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 
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 						   THERMAL_TRIP_VIOLATED);
40 		break;
41 	default:
42 		break;
43 	}
44 }
45 
46 static int int3402_thermal_probe(struct platform_device *pdev)
47 {
48 	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
49 	struct int3402_thermal_data *d;
50 	int ret;
51 
52 	if (!acpi_has_method(adev->handle, "_TMP"))
53 		return -ENODEV;
54 
55 	d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL);
56 	if (!d)
57 		return -ENOMEM;
58 
59 	d->int340x_zone = int340x_thermal_zone_add(adev, NULL);
60 	if (IS_ERR(d->int340x_zone))
61 		return PTR_ERR(d->int340x_zone);
62 
63 	ret = acpi_install_notify_handler(adev->handle,
64 					  ACPI_DEVICE_NOTIFY,
65 					  int3402_notify,
66 					  d);
67 	if (ret) {
68 		int340x_thermal_zone_remove(d->int340x_zone);
69 		return ret;
70 	}
71 
72 	d->handle = adev->handle;
73 	platform_set_drvdata(pdev, d);
74 
75 	return 0;
76 }
77 
78 static int int3402_thermal_remove(struct platform_device *pdev)
79 {
80 	struct int3402_thermal_data *d = platform_get_drvdata(pdev);
81 
82 	acpi_remove_notify_handler(d->handle,
83 				   ACPI_DEVICE_NOTIFY, int3402_notify);
84 	int340x_thermal_zone_remove(d->int340x_zone);
85 
86 	return 0;
87 }
88 
89 static const struct acpi_device_id int3402_thermal_match[] = {
90 	{"INT3402", 0},
91 	{}
92 };
93 
94 MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
95 
96 static struct platform_driver int3402_thermal_driver = {
97 	.probe = int3402_thermal_probe,
98 	.remove = int3402_thermal_remove,
99 	.driver = {
100 		   .name = "int3402 thermal",
101 		   .acpi_match_table = int3402_thermal_match,
102 		   },
103 };
104 
105 module_platform_driver(int3402_thermal_driver);
106 
107 MODULE_DESCRIPTION("INT3402 Thermal driver");
108 MODULE_LICENSE("GPL");
109