clock_secs_to_ymdhms(9) [netbsd 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

MK48TXX(4)						   BSD Kernel Interfaces Manual 						MK48TXX(4)

NAME

     mk48txx -- Mostek time-of-day clock driver

SYNOPSIS

     #include <dev/ic/mk48txxreg.h>
     #include <dev/ic/mk48txxvar.h>
     define mk48txx
     file   dev/ic/mk48txx.c	mk48txx

DESCRIPTION

     The mk48txx driver provides access to several models of Mostek time-of-day clock chips.  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 mk48txx_attach() function and the mk48txx_softc structure defined as follows:

     void mk48txx_attach(struct mk48txx_softc *)

     typedef uint8_t (*mk48txx_nvrd_t)(struct mk48txx_softc *, int off);
     typedef void (*mk48txx_nvwr_t)(struct mk48txx_softc *, int off,
	 uint8_t datum);

     struct mk48txx_softc {
	     struct device   sc_dev;
	     bus_space_tag_t sc_bst;
	     bus_space_handle_t sc_bsh;
	     struct todr_chip_handle sc_handle;
	     const char      *sc_model;
	     bus_size_t      sc_nvramsz;
	     bus_size_t      sc_clkoffset;
	     u_int	     sc_year0;
	     u_int	     sc_flag;
	     mk48txx_nvrd_t  sc_nvrd;
	     mk48txx_nvwr_t  sc_nvwr;
     };

	   sc_bst

	   sc_bsh	 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_model	 The chip model which this instance should serve.  Must be one of ``mk48t02'', ``mk48t08'', ``mk48t18'', or ``mk48t59''.

	   sc_nvramsz	 Size of non-volatile RAM in the Mostek chip.  This value is set by mk48txx_attach().

	   sc_clkoffset  Offset into the control registers of the Mostek chip.	This value is set by mk48txx_attach().

	   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.

	   sc_nvread

	   sc_nvwrite	 Specify alternate access methods for reading resp. writing clock device registers.  The default, when NULL is passed as
			 an access method, is to access the chip memory (and clock registers) as if they were direct-mapped with using the speci-
			 fied bus space.

			 Otherwise, the driver will call the respective function to perform the access, passing it the specified bus space and the
			 offset off of the chip memory (or clock register) location to be read from or written to, respectively.

     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 MK48TXX_NO_CENT_ADJUST
     flag in sc_flag.

HARDWARE

     The following models are supported:

	   Mostek MK48T02
	   Mostek MK48T08
	   Mostek MK48T18
	   Mostek MK48T59

SEE ALSO

     intro(4), todr(9)

HISTORY

     The mk48txx driver first appeared in NetBSD 1.5.

AUTHORS

     The mk48txx driver was written by Paul Kranenburg <pk@NetBSD.org>.

BSD
								  October 1, 2006							       BSD