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-rw-r--r--include/linux/input/touchscreen/ts_filter.h74
-rw-r--r--include/linux/input/touchscreen/ts_filter_chain.h58
-rw-r--r--include/linux/input/touchscreen/ts_filter_group.h36
-rw-r--r--include/linux/input/touchscreen/ts_filter_linear.h31
-rw-r--r--include/linux/input/touchscreen/ts_filter_mean.h28
-rw-r--r--include/linux/input/touchscreen/ts_filter_median.h32
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