Release 4.18 drivers/s390/char/tape_class.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright IBM Corp. 2004
 *
 * Tape class device support
 *
 * Author: Stefan Bader <shbader@de.ibm.com>
 * Based on simple class device code by Greg K-H
 */


#define KMSG_COMPONENT "tape"

#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/slab.h>

#include "tape_class.h"

MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
MODULE_DESCRIPTION(
	"Copyright IBM Corp. 2004   All Rights Reserved.\n"
	"tape_class.c"
);
MODULE_LICENSE("GPL");


static struct class *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,
	const struct file_operations *fops,
	char *			device_name,
	char *			mode_name)
{
	struct tape_class_device *	tcd;
	int		rc;
	char *		s;

	tcd = kzalloc(sizeof(struct tape_class_device), GFP_KERNEL);
	if (!tcd)
		return ERR_PTR(-ENOMEM);

	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;

	rc = cdev_add(tcd->char_device, dev, 1);
	if (rc)
		goto fail_with_cdev;

	tcd->class_device = device_create(tape_class, device,
					  tcd->char_device->dev, NULL,
					  "%s", tcd->device_name);
	rc = PTR_RET(tcd->class_device);
	if (rc)
		goto fail_with_cdev;
	rc = sysfs_create_link(
		&device->kobj,
		&tcd->class_device->kobj,
		tcd->mode_name
	);
	if (rc)
		goto fail_with_class_device;

	return tcd;

fail_with_class_device:
	device_destroy(tape_class, tcd->char_device->dev);

fail_with_cdev:
	cdev_del(tcd->char_device);

fail_with_tcd:
	kfree(tcd);

	return ERR_PTR(rc);
}
Contributors
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Commits
CommitProp
Andrew Morton
270
85.71%
2
18.18%
Heiko Carstens
36
11.43%
2
18.18%
Greg Kroah-Hartman
4
1.27%
3
27.27%
Cornelia Huck
2
0.63%
1
9.09%
Eric Sesterhenn / Snakebyte
1
0.32%
1
9.09%
Arjan van de Ven
1
0.32%
1
9.09%
Thomas Meyer
1
0.32%
1
9.09%
Total
315
100.00%
11
100.00%

EXPORT_SYMBOL(register_tape_dev);



void unregister_tape_dev(struct device *device, struct tape_class_device *tcd)
{
	if (tcd != NULL && !IS_ERR(tcd)) {
		sysfs_remove_link(&device->kobj, tcd->mode_name);
		device_destroy(tape_class, tcd->char_device->dev);
		cdev_del(tcd->char_device);
		kfree(tcd);
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
55
85.94%
2
40.00%
Michael Holzheu
6
9.38%
1
20.00%
Greg Kroah-Hartman
2
3.12%
1
20.00%
Cornelia Huck
1
1.56%
1
20.00%
Total
64
100.00%
5
100.00%

EXPORT_SYMBOL(unregister_tape_dev);




static int __init tape_init(void)
{
	tape_class = class_create(THIS_MODULE, "tape390");

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
20
95.24%
2
66.67%
Greg Kroah-Hartman
1
4.76%
1
33.33%
Total
21
100.00%
3
100.00%



static void __exit tape_exit(void)
{
	class_destroy(tape_class);
	tape_class = NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
17
94.44%
2
66.67%
Greg Kroah-Hartman
1
5.56%
1
33.33%
Total
18
100.00%
3
100.00%

postcore_initcall(tape_init);
module_exit(tape_exit);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
404
84.17%
2
11.11%
Heiko Carstens
39
8.12%
4
22.22%
Michael Holzheu
17
3.54%
2
11.11%
Greg Kroah-Hartman
11
2.29%
5
27.78%
Cornelia Huck
3
0.62%
1
5.56%
Tejun Heo
3
0.62%
1
5.56%
Thomas Meyer
1
0.21%
1
5.56%
Eric Sesterhenn / Snakebyte
1
0.21%
1
5.56%
Arjan van de Ven
1
0.21%
1
5.56%
Total
480
100.00%
18
100.00%
Directory: drivers/s390/char

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