5c7dd7acc3
repo: https://github.com/T-head-Semi/linux commit: b1313fe517ca3703119dcc99ef3bbf75ab42bcfb Change-Id: I6cbb35294024ea3a66140e311f4bb705fd7fd626
52 lines
1.3 KiB
ReStructuredText
52 lines
1.3 KiB
ReStructuredText
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. c:namespace:: RC
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.. _lirc_set_transmitter_mask:
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*******************************
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ioctl LIRC_SET_TRANSMITTER_MASK
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*******************************
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Name
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====
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LIRC_SET_TRANSMITTER_MASK - Enables send codes on a given set of transmitters
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Synopsis
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========
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.. c:macro:: LIRC_SET_TRANSMITTER_MASK
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``int ioctl(int fd, LIRC_SET_TRANSMITTER_MASK, __u32 *mask)``
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Arguments
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=========
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``fd``
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File descriptor returned by open().
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``mask``
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Mask with channels to enable tx. Channel 0 is the least significant bit.
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Description
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===========
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Some IR TX devices have multiple output channels, in such case,
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:ref:`LIRC_CAN_SET_TRANSMITTER_MASK <LIRC-CAN-SET-TRANSMITTER-MASK>` is
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returned via :ref:`LIRC_GET_FEATURES` and this ioctl sets what channels will
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send IR codes.
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This ioctl enables the given set of transmitters. The first transmitter is
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encoded by the least significant bit and so on.
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When an invalid bit mask is given, i.e. a bit is set, even though the device
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does not have so many transitters, then this ioctl returns the number of
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available transitters and does nothing otherwise.
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Return Value
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============
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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