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Subject[PATCH v16 19/20] media: v4l2-subdev: Add v4l2_subdev_s_stream_helper() function
Date
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

The v4l2_subdev_s_stream_helper() helper can be used by subdevs that
implement the stream-aware .enable_streams() and .disable_streams()
operations to implement .s_stream(). This is limited to subdevs that
have a single source pad.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
---
drivers/media/v4l2-core/v4l2-subdev.c | 40 +++++++++++++++++++++++++++
include/media/v4l2-subdev.h | 17 ++++++++++++
2 files changed, 57 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 9c5e1ac65f4f..dd3c2d86f96e 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1950,6 +1950,46 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
}
EXPORT_SYMBOL_GPL(v4l2_subdev_disable_streams);

+int v4l2_subdev_s_stream_helper(struct v4l2_subdev *sd, int enable)
+{
+ struct v4l2_subdev_state *state;
+ struct v4l2_subdev_route *route;
+ struct media_pad *pad;
+ u64 source_mask = 0;
+ int pad_index = -1;
+
+ /*
+ * Find the source pad. This helper is meant for subdevs that have a
+ * single source pad, so failures shouldn't happen, but catch them
+ * loudly nonetheless as they indicate a driver bug.
+ */
+ media_entity_for_each_pad(&sd->entity, pad) {
+ if (pad->flags & MEDIA_PAD_FL_SOURCE) {
+ pad_index = pad->index;
+ break;
+ }
+ }
+
+ if (WARN_ON(pad_index == -1))
+ return -EINVAL;
+
+ /*
+ * As there's a single source pad, just collect all the source streams.
+ */
+ state = v4l2_subdev_lock_and_get_active_state(sd);
+
+ for_each_active_route(&state->routing, route)
+ source_mask |= BIT_ULL(route->source_stream);
+
+ v4l2_subdev_unlock_state(state);
+
+ if (enable)
+ return v4l2_subdev_enable_streams(sd, pad_index, source_mask);
+ else
+ return v4l2_subdev_disable_streams(sd, pad_index, source_mask);
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_s_stream_helper);
+
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */

#endif /* CONFIG_MEDIA_CONTROLLER */
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index bff824367e0b..b21af00b1884 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1726,6 +1726,23 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask);

+/**
+ * v4l2_subdev_s_stream_helper() - Helper to implement the subdev s_stream
+ * operation using enable_streams and disable_streams
+ * @sd: The subdevice
+ * @enable: Enable or disable streaming
+ *
+ * Subdevice drivers that implement the streams-aware
+ * &v4l2_subdev_pad_ops.enable_streams and &v4l2_subdev_pad_ops.disable_streams
+ * operations can use this helper to implement the legacy
+ * &v4l2_subdev_video_ops.s_stream operation.
+ *
+ * This helper can only be used by subdevs that have a single source pad.
+ *
+ * Return: 0 on success, or a negative error code otherwise.
+ */
+int v4l2_subdev_s_stream_helper(struct v4l2_subdev *sd, int enable);
+
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */

#endif /* CONFIG_MEDIA_CONTROLLER */
--
2.34.1
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