tee: Add some helpers to reduce boilerplate for tee client drivers

Similar to platform drivers (and others) create dedicated register and
unregister functions and a macro to simplify modules that only need to
handle driver registration in their init and exit handlers.

Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

Author: ukleinek

drivers/tee/tee_core.c

@@ -1405,6 +1405,22 @@ const struct bus_type tee_bus_type = {
 };
 EXPORT_SYMBOL_GPL(tee_bus_type);
 
+int __tee_client_driver_register(struct tee_client_driver *tee_driver,
+				 struct module *owner)
+{
+	tee_driver->driver.owner = owner;
+	tee_driver->driver.bus = &tee_bus_type;
+
+	return driver_register(&tee_driver->driver);
+}
+EXPORT_SYMBOL_GPL(__tee_client_driver_register);
+
+void tee_client_driver_unregister(struct tee_client_driver *tee_driver)
+{
+	driver_unregister(&tee_driver->driver);
+}
+EXPORT_SYMBOL_GPL(tee_client_driver_unregister);
+
 static int __init tee_init(void)
 {
 	int rc;

include/linux/tee_drv.h

@@ -322,4 +322,13 @@ struct tee_client_driver {
 #define to_tee_client_driver(d) \
 		container_of_const(d, struct tee_client_driver, driver)
 
+#define tee_client_driver_register(drv) \
+        __tee_client_driver_register(drv, THIS_MODULE)
+int __tee_client_driver_register(struct tee_client_driver *, struct module *);
+void tee_client_driver_unregister(struct tee_client_driver *);
+
+#define module_tee_client_driver(__tee_client_driver) \
+	module_driver(__tee_client_driver, tee_client_driver_register, \
+		      tee_client_driver_unregister)
+
 #endif /*__TEE_DRV_H*/