LXR linux/drivers/s390/char/tape

   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
  26struct tape_class_device {
  27        struct cdev             *char_device;
  28        struct 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 */
  52struct tape_class_device *register_tape_dev(
  53        struct device *         device,
  54        dev_t                   dev,
  55        const struct file_operations *fops,
  56        char *                  device_name,
  57        char *                  node_name
  58);
  59void unregister_tape_dev(struct device *device, struct tape_class_device *tcd);
  60
  61#endif /* __TAPE_CLASS_H__ */
  62