Re: [PATCH] USB: serial: xr: Add TIOCGRS485 and TIOCSRS485 ioctls

Oliver Neukum
2023-03-13T20:21:04Z

On 13.03.23 16:50, Greg Kroah-Hartman wrote:
> On Mon, Mar 13, 2023 at 05:07:59PM +0200, Jarkko Sonninen wrote:

>> Using ENOTTY breaks all other tty ioctls.
>
> What other tty ioctls?
>
> confused,
>

This is one of those handlers which simulate OO inheritance in C.
You can implement any IOCTL in the driver. If you do not, you
give back -ENOICTLCOMMAND. Any other error means that you did
implement it and an error occured in the method.

HTH
Oliver