gpio: Add support for Intel ICHx/3100/Series[56] GPIO

This driver works on many Intel chipsets, including the ICH6, ICH7,
ICH8, ICH9, ICH10, 3100, Series 5/3400 (Ibex Peak), Series 6/C200
(Cougar Point), and NM10 (Tiger Point).

Additional Intel chipsets should be easily supported if needed, eg the
ICH1-5, EP80579, etc.

Tested on QM67 (Cougar Point), QM57 (Ibex Peak), 3100 (Whitmore Lake),
and NM10 (Tiger Point).

Includes work from Jean Delvare:
        - Resource leak removal during module load/unload
        - GPIO API bit value enforcement

Also includes code cleanup from Guenter Roeck and Grant Likely.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

MAINTAINERS

@@ -3340,6 +3340,12 @@ W:	http://www.developer.ibm.com/welcome/netfinity/serveraid.html
 S:	Supported
 F:	drivers/scsi/ips.*
 
+ICH LPC AND GPIO DRIVER
+M:	Peter Tyser <ptyser@xes-inc.com>
+S:	Maintained
+F:	drivers/mfd/lpc_ich.c
+F:	drivers/gpio/gpio-ich.c
+
 IDE SUBSYSTEM
 M:	"David S. Miller" <davem@davemloft.net>
 L:	linux-ide@vger.kernel.org

drivers/gpio/Kconfig

@@ -178,6 +178,19 @@ config GPIO_SCH
 	  The Intel Tunnel Creek processor has 5 GPIOs powered by the
 	  core power rail and 9 from suspend power supply.
 
+config GPIO_ICH
+	tristate "Intel ICH GPIO"
+	depends on PCI && X86
+	select MFD_CORE
+	select LPC_ICH
+	help
+	  Say yes here to support the GPIO functionality of a number of Intel
+	  ICH-based chipsets.  Currently supported devices: ICH6, ICH7, ICH8
+	  ICH9, ICH10, Series 5/3400 (eg Ibex Peak), Series 6/C200 (eg
+	  Cougar Point), NM10 (Tiger Point), and 3100 (Whitmore Lake).
+
+	  If unsure, say N.
+
 config GPIO_VX855
 	tristate "VIA VX855/VX875 GPIO"
 	depends on PCI

drivers/gpio/Makefile

@@ -17,6 +17,7 @@ obj-$(CONFIG_GPIO_DA9052)	+= gpio-da9052.o
 obj-$(CONFIG_ARCH_DAVINCI)	+= gpio-davinci.o
 obj-$(CONFIG_GPIO_EP93XX)	+= gpio-ep93xx.o
 obj-$(CONFIG_GPIO_GE_FPGA)	+= gpio-ge.o
+obj-$(CONFIG_GPIO_ICH)		+= gpio-ich.o
 obj-$(CONFIG_GPIO_IT8761E)	+= gpio-it8761e.o
 obj-$(CONFIG_GPIO_JANZ_TTL)	+= gpio-janz-ttl.o
 obj-$(CONFIG_ARCH_KS8695)	+= gpio-ks8695.o