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.Dd October 1, 2006 .Dt INTERSIL7170 4 .Os .Sh NAME .Nm intersil7170 .Nd .Tn Intersil ICM7170 time-of-day clock driver .Sh SYNOPSIS n dev/ic/intersil7170reg.h n dev/ic/intersil7170var.h .Cd "define intersil7170" .Cd "file dev/ic/intersil7170.c intersil7170" .Sh DESCRIPTION The .Nm driver provides access to the .Tn Intersil ICM7170 time-of-day clock chip. Access methods to retrieve and set date and time are provided through the .Em TODR interface defined in .Xr todr 9 .
p To tie an instance of this device to the system, use the .Fn intersil7170_attach function and the .Fa intersil7170_softc structure defined as follows:
p .Ft "void" .Fn intersil7170_attach "struct intersil7170_softc *"
p d -literal 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; }; .Ed
p l -tag -width Dv -offset indent t Fa bus_tag t Fa bus_handle Specify bus space access to the chip's non-volatile memory
q including the clock registers . t Fa sc_handle TODR handle passed to the .Fn todr_attach function to register .Xr todr 9 interface. t Fa sc_year0 The actual year represented by the clock's .Sq 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. t Fa sc_flag This flag is used to specify machine-dependent features. .El
p 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 .Va INTERSIL7170_NO_CENT_ADJUST flag in .Fa sc_flag . .Sh SEE ALSO .Xr intro 4 , .Xr todr 9 .Sh HISTORY The .Nm driver first appeared in .Nx 1.5 . .Sh AUTHORS The .Nm driver was written by .An Paul Kranenburg .Aq pk (at] NetBSD.org .
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