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 */ 8 enum ads7846_filter { 9 ADS7846_FILTER_OK, 10 ADS7846_FILTER_REPEAT, 11 ADS7846_FILTER_IGNORE, 12 }; 13 14 struct 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 * ads7846: if 0, use internal vref */ 19 bool keep_vref_on; /* set to keep vref on for differential 20 * measurements as well */ 21 bool swap_xy; /* swap x and y axes */ 22 23 /* Settling time of the analog signals; a function of Vcc and the 24 * capacitance on the X/Y drivers. If set to non-zero, two samples 25 * are taken with settle_delay us apart, and the second one is used. 26 * ~150 uSec with 0.01uF caps. 27 */ 28 u16 settle_delay_usecs; 29 30 /* If set to non-zero, after samples are taken this delay is applied 31 * and penirq is rechecked, to help avoid false events. This value 32 * is affected by the material used to build the touch layer. 33 */ 34 u16 penirq_recheck_delay_usecs; 35 36 u16 x_plate_ohms; 37 u16 y_plate_ohms; 38 39 u16 x_min, x_max; 40 u16 y_min, y_max; 41 u16 pressure_min, pressure_max; 42 43 u16 debounce_max; /* max number of additional readings 44 * per sample */ 45 u16 debounce_tol; /* tolerance used for filtering */ 46 u16 debounce_rep; /* additional consecutive good readings 47 * required after the first two */ 48 int gpio_pendown; /* the GPIO used to decide the pendown 49 * state if get_pendown_state == NULL */ 50 int gpio_pendown_debounce; /* platform specific debounce time for 51 * the gpio_pendown */ 52 int (*get_pendown_state)(void); 53 int (*filter_init) (const struct ads7846_platform_data *pdata, 54 void **filter_data); 55 int (*filter) (void *filter_data, int data_idx, int *val); 56 void (*filter_cleanup)(void *filter_data); 57 void (*wait_for_sync)(void); 58 bool wakeup; 59 unsigned long irq_flags; 60 }; 61 62