From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Subject: Re: Query regarding alloc_chrdev_region() Date: Thu, 29 Mar 2007 19:10:34 -0700 Message-ID: <20070330021034.GA21152@kroah.com> References: Reply-To: kernelnewbies Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-newbie-owner@vger.kernel.org List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Rajat Jain Cc: kernelnewbies , newbie On Thu, Mar 29, 2007 at 10:50:34PM +0530, Rajat Jain wrote: > Hi, > > I was wondering that while using dynamic device numner allocation, can > we ever have a scenario like following (using alloc_chrdev_region): > > 1) Char Driver A is hooked on Major num X, minor numbers 0-10 > 2) Char Driver B is hooked on (same) Major num X, minor numbers 11-20 > > If yes, how will the userland get to know about the dynamically > allocated range (needed to create device nodes), since /proc/devices > only shows major numbers? Through the exporting of this information in sysfs by using the device_create() call that you are required to do in order to have your device show up properly there :) thanks, greg k-h - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs