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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-gadget_driver_legacy.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Gadget Driver Legacy</h1><div class="date inPage">31 Jan 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d307101e22__20250121171813">对于 Legacy Gadget Driver 驱动来说，相当于 Configfs Gadget Driver 的一个简化版。</p><section class="- topic/section section" id="usb_gadget_driver_legacy__section_a3y_jrz_21c" data-ofbid="usb_gadget_driver_legacy__section_a3y_jrz_21c"><h2 class="- topic/title title sectiontitle">Gadget Driver</h2>
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<p class="- topic/p p" data-ofbid="d307101e29__20250121171813">Legacy 风格的 gadget driver 的定义：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_gadget_driver_legacy__pre_b3y_jrz_21c" data-ofbid="usb_gadget_driver_legacy__pre_b3y_jrz_21c">drivers\usb\gadget\composite.c:staticconststructusb_gadget_drivercomposite_driver_template={.bind=composite_bind,.unbind=composite_unbind,.setup=composite_setup,.reset=composite_disconnect,.disconnect=composite_disconnect,.suspend=composite_suspend,.resume=composite_resume,.driver={.owner=THIS_MODULE,},};</pre>
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<p class="- topic/p p" data-ofbid="d307101e35__20250121171813">驱动提供了一个注册函数 usb_composite_probe()，以供 <code class="+ topic/ph pr-d/codeph ph codeph">composite device</code> 来进行调用：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_gadget_driver_legacy__pre_c3y_jrz_21c" data-ofbid="usb_gadget_driver_legacy__pre_c3y_jrz_21c"><strong class="hl-keyword">int</strong> usb_composite_probe(<strong class="hl-keyword">struct</strong> usb_composite_driver *driver)
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{
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<strong class="hl-keyword">struct</strong> usb_gadget_driver *gadget_driver;
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<strong class="hl-keyword">if</strong> (!driver || !driver->dev || !driver->bind)
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<strong class="hl-keyword">return</strong> -EINVAL;
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<strong class="hl-keyword">if</strong> (!driver->name)
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driver->name = <span class="hl-string">"composite"</span>;
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<em class="hl-comment">/* (1) 把传递过来的 `usb_composite_driver` 包装成 `usb_gadget_driver` */</em>
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driver->gadget_driver = composite_driver_template;
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gadget_driver = &driver->gadget_driver;
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gadget_driver->function = (<strong class="hl-keyword">char</strong> *) driver->name;
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gadget_driver->driver.name = driver->name;
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gadget_driver->max_speed = driver->max_speed;
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<em class="hl-comment">/* (2) 注册 gadget driver，让其和 gadget device 适配 */</em>
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<strong class="hl-keyword">return</strong> usb_gadget_probe_driver(gadget_driver);
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}
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EXPORT_SYMBOL_GPL(usb_composite_probe);
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</pre>
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</section><section class="- topic/section section" id="usb_gadget_driver_legacy__section_d3y_jrz_21c" data-ofbid="usb_gadget_driver_legacy__section_d3y_jrz_21c"><h2 class="- topic/title title sectiontitle">Composite Device</h2>
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<div class="- topic/p p" data-ofbid="d307101e49__20250121171813">没有了 configfs 由用户来创建 <code class="+ topic/ph pr-d/codeph ph codeph">composite device</code> ，只能使用一个文件来创建 <code class="+ topic/ph pr-d/codeph ph codeph">composite
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device</code> 定义其使用哪些 <code class="+ topic/ph pr-d/codeph ph codeph">function</code>
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和一系列配置。例如：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_gadget_driver_legacy__codeblock_zb5_krz_21c" data-ofbid="usb_gadget_driver_legacy__codeblock_zb5_krz_21c">drivers\usb\gadget\legacy\acm_ms.c
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">struct</strong> usb_composite_driver acm_ms_driver = {
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.name = <span class="hl-string">"g_acm_ms"</span>,
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.dev = &device_desc,
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.max_speed = USB_SPEED_SUPER,
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.strings = dev_strings,
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.bind = acm_ms_bind,
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.unbind = acm_ms_unbind,
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};
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<em class="hl-comment">/* (1) 驱动一开始就调用 usb_composite_probe() 来注册 acm_ms_driver
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因为 acm_ms_driver 没有指定 udc_name 所以只能适配第一个 udc
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*/</em>
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module_usb_composite_driver(acm_ms_driver);
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#<span class="hl-directive">define</span> module_usb_composite_driver(__usb_composite_driver) \
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module_driver(__usb_composite_driver, usb_composite_probe, \
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usb_composite_unregister)</pre></div>
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<div class="- topic/p p" data-ofbid="d307101e63__20250121171813">在 gadget driver 驱动适配后，调用 bind()
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函数：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_gadget_driver_legacy__codeblock_hfd_lrz_21c" data-ofbid="usb_gadget_driver_legacy__codeblock_hfd_lrz_21c">usb_gadget_probe_driver() → udc_bind_to_driver() → composite_bind() → acm_ms_bind()</pre></div>
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<p class="- topic/p p" data-ofbid="d307101e68__20250121171813">在 acm_ms_bind() 函数中创建 <code class="+ topic/ph pr-d/codeph ph codeph">composite device</code> 的
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<code class="+ topic/ph pr-d/codeph ph codeph">Configuration</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">Function/Interface</code> ，并且和 Gadget
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Device / UDC 进行绑定。</p>
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<p class="- topic/p p" data-ofbid="d307101e80__20250121171813">其他操作和 Configfs Gadget Driver 类似。</p>
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</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_gadget_driver_legacy__section_a3y_jrz_21c" data-tocid="usb_gadget_driver_legacy__section_a3y_jrz_21c">Gadget Driver</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_gadget_driver_legacy__section_d3y_jrz_21c" data-tocid="usb_gadget_driver_legacy__section_d3y_jrz_21c">Composite Device</a></div></li></ul></div>
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