acpi/tiny-power-button: Move handler installing logic to driver

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/acpi/tiny-power-button.c

@@ -19,16 +19,19 @@ static const struct acpi_device_id tiny_power_button_device_ids[] = {
 };
 MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids);
 
-static int acpi_noop_add(struct acpi_device *device)
+static int acpi_tiny_power_button_add(struct acpi_device *device)
 {
-	return 0;
+	return acpi_device_install_event_handler(device, ACPI_DEVICE_NOTIFY,
+						  acpi_tiny_power_button_notify);
 }
 
-static void acpi_noop_remove(struct acpi_device *device)
+static void acpi_tiny_power_button_remove(struct acpi_device *device)
 {
+	acpi_device_remove_event_handler(device->handle, ACPI_DEVICE_NOTIFY,
+					 acpi_tiny_power_button_notify);
 }
 
-static void acpi_tiny_power_button_notify(struct acpi_device *device, u32 event)
+static void acpi_tiny_power_button_notify(acpi_handle handle, u32 event, void *data)
 {
 	kill_cad_pid(power_signal, 1);
 }
@@ -38,9 +41,8 @@ static struct acpi_driver acpi_tiny_power_button_driver = {
 	.class = "tiny-power-button",
 	.ids = tiny_power_button_device_ids,
 	.ops = {
-		.add = acpi_noop_add,
-		.remove = acpi_noop_remove,
-		.notify = acpi_tiny_power_button_notify,
+		.add = acpi_tiny_power_button_add,
+		.remove = acpi_tiny_power_button_remove,
 	},
 };