> > I'm working on a iio driver for the DHT11 (and DHT22) > > humidity and temperature sensor. I believe this is the > > first humidity sensor to be supported by the iio framework. > Sure, previously these have been considered acceptable to hwmon > (just about ;). That has always been controversial and with > iio-hwmon in place, I doubt anyone will mind having it new > ones in IIO. I've cc'd a few people just in case they have > strong views on this. Thanks for the pointer. Obviously I should have researched that better. I didn't look into this in detail yet, but porting the driver to hwmon probably isn't much more work than adding humidity support to IIO. Which way do you prefer? > > This poses the question how the iio API regarding humidity > > values should be extended. > > > > 1) Which string to use to construct filenames in sysfs, etc.: > > My suggestion: "relhum" > I wonder if humidtyrelative would be better (just in case someone > produces a sensor to measure specific or absolute humidity as then > they will be close together in names. Also it's rarely worth > abreviating these terms as it can only cause confusion at a later > date and only costs a few characters here and there. hwmon is using "humidity" it seems. Now I'm torn between using the same and "humidityrelative" ;) > > 2) What unit to use for values: > > My suggestion: permil (0.1%) > hmm.. Interesting question for a ratio quantity. Perhaps a > decimal ratio might work? so 0.1% = 0.0001? > Don't really have strong feelings but permil whilst common > in some fields is a little unusual. hwmon is using milli per cent units. I suggest following that precedent. > > I'll submit a formal patch for the DHT11 driver when the > > iio framework is ready, but if you want to have a look at > > the work in progress, you find it at > > http://www.unet.univie.ac.at/~a0300802/files/dht11-gpio.c > > and at the bottom of this mail. [...] > Have had a very quick look at the driver and looks fine in general. > Will do a full review once it is complete. Thanks for the feedback. Harald -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
