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List:       linux-usb
Subject:    Multiple ttyUSBX , no udev which is which
From:       John Ervin <JohnLErvin () gmail ! com>
Date:       2010-05-21 23:17:16
Message-ID: loom.20100522T010702-537 () post ! gmane ! org
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Hello,

I have multiple devices on an embedded 2.6 linux system that does not have udev.
 
These devices are using different usbserial-dependent drivers and link to one of 

the ttyUSBX devices which have been setup. I see in the kernel logs that the 

linkings are fine first to \dev\ttyUSB0, then to \dev\ttyUSB1. However how do I 

tell this from userspace?


It seems that /sys has that information. However, looping through this directory 

and matching Vendor and product IDs seems too cumbersome a solution. Is there a 

more straightforward way? For instance can I open the \dev\ttyUSBX files and send
 
an IOCTL to query the IDs?

thanks,
John



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