61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
|
/* 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;
|
||
|
|
};
|
||
|
|
|