1/* linux/spi/ads7846.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 */ 8enum ads7846_filter { 9 ADS7846_FILTER_OK, 10 ADS7846_FILTER_REPEAT, 11 ADS7846_FILTER_IGNORE, 12}; 13 14struct ads7846_platform_data { 15 u16 model; /* 7843, 7845, 7846. */ 16 u16 vref_delay_usecs; /* 0 for external vref; etc */ 17 int keep_vref_on:1; /* set to keep vref on for differential 18 * measurements as well */ 19 u16 x_plate_ohms; 20 u16 y_plate_ohms; 21 22 u16 x_min, x_max; 23 u16 y_min, y_max; 24 u16 pressure_min, pressure_max; 25 26 u16 debounce_max; /* max number of additional readings 27 * per sample */ 28 u16 debounce_tol; /* tolerance used for filtering */ 29 u16 debounce_rep; /* additional consecutive good readings 30 * required after the first two */ 31 int (*get_pendown_state)(void); 32 int (*filter_init) (struct ads7846_platform_data *pdata, 33 void **filter_data); 34 int (*filter) (void *filter_data, int data_idx, int *val); 35 void (*filter_cleanup)(void *filter_data); 36}; 37