ad7879.h

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/* linux/spi/ad7879.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 ad7879_platform_data {
    u16 model;          /* 7879 */
    u16 x_plate_ohms;
    u16 x_min, x_max;
    u16 y_min, y_max;
    u16 pressure_min, pressure_max;

    bool    swap_xy;        /* swap x and y axes */

    /* [0..255] 0=OFF Starts at 1=550us and goes
     * all the way to 9.440ms in steps of 35us.
     */
    u8  pen_down_acc_interval;
    /* [0..15] Starts at 0=128us and goes all the
     * way to 4.096ms in steps of 128us.
     */
    u8  first_conversion_delay;
    /* [0..3] 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */
    u8  acquisition_time;
    /* [0..3] Average X middle samples 0 = 2, 1 = 4, 2 = 8, 3 = 16 */
    u8  averaging;
    /* [0..3] Perform X measurements 0 = OFF,
     * 1 = 4, 2 = 8, 3 = 16 (median > averaging)
     */
    u8  median;
    /* 1 = AUX/VBAT/GPIO export GPIO to gpiolib
     * requires CONFIG_GPIOLIB
     */
    bool    gpio_export;
    /* identifies the first GPIO number handled by this chip;
     * or, if negative, requests dynamic ID allocation.
     */
    s32 gpio_base;
};