On Tue, Jun 2, 2015 at 11:28 AM, Jonathan Cameron <jic23@xxxxxxxxxx> wrote: > On 02/06/15 05:35, Matt Ranostay wrote: >> Jonathan, >> >> So I am currently planning on implementing a driver for the Avago >> APDS-9960 that has the typical ALS, RGBC, and proximity sensor >> components. But this part has a gesture function that uses 4 IR >> photodiodes aligned in a grid of UP-DOWN-LEFT-RIGHT that detect IR >> light reflection off an object, and in turn reports back the direction >> a hand or similar would make over the sensor. >> >> Now the data that is reported back is the intensity of each of the 4 >> LEDs (UPLR) which then userspace can compute the velocity, and >> direction of the gesture. My question should some thing like this be >> using 4 IIO_INTENSITY channels or just one 32-bit value and new type >> of IIO_GESTURE? > Interesting device. > > Anyhow, my immediate reaction is that the single 32 bit value is effectively > device specific whereas breaking it up into 4 values makes it more generic. > (just wait for the predictable 8 led version to offer extra LEDs on the diagonals) > > The question that follows is how to make their relative positions / sensitive directions > apparent to userspace? > > I'd go for sensitive direction as the optics of different sensors may give very different > correspondences. > > So we 'could' do it with modifiers but how do we make them generic enough? > How about a a sensitive_direction type infomask element that gives an approximate > pointing vector? (using the read_raw_multi) The latter seems more sane and functional. Would this just tell userspace the orientation that the sensor is mounted on a board? I would assume so since the LEDs are integrated on the sensor IC. > > Other suggestion welcome as I have only been considering this whilst navigating Dublin > airport and a few beers waiting for the plane. > > Jonathan >> >> Datasheet -> https://cdn.sparkfun.com/datasheets/Sensors/Proximity/apds9960.pdf >> >> >> Thanks, >> >> Matt Ranostay >> > -- 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
