diff options
Diffstat (limited to 'Documentation/media/uapi/v4l/rw.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/rw.rst | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/media/uapi/v4l/rw.rst b/Documentation/media/uapi/v4l/rw.rst index 66ba54648c45..dcac379c484f 100644 --- a/Documentation/media/uapi/v4l/rw.rst +++ b/Documentation/media/uapi/v4l/rw.rst @@ -31,17 +31,17 @@ vidctrl tool is fictitious): To read from the device applications use the :ref:`read() <func-read>` function, to write the :ref:`write() <func-write>` function. Drivers must implement one I/O method if they exchange data with applications, -but it need not be this. [1]_ When reading or writing is supported, the +but it need not be this. [#f1]_ When reading or writing is supported, the driver must also support the :ref:`select() <func-select>` and -:ref:`poll() <func-poll>` function. [2]_ +:ref:`poll() <func-poll>` function. [#f2]_ -.. [1] +.. [#f1] It would be desirable if applications could depend on drivers supporting all I/O interfaces, but as much as the complex memory mapping I/O can be inadequate for some devices we have no reason to require this interface, which is most useful for simple applications capturing still images. -.. [2] +.. [#f2] At the driver level :ref:`select() <func-select>` and :ref:`poll() <func-poll>` are the same, and :ref:`select() <func-select>` is too important to be optional. |