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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-device-controller-driver.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">USB Device Controller Driver</h1><div class="date inPage">6 Dec 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="table-container"><table class="- topic/table table frame-all" id="usb_device_controller_driver__table_y45_kmz_21c" data-ofbid="usb_device_controller_driver__table_y45_kmz_21c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">源码说明</span></caption><colgroup><col style="width:23.474178403755868%"/><col style="width:76.52582159624413%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="usb_device_controller_driver__table_y45_kmz_21c__entry__1">相关模块</th><th class="- topic/entry entry colsep-0 rowsep-1" id="usb_device_controller_driver__table_y45_kmz_21c__entry__2">源码路径</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="usb_device_controller_driver__table_y45_kmz_21c__entry__1">AIC UDC</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="usb_device_controller_driver__table_y45_kmz_21c__entry__2">
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<p class="- topic/p p" data-ofbid="d222514e40__20250121171647"><span class="+ topic/ph sw-d/filepath ph filepath">source\linux-5.10\drivers\usb\gadget\udc\aic_udc.c</span></p>
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<p class="- topic/p p" data-ofbid="d222514e44__20250121171647"><span class="+ topic/ph sw-d/filepath ph filepath">source\linux-5.10\drivers\usb\gadget\udc\aic_udc.h</span></p>
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</td></tr></tbody></table></div><div class="- topic/p p" data-ofbid="d222514e48__20250121171647"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_device_controller_driver__image_awc_mmz_21c" src="../../../images/usb/usb_dcd.png" width="576" alt="image4"/></div><br/></div><p class="- topic/p p" data-ofbid="d222514e52__20250121171647">从上述 Device Controller Driver (DCD) 的框架图中可以看到，DCD 主要提供了两大功能：</p><ol class="- topic/ol ol" id="usb_device_controller_driver__ol_bwc_mmz_21c" data-ofbid="usb_device_controller_driver__ol_bwc_mmz_21c"><li class="- topic/li li" data-ofbid="d222514e55__20250121171647">
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<p class="- topic/p p" data-ofbid="d222514e57__20250121171647">普通 ep 的 usb request 处理。</p>
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<p class="- topic/p p" data-ofbid="d222514e60__20250121171647">DCD 提供了一个 endpoint 资源池，Gadget Function Driver 可以在这个资源池中分配需要的 endpoint，这部分的
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endpoint 就称为 普通 ep。</p>
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</li><li class="- topic/li li" data-ofbid="d222514e63__20250121171647">
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<p class="- topic/p p" data-ofbid="d222514e65__20250121171647">ep0 的 usb request 处理。</p>
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<p class="- topic/p p" data-ofbid="d222514e68__20250121171647">因为 DCD 对外呈现为一个 USB Device，USB Device 的 ep0 是管理通道是需要特殊处理的。对 ep0 传达过来的 control
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数据需要在 DCD 层开始解析。</p>
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</li></ol></div></article></main></div>
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