1 files changed, 126 insertions, 0 deletions

diff --git a/drivers/s390/char/tape_class.c b/drivers/s390/char/tape_class.c
new file mode 100644
index 000000000000..0f8ffd4167ca
--- /dev/null
+++ b/drivers/s390/char/tape_class.c
@@ -0,0 +1,126 @@
+/*
+ * (C) Copyright IBM Corp. 2004
+ * tape_class.c ($Revision: 1.8 $)
+ *
+ * Tape class device support
+ *
+ * Author: Stefan Bader <shbader@de.ibm.com>
+ * Based on simple class device code by Greg K-H
+ */
+#include "tape_class.h"
+
+MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
+MODULE_DESCRIPTION(
+        "(C) Copyright IBM Corp. 2004   All Rights Reserved.\n"
+        "tape_class.c ($Revision: 1.8 $)"
+);
+MODULE_LICENSE("GPL");
+
+struct class_simple *tape_class;
+
+/*
+ * Register a tape device and return a pointer to the cdev structure.
+ *
+ * device
+ *      The pointer to the struct device of the physical (base) device.
+ * drivername
+ *      The pointer to the drivers name for it's character devices.
+ * dev
+ *      The intended major/minor number. The major number may be 0 to
+ *      get a dynamic major number.
+ * fops
+ *      The pointer to the drivers file operations for the tape device.
+ * devname
+ *      The pointer to the name of the character device.
+ */
+struct tape_class_device *register_tape_dev(
+        struct device *         device,
+        dev_t                   dev,
+        struct file_operations *fops,
+        char *                  device_name,
+        char *                  mode_name)
+{
+        struct tape_class_device *      tcd;
+        int             rc;
+        char *          s;
+
+        tcd = kmalloc(sizeof(struct tape_class_device), GFP_KERNEL);
+        if (!tcd)
+                return ERR_PTR(-ENOMEM);
+
+        memset(tcd, 0, sizeof(struct tape_class_device));
+        strncpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN);
+        for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/'))
+                *s = '!';
+        strncpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN);
+        for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/'))
+                *s = '!';
+
+        tcd->char_device = cdev_alloc();
+        if (!tcd->char_device) {
+                rc = -ENOMEM;
+                goto fail_with_tcd;
+        }
+
+        tcd->char_device->owner = fops->owner;
+        tcd->char_device->ops   = fops;
+        tcd->char_device->dev   = dev;
+
+        rc = cdev_add(tcd->char_device, tcd->char_device->dev, 1);
+        if (rc)
+                goto fail_with_cdev;
+
+        tcd->class_device = class_simple_device_add(
+                                tape_class,
+                                tcd->char_device->dev,
+                                device,
+                                "%s", tcd->device_name
+                        );
+        sysfs_create_link(
+                &device->kobj,
+                &tcd->class_device->kobj,
+                tcd->mode_name
+        );
+
+        return tcd;
+
+fail_with_cdev:
+        cdev_del(tcd->char_device);
+
+fail_with_tcd:
+        kfree(tcd);
+
+        return ERR_PTR(rc);
+}
+EXPORT_SYMBOL(register_tape_dev);
+
+void unregister_tape_dev(struct tape_class_device *tcd)
+{
+        if (tcd != NULL && !IS_ERR(tcd)) {
+                sysfs_remove_link(
+                        &tcd->class_device->dev->kobj,
+                        tcd->mode_name
+                );
+                class_simple_device_remove(tcd->char_device->dev);
+                cdev_del(tcd->char_device);
+                kfree(tcd);
+        }
+}
+EXPORT_SYMBOL(unregister_tape_dev);
+
+
+static int __init tape_init(void)
+{
+        tape_class = class_simple_create(THIS_MODULE, "tape390");
+
+        return 0;
+}
+
+static void __exit tape_exit(void)
+{
+        class_simple_destroy(tape_class);
+        tape_class = NULL;
+}
+
+postcore_initcall(tape_init);
+module_exit(tape_exit);