I2C device driver binding control from user-space
  =================================================
  
  Up to kernel 2.6.32, many i2c drivers used helper macros provided by
  <linux/i2c.h> which created standard module parameters to let the user
  control how the driver would probe i2c buses and attach to devices. These
  parameters were known as "probe" (to let the driver probe for an extra
  address), "force" (to forcibly attach the driver to a given device) and
  "ignore" (to prevent a driver from probing a given address).
  
  With the conversion of the i2c subsystem to the standard device driver
  binding model, it became clear that these per-module parameters were no
  longer needed, and that a centralized implementation was possible. The new,
  sysfs-based interface is described in the documentation file
  "instantiating-devices", section "Method 4: Instantiate from user-space".
  
  Below is a mapping from the old module parameters to the new interface.
  
  Attaching a driver to an I2C device
  -----------------------------------
  
  Old method (module parameters):
  # modprobe <driver> probe=1,0x2d
  # modprobe <driver> force=1,0x2d
  # modprobe <driver> force_<device>=1,0x2d
  
  New method (sysfs interface):
  # echo <device> 0x2d > /sys/bus/i2c/devices/i2c-1/new_device
  
  Preventing a driver from attaching to an I2C device
  ---------------------------------------------------
  
  Old method (module parameters):
  # modprobe <driver> ignore=1,0x2f
  
  New method (sysfs interface):
  # echo dummy 0x2f > /sys/bus/i2c/devices/i2c-1/new_device
  # modprobe <driver>
  
  Of course, it is important to instantiate the "dummy" device before loading
  the driver. The dummy device will be handled by i2c-core itself, preventing
  other drivers from binding to it later on. If there is a real device at the
  problematic address, and you want another driver to bind to it, then simply
  pass the name of the device in question instead of "dummy".