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