Hi David, > On Tuesday 20 May 2008, Jean Delvare wrote: >> This all sounds quite different from our hwmon drivers. Our hwmon >> drivers read all the sensor values at once and cache the readings for a >> couple seconds, so you can't get an instant reading at any time, and >> they also don't support interrupts in general. > > That's something of an issue when the hardware monitor > triggers alarms though, right? I couldn't figure out > how to get a TMP75 alert out to any userspace code that > would care, to pick one example, even after teaching > the i2c core how to handle SMBus alerts. ;) > > I suppose this just emphasizes the point made by Hans > that we kind of need (industrial) "control" components > (or "data acquisition"?) not just "monitoring" ones. I get the feeling even the name is going to evolve for some time to come, getting broader as and when we add more classes of device. > Such alarms are of course different from the "data > ready" signals of an accelerometer. Whilst this is true, most accelerometers also have "alarm" triggers, for example the ST LIS3L02DQ will raise a pin on configurable conditions such as thresholds and even a double click detector (though I've never tried them!). I suppose we will ideally support this functionality as well. -- Jonathan Cameron
