69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/device.h>
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#include "my-ioctl.h"
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MODULE_DESCRIPTION("Chardev Ioctl kernel module.");
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MODULE_VERSION("0.0.1");
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MODULE_AUTHOR("Imbus");
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MODULE_LICENSE("GPL");
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#define DEVICE_NAME "hello_ioctl"
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static int major; /* Dynamically assigned */
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static struct class *cls;
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static long my_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
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/* See: https://elixir.bootlin.com/linux/v6.14.5/source/include/linux/fs.h#L2131 */
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static const struct file_operations fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = my_ioctl,
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};
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static long my_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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pr_info("Ioctl called by %s...\n", current->comm);
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switch (cmd) {
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case MY_IOCTL_FILL:
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pr_info("Ioctl FILL by %s...\n", current->comm);
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break;
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case MY_IOCTL_WIPE:
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pr_info("Ioctl WIPE by %s...\n", current->comm);
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break;
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default:
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return -ENOTTY; // Invalid command
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}
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return 0;
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}
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static int __init demo_mod_init(void)
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{
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major = register_chrdev(0, DEVICE_NAME, &fops);
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if (major < 0) {
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pr_info(DEVICE_NAME " - Error registering chrdev\n");
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return major;
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}
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pr_info(DEVICE_NAME " was assigned major number %d.\n", major);
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cls = class_create(DEVICE_NAME);
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device_create(cls, NULL, MKDEV(major, 0), NULL, DEVICE_NAME);
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pr_info(DEVICE_NAME " created on /dev/%s\n", DEVICE_NAME);
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pr_info(DEVICE_NAME " major nbr %d loaded successfully...\n", major);
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return 0;
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}
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static void __exit demo_mod_exit(void)
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{
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device_destroy(cls, MKDEV(major, 0));
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class_destroy(cls);
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unregister_chrdev(major, DEVICE_NAME);
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pr_info(DEVICE_NAME " unloaded successfully...\n");
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}
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module_init(demo_mod_init);
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module_exit(demo_mod_exit);
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