ACPI: thermal: Convert the driver to a platform one

While binding drivers directly to struct acpi_device objects allows
basic functionality to be provided, at least in the majority of cases,
there are some problems with it, related to general consistency, sysfs
layout, power management operation ordering, and code cleanliness.

Overall, it is better to bind drivers to platform devices than to their
ACPI companions, so convert the ACPI thermal zone driver to a platform
one.

While this is not expected to alter functionality, it changes sysfs
layout and so it will be visible to user space.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: lihuisong@huawei.com
Link: https://patch.msgid.link/2249483.irdbgypaU6@rafael.j.wysocki

Author: rafaeljw

drivers/acpi/thermal.c

@@ -25,6 +25,7 @@
 #include <linux/kmod.h>
 #include <linux/reboot.h>
 #include <linux/device.h>
+#include <linux/platform_device.h>
 #include <linux/thermal.h>
 #include <linux/acpi.h>
 #include <linux/workqueue.h>
@@ -776,9 +777,10 @@ static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz)
 	kfree(tz);
 }
 
-static int acpi_thermal_add(struct acpi_device *device)
+static int acpi_thermal_probe(struct platform_device *pdev)
 {
 	struct thermal_trip trip_table[ACPI_THERMAL_MAX_NR_TRIPS] = { 0 };
+	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
 	struct acpi_thermal_trip *acpi_trip;
 	struct thermal_trip *trip;
 	struct acpi_thermal *tz;
@@ -794,11 +796,12 @@ static int acpi_thermal_add(struct acpi_device *device)
 	if (!tz)
 		return -ENOMEM;
 
+	platform_set_drvdata(pdev, tz);
+
 	tz->device = device;
 	strscpy(tz->name, device->pnp.bus_id);
 	strscpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
 	strscpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
-	device->driver_data = tz;
 
 	acpi_thermal_aml_dependency_fix(tz);
 
@@ -895,16 +898,11 @@ static int acpi_thermal_add(struct acpi_device *device)
 	return result;
 }
 
-static void acpi_thermal_remove(struct acpi_device *device)
+static void acpi_thermal_remove(struct platform_device *pdev)
 {
-	struct acpi_thermal *tz;
-
-	if (!device || !acpi_driver_data(device))
-		return;
+	struct acpi_thermal *tz = platform_get_drvdata(pdev);
 
-	tz = acpi_driver_data(device);
-
-	acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
+	acpi_dev_remove_notify_handler(tz->device, ACPI_DEVICE_NOTIFY,
 				       acpi_thermal_notify);
 
 	flush_workqueue(acpi_thermal_pm_queue);
@@ -922,16 +920,9 @@ static int acpi_thermal_suspend(struct device *dev)
 
 static int acpi_thermal_resume(struct device *dev)
 {
-	struct acpi_thermal *tz;
+	struct acpi_thermal *tz = dev_get_drvdata(dev);
 	int i, j;
 
-	if (!dev)
-		return -EINVAL;
-
-	tz = acpi_driver_data(to_acpi_device(dev));
-	if (!tz)
-		return -EINVAL;
-
 	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 		struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip;
 
@@ -958,15 +949,14 @@ static const struct acpi_device_id  thermal_device_ids[] = {
 };
 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 
-static struct acpi_driver acpi_thermal_driver = {
-	.name = "thermal",
-	.class = ACPI_THERMAL_CLASS,
-	.ids = thermal_device_ids,
-	.ops = {
-		.add = acpi_thermal_add,
-		.remove = acpi_thermal_remove,
-		},
-	.drv.pm = &acpi_thermal_pm,
+static struct platform_driver acpi_thermal_driver = {
+	.probe = acpi_thermal_probe,
+	.remove = acpi_thermal_remove,
+	.driver = {
+		.name = "acpi-thermal",
+		.acpi_match_table = thermal_device_ids,
+		.pm = &acpi_thermal_pm,
+	},
 };
 
 static int thermal_act(const struct dmi_system_id *d)
@@ -1064,7 +1054,7 @@ static int __init acpi_thermal_init(void)
 	if (!acpi_thermal_pm_queue)
 		return -ENODEV;
 
-	result = acpi_bus_register_driver(&acpi_thermal_driver);
+	result = platform_driver_register(&acpi_thermal_driver);
 	if (result < 0) {
 		destroy_workqueue(acpi_thermal_pm_queue);
 		return -ENODEV;
@@ -1075,7 +1065,7 @@ static int __init acpi_thermal_init(void)
 
 static void __exit acpi_thermal_exit(void)
 {
-	acpi_bus_unregister_driver(&acpi_thermal_driver);
+	platform_driver_unregister(&acpi_thermal_driver);
 	destroy_workqueue(acpi_thermal_pm_queue);
 }