一、示意图

App

input.c

/ / / 分离 button.c < ===== > evdev.c
硬件相关 纯软件(稳定)

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bus_drv_dev模型 bus drv链表
1.把device放入bus的dev链表 device_add /.match 1.放入drv链表 2.从dv链表取出一一比较（match）
2.从bus的drv链表取出每一个drv / driver_register
用bus的match函数判断drv能否支持dev / 3.若支持，调用probe
3.若可以支持，调用drv的probe device driver
硬件相关 .probe比较稳定的代码
.name

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usb_bus_type / usb_new_device / usb_register
/
usb_interface usb_driver
.id_table
.probe

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platform_bus_type / .match　　 / /　　　　　　　　　　　　 platform_device platform_driver
.probe

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二、led_dev.c

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