<entry>The ioctl can't be handled because the device is busy. This is
typically return while device is streaming, and an ioctl tried to
change something that would affect the stream, or would require the
- usage of a hardware resource that was already allocated.</entry>
+ usage of a hardware resource that was already allocated. The ioctl
+ must not be retried without performing another action to fix the
+ problem first (typically: stop the stream before retrying).</entry>
+ </row>
+ <row>
+ <entry>EINVAL</entry>
+ <entry>The ioctl is not supported by the driver, actually meaning that
+ the required functionality is not available.</entry>
+ </row>
+ <row>
+ <entry>ENOMEM</entry>
+ <entry>There's not enough memory to handle the desired operation.</entry>
+ </row>
+ <row>
+ <entry>ENOSPC</entry>
+ <entry>On USB devices, the stream ioctl's can return this error meaning
+ that this request would overcommit the usb bandwidth reserved
+ for periodic transfers (up to 80% of the USB bandwidth).</entry>
</row>
</tbody>
</tgroup>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
<para>The &v4l2-cropcap; <structfield>type</structfield> is
-invalid or the ioctl is not supported. This is not permitted for
-video capture, output and overlay devices, which must support
-<constant>VIDIOC_CROPCAP</constant>.</para>
+invalid. This is not permitted for video capture, output and overlay devices,
+which must support <constant>VIDIOC_CROPCAP</constant>.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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--->
<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>The driver does not support this ioctl, or the
-<structfield>match_type</structfield> is invalid.</para>
+ <para>The <structfield>match_type</structfield> is invalid.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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--->
<variablelist>
<varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>The driver does not support this ioctl, or the kernel
-was not compiled with the <constant>CONFIG_VIDEO_ADV_DEBUG</constant>
-option, or the <structfield>match_type</structfield> is invalid, or the
-selected chip or register does not exist.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
<term><errorcode>EPERM</errorcode></term>
<listitem>
<para>Insufficient permissions. Root privileges are required
</variablelist>
</refsect1>
</refentry>
-
-<!--
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</table>
</refsect1>
+ <refsect1>
+ &return-value;
+ </refsect1>
</refentry>
-<!--
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--->
<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>The driver does not support this ioctl, or the
-<structfield>cmd</structfield> field is invalid.</para>
+ <para>The <structfield>cmd</structfield> field is invalid.</para>
</listitem>
</varlistentry>
<varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<refsect1>
&return-value;
-
- <para>See the description section above for a list of return
-values that <varname>errno</varname> can have.</para>
</refsect1>
</refentry>
-
-<!--
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<refsect1>
&return-value;
-
- <para>See the description section above for a list of return
-values that <varname>errno</varname> can have.</para>
</refsect1>
</refentry>
-
-<!--
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<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>The number of the audio input is out of bounds, or
-there are no audio inputs at all and this ioctl is not
-supported.</para>
+ <para>The number of the audio input is out of bounds.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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--->
<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>The number of the audio output is out of bounds, or
-there are no audio outputs at all and this ioctl is not
-supported.</para>
+ <para>The number of the audio output is out of bounds.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<listitem>
<para>No audio inputs combine with the current video input,
or the number of the selected audio input is out of bounds or it does
-not combine, or there are no audio inputs at all and the ioctl is not
-supported.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>I/O is in progress, the input cannot be
-switched.</para>
+not combine.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<listitem>
<para>No audio outputs combine with the current video
output, or the number of the selected audio output is out of bounds or
-it does not combine, or there are no audio outputs at all and the
-ioctl is not supported.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>I/O is in progress, the output cannot be
-switched.</para>
+it does not combine.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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--->
<refsect1>
&return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>Cropping is not supported.</para>
- </listitem>
- </varlistentry>
- </variablelist>
</refsect1>
</refentry>
-
-<!--
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</tbody>
</tgroup>
</table>
-
+ </refsect1>
+ <refsect1>
+ &return-value;
</refsect1>
</refentry>
-
-<!--
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</tgroup>
</table>
</refsect1>
+ <refsect1>
+ &return-value;
+ </refsect1>
</refentry>
-
-<!--
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-indent-tabs-mode: nil
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<refsect1>
&return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>The driver does not support this ioctl.</para>
- </listitem>
- </varlistentry>
- </variablelist>
</refsect1>
</refentry>
-
-<!--
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--->
</listitem>
</varlistentry>
<varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>The framebuffer parameters cannot be changed at this
-time because overlay is already enabled, or capturing is enabled
-and the hardware cannot capture and overlay simultaneously.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>The ioctl is not supported or the
-<constant>VIDIOC_S_FBUF</constant> parameters are unsuitable.</para>
+ <para>The <constant>VIDIOC_S_FBUF</constant> parameters are unsuitable.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<variablelist>
<varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>The data format cannot be changed at this
-time, for example because I/O is already in progress.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
<para>The &v4l2-format; <structfield>type</structfield>
-field is invalid, the requested buffer type not supported, or
-<constant>VIDIOC_TRY_FMT</constant> was called and is not
-supported with this buffer type.</para>
+field is invalid, the requested buffer type not supported, or the
+format is not supported with this buffer type.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>The number of the video input is out of bounds, or
-there are no video inputs at all and this ioctl is not
-supported.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>I/O is in progress, the input cannot be
-switched.</para>
+ <para>The number of the video input is out of bounds.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<refsect1>
&return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>This ioctl is not supported.</para>
- </listitem>
- </varlistentry>
- </variablelist>
</refsect1>
</refentry>
-
-<!--
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<term><errorcode>EINVAL</errorcode></term>
<listitem>
<para>The number of the video output is out of bounds, or
-there are no video outputs at all and this ioctl is not
-supported.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>I/O is in progress, the output cannot be
-switched.</para>
+there are no video outputs at all.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<refsect1>
&return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>This ioctl is not supported.</para>
- </listitem>
- </varlistentry>
- </variablelist>
</refsect1>
</refentry>
-
-<!--
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<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>The requested priority value is invalid, or the
-driver does not support access priorities.</para>
+ <para>The requested priority value is invalid.</para>
</listitem>
</varlistentry>
<varlistentry>
<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>The device does not support sliced VBI capturing or
-output, or the value in the <structfield>type</structfield> field is
+ <para>The value in the <structfield>type</structfield> field is
wrong.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>This ioctl is not supported, or the
-<constant>VIDIOC_S_STD</constant> parameter was unsuitable.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>The device is busy and therefore can not change the standard</para>
+ <para>The <constant>VIDIOC_S_STD</constant> parameter was unsuitable.</para>
</listitem>
</varlistentry>
</variablelist>
<refsect1>
&return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>The driver does not support this ioctl.</para>
- </listitem>
- </varlistentry>
- </variablelist>
</refsect1>
</refentry>
-
-<!--
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<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>Video overlay is not supported, or the
-parameters have not been set up. See <xref
+ <para>The overlay parameters have not been set up. See <xref
linkend="overlay" /> for the necessary steps.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<structfield>userptr</structfield> or
<structfield>length</structfield> are invalid.</para>
</listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>ENOMEM</errorcode></term>
- <listitem>
- <para>Not enough physical or virtual memory was available to
-enqueue a user pointer buffer.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
<term><errorcode>EIO</errorcode></term>
<listitem>
<para><constant>VIDIOC_DQBUF</constant> failed due to an
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<refsect1>
&return-value;
- <variablelist>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>This ioctl is not supported.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>The device is busy and therefore can not sense the preset</para>
- </listitem>
- </varlistentry>
- </variablelist>
</refsect1>
</refentry>
-
-<!--
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<refsect1>
&return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>The device is not compatible with this
-specification.</para>
- </listitem>
- </varlistentry>
- </variablelist>
</refsect1>
</refentry>
-
-<!--
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-
<refsect1>
&return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>This ioctl is not supported.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>The device is busy and therefore can not detect the standard</para>
- </listitem>
- </varlistentry>
- </variablelist>
</refsect1>
</refentry>
-
-<!--
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<variablelist>
<varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>The driver supports multiple opens and I/O is already
-in progress, or reallocation of buffers was attempted although one or
-more are still mapped.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
<para>The buffer type (<structfield>type</structfield> field) or the
</variablelist>
</refsect1>
</refentry>
-
-<!--
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<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
- <para>Streaming I/O is not supported, the buffer
-<structfield>type</structfield> is not supported, or no buffers have
-been allocated (memory mapping) or enqueued (output) yet.</para>
+ <para>The buffer<structfield>type</structfield> is not supported,
+ or no buffers have been allocated (memory mapping) or enqueued
+ (output) yet.</para>
</listitem>
</varlistentry>
<varlistentry>
</variablelist>
</refsect1>
</refentry>
-
-<!--
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</varlistentry>
</variablelist>
</refsect1>
+ <refsect1>
+ &return-value;
+ </refsect1>
</refentry>
</tbody>
</tgroup>
</table>
-
+ </refsect1>
+ <refsect1>
+ &return-value;
</refsect1>
</refentry>
-<!--
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