Issues with HMC5883l 3 axis compass in custom blaze platform

Abhijit,

The driver for the HMC5883 is not included in the TI Android software releases.  However, there is an opensource version of the driver in kernel 3.5, and we have backported these patches to kernel 3.0 here: 

http://review.omapzoom.org/#/q/status:open+project:kernel/omap+branch:p-android-omap-3.0-dev+topic:HMC5883_support,n,z

As discussed in this thread http://e2e.ti.com/support/omap/f/849/p/212240/755605.aspx#755605, the HMC5843 driver used in the TI Android software releases is the one located in /drivers/input/misc/.  The HMC5883 driver from open source is located in /drivers/staging/iio/magnetometer.  Thus, you will need to modify the config to select this driver.  For example, you can:

1) Apply the HMC5883 patches from the link above

2) Change the device name from "hmc5843" to "hmc5883" in the Tablet kernel board file

3) Remove the hmc5843 driver from /drivers/input/misc/ from compilation  (ie, comment out the line from the Makefile "obj-$(CONFIG_INPUT_HMC5843) += hmc5843.o")

4) Select the driver in the menuconfig: Device Drivers -> Staging drivers -> Industrial I/O support -> Honeywell HMC5843/5883/5883L 3-Axis Magnetometer

The new driver creates nodes in the path "/sys/bus/iio/devices/deviceX"________, where X-number of the iio device.  The driver must check all devices names: "/sys/bus/iio/devices/deviceX/________name", select device, named "hmc5883" and work with him via sysfs nodes, placed in "/sys/bus/iio/devices/deviceX/________"

Note that the HMC5883 driver is not officially validated as part of the Blaze Tablet TI Android release, but hopefully you can use these patches as a starting point for your purposes.

Regards,
Gina