Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 143 insertions, 0 deletions

diff --git a/Documentation/media/uapi/v4l/vidioc-enum-freq-bands.rst b/Documentation/media/uapi/v4l/vidioc-enum-freq-bands.rst
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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _VIDIOC_ENUM_FREQ_BANDS:
+
+****************************
+ioctl VIDIOC_ENUM_FREQ_BANDS
+****************************
+
+Name
+====
+
+VIDIOC_ENUM_FREQ_BANDS - Enumerate supported frequency bands
+
+
+Synopsis
+========
+
+.. c:function:: int ioctl( int fd, VIDIOC_ENUM_FREQ_BANDS, struct v4l2_frequency_band *argp )
+    :name: VIDIOC_ENUM_FREQ_BANDS
+
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by :ref:`open() <func-open>`.
+
+``argp``
+    Pointer to struct :c:type:`v4l2_frequency_band`.
+
+
+Description
+===========
+
+Enumerates the frequency bands that a tuner or modulator supports. To do
+this applications initialize the ``tuner``, ``type`` and ``index``
+fields, and zero out the ``reserved`` array of a struct
+:c:type:`v4l2_frequency_band` and call the
+:ref:`VIDIOC_ENUM_FREQ_BANDS` ioctl with a pointer to this structure.
+
+This ioctl is supported if the ``V4L2_TUNER_CAP_FREQ_BANDS`` capability
+of the corresponding tuner/modulator is set.
+
+
+.. tabularcolumns:: |p{2.9cm}|p{2.9cm}|p{5.8cm}|p{2.9cm}|p{3.0cm}|
+
+.. c:type:: v4l2_frequency_band
+
+.. flat-table:: struct v4l2_frequency_band
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2 1 1
+
+    * - __u32
+      - ``tuner``
+      - The tuner or modulator index number. This is the same value as in
+	the struct :c:type:`v4l2_input` ``tuner`` field and
+	the struct :c:type:`v4l2_tuner` ``index`` field, or
+	the struct :c:type:`v4l2_output` ``modulator`` field
+	and the struct :c:type:`v4l2_modulator` ``index``
+	field.
+    * - __u32
+      - ``type``
+      - The tuner type. This is the same value as in the struct
+	:c:type:`v4l2_tuner` ``type`` field. The type must be
+	set to ``V4L2_TUNER_RADIO`` for ``/dev/radioX`` device nodes, and
+	to ``V4L2_TUNER_ANALOG_TV`` for all others. Set this field to
+	``V4L2_TUNER_RADIO`` for modulators (currently only radio
+	modulators are supported). See :c:type:`v4l2_tuner_type`
+    * - __u32
+      - ``index``
+      - Identifies the frequency band, set by the application.
+    * - __u32
+      - ``capability``
+      - :cspan:`2` The tuner/modulator capability flags for this
+	frequency band, see :ref:`tuner-capability`. The
+	``V4L2_TUNER_CAP_LOW`` or ``V4L2_TUNER_CAP_1HZ`` capability must
+	be the same for all frequency bands of the selected
+	tuner/modulator. So either all bands have that capability set, or
+	none of them have that capability.
+    * - __u32
+      - ``rangelow``
+      - :cspan:`2` The lowest tunable frequency in units of 62.5 kHz, or
+	if the ``capability`` flag ``V4L2_TUNER_CAP_LOW`` is set, in units
+	of 62.5 Hz, for this frequency band. A 1 Hz unit is used when the
+	``capability`` flag ``V4L2_TUNER_CAP_1HZ`` is set.
+    * - __u32
+      - ``rangehigh``
+      - :cspan:`2` The highest tunable frequency in units of 62.5 kHz,
+	or if the ``capability`` flag ``V4L2_TUNER_CAP_LOW`` is set, in
+	units of 62.5 Hz, for this frequency band. A 1 Hz unit is used
+	when the ``capability`` flag ``V4L2_TUNER_CAP_1HZ`` is set.
+    * - __u32
+      - ``modulation``
+      - :cspan:`2` The supported modulation systems of this frequency
+	band. See :ref:`band-modulation`.
+
+	.. note::
+
+	   Currently only one modulation system per frequency band
+	   is supported. More work will need to be done if multiple
+	   modulation systems are possible. Contact the linux-media
+	   mailing list
+	   (`https://linuxtv.org/lists.php <https://linuxtv.org/lists.php>`__)
+	   if you need such functionality.
+    * - __u32
+      - ``reserved``\ [9]
+      - Reserved for future extensions.
+
+	Applications and drivers must set the array to zero.
+
+
+
+.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
+
+.. _band-modulation:
+
+.. flat-table:: Band Modulation Systems
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       3 1 4
+
+    * - ``V4L2_BAND_MODULATION_VSB``
+      - 0x02
+      - Vestigial Sideband modulation, used for analog TV.
+    * - ``V4L2_BAND_MODULATION_FM``
+      - 0x04
+      - Frequency Modulation, commonly used for analog radio.
+    * - ``V4L2_BAND_MODULATION_AM``
+      - 0x08
+      - Amplitude Modulation, commonly used for analog radio.
+
+
+Return Value
+============
+
+On success 0 is returned, on error -1 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.
+
+EINVAL
+    The ``tuner`` or ``index`` is out of bounds or the ``type`` field is
+    wrong.