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 }; 43