linux-kernel - [PATCH v4 07/10] media: subdev: Support privacy led in v4l2_subdev_enable/disable

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Message-Id: <20240416-enable-streams-impro-v4-7-1d370c9c2b6d@ideasonboard.com>
Date: Tue, 16 Apr 2024 13:40:06 +0300
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Hans Verkuil <hverkuil@...all.nl>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Umang Jain <umang.jain@...asonboard.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH v4 07/10] media: subdev: Support privacy led in
 v4l2_subdev_enable/disable_streams()

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

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.

Reviewed-by: Umang Jain <umang.jain@...asonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 06f87b15dadb..38388b223564 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2150,6 +2150,7 @@ 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;
@@ -2198,6 +2199,8 @@ 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);
+
 	/* Call the .enable_streams() operation. */
 	ret = v4l2_subdev_call(sd, pad, enable_streams, state, pad,
 			       streams_mask);
@@ -2216,6 +2219,9 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
 			cfg->enabled = true;
 	}
 
+	if (!already_streaming)
+		v4l2_subdev_enable_privacy_led(sd);
+
 done:
 	v4l2_subdev_unlock_state(state);
 
@@ -2340,6 +2346,9 @@ 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