HID android add touch screen

http://www.csdn123.com/html/mycsdn20140110/51/51b546889ce6b73e52c781c37f5d0af6.html

添加VID/PID到标准hid设备-OK

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修改文件：

     1、在hid-ids.h中加入vid pid 

  
     2、在hid-multitouch..c->mt_devices[] 中加入
          {

               .driver_data=MT_CLS_DEFAULT,
                 HID_USB_DEVICE(VID,PID)

          }

     
     3、在hid-core.c->hid_have_special_driver[]中加入HID_USB_DEVICE(VID,PID)

     

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4:添加内核配置选项：

    

5： 

    

7：

  

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8:http://source.android.com/tech/input/input-device-configuration-files.html

   根据这个网站添加上层IDC文件：

  

9：

# Copyright (C) 2012 Beijing IRTOUCH SYSTEMS Co.,Ltd### Input Device Configuration File for the IRTOUCH touch screen.## Basic Parameterstouch.deviceType = touchscreentouch.orientationAware = 1# 0 外部设备，1 内部设备device.internal = 1# Touch Size#touch.touchSize.calibration = pressure#touch.toolSize.calibration = linear#touch.toolSize.linearScale = 10#touch.toolSize.linearBias = 160#touch.toolSize.isSummed = 1# Size#touch.size.calibration = diameter#touch.size.scale = 10#touch.size.bias = 0#touch.size.isSummed = 0#scale 规模，面，比例；#bias 偏压，偏差#summed 总结# Pressure压力-/amplitude振幅#touch.pressure.calibration = amplitude#touch.pressure.scale = 0.005# Orientation方向-/校准touch.orientetion.calibration = none

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     上面那个idc文件不能用，用下面这个idc文件，Android 触摸屏idc文件一般都是通用的，我的用这个下面这个idc文件就可以了，知识触摸屏没有鼠标箭头，但是鼠标点哪里就是去哪里：

 

# Copyright (C) 2010 The Android Open Source Project## Licensed under the Apache License, Version 2.0 (the "License");# you may not use this file except in compliance with the License.# You may obtain a copy of the License at## http://www.apache.org/licenses/LICENSE-2.0## Unless required by applicable law or agreed to in writing, software# distributed under the License is distributed on an "AS IS" BASIS,# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.# See the License for the specific language governing permissions and# limitations under the License.## Emulator keyboard configuration file #1.## Basic Parameterstouch.deviceType = touchScreentouch.orientationAware = 1touch.size.calibration=diametertouch.size.scale=10touch.size.bias=0touch.size.isSummed=0touch.size.pressure.calibration=amplitudetouch.pressure.scale=0.005touch.orientation.calibration=none

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10: adb shell 

    su

    mount

   

    mount -w -o remount  /dev/block/platform/omap/omap_hsmmc.0/by-name/system     /system

 

    

 

   

    chmod 777 /system/usr/idc   =>修改idc文件可写权限；

   

     adb push /home/tonsincs/Vendor_0416_Product_5030_Version_0110.idc /system/usr/idc/

   

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11：还有一种把 IDC 文件放到/system/usr/idc/ 目录下的方法：

     1）把你的 IDC 文件拷贝到android源码：frameworks/base/data/keyboards/ 目录下；

     2）修改common.mk文件：

     

     3）croot 到android源码根目录： make -j8 完成后，find 命令在out目录查找下……结果如下则OK；

    

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总结：

       最近一直移植Android（4.1）下面的触摸屏驱动，也接触到了几种触摸屏，总的来说，要么把触摸屏当标准的HID设备来用，这个移植就简单，把触摸屏的VID/PID加到hid-ids.h hid-core.c hid-multitouch.c 文件里面，而且还要上层/system/usr/idc/Vendor_xxx_Product_xxx.idc文件配合，触摸屏才能使用，否则你的触摸屏用着跟笔记本的触摸板似得！

       个人理解，修改drivers/input/touchscreen/usttouchscreen.c文件中添加你的触摸屏驱动可以，不过这个比较麻烦，你要知道怎么写驱动，一些函数怎么实现，算法怎么实现；比较麻烦；

       也接触到了i2c总线的触摸屏驱动，这个又比较麻烦一点，要根据你的arch/arm/mach-xxxx/board-xxx.c文件中注册你的触摸屏驱动i2c总线信息；再添加你的驱动源码；

       总得来说，写驱动的话比较麻烦，你必须有电路原理图、芯片数据手册，而且要看的明明白白，怎么去是实现那些算法，而且要对linux 驱动很了解，你的驱动挂载哪里，i2c总线、usb总线，又要很多协议；很多知识；usb2.0协议，英文287页；很麻烦！慢慢学习了！