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Input: ads7846 - pluggable filtering logic

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Some LCDs like the LS041Y3 require a customized filtering
logic for reliable readings, so make the filtering function
replacable through platform specific hooks.

Signed-off-by: Imre Deak <imre.deak@solidboot.com>
Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Imre Deak
2007-01-18 00:44:41 -05:00
committed by Dmitry Torokhov
parent 78a56aab11
commit da970e69ef
2 changed files with 105 additions and 40 deletions
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10
include/linux/spi/ads7846.h
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@@ -5,6 +5,12 @@
*
* 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 */
@@ -21,5 +27,9 @@ struct ads7846_platform_data {
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);
};