linux/spi/ad7877.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /* linux/spi/ad7877.h */
0003
0004 /* Touchscreen characteristics vary between boards and models.  The
0005  * platform_data for the device's "struct device" holds this information.
0006  *
0007  * It's OK if the min/max values are zero.
0008  */
0009 struct ad7877_platform_data {
0010     u16 model;          /* 7877 */
0011     u16 vref_delay_usecs;   /* 0 for external vref; etc */
0012     u16 x_plate_ohms;
0013     u16 y_plate_ohms;
0014
0015     u16 x_min, x_max;
0016     u16 y_min, y_max;
0017     u16 pressure_min, pressure_max;
0018
0019     u8  stopacq_polarity;   /* 1 = Active HIGH, 0 = Active LOW */
0020     u8  first_conversion_delay; /* 0 = 0.5us, 1 = 128us, 2 = 1ms, 3 = 8ms */
0021     u8  acquisition_time;   /* 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */
0022     u8  averaging;      /* 0 = 1, 1 = 4, 2 = 8, 3 = 16 */
0023     u8  pen_down_acc_interval;  /* 0 = covert once, 1 = every 0.5 ms,
0024                        2 = ever 1 ms,   3 = every 8 ms,*/
0025 };