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<section id="vendor-host">
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<h1>vendor host 驱动编写<a class="headerlink" href="#vendor-host" title="Link to this heading"></a></h1>
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<p>本节主要介绍如何编写一个 vendor host 驱动。</p>
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<ul class="simple">
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<li><p>首先复制一份 class/template/usbh_xxx.c 文件</p></li>
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<li><p>定义 class 驱动并使用 CLASS_INFO_DEFINE 前缀，这样，枚举完成后，协议栈自动通过 usbd_class_find_driver 来查找对应的驱动。</p></li>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="k">static</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_class_driver</span><span class="w"> </span><span class="n">xxx_class_driver</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="p">.</span><span class="n">driver_name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"xxx"</span><span class="p">,</span>
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<span class="w"> </span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">usbh_xxx_connect</span><span class="p">,</span>
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<span class="w"> </span><span class="p">.</span><span class="n">disconnect</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">usbh_xxx_disconnect</span>
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<span class="p">};</span>
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<span class="n">CLASS_INFO_DEFINE</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_class_info</span><span class="w"> </span><span class="n">xxx_class_info</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="p">.</span><span class="n">match_flags</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">USB_CLASS_MATCH_INTF_CLASS</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">USB_CLASS_MATCH_INTF_SUBCLASS</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">USB_CLASS_MATCH_INTF_PROTOCOL</span><span class="p">,</span>
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<span class="w"> </span><span class="p">.</span><span class="n">bInterfaceClass</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span>
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<span class="w"> </span><span class="p">.</span><span class="n">bInterfaceSubClass</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span>
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<span class="w"> </span><span class="p">.</span><span class="n">bInterfaceProtocol</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span>
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<span class="w"> </span><span class="p">.</span><span class="n">id_table</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">NULL</span><span class="p">,</span>
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<span class="w"> </span><span class="p">.</span><span class="n">class_driver</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">&</span><span class="n">xxx_class_driver</span>
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<span class="p">};</span>
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</pre></div>
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</div>
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<ul class="simple">
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<li><p>实现 connect 和 disconnect 函数, 在 connect 函数中，需要分配一个 xxx_class 结构体，在 disconnect 函数中释放 urb 和 xxx_class。</p></li>
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</ul>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_xxx</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_hubport</span><span class="w"> </span><span class="o">*</span><span class="n">hport</span><span class="p">;</span>
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<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usb_endpoint_descriptor</span><span class="w"> </span><span class="o">*</span><span class="n">xxxin</span><span class="p">;</span>
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<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usb_endpoint_descriptor</span><span class="w"> </span><span class="o">*</span><span class="n">xxxout</span><span class="p">;</span>
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<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_urb</span><span class="w"> </span><span class="n">xxxin_urb</span><span class="p">;</span>
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<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_urb</span><span class="w"> </span><span class="n">xxxout_urb</span><span class="p">;</span>
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<span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">intf</span><span class="p">;</span><span class="w"> </span><span class="cm">/* interface number */</span>
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<span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">minor</span><span class="p">;</span>
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<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">user_data</span><span class="p">;</span>
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<span class="p">};</span>
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<span class="k">static</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">usbh_xxx_connect</span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_hubport</span><span class="w"> </span><span class="o">*</span><span class="n">hport</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">intf</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usb_endpoint_descriptor</span><span class="w"> </span><span class="o">*</span><span class="n">ep_desc</span><span class="p">;</span>
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<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">ret</span><span class="p">;</span>
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<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_xxx</span><span class="w"> </span><span class="o">*</span><span class="n">xxx_class</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">usbh_xxx_class_alloc</span><span class="p">();</span>
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<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">xxx_class</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="nb">NULL</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="n">USB_LOG_ERR</span><span class="p">(</span><span class="s">"Fail to alloc xxx_class</span><span class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
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<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="o">-</span><span class="n">USB_ERR_NOMEM</span><span class="p">;</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">ret</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">static</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">usbh_xxx_disconnect</span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_hubport</span><span class="w"> </span><span class="o">*</span><span class="n">hport</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">intf</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">ret</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
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<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_xxx</span><span class="w"> </span><span class="o">*</span><span class="n">xxx_class</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_xxx</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="n">hport</span><span class="o">-></span><span class="n">config</span><span class="p">.</span><span class="n">intf</span><span class="p">[</span><span class="n">intf</span><span class="p">].</span><span class="n">priv</span><span class="p">;</span>
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|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">xxx_class</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">xxx_class</span><span class="o">-></span><span class="n">xxxin</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">usbh_kill_urb</span><span class="p">(</span><span class="o">&</span><span class="n">xxx_class</span><span class="o">-></span><span class="n">xxxin_urb</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">xxx_class</span><span class="o">-></span><span class="n">xxxout</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">usbh_kill_urb</span><span class="p">(</span><span class="o">&</span><span class="n">xxx_class</span><span class="o">-></span><span class="n">xxxout_urb</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">hport</span><span class="o">-></span><span class="n">config</span><span class="p">.</span><span class="n">intf</span><span class="p">[</span><span class="n">intf</span><span class="p">].</span><span class="n">devname</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="sc">'\0'</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">USB_LOG_INFO</span><span class="p">(</span><span class="s">"Unregister xxx Class:%s</span><span class="se">\r\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">hport</span><span class="o">-></span><span class="n">config</span><span class="p">.</span><span class="n">intf</span><span class="p">[</span><span class="n">intf</span><span class="p">].</span><span class="n">devname</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="n">usbh_xxx_stop</span><span class="p">(</span><span class="n">xxx_class</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
|
||
<span class="w"> </span><span class="n">usbh_xxx_class_free</span><span class="p">(</span><span class="n">xxx_class</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
|
||
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">ret</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<ul class="simple">
|
||
<li><p>初始化端点</p></li>
|
||
</ul>
|
||
<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">hport</span><span class="o">-></span><span class="n">config</span><span class="p">.</span><span class="n">intf</span><span class="p">[</span><span class="n">intf</span><span class="p">].</span><span class="n">altsetting</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="n">intf_desc</span><span class="p">.</span><span class="n">bNumEndpoints</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">ep_desc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">&</span><span class="n">hport</span><span class="o">-></span><span class="n">config</span><span class="p">.</span><span class="n">intf</span><span class="p">[</span><span class="n">intf</span><span class="p">].</span><span class="n">altsetting</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="n">ep</span><span class="p">[</span><span class="n">i</span><span class="p">].</span><span class="n">ep_desc</span><span class="p">;</span>
|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">ep_desc</span><span class="o">-></span><span class="n">bEndpointAddress</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="mh">0x80</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">USBH_EP_INIT</span><span class="p">(</span><span class="n">xxx_class</span><span class="o">-></span><span class="n">intin</span><span class="p">,</span><span class="w"> </span><span class="n">ep_desc</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">USBH_EP_INIT</span><span class="p">(</span><span class="n">xxx_class</span><span class="o">-></span><span class="n">intout</span><span class="p">,</span><span class="w"> </span><span class="n">ep_desc</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<ul class="simple">
|
||
<li><p>最后设计收发 API，根据实际情况设计成同步 or 异步。</p></li>
|
||
</ul>
|
||
<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span><span class="w"> </span><span class="nf">usbh_xxx_in_transfer</span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_xxx</span><span class="w"> </span><span class="o">*</span><span class="n">xxx_class</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="o">*</span><span class="n">buffer</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">buflen</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">timeout</span><span class="p">)</span>
|
||
<span class="p">{</span>
|
||
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">ret</span><span class="p">;</span>
|
||
<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_urb</span><span class="w"> </span><span class="o">*</span><span class="n">urb</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">&</span><span class="n">xxx_class</span><span class="o">-></span><span class="n">xxxin_urb</span><span class="p">;</span>
|
||
|
||
<span class="w"> </span><span class="n">usbh_xxx_urb_fill</span><span class="p">(</span><span class="n">urb</span><span class="p">,</span><span class="w"> </span><span class="n">xxx_class</span><span class="o">-></span><span class="n">hport</span><span class="p">,</span><span class="w"> </span><span class="n">xxx_class</span><span class="o">-></span><span class="n">xxxin</span><span class="p">,</span><span class="w"> </span><span class="n">buffer</span><span class="p">,</span><span class="w"> </span><span class="n">buflen</span><span class="p">,</span><span class="w"> </span><span class="n">timeout</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="n">ret</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">usbh_submit_urb</span><span class="p">(</span><span class="n">urb</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">ret</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">ret</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">urb</span><span class="o">-></span><span class="n">actual_length</span><span class="p">;</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">ret</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="kt">int</span><span class="w"> </span><span class="nf">usbh_xxx_out_transfer</span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_xxx</span><span class="w"> </span><span class="o">*</span><span class="n">xxx_class</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="o">*</span><span class="n">buffer</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">buflen</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">timeout</span><span class="p">)</span>
|
||
<span class="p">{</span>
|
||
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">ret</span><span class="p">;</span>
|
||
<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_urb</span><span class="w"> </span><span class="o">*</span><span class="n">urb</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">&</span><span class="n">xxx_class</span><span class="o">-></span><span class="n">xxxout_urb</span><span class="p">;</span>
|
||
|
||
<span class="w"> </span><span class="n">usbh_xxx_urb_fill</span><span class="p">(</span><span class="n">urb</span><span class="p">,</span><span class="w"> </span><span class="n">xxx_class</span><span class="o">-></span><span class="n">hport</span><span class="p">,</span><span class="w"> </span><span class="n">xxx_class</span><span class="o">-></span><span class="n">xxxout</span><span class="p">,</span><span class="w"> </span><span class="n">buffer</span><span class="p">,</span><span class="w"> </span><span class="n">buflen</span><span class="p">,</span><span class="w"> </span><span class="n">timeout</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="n">ret</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">usbh_submit_urb</span><span class="p">(</span><span class="n">urb</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">ret</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">ret</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">urb</span><span class="o">-></span><span class="n">actual_length</span><span class="p">;</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">ret</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
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||
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