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"); 105