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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _CEC_MODE:
+.. _CEC_G_MODE:
+.. _CEC_S_MODE:
+
+********************************
+ioctls CEC_G_MODE and CEC_S_MODE
+********************************
+
+CEC_G_MODE, CEC_S_MODE - Get or set exclusive use of the CEC adapter
+
+Synopsis
+========
+
+.. cpp:function:: int ioctl( int fd, int request, __u32 *argp )
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by :ref:`open() <cec-func-open>`.
+
+``request``
+    CEC_G_MODE, CEC_S_MODE
+
+``argp``
+
+
+Description
+===========
+
+.. note:: This documents the proposed CEC API. This API is not yet finalized
+   and is currently only available as a staging kernel module.
+
+By default any filehandle can use :ref:`CEC_TRANSMIT`, 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.
+
+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.
+
+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 :ref:`ioctl CEC_RECEIVE <CEC_RECEIVE>` to dequeue
+the new message. The framework expects the follower to make the right
+decisions.
+
+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 :ref:`cec-core-processing` for details.
+
+If there is no initiator, then any CEC filehandle can use
+:ref:`ioctl CEC_TRANSMIT <CEC_TRANSMIT>`. If there is an exclusive
+initiator then only that initiator can call
+:ref:`CEC_TRANSMIT`. The follower can of course
+always call :ref:`ioctl CEC_TRANSMIT <CEC_TRANSMIT>`.
+
+Available initiator modes are:
+
+
+.. _cec-mode-initiator_e:
+
+.. flat-table:: Initiator Modes
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       3 1 16
+
+
+    -  .. _`CEC-MODE-NO-INITIATOR`:
+
+       -  ``CEC_MODE_NO_INITIATOR``
+
+       -  0x0
+
+       -  This is not an initiator, i.e. it cannot transmit CEC messages or
+	  make any other changes to the CEC adapter.
+
+    -  .. _`CEC-MODE-INITIATOR`:
+
+       -  ``CEC_MODE_INITIATOR``
+
+       -  0x1
+
+       -  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.
+
+    -  .. _`CEC-MODE-EXCL-INITIATOR`:
+
+       -  ``CEC_MODE_EXCL_INITIATOR``
+
+       -  0x2
+
+       -  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 code
+	  error.
+
+
+Available follower modes are:
+
+
+.. _cec-mode-follower_e:
+
+.. flat-table:: Follower Modes
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       3 1 16
+
+
+    -  .. _`CEC-MODE-NO-FOLLOWER`:
+
+       -  ``CEC_MODE_NO_FOLLOWER``
+
+       -  0x00
+
+       -  This is not a follower (the default when the device is opened).
+
+    -  .. _`CEC-MODE-FOLLOWER`:
+
+       -  ``CEC_MODE_FOLLOWER``
+
+       -  0x10
+
+       -  This is a follower and it will receive CEC messages unless there
+	  is an exclusive follower. You cannot become a follower if
+	  :ref:`CEC_CAP_TRANSMIT <CEC-CAP-TRANSMIT>` is not set or if :ref:`CEC_MODE_NO_INITIATOR <CEC-MODE-NO-INITIATOR>`
+	  was specified, the ``EINVAL`` error code is returned in that case.
+
+    -  .. _`CEC-MODE-EXCL-FOLLOWER`:
+
+       -  ``CEC_MODE_EXCL_FOLLOWER``
+
+       -  0x20
+
+       -  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 code. You cannot become a follower if
+	  :ref:`CEC_CAP_TRANSMIT <CEC-CAP-TRANSMIT>` is not set or if :ref:`CEC_MODE_NO_INITIATOR <CEC-MODE-NO-INITIATOR>`
+	  was specified, the ``EINVAL`` error code is returned in that case.
+
+    -  .. _`CEC-MODE-EXCL-FOLLOWER-PASSTHRU`:
+
+       -  ``CEC_MODE_EXCL_FOLLOWER_PASSTHRU``
+
+       -  0x30
+
+       -  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
+	  code. You cannot become a follower if :ref:`CEC_CAP_TRANSMIT <CEC-CAP-TRANSMIT>`
+	  is not set or if :ref:`CEC_MODE_NO_INITIATOR <CEC-MODE-NO-INITIATOR>` was specified,
+	  the ``EINVAL`` error code is returned in that case.
+
+    -  .. _`CEC-MODE-MONITOR`:
+
+       -  ``CEC_MODE_MONITOR``
+
+       -  0xe0
+
+       -  Put the file descriptor into monitor mode. Can only be used in
+	  combination with :ref:`CEC_MODE_NO_INITIATOR <CEC-MODE-NO-INITIATOR>`, otherwise EINVAL error
+	  code 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 ``CAP_NET_ADMIN`` capability. If
+	  that is not set, then the ``EPERM`` error code is returned.
+
+    -  .. _`CEC-MODE-MONITOR-ALL`:
+
+       -  ``CEC_MODE_MONITOR_ALL``
+
+       -  0xf0
+
+       -  Put the file descriptor into 'monitor all' mode. Can only be used
+	  in combination with :ref:`CEC_MODE_NO_INITIATOR <CEC-MODE-NO-INITIATOR>`, otherwise
+	  the ``EINVAL`` error code 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 :ref:`CEC_CAP_MONITOR_ALL <CEC-CAP-MONITOR-ALL>` capability is set,
+	  otherwise the ``EINVAL`` error code is returned. This is only allowed if
+	  the process has the ``CAP_NET_ADMIN`` capability. If that is not
+	  set, then the ``EPERM`` error code is returned.
+
+
+Core message processing details:
+
+
+.. _cec-core-processing:
+
+.. flat-table:: Core Message Processing
+    :header-rows:  0
+    :stub-columns: 0
+    :widths: 1 8
+
+
+    -  .. _`CEC-MSG-GET-CEC-VERSION`:
+
+       -  ``CEC_MSG_GET_CEC_VERSION``
+
+       -  When in passthrough mode this message has to be handled by
+	  userspace, otherwise the core will return the CEC version that was
+	  set with :ref:`ioctl CEC_ADAP_S_LOG_ADDRS <CEC_ADAP_S_LOG_ADDRS>`.
+
+    -  .. _`CEC-MSG-GIVE-DEVICE-VENDOR-ID`:
+
+       -  ``CEC_MSG_GIVE_DEVICE_VENDOR_ID``
+
+       -  When in passthrough mode this message has to be handled by
+	  userspace, otherwise the core will return the vendor ID that was
+	  set with :ref:`ioctl CEC_ADAP_S_LOG_ADDRS <CEC_ADAP_S_LOG_ADDRS>`.
+
+    -  .. _`CEC-MSG-ABORT`:
+
+       -  ``CEC_MSG_ABORT``
+
+       -  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.
+
+    -  .. _`CEC-MSG-GIVE-PHYSICAL-ADDR`:
+
+       -  ``CEC_MSG_GIVE_PHYSICAL_ADDR``
+
+       -  When in passthrough mode this message has to be handled by
+	  userspace, otherwise the core will report the current physical
+	  address.
+
+    -  .. _`CEC-MSG-GIVE-OSD-NAME`:
+
+       -  ``CEC_MSG_GIVE_OSD_NAME``
+
+       -  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 :ref:`ioctl CEC_ADAP_S_LOG_ADDRS <CEC_ADAP_S_LOG_ADDRS>`.
+
+    -  .. _`CEC-MSG-GIVE-FEATURES`:
+
+       -  ``CEC_MSG_GIVE_FEATURES``
+
+       -  When in passthrough mode this message has to be handled by
+	  userspace, otherwise the core will report the current features as
+	  was set with :ref:`ioctl CEC_ADAP_S_LOG_ADDRS <CEC_ADAP_S_LOG_ADDRS>`
+	  or the message is ignored if the CEC version was older than 2.0.
+
+    -  .. _`CEC-MSG-USER-CONTROL-PRESSED`:
+
+       -  ``CEC_MSG_USER_CONTROL_PRESSED``
+
+       -  If :ref:`CEC_CAP_RC <CEC-CAP-RC>` is set, then generate a remote control key
+	  press. This message is always passed on to userspace.
+
+    -  .. _`CEC-MSG-USER-CONTROL-RELEASED`:
+
+       -  ``CEC_MSG_USER_CONTROL_RELEASED``
+
+       -  If :ref:`CEC_CAP_RC <CEC-CAP-RC>` is set, then generate a remote control key
+	  release. This message is always passed on to userspace.
+
+    -  .. _`CEC-MSG-REPORT-PHYSICAL-ADDR`:
+
+       -  ``CEC_MSG_REPORT_PHYSICAL_ADDR``
+
+       -  The CEC framework will make note of the reported physical address
+	  and then just pass the message on to userspace.
+
+
+
+Return Value
+============
+
+On success 0 is returned, on error -1 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.