diff options
Diffstat (limited to 'Documentation/media/uapi/v4l/vidioc-dbg-g-register.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/vidioc-dbg-g-register.rst | 134 |
1 files changed, 44 insertions, 90 deletions
diff --git a/Documentation/media/uapi/v4l/vidioc-dbg-g-register.rst b/Documentation/media/uapi/v4l/vidioc-dbg-g-register.rst index 09d2880e6170..5960a6547f41 100644 --- a/Documentation/media/uapi/v4l/vidioc-dbg-g-register.rst +++ b/Documentation/media/uapi/v4l/vidioc-dbg-g-register.rst @@ -15,9 +15,11 @@ VIDIOC_DBG_G_REGISTER - VIDIOC_DBG_S_REGISTER - Read or write hardware registers Synopsis ======== -.. cpp:function:: int ioctl( int fd, int request, struct v4l2_dbg_register *argp ) +.. c:function:: int ioctl( int fd, VIDIOC_DBG_G_REGISTER, struct v4l2_dbg_register *argp ) + :name: VIDIOC_DBG_G_REGISTER -.. cpp:function:: int ioctl( int fd, int request, const struct v4l2_dbg_register *argp ) +.. c:function:: int ioctl( int fd, VIDIOC_DBG_S_REGISTER, const struct v4l2_dbg_register *argp ) + :name: VIDIOC_DBG_S_REGISTER Arguments @@ -26,9 +28,6 @@ Arguments ``fd`` File descriptor returned by :ref:`open() <func-open>`. -``request`` - VIDIOC_DBG_G_REGISTER, VIDIOC_DBG_S_REGISTER - ``argp`` @@ -50,7 +49,7 @@ superuser privileges. Additionally the Linux kernel must be compiled with the ``CONFIG_VIDEO_ADV_DEBUG`` option to enable these ioctls. To write a register applications must initialize all fields of a struct -:ref:`v4l2_dbg_register <v4l2-dbg-register>` except for ``size`` and +:c:type:`v4l2_dbg_register` except for ``size`` and call ``VIDIOC_DBG_S_REGISTER`` with a pointer to this structure. The ``match.type`` and ``match.addr`` or ``match.name`` fields select a chip on the TV card, the ``reg`` field specifies a register number and the @@ -86,90 +85,55 @@ It is available from the LinuxTV v4l-dvb repository; see instructions. -.. _v4l2-dbg-match: +.. tabularcolumns:: |p{3.5cm}|p{3.5cm}|p{3.5cm}|p{7.0cm}| + +.. c:type:: v4l2_dbg_match .. flat-table:: struct v4l2_dbg_match :header-rows: 0 :stub-columns: 0 :widths: 1 1 1 2 + * - __u32 + - ``type`` + - See :ref:`chip-match-types` for a list of possible types. + * - union + - (anonymous) + * - + - __u32 + - ``addr`` + - Match a chip by this number, interpreted according to the ``type`` + field. + * - + - char + - ``name[32]`` + - Match a chip by this name, interpreted according to the ``type`` + field. Currently unused. - - .. row 1 - - - __u32 - - - ``type`` - - - See :ref:`chip-match-types` for a list of possible types. - - - .. row 2 - - - union - - - (anonymous) - - - .. row 3 - - - - - __u32 - - ``addr`` - - Match a chip by this number, interpreted according to the ``type`` - field. - - - .. row 4 - - - - - char - - - ``name[32]`` - - - Match a chip by this name, interpreted according to the ``type`` - field. Currently unused. - - - -.. _v4l2-dbg-register: +.. c:type:: v4l2_dbg_register .. flat-table:: struct v4l2_dbg_register :header-rows: 0 :stub-columns: 0 + * - struct v4l2_dbg_match + - ``match`` + - How to match the chip, see :c:type:`v4l2_dbg_match`. + * - __u32 + - ``size`` + - The register size in bytes. + * - __u64 + - ``reg`` + - A register number. + * - __u64 + - ``val`` + - The value read from, or to be written into the register. - - .. row 1 - - - struct v4l2_dbg_match - - - ``match`` - - - How to match the chip, see :ref:`v4l2-dbg-match`. - - - .. row 2 - - - __u32 - - - ``size`` - - - The register size in bytes. - - - .. row 3 - - - __u64 - - - ``reg`` - - - A register number. - - - .. row 4 - - - __u64 - - - ``val`` - - - The value read from, or to be written into the register. +.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}| .. _chip-match-types: @@ -178,23 +142,13 @@ instructions. :stub-columns: 0 :widths: 3 1 4 - - - .. row 1 - - - ``V4L2_CHIP_MATCH_BRIDGE`` - - - 0 - - - Match the nth chip on the card, zero for the bridge chip. Does not - match sub-devices. - - - .. row 2 - - - ``V4L2_CHIP_MATCH_SUBDEV`` - - - 4 - - - Match the nth sub-device. + * - ``V4L2_CHIP_MATCH_BRIDGE`` + - 0 + - Match the nth chip on the card, zero for the bridge chip. Does not + match sub-devices. + * - ``V4L2_CHIP_MATCH_SUBDEV`` + - 4 + - Match the nth sub-device. Return Value |