Add touchscreen filters

Add filter source code and add it to the defconfig.

Signed-off-by: Nelson Castillo <arhuaco@freaks-unidos.net>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/ts_filter_median.h b/drivers/input/touchscreen/ts_filter_median.h
new file mode 100644
index 00000000000..b13f361bb6a
--- /dev/null
+++ b/drivers/input/touchscreen/ts_filter_median.h
@@ -0,0 +1,32 @@
+#ifndef __TS_FILTER_MEDIAN_H__
+#define __TS_FILTER_MEDIAN_H__
+
+#include "ts_filter.h"
+
+/*
+ * Touchscreen filter.
+ *
+ * median
+ *
+ * (c) 2008 Andy Green <andy@warmcat.com>
+ */
+
+struct ts_filter_median_configuration {
+	/* Size of the filter. */
+	int extent;
+	/* Precomputed midpoint. */
+	int midpoint;
+	/* A reference value for us to check if we are going fast or slow. */
+	int decimation_threshold;
+	/* How many points to replace if we're going fast. */
+	int decimation_above;
+	/* How many points to replace if we're going slow. */
+	int decimation_below;
+
+	/* Generic configuration. */
+	struct ts_filter_configuration config;
+};
+
+extern const struct ts_filter_api ts_filter_median_api;
+
+#endif