a53c8fab3f
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
/*
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* Copyright IBM Corp. 2004
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*
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* Tape class device support
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*
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* Author: Stefan Bader <shbader@de.ibm.com>
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* Based on simple class device code by Greg K-H
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*/
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#define KMSG_COMPONENT "tape"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/slab.h>
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#include "tape_class.h"
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MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
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MODULE_DESCRIPTION(
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"Copyright IBM Corp. 2004 All Rights Reserved.\n"
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"tape_class.c"
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);
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MODULE_LICENSE("GPL");
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static struct class *tape_class;
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/*
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* Register a tape device and return a pointer to the cdev structure.
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*
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* device
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* The pointer to the struct device of the physical (base) device.
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* drivername
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* The pointer to the drivers name for it's character devices.
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* dev
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* The intended major/minor number. The major number may be 0 to
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* get a dynamic major number.
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* fops
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* The pointer to the drivers file operations for the tape device.
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* devname
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* The pointer to the name of the character device.
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*/
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struct tape_class_device *register_tape_dev(
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struct device * device,
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dev_t dev,
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const struct file_operations *fops,
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char * device_name,
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char * mode_name)
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{
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struct tape_class_device * tcd;
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int rc;
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char * s;
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tcd = kzalloc(sizeof(struct tape_class_device), GFP_KERNEL);
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if (!tcd)
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return ERR_PTR(-ENOMEM);
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strncpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN);
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for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/'))
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*s = '!';
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strncpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN);
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for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/'))
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*s = '!';
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tcd->char_device = cdev_alloc();
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if (!tcd->char_device) {
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rc = -ENOMEM;
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goto fail_with_tcd;
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}
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tcd->char_device->owner = fops->owner;
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tcd->char_device->ops = fops;
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tcd->char_device->dev = dev;
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rc = cdev_add(tcd->char_device, tcd->char_device->dev, 1);
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if (rc)
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goto fail_with_cdev;
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tcd->class_device = device_create(tape_class, device,
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tcd->char_device->dev, NULL,
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"%s", tcd->device_name);
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rc = IS_ERR(tcd->class_device) ? PTR_ERR(tcd->class_device) : 0;
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if (rc)
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goto fail_with_cdev;
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rc = sysfs_create_link(
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&device->kobj,
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&tcd->class_device->kobj,
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tcd->mode_name
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);
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if (rc)
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goto fail_with_class_device;
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return tcd;
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fail_with_class_device:
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device_destroy(tape_class, tcd->char_device->dev);
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fail_with_cdev:
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cdev_del(tcd->char_device);
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fail_with_tcd:
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kfree(tcd);
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return ERR_PTR(rc);
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}
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EXPORT_SYMBOL(register_tape_dev);
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void unregister_tape_dev(struct device *device, struct tape_class_device *tcd)
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{
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if (tcd != NULL && !IS_ERR(tcd)) {
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sysfs_remove_link(&device->kobj, tcd->mode_name);
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device_destroy(tape_class, tcd->char_device->dev);
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cdev_del(tcd->char_device);
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kfree(tcd);
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}
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}
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EXPORT_SYMBOL(unregister_tape_dev);
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static int __init tape_init(void)
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{
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tape_class = class_create(THIS_MODULE, "tape390");
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return 0;
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}
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static void __exit tape_exit(void)
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{
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class_destroy(tape_class);
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tape_class = NULL;
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}
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postcore_initcall(tape_init);
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module_exit(tape_exit);
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