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#ifndef __TS_FILTER_H__
#define __TS_FILTER_H__
/*
* Touchscreen filter.
*
* (c) 2008 Andy Green <andy@openmoko.com>
*/
#include <linux/platform_device.h>
#define MAX_TS_FILTER_CHAIN 8 /* Max. filters we can chain up. */
#define MAX_TS_FILTER_COORDS 3 /* X, Y and Z (pressure). */
struct ts_filter;
/* Operations that a filter can perform. */
struct ts_filter_api {
struct ts_filter * (*create)(struct platform_device *pdev, void *config,
int count_coords);
void (*destroy)(struct platform_device *pdev, struct ts_filter *filter);
void (*clear)(struct ts_filter *filter);
int (*process)(struct ts_filter *filter, int *coords);
void (*scale)(struct ts_filter *filter, int *coords);
};
/*
* This is the common part of all filters.
* We use this type as an otherwise opaque handle on to
* the actual filter. Therefore you need one of these
* at the start of your actual filter struct.
*/
struct ts_filter {
struct ts_filter *next; /* Next in chain. */
struct ts_filter_api *api; /* Operations to use for this object. */
int count_coords;
int coords[MAX_TS_FILTER_COORDS];
};
/*
* Helper to create a filter chain from an array of API pointers and
* array of config ints. Leaves pointers to created filters in arr
* array and fills in ->next pointers to create the chain.
*/
extern int ts_filter_create_chain(struct platform_device *pdev,
struct ts_filter_api **api, void **config,
struct ts_filter **arr, int count_coords);
/* Helper to destroy a whole chain from the list of filter pointers. */
extern void ts_filter_destroy_chain(struct platform_device *pdev,
struct ts_filter **arr);
#endif
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