John Baldwin 697218c9b6 - Store the device_t of the smbX device in the softc.
- Store the softc of the device in the 'si_drv1' of the cdev.
- Lookup the softc via 'si_drv1' in cdev methods rather than using the
  minor number as a unit for devclass_get_softc().
- Lookup the device_t via the softc field in cdev methods rather than
  using the minor number as a unit for devclass_get_device().
- Add a mutex to the softc to protect 'sc_opened'.
- Remove D_NEEDGIANT as all the smbus drivers are now MPSAFE and this driver
  is now MPSAFE.
- Remove some checks for NULL softc pointers that can't happen and don't
  bzero the softc during attach.
2008-06-06 18:45:32 +00:00
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