From 7e4220219f8a4fb635f1477bd23246cc40fff531 Mon Sep 17 00:00:00 2001
From: Lauchmelder <robert.altner11@gmail.com>
Date: Tue, 7 Jun 2022 16:00:49 +0200
Subject: [PATCH] added open/release syscalls

---
 install.sh |  1 -
 src/io.c   | 17 ++++++++++++-----
 src/lcd.h  |  1 +
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/install.sh b/install.sh
index fb635c6..7c65aa9 100755
--- a/install.sh
+++ b/install.sh
@@ -8,7 +8,6 @@ device=lcd
 rm -rf /dev/$device
 
 major=$(awk "\$2 == \"$module\" { print \$1 }" /proc/devices)
-echo $major
 
 mknod /dev/$device c $major 0
 chmod 664 /dev/$device
diff --git a/src/io.c b/src/io.c
index e184417..7236c5a 100644
--- a/src/io.c
+++ b/src/io.c
@@ -1,6 +1,7 @@
 #ifndef LCD_IO_H_
 #define LCD_IO_H_
 
+#include <linux/fs.h>
 #include "lcd.h"
 
 loff_t lcd_llseek(struct file* filp, loff_t where, int whence)
@@ -10,12 +11,12 @@ loff_t lcd_llseek(struct file* filp, loff_t where, int whence)
 
 ssize_t lcd_read(struct file* filp, char __user* buf, size_t count, loff_t* off)
 {
-    return 0;
+    return count;
 }
 
-ssize_t lcd_write(struct file* filp, const char __user* buf, size_t size, loff_t* off)
+ssize_t lcd_write(struct file* filp, const char __user* buf, size_t count, loff_t* off)
 {
-    return 0;
+    return count;
 }
 
 long lcd_ioctl(struct file* filp, unsigned int cmd, unsigned long arg)
@@ -23,13 +24,19 @@ long lcd_ioctl(struct file* filp, unsigned int cmd, unsigned long arg)
     return 0;
 }
 
-int lcd_open(struct inode* inode, struct file* file)
+int lcd_open(struct inode* inode, struct file* filp)
 {
+    struct lcd_dev* dev;
+    dev = container_of(inode->i_cdev, struct lcd_dev, dev);
+    filp->private_data = (void*)dev;
+
+    printk(KERN_INFO "%s: Opened device\n", THIS_MODULE->name);
     return 0;
 }
 
-int lcd_release(struct inode* inode, struct file* file)
+int lcd_release(struct inode* inode, struct file* filp)
 {
+    printk(KERN_INFO "%s: Released device\n", THIS_MODULE->name);
     return 0;
 }
 
diff --git a/src/lcd.h b/src/lcd.h
index ca7a1bc..d5653ea 100644
--- a/src/lcd.h
+++ b/src/lcd.h
@@ -1,6 +1,7 @@
 #ifndef _LCD_H
 #define _LCD_H
 
+#include <linux/module.h>
 #include <linux/cdev.h>
 
 #define LCD_MAJOR 0