diff options
Diffstat (limited to 'Documentation/media/uapi/cec/cec-ioc-receive.rst')
| -rw-r--r-- | Documentation/media/uapi/cec/cec-ioc-receive.rst | 114 |
1 files changed, 57 insertions, 57 deletions
diff --git a/Documentation/media/uapi/cec/cec-ioc-receive.rst b/Documentation/media/uapi/cec/cec-ioc-receive.rst index 2bc2d60..47aadcd 100644 --- a/Documentation/media/uapi/cec/cec-ioc-receive.rst +++ b/Documentation/media/uapi/cec/cec-ioc-receive.rst @@ -33,8 +33,8 @@ Arguments Description =========== -Note: this documents the proposed CEC API. This API is not yet finalized -and is currently only available as a staging kernel module. +.. note:: This documents the proposed CEC API. This API is not yet finalized + and is currently only available as a staging kernel module. To receive a CEC message the application has to fill in the :c:type:`struct cec_msg` structure and pass it to the :ref:`CEC_RECEIVE` @@ -67,8 +67,8 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``ts`` - Timestamp of when the message was transmitted in ns in the case of - :ref:`CEC_TRANSMIT` with ``reply`` set to 0, or the timestamp of the - received message in all other cases. + :ref:`CEC_TRANSMIT` with ``reply`` set to 0, or the timestamp of the + received message in all other cases. - .. row 2 @@ -77,9 +77,9 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``len`` - The length of the message. For :ref:`CEC_TRANSMIT` this is filled in - by the application. The driver will fill this in for - :ref:`CEC_RECEIVE` and for :ref:`CEC_TRANSMIT` it will be filled in with - the length of the reply message if ``reply`` was set. + by the application. The driver will fill this in for + :ref:`CEC_RECEIVE` and for :ref:`CEC_TRANSMIT` it will be filled in with + the length of the reply message if ``reply`` was set. - .. row 3 @@ -88,11 +88,11 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``timeout`` - 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 - :ref:`CEC_RECEIVE`. If it is 0 and it is called by :ref:`CEC_TRANSMIT`, - then it will be replaced by 1000 if the ``reply`` is non-zero or - ignored if ``reply`` is 0. + 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 + :ref:`CEC_RECEIVE`. If it is 0 and it is called by :ref:`CEC_TRANSMIT`, + then it will be replaced by 1000 if the ``reply`` is non-zero or + ignored if ``reply`` is 0. - .. row 4 @@ -101,9 +101,9 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``sequence`` - 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. + 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. - .. row 5 @@ -120,10 +120,10 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``rx_status`` - The status bits of the received message. See - :ref:`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 ``rx_status`` - and ``tx_status`` are set. + :ref:`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 ``rx_status`` + and ``tx_status`` are set. - .. row 7 @@ -132,8 +132,8 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``tx_status`` - The status bits of the transmitted message. See - :ref:`cec-tx-status` for the possible status values. It is 0 if - this messages was received, not transmitted. + :ref:`cec-tx-status` for the possible status values. It is 0 if + this messages was received, not transmitted. - .. row 8 @@ -142,9 +142,9 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``msg``\ [16] - The message payload. For :ref:`CEC_TRANSMIT` this is filled in by the - application. The driver will fill this in for :ref:`CEC_RECEIVE` and - for :ref:`CEC_TRANSMIT` it will be filled in with the payload of the - reply message if ``reply`` was set. + application. The driver will fill this in for :ref:`CEC_RECEIVE` and + for :ref:`CEC_TRANSMIT` it will be filled in with the payload of the + reply message if ``reply`` was set. - .. row 9 @@ -153,15 +153,15 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``reply`` - Wait until this message is replied. If ``reply`` is 0 and the - ``timeout`` 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 ``tx_status`` field, then ``reply`` and ``timeout`` are - both set to 0 by the driver. Ignored by :ref:`CEC_RECEIVE`. The case - where ``reply`` is 0 (this is the opcode for the Feature Abort - message) and ``timeout`` is non-zero is specifically allowed to - send a message and wait up to ``timeout`` milliseconds for a - Feature Abort reply. In this case ``rx_status`` will either be set - to :ref:`CEC_RX_STATUS_TIMEOUT <CEC-RX-STATUS-TIMEOUT>` or :ref:`CEC_RX_STATUS-FEATURE-ABORT <CEC-RX-STATUS-FEATURE-ABORT>`. + ``timeout`` 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 ``tx_status`` field, then ``reply`` and ``timeout`` are + both set to 0 by the driver. Ignored by :ref:`CEC_RECEIVE`. The case + where ``reply`` is 0 (this is the opcode for the Feature Abort + message) and ``timeout`` is non-zero is specifically allowed to + send a message and wait up to ``timeout`` milliseconds for a + Feature Abort reply. In this case ``rx_status`` will either be set + to :ref:`CEC_RX_STATUS_TIMEOUT <CEC-RX-STATUS-TIMEOUT>` or :ref:`CEC_RX_STATUS-FEATURE-ABORT <CEC-RX-STATUS-FEATURE-ABORT>`. - .. row 10 @@ -170,9 +170,9 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``tx_arb_lost_cnt`` - 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 - :ref:`CEC_TX_STATUS_ARB_LOST <CEC-TX-STATUS-ARB-LOST>` status bit is set. + Arbitration Lost error. This is only set if the hardware supports + this, otherwise it is always 0. This counter is only valid if the + :ref:`CEC_TX_STATUS_ARB_LOST <CEC-TX-STATUS-ARB-LOST>` status bit is set. - .. row 11 @@ -181,9 +181,9 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``tx_nack_cnt`` - 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 - :ref:`CEC_TX_STATUS_NACK <CEC-TX-STATUS-NACK>` status bit is set. + Not Acknowledged error. This is only set if the hardware supports + this, otherwise it is always 0. This counter is only valid if the + :ref:`CEC_TX_STATUS_NACK <CEC-TX-STATUS-NACK>` status bit is set. - .. row 12 @@ -192,9 +192,9 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``tx_low_drive_cnt`` - 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 - :ref:`CEC_TX_STATUS_LOW_DRIVE <CEC-TX-STATUS-LOW-DRIVE>` status bit is set. + Arbitration Lost error. This is only set if the hardware supports + this, otherwise it is always 0. This counter is only valid if the + :ref:`CEC_TX_STATUS_LOW_DRIVE <CEC-TX-STATUS-LOW-DRIVE>` status bit is set. - .. row 13 @@ -203,9 +203,9 @@ queue, then it will return -1 and set errno to the EBUSY error code. - ``tx_error_cnt`` - 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 :ref:`CEC_TX_STATUS_ERROR <CEC-TX-STATUS-ERROR>` status bit is set. + 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 :ref:`CEC_TX_STATUS_ERROR <CEC-TX-STATUS-ERROR>` status bit is set. @@ -224,9 +224,9 @@ queue, then it will return -1 and set errno to the EBUSY error code. - 0x01 - The message was transmitted successfully. This is mutually - exclusive with :ref:`CEC_TX_STATUS_MAX_RETRIES <CEC-TX-STATUS-MAX-RETRIES>`. Other bits can still - be set if earlier attempts met with failure before the transmit - was eventually successful. + exclusive with :ref:`CEC_TX_STATUS_MAX_RETRIES <CEC-TX-STATUS-MAX-RETRIES>`. Other bits can still + be set if earlier attempts met with failure before the transmit + was eventually successful. - .. _`CEC-TX-STATUS-ARB-LOST`: @@ -251,8 +251,8 @@ queue, then it will return -1 and set errno to the EBUSY error code. - 0x08 - Low drive was detected on the CEC bus. This indicates that a - follower detected an error on the bus and requests a - retransmission. + follower detected an error on the bus and requests a + retransmission. - .. _`CEC-TX-STATUS-ERROR`: @@ -261,9 +261,9 @@ queue, then it will return -1 and set errno to the EBUSY error code. - 0x10 - 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. + the previous two, either because the hardware could not tell which + error occurred, or because the hardware tested for other + conditions besides those two. - .. _`CEC-TX-STATUS-MAX-RETRIES`: @@ -272,8 +272,8 @@ queue, then it will return -1 and set errno to the EBUSY error code. - 0x20 - The transmit failed after one or more retries. This status bit is - mutually exclusive with :ref:`CEC_TX_STATUS_OK <CEC-TX-STATUS-OK>`. Other bits can still - be set to explain which failures were seen. + mutually exclusive with :ref:`CEC_TX_STATUS_OK <CEC-TX-STATUS-OK>`. Other bits can still + be set to explain which failures were seen. @@ -308,8 +308,8 @@ queue, then it will return -1 and set errno to the EBUSY error code. - 0x04 - The message was received successfully but the reply was - ``CEC_MSG_FEATURE_ABORT``. This status is only set if this message - was the reply to an earlier transmitted message. + ``CEC_MSG_FEATURE_ABORT``. This status is only set if this message + was the reply to an earlier transmitted message. |
