test-touchscreen-median.patch

Signed-off-by: Andy Green <andy@openmoko.com>

3 files changed, 123 insertions, 0 deletions

diff --git a/include/linux/ts_filter.h b/include/linux/ts_filter.h
new file mode 100644
index 00000000000..7262bbaf3dd
--- /dev/null
+++ b/include/linux/ts_filter.h
@@ -0,0 +1,53 @@
+#ifndef __TS_FILTER_H__
+#define __TS_FILTER_H__
+
+/*
+ * touchscreen filter
+ *
+ * median
+ *
+ * (c) 2008 Andy Green <andy@openmoko.com>
+ */
+
+/* max filters you can chain up */
+#define MAX_TS_FILTER_CHAIN 4
+#define MAX_TS_FILTER_COORDS 6
+
+struct ts_filter;
+
+/* operations that a filter can perform
+ */
+struct ts_filter_api {
+	struct ts_filter * (*create)(void *config, int count_coords);
+	void (*destroy)(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, the result
+ * 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 array of API pointers and
+ * array of config ints... leaves pointers to created filters in list
+ * array and fills in ->next pointers to create the chain
+ */
+
+extern int ts_filter_create_chain(struct ts_filter_api **api, void **config,
+				     struct ts_filter **list, int count_coords);
+
+/* helper to destroy a whole chain from the list of filter pointers */
+
+extern void ts_filter_destroy_chain(struct ts_filter **list);
+#endif
diff --git a/include/linux/ts_filter_mean.h b/include/linux/ts_filter_mean.h
new file mode 100644
index 00000000000..46ff01a4c82
--- /dev/null
+++ b/include/linux/ts_filter_mean.h
@@ -0,0 +1,34 @@
+#ifndef __TS_FILTER_MEAN_H__
+#define __TS_FILTER_MEAN_H__
+
+#include <linux/ts_filter.h>
+
+/*
+ * touchscreen filter
+ *
+ * mean
+ *
+ * (c) 2008 Andy Green <andy@openmoko.com>
+ */
+
+struct ts_filter_mean_configuration {
+	int bits_filter_length;
+	int averaging_threshold;
+
+	int extent;
+};
+
+struct ts_filter_mean {
+	struct ts_filter tsf;
+	struct ts_filter_mean_configuration *config;
+
+	int reported[MAX_TS_FILTER_COORDS];
+	int lowpass[MAX_TS_FILTER_COORDS];
+	int *fifo[MAX_TS_FILTER_COORDS];
+	int fhead[MAX_TS_FILTER_COORDS];
+	int ftail[MAX_TS_FILTER_COORDS];
+};
+
+extern struct ts_filter_api ts_filter_mean_api;
+
+#endif
diff --git a/include/linux/ts_filter_median.h b/include/linux/ts_filter_median.h
new file mode 100644
index 00000000000..d81642883f7
--- /dev/null
+++ b/include/linux/ts_filter_median.h
@@ -0,0 +1,36 @@
+#ifndef __TS_FILTER_MEDIAN_H__
+#define __TS_FILTER_MEDIAN_H__
+
+#include <linux/ts_filter.h>
+
+/*
+ * touchscreen filter
+ *
+ * median
+ *
+ * (c) 2008 Andy Green <andy@openmoko.com>
+ */
+
+struct ts_filter_median_configuration {
+	int extent;
+	int midpoint;
+	int decimation_threshold;
+	int decimation_above;
+	int decimation_below;
+};
+
+struct ts_filter_median {
+	struct ts_filter tsf;
+	struct ts_filter_median_configuration *config;
+
+	int decimation_count;
+	int last_issued[MAX_TS_FILTER_COORDS];
+	int valid; /* how many samples in the sort buffer are valid */
+	int *sort[MAX_TS_FILTER_COORDS]; /* samples taken for median */
+	int *fifo[MAX_TS_FILTER_COORDS]; /* samples taken for median */
+	int pos; /* where we are in the fifo sample memory */
+};
+
+extern struct ts_filter_api ts_filter_median_api;
+
+#endif