debugfs_create_u32 — create a file in the debugfs filesystem that is used to read and write a unsigned 8 bit value.
struct dentry * debugfs_create_u32 ( | const char * | name, |
| mode_t | mode, | |
| struct dentry * | parent, | |
| u32 * | value); |
namea pointer to a string containing the name of the file to create.
modethe permission that the file should have
parenta pointer to the parent dentry for this file. This should be a directory dentry if set. If this paramater is NULL, then the file will be created in the root of the debugfs filesystem.
valuea pointer to the variable that the file should read to and write from.
This function creates a file in debugfs with the given name that
contains the value of the variable value. If the mode variable is so
set, it can be read from, and written to.
This function will return a pointer to a dentry if it succeeds. This
pointer must be passed to the debugfs_remove function when the file is
to be removed (no automatic cleanup happens if your module is unloaded,
you are responsible here.) If an error occurs, NULL will be returned.
If debugfs is not enabled in the kernel, the value -ENODEV will be returned. It is not wise to check for this value, but rather, check for NULL or !NULL instead as to eliminate the need for #ifdef in the calling code.
This function creates a file in debugfs with the given name that
contains the value of the variable value. If the mode variable is so
set, it can be read from, and written to.
This function will return a pointer to a dentry if it succeeds. This
pointer must be passed to the debugfs_remove function when the file is
to be removed (no automatic cleanup happens if your module is unloaded,
you are responsible here.) If an error occurs, NULL will be returned.
If debugfs is not enabled in the kernel, the value -ENODEV will be returned. It is not wise to check for this value, but rather, check for NULL or !NULL instead as to eliminate the need for #ifdef in the calling code.