drivers/thermal/int340x_thermal/int3402_thermal.c

   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");