From mboxrd@z Thu Jan  1 00:00:00 1970
From: greg@kroah.com (Greg KH)
Date: Tue, 23 May 2017 11:23:17 +0200
Subject: understanding of sysfs.
In-Reply-To: <CAA2oCOnLdwd1P2KSr+4cp3VTwvMLnSdUya__oogst23LzhA6NQ@mail.gmail.com>
References: <CAA2oCO=5qfpCCdnho7RiNEh2GZc26YXwkV604yOaLjoNvrczTA@mail.gmail.com>
	<20170523063455.GA18346@kroah.com>
	<CAA2oCOnLdwd1P2KSr+4cp3VTwvMLnSdUya__oogst23LzhA6NQ@mail.gmail.com>
Message-ID: <20170523092317.GC22923@kroah.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On Tue, May 23, 2017 at 12:58:07PM +0530, Madhu K wrote:
> Hi Greg,
> 
> Thanks for your response.
> 
> 
> On Tue, May 23, 2017 at 12:04 PM, Greg KH <greg@kroah.com> wrote:
> 
>     On Tue, May 23, 2017 at 11:58:31AM +0530, Madhu K wrote:
>     > Hi All,
>     >
>     > why there is no character device entry present in /sys/class? where as
>     block
>     > and net device entries are present.
> 
>     I see character devices there, but not the device nodes.? I don't see
>     block device nodes there either.
> 
> 
> If I am wrong please correct me, there is a folder called block in /sys/class.
> is block not containing block device nodes??

Nope, look closer :)

>     > Not only in /sys/class, for that matter why there is no character device
>     > entries present in /sys file system.
> 
>     What do you exactly mean by "character device entries"?
> 
> 
> like block and net why there is no char folder??

Again, look closer please.

>     > please help me to understand for what purpose char devices are kept away
>     from /
>     > sys file system.
> 
>     Have you read the driver model chapter in the Linux Device drivers book,
>     or the in-kernel sysfs documentation?

Again, please read all of the copious documentation that we have written
already about this topic.  If after that, you still have questions, I
will be more than glad to help answer them.

thanks,

greg k-h