include/linux/platform_data/ad7879.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* linux/platform_data/ad7879.h */
   3
   4 /* Touchscreen characteristics vary between boards and models.  The
   5  * platform_data for the device's "struct device" holds this information.
   6  *
   7  * It's OK if the min/max values are zero.
   8  */
   9 struct ad7879_platform_data {
  10         u16     model;                  /* 7879 */
  11         u16     x_plate_ohms;
  12         u16     x_min, x_max;
  13         u16     y_min, y_max;
  14         u16     pressure_min, pressure_max;
  15
  16         bool    swap_xy;                /* swap x and y axes */
  17
  18         /* [0..255] 0=OFF Starts at 1=550us and goes
  19          * all the way to 9.440ms in steps of 35us.
  20          */
  21         u8      pen_down_acc_interval;
  22         /* [0..15] Starts at 0=128us and goes all the
  23          * way to 4.096ms in steps of 128us.
  24          */
  25         u8      first_conversion_delay;
  26         /* [0..3] 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */
  27         u8      acquisition_time;
  28         /* [0..3] Average X middle samples 0 = 2, 1 = 4, 2 = 8, 3 = 16 */
  29         u8      averaging;
  30         /* [0..3] Perform X measurements 0 = OFF,
  31          * 1 = 4, 2 = 8, 3 = 16 (median > averaging)
  32          */
  33         u8      median;
  34         /* 1 = AUX/VBAT/GPIO export GPIO to gpiolib
  35          * requires CONFIG_GPIOLIB
  36          */
  37         bool    gpio_export;
  38         /* identifies the first GPIO number handled by this chip;
  39          * or, if negative, requests dynamic ID allocation.
  40          */
  41         s32     gpio_base;
  42 };