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todr_settime(9) [netbsd man page]

TODR(9) 						   BSD Kernel Developer's Manual						   TODR(9)

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

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

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 <>. BSD
October 1, 2006 BSD
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