--- ./KernelDrivers/eq3_char_loop.c.orig	2017-05-14 22:57:19.109181928 +0200
+++ ./KernelDrivers/eq3_char_loop.c	2020-06-04 14:36:10.188174788 +0200
@@ -48,8 +48,8 @@
 /* Use 'L' as magic number */
 #define EQ3LOOP_IOC_MAGIC  'L'
 
-#define EQ3LOOP_IOCSCREATESLAVE _IOW(EQ3LOOP_IOC_MAGIC,  1, unsigned long)
-#define EQ3LOOP_IOCGEVENTS _IOR(EQ3LOOP_IOC_MAGIC,  2, unsigned long)
+#define EQ3LOOP_IOCSCREATESLAVE _IOW(EQ3LOOP_IOC_MAGIC,  1, uint32_t)
+#define EQ3LOOP_IOCGEVENTS _IOR(EQ3LOOP_IOC_MAGIC,  2, uint32_t)
 
 #define EVENT_BIT_SLAVE_OPENED 0
 #define EVENT_BIT_SLAVE_CLOSED 1
@@ -62,6 +62,12 @@
 
 #define DUMP_READWRITE 0
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,0,0))
+  #define _access_ok(__type, __addr, __size) access_ok(__addr, __size)
+#else
+  #define _access_ok(__type, __addr, __size) access_ok(__type, __addr, __size)
+#endif
+
 struct eq3loop_channel_data
 {
 	struct circ_buf master2slave_buf;
@@ -353,7 +359,7 @@
 	{
 		ret=-EFAULT;
 		count_to_end = CIRC_SPACE( head, channel->master2slave_buf.tail, BUFSIZE);
-		printk( KERN_ERR EQ3LOOP_DRIVER_NAME ": eq3loop_write_master() %s: not enought space in the buffers. free space = %i, required space = %i", channel->name,count_to_end,count );
+		printk( KERN_ERR EQ3LOOP_DRIVER_NAME ": eq3loop_write_master() %s: not enough space in buffers. free space = %zu, required space = %zu", channel->name,count_to_end,count );
 		goto out;
 	}
 	/* ok, space is free, write something */
@@ -389,7 +395,7 @@
 	up (&channel->sem);
 	if(ret < 0)
 	{
-		printk( KERN_INFO EQ3LOOP_DRIVER_NAME ": eq3loop_write_master() retrun error:");
+		printk( KERN_INFO EQ3LOOP_DRIVER_NAME ": eq3loop_write_master() return error: %d", ret);
 	}
 	if( ret > 0 || CIRC_CNT(channel->master2slave_buf.head,channel->master2slave_buf.tail,BUFSIZE) )
 	{
@@ -456,9 +462,9 @@
 	* "write" is reversed
 	*/
 	if (_IOC_DIR(cmd) & _IOC_READ)
-	ret = !access_ok(VERIFY_WRITE, (void *)arg, _IOC_SIZE(cmd));
+	  ret = !_access_ok(VERIFY_WRITE, (void *)arg, _IOC_SIZE(cmd));
 	else if (_IOC_DIR(cmd) & _IOC_WRITE)
-	ret =  !access_ok(VERIFY_READ, (void *)arg, _IOC_SIZE(cmd));
+	  ret =  !_access_ok(VERIFY_READ, (void *)arg, _IOC_SIZE(cmd));
 	if (ret) return -EFAULT;
 
 	switch(cmd) {
@@ -500,7 +506,7 @@
 	switch(cmd) {
 
 	case TCGETS:
-		if( access_ok(VERIFY_READ, (void *)arg, sizeof(struct termios) ) )
+		if( _access_ok(VERIFY_READ, (void *)arg, sizeof(struct termios) ) )
 		{
 			ret = copy_to_user( (void*)arg, &channel->termios, sizeof(struct termios) );
 		} else {
@@ -508,7 +514,7 @@
 		}
 		break;
 	case TCSETS:
-		if( access_ok(VERIFY_WRITE, (void *)arg, sizeof(struct termios) ) )
+		if( _access_ok(VERIFY_WRITE, (void *)arg, sizeof(struct termios) ) )
 		{
 			ret = copy_from_user( &channel->termios, (void*)arg, sizeof(struct termios) );
 		} else {
@@ -533,6 +539,12 @@
 		break;
 	case TIOCMSET:
 		break;
+	case TIOCSERGETLSR:
+		ret = -ENOIOCTLCMD;
+		break;
+	case TIOCGICOUNT:
+		ret = -ENOIOCTLCMD;
+		break;
 	default:
 		ret = -ENOTTY;
 		break;
@@ -541,6 +553,7 @@
 	if( ret == -ENOTTY )
 	{
 		printk( KERN_NOTICE EQ3LOOP_DRIVER_NAME ": eq3loop_ioctl_slave() %s: unhandled ioctl 0x%04X\n", channel->name, cmd );
+		ret = -ENOIOCTLCMD;
 	}
 	return ret;
 }
@@ -908,6 +921,7 @@
 	.ioctl      = eq3loop_ioctl,
 #else
 	.unlocked_ioctl = eq3loop_ioctl,
+	.compat_ioctl = eq3loop_ioctl,
 #endif
 };
 
@@ -979,4 +993,4 @@
 module_exit(eq3loop_exit);
 MODULE_DESCRIPTION("eQ-3 IPC loopback char driver");
 MODULE_LICENSE("GPL");
-
+MODULE_VERSION("1.1");