staging: adis16255 - TODO issues resolved and typos removed

This patch adds the adis16255 driver to the build system under the staging directory.
It solves also most issues mentioned in TODO list:
- sample rate exported to sysfs
- spi_adis16255_bringup and spi_adis16255_shutdown encapsulated
- chip selftest in spi_adis16255_bringup
- kernel messages reduced to a reasonable number
I removed the TODO file, because ther was only the reset of the gyroscope left.
This is IMOH not necessary for the actual driver.

There are also some typos in adis.c file. This patch should get rid of them as well.
Signed-off-by: Matthias Brugger <mensch0815@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/Kconfig

@@ -137,5 +137,7 @@ source "drivers/staging/cxt1e1/Kconfig"
 
 source "drivers/staging/ti-st/Kconfig"
 
+source "drivers/staging/adis16255/Kconfig"
+
 endif # !STAGING_EXCLUDE_BUILD
 endif # STAGING

drivers/staging/Makefile

@@ -49,3 +49,4 @@ obj-$(CONFIG_VIDEO_DT3155)	+= dt3155v4l/
 obj-$(CONFIG_CRYSTALHD)		+= crystalhd/
 obj-$(CONFIG_CXT1E1)		+= cxt1e1/
 obj-$(CONFIG_TI_ST)		+= ti-st/
+obj-$(CONFIG_ADIS16255))		+= adis16255/

drivers/staging/adis16255/Kconfig

@@ -2,8 +2,10 @@ 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.
+	If you say yes here you get support for the Analog Devices
+	ADIS16250/16255 Low Power Gyroscope. The driver exposes
+	orientation and gyroscope value, as well as sample rate
+	to the sysfs.
 
-      This driver can also be built as a module. If so, the module
-      will be called adis16255.
+	This driver can also be built as a module. If so, the module
+	will be called adis16255.

drivers/staging/adis16255/Makefile

-obj-$(CONFIG_ADIS16255) += adis1625.o
+obj-$(CONFIG_ADIS16255)		+= adis16255.o

drivers/staging/adis16255/TODO

-* 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>