[PATCH v1 2/3] hwmon: (acpi_power_meter) Register ACPI notify handler directly

["Rafael J. Wysocki" <rafael@kernel.org>]

From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

To facilitate subsequent conversion of the driver to a platform one,
make it install an ACPI notify handler directly instead of using
a .notify() callback in struct acpi_driver.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/hwmon/acpi_power_meter.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
index 49e57c20ef70..c010f55f7c7b 100644
--- a/drivers/hwmon/acpi_power_meter.c
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -814,8 +814,9 @@ static int read_capabilities(struct acpi_power_meter_resource *resource)
 }
 
 /* Handle ACPI event notifications */
-static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
+static void acpi_power_meter_notify(acpi_handle handle, u32 event, void *data)
 {
+	struct acpi_device *device = data;
 	struct acpi_power_meter_resource *resource = acpi_driver_data(device);
 	int res;
 
@@ -936,9 +937,16 @@ static int acpi_power_meter_add(struct acpi_device *device)
 		goto exit_remove;
 	}
 
+	res = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
+					      acpi_power_meter_notify, device);
+	if (res)
+		goto exit_hwmon;
+
 	res = 0;
 	goto exit;
 
+exit_hwmon:
+	hwmon_device_unregister(resource->hwmon_dev);
 exit_remove:
 	remove_domain_devices(resource);
 exit_free_capability:
@@ -953,6 +961,9 @@ static void acpi_power_meter_remove(struct acpi_device *device)
 {
 	struct acpi_power_meter_resource *resource = acpi_driver_data(device);
 
+	acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
+				       acpi_power_meter_notify);
+
 	if (!IS_ERR(resource->hwmon_dev))
 		hwmon_device_unregister(resource->hwmon_dev);
 
@@ -984,7 +995,6 @@ static struct acpi_driver acpi_power_meter_driver = {
 	.ops = {
 		.add = acpi_power_meter_add,
 		.remove = acpi_power_meter_remove,
-		.notify = acpi_power_meter_notify,
 		},
 	.drv.pm = pm_sleep_ptr(&acpi_power_meter_pm),
 };
-- 
2.51.0