适合嵌入式Linux 2.4内核的usb hotplug

最新推荐文章于 2024-07-17 00:31:07 发布

转载最新推荐文章于 2024-07-17 00:31:07 发布 · 1.1k 阅读

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#嵌入式 #linux #file

本文介绍了一种在Linux 2.6系统中检测USB存储设备的方法。通过检查/proc/scsi/usb-storage-#目录的存在与否及Attach状态来判断USB设备是否连接。如果Attach为Yes，则说明设备已连接并可根据编号转换成设备名如sda、sdb等。

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1. check if /proc/scsi/usb-storage-# exist or not
2. if exist. check if /proc/scsi/usb-storage-#/# exist or not
3. if exist. check the file /proc/scsi/usb-storage-#/# if it says Attach: Yes
4. if Yes. the # can be converted to device name:
0 = sda, 1=sdb, 2=sdc
5. But I don't know which USB port it connects to. and you don't need to know also.

for example: /proc/scsi/usb-storage-0/0 says Attach: No, then /dev/sda is not attached
/proc/scsi/usb-storage-1/1 says Attach: Yes, then it is attached, you can mount it.
If you plug in usb storage with brandname A first, the it is usb-storage-0, then you unplug it, but that directory still exists, and now you plug in Brandname B, the storage-1 directory will be created, and storage-0 is still there.

linux 2.6

http://blog.chinaunix.net/u2/72751/showart_1082492.html 待研究