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| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2024-08-28 16:24:07 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2024-10-12 10:44:05 +0200 |
| commit | ccb32f2357c08f64947e0fc32f9a9551ae69c6b3 (patch) | |
| tree | 54557e9c60e8591ba4a5f594cf50a99dc9579d3d | |
| parent | bfe703ac0c9f42fd54ec46416146f46d9502bc8c (diff) | |
| download | lwn-ccb32f2357c08f64947e0fc32f9a9551ae69c6b3.tar.gz lwn-ccb32f2357c08f64947e0fc32f9a9551ae69c6b3.zip | |
media: v4l2-core: add v4l2_debugfs_root()
This new function returns the dentry of the top-level debugfs "v4l2"
directory. If it does not exist yet, then it is created first.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-dev.c | 14 | ||||
| -rw-r--r-- | include/media/v4l2-dev.h | 15 |
2 files changed, 29 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c index 3d7711cc42bc..dbd6fba93179 100644 --- a/drivers/media/v4l2-core/v4l2-dev.c +++ b/drivers/media/v4l2-core/v4l2-dev.c @@ -93,6 +93,8 @@ static struct attribute *video_device_attrs[] = { }; ATTRIBUTE_GROUPS(video_device); +static struct dentry *v4l2_debugfs_root_dir; + /* * Active devices */ @@ -1118,6 +1120,16 @@ void video_unregister_device(struct video_device *vdev) } EXPORT_SYMBOL(video_unregister_device); +#ifdef CONFIG_DEBUG_FS +struct dentry *v4l2_debugfs_root(void) +{ + if (!v4l2_debugfs_root_dir) + v4l2_debugfs_root_dir = debugfs_create_dir("v4l2", NULL); + return v4l2_debugfs_root_dir; +} +EXPORT_SYMBOL_GPL(v4l2_debugfs_root); +#endif + #if defined(CONFIG_MEDIA_CONTROLLER) __must_check int video_device_pipeline_start(struct video_device *vdev, @@ -1222,6 +1234,8 @@ static void __exit videodev_exit(void) class_unregister(&video_class); unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); + debugfs_remove_recursive(v4l2_debugfs_root_dir); + v4l2_debugfs_root_dir = NULL; } subsys_initcall(videodev_init); diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h index d82dfdbf6e58..1b6222fab24e 100644 --- a/include/media/v4l2-dev.h +++ b/include/media/v4l2-dev.h @@ -62,6 +62,7 @@ struct v4l2_ioctl_callbacks; struct video_device; struct v4l2_device; struct v4l2_ctrl_handler; +struct dentry; /** * enum v4l2_video_device_flags - Flags used by &struct video_device @@ -539,6 +540,20 @@ static inline int video_is_registered(struct video_device *vdev) return test_bit(V4L2_FL_REGISTERED, &vdev->flags); } +/** + * v4l2_debugfs_root - returns the dentry of the top-level "v4l2" debugfs dir + * + * If this directory does not yet exist, then it will be created. + */ +#ifdef CONFIG_DEBUG_FS +struct dentry *v4l2_debugfs_root(void); +#else +static inline struct dentry *v4l2_debugfs_root(void) +{ + return NULL; +} +#endif + #if defined(CONFIG_MEDIA_CONTROLLER) /** |