On Fri, Nov 17, 2023 at 12:22 PM Sicelo <absicsz@xxxxxxxxx> wrote: > > 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 > Since this is really a proximity switch (it is either on or off) rather than measuring a proximity value over a continuous range, it doesn't seem like a good fit for the iio subsystem. If the sensor is on a phone, then it is likely to detect human presence so the input subsystem does seem like the right one for that application. More at https://www.kernel.org/doc/html/latest/driver-api/iio/intro.html
