linux-kernel - Re: fs: layered device driver to write to evdev

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Message-ID: <Y2Ls6tPhgOcfyxZ2@sol.localdomain>
Date:   Wed, 2 Nov 2022 15:19:22 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Guillermo Rodriguez Garcia <guille.rodriguez@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>
Subject: Re: fs: layered device driver to write to evdev

On Wed, Nov 02, 2022 at 02:14:24PM +0100, Guillermo Rodriguez Garcia wrote:
> What is the recommended way to have a layered device driver that can
> talk to evdev ?

Don't do that.  evdev is a userspace interface, not something for internal
kernel use.  Just write userspace code that uses evdev to do what you want.
Or if it's really necessary, add features to the real device driver.

- Eric