Staging: add driver for adis16255 gyroscope

This drivers allows a communication with the Analog Devices ADIS16255
Low Power Gyroscope over SPI.

Signed-off-by: Matthias Brugger <mensch0815@gmail.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/adis16255/Kconfig

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+config ADIS16255
+	tristate "Ananlog Devices ADIS16250/16255"
+	depends on SPI && SYSFS
+	---help---
+      If you say yes here you get support for the Analog Devices
+      ADIS16250/16255 Low Power Gyroscope.
+
+      This driver can also be built as a module. If so, the module
+      will be called adis16255.

drivers/staging/adis16255/Makefile

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+obj-$(CONFIG_ADIS16255) +údis16255.o

drivers/staging/adis16255/TODO

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+* sample rate changeable or at least readable from sysfs
+* reset gyroscope
+* encapsulate adis_init and adis_turn_off
+* AD_CHK deletion
+* chip selftest in adis_init
+* reduce kernel messages to reasonable amount
+
+Contact: Matthias Brugger <mensch0815@gmail.com>