[PATCH v2 7/9] media: subdev: Support privacy led in v4l2_subdev_enable/disable_streams()

[Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>]

We support camera privacy leds with the .s_stream, in call_s_stream, but
we don't have that support when the subdevice implements
.enable/disable_streams.

Add the support by enabling the led when the first stream for a
subdevice is enabled, and disabling the led then the last stream is
disabled.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index b4981447961a..015f2fb423c9 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2149,6 +2149,7 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
 {
 	struct device *dev = sd->entity.graph_obj.mdev->dev;
 	struct v4l2_subdev_state *state;
+	bool already_streaming;
 	u64 found_streams = 0;
 	unsigned int i;
 	int ret;
@@ -2197,6 +2198,11 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
 
 	dev_dbg(dev, "enable streams %u:%#llx\n", pad, streams_mask);
 
+	already_streaming = v4l2_subdev_is_streaming(sd);
+
+	if (!already_streaming)
+		v4l2_subdev_enable_privacy_led(sd);
+
 	/* Call the .enable_streams() operation. */
 	ret = v4l2_subdev_call(sd, pad, enable_streams, state, pad,
 			       streams_mask);
@@ -2216,6 +2222,9 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
 	}
 
 done:
+	if (ret && !already_streaming)
+		v4l2_subdev_disable_privacy_led(sd);
+
 	v4l2_subdev_unlock_state(state);
 
 	return ret;
@@ -2339,6 +2348,9 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
 	}
 
 done:
+	if (!v4l2_subdev_is_streaming(sd))
+		v4l2_subdev_disable_privacy_led(sd);
+
 	v4l2_subdev_unlock_state(state);
 
 	return ret;

-- 
2.34.1