1 /* linux/spi/ad7879.h */ 2 3 /* Touchscreen characteristics vary between boards and models. The 4 * platform_data for the device's "struct device" holds this information. 5 * 6 * It's OK if the min/max values are zero. 7 */ 8 struct ad7879_platform_data { 9 u16 model; /* 7879 */ 10 u16 x_plate_ohms; 11 u16 x_min, x_max; 12 u16 y_min, y_max; 13 u16 pressure_min, pressure_max; 14 15 /* [0..255] 0=OFF Starts at 1=550us and goes 16 * all the way to 9.440ms in steps of 35us. 17 */ 18 u8 pen_down_acc_interval; 19 /* [0..15] Starts at 0=128us and goes all the 20 * way to 4.096ms in steps of 128us. 21 */ 22 u8 first_conversion_delay; 23 /* [0..3] 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */ 24 u8 acquisition_time; 25 /* [0..3] Average X middle samples 0 = 2, 1 = 4, 2 = 8, 3 = 16 */ 26 u8 averaging; 27 /* [0..3] Perform X measurements 0 = OFF, 28 * 1 = 4, 2 = 8, 3 = 16 (median > averaging) 29 */ 30 u8 median; 31 /* 1 = AUX/VBAT/GPIO export GPIO to gpiolib 32 * requires CONFIG_GPIOLIB 33 */ 34 bool gpio_export; 35 /* identifies the first GPIO number handled by this chip; 36 * or, if negative, requests dynamic ID allocation. 37 */ 38 s32 gpio_base; 39 }; 40