media: mt9m111: add s_stream callback

This change “media: mt9m111: add s_stream callback” in Linux kernel is authored by Marco Felsch <m.felsch [at] pengutronix.de> on Tue Nov 27 05:02:48 2018 -0500.

media: mt9m111: add s_stream callback

Add callback to check if we are already streaming. Now other callbacks
can check the state and return -EBUSY if we already streaming.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

This Linux change may have been applied to various maintained Linux releases and you can find Linux releases including commit 7784b1d.

There are 10 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 drivers/media/i2c/mt9m111.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/media/i2c/mt9m111.c b/drivers/media/i2c/mt9m111.c
index 58d134d..0355966 100644
--- a/drivers/media/i2c/mt9m111.c
+++ b/drivers/media/i2c/mt9m111.c
@@ -220,6 +220,7 @@ struct mt9m111 {
 	int power_count;
 	const struct mt9m111_datafmt *fmt;
 	int lastpage;	/* PageMap cache value */
+	bool is_streaming;
 #ifdef CONFIG_MEDIA_CONTROLLER
 	struct media_pad pad;
 #endif
@@ -910,6 +911,14 @@ static int mt9m111_enum_mbus_code(struct v4l2_subdev *sd,
 	return 0;
 }
 
+static int mt9m111_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct mt9m111 *mt9m111 = container_of(sd, struct mt9m111, subdev);
+
+	mt9m111->is_streaming = !!enable;
+	return 0;
+}
+
 static int mt9m111_g_mbus_config(struct v4l2_subdev *sd,
 				struct v4l2_mbus_config *cfg)
 {
@@ -923,6 +932,7 @@ static int mt9m111_g_mbus_config(struct v4l2_subdev *sd,
 
 static const struct v4l2_subdev_video_ops mt9m111_subdev_video_ops = {
 	.g_mbus_config	= mt9m111_g_mbus_config,
+	.s_stream	= mt9m111_s_stream,
 };
 
 static const struct v4l2_subdev_pad_ops mt9m111_subdev_pad_ops = {

The commit for this change in Linux stable tree is 7784b1d (patch).

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