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 
18 struct int3402_thermal_data {
19 	acpi_handle *handle;
20 	struct int34x_thermal_zone *int340x_zone;
21 };
22 
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 
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 (!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 
74 static 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 
85 static const struct acpi_device_id int3402_thermal_match[] = {
86 	{"INT3402", 0},
87 	{}
88 };
89 
90 MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
91 
92 static 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 
101 module_platform_driver(int3402_thermal_driver);
102 
103 MODULE_DESCRIPTION("INT3402 Thermal driver");
104 MODULE_LICENSE("GPL");
105