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(priv->int340x_zone,
35						   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(adev->handle, "_TMP"))
49		return -ENODEV;
50
51	d = devm_kzalloc(&pdev->dev, 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(d->int340x_zone))
57		return PTR_ERR(d->int340x_zone);
58
59	ret = acpi_install_notify_handler(adev->handle,
60					  ACPI_DEVICE_NOTIFY,
61					  int3402_notify,
62					  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, d);
70
71	return 0;
72}
73
74static int int3402_thermal_remove(struct platform_device *pdev)
75{
76	struct int3402_thermal_data *d = platform_get_drvdata(pdev);
77
78	acpi_remove_notify_handler(d->handle,
79				   ACPI_DEVICE_NOTIFY, int3402_notify);
80	int340x_thermal_zone_remove(d->int340x_zone);
81
82	return 0;
83}
84
85static const struct acpi_device_id int3402_thermal_match[] = {
86	{"INT3402", 0},
87	{}
88};
89
90MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
91
92static struct platform_driver int3402_thermal_driver = {
93	.probe = int3402_thermal_probe,
94	.remove = int3402_thermal_remove,
95	.driver = {
96		   .name = "int3402 thermal",
97		   .acpi_match_table = int3402_thermal_match,
98		   },
99};
100
101module_platform_driver(int3402_thermal_driver);
102
103MODULE_DESCRIPTION("INT3402 Thermal driver");
104MODULE_LICENSE("GPL");
105