[PATCH v3 14/34] platform/surface/button: Move handler installing logic to driver

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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@xxxxxxxxx>
---
 drivers/platform/surface/surfacepro3_button.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/surface/surfacepro3_button.c b/drivers/platform/surface/surfacepro3_button.c
index 2755601f979c..a6892242f747 100644
--- a/drivers/platform/surface/surfacepro3_button.c
+++ b/drivers/platform/surface/surfacepro3_button.c
@@ -71,13 +71,16 @@ struct surface_button {
 	bool suspended;
 };
 
-static void surface_button_notify(struct acpi_device *device, u32 event)
+static void surface_button_notify(acpi_handle handle, u32 event, void *data)
 {
-	struct surface_button *button = acpi_driver_data(device);
-	struct input_dev *input;
+	struct acpi_device *device = data;
+	struct surface_button *button;
 	int key_code = KEY_RESERVED;
+	struct input_dev *input;
 	bool pressed = false;
 
+	button = acpi_driver_data(device);
+
 	switch (event) {
 	/* Power button press,release handle */
 	case SURFACE_BUTTON_NOTIFY_PRESS_POWER:
@@ -230,7 +233,13 @@ static int surface_button_add(struct acpi_device *device)
 	device_init_wakeup(&device->dev, true);
 	dev_info(&device->dev,
 			"%s [%s]\n", name, acpi_device_bid(device));
-	return 0;
+
+	error = acpi_device_install_event_handler(device, ACPI_DEVICE_NOTIFY,
+						  surface_button_notify);
+	if (error)
+		goto err_free_input;
+
+	return error;
 
  err_free_input:
 	input_free_device(input);
@@ -243,6 +252,7 @@ static void surface_button_remove(struct acpi_device *device)
 {
 	struct surface_button *button = acpi_driver_data(device);
 
+	acpi_device_remove_event_handler(device, ACPI_DEVICE_NOTIFY, surface_button_notify);
 	input_unregister_device(button->input);
 	kfree(button);
 }
@@ -257,7 +267,6 @@ static struct acpi_driver surface_button_driver = {
 	.ops = {
 		.add = surface_button_add,
 		.remove = surface_button_remove,
-		.notify = surface_button_notify,
 	},
 	.drv.pm = &surface_button_pm,
 };
-- 
2.40.1




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