completed the code
This commit is contained in:
parent
3e5ec66892
commit
809bfbd627
10
Code/Makefile
Normal file
10
Code/Makefile
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@ -0,0 +1,10 @@
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obj-m += vinput.o
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obj-m += vkbd.o
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PWD := $(CURDIR)
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all:
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make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
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clean:
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make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
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403
Code/vinput.c
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403
Code/vinput.c
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@ -0,0 +1,403 @@
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/*
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* vinput.c
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*/
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#include <linux/cdev.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <asm/uaccess.h>
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#include "vinput.h"
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#define DRIVER_NAME "vinput"
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#define dev_to_vinput(dev) container_of(dev, struct vinput, dev)
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static DECLARE_BITMAP(vinput_ids, VINPUT_MINORS);
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static LIST_HEAD(vinput_devices);
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static LIST_HEAD(vinput_vdevices);
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static int vinput_dev;
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static struct spinlock vinput_lock;
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static struct class vinput_class;
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/* Search the name of vinput device in the vinput_devices linked list,
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* which added at vinput_register().
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*/
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static struct vinput_device *vinput_get_device_by_type(const char *type)
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{
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int found = 0;
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struct vinput_device *vinput;
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struct list_head *curr;
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spin_lock(&vinput_lock);
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list_for_each (curr, &vinput_devices) {
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vinput = list_entry(curr, struct vinput_device, list);
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if (vinput && strncmp(type, vinput->name, strlen(vinput->name)) == 0) {
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found = 1;
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break;
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}
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}
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spin_unlock(&vinput_lock);
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if (found)
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return vinput;
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return ERR_PTR(-ENODEV);
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}
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/* Search the id of virtual device in the vinput_vdevices linked list,
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* which added at vinput_alloc_vdevice().
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*/
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static struct vinput *vinput_get_vdevice_by_id(long id)
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{
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struct vinput *vinput = NULL;
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struct list_head *curr;
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spin_lock(&vinput_lock);
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list_for_each (curr, &vinput_vdevices) {
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vinput = list_entry(curr, struct vinput, list);
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if (vinput && vinput->id == id)
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break;
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}
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spin_unlock(&vinput_lock);
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if (vinput && vinput->id == id)
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return vinput;
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return ERR_PTR(-ENODEV);
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}
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static int vinput_open(struct inode *inode, struct file *file)
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{
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int err = 0;
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struct vinput *vinput = NULL;
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vinput = vinput_get_vdevice_by_id(iminor(inode));
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if (IS_ERR(vinput))
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err = PTR_ERR(vinput);
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else
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file->private_data = vinput;
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return err;
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}
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static int vinput_release(struct inode *inode, struct file *file)
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{
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return 0;
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}
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static ssize_t vinput_read(struct file *file, char __user *buffer, size_t count,
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loff_t *offset)
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{
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int len;
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char buff[VINPUT_MAX_LEN + 1];
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struct vinput *vinput = file->private_data;
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len = vinput->type->ops->read(vinput, buff, count);
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if (*offset > len)
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count = 0;
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else if (count + *offset > VINPUT_MAX_LEN)
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count = len - *offset;
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if (raw_copy_to_user(buffer, buff + *offset, count))
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count = -EFAULT;
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*offset += count;
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return count;
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}
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static ssize_t vinput_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *offset)
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{
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char buff[VINPUT_MAX_LEN + 1];
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struct vinput *vinput = file->private_data;
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memset(buff, 0, sizeof(char) * (VINPUT_MAX_LEN + 1));
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if (count > VINPUT_MAX_LEN) {
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dev_warn(&vinput->dev, "Too long. %d bytes allowed\n", VINPUT_MAX_LEN);
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return -EINVAL;
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}
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if (raw_copy_from_user(buff, buffer, count))
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return -EFAULT;
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return vinput->type->ops->send(vinput, buff, count);
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}
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static const struct file_operations vinput_fops = {
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.owner = THIS_MODULE,
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.open = vinput_open,
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.release = vinput_release,
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.read = vinput_read,
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.write = vinput_write,
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};
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static void vinput_unregister_vdevice(struct vinput *vinput)
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{
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input_unregister_device(vinput->input);
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if (vinput->type->ops->kill)
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vinput->type->ops->kill(vinput);
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}
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static void vinput_destroy_vdevice(struct vinput *vinput)
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{
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/* Remove from the list first */
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spin_lock(&vinput_lock);
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list_del(&vinput->list);
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clear_bit(vinput->id, vinput_ids);
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spin_unlock(&vinput_lock);
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module_put(THIS_MODULE);
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kfree(vinput);
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}
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static void vinput_release_dev(struct device *dev)
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{
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struct vinput *vinput = dev_to_vinput(dev);
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int id = vinput->id;
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vinput_destroy_vdevice(vinput);
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pr_debug("released vinput%d.\n", id);
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}
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static struct vinput *vinput_alloc_vdevice(void)
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{
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int err;
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struct vinput *vinput = kzalloc(sizeof(struct vinput), GFP_KERNEL);
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try_module_get(THIS_MODULE);
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memset(vinput, 0, sizeof(struct vinput));
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spin_lock_init(&vinput->lock);
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spin_lock(&vinput_lock);
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vinput->id = find_first_zero_bit(vinput_ids, VINPUT_MINORS);
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if (vinput->id >= VINPUT_MINORS) {
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err = -ENOBUFS;
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goto fail_id;
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}
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set_bit(vinput->id, vinput_ids);
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list_add(&vinput->list, &vinput_vdevices);
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spin_unlock(&vinput_lock);
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/* allocate the input device */
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vinput->input = input_allocate_device();
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if (vinput->input == NULL) {
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pr_err("vinput: Cannot allocate vinput input device\n");
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err = -ENOMEM;
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goto fail_input_dev;
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}
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/* initialize device */
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vinput->dev.class = &vinput_class;
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vinput->dev.release = vinput_release_dev;
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vinput->dev.devt = MKDEV(vinput_dev, vinput->id);
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dev_set_name(&vinput->dev, DRIVER_NAME "%lu", vinput->id);
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return vinput;
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fail_input_dev:
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spin_lock(&vinput_lock);
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list_del(&vinput->list);
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fail_id:
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spin_unlock(&vinput_lock);
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module_put(THIS_MODULE);
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kfree(vinput);
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return ERR_PTR(err);
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}
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static int vinput_register_vdevice(struct vinput *vinput)
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{
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int err = 0;
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/* register the input device */
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vinput->input->name = vinput->type->name;
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vinput->input->phys = "vinput";
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vinput->input->dev.parent = &vinput->dev;
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vinput->input->id.bustype = BUS_VIRTUAL;
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vinput->input->id.product = 0x0000;
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vinput->input->id.vendor = 0x0000;
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vinput->input->id.version = 0x0000;
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err = vinput->type->ops->init(vinput);
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if (err == 0)
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dev_info(&vinput->dev, "Registered virtual input %s %ld\n",
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vinput->type->name, vinput->id);
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return err;
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}
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static ssize_t export_store(struct class *class, struct class_attribute *attr,
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const char *buf, size_t len)
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{
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int err;
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struct vinput *vinput;
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struct vinput_device *device;
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device = vinput_get_device_by_type(buf);
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if (IS_ERR(device)) {
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pr_info("vinput: This virtual device isn't registered\n");
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err = PTR_ERR(device);
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goto fail;
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}
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vinput = vinput_alloc_vdevice();
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if (IS_ERR(vinput)) {
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err = PTR_ERR(vinput);
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goto fail;
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}
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vinput->type = device;
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err = device_register(&vinput->dev);
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if (err < 0)
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goto fail_register;
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err = vinput_register_vdevice(vinput);
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if (err < 0)
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goto fail_register_vinput;
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return len;
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fail_register_vinput:
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device_unregister(&vinput->dev);
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fail_register:
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vinput_destroy_vdevice(vinput);
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fail:
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return err;
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}
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/* This macro generates class_attr_export structure and export_store() */
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static CLASS_ATTR_WO(export);
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static ssize_t unexport_store(struct class *class, struct class_attribute *attr,
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const char *buf, size_t len)
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{
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int err;
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unsigned long id;
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struct vinput *vinput;
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err = kstrtol(buf, 10, &id);
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if (err) {
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err = -EINVAL;
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goto failed;
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}
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vinput = vinput_get_vdevice_by_id(id);
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if (IS_ERR(vinput)) {
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pr_err("vinput: No such vinput device %ld\n", id);
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err = PTR_ERR(vinput);
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goto failed;
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}
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vinput_unregister_vdevice(vinput);
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device_unregister(&vinput->dev);
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return len;
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failed:
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return err;
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}
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/* This macro generates class_attr_unexport structure and unexport_store() */
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static CLASS_ATTR_WO(unexport);
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static struct attribute *vinput_class_attrs[] = {
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&class_attr_export.attr,
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&class_attr_unexport.attr,
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NULL,
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};
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/* This macro generates vinput_class_groups structure */
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ATTRIBUTE_GROUPS(vinput_class);
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static struct class vinput_class = {
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.name = "vinput",
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.owner = THIS_MODULE,
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.class_groups = vinput_class_groups,
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};
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int vinput_register(struct vinput_device *dev)
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{
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spin_lock(&vinput_lock);
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list_add(&dev->list, &vinput_devices);
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spin_unlock(&vinput_lock);
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pr_info("vinput: registered new virtual input device '%s'\n", dev->name);
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return 0;
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}
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EXPORT_SYMBOL(vinput_register);
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void vinput_unregister(struct vinput_device *dev)
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{
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struct list_head *curr, *next;
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/* Remove from the list first */
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spin_lock(&vinput_lock);
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list_del(&dev->list);
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spin_unlock(&vinput_lock);
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/* unregister all devices of this type */
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list_for_each_safe (curr, next, &vinput_vdevices) {
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struct vinput *vinput = list_entry(curr, struct vinput, list);
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if (vinput && vinput->type == dev) {
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vinput_unregister_vdevice(vinput);
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device_unregister(&vinput->dev);
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}
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}
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pr_info("vinput: unregistered virtual input device '%s'\n", dev->name);
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}
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EXPORT_SYMBOL(vinput_unregister);
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static int __init vinput_init(void)
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{
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int err = 0;
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pr_info("vinput: Loading virtual input driver\n");
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vinput_dev = register_chrdev(0, DRIVER_NAME, &vinput_fops);
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if (vinput_dev < 0) {
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pr_err("vinput: Unable to allocate char dev region\n");
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err = vinput_dev;
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goto failed_alloc;
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}
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spin_lock_init(&vinput_lock);
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err = class_register(&vinput_class);
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if (err < 0) {
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pr_err("vinput: Unable to register vinput class\n");
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goto failed_class;
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}
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return 0;
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failed_class:
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class_unregister(&vinput_class);
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failed_alloc:
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return err;
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}
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static void __exit vinput_end(void)
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{
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pr_info("vinput: Unloading virtual input driver\n");
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unregister_chrdev(vinput_dev, DRIVER_NAME);
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class_unregister(&vinput_class);
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}
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module_init(vinput_init);
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module_exit(vinput_end);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Emulate input events");
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49
Code/vinput.h
Normal file
49
Code/vinput.h
Normal file
@ -0,0 +1,49 @@
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/*
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* vinput.h
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*/
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#ifndef VINPUT_H
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#define VINPUT_H
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#include <linux/input.h>
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#include <linux/spinlock.h>
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#define VINPUT_MAX_LEN 128
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#define MAX_VINPUT 32
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#define VINPUT_MINORS MAX_VINPUT
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#define dev_to_vinput(dev) container_of(dev, struct vinput, dev)
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struct vinput_device;
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struct vinput {
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long id;
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long devno;
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long last_entry;
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spinlock_t lock;
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void *priv_data;
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struct device dev;
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struct list_head list;
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struct input_dev *input;
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struct vinput_device *type;
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};
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struct vinput_ops {
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int (*init)(struct vinput *);
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int (*kill)(struct vinput *);
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int (*send)(struct vinput *, char *, int);
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int (*read)(struct vinput *, char *, int);
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};
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struct vinput_device {
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char name[16];
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struct list_head list;
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struct vinput_ops *ops;
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};
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int vinput_register(struct vinput_device *dev);
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void vinput_unregister(struct vinput_device *dev);
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#endif
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110
Code/vkbd.c
Normal file
110
Code/vkbd.c
Normal file
@ -0,0 +1,110 @@
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/*
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* vkbd.c
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*/
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include "vinput.h"
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#define VINPUT_KBD "vkbd"
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#define VINPUT_RELEASE 0
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#define VINPUT_PRESS 1
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static unsigned short vkeymap[KEY_MAX];
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static int vinput_vkbd_init(struct vinput *vinput)
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{
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int i;
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/* Set up the input bitfield */
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vinput->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
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vinput->input->keycodesize = sizeof(unsigned short);
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vinput->input->keycodemax = KEY_MAX;
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vinput->input->keycode = vkeymap;
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for (i = 0; i < KEY_MAX; i++)
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set_bit(vkeymap[i], vinput->input->keybit);
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|
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/* vinput will help us allocate new input device structure via
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* input_allocate_device(). So, we can register it straightforwardly.
|
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*/
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return input_register_device(vinput->input);
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}
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|
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static int vinput_vkbd_read(struct vinput *vinput, char *buff, int len)
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{
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spin_lock(&vinput->lock);
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len = snprintf(buff, len, "%+ld\n", vinput->last_entry);
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spin_unlock(&vinput->lock);
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|
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return len;
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}
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|
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static int vinput_vkbd_send(struct vinput *vinput, char *buff, int len)
|
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{
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int ret;
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long key = 0;
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short type = VINPUT_PRESS;
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/* Determine which event was received (press or release)
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* and store the state.
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*/
|
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if (buff[0] == '+')
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ret = kstrtol(buff + 1, 10, &key);
|
||||
else
|
||||
ret = kstrtol(buff, 10, &key);
|
||||
if (ret)
|
||||
dev_err(&vinput->dev, "error during kstrtol: -%d\n", ret);
|
||||
spin_lock(&vinput->lock);
|
||||
vinput->last_entry = key;
|
||||
spin_unlock(&vinput->lock);
|
||||
|
||||
if (key < 0) {
|
||||
type = VINPUT_RELEASE;
|
||||
key = -key;
|
||||
}
|
||||
|
||||
dev_info(&vinput->dev, "Event %s code %ld\n",
|
||||
(type == VINPUT_RELEASE) ? "VINPUT_RELEASE" : "VINPUT_PRESS", key);
|
||||
|
||||
/* Report the state received to input subsystem. */
|
||||
input_report_key(vinput->input, key, type);
|
||||
/* Tell input subsystem that it finished the report. */
|
||||
input_sync(vinput->input);
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static struct vinput_ops vkbd_ops = {
|
||||
.init = vinput_vkbd_init,
|
||||
.send = vinput_vkbd_send,
|
||||
.read = vinput_vkbd_read,
|
||||
};
|
||||
|
||||
static struct vinput_device vkbd_dev = {
|
||||
.name = VINPUT_KBD,
|
||||
.ops = &vkbd_ops,
|
||||
};
|
||||
|
||||
static int __init vkbd_init(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < KEY_MAX; i++)
|
||||
vkeymap[i] = i;
|
||||
return vinput_register(&vkbd_dev);
|
||||
}
|
||||
|
||||
static void __exit vkbd_end(void)
|
||||
{
|
||||
vinput_unregister(&vkbd_dev);
|
||||
}
|
||||
|
||||
module_init(vkbd_init);
|
||||
module_exit(vkbd_end);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("Emulate keyboard input events through /dev/vinput");
|
||||
@ -1,2 +1,9 @@
|
||||
# Homework_Lesson_8
|
||||
|
||||
## Assignment
|
||||
Create a virtual keyboard using the kernel module,
|
||||
which simulates a key press on a virtual input device /dev/vinput0.
|
||||
Echo some keycode to the virtual input device and get the key message on the standard output.
|
||||
Compile and run the program.
|
||||
Submit the source code and the screen shots of the standard output and the kernel log message,
|
||||
respectively, when the keycode is echoed to the virtual input device.
|
||||
13
output.txt
Normal file
13
output.txt
Normal file
@ -0,0 +1,13 @@
|
||||
vkbd
|
||||
+36
|
||||
-36
|
||||
0
|
||||
==================================================
|
||||
[Mon Nov 28 11:09:58 2022] vinput: Loading virtual input driver
|
||||
[Mon Nov 28 11:09:58 2022] vinput: registered new virtual input device 'vkbd'
|
||||
[Mon Nov 28 11:09:58 2022] input: vkbd as /devices/virtual/vinput/vinput0/input19
|
||||
[Mon Nov 28 11:09:58 2022] vinput vinput0: Registered virtual input vkbd 0
|
||||
[Mon Nov 28 11:09:59 2022] vinput vinput0: Event VINPUT_PRESS code 36
|
||||
[Mon Nov 28 11:10:04 2022] vinput vinput0: Event VINPUT_RELEASE code 36
|
||||
[Mon Nov 28 11:10:05 2022] vinput: unregistered virtual input device 'vkbd'
|
||||
[Mon Nov 28 11:10:05 2022] vinput: Unloading virtual input driver
|
||||
18
run.sh
Normal file
18
run.sh
Normal file
@ -0,0 +1,18 @@
|
||||
cd ./Code
|
||||
make
|
||||
sudo insmod vinput.ko
|
||||
sudo insmod vkbd.ko
|
||||
echo "vkbd" | sudo tee /sys/class/vinput/export > ../output.txt
|
||||
sleep 1
|
||||
echo "+36" | sudo tee /dev/vinput0 >> ../output.txt
|
||||
sleep 5
|
||||
echo "-36" | sudo tee /dev/vinput0 >> ../output.txt
|
||||
sleep 1
|
||||
echo "0" | sudo tee /sys/class/vinput/unexport >> ../output.txt
|
||||
echo "==================================================" >> ../output.txt
|
||||
sudo rmmod vkbd
|
||||
sudo rmmod vinput
|
||||
sleep 5
|
||||
cd ../
|
||||
sudo dmesg -T -l info | tail -8 >> output.txt
|
||||
echo "Done"
|
||||
Loading…
x
Reference in New Issue
Block a user