Re: [RFC] Reporting "orientation changed" event

[Anisse Astier <anisse@astier.eu>]

On Thu, 07 Apr 2011 18:01:39 +0100, Jonathan Cameron <jic23@cam.ac.uk> wrote :

> On 04/07/11 17:18, Anisse Astier wrote:
> > 
> > Pegatron Lucid tablet sends an ACPI hotkey event(0xEA) when the
> > accelerometer detects coarse orientation change. My initial thought was
> > to just translate this event into KEY_DIRECTION, which seems to be the
> > norm from what we can see in hp-wmi driver. (See patch below for an
> > implementation.)
> > 
> > But this isn't just a key per se like on the HP touchsmart tablet, this
> > is an event that is triggered when the device is rotated.
> > 
> > This could be defined as a new Misc (EV_MSC) event:
> > MSC_ORIENTATION_CHANGED ?
> > 
> > Or we could use the upcoming IIO subsystem which is supposed to be for
> > sensors, but then we'd have a mismatch between the device based on ACPI
> > with firmware in the middle (driver submitted by Andy Ross) and the
> > purpose of IIO ("SPI or I2C device").
> Don't take that too literally. It's examples of types of bus IIO sensors use.
> Having said this, if your main use is user input then it should probably be
> handled through input rather than IIO anyway.
> 

Indeed, main use is user input. There's also the BIOS translation layer
to ACPI, so I guess it's a bit distant from IIO's purpose.


Anisse