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The Comedi "attach" handler `dt2814_attach()` writes to the Control register to turn off the timer enable 'ENB' bit, which triggers a conversion. It then sleeps awhile and checks the Status register, returning an error if the ERR bit is set. However, the ERR bit could have been set due to the conversion being triggered while the A/D converter was busy (unlikely) or due to the conversion being triggered before some previous sample had been read from the A/D Data register. Replace the existing code with a call to `dt2814_ai_clear()` which waits for any conversion to finish and then clears any unread data or error condition. A non-zero return value from `dt2814_ai_clear()` indicates a time-out while waiting for the A/D converter to become non-busy. Return an error in that case. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20210301165757.243065-4-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.