Major device number?

[Altera_Forum]

How can I know which major device number are occupied by the kernel, and which can be used by the programmer? 

thanks.

[Altera_Forum]

--- Quote Start ---  originally posted by 0quanquan0@Oct 18 2006, 08:57 AM how can i know which major device number are occupied by the kernel, and which can be used by the programmer? thanks. <div align='right'><{post_snapback}> (index.php?act=findpost&pid=18761)  --- quote end ---    --- Quote End ---   linux-2.6.x/Documentation/devices.txt

[Altera_Forum]

Thanks you, hippo. I have found this file, but I am a little confused, I don&#39;t know how to find useful information in it, how can I find the major number I can used?  

 And I have another question about register device driver: I am studying two examples of led driver, they use different register methods, one just uses the register_chrdev() function, but another uses devfs_register_chrdev(), devfs_mk_dir(), devfs_register() to finish register.   Can you tell me the difference betweem them?  thank you very much.

[Altera_Forum]

--- Quote Start ---  originally posted by 0quanquan0@Oct 18 2006, 11:39 AM thanks you, hippo. i have found this file, but i am a little confused, i don&#39;t know how to find useful information in it, how can i find the major number i can used?   and i have another question about register device driver: i am studying two examples of led driver, they use different register methods, one just uses the register_chrdev() function, but another uses devfs_register_chrdev(), devfs_mk_dir(), devfs_register() to finish register.   can you tell me the difference betweem them?  thank you very much. <div align='right'><{post_snapback}> (index.php?act=findpost&pid=18764)  --- quote end ---    --- Quote End ---   Look in ch3 of the (must have) book "Linux Device Driver 3rd ed."