一线触摸tslib移植完全说明--转载

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

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sudo apt-get install libtool autoconf automake git

2 使用git获取tslib源代码

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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：

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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。

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#

# This patch adds support for one wire input raw module (Linux /dev/touchscreen-1wire support).

#

# Signed-off-by: Richard Nee <richard.nee.cn@gmail.com>

#

--- 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

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./autogen.sh

echo "ac_cv_func_malloc_0_nonnull=yes" > cache-file.cache

./configure --host=arm-linux \

--cache-file=cache-file.cache \

--prefix=/usr/local/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

切换到/usr/tslib/local/tslib--就是tslib安装的目录

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echo "module_raw one_wire_ts_input" > ts.conf.bck

cat $PWD/etc/ts.conf >>ts.conf.bck

mv ts.conf.bck $PWD/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

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#! /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

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ts_calibrate

ok，good luck : )