[PATCH v4 13/35] platform/wilco_ec: Move handler installing logic to driver

[Michal Wilczynski <michal.wilczynski@intel.com>]

Currently logic for installing notifications from ACPI devices is
implemented using notify callback in struct acpi_driver. Preparations
are being made to replace acpi_driver with more generic struct
platform_driver, which doesn't contain notify callback. Furthermore
as of now handlers are being called indirectly through
acpi_notify_device(), which decreases performance.

Call acpi_device_install_event_handler() at the end of .add() callback.
Call acpi_device_remove_event_handler() at the beginning of .remove()
callback. Change arguments passed to the notify callback to match with
what's required by acpi_device_install_event_handler().

Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
---
 drivers/platform/chrome/wilco_ec/event.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/chrome/wilco_ec/event.c b/drivers/platform/chrome/wilco_ec/event.c
index a40f60bcefb6..23fd6de623f4 100644
--- a/drivers/platform/chrome/wilco_ec/event.c
+++ b/drivers/platform/chrome/wilco_ec/event.c
@@ -251,16 +251,10 @@ static int enqueue_events(struct acpi_device *adev, const u8 *buf, u32 length)
 	return 0;
 }
 
-/**
- * event_device_notify() - Callback when EC generates an event over ACPI.
- * @adev: The device that the event is coming from.
- * @value: Value passed to Notify() in ACPI.
- *
- * 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;
 
@@ -490,6 +484,11 @@ static int event_device_add(struct acpi_device *adev)
 	if (error)
 		goto free_dev_data;
 
+	error =  acpi_device_install_event_handler(adev, ACPI_DEVICE_NOTIFY,
+						   event_device_notify);
+	if (error)
+		goto free_dev_data;
+
 	return 0;
 
 free_dev_data:
@@ -503,6 +502,7 @@ static void event_device_remove(struct acpi_device *adev)
 {
 	struct event_device_data *dev_data = adev->driver_data;
 
+	acpi_device_remove_event_handler(adev, ACPI_DEVICE_NOTIFY, event_device_notify);
 	cdev_device_del(&dev_data->cdev, &dev_data->dev);
 	ida_simple_remove(&event_ida, MINOR(dev_data->dev.devt));
 	hangup_device(dev_data);
@@ -520,7 +520,6 @@ static struct acpi_driver event_driver = {
 	.ids = event_acpi_ids,
 	.ops = {
 		.add = event_device_add,
-		.notify = event_device_notify,
 		.remove = event_device_remove,
 	},
 	.owner = THIS_MODULE,
-- 
2.40.1