle = adev->handle;
69 platform_set_drvdata(pdev, data: d);
70
71 return 0;
72}
73
74static void int3402_thermal_remove(struct platform_device *pdev)
75{
76 struct int3402_thermal_data *d = platform_get_drvdata(pdev);
77
78 acpi_remove_notify_handler(device: d->handle,
79 ACPI_DEVICE_NOTIFY, handler: int3402_notify);
80 int340x_thermal_zone_remove(d->int340x_zone);
81}
82
83static const struct acpi_device_id int3402_thermal_match[] = {
84 {"INT3402", 0},
85 {}
86};
87
88MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
89
90static struct platform_driver int3402_thermal_driver = {
91 .probe = int3402_thermal_probe,
92 .remove_new = int3402_thermal_remove,
93 .driver = {
94 .name = "int3402 thermal",
95 .acpi_match_table = int3402_thermal_match,
96 },
97};
98
99module_platform_driver(int3402_thermal_driver);
100
101MODULE_DESCRIPTION("INT3402 Thermal driver");
102MODULE_LICENSE("GPL");
103

source code of linux/drivers/thermal/intel/int340x_thermal/int3402_thermal.c