LXR linux/drivers/s390/char/tape

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