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.\" $NetBSD: intersil7170.4,v 1.8 2003/04/16 13:35:17 wiz Exp $
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.\" $NetBSD: intersil7170.4,v 1.9 2003/06/27 18:32:02 wiz Exp $
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.\"
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.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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@ -50,14 +50,15 @@ The
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.Nm
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driver provides access to the
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.Tn Intersil 7170
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time-of-day clock chip. Access methods to retrieve and set date and time
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time-of-day clock chip.
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Access methods to retrieve and set date and time
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are provided through the
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.Em TODR
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interface defined in
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.Xr todr 9 .
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.Pp
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To tie in instance of this device to the system, use
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.nr nS 1
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To tie an instance of this device to the system, use
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.Pp
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.Ft "todr_chip_handle_t"
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.Fn intersil7170_attach "bus_space_tag_t bus_tag" \
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"bus_space_handle_t bus_handle" "int year0"
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.It Fa year0
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The actual year represented by the clock's
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.Sq year
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counter. This is generally dependent on the system configuration in which
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the clock device is mounted. For instance, on Sun Microsystems machines
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counter.
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This is generally dependent on the system configuration in which
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the clock device is mounted.
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For instance, on Sun Microsystems machines
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the convention is to have clock's two-digit year represent the year 1968.
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.El
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.Pp
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Note that if the resulting date retrieved with the todr_gettime() method
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is earlier that January 1, 1970, the driver will assume that the chip's
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year counter actually represents a year in the 21st century. This
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behaviour can be overridden by setting the global variable
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year counter actually represents a year in the 21st century.
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This behaviour can be overridden by setting the global variable
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.Va intersil7170_auto_century_adjust
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to zero.
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.Sh SEE ALSO
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