linux-kernel - Re: [PATCH RFC 0/4] iio: add support for multiple scan types

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Date: Tue, 21 May 2024 11:18:24 +0200
From: Nuno Sá <noname.nuno@...il.com>
To: David Lechner <dlechner@...libre.com>, Jonathan Cameron
 <jic23@...nel.org>
Cc: Michael Hennerich <Michael.Hennerich@...log.com>, Nuno
 Sá <nuno.sa@...log.com>, Julien Stephan
 <jstephan@...libre.com>, Esteban Blanc <eblanc@...libre.com>,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 0/4] iio: add support for multiple scan types

On Tue, 2024-05-07 at 14:02 -0500, David Lechner wrote:
> Following up from this thread [1]...
> 
> Unless I've overlooked something important, I think adding support for
> multiple scan types per channels should be rather trivial, at least in
> the kernel. Userspace tools will need to learn to re-read buffer _type
> attributes though. For example, it looks like libiio caches these values.
> I had to restart iiod to get a proper capture with the iio-oscilloscope
> after changing the scan type at runtime.

No for now but to add more future fun, we may consider in having something
similar as hwmon [1]. Hence, userspace could do things like poll(2) on the
specific file rather than having to read it over and over...

[1]: https://elixir.bootlin.com/linux/latest/source/drivers/hwmon/hwmon.c#L649
- Nuno Sá