drivers/s390/char/tape_class.h

   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
  23 struct 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  */
  49 struct 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 );
  56 void unregister_tape_dev(struct device *device, struct tape_class_device *tcd);
  57
  58 #endif /* __TAPE_CLASS_H__ */