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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-device_layer.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">USB Device Layer</h1><div class="date inPage">24 Jan 2024</div><div style="color: gray;">
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Read time: 7 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="usb_host_device_layer__section_jvl_xnz_21c" data-ofbid="usb_host_device_layer__section_jvl_xnz_21c"><h2 class="- topic/title title sectiontitle">Device (struct usb_device)</h2>
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<p class="- topic/p p" data-ofbid="d319951e27__20250121171824"><code class="+ topic/ph pr-d/codeph ph codeph">USB Device</code> Device 对应的数据结构为 <code class="+ topic/ph pr-d/codeph ph codeph">struct usb_device</code>
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，会在两种情况下被创建：</p>
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<ul class="- topic/ul ul" id="usb_host_device_layer__ul_kvl_xnz_21c" data-ofbid="usb_host_device_layer__ul_kvl_xnz_21c"><li class="- topic/li li" data-ofbid="d319951e36__20250121171824">
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<p class="- topic/p p" data-ofbid="d319951e38__20250121171824">roothub device。在 HCD 驱动注册时创建：</p>
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</li></ul>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_device_layer__pre_lvl_xnz_21c" data-ofbid="usb_host_device_layer__pre_lvl_xnz_21c"><em class="hl-comment">/* (1) 首先创建和初始化 `usb_device` 结构： */</em>
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usb_add_hcd() → usb_alloc_dev():
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<strong class="hl-keyword">struct</strong> usb_device *usb_alloc_dev(<strong class="hl-keyword">struct</strong> usb_device *parent,
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<strong class="hl-keyword">struct</strong> usb_bus *bus, <strong class="hl-keyword">unsigned</strong> port1)
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{
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<em class="hl-comment">/* (1.1) dev 总线初始化为 usb_bus_type */</em>
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dev->dev.bus = &usb_bus_type;
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<em class="hl-comment">/* (1.2) dev 类型初始化为 usb_device_type，标明自己是一个 usb device */</em>
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dev->dev.type = &usb_device_type;
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dev->dev.groups = usb_device_groups;
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}
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<em class="hl-comment">/* (2) 然后注册 `usb_device` 结构： */</em>
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usb_add_hcd() → register_root_hub() → usb_new_device() → device_add()
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</pre>
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<ul class="- topic/ul ul" id="usb_host_device_layer__ul_mvl_xnz_21c" data-ofbid="usb_host_device_layer__ul_mvl_xnz_21c"><li class="- topic/li li" data-ofbid="d319951e46__20250121171824">
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<p class="- topic/p p" data-ofbid="d319951e48__20250121171824">普通 usb device。在 Hub 检测到端口有设备 attach 时创建：</p>
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</li></ul>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_device_layer__pre_nvl_xnz_21c" data-ofbid="usb_host_device_layer__pre_nvl_xnz_21c"><em class="hl-comment">/* (1) 首先创建和初始化 `usb_device` 结构： */</em>
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hub_event() → port_event() → hub_port_connect_change() → hub_port_connect() → usb_alloc_dev()
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<em class="hl-comment">/* (2) 然后注册 `usb_device` 结构： */</em>
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hub_event() → port_event() → hub_port_connect_change() → hub_port_connect() → usb_new_device() → device_add()
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</pre>
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</section><section class="- topic/section section" id="usb_host_device_layer__section_ovl_xnz_21c" data-ofbid="usb_host_device_layer__section_ovl_xnz_21c"><h2 class="- topic/title title sectiontitle">Driver (struct usb_device_driver)</h2>
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<p class="- topic/p p" data-ofbid="d319951e61__20250121171824"><code class="+ topic/ph pr-d/codeph ph codeph">USB Device</code> Driver 对应的数据结构为 <code class="+ topic/ph pr-d/codeph ph codeph">struct
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usb_device_driver</code>，使用 <code class="+ topic/ph pr-d/codeph ph codeph">usb_register_device_driver()</code>
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函数进行注册：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_device_layer__pre_pvl_xnz_21c" data-ofbid="usb_host_device_layer__pre_pvl_xnz_21c"><strong class="hl-keyword">int</strong> usb_register_device_driver(<strong class="hl-keyword">struct</strong> usb_device_driver *new_udriver,
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<strong class="hl-keyword">struct</strong> module *owner)
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{
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<em class="hl-comment">/* (1) 设置 devices 标志为 1，表面这个驱动时给 usb device 使用的 */</em>
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new_udriver->drvwrap.for_devices = <span class="hl-number">1</span>;
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new_udriver->drvwrap.driver.name = new_udriver->name;
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new_udriver->drvwrap.driver.bus = &usb_bus_type;
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new_udriver->drvwrap.driver.probe = usb_probe_device;
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new_udriver->drvwrap.driver.remove = usb_unbind_device;
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new_udriver->drvwrap.driver.owner = owner;
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new_udriver->drvwrap.driver.dev_groups = new_udriver->dev_groups;
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retval = driver_register(&new_udriver->drvwrap.driver);
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}
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</pre>
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<p class="- topic/p p" data-ofbid="d319951e75__20250121171824">注册的 <code class="+ topic/ph pr-d/codeph ph codeph">USB Device</code> Driver 驱动非常少，一般情况下所有的 <code class="+ topic/ph pr-d/codeph ph codeph">USB Device</code>
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Device 都会适配到 <code class="+ topic/ph pr-d/codeph ph codeph">usb_generic_driver</code>。因为这一层次驱动的目的很单纯，就是给 <code class="+ topic/ph pr-d/codeph ph codeph">USB
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Device</code> 下所有的 <code class="+ topic/ph pr-d/codeph ph codeph">Interface</code> 创建对应的 <code class="+ topic/ph pr-d/codeph ph codeph">USB
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Interface</code> Device。</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_device_layer__pre_qvl_xnz_21c" data-ofbid="usb_host_device_layer__pre_qvl_xnz_21c">usb_init() → usb_register_device_driver() :
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> __init usb_init(<strong class="hl-keyword">void</strong>)
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{
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retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE);
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}
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<strong class="hl-keyword">struct</strong> usb_device_driver usb_generic_driver = {
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.name = <span class="hl-string">"usb"</span>,
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.match = usb_generic_driver_match,
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.probe = usb_generic_driver_probe,
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.disconnect = usb_generic_driver_disconnect,
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#ifdef CONFIG_PM
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.suspend = usb_generic_driver_suspend,
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.resume = usb_generic_driver_resume,
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#endif
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.supports_autosuspend = <span class="hl-number">1</span>,
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};
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</pre>
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<p class="- topic/p p" data-ofbid="d319951e101__20250121171824">驱动 probe() 过程：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_device_layer__pre_rvl_xnz_21c" data-ofbid="usb_host_device_layer__pre_rvl_xnz_21c">usb_probe_device() → usb_generic_driver_probe() → usb_set_configuration():
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<strong class="hl-keyword">int</strong> usb_set_configuration(<strong class="hl-keyword">struct</strong> usb_device *dev, <strong class="hl-keyword">int</strong> configuration)
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{
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<em class="hl-comment">/* (1) 创建和初始化 `struct usb_interface` */</em>
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<strong class="hl-keyword">for</strong> (i = <span class="hl-number">0</span>; i < nintf; ++i) {
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<em class="hl-comment">/* (1.1) dev 总线初始化为 usb_bus_type */</em>
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intf->dev.bus = &usb_bus_type;
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<em class="hl-comment">/* (1.2) dev 类型初始化为 usb_if_device_type，标明自己是一个 usb interface */</em>
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intf->dev.type = &usb_if_device_type;
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intf->dev.groups = usb_interface_groups;
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}
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<em class="hl-comment">/* (2) 注册 `struct usb_interface` */</em>
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<strong class="hl-keyword">for</strong> (i = <span class="hl-number">0</span>; i < nintf; ++i) {
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ret = device_add(&intf->dev);
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}
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}
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</pre>
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</section><section class="- topic/section section" id="usb_host_device_layer__section_svl_xnz_21c" data-ofbid="usb_host_device_layer__section_svl_xnz_21c"><h2 class="- topic/title title sectiontitle">Bus (usb_bus_type)</h2>
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<p class="- topic/p p" data-ofbid="d319951e112__20250121171824">可以看到 <code class="+ topic/ph pr-d/codeph ph codeph">struct usb_device</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">struct usb_interface</code>
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使用的总线都是 <code class="+ topic/ph pr-d/codeph ph codeph">usb_bus_type</code>。他们是通过字段 <code class="+ topic/ph pr-d/codeph ph codeph">dev.type</code> 来区分的：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_device_layer__pre_tvl_xnz_21c" data-ofbid="usb_host_device_layer__pre_tvl_xnz_21c"><em class="hl-comment">/* (1) `struct usb_device` 的 `dev.type` 值为 `usb_device_type`： */</em>
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usb_add_hcd() → usb_alloc_dev():
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<strong class="hl-keyword">struct</strong> usb_device *usb_alloc_dev(<strong class="hl-keyword">struct</strong> usb_device *parent,
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<strong class="hl-keyword">struct</strong> usb_bus *bus, <strong class="hl-keyword">unsigned</strong> port1)
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{
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dev->dev.type = &usb_device_type;
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}
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<em class="hl-comment">/* (2) `struct usb_interface` 的 `dev.type` 值为 `usb_if_device_type` */</em>
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usb_probe_device() → usb_generic_driver_probe() → usb_set_configuration():
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<strong class="hl-keyword">int</strong> usb_set_configuration(<strong class="hl-keyword">struct</strong> usb_device *dev, <strong class="hl-keyword">int</strong> configuration)
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||
{
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||
<strong class="hl-keyword">for</strong> (i = <span class="hl-number">0</span>; i < nintf; ++i) {
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||
intf->dev.type = &usb_if_device_type;
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||
}
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||
}
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">inline</strong> <strong class="hl-keyword">int</strong> is_usb_device(<strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> device *dev)
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{
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<em class="hl-comment">/* (3) 判断当前 Device 是否为 Usb Device */</em>
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||
<strong class="hl-keyword">return</strong> dev->type == &usb_device_type;
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||
}
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||
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">inline</strong> <strong class="hl-keyword">int</strong> is_usb_interface(<strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> device *dev)
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||
{
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<em class="hl-comment">/* (4) 判断当前 Device 是否为 Usb Interface */</em>
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<strong class="hl-keyword">return</strong> dev->type == &usb_if_device_type;
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}
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</pre>
|
||
<p class="- topic/p p" data-ofbid="d319951e130__20250121171824">另外 <code class="+ topic/ph pr-d/codeph ph codeph">struct usb_device_driver</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">struct usb_driver</code>
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||
使用的总线都是 <code class="+ topic/ph pr-d/codeph ph codeph">usb_bus_type</code>。他们是通过字段 <code class="+ topic/ph pr-d/codeph ph codeph">drvwrap.for_devices</code>
|
||
来区分的：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_device_layer__pre_uvl_xnz_21c" data-ofbid="usb_host_device_layer__pre_uvl_xnz_21c"><em class="hl-comment">/* (1) `struct usb_device_driver` 的 `drvwrap.for_devices` 值为 1： */</em>
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<strong class="hl-keyword">int</strong> usb_register_device_driver(<strong class="hl-keyword">struct</strong> usb_device_driver *new_udriver,
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<strong class="hl-keyword">struct</strong> module *owner)
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||
{
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new_udriver->drvwrap.for_devices = <span class="hl-number">1</span>;
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}
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<em class="hl-comment">/* (2) `struct usb_driver` 的 `drvwrap.for_devices` 值为 0： */</em>
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<strong class="hl-keyword">int</strong> usb_register_driver(<strong class="hl-keyword">struct</strong> usb_driver *new_driver, <strong class="hl-keyword">struct</strong> module *owner,
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<strong class="hl-keyword">const</strong> <strong class="hl-keyword">char</strong> *mod_name)
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{
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new_driver->drvwrap.for_devices = <span class="hl-number">0</span>;
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}
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<em class="hl-comment">/* (3) 判断当前 Driver 是适配 Usb Device 还是 Usb Interface */</em>
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">inline</strong> <strong class="hl-keyword">int</strong> is_usb_device_driver(<strong class="hl-keyword">struct</strong> device_driver *drv)
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||
{
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<strong class="hl-keyword">return</strong> container_of(drv, <strong class="hl-keyword">struct</strong> usbdrv_wrap, driver)->
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for_devices;
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}
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</pre>
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<p class="- topic/p p" data-ofbid="d319951e149__20250121171824">在 <code class="+ topic/ph pr-d/codeph ph codeph">usb_bus_type</code> 的 <code class="+ topic/ph pr-d/codeph ph codeph">match()</code> 函数中利用
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<code class="+ topic/ph pr-d/codeph ph codeph">dev.type</code> 进行判别分开处理：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_host_device_layer__pre_vvl_xnz_21c" data-ofbid="usb_host_device_layer__pre_vvl_xnz_21c"><strong class="hl-keyword">struct</strong> bus_type usb_bus_type = {
|
||
.name = <span class="hl-string">"usb"</span>,
|
||
.match = usb_device_match,
|
||
.uevent = usb_uevent,
|
||
.need_parent_lock = true,
|
||
};
|
||
|
||
<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> usb_device_match(<strong class="hl-keyword">struct</strong> device *dev, <strong class="hl-keyword">struct</strong> device_driver *drv)
|
||
{
|
||
<em class="hl-comment">/* devices and interfaces are handled separately */</em>
|
||
<em class="hl-comment">/* (1) Device 是 `Usb Device` 的处理 */</em>
|
||
<strong class="hl-keyword">if</strong> (is_usb_device(dev)) {
|
||
<strong class="hl-keyword">struct</strong> usb_device *udev;
|
||
<strong class="hl-keyword">struct</strong> usb_device_driver *udrv;
|
||
|
||
<em class="hl-comment">/* interface drivers never match devices */</em>
|
||
<em class="hl-comment">/* (1.1) 只查找 `Usb Device` 的 Driver */</em>
|
||
<strong class="hl-keyword">if</strong> (!is_usb_device_driver(drv))
|
||
<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
|
||
|
||
udev = to_usb_device(dev);
|
||
udrv = to_usb_device_driver(drv);
|
||
|
||
<em class="hl-comment">/* If the device driver under consideration does not have a
|
||
* id_table or a match function, then let the driver's probe
|
||
* function decide.
|
||
*/</em>
|
||
<strong class="hl-keyword">if</strong> (!udrv->id_table && !udrv->match)
|
||
<strong class="hl-keyword">return</strong> <span class="hl-number">1</span>;
|
||
|
||
<strong class="hl-keyword">return</strong> usb_driver_applicable(udev, udrv);
|
||
|
||
<em class="hl-comment">/* (2) Device 是 `Usb Interface` 的处理 */</em>
|
||
} <strong class="hl-keyword">else</strong> <strong class="hl-keyword">if</strong> (is_usb_interface(dev)) {
|
||
<strong class="hl-keyword">struct</strong> usb_interface *intf;
|
||
<strong class="hl-keyword">struct</strong> usb_driver *usb_drv;
|
||
<strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> usb_device_id *id;
|
||
|
||
<em class="hl-comment">/* device drivers never match interfaces */</em>
|
||
<em class="hl-comment">/* (2.1) 只查找 `Usb Interface` 的 Driver */</em>
|
||
<strong class="hl-keyword">if</strong> (is_usb_device_driver(drv))
|
||
<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
|
||
|
||
intf = to_usb_interface(dev);
|
||
usb_drv = to_usb_driver(drv);
|
||
|
||
id = usb_match_id(intf, usb_drv->id_table);
|
||
<strong class="hl-keyword">if</strong> (id)
|
||
<strong class="hl-keyword">return</strong> <span class="hl-number">1</span>;
|
||
|
||
id = usb_match_dynamic_id(intf, usb_drv);
|
||
<strong class="hl-keyword">if</strong> (id)
|
||
<strong class="hl-keyword">return</strong> <span class="hl-number">1</span>;
|
||
}
|
||
|
||
<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
|
||
}</pre>
|
||
</section></div></article></main></div>
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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_device_layer__section_jvl_xnz_21c" data-tocid="usb_host_device_layer__section_jvl_xnz_21c">Device (struct usb_device)</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_host_device_layer__section_ovl_xnz_21c" data-tocid="usb_host_device_layer__section_ovl_xnz_21c">Driver (struct usb_device_driver)</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_host_device_layer__section_svl_xnz_21c" data-tocid="usb_host_device_layer__section_svl_xnz_21c">Bus (usb_bus_type)</a></div></li></ul></div>
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