diff options
Diffstat (limited to 'Documentation/DocBook/media')
| -rw-r--r-- | Documentation/DocBook/media/Makefile | 2 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/biblio.xml | 10 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-api.xml | 75 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-func-close.xml | 64 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-func-ioctl.xml | 78 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-func-open.xml | 104 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-func-poll.xml | 94 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-ioc-adap-g-caps.xml | 151 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-ioc-adap-g-log-addrs.xml | 329 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-ioc-adap-g-phys-addr.xml | 86 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-ioc-dqevent.xml | 202 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-ioc-g-mode.xml | 255 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/cec-ioc-receive.xml | 274 |
13 files changed, 1724 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/Makefile b/Documentation/DocBook/media/Makefile index 2840ff483d5a..fdc138624800 100644 --- a/Documentation/DocBook/media/Makefile +++ b/Documentation/DocBook/media/Makefile @@ -64,6 +64,7 @@ IOCTLS = \ $(shell perl -ne 'print "$$1 " if /\#define\s+([A-Z][^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/dvb/net.h) \ $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/dvb/video.h) \ $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/media.h) \ + $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/linux/cec.h) \ $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/v4l2-subdev.h) \ DEFINES = \ @@ -100,6 +101,7 @@ STRUCTS = \ $(shell perl -ne 'print "$$1 " if (/^struct\s+([^\s]+)\s+/ && !/_old/)' $(srctree)/include/uapi/linux/dvb/net.h) \ $(shell perl -ne 'print "$$1 " if (/^struct\s+([^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/video.h) \ $(shell perl -ne 'print "$$1 " if /^struct\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/media.h) \ + $(shell perl -ne 'print "$$1 " if /^struct\s+([^\s]+)\s+/' $(srctree)/include/linux/cec.h) \ $(shell perl -ne 'print "$$1 " if /^struct\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/v4l2-subdev.h) \ $(shell perl -ne 'print "$$1 " if /^struct\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/v4l2-mediabus.h) diff --git a/Documentation/DocBook/media/v4l/biblio.xml b/Documentation/DocBook/media/v4l/biblio.xml index 9beb30f0071b..87f1d24958aa 100644 --- a/Documentation/DocBook/media/v4l/biblio.xml +++ b/Documentation/DocBook/media/v4l/biblio.xml @@ -342,6 +342,16 @@ in the frequency range from 87,5 to 108,0 MHz</title> <subtitle>Specification Version 1.4a</subtitle> </biblioentry> + <biblioentry id="hdmi2"> + <abbrev>HDMI2</abbrev> + <authorgroup> + <corpauthor>HDMI Licensing LLC +(<ulink url="http://www.hdmi.org">http://www.hdmi.org</ulink>)</corpauthor> + </authorgroup> + <title>High-Definition Multimedia Interface</title> + <subtitle>Specification Version 2.0</subtitle> + </biblioentry> + <biblioentry id="dp"> <abbrev>DP</abbrev> <authorgroup> diff --git a/Documentation/DocBook/media/v4l/cec-api.xml b/Documentation/DocBook/media/v4l/cec-api.xml new file mode 100644 index 000000000000..7062c1fa4904 --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-api.xml @@ -0,0 +1,75 @@ +<partinfo> + <authorgroup> + <author> + <firstname>Hans</firstname> + <surname>Verkuil</surname> + <affiliation><address><email>hans.verkuil@cisco.com</email></address></affiliation> + <contrib>Initial version.</contrib> + </author> + </authorgroup> + <copyright> + <year>2016</year> + <holder>Hans Verkuil</holder> + </copyright> + + <revhistory> + <!-- Put document revisions here, newest first. --> + <revision> + <revnumber>1.0.0</revnumber> + <date>2016-03-17</date> + <authorinitials>hv</authorinitials> + <revremark>Initial revision</revremark> + </revision> + </revhistory> +</partinfo> + +<title>CEC API</title> + +<chapter id="cec-api"> + <title>CEC: Consumer Electronics Control</title> + + <section id="cec-intro"> + <title>Introduction</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>HDMI connectors provide a single pin for use by the Consumer Electronics + Control protocol. This protocol allows different devices connected by an HDMI cable + to communicate. The protocol for CEC version 1.4 is defined in supplements 1 (CEC) + and 2 (HEAC or HDMI Ethernet and Audio Return Channel) of the HDMI 1.4a + (<xref linkend="hdmi" />) specification and the extensions added to CEC version 2.0 + are defined in chapter 11 of the HDMI 2.0 (<xref linkend="hdmi2" />) specification. + </para> + + <para>The bitrate is very slow (effectively no more than 36 bytes per second) and + is based on the ancient AV.link protocol used in old SCART connectors. The protocol + closely resembles a crazy Rube Goldberg contraption and is an unholy mix of low and + high level messages. Some messages, especially those part of the HEAC protocol layered + on top of CEC, need to be handled by the kernel, others can be handled either by the + kernel or by userspace.</para> + + <para>In addition, CEC can be implemented in HDMI receivers, transmitters and in USB + devices that have an HDMI input and an HDMI output and that control just the CEC pin.</para> + + <para>Drivers that support CEC will create a CEC device node (/dev/cecX) + to give userspace access to the CEC adapter. The &CEC-ADAP-G-CAPS; ioctl will tell userspace + what it is allowed to do.</para> + </section> +</chapter> + +<appendix id="cec-user-func"> + <title>Function Reference</title> + <!-- Keep this alphabetically sorted. --> + &sub-cec-func-open; + &sub-cec-func-close; + &sub-cec-func-ioctl; + &sub-cec-func-poll; + <!-- All ioctls go here. --> + &sub-cec-ioc-adap-g-caps; + &sub-cec-ioc-adap-g-log-addrs; + &sub-cec-ioc-adap-g-phys-addr; + &sub-cec-ioc-dqevent; + &sub-cec-ioc-g-mode; + &sub-cec-ioc-receive; +</appendix> diff --git a/Documentation/DocBook/media/v4l/cec-func-close.xml b/Documentation/DocBook/media/v4l/cec-func-close.xml new file mode 100644 index 000000000000..0812c8cd9634 --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-func-close.xml @@ -0,0 +1,64 @@ +<refentry id="cec-func-close"> + <refmeta> + <refentrytitle>cec close()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>cec-close</refname> + <refpurpose>Close a cec device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <unistd.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>close</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</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>Closes the cec device. Resources associated with the file descriptor + are freed. The device configuration remain unchanged.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para><function>close</function> returns 0 on success. On error, -1 is + returned, and <varname>errno</varname> is set appropriately. Possible error + codes are:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EBADF</errorcode></term> + <listitem> + <para><parameter>fd</parameter> is not a valid open file descriptor. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/cec-func-ioctl.xml b/Documentation/DocBook/media/v4l/cec-func-ioctl.xml new file mode 100644 index 000000000000..f92817a2dc80 --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-func-ioctl.xml @@ -0,0 +1,78 @@ +<refentry id="cec-func-ioctl"> + <refmeta> + <refentrytitle>cec ioctl()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>cec-ioctl</refname> + <refpurpose>Control a cec device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <sys/ioctl.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>void *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>CEC ioctl request code as defined in the cec.h header file, + for example CEC_ADAP_G_CAPS.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para>Pointer to a request-specific structure.</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>The <function>ioctl()</function> function manipulates cec device + parameters. The argument <parameter>fd</parameter> must be an open file + descriptor.</para> + <para>The ioctl <parameter>request</parameter> code specifies the cec + function to be called. It has encoded in it whether the argument is an + input, output or read/write parameter, and the size of the argument + <parameter>argp</parameter> in bytes.</para> + <para>Macros and structures definitions specifying cec ioctl requests and + their parameters are located in the cec.h header file. All cec ioctl + requests, their respective function and parameters are specified in + <xref linkend="cec-user-func" />.</para> + </refsect1> + + <refsect1> + &return-value; + + <para>Request-specific error codes are listed in the + individual requests descriptions.</para> + <para>When an ioctl that takes an output or read/write parameter fails, + the parameter remains unmodified.</para> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/cec-func-open.xml b/Documentation/DocBook/media/v4l/cec-func-open.xml new file mode 100644 index 000000000000..2edc5555b81a --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-func-open.xml @@ -0,0 +1,104 @@ +<refentry id="cec-func-open"> + <refmeta> + <refentrytitle>cec open()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>cec-open</refname> + <refpurpose>Open a cec device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <fcntl.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>open</function></funcdef> + <paramdef>const char *<parameter>device_name</parameter></paramdef> + <paramdef>int <parameter>flags</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>device_name</parameter></term> + <listitem> + <para>Device to be opened.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>flags</parameter></term> + <listitem> + <para>Open flags. Access mode must be <constant>O_RDWR</constant>. + </para> + <para>When the <constant>O_NONBLOCK</constant> flag is +given, the &CEC-RECEIVE; ioctl will return &EAGAIN; when no message is +available, and the &CEC-TRANSMIT;, &CEC-ADAP-S-PHYS-ADDR; and +&CEC-ADAP-S-LOG-ADDRS; ioctls all act in non-blocking mode.</para> + <para>Other flags have no effect.</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 open a cec device applications call <function>open()</function> + with the desired device name. The function has no side effects; the device + configuration remain unchanged.</para> + <para>When the device is opened in read-only mode, attempts to modify its + configuration will result in an error, and <varname>errno</varname> will be + set to <errorcode>EBADF</errorcode>.</para> + </refsect1> + <refsect1> + <title>Return Value</title> + + <para><function>open</function> returns the new file descriptor on success. + On error, -1 is returned, and <varname>errno</varname> is set appropriately. + Possible error codes include:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EACCES</errorcode></term> + <listitem> + <para>The requested access to the file is not allowed.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EMFILE</errorcode></term> + <listitem> + <para>The process already has the maximum number of files open. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENFILE</errorcode></term> + <listitem> + <para>The system limit on the total number of open files has been + reached.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENOMEM</errorcode></term> + <listitem> + <para>Insufficient kernel memory was available.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENXIO</errorcode></term> + <listitem> + <para>No device corresponding to this device special file exists. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/cec-func-poll.xml b/Documentation/DocBook/media/v4l/cec-func-poll.xml new file mode 100644 index 000000000000..1bddbde0142d --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-func-poll.xml @@ -0,0 +1,94 @@ +<refentry id="cec-func-poll"> + <refmeta> + <refentrytitle>cec poll()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>cec-poll</refname> + <refpurpose>Wait for some event on a file descriptor</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <sys/poll.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>poll</function></funcdef> + <paramdef>struct pollfd *<parameter>ufds</parameter></paramdef> + <paramdef>unsigned int <parameter>nfds</parameter></paramdef> + <paramdef>int <parameter>timeout</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <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>With the <function>poll()</function> function applications +can wait for CEC events.</para> + + <para>On success <function>poll()</function> returns the number of +file descriptors that have been selected (that is, file descriptors +for which the <structfield>revents</structfield> field of the +respective <structname>pollfd</structname> structure is non-zero). +CEC devices set the <constant>POLLIN</constant> and +<constant>POLLRDNORM</constant> flags in the +<structfield>revents</structfield> field if there are messages in the +receive queue. If the transmit queue has room for new messages, the +<constant>POLLOUT</constant> and <constant>POLLWRNORM</constant> +flags are set. If there are events in the event queue, then the +<constant>POLLPRI</constant> flag is set. +When the function timed out it returns a value of zero, on +failure it returns <returnvalue>-1</returnvalue> and the +<varname>errno</varname> variable is set appropriately. +</para> + + <para>For more details see the +<function>poll()</function> manual page.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, <function>poll()</function> returns the number +structures which have non-zero <structfield>revents</structfield> +fields, or zero if the call timed out. On error +<returnvalue>-1</returnvalue> is returned, and the +<varname>errno</varname> variable is set appropriately:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EBADF</errorcode></term> + <listitem> + <para>One or more of the <parameter>ufds</parameter> members +specify an invalid file descriptor.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EFAULT</errorcode></term> + <listitem> + <para><parameter>ufds</parameter> references an inaccessible +memory area.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINTR</errorcode></term> + <listitem> + <para>The call was interrupted by a signal.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <parameter>nfds</parameter> argument is greater +than <constant>OPEN_MAX</constant>.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/cec-ioc-adap-g-caps.xml b/Documentation/DocBook/media/v4l/cec-ioc-adap-g-caps.xml new file mode 100644 index 000000000000..3523ef2259b1 --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-ioc-adap-g-caps.xml @@ -0,0 +1,151 @@ +<refentry id="cec-ioc-adap-g-caps"> + <refmeta> + <refentrytitle>ioctl CEC_ADAP_G_CAPS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>CEC_ADAP_G_CAPS</refname> + <refpurpose>Query device capabilities</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_caps *<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_ADAP_G_CAPS</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>All cec devices must support the <constant>CEC_ADAP_G_CAPS</constant> + ioctl. To query device information, applications call the ioctl with a + pointer to a &cec-caps;. The driver fills the structure and returns + the information to the application. + The ioctl never fails.</para> + + <table pgwide="1" frame="none" id="cec-caps"> + <title>struct <structname>cec_caps</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>char</entry> + <entry><structfield>driver[32]</structfield></entry> + <entry>The name of the cec adapter driver.</entry> + </row> + <row> + <entry>char</entry> + <entry><structfield>name[32]</structfield></entry> + <entry>The name of this CEC adapter. The combination <structfield>driver</structfield> + and <structfield>name</structfield> must be unique.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capabilities</structfield></entry> + <entry>The capabilities of the CEC adapter, see <xref + linkend="cec-capabilities" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>version</structfield></entry> + <entry>CEC Framework API version, formatted with the + <constant>KERNEL_VERSION()</constant> macro.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="cec-capabilities"> + <title>CEC Capabilities Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>CEC_CAP_PHYS_ADDR</constant></entry> + <entry>0x00000001</entry> + <entry>Userspace has to configure the physical address by + calling &CEC-ADAP-S-PHYS-ADDR;. If this capability isn't set, + then setting the physical address is handled by the kernel + whenever the EDID is set (for an HDMI receiver) or read (for + an HDMI transmitter).</entry> + </row> + <row> + <entry><constant>CEC_CAP_LOG_ADDRS</constant></entry> + <entry>0x00000002</entry> + <entry>Userspace has to configure the logical addresses by + calling &CEC-ADAP-S-LOG-ADDRS;. If this capability isn't set, + then the kernel will have configured this.</entry> + </row> + <row> + <entry><constant>CEC_CAP_TRANSMIT</constant></entry> + <entry>0x00000004</entry> + <entry>Userspace can transmit CEC messages by calling &CEC-TRANSMIT;. This + implies that userspace can be a follower as well, since being able to + transmit messages is a prerequisite of becoming a follower. If this + capability isn't set, then the kernel will handle all CEC transmits + and process all CEC messages it receives. + </entry> + </row> + <row> + <entry><constant>CEC_CAP_PASSTHROUGH</constant></entry> + <entry>0x00000008</entry> + <entry>Userspace can use the passthrough mode by + calling &CEC-S-MODE;.</entry> + </row> + <row> + <entry><constant>CEC_CAP_RC</constant></entry> + <entry>0x00000010</entry> + <entry>This adapter supports the remote control protocol.</entry> + </row> + <row> + <entry><constant>CEC_CAP_MONITOR_ALL</constant></entry> + <entry>0x00000020</entry> + <entry>The CEC hardware can monitor all messages, not just directed and + broadcast messages.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/cec-ioc-adap-g-log-addrs.xml b/Documentation/DocBook/media/v4l/cec-ioc-adap-g-log-addrs.xml new file mode 100644 index 000000000000..302b8294f7fc --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-ioc-adap-g-log-addrs.xml @@ -0,0 +1,329 @@ +<refentry id="cec-ioc-adap-g-log-addrs"> + <refmeta> + <refentrytitle>ioctl CEC_ADAP_G_LOG_ADDRS, CEC_ADAP_S_LOG_ADDRS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>CEC_ADAP_G_LOG_ADDRS</refname> + <refname>CEC_ADAP_S_LOG_ADDRS</refname> + <refpurpose>Get or set the logical addresses</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_log_addrs *<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_ADAP_G_LOG_ADDRS, CEC_ADAP_S_LOG_ADDRS</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 query the current CEC logical addresses, applications call the +<constant>CEC_ADAP_G_LOG_ADDRS</constant> ioctl with a pointer to a +<structname>cec_log_addrs</structname> structure where the drivers stores the +logical addresses.</para> + + <para>To set new logical addresses, applications fill in struct <structname>cec_log_addrs</structname> +and call the <constant>CEC_ADAP_S_LOG_ADDRS</constant> ioctl with a pointer to this struct. +The <constant>CEC_ADAP_S_LOG_ADDRS</constant> ioctl is only available if +<constant>CEC_CAP_LOG_ADDRS</constant> is set (&ENOTTY; is returned otherwise). This ioctl will block until all +requested logical addresses have been claimed. <constant>CEC_ADAP_S_LOG_ADDRS</constant> +can only be called by a file handle in initiator mode (see &CEC-S-MODE;).</para> + + <table pgwide="1" frame="none" id="cec-log-addrs"> + <title>struct <structname>cec_log_addrs</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u8</entry> + <entry><structfield>log_addr</structfield>[CEC_MAX_LOG_ADDRS]</entry> + <entry>The actual logical addresses that were claimed. This is set by the + driver. If no logical address could be claimed, then it is set to + <constant>CEC_LOG_ADDR_INVALID</constant>. If this adapter is Unregistered, + then <structfield>log_addr[0]</structfield> is set to 0xf and all others to + <constant>CEC_LOG_ADDR_INVALID</constant>.</entry> + </row> + <row> + <entry>__u16</entry> + <entry><structfield>log_addr_mask</structfield></entry> + <entry>The bitmask of all logical addresses this adapter has claimed. + If this adapter is Unregistered then <structfield>log_addr_mask</structfield> + sets bit 15 and clears all other bits. If this adapter is not configured at all, then + <structfield>log_addr_mask</structfield> is set to 0. Set by the driver.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>cec_version</structfield></entry> + <entry>The CEC version that this adapter shall use. See + <xref linkend="cec-versions" />. + Used to implement the <constant>CEC_MSG_CEC_VERSION</constant> and + <constant>CEC_MSG_REPORT_FEATURES</constant> messages. Note that + <constant>CEC_OP_CEC_VERSION_1_3A</constant> is not allowed + by the CEC framework. + </entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>num_log_addrs</structfield></entry> + <entry>Number of logical addresses to set up. Must be ≤ + <structfield>available_log_addrs</structfield> as returned by + &CEC-ADAP-G-CAPS;. All arrays in this structure are only filled up to + index <structfield>available_log_addrs</structfield>-1. The remaining + array elements will be ignored. Note that the CEC 2.0 standard allows + for a maximum of 2 logical addresses, although some hardware has support + for more. <constant>CEC_MAX_LOG_ADDRS</constant> is 4. The driver will + return the actual number of logical addresses it could claim, which may + be less than what was requested. If this field is set to 0, then the + CEC adapter shall clear all claimed logical addresses and all other + fields will be ignored.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>vendor_id</structfield></entry> + <entry>The vendor ID is a 24-bit number that identifies the specific + vendor or entity. Based on this ID vendor specific commands may be + defined. If you do not want a vendor ID then set it to + <constant>CEC_VENDOR_ID_NONE</constant>.</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>char</entry> + <entry><structfield>osd_name</structfield>[15]</entry> + <entry>The On-Screen Display name as is returned by the + <constant>CEC_MSG_SET_OSD_NAME</constant> message.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>primary_device_type</structfield>[CEC_MAX_LOG_ADDRS]</entry> + <entry>Primary device type for each logical address. See + <xref linkend="cec-prim-dev-types" /> for possible types.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>log_addr_type</structfield>[CEC_MAX_LOG_ADDRS]</entry> + <entry>Logical address types. See <xref linkend="cec-log-addr-types" /> for + possible types. The driver will update this with the actual logical address + type that it claimed (e.g. it may have to fallback to + <constant>CEC_LOG_ADDR_TYPE_UNREGISTERED</constant>).</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>all_device_types</structfield>[CEC_MAX_LOG_ADDRS]</entry> + <entry>CEC 2.0 specific: all device types. See <xref linkend="cec-all-dev-types-flags" />. + Used to implement the <constant>CEC_MSG_REPORT_FEATURES</constant> message. + This field is ignored if <structfield>cec_version</structfield> < + <constant>CEC_OP_CEC_VERSION_2_0</constant>.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>features</structfield>[CEC_MAX_LOG_ADDRS][12]</entry> + <entry>Features for each logical address. Used to implement the + <constant>CEC_MSG_REPORT_FEATURES</constant> message. The 12 bytes include + both the RC Profile and the Device Features. + This field is ignored if <structfield>cec_version</structfield> < + <constant>CEC_OP_CEC_VERSION_2_0</constant>.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="cec-versions"> + <title>CEC Versions</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>CEC_OP_CEC_VERSION_1_3A</constant></entry> + <entry>4</entry> + <entry>CEC version according to the HDMI 1.3a standard.</entry> + </row> + <row> + <entry><constant>CEC_OP_CEC_VERSION_1_4B</constant></entry> + <entry>5</entry> + <entry>CEC version according to the HDMI 1.4b standard.</entry> + </row> + <row> + <entry><constant>CEC_OP_CEC_VERSION_2_0</constant></entry> + <entry>6</entry> + <entry>CEC version according to the HDMI 2.0 standard.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="cec-prim-dev-types"> + <title>CEC Primary Device Types</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>CEC_OP_PRIM_DEVTYPE_TV</constant></entry> + <entry>0</entry> + <entry>Use for a TV.</entry> + </row> + <row> + <entry><constant>CEC_OP_PRIM_DEVTYPE_RECORD</constant></entry> + <entry>1</entry> + <entry>Use for a recording device.</entry> + </row> + <row> + <entry><constant>CEC_OP_PRIM_DEVTYPE_TUNER</constant></entry> + <entry>3</entry> + <entry>Use for a device with a tuner.</entry> + </row> + <row> + <entry><constant>CEC_OP_PRIM_DEVTYPE_PLAYBACK</constant></entry> + <entry>4</entry> + <entry>Use for a playback device.</entry> + </row> + <row> + <entry><constant>CEC_OP_PRIM_DEVTYPE_AUDIOSYSTEM</constant></entry> + <entry>5</entry> + <entry>Use for an audio system (e.g. an audio/video receiver).</entry> + </row> + <row> + <entry><constant>CEC_OP_PRIM_DEVTYPE_SWITCH</constant></entry> + <entry>6</entry> + <entry>Use for a CEC switch.</entry> + </row> + <row> + <entry><constant>CEC_OP_PRIM_DEVTYPE_VIDEOPROC</constant></entry> + <entry>7</entry> + <entry>Use for a video processor device.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="cec-log-addr-types"> + <title>CEC Logical Address Types</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>CEC_LOG_ADDR_TYPE_TV</constant></entry> + <entry>0</entry> + <entry>Use for a TV.</entry> + </row> + <row> + <entry><constant>CEC_LOG_ADDR_TYPE_RECORD</constant></entry> + <entry>1</entry> + <entry>Use for a recording device.</entry> + </row> + <row> + <entry><constant>CEC_LOG_ADDR_TYPE_TUNER</constant></entry> + <entry>2</entry> + <entry>Use for a tuner device.</entry> + </row> + <row> + <entry><constant>CEC_LOG_ADDR_TYPE_PLAYBACK</constant></entry> + <entry>3</entry> + <entry>Use for a playback device.</entry> + </row> + <row> + <entry><constant>CEC_LOG_ADDR_TYPE_AUDIOSYSTEM</constant></entry> + <entry>4</entry> + <entry>Use for an audio system device.</entry> + </row> + <row> + <entry><constant>CEC_LOG_ADDR_TYPE_SPECIFIC</constant></entry> + <entry>5</entry> + <entry>Use for a second TV or for a video processor device.</entry> + </row> + <row> + <entry><constant>CEC_LOG_ADDR_TYPE_UNREGISTERED</constant></entry> + <entry>6</entry> + <entry>Use this if you just want to remain unregistered. + Used for pure CEC switches or CDC-only devices (CDC: + Capability Discovery and Control).</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="cec-all-dev-types-flags"> + <title>CEC All Device Types Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>CEC_OP_ALL_DEVTYPE_TV</constant></entry> + <entry>0x80</entry> + <entry>This supports the TV type.</entry> + </row> + <row> + <entry><constant>CEC_OP_ALL_DEVTYPE_RECORD</constant></entry> + <entry>0x40</entry> + <entry>This supports the Recording type.</entry> + </row> + <row> + <entry><constant>CEC_OP_ALL_DEVTYPE_TUNER</constant></entry> + <entry>0x20</entry> + <entry>This supports the Tuner type.</entry> + </row> + <row> + <entry><constant>CEC_OP_ALL_DEVTYPE_PLAYBACK</constant></entry> + <entry>0x10</entry> + <entry>This supports the Playback type.</entry> + </row> + <row> + <entry><constant>CEC_OP_ALL_DEVTYPE_AUDIOSYSTEM</constant></entry> + <entry>0x08</entry> + <entry>This supports the Audio System type.</entry> + </row> + <row> + <entry><constant>CEC_OP_ALL_DEVTYPE_SWITCH</constant></entry> + <entry>0x04</entry> + <entry>This supports the CEC Switch or Video Processing type.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/cec-ioc-adap-g-phys-addr.xml b/Documentation/DocBook/media/v4l/cec-ioc-adap-g-phys-addr.xml new file mode 100644 index 000000000000..d95f1785080c --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-ioc-adap-g-phys-addr.xml @@ -0,0 +1,86 @@ +<refentry id="cec-ioc-adap-g-phys-addr"> + <refmeta> + <refentrytitle>ioctl CEC_ADAP_G_PHYS_ADDR, CEC_ADAP_S_PHYS_ADDR</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>CEC_ADAP_G_PHYS_ADDR</refname> + <refname>CEC_ADAP_S_PHYS_ADDR</refname> + <refpurpose>Get or set the physical address</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>__u16 *<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_ADAP_G_PHYS_ADDR, CEC_ADAP_S_PHYS_ADDR</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 query the current physical address applications call the +<constant>CEC_ADAP_G_PHYS_ADDR</constant> ioctl with a pointer to an __u16 +where the driver stores the physical address.</para> + + <para>To set a new physical address applications store the physical address in +an __u16 and call the <constant>CEC_ADAP_S_PHYS_ADDR</constant> ioctl with a +pointer to this integer. <constant>CEC_ADAP_S_PHYS_ADDR</constant> is only +available if <constant>CEC_CAP_PHYS_ADDR</constant> is set (&ENOTTY; will be returned +otherwise). <constant>CEC_ADAP_S_PHYS_ADDR</constant> +can only be called by a file handle in initiator mode (see &CEC-S-MODE;), if not +&EBUSY; will be returned.</para> + + <para>The physical address is a 16-bit number where each group of 4 bits +represent a digit of the physical address a.b.c.d where the most significant +4 bits represent 'a'. The CEC root device (usually the TV) has address 0.0.0.0. +Every device that is hooked up to an input of the TV has address a.0.0.0 (where +'a' is ≥ 1), devices hooked up to those in turn have addresses a.b.0.0, etc. +So a topology of up to 5 devices deep is supported. The physical address a +device shall use is stored in the EDID of the sink.</para> + +<para>For example, the EDID for each HDMI input of the TV will have a different +physical address of the form a.0.0.0 that the sources will read out and use as +their physical address.</para> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/cec-ioc-dqevent.xml b/Documentation/DocBook/media/v4l/cec-ioc-dqevent.xml new file mode 100644 index 000000000000..697dde575cd4 --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-ioc-dqevent.xml @@ -0,0 +1,202 @@ +<refentry id="cec-ioc-g-event"> + <refmeta> + <refentrytitle>ioctl CEC_DQEVENT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>CEC_DQEVENT</refname> + <refpurpose>Dequeue a CEC event</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_event *<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_DQEVENT</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>CEC devices can send asynchronous events. These can be retrieved by calling + the <constant>CEC_DQEVENT</constant> ioctl. If the file descriptor is in non-blocking + mode and no event is pending, then it will return -1 and set errno to the &EAGAIN;.</para> + + <para>The internal event queues are per-filehandle and per-event type. If there is + no more room in a queue then the last event is overwritten with the new one. This + means that intermediate results can be thrown away but that the latest event is always + available. This also means that is it possible to read two successive events that have + the same value (e.g. two CEC_EVENT_STATE_CHANGE events with the same state). In that + case the intermediate state changes were lost but it is guaranteed that the state + did change in between the two events.</para> + + <table pgwide="1" frame="none" id="cec-event-state-change"> + <title>struct <structname>cec_event_state_change</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u16</entry> + <entry><structfield>phys_addr</structfield></entry> + <entry>The current physical address.</entry> + </row> + <row> + <entry>__u16</entry> + <entry><structfield>log_addr_mask</structfield></entry> + <entry>The current set of claimed logical addresses.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="cec-event-lost-msgs"> + <title>struct <structname>cec_event_lost_msgs</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>lost_msgs</structfield></entry> + <entry>Set to the number of lost messages since the filehandle + was opened or since the last time this event was dequeued for + this filehandle. The messages lost are the oldest messages. So + when a new message arrives and there is no more room, then the + oldest message is discarded to make room for the new one. The + internal size of the message queue guarantees that all messages + received in the last two seconds will be stored. Since messages + should be replied to within a second according to the CEC + specification, this is more than enough. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="cec-event"> + <title>struct <structname>cec_event</structname></title> + <tgroup cols="4"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u64</entry> + <entry><structfield>ts</structfield></entry> + <entry>Timestamp of the event in ns.</entry> + <entry></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>event</structfield></entry> + <entry>The CEC event type, see <xref linkend="cec-events" />.</entry> + <entry></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Event flags, see <xref linkend="cec-event-flags" />.</entry> + <entry></entry> + </row> + <row> + <entry>union</entry> + <entry>(anonymous)</entry> + <entry></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry>struct cec_event_state_change</entry> + <entry><structfield>state_change</structfield></entry> + <entry>The new adapter state as sent by the <constant>CEC_EVENT_STATE_CHANGE</constant> + event.</entry> + </row> + <row> + <entry></entry> + <entry>struct cec_event_lost_msgs</entry> + <entry><structfield>lost_msgs</structfield></entry> + <entry>The number of lost messages as sent by the <constant>CEC_EVENT_LOST_MSGS</constant> + event.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="cec-events"> + <title>CEC Events Types</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>CEC_EVENT_STATE_CHANGE</constant></entry> + <entry>1</entry> + <entry>Generated when the CEC Adapter's state changes. When open() is + called an initial event will be generated for that filehandle with the + CEC Adapter's state at that time. + </entry> + </row> + <row> + <entry><constant>CEC_EVENT_LOST_MSGS</constant></entry> + <entry>2</entry> + <entry>Generated if one or more CEC messages were lost because the + application didn't dequeue CEC messages fast enough.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="cec-event-flags"> + <title>CEC Event Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>CEC_EVENT_FL_INITIAL_VALUE</constant></entry> + <entry>1</entry> + <entry>Set for the initial events that are generated when the device is + opened. See the table above for which events do this. This allows + applications to learn the initial state of the CEC adapter at open() + time.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/cec-ioc-g-mode.xml b/Documentation/DocBook/media/v4l/cec-ioc-g-mode.xml new file mode 100644 index 000000000000..26b4282ad134 --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-ioc-g-mode.xml @@ -0,0 +1,255 @@ +<refentry id="cec-ioc-g-mode"> + <refmeta> + <refentrytitle>ioctl CEC_G_MODE, CEC_S_MODE</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>CEC_G_MODE</refname> + <refname>CEC_S_MODE</refname> + <refpurpose>Get or set exclusive use of the CEC adapter</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>__u32 *<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_G_MODE, CEC_S_MODE</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>By default any filehandle can use &CEC-TRANSMIT; and &CEC-RECEIVE;, but +in order to prevent applications from stepping on each others toes it must be possible +to obtain exclusive access to the CEC adapter. This ioctl sets the filehandle +to initiator and/or follower mode which can be exclusive depending on the chosen +mode. The initiator is the filehandle that is used +to initiate messages, i.e. it commands other CEC devices. The follower is the filehandle +that receives messages sent to the CEC adapter and processes them. The same filehandle +can be both initiator and follower, or this role can be taken by two different +filehandles.</para> + + <para>When a CEC message is received, then the CEC framework will decide how +it will be processed. If the message is a reply to an earlier transmitted message, +then the reply is sent back to the filehandle that is waiting for it. In addition +the CEC framework will process it.</para> + + <para>If the message is not a reply, then the CEC framework will process it +first. If there is no follower, then the message is just discarded and a feature +abort is sent back to the initiator if the framework couldn't process it. If there +is a follower, then the message is passed on to the follower who will use +&CEC-RECEIVE; to dequeue the new message. The framework expects the follower to +make the right decisions.</para> + + <para>The CEC framework will process core messages unless requested otherwise +by the follower. The follower can enable the passthrough mode. In that case, the +CEC framework will pass on most core messages without processing them and +the follower will have to implement those messages. There are some messages +that the core will always process, regardless of the passthrough mode. See +<xref linkend="cec-core-processing" /> for details.</para> + + <para>If there is no initiator, then any CEC filehandle can use &CEC-TRANSMIT;. +If there is an exclusive initiator then only that initiator can call &CEC-TRANSMIT;. +The follower can of course always call &CEC-TRANSMIT;.</para> + + <para>Available initiator modes are:</para> + + <table pgwide="1" frame="none" id="cec-mode-initiator"> + <title>Initiator Modes</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>CEC_MODE_NO_INITIATOR</constant></entry> + <entry>0x0</entry> + <entry>This is not an initiator, i.e. it cannot transmit CEC messages + or make any other changes to the CEC adapter.</entry> + </row> + <row> + <entry><constant>CEC_MODE_INITIATOR</constant></entry> + <entry>0x1</entry> + <entry>This is an initiator (the default when the device is opened) and it + can transmit CEC messages and make changes to the CEC adapter, unless there + is an exclusive initiator.</entry> + </row> + <row> + <entry><constant>CEC_MODE_EXCL_INITIATOR</constant></entry> + <entry>0x2</entry> + <entry>This is an exclusive initiator and this file descriptor is the only one + that can transmit CEC messages and make changes to the CEC adapter. If someone + else is already the exclusive initiator then an attempt to become one will return + the &EBUSY; error.</entry> + </row> + </tbody> + </tgroup> + </table> + + <para>Available follower modes are:</para> + + <table pgwide="1" frame="none" id="cec-mode-follower"> + <title>Follower Modes</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>CEC_MODE_NO_FOLLOWER</constant></entry> + <entry>0x00</entry> + <entry>This is not a follower (the default when the device is opened).</entry> + </row> + <row> + <entry><constant>CEC_MODE_FOLLOWER</constant></entry> + <entry>0x10</entry> + <entry>This is a follower and it will receive CEC messages unless there is + an exclusive follower. You cannot become a follower if <constant>CEC_CAP_TRANSMIT</constant> + is not set or if <constant>CEC_MODE_NO_INITIATOR</constant> was specified, + &EINVAL; is returned in that case.</entry> + </row> + <row> + <entry><constant>CEC_MODE_EXCL_FOLLOWER</constant></entry> + <entry>0x20</entry> + <entry>This is an exclusive follower and only this file descriptor will receive + CEC messages for processing. If someone else is already the exclusive follower + then an attempt to become one will return the &EBUSY; error. You cannot become + a follower if <constant>CEC_CAP_TRANSMIT</constant> is not set or if + <constant>CEC_MODE_NO_INITIATOR</constant> was specified, &EINVAL; is returned + in that case.</entry> + </row> + <row> + <entry><constant>CEC_MODE_EXCL_FOLLOWER_PASSTHRU</constant></entry> + <entry>0x30</entry> + <entry>This is an exclusive follower and only this file descriptor will receive + CEC messages for processing. In addition it will put the CEC device into + passthrough mode, allowing the exclusive follower to handle most core messages + instead of relying on the CEC framework for that. If someone else is already the + exclusive follower then an attempt to become one will return the &EBUSY; error. + You cannot become a follower if <constant>CEC_CAP_TRANSMIT</constant> + is not set or if <constant>CEC_MODE_NO_INITIATOR</constant> was specified, + &EINVAL; is returned in that case.</entry> + </row> + <row> + <entry><constant>CEC_MODE_MONITOR</constant></entry> + <entry>0xe0</entry> + <entry>Put the file descriptor into monitor mode. Can only be used in combination + with <constant>CEC_MODE_NO_INITIATOR</constant>, otherwise &EINVAL; will be + returned. In monitor mode all messages this CEC device transmits and all messages + it receives (both broadcast messages and directed messages for one its logical + addresses) will be reported. This is very useful for debugging. This is only + allowed if the process has the <constant>CAP_NET_ADMIN</constant> + capability. If that is not set, then &EPERM; is returned.</entry> + </row> + <row> + <entry><constant>CEC_MODE_MONITOR_ALL</constant></entry> + <entry>0xf0</entry> + <entry>Put the file descriptor into 'monitor all' mode. Can only be used in combination + with <constant>CEC_MODE_NO_INITIATOR</constant>, otherwise &EINVAL; will be + returned. In 'monitor all' mode all messages this CEC device transmits and all messages + it receives, including directed messages for other CEC devices will be reported. This + is very useful for debugging, but not all devices support this. This mode requires that + the <constant>CEC_CAP_MONITOR_ALL</constant> capability is set, otherwise &EINVAL; is + returned. This is only allowed if the process has the <constant>CAP_NET_ADMIN</constant> + capability. If that is not set, then &EPERM; is returned.</entry> + </row> + </tbody> + </tgroup> + </table> + + <para>Core message processing details:</para> + + <table pgwide="1" frame="none" id="cec-core-processing"> + <title>Core Message Processing</title> + <tgroup cols="2"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>CEC_MSG_GET_CEC_VERSION</constant></entry> + <entry>When in passthrough mode this message has to be handled by userspace, + otherwise the core will return the CEC version that was set with &CEC-ADAP-S-LOG-ADDRS;.</entry> + </row> + <row> + <entry><constant>CEC_MSG_GIVE_DEVICE_VENDOR_ID</constant></entry> + <entry>When in passthrough mode this message has to be handled by userspace, + otherwise the core will return the vendor ID that was set with &CEC-ADAP-S-LOG-ADDRS;.</entry> + </row> + <row> + <entry><constant>CEC_MSG_ABORT</constant></entry> + <entry>When in passthrough mode this message has to be handled by userspace, + otherwise the core will return a feature refused message as per the specification.</entry> + </row> + <row> + <entry><constant>CEC_MSG_GIVE_PHYSICAL_ADDR</constant></entry> + <entry>When in passthrough mode this message has to be handled by userspace, + otherwise the core will report the current physical address.</entry> + </row> + <row> + <entry><constant>CEC_MSG_GIVE_OSD_NAME</constant></entry> + <entry>When in passthrough mode this message has to be handled by userspace, + otherwise the core will report the current OSD name as was set with + &CEC-ADAP-S-LOG-ADDRS;.</entry> + </row> + <row> + <entry><constant>CEC_MSG_GIVE_FEATURES</constant></entry> + <entry>When in passthrough mode this message has to be handled by userspace, + otherwise the core will report the current features as was set with + &CEC-ADAP-S-LOG-ADDRS; or the message is ignore if the CEC version was + older than 2.0.</entry> + </row> + <row> + <entry><constant>CEC_MSG_USER_CONTROL_PRESSED</constant></entry> + <entry>If <constant>CEC_CAP_RC</constant> is set, then generate a remote control + key press. This message is always passed on to userspace.</entry> + </row> + <row> + <entry><constant>CEC_MSG_USER_CONTROL_RELEASED</constant></entry> + <entry>If <constant>CEC_CAP_RC</constant> is set, then generate a remote control + key release. This message is always passed on to userspace.</entry> + </row> + <row> + <entry><constant>CEC_MSG_REPORT_PHYSICAL_ADDR</constant></entry> + <entry>The CEC framework will make note of the reported physical address + and then just pass the message on to userspace.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/cec-ioc-receive.xml b/Documentation/DocBook/media/v4l/cec-ioc-receive.xml new file mode 100644 index 000000000000..fde9f8678e67 --- /dev/null +++ b/Documentation/DocBook/media/v4l/cec-ioc-receive.xml @@ -0,0 +1,274 @@ +<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> |
