Allow access serdev controllers by other drivers in a safe way.
Cc: Rob Herring <r...@kernel.org>
Cc: Johan Hovold <jo...@kernel.org>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Jiri Slaby <jsl...@suse.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.riba...@gmail.com>
---
drivers/tty/serdev/core.c | 23 +++++++++++++++++++++++
include/linux/serdev.h | 2 ++
2 files changed, 25 insertions(+)
diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index 6b24b0a74fbf..06310110104a 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -724,6 +724,29 @@ void serdev_controller_remove(struct serdev_controller
*ctrl)
}
EXPORT_SYMBOL_GPL(serdev_controller_remove);
+struct serdev_controller *serdev_get_controller(int nr)
+{
+ struct serdev_controller *ctrl;
+
+ ctrl = idr_find(&ctrl_idr, nr);
+ if (!ctrl)
+ return NULL;
+
+ get_device(&ctrl->dev);
+
+ return ctrl;
+}
+EXPORT_SYMBOL_GPL(serdev_get_controller);
+
+void serdev_put_controller(struct serdev_controller *ctrl)
+{
+ if (!ctrl)
+ return;
+
+ put_device(&ctrl->dev);
+}
+EXPORT_SYMBOL_GPL(serdev_put_controller);
+
/**
* serdev_driver_register() - Register client driver with serdev core
* @sdrv: client driver to be associated with client-device.
diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index bf282b3781b9..1ef6e6503650 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -182,6 +182,8 @@ void serdev_device_remove(struct serdev_device *);
struct serdev_controller *serdev_controller_alloc(struct device *, size_t);
int serdev_controller_add(struct serdev_controller *);
void serdev_controller_remove(struct serdev_controller *);
+void serdev_put_controller(struct serdev_controller *ctrl);
+struct serdev_controller *serdev_get_controller(int nr);
static inline void serdev_controller_write_wakeup(struct serdev_controller
*ctrl)
{
--
2.17.1
