On Thu, 9 Sep 2021 16:05:41 +0300 Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote: > On Thu, Sep 09, 2021 at 11:45:37AM +0200, Jacopo Mondi wrote: > > Document the 'in_concentration_co2_scale' standard IIO attribute. > > ... > > > +What: /sys/bus/iio/devices/iio:deviceX/in_concentration_co2_scale > > I don't know the history of the discussion about this attribute but it seems > too specific to have in list of kinda generic ones. > > Shouldn't be rather air / gas / etc used instead of CO2? > I'm not following. The sensor is measuring c02 concentration (in the air) so we need to call that out. Making it more general would mean we couldn't then handle a sensor that had channels for c02 and oxygen for example. We don't bother to distinguish the difference between concentration in gas or liquid because it seemed unneeded. This is sort of similar to the fact we don't distinguish gas temperature (say in a humidity sensor) from object temperature in an IR thermometer. We could do so if there is a strong reason for it. Using c02 as a modifier on a concentration channel is in line with how we handled things like different light frequency ranges ir, visible, red, green, blue. Jonathan
