text: /* 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,*/
  };
  