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