INTERSIL7170(4) BSD Kernel Interfaces 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 fol-
lows:
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>.
BSD October 1, 2006 BSD
Check Out this Related Man Page
TODR(9) BSD Kernel Developer's Manual TODR(9)NAME
todr_attach, todr_gettime, todr_settime, clock_ymdhms_to_secs, clock_secs_to_ymdhms -- time-of-day clock support
SYNOPSIS
#include <dev/clock_subr.h>
void
todr_attach(todr_chip_handle_t);
int
todr_gettime(todr_chip_handle_t, struct timeval *);
int
todr_settime(todr_chip_handle_t, struct timeval *);
void
clock_secs_to_ymdhms(int, struct clock_ymdhms *);
time_t
clock_ymdhms_to_secs(struct clock_ymdhms *);
DESCRIPTION
The todr_*() functions provide an interface to read, set and control 'time-of-day' devices. A driver for a 'time-of-day' device registers
its todr_chip_handle_t with machine-dependent code using the todr_attach() function. Alternatively, a machine-dependent front-end to a
'time-of-day' device driver may obtain the todr_chip_handle_t directly.
The todr_gettime() retrieves the current data and time from the TODR device and returns it in the struct timeval storage provided by the
caller. todr_settime() sets the date and time in the TODR device represented by todr_chip_handle_t according to the struct timeval argument.
The utilities clock_secs_to_ymdhms() and clock_ymdhms_to_secs() are provided to convert a time value in seconds to and from a structure rep-
resenting the date and time as a <year,month,day,weekday,hour,minute,seconds> tuple. This structure is defined as follows:
struct clock_ymdhms {
u_short dt_year; /* Year */
u_char dt_mon; /* Month (1-12) */
u_char dt_day; /* Day (1-31) */
u_char dt_wday; /* Day of week (0-6) */
u_char dt_hour; /* Hour (0-23) */
u_char dt_min; /* Minute (0-59) */
u_char dt_sec; /* Second (0-59) */
};
Note: leap years are recognised by these conversion routines.
RETURN VALUES
The todr_*() functions return 0 if the requested operation was successful; otherwise an error code from <sys/errno.h> shall be returned.
However, behaviour is undefined if an invalid todr_chip_handle_t is passed to any of these functions.
The clock_ymdhms_to_secs() function returns -1 if the time in seconds would be less that zero or too large to fit in a time_t. The
clock_secs_to_ymdhms() function never fails.
SEE ALSO intersil7170(4), mk48txx(4), inittodr(9), resettodr(9), time_second(9)BSD September 6, 2006 BSD