Analysis of Linux USB Gadget ADB Driver This article briefly explains how to configure the USB ADB device through Configfs ffs. The typical block diagram of a working Linux ADB setup is shown below, primarily illustrating how the USB ADB device side operates. Host Side (Host): +———————————————–+ | Host Computer | | +———————+ +—————-+ | … Read more
Design and Implementation of Linux Gadget Configfs This article briefly explains the implementation ideas of Gadget Configfs. 1. Configfs Implementation Design The following describes the working principle of configfs. In configfs, there are items and groups, both presented in the form of directories. The difference between items and groups is that a group can contain … Read more
adb functionuses bulk transfer mode, requiring twoEP(in/out), and thepacket size required inusb2.0 mode is 512 bytes.1. Kernel ConfigurationSelect “function filesystem“, and after compilation, it will generate usb_f_fs.ko and g_ffs.koIf configured via configfs, please use the configuration below How to Test As mentioned earlier, ADB implements the logic for USB Device configuration and data transfer at … Read more