一线触摸tslib移植完全说明

原文来自：http://blog.csdn.net/niyufeng/article/details/7546796

我已经上传了完善好的源代码，已经加入对一线触摸的支持，如果想直接使用，不用自己加补丁：
请到http://code.google.com/p/openwrt-for-embedded/，点击Download页面，下载tslib-one-wire.tar.bz2。
但是建议你把下面的内容看完，以便使用这个已经加入对一线触摸支持的tslib。

一开始接触时，感觉友善的触摸屏好奇怪啊，和一般普通的很不一样（之前我不是使用友善的产品），都不知道该怎么移植tslib了～

一般普通的tslib-1.4之类的和这个友善提供开源tslib（源码见：http://www.arm9home.net/read.php?tid-16105.html）什么关系？首先要搞懂这个才可以继续。

        答：友善之臂提供的这个tslib实际上是标准tslib的一个模块，用来向标准的tslib提供访问一线触摸屏驱动的接口的(因为这个驱动和一般的input event based input设备不同)。你需要在板子上先加载标准的tslib, 然后再通过修改tslib的配置文件加载这个模块。

ok，下面开始移植！

1 首先安装必要的工具

sudo apt-get install libtool autoconf automake git

sudo apt-get install libtool autoconf automake git 

2 使用git获取tslib源代码

git clone https://github.com/kergoth/tslib

git clone https://github.com/kergoth/tslib

或者到下载我已经加入补丁的支持友善之臂一线触摸的tslib：

3 支持友善之臂一线触摸的tslib补丁tslib-one-wire.patch

友善已经提供开源tslib（源码见：http://www.arm9home.net/read.php?tid-16105.html）。

但是另外再编译它有点罗嗦，所以我直接制作一个补丁tslib-one-wire.patch来支持友善之臂一线触摸。

操作如下，把tslib-one-wire.patch拷贝到tslib根目录，然后补丁上：

cp tslib-one-wire.patch tslib/
cd tslib/
patch -p1 <tslib-one-wire.patch

cp tslib-one-wire.patch tslib/
cd tslib/
patch -p1 <tslib-one-wire.patch

tslib-one-wire.patch源码见下，copy下来然后命名成tslib-one-wire.patch就ok了，然后用上面操作。

#
# This patch adds support for one wire input raw module (Linux /dev/touchscreen-1wire support).
#
# Signed-off-by: Richard Nee <[email protected]>
#


--- tslib.orig/configure.ac	2012-05-07 22:28:42.000000000 +0800
+++ tslib/configure.ac	2012-05-07 23:53:18.849542215 +0800
@@ -68,6 +68,7 @@
 TSLIB_CHECK_MODULE([dmc], [yes], [Enable building of dmc raw module (HP iPaq DMC support)])
 TSLIB_CHECK_MODULE([input], [yes], [Enable building of generic input raw module (Linux /dev/input/eventN support)])
 TSLIB_CHECK_MODULE([touchkit], [yes], [Enable building of serial TouchKit raw module (Linux /dev/ttySX support)])
+TSLIB_CHECK_MODULE([one-wire-ts-input], [yes], [Enable building of one wire input raw module (Linux /dev/touchscreen-1wire support)])
 
 AC_MSG_CHECKING([where to place modules])
 AC_ARG_WITH(plugindir,
--- tslib.orig/plugins/Makefile.am	2012-05-07 22:28:42.000000000 +0800
+++ tslib/plugins/Makefile.am	2012-05-08 00:08:59.229542649 +0800
@@ -114,6 +114,12 @@
 CY8MRLN_PALMPRE_MODULE =
 endif
 
+if ENABLE_ONE_WIRE_TS_INPUT_MODULE
+ONE_WIRE_TS_INPUT_MODULE = one_wire_ts_input.la
+else
+ONE_WIRE_TS_INPUT_MODULE =
+endif
+
 pluginexec_LTLIBRARIES = \
 	$(LINEAR_MODULE) \
 	$(DEJITTER_MODULE) \
@@ -130,7 +136,8 @@
 	$(H2200_LINEAR_MODULE) \
 	$(INPUT_MODULE) \
 	$(TOUCHKIT_MODULE) \
-	$(CY8MRLN_PALMPRE_MODULE)
+	$(CY8MRLN_PALMPRE_MODULE) \
+	$(ONE_WIRE_TS_INPUT_MODULE)
   
 variance_la_SOURCES	= variance.c
 variance_la_LDFLAGS	= -module $(LTVSN)
@@ -185,3 +192,6 @@
 
 cy8mrln_palmpre_la_SOURCES = cy8mrln-palmpre.c
 cy8mrln_palmpre_la_LDFLAGS = -module $(LTVSN)
+
+one_wire_ts_input_la_SOURCES = one-wire-ts-input.c
+one_wire_ts_input_la_LDFLAGS = -module $(LTVSN)
--- tslib.orig/plugins/plugins.h	2012-05-07 22:28:42.000000000 +0800
+++ tslib/plugins/plugins.h	2012-05-07 23:57:38.369542335 +0800
@@ -16,3 +16,4 @@
 TSLIB_DECLARE_MODULE(tatung);
 TSLIB_DECLARE_MODULE(input);
 TSLIB_DECLARE_MODULE(cy8mrln_palmpre);
+TSLIB_DECLARE_MODULE(one_wire_ts_input);
--- /dev/null	2012-05-08 11:52:49.481035009 +0800
+++ tslib/plugins/one-wire-ts-input.c	2012-05-08 12:04:38.749035337 +0800
@@ -0,0 +1,66 @@
+#include <termios.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <linux/fs.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/utsname.h>
+#include <time.h>
+
+#include "config.h"
+#include "tslib-private.h"
+
+static int misc_read(struct tslib_module_info *inf, struct ts_sample *samp, int nr)
+{
+	struct tsdev *ts = inf->dev;
+
+	int ret;
+	unsigned ts_status;
+	ret = read(ts->fd, &ts_status, sizeof ts_status);
+	if (ret < 0) {
+		return 0;
+	}
+	if (ret == 0) {
+		return 0;
+	}
+
+	samp->x = ((ts_status) >> 16) & 0x7FFF;
+	samp->y = ts_status & 0x7FFF;
+	samp->pressure = ts_status >> 31;
+	gettimeofday(&samp->tv,NULL);
+	nr = nr;
+
+	return 1;
+}
+static int ts_fini(struct tslib_module_info *inf)
+{
+        free(inf);
+        return 0;
+}
+
+static const struct tslib_ops misc_ops =
+{
+	.read	= misc_read,
+        .fini   = ts_fini,
+};
+
+TSAPI struct tslib_module_info *one_wire_ts_mod_init(struct tsdev *dev, const char *params)
+{
+	struct tslib_module_info *m;
+
+	m = malloc(sizeof(struct tslib_module_info));
+	if (m == NULL)
+		return NULL;
+
+	m->ops = &misc_ops;
+	return m;
+}
+
+#ifndef TSLIB_STATIC_FRIENDLYARM_TS_MODULE
+TSLIB_MODULE_INIT(one_wire_ts_mod_init);
+#endif

4 下面是配置编译tslib

./autogen.sh
echo "ac_cv_func_malloc_0_nonnull=yes" > cache-file.cache
./configure --host=arm-linux \
 --cache-file=cache-file.cache \
 --prefix=$PWD/install-tslib

make
make install

./autogen.sh
echo "ac_cv_func_malloc_0_nonnull=yes" > cache-file.cache
./configure --host=arm-linux \
 --cache-file=cache-file.cache \
 --prefix=$PWD/install-tslib

make
make install

安装在tslib/install-tslib/中

5 通过修改tslib的配置文件加载一线触摸模块

echo "module_raw one_wire_ts_input" > ts.conf.bck
cat $PWD/install-tslib/etc/ts.conf >>ts.conf.bck
mv ts.conf.bck $PWD/install-tslib/etc/ts.conf

echo "module_raw one_wire_ts_input" > ts.conf.bck
cat $PWD/install-tslib/etc/ts.conf >>ts.conf.bck
mv ts.conf.bck $PWD/install-tslib/etc/ts.conf

到目前位置tslib已经移植成功，下面就是要把install-tslib/拷贝到开发板合适的位置，然后运行测试tslib了～

6 测试

设置环境变量tslib-env.sh

#! /bin/sh

#export TSLIB_ROOT=/opt/tslib
export TSLIB_CALIBFILE=/etc/pointercal
export TSLIB_CONFFILE=/etc/ts.conf
export TSLIB_PLUGINDIR=/usr/lib/ts
export TSLIB_CONSOLEDEVICE=none
export TSLIB_FBDEVICE=/dev/fb0
export TSLIB_TSDEVICE=/dev/touchscreen-1wire
#export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$TSLIB_ROOT/lib
#export PATH=$PATH:$TSLIB_ROOT/bin

运行测试，进行5点校验

ts_calibrate

ts_calibrate

ok，good luck : )

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by 飞鸿惊雪