drivers/thermal/intel/int340x_thermal/int3402_thermal.c

   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");