feat(lab03): ex 2 in one file
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@@ -1,133 +0,0 @@
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/kdev_t.h>
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#include <linux/cdev.h>
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#include <linux/minmax.h>
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#include <stddef.h>
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#include <linux/uaccess.h>
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// linux theory: https://linux-kernel-labs.github.io/refs/heads/master/labs/device_drivers.html
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#define MY_MAJOR 42
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#define MY_MAX_MINORS 5
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#define BUFFER_SIZE 300
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struct my_device_data {
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struct cdev cdev;
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/* my data starts here */
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char buffer[BUFFER_SIZE];
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};
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struct my_device_data devs;
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// inode: https://www.kernel.org/doc/html/latest/filesystems/ext4/inodes.html
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// file: https://docs.kernel.org/filesystems/api-summary.html#c.file
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int skeleton_open(struct inode* i, struct file* f) {
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pr_info("Open file\n");
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// Get the stuct of my data
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struct my_device_data *my_data = container_of(i->i_cdev, struct my_device_data, cdev);
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// point private data on driver data, here this is a char buffer
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f->private_data = my_data;
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return 0;
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}
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int skeleton_release(struct inode* i, struct file* f) {
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pr_info("Release file\n");
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return 0;
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}
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ssize_t skeleton_read(struct file* f, char* __user buf, size_t count, loff_t* off) {
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pr_info("Read file\n");
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struct my_device_data *my_data = (struct my_device_data *) f->private_data;
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ssize_t len = min(BUFFER_SIZE - ((size_t)*off), count);
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if (len <= 0) {
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pr_info("Cannot read data for length: %ld\n", len);
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return 0;
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}
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/* read data from my_data->buffer to user buffer */
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if (copy_to_user(buf, my_data->buffer + *off, len)) {
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pr_info("Failed to copy to user space buffer\n");
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return -EFAULT;
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}
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*off += len;
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return len;
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}
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ssize_t skeleton_write(struct file* f, const char* __user buf, size_t count, loff_t* off) {
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pr_info("Write file\n");
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struct my_device_data *my_data = (struct my_device_data *) f->private_data;
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ssize_t len = min(BUFFER_SIZE - ((size_t)*off), count);
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if (len <= 0) {
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pr_info("Cannot write data for length: %ld\n", len);
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return 0;
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}
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/* read data from user buffer to my_data->buffer */
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if (copy_from_user(my_data->buffer + *off, buf, len)) {
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pr_info("Failed to copy from user space buffer\n");
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return -EFAULT;
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}
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*off += len;
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return len;
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}
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static struct file_operations skeleton_fops = {
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.owner = THIS_MODULE,
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.open = skeleton_open,
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.read = skeleton_read,
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.write = skeleton_write,
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.release = skeleton_release,
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};
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int ex2_init(void) {
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pr_info("Load exercice 2\n");
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int ret = register_chrdev_region(MKDEV(MY_MAJOR, 0), MY_MAX_MINORS, "My module");
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if (ret != 0) {
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/* report error */
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pr_info("Module registration error: %d\n", ret);
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return ret;
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}
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/* initialize devs fields */
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cdev_init(&devs.cdev, &skeleton_fops);
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ret = cdev_add(&devs.cdev, MKDEV(MY_MAJOR, 0), 1);
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if (ret != 0) {
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/* report error */
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pr_info("cdev add error: %d\n", ret);
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return ret;
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}
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return ret;
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}
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void ex2_exit(void) {
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cdev_del(&devs.cdev);
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unregister_chrdev_region(MKDEV(MY_MAJOR, 0), MY_MAX_MINORS);
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}
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@@ -1,17 +1,136 @@
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#include <linux/module.h> // needed by all modules
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#include <linux/init.h> // needed for macros
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#include <linux/kernel.h> // needed for debugging
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/kdev_t.h>
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#include <linux/cdev.h>
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#include <linux/minmax.h>
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#include <stddef.h>
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#include <linux/uaccess.h>
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#include "ex2.c"
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// linux theory: https://linux-kernel-labs.github.io/refs/heads/master/labs/device_drivers.html
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#define MY_MAJOR 42
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#define MY_MAX_MINORS 5
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#define BUFFER_SIZE 300
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struct my_device_data {
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struct cdev cdev;
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/* my data starts here */
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char buffer[BUFFER_SIZE];
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};
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struct my_device_data devs;
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// inode: https://www.kernel.org/doc/html/latest/filesystems/ext4/inodes.html
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// file: https://docs.kernel.org/filesystems/api-summary.html#c.file
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int skeleton_open(struct inode* i, struct file* f) {
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pr_info("Open file\n");
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// Get the stuct of my data
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struct my_device_data *my_data = container_of(i->i_cdev, struct my_device_data, cdev);
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// point private data on driver data, here this is a char buffer
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f->private_data = my_data;
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return 0;
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}
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int skeleton_release(struct inode* i, struct file* f) {
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pr_info("Release file\n");
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return 0;
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}
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ssize_t skeleton_read(struct file* f, char* __user buf, size_t count, loff_t* off) {
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pr_info("Read file\n");
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struct my_device_data *my_data = (struct my_device_data *) f->private_data;
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ssize_t len = min(BUFFER_SIZE - ((size_t)*off), count);
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if (len <= 0) {
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pr_info("Cannot read data for length: %ld\n", len);
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return 0;
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}
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/* read data from my_data->buffer to user buffer */
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if (copy_to_user(buf, my_data->buffer + *off, len)) {
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pr_info("Failed to copy to user space buffer\n");
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return -EFAULT;
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}
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*off += len;
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return len;
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}
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ssize_t skeleton_write(struct file* f, const char* __user buf, size_t count, loff_t* off) {
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pr_info("Write file\n");
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struct my_device_data *my_data = (struct my_device_data *) f->private_data;
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ssize_t len = min(BUFFER_SIZE - ((size_t)*off), count);
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if (len <= 0) {
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pr_info("Cannot write data for length: %ld\n", len);
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return 0;
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}
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/* read data from user buffer to my_data->buffer */
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if (copy_from_user(my_data->buffer + *off, buf, len)) {
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pr_info("Failed to copy from user space buffer\n");
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return -EFAULT;
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}
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*off += len;
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return len;
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}
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static struct file_operations skeleton_fops = {
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.owner = THIS_MODULE,
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.open = skeleton_open,
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.read = skeleton_read,
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.write = skeleton_write,
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.release = skeleton_release,
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};
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static int __init skeleton_init(void) {
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int ret = 0;
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pr_info("My module loading...\n");
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pr_info("----------------------\n");
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ret = ex2_init();
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pr_info("Load exercice 2\n");
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ret = register_chrdev_region(MKDEV(MY_MAJOR, 0), MY_MAX_MINORS, "My module");
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if (ret != 0) {
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/* report error */
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pr_info("Module registration error: %d\n", ret);
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return ret;
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}
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/* initialize devs fields */
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cdev_init(&devs.cdev, &skeleton_fops);
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ret = cdev_add(&devs.cdev, MKDEV(MY_MAJOR, 0), 1);
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if (ret != 0) {
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/* report error */
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pr_info("cdev add error: %d\n", ret);
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return ret;
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}
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pr_info("----------------------\n");
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pr_info("My module is loaded\n");
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@@ -23,7 +142,8 @@ static void __exit skeleton_exit(void) {
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pr_info("My module unloading...\n");
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pr_info("----------------------\n");
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ex2_exit();
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cdev_del(&devs.cdev);
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unregister_chrdev_region(MKDEV(MY_MAJOR, 0), MY_MAX_MINORS);
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pr_info("----------------------\n");
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pr_info("My module is unloaded\n");
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