staging:iio: Consolidate adt7310 and adt7410 driver

The adt7310 is the SPI version of the adt7410, so there is no need to have a
separate driver for it. The register map layout is a bit different, i.e. the
addresses of the register differ, but the individual register layouts are
identical. We solve this by adding a small look-up table, which translates
adt7410 register addresses to ad7310 register addresses.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/adc/Kconfig

@@ -126,18 +126,11 @@ config AD7192
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad7192.
 
-config ADT7310
-	tristate "Analog Devices ADT7310 temperature sensor driver"
-	depends on SPI
-	help
-	  Say yes here to build support for Analog Devices ADT7310
-	  temperature sensors.
-
 config ADT7410
-	tristate "Analog Devices ADT7410 temperature sensor driver"
-	depends on I2C
+	tristate "Analog Devices ADT7310/ADT7410 temperature sensor driver"
+	depends on I2C || SPI_MASTER
 	help
-	  Say yes here to build support for Analog Devices ADT7410
+	  Say yes here to build support for Analog Devices ADT7310/ADT7410
 	  temperature sensors.
 
 config AD7280

drivers/staging/iio/adc/Makefile

@@ -30,7 +30,6 @@ obj-$(CONFIG_AD7780) += ad7780.o
 obj-$(CONFIG_AD7793) += ad7793.o
 obj-$(CONFIG_AD7816) += ad7816.o
 obj-$(CONFIG_AD7192) += ad7192.o
-obj-$(CONFIG_ADT7310) += adt7310.o
 obj-$(CONFIG_ADT7410) += adt7410.o
 obj-$(CONFIG_AD7280) += ad7280a.o
 obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o