hmc6352: add driver for the HMC6352 compass

This driver will report the heading values in degrees to the sysfs
interface.  The values returned are headings .  e.g.  245.6

Alan: Cleanups requested now all folded in and a sysfs description to keep
Andrew happy. The sysfs description now resembles hwmon.

Signed-off-by: Kalhan Trisal <kalhan.trisal@intel.com>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-i2c-devices-hm6352 b/Documentation/ABI/testing/sysfs-bus-i2c-devices-hm6352
new file mode 100644
index 00000000000..feb2e4a8707
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-i2c-devices-hm6352
@@ -0,0 +1,21 @@
+Where:          /sys/bus/i2c/devices/.../heading0_input
+Date:           April 2010
+Kernel Version: 2.6.36?
+Contact:        alan.cox@intel.com
+Description:    Reports the current heading from the compass as a floating
+                point value in degrees.
+
+Where:          /sys/bus/i2c/devices/.../power_state
+Date:           April 2010
+Kernel Version: 2.6.36?
+Contact:        alan.cox@intel.com
+Description:    Sets the power state of the device. 0 sets the device into
+                sleep mode, 1 wakes it up.
+
+Where:          /sys/bus/i2c/devices/.../calibration
+Date:           April 2010
+Kernel Version: 2.6.36?
+Contact:        alan.cox@intel.com
+Description:    Sets the calibration on or off (1 = on, 0 = off). See the
+                chip data sheet.
+