doc/topics/sdk/usb/usb-host-interface-usb_hub_driver.html

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                        <div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/usb/usb-host-interface-usb_hub_driver.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">USB Hub Driver</h1><div class="date inPage">4 Feb 2024</div><div style="color: gray;">
                    Read time: 6 minute(s)
                </div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d295865e22__20250121171801"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_interface_usb_hub_driver__image_dns_14z_21c" src="../../../images/usb/usb_hub.png" alt="image3"/></div><br/></div><p class="- topic/p p" data-ofbid="d295865e26__20250121171801">普通的 Usb Device 通过内部的 Interface 提供各种业务功能。而 Hub 这类特殊的 Usb Device 功能就一种，那就是监控端口的状态变化：</p><ul class="- topic/ul ul" id="usb_host_interface_usb_hub_driver__ul_ens_14z_21c" data-ofbid="usb_host_interface_usb_hub_driver__ul_ens_14z_21c"><li class="- topic/li li" data-ofbid="d295865e29__20250121171801">
                <p class="- topic/p p" data-ofbid="d295865e31__20250121171801">在端口上有设备 attach 时，创建新的 usb device，给其适配驱动。如果是 hub device，子 usb 驱动会进一步扫描端口。</p>
            </li><li class="- topic/li li" data-ofbid="d295865e34__20250121171801">
                <p class="- topic/p p" data-ofbid="d295865e36__20250121171801">在端口上有设备 deattach 时，移除掉对应的 usb device。如果是 hub device 进一步移除其所有的子 usb device。</p>
            </li></ul><div class="- topic/p p" data-ofbid="d295865e39__20250121171801">Hub 也是标准的 Usb Device，它也是标准的流程被上一级设备发现后 <code class="+ topic/ph pr-d/codeph ph codeph">创建 Usb Device</code> → <code class="+ topic/ph pr-d/codeph ph codeph">创建 Usb
                Interface</code> ，然后被 <code class="+ topic/ph pr-d/codeph ph codeph">Usb Hub Interface</code> Driver 给适配到。系统中只有一个 Hub
            驱动：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_interface_usb_hub_driver__codeblock_abf_34z_21c" data-ofbid="usb_host_interface_usb_hub_driver__codeblock_abf_34z_21c"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> usb_device_id hub_id_table[] = {
    { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
                | USB_DEVICE_ID_MATCH_PRODUCT
                | USB_DEVICE_ID_MATCH_INT_CLASS,
    .idVendor = USB_VENDOR_SMSC,
    .idProduct = USB_PRODUCT_USB5534B,
    .bInterfaceClass = USB_CLASS_HUB,
    .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
    { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
            | USB_DEVICE_ID_MATCH_INT_CLASS,
    .idVendor = USB_VENDOR_GENESYS_LOGIC,
    .bInterfaceClass = USB_CLASS_HUB,
    .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND},
    { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
    .bDeviceClass = USB_CLASS_HUB},
    { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
    .bInterfaceClass = USB_CLASS_HUB},
    { }                                             <em class="hl-comment">/* Terminating entry */</em>
};

MODULE_DEVICE_TABLE(usb, hub_id_table);

<strong class="hl-keyword">static</strong> <strong class="hl-keyword">struct</strong> usb_driver hub_driver = {
    .name =         <span class="hl-string">"hub"</span>,
    .probe =        hub_probe,
    .disconnect =   hub_disconnect,
    .suspend =      hub_suspend,
    .resume =       hub_resume,
    .reset_resume = hub_reset_resume,
    .pre_reset =    hub_pre_reset,
    .post_reset =   hub_post_reset,
    .unlocked_ioctl = hub_ioctl,
    .id_table =     hub_id_table,
    .supports_autosuspend = <span class="hl-number">1</span>,
};</pre></div><p class="- topic/p p" data-ofbid="d295865e52__20250121171801">hub_driver 驱动启动以后，只做一件事情发送一个查询端口状态的 <code class="+ topic/ph pr-d/codeph ph codeph">urb</code> ：</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_interface_usb_hub_driver__pre_gns_14z_21c" data-ofbid="usb_host_interface_usb_hub_driver__pre_gns_14z_21c">hub_probe() → hub_configure():

<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> hub_configure(<strong class="hl-keyword">struct</strong> usb_hub *hub,
    <strong class="hl-keyword">struct</strong> usb_endpoint_descriptor *endpoint)
{

    <em class="hl-comment">/* (1) 分配 urb */</em>
    hub-&gt;urb = usb_alloc_urb(<span class="hl-number">0</span>, GFP_KERNEL);
    <strong class="hl-keyword">if</strong> (!hub-&gt;urb) {
        ret = -ENOMEM;
        <strong class="hl-keyword">goto</strong> fail;
    }

    <em class="hl-comment">/* (2) 初始化 urb，作用就是通过 ep0 查询 hub 的端口状态
            urb 的回调函数是 hub_irq()
    */</em>
    usb_fill_int_urb(hub-&gt;urb, hdev, pipe, *hub-&gt;buffer, maxp, hub_irq,
        hub, endpoint-&gt;bInterval);

    <em class="hl-comment">/* (3) 发送 urb */</em>
    hub_activate(hub, HUB_INIT);

}

↓

<strong class="hl-keyword">static</strong> <strong class="hl-keyword">void</strong> hub_activate(<strong class="hl-keyword">struct</strong> usb_hub *hub, <strong class="hl-keyword">enum</strong> hub_activation_type type)
{
    <em class="hl-comment">/*  (3.1) 提交 urb */</em>
    status = usb_submit_urb(hub-&gt;urb, GFP_NOIO);
}
</pre><section class="- topic/section section" id="usb_host_interface_usb_hub_driver__section_hns_14z_21c" data-ofbid="usb_host_interface_usb_hub_driver__section_hns_14z_21c"><h2 class="- topic/title title sectiontitle">Normal Hub Port op</h2>
            
            <p class="- topic/p p" data-ofbid="d295865e64__20250121171801">在普通的 hub 中，端口操作是通过标准的 urb 发起 usb ep0 读写。分为两类：</p>
            <ul class="- topic/ul ul" id="usb_host_interface_usb_hub_driver__ul_ins_14z_21c" data-ofbid="usb_host_interface_usb_hub_driver__ul_ins_14z_21c"><li class="- topic/li li" data-ofbid="d295865e68__20250121171801"><p class="- topic/p p" data-ofbid="d295865e69__20250121171801">通过轮询读取 <em class="+ topic/ph hi-d/i ph i">Hub Class-specific Requests</em> 配置来查询端口的状态：</p><div class="- topic/p p" data-ofbid="d295865e74__20250121171801"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_interface_usb_hub_driver__image_jns_14z_21c" src="../../../images/usb/usb_hub_get_port.png" alt="image4"/></div><br/></div></li><li class="- topic/li li" data-ofbid="d295865e78__20250121171801"><p class="- topic/p p" data-ofbid="d295865e79__20250121171801">设置和使能端口也是通过 <em class="+ topic/ph hi-d/i ph i">Hub Class-specific Requests</em> 中相应的命令实现的：</p><div class="- topic/p p" data-ofbid="d295865e84__20250121171801"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_host_interface_usb_hub_driver__image_lns_14z_21c" src="../../../images/usb/usb_hub_set_port.png" alt="image5"/></div><br/></div></li></ul>
        </section><section class="- topic/section section" id="usb_host_interface_usb_hub_driver__section_mns_14z_21c" data-ofbid="usb_host_interface_usb_hub_driver__section_mns_14z_21c"><h2 class="- topic/title title sectiontitle">RootHub Port op</h2>
            
            <p class="- topic/p p" data-ofbid="d295865e94__20250121171801">而对于 roothub 来说，对端口的操作的 urb 都需要特殊处理 (以 EHCI 的驱动为例)：</p>
            <ul class="- topic/ul ul" id="usb_host_interface_usb_hub_driver__ul_nns_14z_21c" data-ofbid="usb_host_interface_usb_hub_driver__ul_nns_14z_21c"><li class="- topic/li li" data-ofbid="d295865e98__20250121171801">
                    <div class="- topic/p p" data-ofbid="d295865e100__20250121171801">端口状态的变化可以通过 HCD
                        触发中断再上报：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_interface_usb_hub_driver__pre_ons_14z_21c" data-ofbid="usb_host_interface_usb_hub_driver__pre_ons_14z_21c">ehci_irq() → usb_hcd_poll_rh_status() :

<strong class="hl-keyword">void</strong> usb_hcd_poll_rh_status(<strong class="hl-keyword">struct</strong> usb_hcd *hcd)
{

    <em class="hl-comment">/* (1) 获取端口状态的变化 */</em>
    length = hcd-&gt;driver-&gt;hub_status_data(hcd, buffer);
    <strong class="hl-keyword">if</strong> (length &gt; <span class="hl-number">0</span>) {

        <em class="hl-comment">/* try to complete the status urb */</em>
        spin_lock_irqsave(&amp;hcd_root_hub_lock, flags);

        <em class="hl-comment">/* (2) 通过回复 hcd-&gt;status_urb 来进行上报 */</em>
        urb = hcd-&gt;status_urb;
        <strong class="hl-keyword">if</strong> (urb) {
            clear_bit(HCD_FLAG_POLL_PENDING, &amp;hcd-&gt;flags);
            hcd-&gt;status_urb = NULL;
            urb-&gt;actual_length = length;
            memcpy(urb-&gt;transfer_buffer, buffer, length);

            usb_hcd_unlink_urb_from_ep(hcd, urb);
            usb_hcd_giveback_urb(hcd, urb, <span class="hl-number">0</span>);
        } <strong class="hl-keyword">else</strong> {
            length = <span class="hl-number">0</span>;
            set_bit(HCD_FLAG_POLL_PENDING, &amp;hcd-&gt;flags);
        }
        spin_unlock_irqrestore(&amp;hcd_root_hub_lock, flags);
    }

}

↓

hcd-&gt;driver-&gt;hub_status_data() → ehci_hub_status_data():

<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong>
ehci_hub_status_data (<strong class="hl-keyword">struct</strong> usb_hcd *hcd, <strong class="hl-keyword">char</strong> *buf)
{
    <em class="hl-comment">/* (1.1) 通过 HCD 驱动，获取 roothub 端口的状态 */</em>
}
</pre></div>
                </li><li class="- topic/li li" data-ofbid="d295865e105__20250121171801">
                    <div class="- topic/p p" data-ofbid="d295865e107__20250121171801">设置和使能端口需要嫁接到 HCD
                        驱动相关函数上实现：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_interface_usb_hub_driver__pre_qns_14z_21c" data-ofbid="usb_host_interface_usb_hub_driver__pre_qns_14z_21c">usb_hcd_submit_urb() → rh_urb_enqueue() → rh_call_control() → hcd-&gt;driver-&gt;hub_control() → ehci_hub_control():

<strong class="hl-keyword">int</strong> ehci_hub_control(
    <strong class="hl-keyword">struct</strong> usb_hcd  *hcd,
    u16             typeReq,
    u16             wValue,
    u16             wIndex,
    <strong class="hl-keyword">char</strong>            *buf,
    u16             wLength
) {
    <em class="hl-comment">/* (1) 通过 HCD 驱动，设置 roothub 的端口 */</em>
}
</pre></div>
                </li></ul>
        </section><section class="- topic/section section" id="usb_host_interface_usb_hub_driver__section_j4w_y4z_21c" data-ofbid="usb_host_interface_usb_hub_driver__section_j4w_y4z_21c"><h2 class="- topic/title title sectiontitle">Device Attach</h2>
            
            <div class="- topic/p p" data-ofbid="d295865e118__20250121171801">
                <pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_interface_usb_hub_driver__pre_rns_14z_21c" data-ofbid="usb_host_interface_usb_hub_driver__pre_rns_14z_21c">hub_event() → port_event() → hub_port_connect_change() → hub_port_connect():

<strong class="hl-keyword">static</strong> <strong class="hl-keyword">void</strong> hub_port_connect(<strong class="hl-keyword">struct</strong> usb_hub *hub, <strong class="hl-keyword">int</strong> port1, u16 portstatus,
        u16 portchange)
{

    <strong class="hl-keyword">for</strong> (i = <span class="hl-number">0</span>; i &lt; PORT_INIT_TRIES; i++) {

        <em class="hl-comment">/* (1) 给端口上新 Device 分配 `struct usb_device` 数据结构 */</em>
        udev = usb_alloc_dev(hdev, hdev-&gt;bus, port1);
        <strong class="hl-keyword">if</strong> (!udev) {
            dev_err(&amp;port_dev-&gt;dev,
                    <span class="hl-string">"couldn't allocate usb_device\n"</span>);
            <strong class="hl-keyword">goto</strong> done;
        }

        <em class="hl-comment">/* (2) 给新的 Device 分配一个新的 Address */</em>
        choose_devnum(udev);
        <strong class="hl-keyword">if</strong> (udev-&gt;devnum &lt;= <span class="hl-number">0</span>) {
            status = -ENOTCONN;     <em class="hl-comment">/* Don't retry */</em>
            <strong class="hl-keyword">goto</strong> loop;
        }

        <em class="hl-comment">/* reset (non-USB 3.0 devices) and get descriptor */</em>
        usb_lock_port(port_dev);
        <em class="hl-comment">/* (3) 使能端口，并且调用 hub_set_address() 给 Device 配置上新分配的 Address */</em>
        status = hub_port_init(hub, udev, port1, i);
        usb_unlock_port(port_dev);

        <em class="hl-comment">/* (4) 注册 `struct usb_device` */</em>
            status = usb_new_device(udev);

    }

}
</pre>
            </div>
        </section><section class="- topic/section section" id="usb_host_interface_usb_hub_driver__section_xzh_z4z_21c" data-ofbid="usb_host_interface_usb_hub_driver__section_xzh_z4z_21c"><h2 class="- topic/title title sectiontitle">Device Deattach</h2>
            
            <div class="- topic/p p" data-ofbid="d295865e129__20250121171801">
                <pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_interface_usb_hub_driver__pre_sns_14z_21c" data-ofbid="usb_host_interface_usb_hub_driver__pre_sns_14z_21c">hub_event() → port_event() → hub_port_connect_change() → hub_port_connect():

<strong class="hl-keyword">static</strong> <strong class="hl-keyword">void</strong> hub_port_connect(<strong class="hl-keyword">struct</strong> usb_hub *hub, <strong class="hl-keyword">int</strong> port1, u16 portstatus,
        u16 portchange)
{

    <em class="hl-comment">/* (1) 移除端口上的 `struct usb_device` */</em>
    <strong class="hl-keyword">if</strong> (udev) {
        <strong class="hl-keyword">if</strong> (hcd-&gt;usb_phy &amp;&amp; !hdev-&gt;parent)
            usb_phy_notify_disconnect(hcd-&gt;usb_phy, udev-&gt;speed);
        usb_disconnect(&amp;port_dev-&gt;child);
    }

}
</pre>
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	                            <div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#usb_host_interface_usb_hub_driver__section_hns_14z_21c" data-tocid="usb_host_interface_usb_hub_driver__section_hns_14z_21c">Normal Hub Port op</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_host_interface_usb_hub_driver__section_mns_14z_21c" data-tocid="usb_host_interface_usb_hub_driver__section_mns_14z_21c">RootHub Port op</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_host_interface_usb_hub_driver__section_j4w_y4z_21c" data-tocid="usb_host_interface_usb_hub_driver__section_j4w_y4z_21c">Device Attach</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_host_interface_usb_hub_driver__section_xzh_z4z_21c" data-tocid="usb_host_interface_usb_hub_driver__section_xzh_z4z_21c">Device Deattach</a></div></li></ul></div>
	                        	
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            </div>
            
            
            
        </div> 
        <footer class="navbar navbar-default wh_footer">
  <div class=" footer-container mx-auto ">
    <title>footer def</title>
    <style><!--

.p1 {
  font-family: FangZhengShuSong, Times, serif;
}
.p2 {
  font-family: Arial, Helvetica, sans-serif;
}
.p3 {
  font-family: "Lucida Console", "Courier New", monospace;
}
    
--></style>
  

  
    
  
  
    
            
   
  

  <div class="webhelp.fragment.footer">
    <p class="p1">Copyright © 2019-2024 广东匠芯创科技有限公司. All rights reserved.</p>
  </div><div>
    <div class="generation_time">
      Update Time: 2025-01-21
    </div>        
  </div>
  </div>
</footer>
        
        <div id="go2top" class="d-print-none">
            <span class="oxy-icon oxy-icon-up"></span>
        </div>
        
        <div id="modal_img_large" class="modal">
            <span class="close oxy-icon oxy-icon-remove"></span>
            <div id="modal_img_container"></div>
            <div id="caption"></div>
        </div>
        
        
    <script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>

        
    </body>
</html>