+--- /dev/null 2005-02-14 22:51:21.000000000 +0000
++++ tslib/plugins/linear-h2200.c 2005-02-14 21:49:54.000000000 +0000
+@@ -0,0 +1,121 @@
++/*
++ * tslib/plugins/linear-h2200.c
++ *
++ * Copyright (C) 2004 Michael Opdenacker
++ *
++ * This file is placed under the LGPL. Please see the file
++ * COPYING for more details.
++ *
++ * $Id$
++ *
++ * Linearly scale touchscreen values for HP iPAQ h22xx.
++ */
++
++#include <stdlib.h>
++#include <string.h>
++#include <sys/types.h>
++#include <sys/stat.h>
++#include <unistd.h>
++#include <fcntl.h>
++
++#include <stdio.h>
++
++#include "tslib.h"
++#include "tslib-filter.h"
++
++struct tslib_linear_h2200 {
++ struct tslib_module_info module;
++};
++
++/*
++
++ Thanks to Lau Norgaard <lau@robo.dk> for the formula!
++
++ [u v] = [1 x y x*y x2 y2] * P
++
++ P = [ 14.0274374997464 -10.4143500663246
++ 0.963183808844262 0.123820939383483
++ -0.0175631972840528 0.90783932803656
++ 3.01072646091237e-005 -0.00022066295637918
++ 1.78550793439434e-005 5.26174785439132e-006
++ 1.24328256232492e-006 0.000171150736110672]
++
++ Using fixed point arithmetics as ARM processors don't have floating point
++ capabilities. Otherwise, using floating point would cause time consuming
++ kernel exceptions. With our input and output data, found that we could
++ use a 12.20 format, provided we use extra intermediate shifts with very
++ small numbers and products are done in a careful order that doesn't
++ yield big intermediate products).
++
++*/
++
++#define M20(x,y) ((long)(((long long)x * (long long)y) >> 20))
++#define M32(x,y) ((long)(((long long)x * (long long)y) >> 32))
++
++static int
++linear_h2200_read(struct tslib_module_info *info, struct ts_sample *samp, int nr)
++{
++ int ret;
++ long x, y, new_x, new_y;
++
++ ret = info->next->ops->read(info->next, samp, nr);
++ if (ret >= 0) {
++ int nr;
++
++ for (nr = 0; nr < ret; nr++, samp++) {
++
++ x = ((long) samp->x) << 20;
++ y = ((long) samp->y) << 20;
++
++ /* Caution: constants have been multiplied by 2^20
++ (to save runtime). Some of them have been
++ multiplied by 2^32 when they were too small.
++ An extra >>12 is then needed.
++
++ Note: we never multiply x*y or y*y first
++ (intermediate result too big, could overflow),
++ we multiply by the constant first. Because of this,
++ we can't reuse x^2, y^2 and x*y
++ */
++
++ new_x = 14708834 + M20(1009971,x) + M20(-18416,y) +
++ M20(M32(129310,x),y) + M20(M32(76687,x),x) +
++ M20(M32(5340,y),y);
++
++ new_y = -10920238 + M20(129836,x) + M20(951939,y) +
++ M20(M32(-947740,x),y) + M20(M32(22599,x),x) +
++ M20(M32(735087,y),y);
++
++ samp->x = (int) (new_x >> 20);
++ samp->y = (int) (new_y >> 20);
++ }
++ }
++
++ return ret;
++}
++
++static int linear_h2200_fini(struct tslib_module_info *info)
++{
++ free(info);
++ return 0;
++}
++
++static const struct tslib_ops linear_h2200_ops =
++{
++ .read = linear_h2200_read,
++ .fini = linear_h2200_fini,
++};
++
++struct tslib_module_info *mod_init(struct tsdev *dev, const char *params)
++{
++
++ struct tslib_linear_h2200 *lin;
++
++ lin = malloc(sizeof(struct tslib_linear_h2200));
++ if (lin == NULL)
++ return NULL;
++
++ lin->module.ops = &linear_h2200_ops;
++
++ return &lin->module;
++}
+Index: configure.ac
+===================================================================
+RCS file: /mnt/src/cvsroot/tslib/configure.ac,v
+retrieving revision 1.1
+diff -u -r1.1 configure.ac
+--- tslib/configure.ac 21 Jul 2004 19:17:17 -0000 1.1
++++ tslib/configure.ac 16 Feb 2005 23:03:07 -0000
+@@ -63,6 +63,15 @@
+ AC_MSG_RESULT($dejitter_module)
+ AM_CONDITIONAL(ENABLE_DEJITTER_MODULE, test "$dejitter_module" = "yes")
+
++AC_MSG_CHECKING([whether linear-h2200 module is requested])
++AC_ARG_ENABLE(dejitter,
++ AS_HELP_STRING([--enable-linear-h2200],
++ [Enable building of linearizing filter for iPAQ h2200 (default=yes)]),
++ [h2200_linear_module=$enableval],
++ [h2200_linear_module=yes])
++AC_MSG_RESULT($h2200_linear_module)
++AM_CONDITIONAL(ENABLE_H2200_LINEAR_MODULE, test "$h2200_linear_module" = "yes")
++
+ AC_MSG_CHECKING([whether variance module is requested])
+ AC_ARG_ENABLE(variance,
+ AS_HELP_STRING([--enable-variance],
+Index: Makefile.am
+===================================================================
+RCS file: /mnt/src/cvsroot/tslib/plugins/Makefile.am,v
+retrieving revision 1.4
+diff -u -r1.4 Makefile.am
+--- tslib/plugins/Makefile.am 21 Jul 2004 19:12:58 -0000 1.4
++++ tslib/plugins/Makefile.am 16 Feb 2005 23:09:22 -0000
+@@ -85,6 +85,12 @@
+ INPUT_MODULE =
+ endif
+
++if ENABLE_H2200_LINEAR_MODULE
++H2200_LINEAR_MODULE = linear_h2200.la
++else
++H2200_LINEAR_MODULE =
++endif
++
+ pluginexec_LTLIBRARIES = \
+ $(LINEAR_MODULE) \
+ $(DEJITTER_MODULE) \
+@@ -96,6 +102,7 @@
+ $(H3600_MODULE) \
+ $(MK712_MODULE) \
+ $(ARCTIC2_MODULE) \
++ $(H2200_LINEAR_MODULE) \
+ $(INPUT_MODULE)
+
+ variance_la_SOURCES = variance.c
+@@ -131,3 +138,6 @@
+
+ input_la_SOURCES = input-raw.c
+ input_la_LDFLAGS = -module $(LTVSN)
++
++linear_h2200_la_SOURCES = linear-h2200.c
++linear_h2200_la_LDFLAGS = -module $(LTVSN)
git.openpandora.org / openembedded.git / commitdiff