Gadget Driver

最新推荐文章于 2024-04-11 13:11:10 发布

转载最新推荐文章于 2024-04-11 13:11:10 发布 · 899 阅读

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#include #events #string #linux

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本文深入探讨了Gadget驱动的功能及其实现方式。介绍了该驱动如何处理USB设备的配置与交互，包括设置请求、配置描述符返回等职责。此外，还讨论了如何针对不同控制器进行配置以支持多种硬件。

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Gadget Driver

The lower boundary of this driver implements hardware-neutralUSB functions, using calls to the controller driver.Because such hardware varies widely in capabilities and restrictions,and is used in embedded environments where space is at a premium,the gadget driver is often configured at compile timeto work with endpoints supported by one particular controller.Gadget drivers may be portable to several different controllers,using conditional compilation.(Recent kernels substantially simplify the work involved insupporting new hardware, by autoconfiguringendpoints automatically for many bulk-oriented drivers.)Gadget driver responsibilities include:

handling setup requests (ep0 protocol responses)possibly including class-specific functionality
returning configuration and string descriptors
(re)setting configurations and interfacealtsettings, including enabling and configuring endpoints
handling life cycle events, such as managingbindings to hardware,USB suspend/resume, remote wakeup,and disconnection from the USB host.
managing IN and OUT transfers on all currentlyenabled endpoints

Such drivers may be modules of proprietary code, althoughthat approach is discouraged in the Linux community.