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Subject: media: subdev: Add checks for subdev features
Author: Tomi Valkeinen <tomi.valkei...@ideasonboard.com>
Date: Wed Apr 24 18:39:06 2024 +0300
Add some checks to verify that the subdev driver implements required
features.
A subdevice that supports streams (V4L2_SUBDEV_FL_STREAMS) must do one
of the following:
- Implement neither .enable/disable_streams() nor .s_stream(), if the
subdev is part of a video driver that uses an internal method to
enable the subdev.
- Implement only .enable/disable_streams(), if support for legacy
sink-side subdevices is not needed.
- Implement .enable/disable_streams() and .s_stream(), if support for
legacy sink-side subdevices is needed.
At the moment the framework doesn't check this requirement. Add the
check.
Reviewed-by: Umang Jain <umang.j...@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Tested-by: Umang Jain <umang.j...@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkei...@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
drivers/media/v4l2-core/v4l2-subdev.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
---
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c
b/drivers/media/v4l2-core/v4l2-subdev.c
index 56df3906eee6..09b4122d9ab7 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1588,6 +1588,33 @@ int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd,
const char *name,
struct lock_class_key *key)
{
struct v4l2_subdev_state *state;
+ struct device *dev = sd->dev;
+ bool has_disable_streams;
+ bool has_enable_streams;
+ bool has_s_stream;
+
+ /* Check that the subdevice implements the required features */
+
+ has_s_stream = v4l2_subdev_has_op(sd, video, s_stream);
+ has_enable_streams = v4l2_subdev_has_op(sd, pad, enable_streams);
+ has_disable_streams = v4l2_subdev_has_op(sd, pad, disable_streams);
+
+ if (has_enable_streams != has_disable_streams) {
+ dev_err(dev,
+ "subdev '%s' must implement both or neither of
.enable_streams() and .disable_streams()\n",
+ sd->name);
+ return -EINVAL;
+ }
+
+ if (sd->flags & V4L2_SUBDEV_FL_STREAMS) {
+ if (has_s_stream && !has_enable_streams) {
+ dev_err(dev,
+ "subdev '%s' must implement
.enable/disable_streams()\n",
+ sd->name);
+
+ return -EINVAL;
+ }
+ }
state = __v4l2_subdev_state_alloc(sd, name, key);
if (IS_ERR(state))
