On 2015-06-21 01:49, Peter Stuge wrote: > Stefan Agner wrote: >> libftdi requires to detach the kernel driver to get access to the device > > Control transfers ought to be possible without a detach. Good to know, thanks for this input. The detach is probably a default behavior of libftdi... Will have a look at that. Having kernel level gpiolib would still have advantages: It would make the matching of the GPIO's and tty device easier, since with this patch the gpiolib device is a sub-node of the usb-serial device in sysfs and the user would have to use kernel interfaces only (no libftdi)... -- Stefan -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in