mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 22:24:09 +08:00
1d25891f32
Pendown status from the PENIRQ pin is currently read only at the beginning of a sample set. If the pen is lifted just after sampling has began then sampled values become wrong. This patch adds an optional platform penirq_recheck_delay attribute. If non-zero, samples are only reported to the input subsystem if PENIRQ is still active that long after the samples taken. Signed-off-by: Semih Hazar <semih.hazar@indefia.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
52 lines
1.6 KiB
C
52 lines
1.6 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. */
|
|
u16 vref_delay_usecs; /* 0 for external vref; etc */
|
|
int keep_vref_on:1; /* set to keep vref on for differential
|
|
* measurements as well */
|
|
|
|
/* 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 (*get_pendown_state)(void);
|
|
int (*filter_init) (struct ads7846_platform_data *pdata,
|
|
void **filter_data);
|
|
int (*filter) (void *filter_data, int data_idx, int *val);
|
|
void (*filter_cleanup)(void *filter_data);
|
|
};
|
|
|