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/* linux/spi/ads7846.h */

/* Touchscreen characteristics vary between boards and models.  The

 * platform_data for the device's "struct device" holds this information.

 *

 * It's OK if the min/max values are zero.

 */

enum ads7846_filter {

        ADS7846_FILTER_OK,

        ADS7846_FILTER_REPEAT,

        ADS7846_FILTER_IGNORE,

};

struct ads7846_platform_data {

        u16     model;                  /* 7843, 7845, 7846. */

        u16     vref_delay_usecs;       /* 0 for external vref; etc */

        int     keep_vref_on:1;         /* set to keep vref on for differential

                                         * measurements as well */

        /* Settling time of the analog signals; a function of Vcc and the

         * capacitance on the X/Y drivers.  If set to non-zero, two samples

         * are taken with settle_delay us apart, and the second one is used.

         * ~150 uSec with 0.01uF caps.

         */

        u16     settle_delay_usecs;

        /* If set to non-zero, after samples are taken this delay is applied

         * and penirq is rechecked, to help avoid false events.  This value

         * is affected by the material used to build the touch layer.

         */

        u16     penirq_recheck_delay_usecs;

        u16     x_plate_ohms;

        u16     y_plate_ohms;

        u16     x_min, x_max;

        u16     y_min, y_max;

        u16     pressure_min, pressure_max;

        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);

        int     (*filter_init)  (struct ads7846_platform_data *pdata,

                                 void **filter_data);

        int     (*filter)       (void *filter_data, int data_idx, int *val);

        void    (*filter_cleanup)(void *filter_data);

};