On RedHat at least we have /usr/include/linux/major.h which documents which major number goes with which driver. And remember that there are character drivers and block drivers and one of each can use the same major number. By convention, when this happens the two drivers should be closely related. For example:
is an excerpt from that header file and we have
The major number just tells the kernel which driver to invoke. The driver is the part of the kernel that understands its own minor numbers. But there are conventions here too.
Not all driver writers completely follow conventions.
I am looking for a guide on how to program for either the Linux or FreeBSD (includes 4.4BSD, NetBSD or OpenBSD) kernel. I would prefer to learn how to write device drivers, but anything would help.
If you know, please email me at *removed* or leave a post here
Regards,
Farhan (0 Replies)
I've been researching minimizeing Solaris 8 and found that on the web page http://www.sun.com/bigadmin/content/packagelist/s8u7PkgList/p2.html the package SUNWglmr
is listed as "rasctrl environment monitoring driver for i2c, (Root) (32-bit)" while in the document "Solaris 8 minimize-updt1.pdf"... (1 Reply)
I recently started working with Linux and wrote my first device driver for a hardware chip controlled by a host CPU running Linux 2.6.x kernel.
1. The user space process makes an IOCTL call with pointer to a user memory buffer.
2. The kernel device driver in the big switch-case of IOCTL,... (1 Reply)
Hi all!
I am trying to register a device in an existing device class, but I am
having trouble getting the pointer to an existing class.
I can create a class in a module, get the pointer to it and then use
it to register the device with:
*cl = class_create(THIS_MODULE, className);... (0 Replies)