test-touchscreen-median.patch

Signed-off-by: Andy Green <andy@openmoko.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/include/linux/ts_filter.h b/include/linux/ts_filter.h
new file mode 100644
index 00000000000..7262bbaf3dd
--- /dev/null
+++ b/include/linux/ts_filter.h
@@ -0,0 +1,53 @@
+#ifndef __TS_FILTER_H__
+#define __TS_FILTER_H__
+
+/*
+ * touchscreen filter
+ *
+ * median
+ *
+ * (c) 2008 Andy Green <andy@openmoko.com>
+ */
+
+/* max filters you can chain up */
+#define MAX_TS_FILTER_CHAIN 4
+#define MAX_TS_FILTER_COORDS 6
+
+struct ts_filter;
+
+/* operations that a filter can perform
+ */
+struct ts_filter_api {
+	struct ts_filter * (*create)(void *config, int count_coords);
+	void (*destroy)(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, the result
+ * 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 array of API pointers and
+ * array of config ints... leaves pointers to created filters in list
+ * array and fills in ->next pointers to create the chain
+ */
+
+extern int ts_filter_create_chain(struct ts_filter_api **api, void **config,
+				     struct ts_filter **list, int count_coords);
+
+/* helper to destroy a whole chain from the list of filter pointers */
+
+extern void ts_filter_destroy_chain(struct ts_filter **list);
+#endif