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Merge branch 'topic/cec' into patchwork

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* topic/cec:
  [media] DocBook/media: add CEC documentation
  [media] s5p_cec: get rid of an unused var
  [media] move s5p-cec to staging
  [media] vivid: add CEC emulation
  [media] cec: s5p-cec: Add s5p-cec driver
  [media] cec: adv7511: add cec support
  [media] cec: adv7842: add cec support
  [media] cec: adv7604: add cec support
  [media] cec: add compat32 ioctl support
  [media] cec/TODO: add TODO file so we know why this is still in staging
  [media] cec: add HDMI CEC framework (api)
  [media] cec: add HDMI CEC framework (adapter)
  [media] cec: add HDMI CEC framework (core)
  [media] cec-funcs.h: static inlines to pack/unpack CEC messages
  [media] cec.h: add cec header
  [media] cec-edid: add module for EDID CEC helper functions
  [media] cec.txt: add CEC framework documentation
  [media] rc: Add HDMI CEC protocol handling
This commit is contained in:
Mauro Carvalho Chehab
2016-07-08 18:16:10 -03:00
parent fb810cb5ed c7169ad561
commit cbb5c8355a
60 changed files with 10428 additions and 129 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/DocBook/device-drivers.tmpl
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@@ -300,6 +300,9 @@ X!Isound/sound_firmware.c
!Iinclude/media/media-devnode.h
!Iinclude/media/media-entity.h
</sect1>
<sect1><title>Consumer Electronics Control devices</title>
!Iinclude/media/cec-edid.h
</sect1>
</chapter>

2
Documentation/DocBook/media/Makefile
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@@ -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)

10
Documentation/DocBook/media/v4l/biblio.xml
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@@ -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>

75
Documentation/DocBook/media/v4l/cec-api.xml Normal file
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@@ -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>

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Documentation/DocBook/media/v4l/cec-func-close.xml Normal file
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@@ -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 &lt;unistd.h&gt;</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>

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Documentation/DocBook/media/v4l/cec-func-ioctl.xml Normal file
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@@ -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 &lt;sys/ioctl.h&gt;</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>

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@@ -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 &lt;fcntl.h&gt;</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>

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@@ -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 &lt;sys/poll.h&gt;</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>

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@@ -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>

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@@ -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 &le;
<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> &lt;
<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> &lt;
<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>

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<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 &ge; 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>

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<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>

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<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>

274
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View File

@@ -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>

6
Documentation/DocBook/media_api.tmpl
View File

@@ -75,7 +75,7 @@
</mediaobject>
</figure>
<para>The media infrastructure API was designed to control such
devices. It is divided into four parts.</para>
devices. It is divided into five parts.</para>
<para>The first part covers radio, video capture and output,
cameras, analog TV devices and codecs.</para>
<para>The second part covers the
@@ -87,6 +87,7 @@
<xref linkend="fe-delivery-system-t" />.</para>
<para>The third part covers the Remote Controller API.</para>
<para>The fourth part covers the Media Controller API.</para>
<para>The fifth part covers the CEC (Consumer Electronics Control) API.</para>
<para>It should also be noted that a media device may also have audio
components, like mixers, PCM capture, PCM playback, etc, which
are controlled via ALSA API.</para>
@@ -107,6 +108,9 @@
<part id="media_common">
&sub-media-controller;
</part>
<part id="cec">
&sub-cec-api;
</part>
<chapter id="gen_errors">
&sub-gen-errors;

267
Documentation/cec.txt Normal file
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@@ -0,0 +1,267 @@
CEC Kernel Support
==================
The CEC framework provides a unified kernel interface for use with HDMI CEC
hardware. It is designed to handle a multiple types of hardware (receivers,
transmitters, USB dongles). The framework also gives the option to decide
what to do in the kernel driver and what should be handled by userspace
applications. In addition it integrates the remote control passthrough
feature into the kernel's remote control framework.
The CEC Protocol
----------------
The CEC protocol enables consumer electronic devices to communicate with each
other through the HDMI connection. The protocol uses logical addresses in the
communication. The logical address is strictly connected with the functionality
provided by the device. The TV acting as the communication hub is always
assigned address 0. The physical address is determined by the physical
connection between devices.
The CEC framework described here is up to date with the CEC 2.0 specification.
It is documented in the HDMI 1.4 specification with the new 2.0 bits documented
in the HDMI 2.0 specification. But for most of the features the freely available
HDMI 1.3a specification is sufficient:
http://www.microprocessor.org/HDMISpecification13a.pdf
The Kernel Interface
====================
CEC Adapter
-----------
The struct cec_adapter represents the CEC adapter hardware. It is created by
calling cec_allocate_adapter() and deleted by calling cec_delete_adapter():
struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
void *priv, const char *name, u32 caps, u8 available_las,
struct device *parent);
void cec_delete_adapter(struct cec_adapter *adap);
To create an adapter you need to pass the following information:
ops: adapter operations which are called by the CEC framework and that you
have to implement.
priv: will be stored in adap->priv and can be used by the adapter ops.
name: the name of the CEC adapter. Note: this name will be copied.
caps: capabilities of the CEC adapter. These capabilities determine the
capabilities of the hardware and which parts are to be handled
by userspace and which parts are handled by kernelspace. The
capabilities are returned by CEC_ADAP_G_CAPS.
available_las: the number of simultaneous logical addresses that this
adapter can handle. Must be 1 <= available_las <= CEC_MAX_LOG_ADDRS.
parent: the parent device.
To register the /dev/cecX device node and the remote control device (if
CEC_CAP_RC is set) you call:
int cec_register_adapter(struct cec_adapter *adap);
To unregister the devices call:
void cec_unregister_adapter(struct cec_adapter *adap);
Note: if cec_register_adapter() fails, then call cec_delete_adapter() to
clean up. But if cec_register_adapter() succeeded, then only call
cec_unregister_adapter() to clean up, never cec_delete_adapter(). The
unregister function will delete the adapter automatically once the last user
of that /dev/cecX device has closed its file handle.
Implementing the Low-Level CEC Adapter
--------------------------------------
The following low-level adapter operations have to be implemented in
your driver:
struct cec_adap_ops {
/* Low-level callbacks */
int (*adap_enable)(struct cec_adapter *adap, bool enable);
int (*adap_monitor_all_enable)(struct cec_adapter *adap, bool enable);
int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr);
int (*adap_transmit)(struct cec_adapter *adap, u8 attempts,
u32 signal_free_time, struct cec_msg *msg);
void (*adap_log_status)(struct cec_adapter *adap);
/* High-level callbacks */
...
};
The three low-level ops deal with various aspects of controlling the CEC adapter
hardware:
To enable/disable the hardware:
int (*adap_enable)(struct cec_adapter *adap, bool enable);
This callback enables or disables the CEC hardware. Enabling the CEC hardware
means powering it up in a state where no logical addresses are claimed. This
op assumes that the physical address (adap->phys_addr) is valid when enable is
true and will not change while the CEC adapter remains enabled. The initial
state of the CEC adapter after calling cec_allocate_adapter() is disabled.
Note that adap_enable must return 0 if enable is false.
To enable/disable the 'monitor all' mode:
int (*adap_monitor_all_enable)(struct cec_adapter *adap, bool enable);
If enabled, then the adapter should be put in a mode to also monitor messages
that not for us. Not all hardware supports this and this function is only
called if the CEC_CAP_MONITOR_ALL capability is set. This callback is optional
(some hardware may always be in 'monitor all' mode).
Note that adap_monitor_all_enable must return 0 if enable is false.
To program a new logical address:
int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr);
If logical_addr == CEC_LOG_ADDR_INVALID then all programmed logical addresses
are to be erased. Otherwise the given logical address should be programmed.
If the maximum number of available logical addresses is exceeded, then it
should return -ENXIO. Once a logical address is programmed the CEC hardware
can receive directed messages to that address.
Note that adap_log_addr must return 0 if logical_addr is CEC_LOG_ADDR_INVALID.
To transmit a new message:
int (*adap_transmit)(struct cec_adapter *adap, u8 attempts,
u32 signal_free_time, struct cec_msg *msg);
This transmits a new message. The attempts argument is the suggested number of
attempts for the transmit.
The signal_free_time is the number of data bit periods that the adapter should
wait when the line is free before attempting to send a message. This value
depends on whether this transmit is a retry, a message from a new initiator or
a new message for the same initiator. Most hardware will handle this
automatically, but in some cases this information is needed.
The CEC_FREE_TIME_TO_USEC macro can be used to convert signal_free_time to
microseconds (one data bit period is 2.4 ms).
To log the current CEC hardware status:
void (*adap_status)(struct cec_adapter *adap, struct seq_file *file);
This optional callback can be used to show the status of the CEC hardware.
The status is available through debugfs: cat /sys/kernel/debug/cec/cecX/status
Your adapter driver will also have to react to events (typically interrupt
driven) by calling into the framework in the following situations:
When a transmit finished (successfully or otherwise):
void cec_transmit_done(struct cec_adapter *adap, u8 status, u8 arb_lost_cnt,
u8 nack_cnt, u8 low_drive_cnt, u8 error_cnt);
The status can be one of:
CEC_TX_STATUS_OK: the transmit was successful.
CEC_TX_STATUS_ARB_LOST: arbitration was lost: another CEC initiator
took control of the CEC line and you lost the arbitration.
CEC_TX_STATUS_NACK: the message was nacked (for a directed message) or
acked (for a broadcast message). A retransmission is needed.
CEC_TX_STATUS_LOW_DRIVE: low drive was detected on the CEC bus. This
indicates that a follower detected an error on the bus and requested a
retransmission.
CEC_TX_STATUS_ERROR: some unspecified error occurred: this can be one of
the previous two if the hardware cannot differentiate or something else
entirely.
CEC_TX_STATUS_MAX_RETRIES: could not transmit the message after
trying multiple times. Should only be set by the driver if it has hardware
support for retrying messages. If set, then the framework assumes that it
doesn't have to make another attempt to transmit the message since the
hardware did that already.
The *_cnt arguments are the number of error conditions that were seen.
This may be 0 if no information is available. Drivers that do not support
hardware retry can just set the counter corresponding to the transmit error
to 1, if the hardware does support retry then either set these counters to
0 if the hardware provides no feedback of which errors occurred and how many
times, or fill in the correct values as reported by the hardware.
When a CEC message was received:
void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg);
Speaks for itself.
Implementing the High-Level CEC Adapter
---------------------------------------
The low-level operations drive the hardware, the high-level operations are
CEC protocol driven. The following high-level callbacks are available:
struct cec_adap_ops {
/* Low-level callbacks */
...
/* High-level CEC message callback */
int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
};
The received() callback allows the driver to optionally handle a newly
received CEC message
int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
If the driver wants to process a CEC message, then it can implement this
callback. If it doesn't want to handle this message, then it should return
-ENOMSG, otherwise the CEC framework assumes it processed this message and
it will not no anything with it.
CEC framework functions
-----------------------
CEC Adapter drivers can call the following CEC framework functions:
int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
bool block);
Transmit a CEC message. If block is true, then wait until the message has been
transmitted, otherwise just queue it and return.
void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block);
Change the physical address. This function will set adap->phys_addr and
send an event if it has changed. If cec_s_log_addrs() has been called and
the physical address has become valid, then the CEC framework will start
claiming the logical addresses. If block is true, then this function won't
return until this process has finished.
When the physical address is set to a valid value the CEC adapter will
be enabled (see the adap_enable op). When it is set to CEC_PHYS_ADDR_INVALID,
then the CEC adapter will be disabled. If you change a valid physical address
to another valid physical address, then this function will first set the
address to CEC_PHYS_ADDR_INVALID before enabling the new physical address.
int cec_s_log_addrs(struct cec_adapter *adap,
struct cec_log_addrs *log_addrs, bool block);
Claim the CEC logical addresses. Should never be called if CEC_CAP_LOG_ADDRS
is set. If block is true, then wait until the logical addresses have been
claimed, otherwise just queue it and return. To unconfigure all logical
addresses call this function with log_addrs set to NULL or with
log_addrs->num_log_addrs set to 0. The block argument is ignored when
unconfiguring. This function will just return if the physical address is
invalid. Once the physical address becomes valid, then the framework will
attempt to claim these logical addresses.

31
Documentation/devicetree/bindings/media/s5p-cec.txt Normal file
View File

@@ -0,0 +1,31 @@
* Samsung HDMI CEC driver
The HDMI CEC module is present is Samsung SoCs and its purpose is to
handle communication between HDMI connected devices over the CEC bus.
Required properties:
- compatible : value should be following
"samsung,s5p-cec"
- reg : Physical base address of the IP registers and length of memory
mapped region.
- interrupts : HDMI CEC interrupt number to the CPU.
- clocks : from common clock binding: handle to HDMI CEC clock.
- clock-names : from common clock binding: must contain "hdmicec",
corresponding to entry in the clocks property.
- samsung,syscon-phandle - phandle to the PMU system controller
Example:
hdmicec: cec@100B0000 {
compatible = "samsung,s5p-cec";
reg = <0x100B0000 0x200>;
interrupts = <0 114 0>;
clocks = <&clock CLK_HDMI_CEC>;
clock-names = "hdmicec";
samsung,syscon-phandle = <&pmu_system_controller>;
pinctrl-names = "default";
pinctrl-0 = <&hdmi_cec>;
status = "okay";
};

36
Documentation/video4linux/vivid.txt
View File

@@ -74,7 +74,8 @@ Section 11: Cropping, Composing, Scaling
Section 12: Formats
Section 13: Capture Overlay
Section 14: Output Overlay
Section 15: Some Future Improvements
Section 15: CEC (Consumer Electronics Control)
Section 16: Some Future Improvements
Section 1: Configuring the driver
@@ -364,7 +365,11 @@ For HDMI inputs it is possible to set the EDID. By default a simple EDID
is provided. You can only set the EDID for HDMI inputs. Internally, however,
the EDID is shared between all HDMI inputs.
No interpretation is done of the EDID data.
No interpretation is done of the EDID data with the exception of the
physical address. See the CEC section for more details.
There is a maximum of 15 HDMI inputs (if there are more, then they will be
reduced to 15) since that's the limitation of the EDID physical address.
Section 3: Video Output
@@ -409,6 +414,9 @@ standard, and for all others a 1:1 pixel aspect ratio is returned.
An HDMI output has a valid EDID which can be obtained through VIDIOC_G_EDID.
There is a maximum of 15 HDMI outputs (if there are more, then they will be
reduced to 15) since that's the limitation of the EDID physical address. See
also the CEC section for more details.
Section 4: VBI Capture
----------------------
@@ -1108,7 +1116,26 @@ capabilities will slow down the video loop considerably as a lot of checks have
to be done per pixel.
Section 15: Some Future Improvements
Section 15: CEC (Consumer Electronics Control)
----------------------------------------------
If there are HDMI inputs then a CEC adapter will be created that has
the same number of input ports. This is the equivalent of e.g. a TV that
has that number of inputs. Each HDMI output will also create a
CEC adapter that is hooked up to the corresponding input port, or (if there
are more outputs than inputs) is not hooked up at all. In other words,
this is the equivalent of hooking up each output device to an input port of
the TV. Any remaining output devices remain unconnected.
The EDID that each output reads reports a unique CEC physical address that is
based on the physical address of the EDID of the input. So if the EDID of the
receiver has physical address A.B.0.0, then each output will see an EDID
containing physical address A.B.C.0 where C is 1 to the number of inputs. If
there are more outputs than inputs then the remaining outputs have a CEC adapter
that is disabled and reports an invalid physical address.
Section 16: Some Future Improvements
------------------------------------
Just as a reminder and in no particular order:
@@ -1121,8 +1148,6 @@ Just as a reminder and in no particular order:
- Fix sequence/field numbering when looping of video with alternate fields
- Add support for V4L2_CID_BG_COLOR for video outputs
- Add ARGB888 overlay support: better testing of the alpha channel
- Add custom DV timings support
- Add support for V4L2_DV_FL_REDUCED_FPS
- Improve pixel aspect support in the tpg code by passing a real v4l2_fract
- Use per-queue locks and/or per-device locks to improve throughput
- Add support to loop from a specific output to a specific input across
@@ -1133,3 +1158,4 @@ Just as a reminder and in no particular order:
- Make a thread for the RDS generation, that would help in particular for the
"Controls" RDS Rx I/O Mode as the read-only RDS controls could be updated
in real-time.
- Changing the EDID should cause hotplug detect emulation to happen.

23
MAINTAINERS
View File

@@ -1647,6 +1647,13 @@ L: linux-media@vger.kernel.org
S: Maintained
F: drivers/media/platform/s5p-tv/
ARM/SAMSUNG S5P SERIES HDMI CEC SUBSYSTEM SUPPORT
M: Kyungmin Park <kyungmin.park@samsung.com>
L: linux-arm-kernel@lists.infradead.org
L: linux-media@vger.kernel.org
S: Maintained
F: drivers/staging/media/platform/s5p-cec/
ARM/SAMSUNG S5P SERIES JPEG CODEC SUPPORT
M: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
M: Jacek Anaszewski <j.anaszewski@samsung.com>
@@ -2852,6 +2859,22 @@ F: drivers/net/ieee802154/cc2520.c
F: include/linux/spi/cc2520.h
F: Documentation/devicetree/bindings/net/ieee802154/cc2520.txt
CEC DRIVER
M: Hans Verkuil <hans.verkuil@cisco.com>
L: linux-media@vger.kernel.org
T: git git://linuxtv.org/media_tree.git
W: http://linuxtv.org
S: Supported
F: Documentation/cec.txt
F: Documentation/DocBook/media/v4l/cec*
F: drivers/staging/media/cec/
F: drivers/media/cec-edid.c
F: drivers/media/rc/keymaps/rc-cec.c
F: include/media/cec.h
F: include/media/cec-edid.h
F: include/linux/cec.h
F: include/linux/cec-funcs.h
CELL BROADBAND ENGINE ARCHITECTURE
M: Arnd Bergmann <arnd@arndb.de>
L: linuxppc-dev@lists.ozlabs.org

3
drivers/media/Kconfig
View File

@@ -80,6 +80,9 @@ config MEDIA_RC_SUPPORT
Say Y when you have a TV or an IR device.
config MEDIA_CEC_EDID
tristate
#
# Media controller
# Selectable only for webcam/grabbers, as other drivers don't use it

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