linux-kernel - Re: [RFC PATCH v1 7/9] iio: Expand IIO event interface for real-world unit handling

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Message-ID: <20260131185524.1ded8d50@jic23-huawei>
Date: Sat, 31 Jan 2026 18:55:24 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Marcelo Schmitt <marcelo.schmitt1@...il.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 Jonathan.Cameron@...wei.com, nuno.sa@...log.com, andy@...nel.org,
 dlechner@...libre.com
Subject: Re: [RFC PATCH v1 7/9] iio: Expand IIO event interface for
 real-world unit handling

On Sun, 18 Jan 2026 15:21:46 -0300
Marcelo Schmitt <marcelo.schmitt1@...il.com> wrote:

> The IIO event ABI documentation distinguishes between interfaces that
> handle values in device-specific units (_raw) and event interfaces that
> handle values in real-world units (e.g. meters, Joules, lux, etc).
> However, the IIO event code infrastructure had never really implemented the
> bits to distinguish between those two types of interfaces and had always
> presumed events to handle raw device values.
> 
> For most current use cases, assuming events to handle values in device raw
> units is reasonable because it often matches the type of the associated IIO
> channel. There are a few cases where drivers provide events along side
> channels with both _raw and _input interfaces, though. Also, when
Can you list those cases. I thought we'd been keeping an eye out for that
but seems they slipped through!

> real-world values can be mapped back to device configurations, it enables
> drivers to provide event interfaces that are arguably easier to use.
> 
> Expand the IIO events support, enabling IIO drivers to provide event
> interfaces that handle values in real-world units.
> 
> Signed-off-by: Marcelo Schmitt <marcelo.schmitt1@...il.com>