On Fri, Mar 30, 2007 at 08:06:23AM +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 > > So the above is actually possible? Yes, once you have a major number, you can separate out the minor numbers how ever you wish to. > >> 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 :) > > Is that taken care by cdev_add() itself? Nope, not at all. thanks, greg k-h - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs
