cc8a3448d9
This is compatible with the ds1307, but comparing the mcp7941x datasheet vs the ds1307 code, appears there is one bit placement difference, so that is now accounted for. Relnotes: yes
437 lines
11 KiB
C
437 lines
11 KiB
C
/*-
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* Copyright (c) 2015 Luiz Otavio O Souza <loos@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Driver for Maxim DS1307 I2C real-time clock/calendar.
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*/
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/clock.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/sysctl.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#ifdef FDT
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#endif
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#include <dev/iicbus/ds1307reg.h>
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#include "clock_if.h"
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#include "iicbus_if.h"
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struct ds1307_softc {
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device_t sc_dev;
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int sc_year0;
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struct intr_config_hook enum_hook;
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uint16_t sc_addr; /* DS1307 slave address. */
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uint8_t sc_ctrl;
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int sc_mcp7941x;
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};
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static void ds1307_start(void *);
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#ifdef FDT
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static const struct ofw_compat_data ds1307_compat_data[] = {
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{"dallas,ds1307", (uintptr_t)"Maxim DS1307 RTC"},
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{"maxim,ds1307", (uintptr_t)"Maxim DS1307 RTC"},
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{"microchip,mcp7941x", (uintptr_t)"Microchip MCP7941x RTC"},
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{ NULL, 0 }
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};
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#endif
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static int
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ds1307_read(device_t dev, uint16_t addr, uint8_t reg, uint8_t *data, size_t len)
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{
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struct iic_msg msg[2] = {
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{ addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® },
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{ addr, IIC_M_RD, len, data },
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};
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return (iicbus_transfer(dev, msg, nitems(msg)));
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}
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static int
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ds1307_write(device_t dev, uint16_t addr, uint8_t *data, size_t len)
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{
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struct iic_msg msg[1] = {
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{ addr, IIC_M_WR, len, data },
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};
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return (iicbus_transfer(dev, msg, nitems(msg)));
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}
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static int
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ds1307_ctrl_read(struct ds1307_softc *sc)
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{
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int error;
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sc->sc_ctrl = 0;
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error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_CONTROL,
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&sc->sc_ctrl, sizeof(sc->sc_ctrl));
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if (error) {
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device_printf(sc->sc_dev, "cannot read from RTC.\n");
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return (error);
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}
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return (0);
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}
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static int
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ds1307_ctrl_write(struct ds1307_softc *sc)
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{
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int error;
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uint8_t data[2];
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data[0] = DS1307_CONTROL;
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data[1] = sc->sc_ctrl & DS1307_CTRL_MASK;
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error = ds1307_write(sc->sc_dev, sc->sc_addr, data, sizeof(data));
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if (error != 0)
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device_printf(sc->sc_dev, "cannot write to RTC.\n");
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return (error);
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}
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static int
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ds1307_osc_enable(struct ds1307_softc *sc)
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{
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int error;
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uint8_t data[2], secs;
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secs = 0;
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error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_SECS,
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&secs, sizeof(secs));
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if (error) {
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device_printf(sc->sc_dev, "cannot read from RTC.\n");
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return (error);
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}
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/* Check if the oscillator is disabled. */
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if ((secs & DS1307_SECS_CH) == 0)
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return (0);
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device_printf(sc->sc_dev, "clock was halted, check the battery.\n");
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data[0] = DS1307_SECS;
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data[1] = secs & DS1307_SECS_MASK;
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error = ds1307_write(sc->sc_dev, sc->sc_addr, data, sizeof(data));
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if (error != 0)
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device_printf(sc->sc_dev, "cannot write to RTC.\n");
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return (error);
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}
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static int
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ds1307_set_24hrs_mode(struct ds1307_softc *sc)
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{
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int error;
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uint8_t data[2], hour;
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hour = 0;
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error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_HOUR,
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&hour, sizeof(hour));
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if (error) {
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device_printf(sc->sc_dev, "cannot read from RTC.\n");
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return (error);
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}
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data[0] = DS1307_HOUR;
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data[1] = hour & DS1307_HOUR_MASK;
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error = ds1307_write(sc->sc_dev, sc->sc_addr, data, sizeof(data));
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if (error != 0)
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device_printf(sc->sc_dev, "cannot write to RTC.\n");
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return (error);
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}
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static int
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ds1307_sqwe_sysctl(SYSCTL_HANDLER_ARGS)
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{
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int sqwe, error, newv, sqwe_bit;
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struct ds1307_softc *sc;
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sc = (struct ds1307_softc *)arg1;
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error = ds1307_ctrl_read(sc);
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if (error != 0)
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return (error);
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if (sc->sc_mcp7941x)
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sqwe_bit = MCP7941X_CTRL_SQWE;
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else
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sqwe_bit = DS1307_CTRL_SQWE;
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sqwe = newv = (sc->sc_ctrl & sqwe_bit) ? 1 : 0;
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error = sysctl_handle_int(oidp, &newv, 0, req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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if (sqwe != newv) {
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sc->sc_ctrl &= ~sqwe_bit;
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if (newv)
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sc->sc_ctrl |= sqwe_bit;
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error = ds1307_ctrl_write(sc);
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if (error != 0)
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return (error);
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}
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return (error);
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}
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static int
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ds1307_sqw_freq_sysctl(SYSCTL_HANDLER_ARGS)
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{
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int ds1307_sqw_freq[] = { 1, 4096, 8192, 32768 };
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int error, freq, i, newf, tmp;
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struct ds1307_softc *sc;
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sc = (struct ds1307_softc *)arg1;
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error = ds1307_ctrl_read(sc);
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if (error != 0)
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return (error);
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tmp = (sc->sc_ctrl & DS1307_CTRL_RS_MASK);
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if (tmp >= nitems(ds1307_sqw_freq))
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tmp = nitems(ds1307_sqw_freq) - 1;
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freq = ds1307_sqw_freq[tmp];
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error = sysctl_handle_int(oidp, &freq, 0, req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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if (freq != ds1307_sqw_freq[tmp]) {
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newf = 0;
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for (i = 0; i < nitems(ds1307_sqw_freq); i++)
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if (freq >= ds1307_sqw_freq[i])
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newf = i;
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sc->sc_ctrl &= ~DS1307_CTRL_RS_MASK;
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sc->sc_ctrl |= newf;
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error = ds1307_ctrl_write(sc);
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if (error != 0)
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return (error);
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}
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return (error);
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}
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static int
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ds1307_sqw_out_sysctl(SYSCTL_HANDLER_ARGS)
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{
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int sqwe, error, newv;
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struct ds1307_softc *sc;
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sc = (struct ds1307_softc *)arg1;
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error = ds1307_ctrl_read(sc);
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if (error != 0)
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return (error);
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sqwe = newv = (sc->sc_ctrl & DS1307_CTRL_OUT) ? 1 : 0;
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error = sysctl_handle_int(oidp, &newv, 0, req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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if (sqwe != newv) {
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sc->sc_ctrl &= ~DS1307_CTRL_OUT;
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if (newv)
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sc->sc_ctrl |= DS1307_CTRL_OUT;
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error = ds1307_ctrl_write(sc);
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if (error != 0)
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return (error);
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}
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return (error);
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}
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static int
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ds1307_probe(device_t dev)
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{
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#ifdef FDT
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const struct ofw_compat_data *compat;
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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compat = ofw_bus_search_compatible(dev, ds1307_compat_data);
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if (compat == NULL)
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return (ENXIO);
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device_set_desc(dev, (const char *)compat->ocd_data);
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return (BUS_PROBE_DEFAULT);
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#else
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device_set_desc(dev, "Maxim DS1307 RTC");
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return (BUS_PROBE_DEFAULT);
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#endif
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}
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static int
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ds1307_attach(device_t dev)
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{
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struct ds1307_softc *sc;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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sc->sc_addr = iicbus_get_addr(dev);
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sc->sc_year0 = 1900;
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sc->enum_hook.ich_func = ds1307_start;
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sc->enum_hook.ich_arg = dev;
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if (ofw_bus_is_compatible(dev, "microchip,mcp7941x"))
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sc->sc_mcp7941x = 1;
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/*
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* We have to wait until interrupts are enabled. Usually I2C read
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* and write only works when the interrupts are available.
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*/
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if (config_intrhook_establish(&sc->enum_hook) != 0)
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return (ENOMEM);
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return (0);
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}
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static void
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ds1307_start(void *xdev)
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{
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device_t dev;
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struct ds1307_softc *sc;
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struct sysctl_ctx_list *ctx;
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struct sysctl_oid *tree_node;
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struct sysctl_oid_list *tree;
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dev = (device_t)xdev;
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sc = device_get_softc(dev);
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ctx = device_get_sysctl_ctx(dev);
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tree_node = device_get_sysctl_tree(dev);
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tree = SYSCTL_CHILDREN(tree_node);
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config_intrhook_disestablish(&sc->enum_hook);
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/* Set the 24 hours mode. */
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if (ds1307_set_24hrs_mode(sc) != 0)
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return;
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/* Enable the oscillator if halted. */
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if (ds1307_osc_enable(sc) != 0)
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return;
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/* Configuration parameters. */
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SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "sqwe",
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CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_MPSAFE, sc, 0,
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ds1307_sqwe_sysctl, "IU", "DS1307 square-wave enable");
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SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "sqw_freq",
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CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_MPSAFE, sc, 0,
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ds1307_sqw_freq_sysctl, "IU",
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"DS1307 square-wave output frequency");
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SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "sqw_out",
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CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_MPSAFE, sc, 0,
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ds1307_sqw_out_sysctl, "IU", "DS1307 square-wave output state");
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/* 1 second resolution. */
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clock_register(dev, 1000000);
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}
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static int
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ds1307_gettime(device_t dev, struct timespec *ts)
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{
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int error;
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struct clocktime ct;
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struct ds1307_softc *sc;
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uint8_t data[7];
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sc = device_get_softc(dev);
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memset(data, 0, sizeof(data));
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error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_SECS,
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data, sizeof(data));
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if (error != 0) {
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device_printf(dev, "cannot read from RTC.\n");
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return (error);
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}
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ct.nsec = 0;
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ct.sec = FROMBCD(data[DS1307_SECS] & DS1307_SECS_MASK);
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ct.min = FROMBCD(data[DS1307_MINS] & DS1307_MINS_MASK);
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ct.hour = FROMBCD(data[DS1307_HOUR] & DS1307_HOUR_MASK);
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ct.day = FROMBCD(data[DS1307_DATE] & DS1307_DATE_MASK);
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ct.dow = data[DS1307_WEEKDAY] & DS1307_WEEKDAY_MASK;
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ct.mon = FROMBCD(data[DS1307_MONTH] & DS1307_MONTH_MASK);
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ct.year = FROMBCD(data[DS1307_YEAR] & DS1307_YEAR_MASK);
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ct.year += sc->sc_year0;
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if (ct.year < POSIX_BASE_YEAR)
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ct.year += 100; /* assume [1970, 2069] */
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return (clock_ct_to_ts(&ct, ts));
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}
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static int
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ds1307_settime(device_t dev, struct timespec *ts)
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{
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int error;
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struct clocktime ct;
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struct ds1307_softc *sc;
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uint8_t data[8];
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sc = device_get_softc(dev);
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/* Accuracy is only one second. */
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if (ts->tv_nsec >= 500000000)
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ts->tv_sec++;
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ts->tv_nsec = 0;
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clock_ts_to_ct(ts, &ct);
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memset(data, 0, sizeof(data));
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data[0] = DS1307_SECS;
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data[DS1307_SECS + 1] = TOBCD(ct.sec);
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data[DS1307_MINS + 1] = TOBCD(ct.min);
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data[DS1307_HOUR + 1] = TOBCD(ct.hour);
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data[DS1307_DATE + 1] = TOBCD(ct.day);
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data[DS1307_WEEKDAY + 1] = ct.dow;
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data[DS1307_MONTH + 1] = TOBCD(ct.mon);
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data[DS1307_YEAR + 1] = TOBCD(ct.year % 100);
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/* Write the time back to RTC. */
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error = ds1307_write(dev, sc->sc_addr, data, sizeof(data));
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if (error != 0)
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device_printf(dev, "cannot write to RTC.\n");
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return (error);
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}
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static device_method_t ds1307_methods[] = {
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DEVMETHOD(device_probe, ds1307_probe),
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DEVMETHOD(device_attach, ds1307_attach),
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DEVMETHOD(clock_gettime, ds1307_gettime),
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DEVMETHOD(clock_settime, ds1307_settime),
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DEVMETHOD_END
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};
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static driver_t ds1307_driver = {
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"ds1307",
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ds1307_methods,
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sizeof(struct ds1307_softc),
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};
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static devclass_t ds1307_devclass;
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DRIVER_MODULE(ds1307, iicbus, ds1307_driver, ds1307_devclass, NULL, NULL);
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MODULE_VERSION(ds1307, 1);
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MODULE_DEPEND(ds1307, iicbus, 1, 1, 1);
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