1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/ts_filter.h b/drivers/input/touchscreen/ts_filter.h
new file mode 100644
index 00000000000..5578e936b91
--- /dev/null
+++ b/drivers/input/touchscreen/ts_filter.h
@@ -0,0 +1,57 @@
+#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