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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;">
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Read time: 6 minute(s)
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</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">
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<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>
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</li><li class="- topic/li li" data-ofbid="d295865e34__20250121171801">
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<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>
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</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
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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
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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[] = {
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{ .match_flags = USB_DEVICE_ID_MATCH_VENDOR
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| USB_DEVICE_ID_MATCH_PRODUCT
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| USB_DEVICE_ID_MATCH_INT_CLASS,
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.idVendor = USB_VENDOR_SMSC,
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.idProduct = USB_PRODUCT_USB5534B,
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.bInterfaceClass = USB_CLASS_HUB,
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.driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
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{ .match_flags = USB_DEVICE_ID_MATCH_VENDOR
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| USB_DEVICE_ID_MATCH_INT_CLASS,
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.idVendor = USB_VENDOR_GENESYS_LOGIC,
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.bInterfaceClass = USB_CLASS_HUB,
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.driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND},
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{ .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
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.bDeviceClass = USB_CLASS_HUB},
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{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
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.bInterfaceClass = USB_CLASS_HUB},
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{ } <em class="hl-comment">/* Terminating entry */</em>
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};
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MODULE_DEVICE_TABLE(usb, hub_id_table);
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">struct</strong> usb_driver hub_driver = {
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.name = <span class="hl-string">"hub"</span>,
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.probe = hub_probe,
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.disconnect = hub_disconnect,
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.suspend = hub_suspend,
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.resume = hub_resume,
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.reset_resume = hub_reset_resume,
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.pre_reset = hub_pre_reset,
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.post_reset = hub_post_reset,
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.unlocked_ioctl = hub_ioctl,
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.id_table = hub_id_table,
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.supports_autosuspend = <span class="hl-number">1</span>,
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};</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():
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> hub_configure(<strong class="hl-keyword">struct</strong> usb_hub *hub,
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<strong class="hl-keyword">struct</strong> usb_endpoint_descriptor *endpoint)
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{
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<em class="hl-comment">/* (1) 分配 urb */</em>
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hub->urb = usb_alloc_urb(<span class="hl-number">0</span>, GFP_KERNEL);
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<strong class="hl-keyword">if</strong> (!hub->urb) {
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ret = -ENOMEM;
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<strong class="hl-keyword">goto</strong> fail;
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}
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<em class="hl-comment">/* (2) 初始化 urb，作用就是通过 ep0 查询 hub 的端口状态
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urb 的回调函数是 hub_irq()
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*/</em>
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usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
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hub, endpoint->bInterval);
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<em class="hl-comment">/* (3) 发送 urb */</em>
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hub_activate(hub, HUB_INIT);
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}
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↓
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<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)
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{
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<em class="hl-comment">/* (3.1) 提交 urb */</em>
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status = usb_submit_urb(hub->urb, GFP_NOIO);
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}
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</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>
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<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>
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<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>
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</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>
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<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>
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<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">
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<div class="- topic/p p" data-ofbid="d295865e100__20250121171801">端口状态的变化可以通过 HCD
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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() :
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||
|
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<strong class="hl-keyword">void</strong> usb_hcd_poll_rh_status(<strong class="hl-keyword">struct</strong> usb_hcd *hcd)
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{
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<em class="hl-comment">/* (1) 获取端口状态的变化 */</em>
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length = hcd->driver->hub_status_data(hcd, buffer);
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<strong class="hl-keyword">if</strong> (length > <span class="hl-number">0</span>) {
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||
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<em class="hl-comment">/* try to complete the status urb */</em>
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||
spin_lock_irqsave(&hcd_root_hub_lock, flags);
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||
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<em class="hl-comment">/* (2) 通过回复 hcd->status_urb 来进行上报 */</em>
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||
urb = hcd->status_urb;
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||
<strong class="hl-keyword">if</strong> (urb) {
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||
clear_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
|
||
hcd->status_urb = NULL;
|
||
urb->actual_length = length;
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||
memcpy(urb->transfer_buffer, buffer, length);
|
||
|
||
usb_hcd_unlink_urb_from_ep(hcd, urb);
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||
usb_hcd_giveback_urb(hcd, urb, <span class="hl-number">0</span>);
|
||
} <strong class="hl-keyword">else</strong> {
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||
length = <span class="hl-number">0</span>;
|
||
set_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
|
||
}
|
||
spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
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||
}
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||
|
||
}
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||
|
||
↓
|
||
|
||
hcd->driver->hub_status_data() → ehci_hub_status_data():
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||
|
||
<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>
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||
</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->driver->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>
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||
|
||
<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)
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||
{
|
||
|
||
<strong class="hl-keyword">for</strong> (i = <span class="hl-number">0</span>; i < PORT_INIT_TRIES; i++) {
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||
|
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<em class="hl-comment">/* (1) 给端口上新 Device 分配 `struct usb_device` 数据结构 */</em>
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||
udev = usb_alloc_dev(hdev, hdev->bus, port1);
|
||
<strong class="hl-keyword">if</strong> (!udev) {
|
||
dev_err(&port_dev->dev,
|
||
<span class="hl-string">"couldn't allocate usb_device\n"</span>);
|
||
<strong class="hl-keyword">goto</strong> done;
|
||
}
|
||
|
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<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->devnum <= <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->usb_phy && !hdev->parent)
|
||
usb_phy_notify_disconnect(hcd->usb_phy, udev->speed);
|
||
usb_disconnect(&port_dev->child);
|
||
}
|
||
|
||
}
|
||
</pre>
|
||
</div>
|
||
</section></div></article></main></div>
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|
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|
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|
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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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