Input: ads7846 - improve filtering for thumb press accuracy
Providing more accurate coordinates for thumb press requires additional
steps in the filtering logic:
- Ignore samples found invalid by the debouncing logic, or the ones that
have out of bound pressure value.
- Add a parameter to repeat debouncing, so that more then two consecutive
good readings are required for a valid sample.
Signed-off-by: Imre Deak <imre.deak@nokia.com>
Acked-by: Juha Yrjola <juha.yrjola@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h
index d8823e2..adb3dafd 100644
--- a/include/linux/spi/ads7846.h
+++ b/include/linux/spi/ads7846.h
@@ -15,9 +15,11 @@
u16 y_min, y_max;
u16 pressure_min, pressure_max;
- u16 debounce_max; /* max number of readings per sample */
+ u16 debounce_max; /* max number of additional readings
+ * per sample */
u16 debounce_tol; /* tolerance used for filtering */
-
+ u16 debounce_rep; /* additional consecutive good readings
+ * required after the first two */
int (*get_pendown_state)(void);
};