target/linux/s3c24xx/files-2.6.30/include/linux/touchscreen/ts_filter_chain.h

   1 #ifndef __TS_FILTER_CHAIN_H__
   2 #define __TS_FILTER_CHAIN_H__
   3
   4 /*
   5  * Touchscreen filter chains.
   6  *
   7  * (c) 2008,2009 Andy Green <andy@openmoko.com>
   8  */
   9
  10 #include "ts_filter.h"
  11
  12 #include <linux/err.h>
  13
  14 struct ts_filter_chain_configuration {
  15         /* API to use. */
  16         const struct ts_filter_api *api;
  17         /* Generic filter configuration. Different for each filter. */
  18         const struct ts_filter_configuration *config;
  19 };
  20
  21 struct ts_filter_chain;
  22
  23 #ifdef CONFIG_TOUCHSCREEN_FILTER
  24
  25 /*
  26  * Create a filter chain. It will allocate an array of
  27  * null-terminated pointers to filters. On error it will return
  28  * an error you can check with IS_ERR.
  29  */
  30 extern struct ts_filter_chain *ts_filter_chain_create(
  31         struct platform_device *pdev,
  32         const struct ts_filter_chain_configuration conf[],
  33         int count_coords);
  34
  35 /* Destroy the chain. */
  36 extern void ts_filter_chain_destroy(struct ts_filter_chain *c);
  37
  38 /* Clear the filter chain. */
  39 extern void ts_filter_chain_clear(struct ts_filter_chain *c);
  40
  41 /*
  42  * Try to get one point. Returns 0 if no points are available.
  43  * coords will be used as temporal space, thus you supply a point
  44  * using coords but you shouldn't rely on its value on return unless
  45  * it returns a nonzero value that is not -1.
  46  * If one of the filters find an error then this function will
  47  * return -1.
  48  */
  49 int ts_filter_chain_feed(struct ts_filter_chain *c, int *coords);
  50
  51 #else /* !CONFIG_TOUCHSCREEN_FILTER */
  52 #define ts_filter_chain_create(pdev, config, count_coords) (NULL)
  53 #define ts_filter_chain_destroy(c) do { } while (0)
  54 #define ts_filter_chain_clear(c) do { } while (0)
  55 #define ts_filter_chain_feed(c, coords) (1)
  56 #endif
  57
  58 #endif