Initial commit

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

modules/cas_cache/control.c

@@ -0,0 +1,80 @@
+/*
+* Copyright(c) 2012-2019 Intel Corporation
+* SPDX-License-Identifier: BSD-3-Clause-Clear
+*/
+#include <linux/cdev.h>
+#include <linux/fs.h>
+#include "linux_kernel_version.h"
+#include "service_ui_ioctl.h"
+#include "control.h"
+#include "cas_cache/cas_cache.h"
+
+struct cas_ctrl_device {
+	struct cdev cdev;
+	struct class *class;
+	dev_t dev;
+};
+
+static struct cas_ctrl_device _control_device;
+
+static const struct file_operations _ctrl_dev_fops = {
+	.owner = THIS_MODULE,
+	.unlocked_ioctl = cas_service_ioctl_ctrl
+};
+
+int __init cas_ctrl_device_init(void)
+{
+	struct cas_ctrl_device *ctrl = &_control_device;
+	struct device *device;
+	int result = 0;
+
+	result = alloc_chrdev_region(&ctrl->dev, 0, 1, "cas");
+	if (result) {
+		printk(KERN_ERR "Cannot allocate control chrdev number.\n");
+		goto error_alloc_chrdev_region;
+	}
+
+	cdev_init(&ctrl->cdev, &_ctrl_dev_fops);
+
+	result = cdev_add(&ctrl->cdev, ctrl->dev, 1);
+	if (result) {
+		printk(KERN_ERR "Cannot add control chrdev.\n");
+		goto error_cdev_add;
+	}
+
+	ctrl->class = class_create(THIS_MODULE, "cas");
+	if (IS_ERR(ctrl->class)) {
+		printk(KERN_ERR "Cannot create control chrdev class.\n");
+		result = PTR_ERR(ctrl->class);
+		goto error_class_create;
+	}
+
+	device = device_create(ctrl->class, NULL, ctrl->dev, NULL,
+			"cas_ctrl");
+	if (IS_ERR(device)) {
+		printk(KERN_ERR "Cannot create control chrdev.\n");
+		result = PTR_ERR(device);
+		goto error_device_create;
+	}
+
+	return result;
+
+error_device_create:
+	class_destroy(ctrl->class);
+error_class_create:
+	cdev_del(&ctrl->cdev);
+error_cdev_add:
+	unregister_chrdev_region(ctrl->dev, 1);
+error_alloc_chrdev_region:
+	return result;
+}
+
+void __exit cas_ctrl_device_deinit(void)
+{
+	struct cas_ctrl_device *ctrl = &_control_device;
+
+	device_destroy(ctrl->class, ctrl->dev);
+	class_destroy(ctrl->class);
+	cdev_del(&ctrl->cdev);
+	unregister_chrdev_region(ctrl->dev, 1);
+}