Re: [PATCH RFC] ALSA: scarlett2: Add ioctls for user-space access

On 14. 10. 23 15:58, Geoffrey D. Bennett wrote:

In order to support functions such as firmware upgrade from user-space, add ioctls for submitting arbitrary proprietary requests through scarlett2_usb() and requesting/releasing exclusive access.

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Hi Takashi,

I recently figured how to update the firmware on Scarlett Gen 2+ devices. I think the best way to implement this is with an ioctl giving access to the scarlett2_usb() function from user-space, plus two ioctls to request/release exclusive access.

Does something like this seem reasonable?

Maybe you can use libusb for this job without an additional kernel interface. It allows to detach the USB kernel driver and attach it again when the job is complete.

Jaroslav