70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
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/*
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* Copyright (C) 2016 Samsung Electronics, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/fs.h>
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#include "tz_cdev.h"
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static atomic_t tz_cdev_state = ATOMIC_INIT(0);
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int tz_cdev_register(struct tz_cdev *cdev)
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{
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int err;
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err = alloc_chrdev_region(&cdev->dev, 0, 1, cdev->name);
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if (unlikely(err))
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return err;
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cdev->class = class_create(cdev->owner, cdev->name);
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if (IS_ERR(cdev->class)) {
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err = PTR_ERR(cdev->class);
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goto class_create_failed;
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}
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cdev_init(&cdev->cdev, cdev->fops);
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err = cdev_add(&cdev->cdev, cdev->dev, 1);
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if (unlikely(err))
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goto cdev_add_failed;
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cdev->device = device_create(cdev->class,
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NULL, cdev->dev, NULL, cdev->name);
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if (IS_ERR(cdev->device)) {
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err = PTR_ERR(cdev->device);
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goto device_create_failed;
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}
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atomic_set(&tz_cdev_state, 1);
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return 0;
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device_create_failed:
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cdev_del(&cdev->cdev);
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cdev_add_failed:
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class_destroy(cdev->class);
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class_create_failed:
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unregister_chrdev_region(cdev->dev, 1);
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return err;
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}
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void tz_cdev_unregister(struct tz_cdev *cdev)
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{
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if (!atomic_cmpxchg(&tz_cdev_state, 1, 0))
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return;
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device_destroy(cdev->class, cdev->dev);
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cdev_del(&cdev->cdev);
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class_destroy(cdev->class);
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unregister_chrdev_region(cdev->dev, 1);
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}
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