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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/s390/char/tape_class.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/s390/char/tape_class.c')
-rw-r--r-- | drivers/s390/char/tape_class.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/s390/char/tape_class.c b/drivers/s390/char/tape_class.c new file mode 100644 index 0000000000..277a0f903d --- /dev/null +++ b/drivers/s390/char/tape_class.c @@ -0,0 +1,132 @@ +// 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); + + strscpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN); + for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/')) + *s = '!'; + strscpy(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_ERR_OR_ZERO(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); +} +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); + } +} +EXPORT_SYMBOL(unregister_tape_dev); + + +static int __init tape_init(void) +{ + tape_class = class_create("tape390"); + + return 0; +} + +static void __exit tape_exit(void) +{ + class_destroy(tape_class); + tape_class = NULL; +} + +postcore_initcall(tape_init); +module_exit(tape_exit); |