1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* linux/spi/ads7846.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 enum ads7846_filter { 10 ADS7846_FILTER_OK, 11 ADS7846_FILTER_REPEAT, 12 ADS7846_FILTER_IGNORE, 13 }; 14 15 struct ads7846_platform_data { 16 u16 model; /* 7843, 7845, 7846, 7873. */ 17 u16 vref_delay_usecs; /* 0 for external vref; etc */ 18 u16 vref_mv; /* external vref value, milliVolts 19 * ads7846: if 0, use internal vref */ 20 bool keep_vref_on; /* set to keep vref on for differential 21 * measurements as well */ 22 bool swap_xy; /* swap x and y axes */ 23 24 /* Settling time of the analog signals; a function of Vcc and the 25 * capacitance on the X/Y drivers. If set to non-zero, two samples 26 * are taken with settle_delay us apart, and the second one is used. 27 * ~150 uSec with 0.01uF caps. 28 */ 29 u16 settle_delay_usecs; 30 31 /* If set to non-zero, after samples are taken this delay is applied 32 * and penirq is rechecked, to help avoid false events. This value 33 * is affected by the material used to build the touch layer. 34 */ 35 u16 penirq_recheck_delay_usecs; 36 37 u16 x_plate_ohms; 38 u16 y_plate_ohms; 39 40 u16 x_min, x_max; 41 u16 y_min, y_max; 42 u16 pressure_min, pressure_max; 43 44 u16 debounce_max; /* max number of additional readings 45 * per sample */ 46 u16 debounce_tol; /* tolerance used for filtering */ 47 u16 debounce_rep; /* additional consecutive good readings 48 * required after the first two */ 49 int gpio_pendown; /* the GPIO used to decide the pendown 50 * state if get_pendown_state == NULL */ 51 int gpio_pendown_debounce; /* platform specific debounce time for 52 * the gpio_pendown */ 53 int (*get_pendown_state)(void); 54 int (*filter_init) (const struct ads7846_platform_data *pdata, 55 void **filter_data); 56 int (*filter) (void *filter_data, int data_idx, int *val); 57 void (*filter_cleanup)(void *filter_data); 58 void (*wait_for_sync)(void); 59 bool wakeup; 60 unsigned long irq_flags; 61 }; 62 63