iio: imu: Add support for Kionix KMX61 sensor

Minimal implementation for KMX61 6-axis accelerometer/magnetometer. It exports
raw accel/magn readings together with scale and sampling frequency.

This driver uses two IIO devices one for accelerometer and one for magnetometer.

Datasheet will be available at:
http://www.kionix.com/6-axis-accelerometer-magnetometer/kmx61

Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/imu/Kconfig

@@ -25,6 +25,15 @@ config ADIS16480
 	  Say yes here to build support for Analog Devices ADIS16375, ADIS16480,
 	  ADIS16485, ADIS16488 inertial sensors.
 
+config KMX61
+	tristate "Kionix KMX61 6-axis accelerometer and magnetometer"
+	depends on I2C
+	help
+	  Say Y here if you want to build a driver for Kionix KMX61 6-axis
+	  accelerometer and magnetometer.
+	  To compile this driver as module, choose M here: the module will
+	  be called kmx61.
+
 source "drivers/iio/imu/inv_mpu6050/Kconfig"
 
 endmenu

drivers/iio/imu/Makefile

@@ -14,3 +14,5 @@ adis_lib-$(CONFIG_IIO_ADIS_LIB_BUFFER) += adis_buffer.o
 obj-$(CONFIG_IIO_ADIS_LIB) += adis_lib.o
 
 obj-y += inv_mpu6050/
+
+obj-$(CONFIG_KMX61) += kmx61.o