drivers/s390/char/tape_class.h

   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
  26 struct tape_class_device {
  27         struct cdev *           char_device;
  28         struct class_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  */
  52 struct 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 );
  59 void unregister_tape_dev(struct tape_class_device *tcd);
  60
  61 #endif /* __TAPE_CLASS_H__ */