diff options
Diffstat (limited to 'Documentation/driver-api/media/v4l2-fh.rst')
| -rw-r--r-- | Documentation/driver-api/media/v4l2-fh.rst | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/Documentation/driver-api/media/v4l2-fh.rst b/Documentation/driver-api/media/v4l2-fh.rst index 4c62b19af744..3eeaa8da0c9e 100644 --- a/Documentation/driver-api/media/v4l2-fh.rst +++ b/Documentation/driver-api/media/v4l2-fh.rst @@ -3,11 +3,11 @@ V4L2 File handlers ------------------ -struct :c:type:`v4l2_fh` provides a way to easily keep file handle specific +struct v4l2_fh provides a way to easily keep file handle specific data that is used by the V4L2 framework. .. attention:: - New drivers must use struct :c:type:`v4l2_fh` + New drivers must use struct v4l2_fh since it is also used to implement priority handling (:ref:`VIDIOC_G_PRIORITY`). @@ -16,11 +16,11 @@ whether a driver uses :c:type:`v4l2_fh` as its ``file->private_data`` pointer by testing the ``V4L2_FL_USES_V4L2_FH`` bit in :c:type:`video_device`->flags. This bit is set whenever :c:func:`v4l2_fh_init` is called. -struct :c:type:`v4l2_fh` is allocated as a part of the driver's own file handle +struct v4l2_fh is allocated as a part of the driver's own file handle structure and ``file->private_data`` is set to it in the driver's ``open()`` function by the driver. -In many cases the struct :c:type:`v4l2_fh` will be embedded in a larger +In many cases the struct v4l2_fh will be embedded in a larger structure. In that case you should call: #) :c:func:`v4l2_fh_init` and :c:func:`v4l2_fh_add` in ``open()`` @@ -102,18 +102,18 @@ Below is a short description of the :c:type:`v4l2_fh` functions used: memory can be freed. -If struct :c:type:`v4l2_fh` is not embedded, then you can use these helper functions: +If struct v4l2_fh is not embedded, then you can use these helper functions: :c:func:`v4l2_fh_open <v4l2_fh_open>` (struct file \*filp) -- This allocates a struct :c:type:`v4l2_fh`, initializes it and adds it to - the struct :c:type:`video_device` associated with the file struct. +- This allocates a struct v4l2_fh, initializes it and adds it to + the struct video_device associated with the file struct. :c:func:`v4l2_fh_release <v4l2_fh_release>` (struct file \*filp) -- This deletes it from the struct :c:type:`video_device` associated with the +- This deletes it from the struct video_device associated with the file struct, uninitialised the :c:type:`v4l2_fh` and frees it. These two functions can be plugged into the v4l2_file_operation's ``open()`` |