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

1 files changed, 11 insertions, 0 deletions

diff --git a/firmware/target/arm/imx233/creative-zen/button-target.h b/firmware/target/arm/imx233/creative-zen/button-target.h
index 65521d66e4..e9a3ac5ab7 100644
--- a/firmware/target/arm/imx233/creative-zen/button-target.h
+++ b/firmware/target/arm/imx233/creative-zen/button-target.h
@@ -25,11 +25,22 @@
 
 bool button_debug_screen(void);
 
+/* HOLD button */
 #if !defined(CREATIVE_ZENXFISTYLE)
 #define HAS_BUTTON_HOLD
 #define IMX233_BUTTON_LRADC_HOLD_DET BLH_ADC
 #endif
 
+/* VDDIO value */
+#if defined(CREATIVE_ZENXFISTYLE)
+#define IMX233_BUTTON_LRADC_VDDIO   3660
+#elif defined(CREATIVE_ZEN)
+#define IMX233_BUTTON_LRADC_VDDIO   3480
+#elif defined(CREATIVE_ZENXFI)
+#define IMX233_BUTTON_LRADC_VDDIO   3500
+#endif
+
+/* LRADC channel */
 #if defined(CREATIVE_ZENXFISTYLE)
 #define IMX233_BUTTON_LRADC_CHANNEL 2
 #else