(3/6) bcm57xx: preinit

This patch allows the bcm57xx module to work correctly with failsafe mode.

insmod doesn't return an error when a module loads but doesn't detect a switch.
I added the check_module function to load the module, then make sure
it doesn't just exit immediately.  This allows preinit to only attempt to
load the bcm57xx module when switch-robo and switch-adm dont detect a switch.

The activate_gpio parameter to bcm57xx simply instructs the module to attempt
to activate the switch via gpio before probing for the switch.

Tested on wrt350n.

Signed-off-by: Ben Pfountz <netprince (at) vt (dot) edu>

SVN-Revision: 11468

target/linux/brcm-2.4/base-files/etc/preinit.arch

@@ -4,7 +4,7 @@ failsafe() {
 	lock /tmp/.failsafe
 	failsafe_ip
 
-	echo "0 1 2 3 4 5u*" > /proc/switch/eth0/vlan/0/ports
+	echo "0 1 2 3 4 ${cpu_port:-5u*}" > /proc/switch/eth0/vlan/0/ports
 	
 	set_state failsafe
 	[ -x "/usr/sbin/nvram" ] && {
@@ -39,8 +39,19 @@ esac
 
 failsafe_ip
 
+check_module () {
+  module="$1"; shift; params="$*"
+
+  insmod "$module" "$params"
+  sleep 1
+  grep "^$module" /proc/modules
+  return $?
+}
+
 insmod switch-core
-insmod switch-robo || insmod switch-adm || rmmod switch-core
+check_module switch-robo || check_module switch-adm  || { 
+  check_module bcm57xx activate_gpio=0x4 && cpu_port="8u*"
+} || rmmod switch-core
 
 [ -d /proc/switch/eth0 ] && {
 	echo 1 > /proc/switch/eth0/reset
@@ -48,7 +59,7 @@ insmod switch-robo || insmod switch-adm || rmmod switch-core
 	# this would be easier if we blasted the message across all ports
 	# but we don't want packets leaking across interfaces
 	for port in $(seq 0 4); do {
-		echo "$port 5u*" > /proc/switch/eth0/vlan/0/ports
+		echo "$port ${cpu_port:-5u*}" > /proc/switch/eth0/vlan/0/ports
 		netmsg 192.168.1.255 "Press reset now, to enter Failsafe!"
 	}; done
 } || netmsg 192.168.1.255 "Press reset now, to enter Failsafe!"