From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

In all cases in which a struct acpi_driver is used for binding a driver
to an ACPI device object, a corresponding platform device is created by
the ACPI core and that device is regarded as a proper representation of
underlying hardware.  Accordingly, a struct platform_driver should be
used by driver code to bind to that device.  There are multiple reasons
why drivers should not bind directly to ACPI device objects [1].

Overall, it is better to bind drivers to platform devices than to their
ACPI companions, so convert the Toshiba Bluetooth Enable driver from an
ACPI 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.

Link: https://lore.kernel.org/all/2396510.ElGaqSPkdT@rafael.j.wysocki/ [1]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/platform/x86/toshiba_bluetooth.c | 42 ++++++++++++------------
 1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/drivers/platform/x86/toshiba_bluetooth.c b/drivers/platform/x86/toshiba_bluetooth.c
index 3824c2beaf11..e50d4fc1e603 100644
--- a/drivers/platform/x86/toshiba_bluetooth.c
+++ b/drivers/platform/x86/toshiba_bluetooth.c
@@ -17,6 +17,7 @@
 #include <linux/types.h>
 #include <linux/acpi.h>
 #include <linux/rfkill.h>
+#include <linux/platform_device.h>
 
 #define BT_KILLSWITCH_MASK	0x01
 #define BT_PLUGGED_MASK		0x40
@@ -35,8 +36,8 @@ struct toshiba_bluetooth_dev {
 	bool powered;
 };
 
-static int toshiba_bt_rfkill_add(struct acpi_device *device);
-static void toshiba_bt_rfkill_remove(struct acpi_device *device);
+static int toshiba_bt_rfkill_probe(struct platform_device *pdev);
+static void toshiba_bt_rfkill_remove(struct platform_device *pdev);
 static void toshiba_bt_rfkill_notify(acpi_handle handle, u32 event, void *data);
 
 static const struct acpi_device_id bt_device_ids[] = {
@@ -50,15 +51,14 @@ static int toshiba_bt_resume(struct device *dev);
 #endif
 static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
 
-static struct acpi_driver toshiba_bt_rfkill_driver = {
-	.name =		"Toshiba BT",
-	.class =	"Toshiba",
-	.ids =		bt_device_ids,
-	.ops =		{
-				.add =		toshiba_bt_rfkill_add,
-				.remove =	toshiba_bt_rfkill_remove,
-			},
-	.drv.pm =	&toshiba_bt_pm,
+static struct platform_driver toshiba_bt_rfkill_driver = {
+	.probe = toshiba_bt_rfkill_probe,
+	.remove = toshiba_bt_rfkill_remove,
+	.driver = {
+		.name = "Toshiba BT",
+		.acpi_match_table = bt_device_ids,
+		.pm = &toshiba_bt_pm,
+	},
 };
 
 static int toshiba_bluetooth_present(acpi_handle handle)
@@ -215,11 +215,9 @@ static void toshiba_bt_rfkill_notify(acpi_handle handle, u32 event, void *data)
 #ifdef CONFIG_PM_SLEEP
 static int toshiba_bt_resume(struct device *dev)
 {
-	struct toshiba_bluetooth_dev *bt_dev;
+	struct toshiba_bluetooth_dev *bt_dev = dev_get_drvdata(dev);
 	int ret;
 
-	bt_dev = acpi_driver_data(to_acpi_device(dev));
-
 	ret = toshiba_bluetooth_sync_status(bt_dev);
 	if (ret)
 		return ret;
@@ -230,8 +228,9 @@ static int toshiba_bt_resume(struct device *dev)
 }
 #endif
 
-static int toshiba_bt_rfkill_add(struct acpi_device *device)
+static int toshiba_bt_rfkill_probe(struct platform_device *pdev)
 {
+	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
 	struct toshiba_bluetooth_dev *bt_dev;
 	int result;
 
@@ -245,8 +244,8 @@ static int toshiba_bt_rfkill_add(struct acpi_device *device)
 	if (!bt_dev)
 		return -ENOMEM;
 	bt_dev->acpi_dev = device;
-	device->driver_data = bt_dev;
-	dev_set_drvdata(&device->dev, bt_dev);
+
+	platform_set_drvdata(pdev, bt_dev);
 
 	result = toshiba_bluetooth_sync_status(bt_dev);
 	if (result) {
@@ -255,7 +254,7 @@ static int toshiba_bt_rfkill_add(struct acpi_device *device)
 	}
 
 	bt_dev->rfk = rfkill_alloc("Toshiba Bluetooth",
-				   &device->dev,
+				   &pdev->dev,
 				   RFKILL_TYPE_BLUETOOTH,
 				   &rfk_ops,
 				   bt_dev);
@@ -291,9 +290,10 @@ static int toshiba_bt_rfkill_add(struct acpi_device *device)
 	return result;
 }
 
-static void toshiba_bt_rfkill_remove(struct acpi_device *device)
+static void toshiba_bt_rfkill_remove(struct platform_device *pdev)
 {
-	struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
+	struct toshiba_bluetooth_dev *bt_dev = platform_get_drvdata(pdev);
+	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
 
 	/* clean up */
 	acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
@@ -309,4 +309,4 @@ static void toshiba_bt_rfkill_remove(struct acpi_device *device)
 	toshiba_bluetooth_disable(device->handle);
 }
 
-module_acpi_driver(toshiba_bt_rfkill_driver);
+module_platform_driver(toshiba_bt_rfkill_driver);
-- 
2.51.0