On Tue, Feb 8, 2011 at 5:50 PM, Sankar P <sankar.curiosity@xxxxxxxxx> wrote: > On Tue, Feb 8, 2011 at 5:36 PM, Daniel Baluta <daniel.baluta@xxxxxxxxx> > wrote: >> >> > If I try to create a file using, 'mknod /dev/scull2 c 250 7' , the >> > character device file gets created with a minor number of 7. >> >> You can create as much /dev/scull2 files using mknod as you >> want, but they are not linked with your driver. >> >> [first_minor, count] pair passed to alloc_chrdev_region reserve >> for you a range of minors that will be later used by your driver. >> >> Next step is to actually create the link between the node and your >> driver using chrdev_add. >> > > Ah okay. I understand this now. On reading a few more pages in the book, I > see that the authors explain this phenomenon. > However, It seems using register_chrdev is an old way of doing things and > new code should use cdev. I just did a grep for cdev on the latest sources > and not much seem to be using the cdev* apis. The new way now is to find a class for a device and to use that class helpers. Have a look at miscdev for a simple starter [1]. thanks, Daniel. [1] http://lxr.linux.no/linux+v2.6.37/include/linux/miscdevice.h _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
