Linux Device Drivers Development

Device driver attributes

The structure used here is struct driver_attribute:

struct driver_attribute { 
        struct attribute attr; 
        ssize_t (*show)(struct device_driver *, char * buf); 
        ssize_t (*store)(struct device_driver *, const char * buf, 
                         size_t count); 
}; 

The declaration relies on the DRIVER_ATTR macro, which will prefix the attribute variable name with DRIVER_ATTR:

DRIVER_ATTR(_name, _mode, _show, _store) 

The macro definition is as follows:

#define DRIVER_ATTR(_name, _mode, _show, _store) \ 
struct driver_attribute driver_attr_##_name = __ATTR(_name, _mode, _show, _store) 

Creation/removal relies on the driver_{create|remove}_file functions:

int driver_create_file(struct device_driver *, const struct driver_attribute *); void driver_remove_file(struct ...