linux/spi/ads7846.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /* linux/spi/ads7846.h */
0003
0004 struct ads7846_platform_data {
0005     u16 model;          /* 7843, 7845, 7846, 7873. */
0006     u16 vref_delay_usecs;   /* 0 for external vref; etc */
0007     u16 vref_mv;        /* external vref value, milliVolts
0008                      * ads7846: if 0, use internal vref */
0009     bool    keep_vref_on;       /* set to keep vref on for differential
0010                      * measurements as well */
0011     bool    swap_xy;        /* swap x and y axes */
0012
0013     /* Settling time of the analog signals; a function of Vcc and the
0014      * capacitance on the X/Y drivers.  If set to non-zero, two samples
0015      * are taken with settle_delay us apart, and the second one is used.
0016      * ~150 uSec with 0.01uF caps.
0017      */
0018     u16 settle_delay_usecs;
0019
0020     /* If set to non-zero, after samples are taken this delay is applied
0021      * and penirq is rechecked, to help avoid false events.  This value
0022      * is affected by the material used to build the touch layer.
0023      */
0024     u16 penirq_recheck_delay_usecs;
0025
0026     u16 x_plate_ohms;
0027     u16 y_plate_ohms;
0028
0029     u16 x_min, x_max;
0030     u16 y_min, y_max;
0031     u16 pressure_min, pressure_max;
0032
0033     u16 debounce_max;       /* max number of additional readings
0034                      * per sample */
0035     u16 debounce_tol;       /* tolerance used for filtering */
0036     u16 debounce_rep;       /* additional consecutive good readings
0037                      * required after the first two */
0038     int gpio_pendown;       /* the GPIO used to decide the pendown
0039                      * state if get_pendown_state == NULL */
0040     int gpio_pendown_debounce;  /* platform specific debounce time for
0041                      * the gpio_pendown */
0042     int (*get_pendown_state)(void);
0043     void    (*wait_for_sync)(void);
0044     bool    wakeup;
0045     unsigned long irq_flags;
0046 };
0047