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Diffstat (limited to 'Documentation/media/uapi/rc/lirc-write.rst')
| -rw-r--r-- | Documentation/media/uapi/rc/lirc-write.rst | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/Documentation/media/uapi/rc/lirc-write.rst b/Documentation/media/uapi/rc/lirc-write.rst index 3b035c6613b1..2aad0fef4a5b 100644 --- a/Documentation/media/uapi/rc/lirc-write.rst +++ b/Documentation/media/uapi/rc/lirc-write.rst @@ -42,13 +42,16 @@ Description referenced by the file descriptor ``fd`` from the buffer starting at ``buf``. -The data written to the chardev is a pulse/space sequence of integer -values. Pulses and spaces are only marked implicitly by their position. -The data must start and end with a pulse, therefore, the data must -always include an uneven number of samples. The write function must -block until the data has been transmitted by the hardware. If more data -is provided than the hardware can send, the driver returns ``EINVAL``. - +The exact format of the data depends on what mode a driver uses, use +:ref:`lirc_get_features` to get the supported mode. + +When in :ref:`LIRC_MODE_PULSE <lirc-mode-PULSE>` mode, the data written to +the chardev is a pulse/space sequence of integer values. Pulses and spaces +are only marked implicitly by their position. The data must start and end +with a pulse, therefore, the data must always include an uneven number of +samples. The write function must block until the data has been transmitted +by the hardware. If more data is provided than the hardware can send, the +driver returns ``EINVAL``. Return Value ============ |