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In 1394 OHCI, the trailer quadlet of descriptor in Asynchronous Receive (AR) request context has timeStamp field, in which the 1394 OHCI controller record the isochronous cycle when the packet arrived. Current implementation of 1394 OHCI controller driver stores the value of field to internal structure as time stamp, while the implementation of FireWire character device doesn't have a field for the time stamp, thus it is not available in user space. The time stamp is convenient to some kind of application in which data from several sources are compared in isochronous cycle unit. This commit implement the new event, fw_cdev_event_request3, with an additional field, tstamp. Link: https://lore.kernel.org/r/20230529113406.986289-5-o-takashi@sakamocchi.jp Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.