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INTERSIL7170(4)              Device Drivers Manual             INTERSIL7170(4)

NAME
     intersil7170 - Intersil ICM7170 time-of-day clock driver

SYNOPSIS
     #include <dev/ic/intersil7170reg.h>
     #include <dev/ic/intersil7170var.h>

     define intersil7170
     file   dev/ic/intersil7170.c    intersil7170

DESCRIPTION
     The intersil7170 driver provides access to the Intersil ICM7170 time-of-
     day clock chip.  Access methods to retrieve and set date and time are
     provided through the TODR interface defined in todr(9).

     To tie an instance of this device to the system, use the
     intersil7170_attach() function and the intersil7170_softc structure
     defined as follows:

     void intersil7170_attach(struct intersil7170_softc *)

     struct intersil7170_softc {
             struct device   sc_dev;
             bus_space_tag_t sc_bst;
             bus_space_handle_t sc_bsh;
             struct todr_chip_handle sc_handle;
             u_int           sc_year0;
             u_int           sc_flag;
     };

           bus_tag

           bus_handle    Specify bus space access to the chip's non-volatile
                         memory (including the clock registers).

           sc_handle     TODR handle passed to the todr_attach() function to
                         register todr(9) interface.

           sc_year0      The actual year represented by the clock's `year'
                         counter.  This is generally dependent on the system
                         configuration in which the clock device is mounted.
                         For instance, on Sun Microsystems machines the
                         convention is to have clock's two-digit year
                         represent the year 1968.

           sc_flag       This flag is used to specify machine-dependent
                         features.

     Note that if the resulting date retrieved with the todr_gettime() method
     is earlier that January 1, 1970, the driver will assume that the chip's
     year counter actually represents a year in the 21st century.  This
     behaviour can be overridden by setting the INTERSIL7170_NO_CENT_ADJUST
     flag in sc_flag.

SEE ALSO
     intro(4), todr(9)

HISTORY
     The intersil7170 driver first appeared in NetBSD 1.5.

AUTHORS
     The intersil7170 driver was written by Paul Kranenburg <pk@NetBSD.org>.

NetBSD 10.99                    October 1, 2006                   NetBSD 10.99