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  */
   8 struct 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         /* [0..255] 0=OFF Starts at 1=550us and goes
  16          * all the way to 9.440ms in steps of 35us.
  17          */
  18         u8      pen_down_acc_interval;
  19         /* [0..15] Starts at 0=128us and goes all the
  20          * way to 4.096ms in steps of 128us.
  21          */
  22         u8      first_conversion_delay;
  23         /* [0..3] 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */
  24         u8      acquisition_time;
  25         /* [0..3] Average X middle samples 0 = 2, 1 = 4, 2 = 8, 3 = 16 */
  26         u8      averaging;
  27         /* [0..3] Perform X measurements 0 = OFF,
  28          * 1 = 4, 2 = 8, 3 = 16 (median > averaging)
  29          */
  30         u8      median;
  31         /* 1 = AUX/VBAT/GPIO export GPIO to gpiolib
  32          * requires CONFIG_GPIOLIB
  33          */
  34         bool    gpio_export;
  35         /* identifies the first GPIO number handled by this chip;
  36          * or, if negative, requests dynamic ID allocation.
  37          */
  38         s32     gpio_base;
  39 };