added open/release syscalls

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

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;
 }
 

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