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 */
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/* Touchscreen characteristics vary between boards and models. The
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* platform_data for the device's "struct device" holds this information.
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*
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* It's OK if the min/max values are zero.
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*/
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enum ads7846_filter {
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ADS7846_FILTER_OK,
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ADS7846_FILTER_REPEAT,
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ADS7846_FILTER_IGNORE,
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};
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struct ads7846_platform_data {
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u16 model; /* 7843, 7845, 7846. */
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u16 vref_delay_usecs; /* 0 for external vref; etc */
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int keep_vref_on:1; /* set to keep vref on for differential
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* measurements as well */
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/* Settling time of the analog signals; a function of Vcc and the
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* capacitance on the X/Y drivers. If set to non-zero, two samples
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* are taken with settle_delay us apart, and the second one is used.
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* ~150 uSec with 0.01uF caps.
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*/
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u16 settle_delay_usecs;
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/* If set to non-zero, after samples are taken this delay is applied
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* and penirq is rechecked, to help avoid false events. This value
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* is affected by the material used to build the touch layer.
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*/
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u16 penirq_recheck_delay_usecs;
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u16 x_plate_ohms;
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u16 y_plate_ohms;
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u16 x_min, x_max;
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u16 y_min, y_max;
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u16 pressure_min, pressure_max;
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u16 debounce_max; /* max number of additional readings
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* per sample */
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u16 debounce_tol; /* tolerance used for filtering */
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u16 debounce_rep; /* additional consecutive good readings
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* required after the first two */
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int (*get_pendown_state)(void);
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int (*filter_init) (struct ads7846_platform_data *pdata,
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void **filter_data);
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int (*filter) (void *filter_data, int data_idx, int *val);
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void (*filter_cleanup)(void *filter_data);
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};
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