Make the driver transmit data to linux

Makefile

@@ -1,5 +1,5 @@
-KPATH := /usr/src/linux-headers-`uname -r`
-#KPATH := /home/ubuntu/linux-5.19
+#KPATH := /usr/src/linux-headers-`uname -r`
+KPATH := /home/ubuntu/linux-5.19
 
 obj-m := ./src/hello.o
 

boom

@@ -1,6 +1,8 @@
 sudo modprobe appletalk
 sudo insmod src/hello.ko
 #sudo slattach -s 115200 -p cslip /dev/ttyUSB0
-sudo ./discipline
+#sudo ./discipline
+
+sudo ldattach -d -s 1000000 PPP /dev/ttyUSB0
 
 #echo 'file hello.c line 327  +p' > /sys/kernel/debug/dynamic_debug/control

discipline.c

@@ -330,8 +330,8 @@ int tty_open(char *name, const char *speed)
 
 
 
-    if ((fd = open("/dev/ttyS0", O_RDWR|O_NDELAY)) < 0) {
-        printf("oops");
+    if ((fd = open("/dev/ttyUSB0", O_RDWR|O_NDELAY)) < 0) {
+        perror("oops");
         return(-errno);
     }
     tty_fd = fd;
@@ -398,7 +398,7 @@ main()
 
 
 
-  if (tty_open("/dev/ttyS0", "115200") < 0)  { return(3); }
+  if (tty_open("/dev/ttyUSB0", "115200") < 0)  { return(3); }
 
 
     int disc = N_PPP;
@@ -417,7 +417,7 @@ main()
     if (tty_get_name(buff)) { return(3); }
 	printf(("%s started"), proto);
 
-	if (path_dev != NULL) printf((" on /dev/ttyS0"));
+	if (path_dev != NULL) printf((" on /dev/ttyUSB0"));
 	printf((" interface %s\n"), buff);
 
 

src/hello.c

@@ -346,11 +346,12 @@ static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
 	}
 
 	skb_put_data(skb, cp, count);
+	skb->dev = dev;
     skb->protocol = htons(ETH_P_LOCALTALK);
 
-	skb_reset_mac_header(skb);    /* Point to entire packet. */
-    skb_pull(skb,3);
-    skb_reset_transport_header(skb);    /* Point to data (Skip header). */
+	//skb_reset_mac_header(skb);    /* Point to entire packet. */
+    //skb_pull(skb,3);
+    //skb_reset_transport_header(skb);    /* Point to data (Skip header). */
 
 	netif_rx(skb);
 	dev->stats.rx_packets++;