diff --git a/20160425/Makefile b/20160425/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..263a0a5effc01e8110f1626a3d9540e646715deb
--- /dev/null
+++ b/20160425/Makefile
@@ -0,0 +1,8 @@
+obj-m += hellomod-1.o
+obj-m += chardev-1.o
+
+all:
+ make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+
+clean:
+ make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
diff --git a/20160425/chardev-1.c b/20160425/chardev-1.c
new file mode 100644
index 0000000000000000000000000000000000000000..17a6651a33313322de202fbcb6bbf82333c0b766
--- /dev/null
+++ b/20160425/chardev-1.c
@@ -0,0 +1,166 @@
+/*
+ * chardev.c: Creates a read-only char device that says how many times
+ * you've read from the dev file
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <asm/uaccess.h> /* for put_user */
+
+/*
+ * Prototypes - this would normally go in a .h file
+ */
+int init_module(void);
+void cleanup_module(void);
+static int device_open(struct inode *, struct file *);
+static int device_release(struct inode *, struct file *);
+static ssize_t device_read(struct file *, char *, size_t, loff_t *);
+static ssize_t device_write(struct file *, const char *, size_t, loff_t *);
+
+#define SUCCESS 0
+#define DEVICE_NAME "chardev" /* Dev name as it appears in /proc/devices */
+#define BUF_LEN 80 /* Max length of the message from the device */
+
+/*
+ * Global variables are declared as static, so are global within the file.
+ */
+
+static int Major; /* Major number assigned to our device driver */
+static int Device_Open = 0; /* Is device open?
+ * Used to prevent multiple access to device */
+static char msg[BUF_LEN]; /* The msg the device will give when asked */
+static char *msg_Ptr;
+
+static struct file_operations fops = {
+ .read = device_read,
+ .write = device_write,
+ .open = device_open,
+ .release = device_release
+};
+
+/*
+ * This function is called when the module is loaded
+ */
+int init_module(void)
+{
+ Major = register_chrdev(0, DEVICE_NAME, &fops);
+
+ if (Major < 0) {
+ printk(KERN_ALERT "Registering char device failed with %d\n", Major);
+ return Major;
+ }
+
+ printk(KERN_INFO "I was assigned major number %d. To talk to\n", Major);
+ printk(KERN_INFO "the driver, create a dev file with\n");
+ printk(KERN_INFO "'mknod /dev/%s c %d 0'.\n", DEVICE_NAME, Major);
+ printk(KERN_INFO "Try various minor numbers. Try to cat and echo to\n");
+ printk(KERN_INFO "the device file.\n");
+ printk(KERN_INFO "Remove the device file and module when done.\n");
+
+ return SUCCESS;
+}
+
+/*
+ * This function is called when the module is unloaded
+ */
+void cleanup_module(void)
+{
+ /*
+ * Unregister the device
+ */
+ unregister_chrdev(Major, DEVICE_NAME);
+}
+
+/*
+ * Methods
+ */
+
+/*
+ * Called when a process tries to open the device file, like
+ * "cat /dev/mycharfile"
+ */
+static int device_open(struct inode *inode, struct file *file)
+{
+ static int counter = 0;
+
+ if (Device_Open)
+ return -EBUSY;
+
+ Device_Open++;
+ sprintf(msg, "I already told you %d times Hello world!\n", counter++);
+ msg_Ptr = msg;
+ try_module_get(THIS_MODULE);
+
+ return SUCCESS;
+}
+
+/*
+ * Called when a process closes the device file.
+ */
+static int device_release(struct inode *inode, struct file *file)
+{
+ Device_Open--; /* We're now ready for our next caller */
+
+ /*
+ * Decrement the usage count, or else once you opened the file, you'll
+ * never get get rid of the module.
+ */
+ module_put(THIS_MODULE);
+
+ return 0;
+}
+
+/*
+ * Called when a process, which already opened the dev file, attempts to
+ * read from it.
+ */
+static ssize_t device_read(struct file *filp, /* see include/linux/fs.h */
+ char *buffer, /* buffer to fill with data */
+ size_t length, /* length of the buffer */
+ loff_t * offset)
+{
+ /*
+ * Number of bytes actually written to the buffer
+ */
+ int bytes_read = 0;
+
+ /*
+ * If we're at the end of the message,
+ * return 0 signifying end of file
+ */
+ if (*msg_Ptr == 0)
+ return 0;
+
+ /*
+ * Actually put the data into the buffer
+ */
+ while (length && *msg_Ptr) {
+
+ /*
+ * The buffer is in the user data segment, not the kernel
+ * segment so "*" assignment won't work. We have to use
+ * put_user which copies data from the kernel data segment to
+ * the user data segment.
+ */
+ put_user(*(msg_Ptr++), buffer++);
+
+ length--;
+ bytes_read++;
+ }
+
+ /*
+ * Most read functions return the number of bytes put into the buffer
+ */
+ return bytes_read;
+}
+
+/*
+ * Called when a process writes to dev file: echo "hi" > /dev/hello
+ */
+static ssize_t
+device_write(struct file *filp, const char *buff, size_t len, loff_t * off)
+{
+ printk(KERN_ALERT "Sorry, this operation isn't supported.\n");
+ return -EINVAL;
+}
diff --git a/20160425/hellomod-1.c b/20160425/hellomod-1.c
new file mode 100644
index 0000000000000000000000000000000000000000..a9fef793369a4e24da98b91e1bb7c651190ceea2
--- /dev/null
+++ b/20160425/hellomod-1.c
@@ -0,0 +1,20 @@
+/*
+ * hello-1.c - The simplest kernel module.
+ */
+#include <linux/module.h> /* Needed by all modules */
+#include <linux/kernel.h> /* Needed for KERN_INFO */
+
+int init_module(void)
+{
+ printk(KERN_INFO "Hello world 1.\n");
+
+ /*
+ * A non 0 return means init_module failed; module can't be loaded.
+ */
+ return 0;
+}
+
+void cleanup_module(void)
+{
+ printk(KERN_INFO "Goodbye world 1.\n");
+}