From: Luis R. Rodriguez <mcgrof@do-not-panic.com>
Date: Tue, 4 Dec 2012 21:07:11 +0000 (+0000)
Subject: compat-drivers: add the MDIO module
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=966eaf82824f442bf4e0fea0639613a13e680df4;p=openwrt%2Fstaging%2Fblogic.git

compat-drivers: add the MDIO module

The alx Ethernet driver depends on the MDIO module.
This module has UAPI and kernel headers. The headers are
carried over intact to help *both* backport it for older
drivers and also provide the newer driver to other kernels
that may have it enabled after it was introduced in 2.6.31.

The way support for MDIO is enabled is by carrying over both
the UAPI and Linux kernel header files along with the module
with in compat-drivers. The exported symbols of the module
however are renamed with a compat_* prefix within compat
in include/linux/compat-2.6.31.h. This enables Linux
distributions shipping a driver that depends on older
versions of the MDIO to keep using it while allowing the
supplied drivers in compat-drivers to become users of
the newer module it likely will require a tighter
dependency on.

An alternative to using different exported symbol names
is for compat-drivers to work under a separate namespace
and while I hear some folks already implemented that support
we never got those patches sent to us.

C'est la vie.

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
---

diff --git a/config.mk b/config.mk
index 2aefc40c040e..fa2ce67992ef 100644
--- a/config.mk
+++ b/config.mk
@@ -413,6 +413,9 @@ export CONFIG_ATL1E=m
 ifndef CONFIG_COMPAT_KERNEL_2_6_28
 export CONFIG_ATL1C=m
 export CONFIG_ALX=m
+# If MDIO is needed for another driver feel free to
+# make it not depend on 2.6.28
+export CONFIG_COMPAT_MDIO=m
 endif #CONFIG_COMPAT_KERNEL_2_6_28
 
 ifdef CONFIG_WIRELESS_EXT
diff --git a/scripts/admin-update.sh b/scripts/admin-update.sh
index b2586c188ab5..627a0264c3d8 100755
--- a/scripts/admin-update.sh
+++ b/scripts/admin-update.sh
@@ -384,6 +384,9 @@ DRIVERS_ETH="drivers/net/ethernet/atheros
 	     drivers/net/ethernet/atheros/atl1e
 	     drivers/net/ethernet/atheros/atlx"
 
+# Ethernet drivers that have their own file alone
+DRIVERS_ETH_FILES="mdio.c"
+
 # Bluetooth drivers
 DRIVERS_BT="drivers/bluetooth"
 
@@ -612,11 +615,18 @@ if [[ "$ENABLE_NETWORK" == "1" ]]; then
 	copyFiles "$DRIVERS_WLAN_FILES"			"drivers/net/wireless"
 	copyFiles "$RNDIS_REQUIREMENTS"			"drivers/net/usb"
 
+	# Ethernet
+	copyFiles "$DRIVERS_ETH_FILES"			"drivers/net/"
+	echo "compat_mdio-y                      += mdio.o" > drivers/net/Makefile
+	echo "obj-\$(CONFIG_COMPAT_MDIO)          += compat_mdio.o" >> drivers/net/Makefile
+	copyDirectories "$DRIVERS_ETH"
+	cp $GIT_TREE/include/linux/mdio.h include/linux/
+	cp $GIT_TREE/include/uapi/linux/mdio.h include/uapi/linux/
+
 	copyDirectories "$NET_WLAN_DIRS"
 	copyDirectories "$NET_BT_DIRS"
 	copyDirectories "$DRIVERS_BT"
 	copyDirectories "$DRIVERS_WLAN"
-	copyDirectories "$DRIVERS_ETH"
 
 	cp -a $GIT_TREE/include/linux/ssb include/linux/
 	cp -a $GIT_TREE/include/linux/bcma include/linux/