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Ylowy 2021-09-19 20:39:56 +08:00 committed by GitHub
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@ -869,7 +869,7 @@ You do this by using the \cpp|register_chrdev| function, defined by \src{include
int register_chrdev(unsigned int major, const char *name, struct file_operations *fops);
\end{code}
where unsigned int major is the major number you want to request, \cpp|const char *name| is the name of the device as it will appear in \verb|/proc/devices| and \cpp|struct file_operations *fops| is a pointer to the \cpp|file_operations| table for your driver.
Where unsigned int major is the major number you want to request, \cpp|const char *name| is the name of the device as it will appear in \verb|/proc/devices| and \cpp|struct file_operations *fops| is a pointer to the \cpp|file_operations| table for your driver.
A negative return value means the registration failed. Note that we didn't pass the minor number to \cpp|register_chrdev|.
That is because the kernel doesn't care about the minor number; only our driver uses it.