LXR linux/include/linux/spi/ad7879.h

   1/* linux/spi/ad7879.h */
   2
   3/* Touchscreen characteristics vary between boards and models.  The
   4 * platform_data for the device's "struct device" holds this information.
   5 *
   6 * It's OK if the min/max values are zero.
   7 */
   8struct ad7879_platform_data {
   9        u16     model;                  /* 7879 */
  10        u16     x_plate_ohms;
  11        u16     x_min, x_max;
  12        u16     y_min, y_max;
  13        u16     pressure_min, pressure_max;
  14
  15        bool    swap_xy;                /* swap x and y axes */
  16
  17        /* [0..255] 0=OFF Starts at 1=550us and goes
  18         * all the way to 9.440ms in steps of 35us.
  19         */
  20        u8      pen_down_acc_interval;
  21        /* [0..15] Starts at 0=128us and goes all the
  22         * way to 4.096ms in steps of 128us.
  23         */
  24        u8      first_conversion_delay;
  25        /* [0..3] 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */
  26        u8      acquisition_time;
  27        /* [0..3] Average X middle samples 0 = 2, 1 = 4, 2 = 8, 3 = 16 */
  28        u8      averaging;
  29        /* [0..3] Perform X measurements 0 = OFF,
  30         * 1 = 4, 2 = 8, 3 = 16 (median > averaging)
  31         */
  32        u8      median;
  33        /* 1 = AUX/VBAT/GPIO export GPIO to gpiolib
  34         * requires CONFIG_GPIOLIB
  35         */
  36        bool    gpio_export;
  37        /* identifies the first GPIO number handled by this chip;
  38         * or, if negative, requests dynamic ID allocation.
  39         */
  40        s32     gpio_base;
  41};
  42