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Diffstat (limited to 'Documentation/DocBook/media/v4l/cec-ioc-receive.xml')
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diff --git a/Documentation/DocBook/media/v4l/cec-ioc-receive.xml b/Documentation/DocBook/media/v4l/cec-ioc-receive.xml deleted file mode 100644 index fde9f8678e67..000000000000 --- a/Documentation/DocBook/media/v4l/cec-ioc-receive.xml +++ /dev/null @@ -1,274 +0,0 @@ -<refentry id="cec-ioc-receive"> - <refmeta> - <refentrytitle>ioctl CEC_RECEIVE, CEC_TRANSMIT</refentrytitle> - &manvol; - </refmeta> - - <refnamediv> - <refname>CEC_RECEIVE</refname> - <refname>CEC_TRANSMIT</refname> - <refpurpose>Receive or transmit a CEC message</refpurpose> - </refnamediv> - - <refsynopsisdiv> - <funcsynopsis> - <funcprototype> - <funcdef>int <function>ioctl</function></funcdef> - <paramdef>int <parameter>fd</parameter></paramdef> - <paramdef>int <parameter>request</parameter></paramdef> - <paramdef>struct cec_msg *<parameter>argp</parameter></paramdef> - </funcprototype> - </funcsynopsis> - </refsynopsisdiv> - - <refsect1> - <title>Arguments</title> - - <variablelist> - <varlistentry> - <term><parameter>fd</parameter></term> - <listitem> - <para>File descriptor returned by - <link linkend='cec-func-open'><function>open()</function></link>.</para> - </listitem> - </varlistentry> - <varlistentry> - <term><parameter>request</parameter></term> - <listitem> - <para>CEC_RECEIVE, CEC_TRANSMIT</para> - </listitem> - </varlistentry> - <varlistentry> - <term><parameter>argp</parameter></term> - <listitem> - <para></para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> - - <refsect1> - <title>Description</title> - - <para> - Note: this documents the proposed CEC API. This API is not yet finalized and - is currently only available as a staging kernel module. - </para> - - <para>To receive a CEC message the application has to fill in the - <structname>cec_msg</structname> structure and pass it to the - <constant>CEC_RECEIVE</constant> ioctl. <constant>CEC_RECEIVE</constant> is - only available if <constant>CEC_CAP_RECEIVE</constant> is set. If the - file descriptor is in non-blocking mode and there are no received - messages pending, then it will return -1 and set errno to the &EAGAIN;. - If the file descriptor is in blocking mode and <structfield>timeout</structfield> - is non-zero and no message arrived within <structfield>timeout</structfield> - milliseconds, then it will return -1 and set errno to the &ETIMEDOUT;.</para> - - <para>To send a CEC message the application has to fill in the - <structname>cec_msg</structname> structure and pass it to the - <constant>CEC_TRANSMIT</constant> ioctl. <constant>CEC_TRANSMIT</constant> is - only available if <constant>CEC_CAP_TRANSMIT</constant> is set. - If there is no more room in the transmit queue, then it will return - -1 and set errno to the &EBUSY;.</para> - - <table pgwide="1" frame="none" id="cec-msg"> - <title>struct <structname>cec_msg</structname></title> - <tgroup cols="3"> - &cs-str; - <tbody valign="top"> - <row> - <entry>__u64</entry> - <entry><structfield>ts</structfield></entry> - <entry>Timestamp of when the message was transmitted in ns in the case - of <constant>CEC_TRANSMIT</constant> with <structfield>reply</structfield> - set to 0, or the timestamp of the received message in all other cases.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>len</structfield></entry> - <entry>The length of the message. For <constant>CEC_TRANSMIT</constant> this - is filled in by the application. The driver will fill this in for - <constant>CEC_RECEIVE</constant> and for <constant>CEC_TRANSMIT</constant> - it will be filled in with the length of the reply message if - <structfield>reply</structfield> was set.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>timeout</structfield></entry> - <entry>The timeout in milliseconds. This is the time the device will wait for a message to - be received before timing out. If it is set to 0, then it will wait indefinitely when it - is called by <constant>CEC_RECEIVE</constant>. If it is 0 and it is called by - <constant>CEC_TRANSMIT</constant>, then it will be replaced by 1000 if the - <structfield>reply</structfield> is non-zero or ignored if <structfield>reply</structfield> - is 0.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>sequence</structfield></entry> - <entry>The sequence number is automatically assigned by the CEC - framework for all transmitted messages. It can be later used by the - framework to generate an event if a reply for a message was - requested and the message was transmitted in a non-blocking mode. - </entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>flags</structfield></entry> - <entry>Flags. No flags are defined yet, so set this to 0.</entry> - </row> - <row> - <entry>__u8</entry> - <entry><structfield>rx_status</structfield></entry> - <entry>The status bits of the received message. See <xref linkend="cec-rx-status" /> - for the possible status values. It is 0 if this message was transmitted, not - received, unless this is the reply to a transmitted message. In that case both - <structfield>rx_status</structfield> and <structfield>tx_status</structfield> - are set.</entry> - </row> - <row> - <entry>__u8</entry> - <entry><structfield>tx_status</structfield></entry> - <entry>The status bits of the transmitted message. See <xref linkend="cec-tx-status" /> - for the possible status values. It is 0 if this messages was received, not - transmitted.</entry> - </row> - <row> - <entry>__u8</entry> - <entry><structfield>msg</structfield>[16]</entry> - <entry>The message payload. For <constant>CEC_TRANSMIT</constant> this - is filled in by the application. The driver will fill this in for - <constant>CEC_RECEIVE</constant> and for <constant>CEC_TRANSMIT</constant> - it will be filled in with the payload of the reply message if - <structfield>reply</structfield> was set.</entry> - </row> - <row> - <entry>__u8</entry> - <entry><structfield>reply</structfield></entry> - <entry>Wait until this message is replied. If <structfield>reply</structfield> - is 0 and the <structfield>timeout</structfield> is 0, then don't wait for a reply but - return after transmitting the message. If there was an error as indicated by a non-zero - <structfield>tx_status</structfield> field, then <structfield>reply</structfield> and - <structfield>timeout</structfield> are both set to 0 by the driver. Ignored by - <constant>CEC_RECEIVE</constant>. The case where <structfield>reply</structfield> is 0 - (this is the opcode for the Feature Abort message) and <structfield>timeout</structfield> - is non-zero is specifically allowed to send a message and wait up to <structfield>timeout</structfield> - milliseconds for a Feature Abort reply. In this case <structfield>rx_status</structfield> - will either be set to <constant>CEC_RX_STATUS_TIMEOUT</constant> or - <constant>CEC_RX_STATUS_FEATURE_ABORT</constant>.</entry> - </row> - <row> - <entry>__u8</entry> - <entry><structfield>tx_arb_lost_cnt</structfield></entry> - <entry>A counter of the number of transmit attempts that resulted in the - Arbitration Lost error. This is only set if the hardware supports this, otherwise - it is always 0. This counter is only valid if the <constant>CEC_TX_STATUS_ARB_LOST</constant> - status bit is set.</entry> - </row> - <row> - <entry>__u8</entry> - <entry><structfield>tx_nack_cnt</structfield></entry> - <entry>A counter of the number of transmit attempts that resulted in the - Not Acknowledged error. This is only set if the hardware supports this, otherwise - it is always 0. This counter is only valid if the <constant>CEC_TX_STATUS_NACK</constant> - status bit is set.</entry> - </row> - <row> - <entry>__u8</entry> - <entry><structfield>tx_low_drive_cnt</structfield></entry> - <entry>A counter of the number of transmit attempts that resulted in the - Arbitration Lost error. This is only set if the hardware supports this, otherwise - it is always 0. This counter is only valid if the <constant>CEC_TX_STATUS_LOW_DRIVE</constant> - status bit is set.</entry> - </row> - <row> - <entry>__u8</entry> - <entry><structfield>tx_error_cnt</structfield></entry> - <entry>A counter of the number of transmit errors other than Arbitration Lost - or Not Acknowledged. This is only set if the hardware supports this, otherwise - it is always 0. This counter is only valid if the <constant>CEC_TX_STATUS_ERROR</constant> - status bit is set.</entry> - </row> - </tbody> - </tgroup> - </table> - - <table pgwide="1" frame="none" id="cec-tx-status"> - <title>CEC Transmit Status</title> - <tgroup cols="3"> - &cs-def; - <tbody valign="top"> - <row> - <entry><constant>CEC_TX_STATUS_OK</constant></entry> - <entry>0x01</entry> - <entry>The message was transmitted successfully. This is mutually exclusive with - <constant>CEC_TX_STATUS_MAX_RETRIES</constant>. Other bits can still be set if - earlier attempts met with failure before the transmit was eventually successful.</entry> - </row> - <row> - <entry><constant>CEC_TX_STATUS_ARB_LOST</constant></entry> - <entry>0x02</entry> - <entry>CEC line arbitration was lost.</entry> - </row> - <row> - <entry><constant>CEC_TX_STATUS_NACK</constant></entry> - <entry>0x04</entry> - <entry>Message was not acknowledged.</entry> - </row> - <row> - <entry><constant>CEC_TX_STATUS_LOW_DRIVE</constant></entry> - <entry>0x08</entry> - <entry>Low drive was detected on the CEC bus. This indicates that a follower - detected an error on the bus and requests a retransmission.</entry> - </row> - <row> - <entry><constant>CEC_TX_STATUS_ERROR</constant></entry> - <entry>0x10</entry> - <entry>Some error occurred. This is used for any errors that do not - fit the previous two, either because the hardware could not tell - which error occurred, or because the hardware tested for other conditions - besides those two.</entry> - </row> - <row> - <entry><constant>CEC_TX_STATUS_MAX_RETRIES</constant></entry> - <entry>0x20</entry> - <entry>The transmit failed after one or more retries. This status bit is mutually - exclusive with <constant>CEC_TX_STATUS_OK</constant>. Other bits can still be set - to explain which failures were seen.</entry> - </row> - </tbody> - </tgroup> - </table> - - <table pgwide="1" frame="none" id="cec-rx-status"> - <title>CEC Receive Status</title> - <tgroup cols="3"> - &cs-def; - <tbody valign="top"> - <row> - <entry><constant>CEC_RX_STATUS_OK</constant></entry> - <entry>0x01</entry> - <entry>The message was received successfully.</entry> - </row> - <row> - <entry><constant>CEC_RX_STATUS_TIMEOUT</constant></entry> - <entry>0x02</entry> - <entry>The reply to an earlier transmitted message timed out.</entry> - </row> - <row> - <entry><constant>CEC_RX_STATUS_FEATURE_ABORT</constant></entry> - <entry>0x04</entry> - <entry>The message was received successfully but the reply was - <constant>CEC_MSG_FEATURE_ABORT</constant>. This status is only - set if this message was the reply to an earlier transmitted - message.</entry> - </row> - </tbody> - </tgroup> - </table> - </refsect1> - - <refsect1> - &return-value; - </refsect1> -</refentry> |