1 /* 2 * (C) Copyright IBM Corp. 2004 All Rights Reserved. 3 * tape_class.h 4 * 5 * Tape class device support 6 * 7 * Author: Stefan Bader <shbader@de.ibm.com> 8 * Based on simple class device code by Greg K-H 9 */ 10 #ifndef __TAPE_CLASS_H__ 11 #define __TAPE_CLASS_H__ 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/fs.h> 16 #include <linux/major.h> 17 #include <linux/kobj_map.h> 18 #include <linux/cdev.h> 19 20 #include <linux/device.h> 21 #include <linux/kdev_t.h> 22 23 #define TAPECLASS_NAME_LEN 32 24 25 struct tape_class_device { 26 struct cdev *char_device; 27 struct device *class_device; 28 char device_name[TAPECLASS_NAME_LEN]; 29 char mode_name[TAPECLASS_NAME_LEN]; 30 }; 31 32 /* 33 * Register a tape device and return a pointer to the tape class device 34 * created by the call. 35 * 36 * device 37 * The pointer to the struct device of the physical (base) device. 38 * dev 39 * The intended major/minor number. The major number may be 0 to 40 * get a dynamic major number. 41 * fops 42 * The pointer to the drivers file operations for the tape device. 43 * device_name 44 * Pointer to the logical device name (will also be used as kobject name 45 * of the cdev). This can also be called the name of the tape class 46 * device. 47 * mode_name 48 * Points to the name of the tape mode. This creates a link with that 49 * name from the physical device to the logical device (class). 50 */ 51 struct tape_class_device *register_tape_dev( 52 struct device * device, 53 dev_t dev, 54 const struct file_operations *fops, 55 char * device_name, 56 char * node_name 57 ); 58 void unregister_tape_dev(struct device *device, struct tape_class_device *tcd); 59 60 #endif /* __TAPE_CLASS_H__ */ 61