add generic gpio char dev for CONFIG_GENERIC_GPIO archs

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10261 3c298f89-4303-0410-b956-a3cf2f4a3e73

9 files changed, 668 insertions, 1 deletions

diff --git a/package/base-files/files/etc/hotplug2-common.rules b/package/base-files/files/etc/hotplug2-common.rules
index ed785e3b1..875fa12ee 100644
--- a/package/base-files/files/etc/hotplug2-common.rules
+++ b/package/base-files/files/etc/hotplug2-common.rules
@@ -1,5 +1,5 @@
 
-DEVICENAME ~~ (null|full|ptmx|tty|zero) {
+DEVICENAME ~~ (null|full|ptmx|tty|zero|gpio) {
 	nothrottle
 	makedev /dev/%DEVICENAME% 0666
 	next
diff --git a/target/linux/generic-2.6/config-2.6.23 b/target/linux/generic-2.6/config-2.6.23
index b6a2361c8..62d5ec091 100644
--- a/target/linux/generic-2.6/config-2.6.23
+++ b/target/linux/generic-2.6/config-2.6.23
@@ -1730,3 +1730,4 @@ CONFIG_ZLIB_DEFLATE=y
 CONFIG_ZLIB_INFLATE=y
 CONFIG_ZONE_DMA=y
 CONFIG_ZONE_DMA_FLAG=1
+# CONFIG_GPIO_DEVICE is not set
diff --git a/target/linux/generic-2.6/files/drivers/gpio/.built-in.o.cmd b/target/linux/generic-2.6/files/drivers/gpio/.built-in.o.cmd
new file mode 100644
index 000000000..5022c4d07
--- /dev/null
+++ b/target/linux/generic-2.6/files/drivers/gpio/.built-in.o.cmd
@@ -0,0 +1 @@
+cmd_drivers/gpio/built-in.o :=  armeb-linux-uclibc-ld -EB   -r -o drivers/gpio/built-in.o drivers/gpio/gpio_dev.o
diff --git a/target/linux/generic-2.6/files/drivers/gpio/.gpio_dev.o.cmd b/target/linux/generic-2.6/files/drivers/gpio/.gpio_dev.o.cmd
new file mode 100644
index 000000000..7e4e1ab5e
--- /dev/null
+++ b/target/linux/generic-2.6/files/drivers/gpio/.gpio_dev.o.cmd
@@ -0,0 +1,371 @@
+cmd_drivers/gpio/gpio_dev.o := armeb-linux-uclibc-gcc -Wp,-MD,drivers/gpio/.gpio_dev.o.d  -nostdinc -isystem /mnt/ixp/staging_dir/toolchain-armeb_gcc4.1.2/lib/gcc/armeb-linux-uclibc/4.1.2/include -D__KERNEL__ -Iinclude  -include include/linux/autoconf.h -mbig-endian -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Os -marm -fno-omit-frame-pointer -mapcs -mno-sched-prolog -mabi=aapcs-linux -mno-thumb-interwork -D__LINUX_ARM_ARCH__=5 -march=armv5te -mtune=xscale -Wa,-mcpu=xscale  -msoft-float -Uarm -fno-omit-frame-pointer -fno-optimize-sibling-calls  -fno-stack-protector -funit-at-a-time -Wdeclaration-after-statement -Wno-pointer-sign    -D"KBUILD_STR(s)=\#s" -D"KBUILD_BASENAME=KBUILD_STR(gpio_dev)"  -D"KBUILD_MODNAME=KBUILD_STR(gpio_dev)" -c -o drivers/gpio/gpio_dev.o drivers/gpio/gpio_dev.c
+
+deps_drivers/gpio/gpio_dev.o := \
+  drivers/gpio/gpio_dev.c \
+  include/linux/module.h \
+    $(wildcard include/config/modules.h) \
+    $(wildcard include/config/modversions.h) \
+    $(wildcard include/config/unused/symbols.h) \
+    $(wildcard include/config/generic/bug.h) \
+    $(wildcard include/config/module/unload.h) \
+    $(wildcard include/config/kallsyms.h) \
+    $(wildcard include/config/sysfs.h) \
+  include/linux/list.h \
+    $(wildcard include/config/debug/list.h) \
+  include/linux/stddef.h \
+  include/linux/compiler.h \
+    $(wildcard include/config/enable/must/check.h) \
+  include/linux/compiler-gcc4.h \
+    $(wildcard include/config/forced/inlining.h) \
+  include/linux/compiler-gcc.h \
+  include/linux/poison.h \
+  include/linux/prefetch.h \
+  include/linux/types.h \
+    $(wildcard include/config/uid16.h) \
+    $(wildcard include/config/lbd.h) \
+    $(wildcard include/config/lsf.h) \
+    $(wildcard include/config/resources/64bit.h) \
+  include/linux/posix_types.h \
+  include/asm/posix_types.h \
+  include/asm/types.h \
+  include/asm/processor.h \
+    $(wildcard include/config/mmu.h) \
+  include/asm/ptrace.h \
+    $(wildcard include/config/arm/thumb.h) \
+    $(wildcard include/config/smp.h) \
+  include/asm/hwcap.h \
+  include/asm/cache.h \
+  include/asm/system.h \
+    $(wildcard include/config/cpu/cp15.h) \
+    $(wildcard include/config/cpu/xsc3.h) \
+    $(wildcard include/config/cpu/xscale.h) \
+    $(wildcard include/config/cpu/sa1100.h) \
+    $(wildcard include/config/cpu/sa110.h) \
+  include/asm/memory.h \
+    $(wildcard include/config/dram/size.h) \
+    $(wildcard include/config/dram/base.h) \
+    $(wildcard include/config/discontigmem.h) \
+  include/asm/arch/memory.h \
+    $(wildcard include/config/pci.h) \
+  include/asm/sizes.h \
+  include/asm-generic/memory_model.h \
+    $(wildcard include/config/flatmem.h) \
+    $(wildcard include/config/sparsemem.h) \
+    $(wildcard include/config/out/of/line/pfn/to/page.h) \
+  include/linux/linkage.h \
+  include/asm/linkage.h \
+  include/linux/irqflags.h \
+    $(wildcard include/config/trace/irqflags.h) \
+    $(wildcard include/config/trace/irqflags/support.h) \
+    $(wildcard include/config/x86.h) \
+  include/asm/irqflags.h \
+  include/linux/stat.h \
+  include/asm/stat.h \
+  include/linux/time.h \
+  include/linux/cache.h \
+  include/linux/kernel.h \
+    $(wildcard include/config/preempt/voluntary.h) \
+    $(wildcard include/config/debug/spinlock/sleep.h) \
+    $(wildcard include/config/printk.h) \
+    $(wildcard include/config/numa.h) \
+  /mnt/ixp/staging_dir/toolchain-armeb_gcc4.1.2/lib/gcc/armeb-linux-uclibc/4.1.2/include/stdarg.h \
+  include/linux/bitops.h \
+  include/asm/bitops.h \
+  include/asm-generic/bitops/non-atomic.h \
+  include/asm-generic/bitops/fls64.h \
+  include/asm-generic/bitops/sched.h \
+  include/asm-generic/bitops/hweight.h \
+  include/linux/log2.h \
+    $(wildcard include/config/arch/has/ilog2/u32.h) \
+    $(wildcard include/config/arch/has/ilog2/u64.h) \
+  include/asm/byteorder.h \
+  include/linux/byteorder/big_endian.h \
+  include/linux/byteorder/swab.h \
+  include/linux/byteorder/generic.h \
+  include/asm/bug.h \
+    $(wildcard include/config/bug.h) \
+    $(wildcard include/config/debug/bugverbose.h) \
+  include/asm-generic/bug.h \
+  include/linux/seqlock.h \
+  include/linux/spinlock.h \
+    $(wildcard include/config/debug/spinlock.h) \
+    $(wildcard include/config/preempt.h) \
+    $(wildcard include/config/debug/lock/alloc.h) \
+  include/linux/preempt.h \
+    $(wildcard include/config/debug/preempt.h) \
+    $(wildcard include/config/preempt/notifiers.h) \
+  include/linux/thread_info.h \
+  include/asm/thread_info.h \
+    $(wildcard include/config/debug/stack/usage.h) \
+  include/asm/fpstate.h \
+    $(wildcard include/config/iwmmxt.h) \
+  include/asm/domain.h \
+    $(wildcard include/config/io/36.h) \
+  include/linux/stringify.h \
+  include/linux/bottom_half.h \
+  include/linux/spinlock_types.h \
+  include/linux/spinlock_types_up.h \
+  include/linux/lockdep.h \
+    $(wildcard include/config/lockdep.h) \
+    $(wildcard include/config/lock/stat.h) \
+    $(wildcard include/config/generic/hardirqs.h) \
+    $(wildcard include/config/prove/locking.h) \
+  include/linux/spinlock_up.h \
+  include/linux/spinlock_api_up.h \
+  include/asm/atomic.h \
+  include/asm-generic/atomic.h \
+  include/linux/kmod.h \
+    $(wildcard include/config/kmod.h) \
+  include/linux/errno.h \
+  include/asm/errno.h \
+  include/asm-generic/errno.h \
+  include/asm-generic/errno-base.h \
+  include/linux/elf.h \
+  include/linux/auxvec.h \
+  include/asm/auxvec.h \
+  include/linux/elf-em.h \
+  include/asm/elf.h \
+  include/asm/user.h \
+  include/asm/page.h \
+    $(wildcard include/config/cpu/copy/v3.h) \
+    $(wildcard include/config/cpu/copy/v4wt.h) \
+    $(wildcard include/config/cpu/copy/v4wb.h) \
+    $(wildcard include/config/cpu/copy/v6.h) \
+    $(wildcard include/config/aeabi.h) \
+  include/asm/glue.h \
+    $(wildcard include/config/cpu/arm610.h) \
+    $(wildcard include/config/cpu/arm710.h) \
+    $(wildcard include/config/cpu/abrt/lv4t.h) \
+    $(wildcard include/config/cpu/abrt/ev4.h) \
+    $(wildcard include/config/cpu/abrt/ev4t.h) \
+    $(wildcard include/config/cpu/abrt/ev5tj.h) \
+    $(wildcard include/config/cpu/abrt/ev5t.h) \
+    $(wildcard include/config/cpu/abrt/ev6.h) \
+    $(wildcard include/config/cpu/abrt/ev7.h) \
+  include/asm-generic/page.h \
+  include/linux/kobject.h \
+    $(wildcard include/config/hotplug.h) \
+  include/linux/sysfs.h \
+  include/linux/kref.h \
+  include/linux/wait.h \
+  include/asm/current.h \
+  include/linux/moduleparam.h \
+  include/linux/init.h \
+    $(wildcard include/config/hotplug/cpu.h) \
+    $(wildcard include/config/memory/hotplug.h) \
+    $(wildcard include/config/acpi/hotplug/memory.h) \
+  include/asm/local.h \
+  include/asm-generic/local.h \
+  include/linux/percpu.h \
+  include/linux/slab.h \
+    $(wildcard include/config/slab/debug.h) \
+    $(wildcard include/config/slub.h) \
+    $(wildcard include/config/slob.h) \
+    $(wildcard include/config/debug/slab.h) \
+  include/linux/gfp.h \
+    $(wildcard include/config/zone/dma.h) \
+    $(wildcard include/config/zone/dma32.h) \
+    $(wildcard include/config/highmem.h) \
+  include/linux/mmzone.h \
+    $(wildcard include/config/force/max/zoneorder.h) \
+    $(wildcard include/config/arch/populates/node/map.h) \
+    $(wildcard include/config/flat/node/mem/map.h) \
+    $(wildcard include/config/have/memory/present.h) \
+    $(wildcard include/config/need/node/memmap/size.h) \
+    $(wildcard include/config/need/multiple/nodes.h) \
+    $(wildcard include/config/have/arch/early/pfn/to/nid.h) \
+    $(wildcard include/config/sparsemem/extreme.h) \
+    $(wildcard include/config/nodes/span/other/nodes.h) \
+    $(wildcard include/config/holes/in/zone.h) \
+  include/linux/threads.h \
+    $(wildcard include/config/nr/cpus.h) \
+    $(wildcard include/config/base/small.h) \
+  include/linux/numa.h \
+    $(wildcard include/config/nodes/shift.h) \
+  include/linux/nodemask.h \
+  include/linux/bitmap.h \
+  include/linux/string.h \
+  include/asm/string.h \
+  include/linux/memory_hotplug.h \
+    $(wildcard include/config/have/arch/nodedata/extension.h) \
+  include/linux/notifier.h \
+  include/linux/mutex.h \
+    $(wildcard include/config/debug/mutexes.h) \
+  include/linux/rwsem.h \
+    $(wildcard include/config/rwsem/generic/spinlock.h) \
+  include/linux/rwsem-spinlock.h \
+  include/linux/srcu.h \
+  include/linux/topology.h \
+    $(wildcard include/config/sched/smt.h) \
+    $(wildcard include/config/sched/mc.h) \
+  include/linux/cpumask.h \
+  include/linux/smp.h \
+  include/asm/topology.h \
+  include/asm-generic/topology.h \
+  include/linux/slab_def.h \
+  include/linux/kmalloc_sizes.h \
+  include/asm/percpu.h \
+  include/asm-generic/percpu.h \
+  include/linux/hardirq.h \
+    $(wildcard include/config/preempt/bkl.h) \
+    $(wildcard include/config/virt/cpu/accounting.h) \
+  include/linux/smp_lock.h \
+    $(wildcard include/config/lock/kernel.h) \
+  include/asm/hardirq.h \
+  include/asm/irq.h \
+  include/asm/arch/irqs.h \
+    $(wildcard include/config/cpu/ixp46x.h) \
+    $(wildcard include/config/cpu/ixp43x.h) \
+  include/linux/irq_cpustat.h \
+  include/asm/module.h \
+  include/asm/uaccess.h \
+  include/linux/sched.h \
+    $(wildcard include/config/sched/debug.h) \
+    $(wildcard include/config/no/hz.h) \
+    $(wildcard include/config/detect/softlockup.h) \
+    $(wildcard include/config/split/ptlock/cpus.h) \
+    $(wildcard include/config/keys.h) \
+    $(wildcard include/config/bsd/process/acct.h) \
+    $(wildcard include/config/taskstats.h) \
+    $(wildcard include/config/audit.h) \
+    $(wildcard include/config/inotify/user.h) \
+    $(wildcard include/config/schedstats.h) \
+    $(wildcard include/config/task/delay/acct.h) \
+    $(wildcard include/config/fair/group/sched.h) \
+    $(wildcard include/config/blk/dev/io/trace.h) \
+    $(wildcard include/config/cc/stackprotector.h) \
+    $(wildcard include/config/sysvipc.h) \
+    $(wildcard include/config/rt/mutexes.h) \
+    $(wildcard include/config/task/xacct.h) \
+    $(wildcard include/config/cpusets.h) \
+    $(wildcard include/config/compat.h) \
+    $(wildcard include/config/fault/injection.h) \
+  include/asm/param.h \
+    $(wildcard include/config/hz.h) \
+  include/linux/capability.h \
+  include/linux/timex.h \
+  include/asm/timex.h \
+  include/asm/arch/timex.h \
+  include/asm/hardware.h \
+  include/asm/arch/hardware.h \
+  include/asm/arch/ixp4xx-regs.h \
+  include/asm/arch/cpu.h \
+  include/asm/arch/platform.h \
+  include/asm/arch/ixdp425.h \
+  include/asm/arch/avila.h \
+  include/asm/arch/coyote.h \
+  include/asm/arch/prpmc1100.h \
+  include/asm/arch/nslu2.h \
+  include/asm/arch/nas100d.h \
+  include/asm/arch/dsmg600.h \
+  include/asm/arch/fsg.h \
+  include/linux/jiffies.h \
+  include/linux/calc64.h \
+  include/asm/div64.h \
+  include/linux/rbtree.h \
+  include/asm/semaphore.h \
+  include/asm/locks.h \
+  include/asm/mmu.h \
+    $(wildcard include/config/cpu/has/asid.h) \
+  include/asm/cputime.h \
+  include/asm-generic/cputime.h \
+  include/linux/sem.h \
+  include/linux/ipc.h \
+  include/asm/ipcbuf.h \
+  include/asm/sembuf.h \
+  include/linux/signal.h \
+  include/asm/signal.h \
+  include/asm-generic/signal.h \
+  include/asm/sigcontext.h \
+  include/asm/siginfo.h \
+  include/asm-generic/siginfo.h \
+  include/linux/securebits.h \
+  include/linux/fs_struct.h \
+  include/linux/completion.h \
+  include/linux/pid.h \
+  include/linux/rcupdate.h \
+  include/linux/seccomp.h \
+    $(wildcard include/config/seccomp.h) \
+  include/linux/futex.h \
+    $(wildcard include/config/futex.h) \
+  include/linux/rtmutex.h \
+    $(wildcard include/config/debug/rt/mutexes.h) \
+  include/linux/plist.h \
+    $(wildcard include/config/debug/pi/list.h) \
+  include/linux/param.h \
+  include/linux/resource.h \
+  include/asm/resource.h \
+  include/asm-generic/resource.h \
+  include/linux/timer.h \
+    $(wildcard include/config/timer/stats.h) \
+  include/linux/ktime.h \
+    $(wildcard include/config/ktime/scalar.h) \
+  include/linux/hrtimer.h \
+    $(wildcard include/config/high/res/timers.h) \
+  include/linux/task_io_accounting.h \
+    $(wildcard include/config/task/io/accounting.h) \
+  include/linux/aio.h \
+  include/linux/workqueue.h \
+  include/linux/aio_abi.h \
+  include/linux/uio.h \
+  include/asm/io.h \
+  include/asm/arch/io.h \
+    $(wildcard include/config/ixp4xx/indirect/pci.h) \
+  include/asm/gpio.h \
+  include/asm/arch/gpio.h \
+  include/asm-generic/gpio.h \
+  include/linux/genhd.h \
+    $(wildcard include/config/block.h) \
+    $(wildcard include/config/fail/make/request.h) \
+    $(wildcard include/config/solaris/x86/partition.h) \
+    $(wildcard include/config/bsd/disklabel.h) \
+    $(wildcard include/config/unixware/disklabel.h) \
+    $(wildcard include/config/minix/subpartition.h) \
+  include/linux/major.h \
+  include/linux/device.h \
+    $(wildcard include/config/debug/devres.h) \
+  include/linux/ioport.h \
+  include/linux/klist.h \
+  include/linux/pm.h \
+    $(wildcard include/config/suspend.h) \
+    $(wildcard include/config/pm/sleep.h) \
+  include/asm/device.h \
+    $(wildcard include/config/dmabounce.h) \
+  include/linux/fs.h \
+    $(wildcard include/config/dnotify.h) \
+    $(wildcard include/config/quota.h) \
+    $(wildcard include/config/inotify.h) \
+    $(wildcard include/config/security.h) \
+    $(wildcard include/config/epoll.h) \
+    $(wildcard include/config/auditsyscall.h) \
+    $(wildcard include/config/fs/xip.h) \
+    $(wildcard include/config/migration.h) \
+  include/linux/limits.h \
+  include/linux/ioctl.h \
+  include/asm/ioctl.h \
+  include/asm-generic/ioctl.h \
+  include/linux/kdev_t.h \
+  include/linux/dcache.h \
+    $(wildcard include/config/profiling.h) \
+  include/linux/namei.h \
+  include/linux/radix-tree.h \
+  include/linux/prio_tree.h \
+  include/linux/sysctl.h \
+  include/linux/quota.h \
+  include/linux/dqblk_xfs.h \
+  include/linux/dqblk_v1.h \
+  include/linux/dqblk_v2.h \
+  include/linux/nfs_fs_i.h \
+  include/linux/nfs.h \
+  include/linux/sunrpc/msg_prot.h \
+  include/linux/fcntl.h \
+  include/asm/fcntl.h \
+  include/asm-generic/fcntl.h \
+    $(wildcard include/config/64bit.h) \
+  include/linux/err.h \
+  include/linux/platform_device.h \
+  include/linux/gpio_dev.h \
+
+drivers/gpio/gpio_dev.o: $(deps_drivers/gpio/gpio_dev.o)
+
+$(deps_drivers/gpio/gpio_dev.o):
diff --git a/target/linux/generic-2.6/files/drivers/gpio/Kconfig b/target/linux/generic-2.6/files/drivers/gpio/Kconfig
new file mode 100644
index 000000000..d97fc1b4f
--- /dev/null
+++ b/target/linux/generic-2.6/files/drivers/gpio/Kconfig
@@ -0,0 +1,15 @@
+menuconfig NEW_GPIO
+	bool "GPIO Support"
+	depends on GENERIC_GPIO
+	help
+	  Say Y to enable Linux GPIO device support.  This allows control of 
+	  GPIO pins using a character device 
+
+if NEW_GPIO
+
+config GPIO_DEVICE
+	tristate "GPIO device support"
+	help
+	  This option enables the gpio character device 
+
+endif # NEW_GPIO
diff --git a/target/linux/generic-2.6/files/drivers/gpio/Makefile b/target/linux/generic-2.6/files/drivers/gpio/Makefile
new file mode 100644
index 000000000..166c5c743
--- /dev/null
+++ b/target/linux/generic-2.6/files/drivers/gpio/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_GPIO_DEVICE)	+= gpio_dev.o
diff --git a/target/linux/generic-2.6/files/drivers/gpio/gpio_dev.c b/target/linux/generic-2.6/files/drivers/gpio/gpio_dev.c
new file mode 100644
index 000000000..2adbb96d4
--- /dev/null
+++ b/target/linux/generic-2.6/files/drivers/gpio/gpio_dev.c
@@ -0,0 +1,194 @@
+/*
+ * character device wrapper for generic gpio layer
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA02111-1307USA
+ *
+ * Feedback, Bugs...  blogic@openwrt.org
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+#include <linux/init.h>
+#include <linux/genhd.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/gpio_dev.h>
+
+#define DRVNAME		"gpiodev"
+#define DEVNAME		"gpio"
+
+static int dev_major;
+static int gpio_is_open = 0;
+unsigned int gpio_access_mask = 0;
+static struct class *gpio_class;
+
+static int
+gpio_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg)
+{
+	int retval = 0;
+
+	if ((arg & gpio_access_mask) != arg)
+	{
+		retval = -EINVAL;
+		goto out;
+	}
+
+	switch (cmd)
+	{
+	case GPIO_GET:
+		retval = gpio_get_value(arg);
+		break;
+
+	case GPIO_SET:
+		gpio_set_value(arg, 0);
+		break;
+
+	case GPIO_CLEAR:
+		gpio_set_value(arg, 0);
+		break;
+
+	case GPIO_DIR_IN:
+		gpio_direction_input(arg);
+		break;
+
+	case GPIO_DIR_OUT:
+		gpio_direction_output(arg, 0);
+		break;
+
+	default:
+		retval = -EINVAL;
+		break;
+	}
+
+out:
+	return retval;
+}
+
+static int
+gpio_open(struct inode *inode, struct file *file)
+{
+	int result = 0;
+	unsigned int dev_minor = MINOR(inode->i_rdev);
+
+	if (dev_minor != 0)
+	{
+		printk(KERN_ERR DRVNAME ": trying to access unknown minor device -> %d\n", dev_minor);
+		result = -ENODEV;
+		goto out;
+	}
+
+	if (gpio_is_open)
+	{
+		printk(KERN_ERR DRVNAME ": Device with minor ID %d already in use\n", dev_minor);
+		result = -EBUSY;
+		goto out;
+	}
+
+	gpio_is_open = 1;
+
+out:
+	return result;
+}
+
+static int
+gpio_close(struct inode * inode, struct file * file)
+{
+	gpio_is_open = 0;
+
+	return 0;
+}
+
+struct file_operations gpio_fops = {
+	ioctl:		gpio_ioctl,
+	open:		gpio_open,
+	release:	gpio_close
+};
+
+static int
+gpio_probe(struct platform_device *dev)
+{
+	int result = 0;
+
+	dev_major = register_chrdev(0, DEVNAME, &gpio_fops);
+	if (!dev_major)
+	{
+		printk(KERN_ERR DRVNAME ": Error whilst opening %s \n", DEVNAME);
+		result = -ENODEV;
+		goto out;
+	}
+
+	gpio_class = class_create(THIS_MODULE, DEVNAME);
+	class_device_create(gpio_class, NULL, MKDEV(dev_major, 0), NULL, DEVNAME);
+
+	printk(KERN_INFO DRVNAME ": gpio device registered with major %d\n", dev_major);
+
+	if (dev->num_resources != 1)
+	{
+		printk(KERN_ERR DRVNAME ": device may only have 1 resource\n");
+		result = -ENODEV;
+		goto out;
+	}
+
+	gpio_access_mask = dev->resource[0].start;
+
+	printk(KERN_INFO DRVNAME ": gpio platform device registered with access mask %08X\n", gpio_access_mask);
+out:
+	return result;
+}
+
+static int
+gpio_remove(struct platform_device *dev)
+{
+	unregister_chrdev(dev_major, DEVNAME);
+	return 0;
+}
+
+static struct
+platform_driver gpio_driver = {
+	.probe = gpio_probe,
+	.remove = gpio_remove,
+	.driver = {
+		.name = "GPIODEV",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init
+gpio_mod_init(void)
+{
+	int ret = platform_driver_register(&gpio_driver);
+	if (ret)
+		printk(KERN_INFO DRVNAME ": Error registering platfom driver!");
+
+	return ret;
+}
+
+static void __exit
+gpio_mod_exit(void)
+{
+	platform_driver_unregister(&gpio_driver);
+}
+
+module_init (gpio_mod_init);
+module_exit (gpio_mod_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("John Crispin / OpenWrt");
+MODULE_DESCRIPTION("Character device for for generic gpio api");
diff --git a/target/linux/generic-2.6/patches-2.6.23/920-gpio_dev.patch b/target/linux/generic-2.6/patches-2.6.23/920-gpio_dev.patch
new file mode 100644
index 000000000..81c206b65
--- /dev/null
+++ b/target/linux/generic-2.6/patches-2.6.23/920-gpio_dev.patch
@@ -0,0 +1,35 @@
+Index: linux-2.6.23.14/arch/arm/Kconfig
+===================================================================
+--- linux-2.6.23.14.orig/arch/arm/Kconfig	2008-01-26 02:46:18.000000000 +0100
++++ linux-2.6.23.14/arch/arm/Kconfig	2008-01-26 02:46:33.000000000 +0100
+@@ -1039,6 +1039,8 @@
+ 
+ source "drivers/leds/Kconfig"
+ 
++source "drivers/gpio/Kconfig"
++
+ source "drivers/media/Kconfig"
+ 
+ source "drivers/video/Kconfig"
+Index: linux-2.6.23.14/drivers/Kconfig
+===================================================================
+--- linux-2.6.23.14.orig/drivers/Kconfig	2008-01-26 02:45:44.000000000 +0100
++++ linux-2.6.23.14/drivers/Kconfig	2008-01-26 02:46:05.000000000 +0100
+@@ -74,6 +74,8 @@
+ 
+ source "drivers/leds/Kconfig"
+ 
++source "drivers/gpio/Kconfig"
++
+ source "drivers/infiniband/Kconfig"
+ 
+ source "drivers/edac/Kconfig"
+Index: linux-2.6.23.14/drivers/Makefile
+===================================================================
+--- linux-2.6.23.14.orig/drivers/Makefile	2008-01-26 02:44:13.000000000 +0100
++++ linux-2.6.23.14/drivers/Makefile	2008-01-26 02:44:42.000000000 +0100
+@@ -88,3 +88,4 @@
+ obj-$(CONFIG_HID)		+= hid/
+ obj-$(CONFIG_PPC_PS3)		+= ps3/
+ obj-$(CONFIG_OF)		+= of/
++obj-$(CONFIG_GPIO_DEVICE)	+= gpio/
diff --git a/target/linux/ixp4xx/patches-2.6.23/302-gpio_device.patch b/target/linux/ixp4xx/patches-2.6.23/302-gpio_device.patch
new file mode 100644
index 000000000..0a1831b4f
--- /dev/null
+++ b/target/linux/ixp4xx/patches-2.6.23/302-gpio_device.patch
@@ -0,0 +1,49 @@
+Index: linux-2.6.23.14/arch/arm/mach-ixp4xx/avila-setup.c
+===================================================================
+--- linux-2.6.23.14.orig/arch/arm/mach-ixp4xx/avila-setup.c	2008-01-26 02:59:30.000000000 +0100
++++ linux-2.6.23.14/arch/arm/mach-ixp4xx/avila-setup.c	2008-01-26 03:03:07.000000000 +0100
+@@ -183,6 +183,23 @@
+ };
+ #endif
+ 
++#ifdef CONFIG_GPIO_DEVICE
++static struct resource avila_gpio_resources[] = {
++	{
++		.name	= "gpio",
++		.start	= AVILA_GPIO_MASK,
++		.end	= AVILA_GPIO_MASK,
++		.flags	= 0,
++	},
++};
++
++static struct platform_device avila_gpio = {
++	.name				= "GPIODEV",
++	.id					= -1,
++	.num_resources		= ARRAY_SIZE(avila_gpio_resources),
++	.resource			= avila_gpio_resources,
++};
++#endif
+ 
+ static struct platform_device *avila_devices[] __initdata = {
+ 	&avila_i2c_gpio,
+@@ -193,6 +210,9 @@
+ #ifdef CONFIG_LEDS_IXP4XX
+ 	&avila_leds,
+ #endif
++#ifdef CONFIG_GPIO_DEVICE
++	&avila_gpio,
++#endif
+ };
+ 
+ static char avila_rtc_probe[] __initdata = "rtc-ds1672.probe=0,0x68 ";
+Index: linux-2.6.23.14/include/asm-arm/arch-ixp4xx/avila.h
+===================================================================
+--- linux-2.6.23.14.orig/include/asm-arm/arch-ixp4xx/avila.h	2008-01-26 03:03:27.000000000 +0100
++++ linux-2.6.23.14/include/asm-arm/arch-ixp4xx/avila.h	2008-01-26 03:07:02.000000000 +0100
+@@ -38,3 +38,6 @@
+ 
+ /* User LED */
+ #define AVILA_LED_USER_GPIO	3
++
++/* gpio mask used by platform device */
++#define AVILA_GPIO_MASK		(1 << 1) | (1 << 3) | (1 << 5) | (1 << 7) | (1 << 9)