INTERSIL7170(4) BSD Kernel Interfaces Manual INTERSIL7170(4)NAMEintersil7170 — 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 intersil7170DESCRIPTION
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 con‐
vention is to have clock's two-digit year represent
the year 1968.
sc_flag This flag is used to specify machine-dependent fea‐
tures.
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 behav‐
iour can be overridden by setting the INTERSIL7170_NO_CENT_ADJUST flag in
sc_flag.
SEE ALSOintro(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⟩.
BSD October 1, 2006 BSD
