Move the pcf8591 driver to hwmon

Directory drivers/i2c/chips is going away, so drivers there must find
new homes. For the pcf8591 driver, the best choice seems to be the
hwmon subsystem. While the Philips PCF8591 device isn't a typical
hardware monitoring chip, its DAC interface is compatible with the
hwmon one, so it fits somewhat.

If a better subsystem is ever created for ADC/DAC chips, the driver
could be moved there.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Aurelien Jarno <aurelien@aurel32.net>

drivers/hwmon/Kconfig

@@ -635,6 +635,20 @@ config SENSORS_PC87427
 	  This driver can also be built as a module.  If so, the module
 	  will be called pc87427.
 
+config SENSORS_PCF8591
+	tristate "Philips PCF8591 ADC/DAC"
+	depends on I2C
+	default n
+	help
+	  If you say yes here you get support for Philips PCF8591 4-channel
+	  ADC, 1-channel DAC chips.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called pcf8591.
+
+	  These devices are hard to detect and rarely found on mainstream
+	  hardware.  If unsure, say N.
+
 config SENSORS_SIS5595
 	tristate "Silicon Integrated Systems Corp. SiS5595"
 	depends on PCI

drivers/hwmon/Makefile

@@ -70,6 +70,7 @@ obj-$(CONFIG_SENSORS_MAX1619)	+= max1619.o
 obj-$(CONFIG_SENSORS_MAX6650)	+= max6650.o
 obj-$(CONFIG_SENSORS_PC87360)	+= pc87360.o
 obj-$(CONFIG_SENSORS_PC87427)	+= pc87427.o
+obj-$(CONFIG_SENSORS_PCF8591)	+= pcf8591.o
 obj-$(CONFIG_SENSORS_SIS5595)	+= sis5595.o
 obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
 obj-$(CONFIG_SENSORS_SMSC47M1)	+= smsc47m1.o

drivers/i2c/chips/Kconfig

@@ -64,19 +64,6 @@ config SENSORS_PCA9539
 	  This driver is deprecated and will be dropped soon. Use
 	  drivers/gpio/pca953x.c instead.
 
-config SENSORS_PCF8591
-	tristate "Philips PCF8591"
-	depends on EXPERIMENTAL
-	default n
-	help
-	  If you say yes here you get support for Philips PCF8591 chips.
-
-	  This driver can also be built as a module.  If so, the module
-	  will be called pcf8591.
-
-	  These devices are hard to detect and rarely found on mainstream
-	  hardware.  If unsure, say N.
-
 config SENSORS_MAX6875
 	tristate "Maxim MAX6875 Power supply supervisor"
 	depends on EXPERIMENTAL

drivers/i2c/chips/Makefile

@@ -15,7 +15,6 @@ obj-$(CONFIG_SENSORS_MAX6875)	+= max6875.o
 obj-$(CONFIG_SENSORS_PCA9539)	+= pca9539.o
 obj-$(CONFIG_SENSORS_PCF8574)	+= pcf8574.o
 obj-$(CONFIG_PCF8575)		+= pcf8575.o
-obj-$(CONFIG_SENSORS_PCF8591)	+= pcf8591.o
 obj-$(CONFIG_SENSORS_TSL2550)	+= tsl2550.o
 
 ifeq ($(CONFIG_I2C_DEBUG_CHIP),y)