Creating a device file: Linux device driver

Question

How to create a device file when I do not know the minor and major number (i.e. by using dynamic registration) without using mknod or MAKEDEV.

You should learn a lot more about udev

Basile Starynkevitch
– Basile Starynkevitch

2012-05-18 12:48:46 +00:00
Commented May 18, 2012 at 12:48 — Basile Starynkevitch
– Basile Starynkevitch, Commented May 18, 2012 at 12:48
See also this question: stackoverflow.com/questions/5970595

Eugene
– Eugene

2012-05-19 05:53:29 +00:00
Commented May 19, 2012 at 5:53 — Eugene
– Eugene, Commented May 19, 2012 at 5:53

NKamrath · Accepted Answer · 2012-06-22 20:05:23Z

Say you want to dynamically assign a major number to a char device on insertion, use:

int alloc_chrdev_region(dev_t *dev, unsigned int firstminor, unsigned int count, char *name);

From Linux Device Drivers 3rd Edition. Google it you can get the entire book for free along with tons of great source code for messing with drivers.

vishwakarma09 · Accepted Answer · 2014-02-17 11:55:28Z

Also, the codes provided in the LDD3 are obsolete now. So, use this github repo to download example codes of LDD3: https://github.com/martinezjavier/ldd3

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