add support for more i2c muxes

This patch should bring support for several kernel modules related to
I2C to openwrt, which are existing for several years now. Namely there
is the i2c-tiny-usb bus driver, to hook up an I2C bus on any device with
usb support (prevent voiding warranty when opening and soldering).
Second, there is support for the i2c-mux driver and pca954x as a I2C
switch driver.
Finally there is support for common I2C gpio expander driver modules
pca953x and pcf857x. They work without providing platform data recently
(can be instantiated at runtime).

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>

SVN-Revision: 28334

package/kernel/modules/i2c.mk

@@ -213,4 +213,96 @@ define KernelPackage/octeon-i2c/description
   Kernel module to use the I2C master driver on Cavium Octeon
 endef
 
+
+I2C_TINY_USB_MODULES:= \
+  CONFIG_I2C_TINY_USB:drivers/i2c/busses/i2c-tiny-usb
+
+define KernelPackage/i2c-tiny-usb
+  $(call i2c_defaults,$(I2C_TINY_USB_MODULES),59)
+  TITLE:=I2C Tiny USB adaptor
+  DEPENDS:=@USB_SUPPORT kmod-i2c-core
+endef
+
+define KernelPackage/i2c-tiny-usb/description
+ Kernel module for the I2C Tiny USB adaptor developed
+ by Till Harbaum (http://www.harbaum.org/till/i2c_tiny_usb).
+endef
+
+$(eval $(call KernelPackage,i2c-tiny-usb))
+
+I2C_MUX_MODULES:= \
+  CONFIG_I2C_MUX:drivers/i2c/i2c-mux
+
+define KernelPackage/i2c-mux
+  $(call i2c_defaults,$(I2C_MUX_MODULES),51)
+  TITLE:=I2C bus multiplexing support
+  DEPENDS:=kmod-i2c-core
+endef
+
+define KernelPackage/i2c-mux/description
+ Kernel modules for I2C bus multiplexing support.
+endef
+
+$(eval $(call KernelPackage,i2c-mux))
+
+I2C_MUX_PCA954x_MODULES:= \
+  CONFIG_I2C_MUX_PCA954x:drivers/i2c/muxes/pca954x
+
+define KernelPackage/i2c-mux-pca954x
+  $(call i2c_defaults,$(I2C_MUX_PCA954x_MODULES),51)
+  TITLE:=Philips PCA954x I2C mux/switches
+  DEPENDS:=kmod-i2c-mux
+endef
+
+define KernelPackage/i2c-mux-pca954x/description
+ Kernel modules for PCA954x I2C bus mux/switching devices.
+endef
+
+$(eval $(call KernelPackage,i2c-mux-pca954x))
+## Support for pca954x seems to be in kernel since 2.6.36
+
+I2C_MUX_PCA9541_MODULES:= \
+  CONFIG_I2C_MUX_PCA9541:drivers/i2c/muxes/pca9541
+
+define KernelPackage/i2c-mux-pca9541
+  $(call i2c_defaults,$(I2C_MUX_PCA9541_MODULES),51)
+  TITLE:=Philips PCA9541 I2C mux/switches
+  DEPENDS:=kmod-i2c-mux
+endef
+
+define KernelPackage/i2c-mux-pca9541/description
+ Kernel modules for PCA9541 I2C bus mux/switching devices.
+endef
+
+$(eval $(call KernelPackage,i2c-mux-pca9541))
+
+GPIO_PCA953X_MODULES:= \
+  CONFIG_GPIO_PCA953X:drivers/gpio/pca953x
+
+define KernelPackage/pca953x
+  $(call i2c_defaults,$(GPIO_PCA953X_MODULES),51)
+  TITLE:=Philips PCA953x I2C GPIO extenders
+  DEPENDS:=kmod-i2c-core
+endef
+
+define KernelPackage/pca953x/description
+ Kernel modules for PCA953x I2C GPIO extenders.
+endef
+
+$(eval $(call KernelPackage,pca953x))
+
+GPIO_PCF857X_MODULES:= \
+  CONFIG_GPIO_PCF857X:drivers/gpio/pcf857x
+
+define KernelPackage/pcf857x
+  $(call i2c_defaults,$(GPIO_PCF857X_MODULES),51)
+  TITLE:=Philips PCF857x I2C GPIO extenders
+  DEPENDS:=kmod-i2c-core
+endef
+
+define KernelPackage/pcf857x/description
+ Kernel modules for PCF857x I2C GPIO extenders.
+endef
+
+$(eval $(call KernelPackage,pcf857x))
 $(eval $(call KernelPackage,octeon-i2c))