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3 commits

Author SHA1 Message Date
Amaury Pouly
0324bf59a8 imx233: make button-lradc drive able to handle VDDIO derived values 
In most devices, the button ladder is not actually derived from VDDIO but
from a constant voltage source, making it very easy to read it. However on
some devices like ther ZEN X-Fi Style, the ladder is wired to VDDIO we
can be changed so it's crucial that the button driver correctly scales the
values wrt VDDIO.

Change-Id: Ifc11abe2838fa7d16d0d60ecd96964a8dc5ea6d7
 2014-02-10 23:14:25 +01:00
Amaury Pouly
5909438193 imx233: improve button lradc driver 
The driver can now handle HOLD in several ways, including using a GPIO.
Also add a debug routine to read the raw value of the adc.

Change-Id: Ide2cb1ac58e759b4bc464e606b432f2c150ee36f
 2013-09-25 14:31:39 +02:00
Amaury Pouly
277d358eda imx233: add generic lradc based button driver 
This driver does debouncing and best lradc usage and only requires
a sorted table of values to work, this factoring code as much as
possible.

Change-Id: I84b46f4b08094634e1c5deb5ca9ba20763389e66
 2013-06-18 16:43:27 +02:00