Re: usb coldplug problem

[Bernd Porr <B.Porr@elec.gla.ac.uk>]

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Hi!

It's not that easy. The actual udev event triggers comedi_config which 
does _also_ the firmware upload on the side. Even if I upload the 
firmware via sysfs I still need to run comedi_config to set up the 
comedi device. Therefore it's simpler to do it via comedi_config as this 
supports firmware upload anyway and people can also do it manually if 
udev is not supported, for example on embedded systems. You see I've put 
in some thought into that earlier. But I'm open for suggestions. ;-)

/Bernd

www:    http://www.berndporr.me.uk/
         http://www.linux-usb-daq.co.uk/
Mobile: +44 (0)7840 340069
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Greg KH wrote:
> On Mon, Dec 01, 2008 at 08:46:52AM +0000, Bernd Porr wrote:
>> Hi!
>>
>> I'm the maintainter of the USBDUX board which connects via the USB to 
>> linux.
>>
>> In order to work properly the USBDUX needs firmware uploaded. So, I wrote a 
>> udev rule which uploads the firmware as soon as there's a udev event from 
>> the USB BUS (this is done via comedi_config).
> 
> Why not just use the firmware functions in the kernel core for this?
> That way, when the device is seen by udev, the correct firmware request
> function will be called, your firmware will be loaded, and everything
> should be just fine.
> 
> No need to reinvent the wheel here :)
> 
> thanks,
> 
> greg k-h

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