理解和使用linux的硬件抽象层hal - colorant的专栏 - csdn博客.htm

理解和使用Linux的硬件抽象层HAL.rar理解和使用Linux的硬件抽象层HAL.rar

<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT size=3><FONT 
face="Times New Roman">/usr/bin/hal-get-property<O:P></O:P></FONT></FONT></SPAN></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT size=3><FONT 
face="Times New Roman">/usr/bin/hal-set-property<O:P></O:P></FONT></FONT></SPAN></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT size=3><FONT 
face="Times New Roman">/usr/bin/hal-find-by-capability<O:P></O:P></FONT></FONT></SPAN></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT size=3><FONT 
face="Times New Roman">/usr/bin/hal-find-by-property<O:P></O:P></FONT></FONT></SPAN></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT size=3><FONT 
face="Times New Roman">/usr/bin/hal-disable-polling<O:P></O:P></FONT></FONT></SPAN></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT size=3><FONT 
face="Times New Roman">/usr/bin/hal-is-caller-locked-out<O:P></O:P></FONT></FONT></SPAN></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT size=3><FONT 
face="Times New Roman">/usr/bin/hal-lock<O:P></O:P></FONT></FONT></SPAN></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT size=3><FONT 
face="Times New Roman">/usr/sbin<O:P></O:P></FONT></FONT></SPAN></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT size=3><FONT 
face="Times New Roman">/usr/sbin/hald<O:P></O:P></FONT></FONT></SPAN></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN 
style="mso-ansi-language: EN"><O:P><FONT face="Times New Roman" 
size=3></FONT></O:P></SPAN></P>
<H2 style="MARGIN: 0cm 0cm 0pt 31.2pt"><FONT face="Times New Roman"><SPAN 
lang=EN 
style="mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN"><SPAN 
style="mso-list: Ignore">2.5<SPAN style="FONT: 7pt 'Times New Roman'"><FONT 
size=5>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</FONT></SPAN></SPAN></SPAN><SPAN lang=EN 
style="mso-ansi-language: EN">HAL</SPAN></FONT><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">的设备检测流程</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><O:P></O:P></SPAN></H2>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT 
face="Times New Roman">Hal</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">通过</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">udev</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">发现一个新的设备。</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><O:P></O:P></SPAN></FONT></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">首先，处理</SPAN><SPAN 
style="mso-ansi-language: EN"><FONT face="Times New Roman"> <SPAN 
lang=EN>fdi/preprobe </SPAN></FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">目录下所有匹配的文件。这个目录下的文件，典型的用途是通过设置</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">info.ignore</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">属性，禁止以后的其它操作，这么做的目的通常是为了绕过某些硬件</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">bug</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">或者忽略某些设备。但也不局限于此，凡是你希望在</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">HAL</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">对设备进行探测操作之前要处理的事情，都可以放在这里。</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><O:P></O:P></SPAN></FONT></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">而后，</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">HAL</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">调用</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">preprobe</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">中可能指定的</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">callout</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">做一些额外的预处理工作。</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><O:P></O:P></SPAN></FONT></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT 
face="Times New Roman">HAL</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">开始做实际的硬件探测工作</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><O:P></O:P></SPAN></FONT></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT 
face="Times New Roman">HAL</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">处理</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">fdi/information</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">目录下的所有相关文件。这里的文件的典型应用是添加一些设备相关的信息。比如，根据</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">bus</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">和</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT face="Times New Roman">vendorID 
</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">等信息匹配</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">USB</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">接口的某个品牌的</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">MP3</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">，添加其所支持的音频格式信息（相当于以配置文件的形式，人为的告知系统这个</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">MP3</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">支持什么格式）</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><O:P></O:P></SPAN></FONT></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT 
face="Times New Roman">HAL</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">处理</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">fdi/policy</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">目录下的所有相关文件。这里的文件的典型应用是关联设备对象可能对应需要的</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">Addon</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">和</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">Callout</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">，例如键盘设备可能会需要绑定一个名为</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">hald-addon-keyboard</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">的</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">addon<O:P></O:P></FONT></SPAN></FONT></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT 
face="Times New Roman">HAL</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">调用</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT face="Times New Roman">Callout 
</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">，通常来说</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">Callout</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">都是一些做</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">Probe</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">用途的程序，运行过就退出。</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><O:P></O:P></SPAN></FONT></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT 
face="Times New Roman">HAL</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">调用</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">Addon</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">，</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><FONT 
face="Times New Roman">Addon</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">通常是用来监听设备状态的服务进程，生命周期和设备的生命周期一致。</SPAN><SPAN 
lang=EN style="mso-ansi-language: EN"><O:P></O:P></SPAN></FONT></P>
<P class=MsoNormalIndent style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN lang=EN 
style="mso-ansi-language: EN"><FONT 
face="Times New Roman">HAL</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: EN">将设备对象暴露出来完成整个设备检测流程。</SPAN><SPAN 
lang=EN sty