acec05060d
Change license to BSD-3-Clause Signed-off-by: Rafal Stefanowski <rafal.stefanowski@intel.com>
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/*
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* Copyright(c) 2012-2021 Intel Corporation
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <linux/cdev.h>
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#include <linux/fs.h>
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#include "linux_kernel_version.h"
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#include "service_ui_ioctl.h"
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#include "control.h"
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#include "cas_cache/cas_cache.h"
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struct cas_ctrl_device {
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struct cdev cdev;
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struct class *class;
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dev_t dev;
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};
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static struct cas_ctrl_device _control_device;
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static const struct file_operations _ctrl_dev_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = cas_service_ioctl_ctrl
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};
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int __init cas_ctrl_device_init(void)
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{
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struct cas_ctrl_device *ctrl = &_control_device;
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struct device *device;
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int result = 0;
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result = alloc_chrdev_region(&ctrl->dev, 0, 1, "cas");
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if (result) {
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printk(KERN_ERR "Cannot allocate control chrdev number.\n");
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goto error_alloc_chrdev_region;
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}
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cdev_init(&ctrl->cdev, &_ctrl_dev_fops);
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result = cdev_add(&ctrl->cdev, ctrl->dev, 1);
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if (result) {
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printk(KERN_ERR "Cannot add control chrdev.\n");
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goto error_cdev_add;
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}
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ctrl->class = class_create(THIS_MODULE, "cas");
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if (IS_ERR(ctrl->class)) {
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printk(KERN_ERR "Cannot create control chrdev class.\n");
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result = PTR_ERR(ctrl->class);
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goto error_class_create;
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}
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device = device_create(ctrl->class, NULL, ctrl->dev, NULL,
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"cas_ctrl");
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if (IS_ERR(device)) {
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printk(KERN_ERR "Cannot create control chrdev.\n");
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result = PTR_ERR(device);
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goto error_device_create;
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}
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return result;
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error_device_create:
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class_destroy(ctrl->class);
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error_class_create:
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cdev_del(&ctrl->cdev);
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error_cdev_add:
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unregister_chrdev_region(ctrl->dev, 1);
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error_alloc_chrdev_region:
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return result;
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}
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void __exit cas_ctrl_device_deinit(void)
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{
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struct cas_ctrl_device *ctrl = &_control_device;
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device_destroy(ctrl->class, ctrl->dev);
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class_destroy(ctrl->class);
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cdev_del(&ctrl->cdev);
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unregister_chrdev_region(ctrl->dev, 1);
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}
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