[PATCH v2 11/34] iio/acpi-als: 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/iio/light/acpi-als.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/light/acpi-als.c b/drivers/iio/light/acpi-als.c
index 2d91caf24dd0..5e200c6d91bc 100644
--- a/drivers/iio/light/acpi-als.c
+++ b/drivers/iio/light/acpi-als.c
@@ -100,10 +100,14 @@ static int acpi_als_read_value(struct acpi_als *als, char *prop, s32 *val)
 	return 0;
 }
 
-static void acpi_als_notify(struct acpi_device *device, u32 event)
+static void acpi_als_notify(acpi_handle handle, u32 event, void *data)
 {
-	struct iio_dev *indio_dev = acpi_driver_data(device);
-	struct acpi_als *als = iio_priv(indio_dev);
+	struct acpi_device *device = data;
+	struct iio_dev *indio_dev;
+	struct acpi_als *als;
+
+	indio_dev = acpi_driver_data(device);
+	als = iio_priv(indio_dev);
 
 	if (iio_buffer_enabled(indio_dev) && iio_trigger_using_own(indio_dev)) {
 		switch (event) {
@@ -225,7 +229,16 @@ static int acpi_als_add(struct acpi_device *device)
 	if (ret)
 		return ret;
 
-	return devm_iio_device_register(dev, indio_dev);
+	ret = devm_iio_device_register(dev, indio_dev);
+	if (ret)
+		return ret;
+
+	return acpi_device_install_event_handler(device, ACPI_DEVICE_NOTIFY, acpi_als_notify);
+}
+
+static void acpi_als_remove(struct acpi_device *device)
+{
+	acpi_device_remove_event_handler(device, ACPI_DEVICE_NOTIFY, acpi_als_notify);
 }
 
 static const struct acpi_device_id acpi_als_device_ids[] = {
@@ -241,7 +254,7 @@ static struct acpi_driver acpi_als_driver = {
 	.ids	= acpi_als_device_ids,
 	.ops = {
 		.add	= acpi_als_add,
-		.notify	= acpi_als_notify,
+		.remove = acpi_als_remove,
 	},
 };
 
-- 
2.40.1