linux-kernel - Re: class_device_create() and the mode of the device file in /dev.

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Message-ID: <3ae72650705222046o352ca76epbd5c36dea7706e70@mail.gmail.com>
Date:	Wed, 23 May 2007 05:46:50 +0200
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Y Khan" <ykhanportland@...oo.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: class_device_create() and the mode of the device file in /dev.

On 5/23/07, Y Khan <ykhanportland@...oo.com> wrote:
> I am porting a driver from 2.4 to 2.6. I have replaced
> the call devfs_register() with class_create() and
> class_device_create(). Now, udev is automatically
> creating the device file in /dev.

Please use device_create(), class_device_* will go away in the future.

> The device file being created has a default mode of
> 0600. Is it possible to override this default mode
> from inside the kernel. I do not want to do anything
> in the configuration file for udev.
>
> I could modify the attribute of the class and the
> class device but I do not think that they will change
> the default permissions for the /dev device file.
>
> devfs_register() used to take a mode argument.

No, the kernel is not involved in specifying /dev permissions. You
have to add a udev rule to assign a mode that isn't the default.

Thanks,
Kay
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