[s3c24xx] bump to 2.6.30-rc6
[openwrt/svn-archive/archive.git] / 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