u16 debounce_tol; /* tolerance used for filtering */
u16 debounce_rep; /* additional consecutive good readings
* required after the first two */
+ int gpio_pendown; /* the GPIO used to decide the pendown
+ * state if get_pendown_state == NULL
+ */
int (*get_pendown_state)(void);
int (*filter_init) (struct ads7846_platform_data *pdata,
void **filter_data);