/* * (C) Copyright IBM Corp. 2004 * tape_class.c ($Revision: 1.8 $) * * Tape class device support * * Author: Stefan Bader <shbader@de.ibm.com> * Based on simple class device code by Greg K-H */#include "tape_class.h"MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");MODULE_DESCRIPTION(	"(C) Copyright IBM Corp. 2004   All Rights Reserved.\n"	"tape_class.c ($Revision: 1.8 $)");MODULE_LICENSE("GPL");static struct class *tape_class;/* * Register a tape device and return a pointer to the cdev structure. * * device *	The pointer to the struct device of the physical (base) device. * drivername *	The pointer to the drivers name for it's character devices. * dev *	The intended major/minor number. The major number may be 0 to *	get a dynamic major number. * fops *	The pointer to the drivers file operations for the tape device. * devname *	The pointer to the name of the character device. */struct tape_class_device *register_tape_dev(	struct device *		device,	dev_t			dev,	struct file_operations *fops,	char *			device_name,	char *			mode_name){	struct tape_class_device *	tcd;	int		rc;	char *		s;	tcd = kmalloc(sizeof(struct tape_class_device), GFP_KERNEL);	if (!tcd)		return ERR_PTR(-ENOMEM);	memset(tcd, 0, sizeof(struct tape_class_device));	strncpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN);	for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/'))		*s = '!';	strncpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN);	for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/'))		*s = '!';	tcd->char_device = cdev_alloc();	if (!tcd->char_device) {		rc = -ENOMEM;		goto fail_with_tcd;	}	tcd->char_device->owner = fops->owner;	tcd->char_device->ops   = fops;	tcd->char_device->dev   = dev;	rc = cdev_add(tcd->char_device, tcd->char_device->dev, 1);	if (rc)		goto fail_with_cdev;	tcd->class_device = class_device_create(				tape_class,				NULL,				tcd->char_device->dev,				device,				"%s", tcd->device_name			);	sysfs_create_link(		&device->kobj,		&tcd->class_device->kobj,		tcd->mode_name	);	return tcd;fail_with_cdev:	cdev_del(tcd->char_device);fail_with_tcd:	kfree(tcd);	return ERR_PTR(rc);}EXPORT_SYMBOL(register_tape_dev);void unregister_tape_dev(struct tape_class_device *tcd){	if (tcd != NULL && !IS_ERR(tcd)) {		sysfs_remove_link(			&tcd->class_device->dev->kobj,			tcd->mode_name		);		class_device_destroy(tape_class, tcd->char_device->dev);		cdev_del(tcd->char_device);		kfree(tcd);	}}EXPORT_SYMBOL(unregister_tape_dev);static int __init tape_init(void){	tape_class = class_create(THIS_MODULE, "tape390");	return 0;}static void __exit tape_exit(void){	class_destroy(tape_class);	tape_class = NULL;}postcore_initcall(tape_init);module_exit(tape_exit);