diff options
Diffstat (limited to 'include/linux/spi/ads7846.h')
| -rw-r--r-- | include/linux/spi/ads7846.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h new file mode 100644 index 00000000..c64de9dd --- /dev/null +++ b/include/linux/spi/ads7846.h @@ -0,0 +1,60 @@ +/* linux/spi/ads7846.h */ + +/* Touchscreen characteristics vary between boards and models. The + * platform_data for the device's "struct device" holds this information. + * + * It's OK if the min/max values are zero. + */ +enum ads7846_filter { + ADS7846_FILTER_OK, + ADS7846_FILTER_REPEAT, + ADS7846_FILTER_IGNORE, +}; + +struct ads7846_platform_data { + u16 model; /* 7843, 7845, 7846, 7873. */ + u16 vref_delay_usecs; /* 0 for external vref; etc */ + u16 vref_mv; /* external vref value, milliVolts + * ads7846: if 0, use internal vref */ + bool keep_vref_on; /* set to keep vref on for differential + * measurements as well */ + bool swap_xy; /* swap x and y axes */ + + /* Settling time of the analog signals; a function of Vcc and the + * capacitance on the X/Y drivers. If set to non-zero, two samples + * are taken with settle_delay us apart, and the second one is used. + * ~150 uSec with 0.01uF caps. + */ + u16 settle_delay_usecs; + + /* If set to non-zero, after samples are taken this delay is applied + * and penirq is rechecked, to help avoid false events. This value + * is affected by the material used to build the touch layer. + */ + u16 penirq_recheck_delay_usecs; + + u16 x_plate_ohms; + u16 y_plate_ohms; + + u16 x_min, x_max; + u16 y_min, y_max; + u16 pressure_min, pressure_max; + + u16 debounce_max; /* max number of additional readings + * per sample */ + u16 debounce_tol; /* tolerance used for filtering */ + u16 debounce_rep; /* additional consecutive good readings + * required after the first two */ + int gpio_pendown; /* the GPIO used to decide the pendown + * state if get_pendown_state == NULL + */ + int (*get_pendown_state)(void); + int (*filter_init) (const struct ads7846_platform_data *pdata, + void **filter_data); + int (*filter) (void *filter_data, int data_idx, int *val); + void (*filter_cleanup)(void *filter_data); + void (*wait_for_sync)(void); + bool wakeup; + unsigned long irq_flags; +}; + |