On Fri, 29 Aug 2014, vichy wrote:
> hi all:
> I have read the article below and try to do the same operation on my device.
> http://lwn.net/Articles/143397/
>
> My environment:
> 1. my kernel is 3.16
> 2. device descriptor is attached.
> 3. below are my operation logs:
> # echo -n "4-2:1.0" > /sys/bus/usb/drivers/uas/unbind
> # echo -n "4-2:1.0" > /sys/bus/usb/drivers/usb-storage/unbind
> bash: echo: write error: No such device
> #
Why do you want to bind your drive to usb-storage instead of uas?
> My questions:
> 1. is there anything I need to do, such as PCI driver, before bind to
> usb-storage driver?
Normally, if uas will bind to a device then usb-storage won't. You can
change this by using a module paramter for usb-storage:
modprobe usb-storage quirks=1759:5002:u
(1759 and 5002 are the vendor and product IDs for this device.)
> 2. I can check whether the usb device is bound to specific driver
> through "cat /sys/kernel/debug/usb/devices".
> is there any alternative way to do so? how about other drivers,
> except usb, to let user know whether the binding/unbinding
> successfully and which device is bound to which driver?
ls -l /sys/bus/usb/devices/.../driver
where you fill in the "..." with the path for the interface you are
interested in, such as 1-4:1.0. Alternatively,
ls /sys/bus/usb/drivers/.../
where you fill in the "..." with the name of the driver you are
interested in.
Alan Stern
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