Re: Patch for linux-gpib GPIO bitbanging driver

Hi Thomas,
Excellent, thank you. Will apply your patch and test builds on the weekend.
cheers,
-Dave

On Thu, 22 Apr 2021, 13:16 Thomas Klima, <[email protected]> wrote:

> Hi,
>
> congratulations on the newest release of linux-gpib - I love that the
> bitbanging driver is now included in linux-gpib!
>
> Since 2016 i developed a GPIB-shield for the raspberry pi and a
> patch to linux-gpib as driver on my project page (elektronomikon.org).
>
> Marcello helped me with an interrupt-driven design, and his current
> version is much more elegant than mine but is missing two features
> which imho would warrant looking after:
>
> 1, The driver in linux-gpib V4.3.4 is uses the legacy gpio kernel
>    interface which is marked deprecated for some time now. The
>    raspi_gpib driver uses the GPIO descriptor based interface.
> 2, My project includes SN75160/161 driver IC's which need three
>    extra pins and are unused in the upstream driver.
>
> So i added both changes to the upstream version, which yields the
> following file:
>
> https://github.com/elektronomikon/raspi_gpib_driver/blob/master/for_linux-gpib-4.3.4/gpib_bitbang.c
>
> Marcello tested this on his hardware which ran fine.
>
> The use of SN75160/161 is currently en/disabled via a module parameter,
> which i think is an acceptable solution. Aa config file switch would be
> another possibility, but i dont know how to implement this... Any hints
> are appreciated :-)
>
> Patch is attached, please apply.
>
> Greetings,
> Thomas Klima
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