Linux Device Drivers 3 examples

1 files changed, 30 insertions, 0 deletions

diff --git a/scullc/scullc_load b/scullc/scullc_load
new file mode 100644
index 0000000..8ca1f69
--- /dev/null
+++ b/scullc/scullc_load
@@ -0,0 +1,30 @@
+#!/bin/sh
+module="scullc"
+device="scullc"
+mode="664"
+
+# Group: since distributions do it differently, look for wheel or use staff
+if grep '^staff:' /etc/group > /dev/null; then
+    group="staff"
+else
+    group="wheel"
+fi
+
+# remove stale nodes
+rm -f /dev/${device}? 
+
+# invoke insmod with all arguments we got
+# and use a pathname, as newer modutils don't look in . by default
+/sbin/insmod -f ./$module.ko $* || exit 1
+
+major=`cat /proc/devices | awk "\\$2==\"$module\" {print \\$1}"`
+
+mknod /dev/${device}0 c $major 0
+mknod /dev/${device}1 c $major 1
+mknod /dev/${device}2 c $major 2
+mknod /dev/${device}3 c $major 3
+ln -sf ${device}0  /dev/${device}
+
+# give appropriate group/permissions
+chgrp $group /dev/${device}[0-3]
+chmod $mode  /dev/${device}[0-3]