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/kobject.h> 18 #include <linux/kobj_map.h> 19 #include <linux/cdev.h> 20 21 #include <linux/device.h> 22 #include <linux/kdev_t.h> 23 24 #define TAPECLASS_NAME_LEN 32 25 26 struct tape_class_device { 27 struct cdev * char_device; 28 struct class_device * class_device; 29 char device_name[TAPECLASS_NAME_LEN]; 30 char mode_name[TAPECLASS_NAME_LEN]; 31 }; 32 33 /* 34 * Register a tape device and return a pointer to the tape class device 35 * created by the call. 36 * 37 * device 38 * The pointer to the struct device of the physical (base) device. 39 * dev 40 * The intended major/minor number. The major number may be 0 to 41 * get a dynamic major number. 42 * fops 43 * The pointer to the drivers file operations for the tape device. 44 * device_name 45 * Pointer to the logical device name (will also be used as kobject name 46 * of the cdev). This can also be called the name of the tape class 47 * device. 48 * mode_name 49 * Points to the name of the tape mode. This creates a link with that 50 * name from the physical device to the logical device (class). 51 */ 52 struct tape_class_device *register_tape_dev( 53 struct device * device, 54 dev_t dev, 55 struct file_operations *fops, 56 char * device_name, 57 char * node_name 58 ); 59 void unregister_tape_dev(struct tape_class_device *tcd); 60 61 #endif /* __TAPE_CLASS_H__ */ 62