C/C++ Libusb, detaching a kernel driver resets the keyboards X settings

coralfang · 02-23-2022, 08:20 AM

Hi, working on a driver/library for a USB keyboard in C/C++
When i'm issuing this with libusb;

Code:

libusb_set_auto_detach_kernel_driver(device_handle, 1);
libusb_claim_interface(device_handle, 0);

...
...

libusb_release_interface(device_handle, 0);
libusb_close(device_handle);
libusb_exit(NULL);

As the kernel driver is reattached, all the xorg related settings for the keyboard are reset?
For example in my window manager startup commands i have these:

Code:

setxkbmap gb
xset r rate 400 25

But those settings are reset each time i'm running those function in a libusb program, and i end up on a US keyboard layout. Is there some way to stop this happening?

Possibly, i may need to include an xorg header to grab the current settings, and reapply them at the end of the program? But i'm not sure how to go about that if that is a potential solution...

Any help would be much appreciated, thanks.

lucky_day · 03-01-2022, 05:05 PM

Quote:

Originally Posted by coralfang

Hi, working on a driver/library for a USB keyboard in C/C++
When i'm issuing this with libusb;

Code:

libusb_set_auto_detach_kernel_driver(device_handle, 1);
libusb_claim_interface(device_handle, 0);

...
...

libusb_release_interface(device_handle, 0);
libusb_close(device_handle);
libusb_exit(NULL);

As the kernel driver is reattached, all the xorg related settings for the keyboard are reset?
For example in my window manager startup commands i have these:

Code:

setxkbmap gb
xset r rate 400 25

But those settings are reset each time i'm running those function in a libusb program, and i end up on a US keyboard layout. Is there some way to stop this happening?

Possibly, i may need to include an xorg header to grab the current settings, and reapply them at the end of the program? But i'm not sure how to go about that if that is a potential solution...

Any help would be much appreciated, thanks.

what you need is probably under <X11/XKBlib.h> I can't really tell which function you should use, https://www.x.org/releases/X11R7.6/d...KB/xkblib.html