intel/int340x_thermal/int3402_thermal.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * INT3402 thermal driver for memory temperature reporting
0004  *
0005  * Copyright (C) 2014, Intel Corporation
0006  * Authors: Aaron Lu <aaron.lu@intel.com>
0007  */
0008
0009 #include <linux/module.h>
0010 #include <linux/platform_device.h>
0011 #include <linux/acpi.h>
0012 #include <linux/thermal.h>
0013 #include "int340x_thermal_zone.h"
0014
0015 #define INT3402_PERF_CHANGED_EVENT  0x80
0016 #define INT3402_THERMAL_EVENT       0x90
0017
0018 struct int3402_thermal_data {
0019     acpi_handle *handle;
0020     struct int34x_thermal_zone *int340x_zone;
0021 };
0022
0023 static void int3402_notify(acpi_handle handle, u32 event, void *data)
0024 {
0025     struct int3402_thermal_data *priv = data;
0026
0027     if (!priv)
0028         return;
0029
0030     switch (event) {
0031     case INT3402_PERF_CHANGED_EVENT:
0032         break;
0033     case INT3402_THERMAL_EVENT:
0034         int340x_thermal_zone_device_update(priv->int340x_zone,
0035                            THERMAL_TRIP_VIOLATED);
0036         break;
0037     default:
0038         break;
0039     }
0040 }
0041
0042 static int int3402_thermal_probe(struct platform_device *pdev)
0043 {
0044     struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
0045     struct int3402_thermal_data *d;
0046     int ret;
0047
0048     if (!acpi_has_method(adev->handle, "_TMP"))
0049         return -ENODEV;
0050
0051     d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL);
0052     if (!d)
0053         return -ENOMEM;
0054
0055     d->int340x_zone = int340x_thermal_zone_add(adev, NULL);
0056     if (IS_ERR(d->int340x_zone))
0057         return PTR_ERR(d->int340x_zone);
0058
0059     ret = acpi_install_notify_handler(adev->handle,
0060                       ACPI_DEVICE_NOTIFY,
0061                       int3402_notify,
0062                       d);
0063     if (ret) {
0064         int340x_thermal_zone_remove(d->int340x_zone);
0065         return ret;
0066     }
0067
0068     d->handle = adev->handle;
0069     platform_set_drvdata(pdev, d);
0070
0071     return 0;
0072 }
0073
0074 static int int3402_thermal_remove(struct platform_device *pdev)
0075 {
0076     struct int3402_thermal_data *d = platform_get_drvdata(pdev);
0077
0078     acpi_remove_notify_handler(d->handle,
0079                    ACPI_DEVICE_NOTIFY, int3402_notify);
0080     int340x_thermal_zone_remove(d->int340x_zone);
0081
0082     return 0;
0083 }
0084
0085 static const struct acpi_device_id int3402_thermal_match[] = {
0086     {"INT3402", 0},
0087     {}
0088 };
0089
0090 MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
0091
0092 static struct platform_driver int3402_thermal_driver = {
0093     .probe = int3402_thermal_probe,
0094     .remove = int3402_thermal_remove,
0095     .driver = {
0096            .name = "int3402 thermal",
0097            .acpi_match_table = int3402_thermal_match,
0098            },
0099 };
0100
0101 module_platform_driver(int3402_thermal_driver);
0102
0103 MODULE_DESCRIPTION("INT3402 Thermal driver");
0104 MODULE_LICENSE("GPL");