[PATCH v4 29/35] platform/x86/wireless-hotkey: Move handler installing logic to driver

[Michal Wilczynski <michal.wilczynski@xxxxxxxxx>]

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/x86/wireless-hotkey.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/platform/x86/wireless-hotkey.c b/drivers/platform/x86/wireless-hotkey.c
index 4422863f47bb..6554ef2e9c70 100644
--- a/drivers/platform/x86/wireless-hotkey.c
+++ b/drivers/platform/x86/wireless-hotkey.c
@@ -68,9 +68,12 @@ static void wireless_input_destroy(struct acpi_device *device)
 	kfree(button);
 }
 
-static void wl_notify(struct acpi_device *acpi_dev, u32 event)
+static void wl_notify(acpi_handle handle, u32 event, void *data)
 {
-	struct wl_button *button = acpi_driver_data(acpi_dev);
+	struct acpi_device *acpi_dev = data;
+	struct wl_button *button;
+
+	button = acpi_driver_data(acpi_dev);
 
 	if (event != 0x80) {
 		pr_info("Received unknown event (0x%x)\n", event);
@@ -95,16 +98,24 @@ static int wl_add(struct acpi_device *device)
 	device->driver_data = button;
 
 	err = wireless_input_setup(device);
-	if (err) {
-		pr_err("Failed to setup wireless hotkeys\n");
-		kfree(button);
-	}
+	if (err)
+		goto fail;
 
+	err = acpi_device_install_event_handler(device, ACPI_DEVICE_NOTIFY, wl_notify);
+	if (err)
+		goto fail;
+
+	return 0;
+
+fail:
+	pr_err("Failed to setup wireless hotkeys\n");
+	kfree(button);
 	return err;
 }
 
 static void wl_remove(struct acpi_device *device)
 {
+	acpi_device_remove_event_handler(device, ACPI_DEVICE_NOTIFY, wl_notify);
 	wireless_input_destroy(device);
 }
 
@@ -115,7 +126,6 @@ static struct acpi_driver wl_driver = {
 	.ops	= {
 		.add	= wl_add,
 		.remove	= wl_remove,
-		.notify	= wl_notify,
 	},
 };
 
-- 
2.40.1