[PATCH v1 5/6] platform/chrome: wilco_ec: event: Register ACPI notify handler

["Rafael J. Wysocki" <rafael@kernel.org>]

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

To facilitate subsequent conversion of the driver to a platform one,
make it install an ACPI notify handler directly instead of using
a .notify() callback in struct acpi_driver.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/platform/chrome/wilco_ec/event.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/chrome/wilco_ec/event.c b/drivers/platform/chrome/wilco_ec/event.c
index 743cd4839bff..f4500dd05f93 100644
--- a/drivers/platform/chrome/wilco_ec/event.c
+++ b/drivers/platform/chrome/wilco_ec/event.c
@@ -253,14 +253,16 @@ static int enqueue_events(struct acpi_device *adev, const u8 *buf, u32 length)
 
 /**
  * event_device_notify() - Callback when EC generates an event over ACPI.
- * @adev: The device that the event is coming from.
+ * @handle: ACPI handle of the device that the event is coming from.
  * @value: Value passed to Notify() in ACPI.
+ * @data: Notify handler data.
  *
  * This function will read the events from the device and enqueue them.
  */
-static void event_device_notify(struct acpi_device *adev, u32 value)
+static void event_device_notify(acpi_handle handle, u32 value, void *data)
 {
 	struct acpi_buffer event_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	struct acpi_device *adev = data;
 	union acpi_object *obj;
 	acpi_status status;
 
@@ -489,8 +491,16 @@ static int event_device_add(struct acpi_device *adev)
 	if (error)
 		goto free_dev_data;
 
+	/* Install an ACPI notify handler. */
+	error = acpi_dev_install_notify_handler(adev, ACPI_DEVICE_NOTIFY,
+						event_device_notify, adev);
+	if (error)
+		goto free_cdev;
+
 	return 0;
 
+free_cdev:
+	cdev_device_del(&dev_data->cdev, &dev_data->dev);
 free_dev_data:
 	hangup_device(dev_data);
 free_minor:
@@ -502,6 +512,8 @@ static void event_device_remove(struct acpi_device *adev)
 {
 	struct event_device_data *dev_data = adev->driver_data;
 
+	acpi_dev_remove_notify_handler(adev, ACPI_DEVICE_NOTIFY,
+				       event_device_notify);
 	cdev_device_del(&dev_data->cdev, &dev_data->dev);
 	ida_free(&event_ida, MINOR(dev_data->dev.devt));
 	hangup_device(dev_data);
@@ -519,7 +531,6 @@ static struct acpi_driver event_driver = {
 	.ids = event_acpi_ids,
 	.ops = {
 		.add = event_device_add,
-		.notify = event_device_notify,
 		.remove = event_device_remove,
 	},
 };
-- 
2.51.0