Hi

Some phones have 1-bit proximity sensors, which simply toggle a GPIO
line to indicate that an object is near or far. Thresholds are set at
hardware level. One such sensor is OSRAM SFH 7741 [1], which is used on
the Nokia N900.

It is currently exported over evdev, emitting the SW_FRONT_PROXIMITY key
code [2].

So the question is: should a new, general purpose iio-gpio driver be
written, that would switch such a proximity sensor to the iio framework?
Or evdev is really the best place to support it?

There are a couple of people who are willing to write such an iio
driver, if iio is the way to go.

Regards,
Sicelo

[1] https://media.digikey.com/pdf/Data%20Sheets/Osram%20PDFs/SFH_7741.pdf
[2] https://elixir.bootlin.com/linux/v6.6.1/source/arch/arm/boot/dts/ti/omap/omap3-n900.dts#L111