laptop/presentation/tablet mode switch

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Hi,

Sony Vaio Fit 11a/13a/14a/15a laptops have three different screen
orientations: laptop (normal), presentation (screen is 180 degrees
rotated) and tablet (screen rotation should be defined by
accelerometer data).
There is a SW_TABLET_MODE binary switch for laptop/tablet
transformation, but nothing like it for presentation mode.

I would to ask for you recommendations on how to implement
presentation mode event reporting
 - as a new SW_PRESENTATION_MODE switch and make drivers set values
for both switches
 - as a single (new or existing) hotkey code and an entry in sysfs
with screen mode value. plus support for original SW_TABLET_MODE
switch
 - as a new hotkey codes for all three modes plus support for original
SW_TABLET_MODE switch
 - as a new ABS type event plus support for original SW_TABLET_MODE switch
 - some better way to do it

Thank you,
Alexander.
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