[PATCH linux v5 16/18] drivers/fsi: Add client driver register utilities

[christopher.lee.bostic@gmail.com]

From: Chris Bostic <cbostic@us.ibm.com>

Add driver_register and driver_unregister wrappers for FSI.

V4 - Separate out SCOM client driver registration for a follow
     on patch.

V5 - Rename fsidrv_register, fsidrv_unregster to fsi_drv_register,
     fsi_drv_unregister.

   - Add module_fsi_driver() macro for clients that just need
     to do boilerplate registration

Signed-off-by: Chris Bostic <cbostic@us.ibm.com>
---
 drivers/fsi/fsi-core.c | 17 +++++++++++++++++
 include/linux/fsi.h    | 12 ++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index ed0d20f..704c473 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -456,6 +456,23 @@ static int fsi_bus_match(struct device *dev, struct device_driver *drv)
 	return 0;
 }
 
+int fsi_drv_register(struct fsi_driver *fsi_drv)
+{
+	if (!fsi_drv)
+		return -EINVAL;
+	if (!fsi_drv->id_table)
+		return -EINVAL;
+
+	return driver_register(&fsi_drv->drv);
+}
+EXPORT_SYMBOL_GPL(fsi_drv_register);
+
+void fsi_drv_unregister(struct fsi_driver *fsi_drv)
+{
+	driver_unregister(&fsi_drv->drv);
+}
+EXPORT_SYMBOL_GPL(fsi_drv_unregister);
+
 struct bus_type fsi_bus_type = {
 	.name		= "fsi",
 	.match		= fsi_bus_match,
diff --git a/include/linux/fsi.h b/include/linux/fsi.h
index 47af0af..3235dcc 100644
--- a/include/linux/fsi.h
+++ b/include/linux/fsi.h
@@ -55,6 +55,18 @@ struct fsi_driver {
 #define to_fsi_dev(devp) container_of(devp, struct fsi_device, dev)
 #define to_fsi_drv(drvp) container_of(drvp, struct fsi_driver, drv)
 
+extern int fsi_drv_register(struct fsi_driver *);
+extern void fsi_drv_unregister(struct fsi_driver *);
+
+/* module_fsi_driver() - Helper macro for drivers that don't do
+ * anything special in module init/exit.  This eliminates a lot of
+ * boilerplate.   Each module may only use this macro once, and
+ * calling it replaces module_init() and module_exit()
+ */
+#define module_fsi_driver(__fsi_driver) \
+	module_driver(__fsi_driver, fsi_drv_register, \
+			fsi_drv_unregister)
+
 extern struct bus_type fsi_bus_type;
 
 #endif /* LINUX_FSI_H */
-- 
1.8.2.2