misc: pvpanic: Combine ACPI and platform drivers

There is nothing special in the driver that requires to have
a special ACPI driver for it. Combine both into simple
platform driver.

Cc: Peng Hao <peng.hao2@zte.com.cn>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20201209203642.27648-4-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/pvpanic.c

@@ -8,7 +8,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
-#include <linux/acpi.h>
+#include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/kexec.h>
 #include <linux/module.h>
@@ -49,101 +49,16 @@ static struct notifier_block pvpanic_panic_nb = {
 	.priority = 1, /* let this called before broken drm_fb_helper */
 };
 
-#ifdef CONFIG_ACPI
-static int pvpanic_add(struct acpi_device *device);
-static int pvpanic_remove(struct acpi_device *device);
-
-static const struct acpi_device_id pvpanic_device_ids[] = {
-	{ "QEMU0001", 0 },
-	{ "", 0 }
-};
-MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
-
-static struct acpi_driver pvpanic_driver = {
-	.name =		"pvpanic",
-	.class =	"QEMU",
-	.ids =		pvpanic_device_ids,
-	.ops =		{
-				.add =		pvpanic_add,
-				.remove =	pvpanic_remove,
-			},
-	.owner =	THIS_MODULE,
-};
-
-static acpi_status
-pvpanic_walk_resources(struct acpi_resource *res, void *context)
-{
-	struct resource r;
-
-	if (acpi_dev_resource_io(res, &r)) {
-#ifdef CONFIG_HAS_IOPORT_MAP
-		base = ioport_map(r.start, resource_size(&r));
-		return AE_OK;
-#else
-		return AE_ERROR;
-#endif
-	} else if (acpi_dev_resource_memory(res, &r)) {
-		base = ioremap(r.start, resource_size(&r));
-		return AE_OK;
-	}
-
-	return AE_ERROR;
-}
-
-static int pvpanic_add(struct acpi_device *device)
-{
-	int ret;
-
-	ret = acpi_bus_get_status(device);
-	if (ret < 0)
-		return ret;
-
-	if (!device->status.enabled || !device->status.functional)
-		return -ENODEV;
-
-	acpi_walk_resources(device->handle, METHOD_NAME__CRS,
-			    pvpanic_walk_resources, NULL);
-
-	if (!base)
-		return -ENODEV;
-
-	atomic_notifier_chain_register(&panic_notifier_list,
-				       &pvpanic_panic_nb);
-
-	return 0;
-}
-
-static int pvpanic_remove(struct acpi_device *device)
-{
-
-	atomic_notifier_chain_unregister(&panic_notifier_list,
-					 &pvpanic_panic_nb);
-	iounmap(base);
-
-	return 0;
-}
-
-static int pvpanic_register_acpi_driver(void)
-{
-	return acpi_bus_register_driver(&pvpanic_driver);
-}
-
-static void pvpanic_unregister_acpi_driver(void)
-{
-	acpi_bus_unregister_driver(&pvpanic_driver);
-}
-#else
-static int pvpanic_register_acpi_driver(void)
-{
-	return -ENODEV;
-}
-
-static void pvpanic_unregister_acpi_driver(void) {}
-#endif
-
 static int pvpanic_mmio_probe(struct platform_device *pdev)
 {
-	base = devm_platform_ioremap_resource(pdev, 0);
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+
+	res = platform_get_mem_or_io(pdev, 0);
+	if (res && resource_type(res) == IORESOURCE_IO)
+		base = devm_ioport_map(dev, res->start, resource_size(res));
+	else
+		base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
@@ -167,30 +82,19 @@ static const struct of_device_id pvpanic_mmio_match[] = {
 	{}
 };
 
+static const struct acpi_device_id pvpanic_device_ids[] = {
+	{ "QEMU0001", 0 },
+	{ "", 0 }
+};
+MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
+
 static struct platform_driver pvpanic_mmio_driver = {
 	.driver = {
 		.name = "pvpanic-mmio",
 		.of_match_table = pvpanic_mmio_match,
+		.acpi_match_table = pvpanic_device_ids,
 	},
 	.probe = pvpanic_mmio_probe,
 	.remove = pvpanic_mmio_remove,
 };
-
-static int __init pvpanic_mmio_init(void)
-{
-	if (acpi_disabled)
-		return platform_driver_register(&pvpanic_mmio_driver);
-	else
-		return pvpanic_register_acpi_driver();
-}
-
-static void __exit pvpanic_mmio_exit(void)
-{
-	if (acpi_disabled)
-		platform_driver_unregister(&pvpanic_mmio_driver);
-	else
-		pvpanic_unregister_acpi_driver();
-}
-
-module_init(pvpanic_mmio_init);
-module_exit(pvpanic_mmio_exit);
+module_platform_driver(pvpanic_mmio_driver);