root/include/linux/spi/ad7877.h

/* linux/spi/ad7877.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.
 */
struct ad7877_platform_data {
        u16     model;                  /* 7877 */
        u16     vref_delay_usecs;       /* 0 for external vref; etc */
        u16     x_plate_ohms;
        u16     y_plate_ohms;

        u16     x_min, x_max;
        u16     y_min, y_max;
        u16     pressure_min, pressure_max;

        u8      stopacq_polarity;       /* 1 = Active HIGH, 0 = Active LOW */
        u8      first_conversion_delay; /* 0 = 0.5us, 1 = 128us, 2 = 1ms, 3 = 8ms */
        u8      acquisition_time;       /* 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */
        u8      averaging;              /* 0 = 1, 1 = 4, 2 = 8, 3 = 16 */
        u8      pen_down_acc_interval;  /* 0 = covert once, 1 = every 0.5 ms,
                                           2 = ever 1 ms,   3 = every 8 ms,*/
};