cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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int3402_thermal.c (2328B)

      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
     18struct int3402_thermal_data {
     19	acpi_handle *handle;
     20	struct int34x_thermal_zone *int340x_zone;
     21};
     22
     23static 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
     42static 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
     74static 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
     85static const struct acpi_device_id int3402_thermal_match[] = {
     86	{"INT3402", 0},
     87	{}
     88};
     89
     90MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
     91
     92static 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
    101module_platform_driver(int3402_thermal_driver);
    102
    103MODULE_DESCRIPTION("INT3402 Thermal driver");
    104MODULE_LICENSE("GPL");