diff options
Diffstat (limited to 'include/linux/input/touchscreen/ts_filter_chain.h')
-rw-r--r-- | include/linux/input/touchscreen/ts_filter_chain.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/include/linux/input/touchscreen/ts_filter_chain.h b/include/linux/input/touchscreen/ts_filter_chain.h new file mode 100644 index 00000000000..a021ba25bd4 --- /dev/null +++ b/include/linux/input/touchscreen/ts_filter_chain.h @@ -0,0 +1,58 @@ +#ifndef __TS_FILTER_CHAIN_H__ +#define __TS_FILTER_CHAIN_H__ + +/* + * Touchscreen filter chains. + * + * (c) 2008,2009 Andy Green <andy@warmcat.com> + */ + +#include <linux/input/touchscreen/ts_filter.h> + +#include <linux/err.h> + +struct ts_filter_chain_configuration { + /* API to use. */ + const struct ts_filter_api *api; + /* Generic filter configuration. Different for each filter. */ + const struct ts_filter_configuration *config; +}; + +struct ts_filter_chain; + +#ifdef CONFIG_TOUCHSCREEN_FILTER + +/* + * Create a filter chain. It will allocate an array of + * null-terminated pointers to filters. On error it will return + * an error you can check with IS_ERR. + */ +extern struct ts_filter_chain *ts_filter_chain_create( + struct platform_device *pdev, + const struct ts_filter_chain_configuration conf[], + int count_coords); + +/* Destroy the chain. */ +extern void ts_filter_chain_destroy(struct ts_filter_chain *c); + +/* Clear the filter chain. */ +extern void ts_filter_chain_clear(struct ts_filter_chain *c); + +/* + * Try to get one point. Returns 0 if no points are available. + * coords will be used as temporal space, thus you supply a point + * using coords but you shouldn't rely on its value on return unless + * it returns a nonzero value that is not -1. + * If one of the filters find an error then this function will + * return -1. + */ +int ts_filter_chain_feed(struct ts_filter_chain *c, int *coords); + +#else /* !CONFIG_TOUCHSCREEN_FILTER */ +#define ts_filter_chain_create(pdev, config, count_coords) (NULL) +#define ts_filter_chain_destroy(c) do { } while (0) +#define ts_filter_chain_clear(c) do { } while (0) +#define ts_filter_chain_feed(c, coords) (1) +#endif + +#endif |