Linux Device Drivers 3 examples

1 files changed, 47 insertions, 0 deletions

diff --git a/sbull/sbull_load b/sbull/sbull_load
new file mode 100644
index 0000000..8cdec56
--- /dev/null
+++ b/sbull/sbull_load
@@ -0,0 +1,47 @@
+#!/bin/sh
+
+function make_minors {
+    let part=1
+    while (($part < $minors)); do
+	let minor=$part+$2
+	mknod $1$part b $major $minor
+	let part=$part+1
+    done
+}
+
+
+# FIXME: This isn't handling minors (partitions) at all.
+module="sbull"
+device="sbull"
+mode="664"
+chardevice="sbullr"
+minors=16
+
+# 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
+
+# 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}"`
+
+# Remove stale nodes and replace them, then give gid and perms
+
+rm -f /dev/${device}[a-d]* /dev/${device}
+
+mknod /dev/${device}a b $major 0
+make_minors /dev/${device}a 0
+mknod /dev/${device}b b $major 16
+make_minors /dev/${device}b 16
+mknod /dev/${device}c b $major 32
+make_minors /dev/${device}c 32
+mknod /dev/${device}d b $major 48
+make_minors /dev/${device}d 48
+ln -sf ${device}a /dev/${device}
+chgrp $group /dev/${device}[a-d]*
+chmod $mode  /dev/${device}[a-d]*