[ale] USB port identification

[Chris Fowler]

> From: "Alex Carver" <agcarver+ale at acarver.net>
> To: ale at ale.org
> Sent: Thursday, November 19, 2015 11:51:03 AM
> Subject: Re: [ale] USB port identification

> Ok, then use lsusb or the system log to find the serial number for each
> device and add that as an additional uniqueness parameter in a udev
> rule. Barring that, look at the kernel device tree which will show the
> physical layout as something like:

> /devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4.5

> Which would be port five on a hub attached to bus 1, port 4.

Beyond the USB->Serial adapters, I have 200 USB modems in my garage all with the serial 1234567. :) 

I need to investigate the tree. Does port 4 = the device # 

I think one thing causing me issue is the Hub. This "hub" does not exist outside this device. 

[root at localhost]# lsusb -t 
Bus# 4 
`-Dev# 1 Vendor 0x1d6b Product 0x0002 
Bus# 3 
`-Dev# 1 Vendor 0x1d6b Product 0x0003 
|-Dev# 2 Vendor 0x15d9 Product 0x0a37 
`-Dev# 3 Vendor 0x0572 Product 0x1340 
Bus# 2 
`-Dev# 1 Vendor 0x1d6b Product 0x0003 
Bus# 1 
`-Dev# 1 Vendor 0x1d6b Product 0x0002 
`-Dev# 2 Vendor 0x8087 Product 0x07e6 
`-Dev# 3 Vendor 0x1a40 Product 0x0101 
`-Dev# 5 Vendor 0x148f Product 0x5370 

This device: 
Bus 001 Device 005: ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter 

Is here: 
/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4.2 

1-1: Intel device 
1-1.4: Terminus Hub 
1-1.4.2: The Ralink 

Intel is the controller. Manufacturer is using a hub to provide 4 USB ports to one controller. usb1 is the Linux controller. 
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