Interface for setting half-duplex transmitter mode

Interface for setting half-duplex transmitter mode

[Sergey Lapin]

Hi, all!

Is there any interface API for userspace, which I could use
to set RS-485 mode on UART (which suports it via hardware, by setting 1
bit in configuration), which means half-duplex mode with RTS line
toggling. Now I have it hard-coded for appropriate UART,
and seen patch which sets this from platform data, but
is there some API to do it dynamically?

I know I could implement this by ioctl mechanism, but
I need some non-standard ioctl number for that. Is there
some sane way to accomplish my goals? I mean one which be accepted to
mainline?

Thanks a lot,
S.

Re: Interface for setting half-duplex transmitter mode

[Grant Edwards]

On 2008-08-06, Sergey Lapin <slapin@ossfans.org> wrote:

> Is there any interface API for userspace, which I could use to
> set RS-485 mode on UART (which suports it via hardware, by
> setting 1 bit in configuration), which means half-duplex mode
> with RTS line toggling. Now I have it hard-coded for
> appropriate UART, and seen patch which sets this from platform
> data, but is there some API to do it dynamically?

You do realize that there is currently an actyive thread
discussing this, right?

> I know I could implement this by ioctl mechanism, but I need
> some non-standard ioctl number for that. Is there some sane
> way to accomplish my goals? I mean one which be accepted to
> mainline?

You should read the thread where this is being discussed, but
the short answer is that no, there is no standard way to do
this.

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