6 files changed, 259 insertions, 0 deletions
diff --git a/include/linux/input/touchscreen/ts_filter.h b/include/linux/input/touchscreen/ts_filter.h
new file mode 100644
index 00000000000..632e5fb3f4e
--- /dev/null
+++ b/include/linux/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
diff --git a/include/linux/input/touchscreen/ts_filter_chain.h b/include/linux/input/touchscreen/ts_filter_chain.h
new file mode 100644
index 00000000000..a021ba25bd4
--- /dev/null
+++ b/include/linux/input/touchscreen/ts_filter_chain.h
@@ -0,0 +1,58 @@
+#ifndef __TS_FILTER_CHAIN_H__
+#define __TS_FILTER_CHAIN_H__
+
+/*
+ * Touchscreen filter chains.
+ *
+ * (c) 2008,2009 Andy Green <andy@warmcat.com>
+ */
+
+#include <linux/input/touchscreen/ts_filter.h>
+
+#include <linux/err.h>
+
+struct ts_filter_chain_configuration {
+	/* API to use. */
+	const struct ts_filter_api *api;
+	/* Generic filter configuration. Different for each filter. */
+	const struct ts_filter_configuration *config;
+};
+
+struct ts_filter_chain;
+
+#ifdef CONFIG_TOUCHSCREEN_FILTER
+
+/*
+ * Create a filter chain. It will allocate an array of
+ * null-terminated pointers to filters. On error it will return
+ * an error you can check with IS_ERR.
+ */
+extern struct ts_filter_chain *ts_filter_chain_create(
+	struct platform_device *pdev,
+	const struct ts_filter_chain_configuration conf[],
+	int count_coords);
+
+/* Destroy the chain. */
+extern void ts_filter_chain_destroy(struct ts_filter_chain *c);
+
+/* Clear the filter chain. */
+extern void ts_filter_chain_clear(struct ts_filter_chain *c);
+
+/*
+ * Try to get one point. Returns 0 if no points are available.
+ * coords will be used as temporal space, thus you supply a point
+ * using coords but you shouldn't rely on its value on return unless
+ * it returns a nonzero value that is not -1.
+ * If one of the filters find an error then this function will
+ * return -1.
+ */
+int ts_filter_chain_feed(struct ts_filter_chain *c, int *coords);
+
+#else /* !CONFIG_TOUCHSCREEN_FILTER */
+#define ts_filter_chain_create(pdev, config, count_coords) (NULL)
+#define ts_filter_chain_destroy(c) do { } while (0)
+#define ts_filter_chain_clear(c) do { } while (0)
+#define ts_filter_chain_feed(c, coords) (1)
+#endif
+
+#endif
diff --git a/include/linux/input/touchscreen/ts_filter_group.h b/include/linux/input/touchscreen/ts_filter_group.h
new file mode 100644
index 00000000000..2d727f30086
--- /dev/null
+++ b/include/linux/input/touchscreen/ts_filter_group.h
@@ -0,0 +1,36 @@
+#ifndef __TS_FILTER_GROUP_H__
+#define __TS_FILTER_GROUP_H__
+
+#include <linux/input/touchscreen/ts_filter.h>
+
+/*
+ * Touchscreen group filter.
+ *
+ * Copyright (C) 2008,2009 by Openmoko, Inc.
+ * Author: Nelson Castillo <arhuaco@freaks-unidos.net>
+ *
+ */
+
+struct ts_filter_group_configuration {
+	/* Size of the filter. */
+	int length;
+	/*
+	 * If two points are separated by this distance or less they
+	 * are considered to be members of the same group.
+	 */
+	int close_enough;
+	/* Minimum allowed size for the biggest group in the sample set. */
+	int threshold;
+	/*
+	 * Number of times we try to get a group of points with at least
+	 * threshold points.
+	 */
+	int attempts;
+
+	/* Generic filter configuration. */
+	struct ts_filter_configuration config;
+};
+
+extern const struct ts_filter_api ts_filter_group_api;
+
+#endif
diff --git a/include/linux/input/touchscreen/ts_filter_linear.h b/include/linux/input/touchscreen/ts_filter_linear.h
new file mode 100644
index 00000000000..6f5e8307456
--- /dev/null
+++ b/include/linux/input/touchscreen/ts_filter_linear.h
@@ -0,0 +1,31 @@
+#ifndef __TS_FILTER_LINEAR_H__
+#define __TS_FILTER_LINEAR_H__
+
+#include <linux/input/touchscreen/ts_filter.h>
+#include <linux/kobject.h>
+
+/*
+ * Touchscreen linear filter.
+ *
+ * Copyright (C) 2008,2009 by Openmoko, Inc.
+ * Author: Nelson Castillo <arhuaco@freaks-unidos.net>
+ *
+ */
+
+#define TS_FILTER_LINEAR_NCONSTANTS 7
+
+struct ts_filter_linear_configuration {
+	/* Calibration constants. */
+	int constants[TS_FILTER_LINEAR_NCONSTANTS];
+	/* First coordinate. */
+	int coord0;
+	/* Second coordinate. */
+	int coord1;
+
+	/* Generic filter configuration. */
+	struct ts_filter_configuration config;
+};
+
+extern const struct ts_filter_api ts_filter_linear_api;
+
+#endif
diff --git a/include/linux/input/touchscreen/ts_filter_mean.h b/include/linux/input/touchscreen/ts_filter_mean.h
new file mode 100644
index 00000000000..d4870413987
--- /dev/null
+++ b/include/linux/input/touchscreen/ts_filter_mean.h
@@ -0,0 +1,28 @@
+#ifndef __TS_FILTER_MEAN_H__
+#define __TS_FILTER_MEAN_H__
+
+#include <linux/input/touchscreen/ts_filter.h>
+
+/*
+ * Touchscreen filter.
+ *
+ * mean
+ *
+ * (c) 2008,2009
+ *     Andy Green <andy@warmcat.com>
+ *     Nelson Castillo <arhuaco@freaks-unidos.net>
+ */
+
+/* Configuration for this filter. */
+struct ts_filter_mean_configuration {
+	/* Number of points for the mean. */
+	int length;
+
+	/* Generic filter configuration. */
+	struct ts_filter_configuration config;
+};
+
+/* API functions for the mean filter */
+extern const struct ts_filter_api ts_filter_mean_api;
+
+#endif /* __TS_FILTER_MEAN_H__ */
diff --git a/include/linux/input/touchscreen/ts_filter_median.h b/include/linux/input/touchscreen/ts_filter_median.h
new file mode 100644
index 00000000000..08051619531
--- /dev/null
+++ b/include/linux/input/touchscreen/ts_filter_median.h
@@ -0,0 +1,32 @@
+#ifndef __TS_FILTER_MEDIAN_H__
+#define __TS_FILTER_MEDIAN_H__
+
+#include <linux/input/touchscreen/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