Messages in this thread | | | Subject | Re: Reporting screen/laptop orientation data to userspace | From | Bastien Nocera <> | Date | Fri, 03 Jun 2011 16:55:28 +0100 |
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On Sun, 2011-05-29 at 10:49 +0300, Alberto Mardegan wrote: > Hi all, > the WMI interfaces in some Lenovo Ideapad laptops provide notification > callbacks when the laptop orientation changes, reporting 4 different > values defining the new orientation. > > I'd like to extend the ideapad-laptop driver with this information; but > how should it be reported to userspace? I initially thought of the input > subsystem, but I cannot find any suitable event codes; then I would > probably export it as a device under /sys, or are there better options? > > Are there other devices which provide coarse orientation data to > userspace, which I might want to use as a reference? > I guess that at least some display screens have this feature.
Do you also have a discrete accelerometer with that? Or you only ever get notification through there?
If there is a discrete accelerometer, I'd drop the extra metadata, and send an event through udev, and expect user-space to read from the accelerometer instead.
If there isn't a discrete accelerometer, create a fake one, with some hardcoded data based on the actual orientation of the device.
The accelerometer (whether real or fake) should show 3 axis (X/Y/Z).
As soon as it's seen some testing, I'll be showing the work I did for GNOME support for automatic rotation based on orientation.
Cheers
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