On Mon, Nov 4, 2013 at 2:21 PM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > Where specifically in the kernel? Busywaiting for data transferrs to > complete, or doing something else? Are you keeping the pipeline full to > the device? You should be able to hit USB "line speed" from userspace > if you just are reading/writing bulk data with enough transferrs in > flight. I'll confirm this with my colleagues. Sorry I wasn't really verbose enough here. > That's a good place to start, but it really depends on what type of > interface you want to expose to userspace, as to what the best driver to > base off of would be. I was thinking about a simple char / misc device with a read / write / ioctl or sysfs interface. The userland part would again be provided by UHD as with our ethernet devices. > As you are a ADC/DAC, you probably want to tie into the comedi > subsystem, so take a look at the USB drivers in the > drivers/staging/comedi/ subdirectories for an example of what to use. Thanks a lot already for your quick response. I'll read up on comedi and see if it fits our use case, and hopefully come back with some code to look at ;-) Cheers, Moritz -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
