1.\" $NetBSD: intersil7170.4,v 1.6 2002/02/13 08:17:37 ross Exp $ 2.\" 3.\" Copyright (c) 2000 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Paul Kranenburg. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the NetBSD 20.\" Foundation, Inc. and its contributors. 21.\" 4. Neither the name of The NetBSD Foundation nor the names of its 22.\" contributors may be used to endorse or promote products derived 23.\" from this software without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" 37.Dd July 20, 2000 38.Dt INTERSIL7170 4 39.Os 40.Sh NAME 41.Nm intersil7170 42.Nd 43.Tn Intersil time-of-day clock driver 44.Sh SYNOPSIS 45.Fd #include \*[Lt]dev/ic/intersil7170.h\*[Gt] 46.Cd "define intersil7170" 47.Cd "file dev/ic/intersil7170.c intersil7170" 48.Sh DESCRIPTION 49The 50.Nm 51driver provides access to the 52.Tn Intersil 7170 53time-of-day clock chip. Access methods to retrieve and set date and time 54are provided through the 55.Em TODR 56interface defined in 57.Xr todr 9 . 58.Pp 59To tie in instance of this device to the system, use 60.nr nS 1 61.Ft "todr_chip_handle_t" 62.Fn intersil7170_attach "bus_space_tag_t bus_tag" \ 63"bus_space_handle_t bus_handle" "int year0" 64.Pp 65.Bl -tag -width Dv -offset indent 66.It Fa bus_tag 67.It Fa bus_handle 68Specify bus space access to the chip's non-volatile memory 69.Pq including the clock registers . 70.It Fa year0 71The actual year represented by the clock's 72.Sq year 73counter. This is generally dependent on the system configuration in which 74the clock device is mounted. For instance, on Sun Microsystems machines 75the convention is to have clock's two-digit year represent the year 1968. 76.El 77.Pp 78Note that if the resulting date retrieved with the todr_gettime() method 79is earlier that January 1, 1970, the driver will assume that the chip's 80year counter actually represents a year in the 21st century. This 81behaviour can be overridden by setting the global variable 82.Va intersil7170_auto_century_adjust 83to zero. 84.Sh SEE ALSO 85.Xr intro 4 , 86.Xr todr 9 87.Sh HISTORY 88The 89.Nm 90driver first appeared in 91.Nx 1.5 . 92.Sh AUTHORS 93The 94.Nm 95driver was written by 96.An Paul Kranenburg 97.Aq pk@netbsd.org . 98