On Wed, Feb 03, 2010 at 02:31:55PM +0100, Martin Poupe wrote:
> On 3.02.2010 14:05, Andreas Mohr wrote:
>> On Wed, Feb 03, 2010 at 11:27:33AM +0100, Martin Poupe wrote:
>>
>>> Now I need to access the USB via sysfs, because not all Linux platforms
>>> have usbfs available. I cannot open("/sys/bus/usb/devices/5-1", O_RDWR)
>>> because this is a directory :-( What file in this directory (or
>>> elsewhere) should be opened for ioctl() ?
>>>
>> Any specific reason not to use libusb instead of doing raw access?
>> (ok, if we're talking about nuts-and-bolts embedded OTOH...)
>>
>> Andreas Mohr
>>
>>
> Yes, some (embedded) platforms do not have libusb available. And moreover
> libusb (version 1.0) still uses usbfs for opening the device.
> It uses sysfs only to enumerate devices.
Yes, and this is what you need to do as well. usbfs is still around,
it's just not "mounted", you want the /dev/bus/usb/ files, which is
still the usbfs interface.
Look at how libusb does this for an example of what you can also do.
Hope this helps,
greg k-h
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