Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright IBM Corp. 2004 |
| 3 | * tape_class.c ($Revision: 1.8 $) |
| 4 | * |
| 5 | * Tape class device support |
| 6 | * |
| 7 | * Author: Stefan Bader <shbader@de.ibm.com> |
| 8 | * Based on simple class device code by Greg K-H |
| 9 | */ |
| 10 | #include "tape_class.h" |
| 11 | |
| 12 | MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>"); |
| 13 | MODULE_DESCRIPTION( |
| 14 | "(C) Copyright IBM Corp. 2004 All Rights Reserved.\n" |
| 15 | "tape_class.c ($Revision: 1.8 $)" |
| 16 | ); |
| 17 | MODULE_LICENSE("GPL"); |
| 18 | |
gregkh@suse.de | 56b2293 | 2005-03-23 10:01:41 -0800 | [diff] [blame^] | 19 | static struct class *tape_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | /* |
| 22 | * Register a tape device and return a pointer to the cdev structure. |
| 23 | * |
| 24 | * device |
| 25 | * The pointer to the struct device of the physical (base) device. |
| 26 | * drivername |
| 27 | * The pointer to the drivers name for it's character devices. |
| 28 | * dev |
| 29 | * The intended major/minor number. The major number may be 0 to |
| 30 | * get a dynamic major number. |
| 31 | * fops |
| 32 | * The pointer to the drivers file operations for the tape device. |
| 33 | * devname |
| 34 | * The pointer to the name of the character device. |
| 35 | */ |
| 36 | struct tape_class_device *register_tape_dev( |
| 37 | struct device * device, |
| 38 | dev_t dev, |
| 39 | struct file_operations *fops, |
| 40 | char * device_name, |
| 41 | char * mode_name) |
| 42 | { |
| 43 | struct tape_class_device * tcd; |
| 44 | int rc; |
| 45 | char * s; |
| 46 | |
| 47 | tcd = kmalloc(sizeof(struct tape_class_device), GFP_KERNEL); |
| 48 | if (!tcd) |
| 49 | return ERR_PTR(-ENOMEM); |
| 50 | |
| 51 | memset(tcd, 0, sizeof(struct tape_class_device)); |
| 52 | strncpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN); |
| 53 | for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/')) |
| 54 | *s = '!'; |
| 55 | strncpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN); |
| 56 | for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/')) |
| 57 | *s = '!'; |
| 58 | |
| 59 | tcd->char_device = cdev_alloc(); |
| 60 | if (!tcd->char_device) { |
| 61 | rc = -ENOMEM; |
| 62 | goto fail_with_tcd; |
| 63 | } |
| 64 | |
| 65 | tcd->char_device->owner = fops->owner; |
| 66 | tcd->char_device->ops = fops; |
| 67 | tcd->char_device->dev = dev; |
| 68 | |
| 69 | rc = cdev_add(tcd->char_device, tcd->char_device->dev, 1); |
| 70 | if (rc) |
| 71 | goto fail_with_cdev; |
| 72 | |
gregkh@suse.de | 56b2293 | 2005-03-23 10:01:41 -0800 | [diff] [blame^] | 73 | tcd->class_device = class_device_create( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | tape_class, |
| 75 | tcd->char_device->dev, |
| 76 | device, |
| 77 | "%s", tcd->device_name |
| 78 | ); |
| 79 | sysfs_create_link( |
| 80 | &device->kobj, |
| 81 | &tcd->class_device->kobj, |
| 82 | tcd->mode_name |
| 83 | ); |
| 84 | |
| 85 | return tcd; |
| 86 | |
| 87 | fail_with_cdev: |
| 88 | cdev_del(tcd->char_device); |
| 89 | |
| 90 | fail_with_tcd: |
| 91 | kfree(tcd); |
| 92 | |
| 93 | return ERR_PTR(rc); |
| 94 | } |
| 95 | EXPORT_SYMBOL(register_tape_dev); |
| 96 | |
| 97 | void unregister_tape_dev(struct tape_class_device *tcd) |
| 98 | { |
| 99 | if (tcd != NULL && !IS_ERR(tcd)) { |
| 100 | sysfs_remove_link( |
| 101 | &tcd->class_device->dev->kobj, |
| 102 | tcd->mode_name |
| 103 | ); |
gregkh@suse.de | 56b2293 | 2005-03-23 10:01:41 -0800 | [diff] [blame^] | 104 | class_device_destroy(tape_class, tcd->char_device->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | cdev_del(tcd->char_device); |
| 106 | kfree(tcd); |
| 107 | } |
| 108 | } |
| 109 | EXPORT_SYMBOL(unregister_tape_dev); |
| 110 | |
| 111 | |
| 112 | static int __init tape_init(void) |
| 113 | { |
gregkh@suse.de | 56b2293 | 2005-03-23 10:01:41 -0800 | [diff] [blame^] | 114 | tape_class = class_create(THIS_MODULE, "tape390"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | static void __exit tape_exit(void) |
| 120 | { |
gregkh@suse.de | 56b2293 | 2005-03-23 10:01:41 -0800 | [diff] [blame^] | 121 | class_destroy(tape_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | tape_class = NULL; |
| 123 | } |
| 124 | |
| 125 | postcore_initcall(tape_init); |
| 126 | module_exit(tape_exit); |