LXR linux/drivers/s390/char/tape

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright IBM Corp. 2004   All Rights Reserved.
   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/cdev.h>
  18
  19#include <linux/device.h>
  20#include <linux/kdev_t.h>
  21
  22#define TAPECLASS_NAME_LEN      32
  23
  24struct tape_class_device {
  25        struct cdev             *char_device;
  26        struct device           *class_device;
  27        char                    device_name[TAPECLASS_NAME_LEN];
  28        char                    mode_name[TAPECLASS_NAME_LEN];
  29};
  30
  31/*
  32 * Register a tape device and return a pointer to the tape class device
  33 * created by the call.
  34 *
  35 * device
  36 *      The pointer to the struct device of the physical (base) device.
  37 * dev
  38 *      The intended major/minor number. The major number may be 0 to
  39 *      get a dynamic major number.
  40 * fops
  41 *      The pointer to the drivers file operations for the tape device.
  42 * device_name
  43 *      Pointer to the logical device name (will also be used as kobject name
  44 *      of the cdev). This can also be called the name of the tape class
  45 *      device.
  46 * mode_name
  47 *      Points to the name of the tape mode. This creates a link with that
  48 *      name from the physical device to the logical device (class).
  49 */
  50struct tape_class_device *register_tape_dev(
  51        struct device *         device,
  52        dev_t                   dev,
  53        const struct file_operations *fops,
  54        char *                  device_name,
  55        char *                  node_name
  56);
  57void unregister_tape_dev(struct device *device, struct tape_class_device *tcd);
  58
  59#endif /* __TAPE_CLASS_H__ */
  60