Re: [PATCH] iio: hid: hid-sensor-accel-3d: Add second ACC sensor support

["Pandruvada, Srinivas" <srinivas.pandruvada@intel.com>]

On Fri, 2017-03-17 at 14:16 +0100, Bastien Nocera wrote:
> On Fri, 2017-03-17 at 02:13 +0000, Pandruvada, Srinivas wrote:
> > 
> > On Thu, 2017-03-16 at 18:20 +0800, Song Hongyan wrote:
> > > 
> > > As accelerometer sensor becomes more and more popular, there are
> > > more
> > > user scenarios have been developed, "Hinge" is a very important
> > > usecase
> > > which needs two accelerometer sensors to calculate the included
> > > angle
> > > of keyboard and screen.
> > > In this case, two accelerometer sensors will be exposed.
> > > Currently,
> > > IIO interface hasn't other way to distinguish two sensors with
> > > same
> > > sensor type, except sensor name. So a new sensor name
> > > "accel_2nd_3d"
> > > is added for secondary accelerometer sensor.
> > 
> > This type of interface will not satisfy all cases. We have some
> > hubs
> > with  many accelerometers attached. Same case is also true even for
> > discrete sensors. So there should be some framework way to expose
> > location of sensors.
> 
> So you're nacking as well?
Yes.

> 
> > 
> > ACPI has special method called _PLD (Physical Device Location),
> > which
> > can  be used to specify location of any device. So we need to be
> > able
> > to export such information to user space. We can add for each
> > sensor
> > the location information.
> > 
> > I can propose some ABI for exporting location information.
> 
> There were patches floating around to do this, but they were never
> finished:
> http://www.spinics.net/lists/linux-acpi/msg51540.html
We need to add some of those element related to sensors to IIO ABI.
I will propose an ABI as Jonathan suggested.

Thanks,
Srinivas