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SubjectRe: [spi-devel-general] Accelerometer, Gyros and ADC's etc within the kernel.
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


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