Register a range of char device numbers
int alloc_chrdev_region(dev_t * dev, unsigned baseminor, unsigned count, const char * name);
dev
output parameter for first assigned number
baseminor
first of the requested range of minor numbers
count
the number of minor numbers required
name
the name of the associated device or driver
Allocates a range of char device numbers. The major number will be chosen dynamically, and returned (along with the first minor number) in dev. Returns zero or a negative error code.