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.

See also this question: http://stackoverflow.com/questions/5970595/ — Eugene, May 19 '12 at 05:53

score 2 · Answer 1 · answered Jun 22 '12 at 20:05

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.

score 0 · Answer 2 · answered Feb 17 '14 at 11:55

0

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

answered Feb 17 '14 at 11:55

vishwakarma09

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Creating a device file: Linux device driver

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