drivers/s390/char/tape_class.h

   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
  24 struct 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  */
  50 struct 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 );
  57 void unregister_tape_dev(struct device *device, struct tape_class_device *tcd);
  58
  59 #endif /* __TAPE_CLASS_H__ */