[PATCH v6 1/9] acpi/bus: Introduce wrappers for ACPICA event handler install/remove

[Michal Wilczynski <michal.wilczynski@intel.com>]

Introduce new acpi_dev_install_notify_handler() and
acpi_dev_remove_notify_handler(). Those functions are replacing old
installers, and after all drivers switch to the new model, old installers
will be removed.

Make acpi_dev_install_notify_handler() and acpi_dev_remove_notify_handler()
non-static, and export symbols. This will allow the drivers to call them
directly, instead of relying on .notify callback.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
---
 drivers/acpi/bus.c      | 26 ++++++++++++++++++++++++++
 include/acpi/acpi_bus.h |  6 ++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 20cdfb37da79..2d6f1f45d44e 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -554,6 +554,32 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device,
 	acpi_os_wait_events_complete();
 }
 
+int acpi_dev_install_notify_handler(struct acpi_device *adev,
+				    u32 handler_type,
+				    acpi_notify_handler handler)
+{
+	acpi_status status;
+
+	status = acpi_install_notify_handler(adev->handle,
+					     handler_type,
+					     handler,
+					     adev);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	return 0;
+}
+EXPORT_SYMBOL(acpi_dev_install_notify_handler);
+
+void acpi_dev_remove_notify_handler(struct acpi_device *adev,
+				    u32 handler_type,
+				    acpi_notify_handler handler)
+{
+	acpi_remove_notify_handler(adev->handle, handler_type, handler);
+	acpi_os_wait_events_complete();
+}
+EXPORT_SYMBOL(acpi_dev_remove_notify_handler);
+
 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 
 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index c941d99162c0..23fbe4a16972 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -515,6 +515,12 @@ void acpi_bus_private_data_handler(acpi_handle, void *);
 int acpi_bus_get_private_data(acpi_handle, void **);
 int acpi_bus_attach_private_data(acpi_handle, void *);
 void acpi_bus_detach_private_data(acpi_handle);
+int acpi_dev_install_notify_handler(struct acpi_device *adev,
+				    u32 handler_type,
+				    acpi_notify_handler handler);
+void acpi_dev_remove_notify_handler(struct acpi_device *adev,
+				    u32 handler_type,
+				    acpi_notify_handler handler);
 extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
 extern int register_acpi_notifier(struct notifier_block *);
 extern int unregister_acpi_notifier(struct notifier_block *);
-- 
2.41.0