* Contact us first.
  You are of course free to write your own drivers, but it is smart to
  check first nobody else is already working on it.
* Write the new driver. 
  For a chip driver, use lm78.c as template. For an SMBus-only adapter, 
  use i2c-piix4.c. Use i2c-via.c for an I2C-level adapter.
  Usually, we make all prefixes start with the driver name. This is not
  really necessary, as these symbols will not be exported anyway. But by
  doing this, you are sure you do not shadow any global kernel names.
  Remember that you want to output the direct measurements done by the
  chip. If these sensor values need scaling, this should be done through
  the configuration file.
* Add the driver to the Makefile.
  Usually, you can just add it to KERNEL{CHIPS,DRIVERS}TARGETS in the
  Module.mk file in the directory itself.
* Make sure it compiles cleanly.
  If you compile with 'make WARN=1', you usually get many additional
  warnings. Please resolve these too, even if you know they are
  harmless. Do the same with 'make DEBUG=1 WARN=1' if you use debugging
  information. Remember, things put between #ifdef DEBUG #endif may never
  stop the driver from functioning; they should just output additional
  information.
* Check for external symbols
  'nm --extern --defined' should only output symbols starting with __module,
  cleanup_module, init_module and some kernel versioning symbols. Mark all
  other symbols as static in your source file.
* Test the module
  This is usually the boring part...
* Add detection information to prog/detect/sensors-detect
  This is a perl script that automatically detects what chips and adapters
  are present. Contact Frodo if you need help.
* Add chip information to lib/chips.{c,h} for chip drivers
  Until you have done this, the chip will be invisible for user-level
  programs. Again, contact Frodo if you need help with this.
* Add entries to etc/sensors.conf.eg
  If needed, you can set defaults here.
* Add a dedicated procedure to prog/sensors/chips.[ch]
  This makes the included sensors program pretty-print your chip information.