INTERSIL7170(4)

💖 INTERSIL7170(4) — intersil7170 💖

✨ NAME ✨

intersil7170 — Intersil ICM7170 time-of-day clock driver 🕰️

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🌸 SYNOPSIS 🌸

#include <dev/ic/intersil7170reg.h>
#include <dev/ic/intersil7170var.h>
define intersil7170
file   dev/ic/intersil7170.c    intersil7170

🦋 DESCRIPTION 🦋

okay so the intersil7170 driver gives you 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). slay.

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;
};

then the field tea ☕:

• 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.

lowkey key detail: if the resulting date retrieved with the todr_gettime() method is earlier than 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. no cap 🫶

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👀 SEE ALSO 👀

intro(4), todr(9)

📜 HISTORY 📜

The intersil7170 driver first appeared in NetBSD 1.5. periodt 💅

👑 AUTHORS 👑

The intersil7170 driver was written by Paul Kranenburg ⟨pk@NetBSD.org⟩. 💖

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xoxo, this page is from Debian — October 1, 2006 🎀 INTERSIL7170(4) 🦋