0004-tty-serdev-support-shutdown-op.patch

From 9ef294895cf135238269e12457f104a42397b59b Mon Sep 17 00:00:00 2001
From: Tobias Schramm <t.schramm@manjaro.org>
Date: Thu, 28 May 2020 14:12:56 +0200
Subject: [PATCH 04/26] tty: serdev: support shutdown op

Allow serdev drivers to register a shutdown handler

Signed-off-by: Tobias Schramm <t.schramm@manjaro.org>
---
 drivers/tty/serdev/core.c | 11 +++++++++++
 include/linux/serdev.h    |  1 +
 2 files changed, 12 insertions(+)

diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index c5f0d936b003..37e45c356540 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -432,11 +432,22 @@ static int serdev_drv_remove(struct device *dev)
 	return 0;
 }
 
+static void serdev_drv_shutdown(struct device *dev)
+{
+	const struct serdev_device_driver *sdrv;
+	if (dev->driver) {
+		sdrv = to_serdev_device_driver(dev->driver);
+		if (sdrv->shutdown)
+			sdrv->shutdown(to_serdev_device(dev));
+	}
+}
+
 static struct bus_type serdev_bus_type = {
 	.name		= "serial",
 	.match		= serdev_device_match,
 	.probe		= serdev_drv_probe,
 	.remove		= serdev_drv_remove,
+	.shutdown	= serdev_drv_shutdown,
 };
 
 /**
diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index 9f14f9c12ec4..94050561325c 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -63,6 +63,7 @@ struct serdev_device_driver {
 	struct device_driver driver;
 	int	(*probe)(struct serdev_device *);
 	void	(*remove)(struct serdev_device *);
+	void	(*shutdown)(struct serdev_device *);
 };
 
 static inline struct serdev_device_driver *to_serdev_device_driver(struct device_driver *d)
-- 
2.28.0