1 files changed, 74 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..632e5fb3f4e
--- /dev/null
+++ b/drivers/input/touchscreen/ts_filter.h
@@ -0,0 +1,74 @@
+#ifndef __TS_FILTER_H__
+#define __TS_FILTER_H__
+
+/*
+ * Touchscreen filter.
+ *
+ * (c) 2008,2009 Andy Green <andy@warmcat.com>
+ */
+
+#include <linux/platform_device.h>
+
+#define MAX_TS_FILTER_COORDS		3  /* X, Y and Z (pressure). */
+
+struct ts_filter;
+struct ts_filter_configuration;
+
+/* Operations that a filter can perform. */
+
+struct ts_filter_api {
+	/* Create the filter - mandatory. */
+	struct ts_filter * (*create)(
+		struct platform_device *pdev,
+		const struct ts_filter_configuration *config,
+		int count_coords);
+	/* Destroy the filter - mandatory. */
+	void (*destroy)(struct ts_filter *filter);
+	/* Clear the filter - optional. */
+	void (*clear)(struct ts_filter *filter);
+
+
+	/*
+	 * The next three API functions only make sense if all of them are
+	 * set for a filter. If a filter has the next three methods then
+	 * it can propagate coordinates in the chain.
+	 */
+
+	/*
+	 * Process the filter.
+	 * It returns non-zero if the filter reaches an error.
+	 */
+	int (*process)(struct ts_filter *filter, int *coords);
+	/*
+	 * Is the filter ready to return a point?
+	 * Please do not code side effects in this function.
+	 */
+	int (*haspoint)(struct ts_filter *filter);
+	/*
+	 * Get a point.
+	 * Do not call unless the filter actually has a point to deliver.
+	 */
+	void (*getpoint)(struct ts_filter *filter, int *coords);
+
+	/*
+	 * Scale the points - optional.
+	 * A filter could only scale coordinates.
+	 */
+	void (*scale)(struct ts_filter *filter, int *coords);
+};
+
+/*
+ * Generic filter configuration. Actual configurations have this structure
+ * as a member.
+ */
+struct ts_filter_configuration {
+};
+
+struct ts_filter {
+	/* Operations for this filter. */
+	const struct ts_filter_api *api;
+	/* Number of coordinates to process. */
+	int count_coords;
+};
+
+#endif