Added some debugging functions.

diff --git a/sllin/sllin.c b/sllin/sllin.c
index bf331d76d92254bd59a3c56b1278f9f7b7f0bb30..ce8709fa61f71063ca1c980638dc3ab11d00476a 100644 (file)
--- a/sllin/sllin.c
+++ b/sllin/sllin.c
@@ -61,7 +61,6 @@
 /* Should be in include/linux/tty.h */
 #define N_SLLIN         25
 
-
 static __initdata const char banner[] =
        KERN_INFO "sllin: serial line LIN interface driver\n";
 
@@ -226,12 +225,15 @@ static void sll_encaps(struct sllin *sl, struct can_frame *cf)
        char lframe[16] = {0x00, 0x55}; /* Fake break, Sync byte */
        struct tty_struct *tty = sl->tty;
 
+       pr_debug("sllin: %s() invoked\n", __FUNCTION__);
+
        /* We do care only about SFF frames */
        if (cf->can_id & CAN_EFF_FLAG)
                return;
 
        /* Send only header */
        if (cf->can_id & CAN_RTR_FLAG) {
+               pr_debug("sllin: RTR CAN frame\n", __FUNCTION__);
                lframe[2] = (u8)cf->can_id; /* Get one byte LIN ID */
 
                sltty_change_speed(tty, 1200);
@@ -240,6 +242,7 @@ static void sll_encaps(struct sllin *sl, struct can_frame *cf)
                tty->ops->write(tty, &lframe[1], 1);
                tty->ops->write(tty, &lframe[2], 1);
        } else {
+               pr_debug("sllin: non-RTR CAN frame\n", __FUNCTION__);
                /*      idx = strlen(sl->xbuff);
 
                        for (i = 0; i < cf->can_dlc; i++)
@@ -346,6 +349,8 @@ static int sll_open(struct net_device *dev)
 {
        struct sllin *sl = netdev_priv(dev);
 
+       pr_debug("sllin: %s() invoked\n", __FUNCTION__);
+
        if (sl->tty == NULL)
                return -ENODEV;
 
@@ -507,6 +512,7 @@ static int sllin_open(struct tty_struct *tty)
 {
        struct sllin *sl;
        int err;
+       pr_debug("sllin: %s() invoked\n", __FUNCTION__);
 
        if (!capable(CAP_NET_ADMIN))
                return -EPERM;