183 lines
4.6 KiB
C
183 lines
4.6 KiB
C
/*-
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* Copyright (c) 2006 Sam Leffler. 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 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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* Dallas Semiconductor DS1672 RTC sitting on the I2C bus.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/clock.h>
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#include <sys/time.h>
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#include <sys/bus.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <dev/iicbus/iiconf.h>
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#include "iicbus_if.h"
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#include "clock_if.h"
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#define IIC_M_WR 0 /* write operation */
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#define DS1672_ADDR 0xd0 /* slave address */
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#define DS1672_COUNTER 0 /* counter (bytes 0-3) */
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#define DS1672_CTRL 4 /* control (1 byte) */
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#define DS1672_TRICKLE 5 /* trickle charger (1 byte) */
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#define DS1672_CTRL_EOSC (1 << 7) /* Stop/start flag. */
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#define NANOSEC 1000000000
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#define MAX_IIC_DATA_SIZE 4
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struct ds1672_softc {
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device_t sc_dev;
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};
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static int
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ds1672_probe(device_t dev)
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{
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/* XXX really probe? */
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device_set_desc(dev, "Dallas Semiconductor DS1672 RTC");
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return (BUS_PROBE_NOWILDCARD);
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}
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static int
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ds1672_read(device_t dev, uint8_t addr, uint8_t *data, uint8_t size)
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{
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struct iic_msg msgs[2] = {
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{ DS1672_ADDR, IIC_M_WR, 1, &addr },
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{ DS1672_ADDR, IIC_M_RD, size, data }
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};
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return (iicbus_transfer(dev, msgs, 2));
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}
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static int
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ds1672_write(device_t dev, uint8_t addr, uint8_t *data, uint8_t size)
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{
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uint8_t buffer[MAX_IIC_DATA_SIZE + 1];
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struct iic_msg msgs[1] = {
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{ DS1672_ADDR, IIC_M_WR, size + 1, buffer },
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};
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if (size > MAX_IIC_DATA_SIZE)
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return (ENOMEM);
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/* NB: register pointer precedes actual data */
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buffer[0] = addr;
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memcpy(buffer + 1, data, size);
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return (iicbus_transfer(dev, msgs, 1));
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}
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static int
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ds1672_init(device_t dev)
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{
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uint8_t ctrl;
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int error;
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error = ds1672_read(dev, DS1672_CTRL, &ctrl, 1);
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if (error)
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return (error);
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/*
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* Check if oscialltor is not runned.
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*/
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if (ctrl & DS1672_CTRL_EOSC) {
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device_printf(dev, "RTC oscillator was stopped. Check system"
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" time and RTC battery.\n");
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ctrl &= ~DS1672_CTRL_EOSC; /* Start oscillator. */
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error = ds1672_write(dev, DS1672_CTRL, &ctrl, 1);
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}
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return (error);
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}
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static int
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ds1672_attach(device_t dev)
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{
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struct ds1672_softc *sc = device_get_softc(dev);
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int error;
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sc->sc_dev = dev;
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error = ds1672_init(dev);
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if (error)
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return (error);
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clock_register(dev, 1000);
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return (0);
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}
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static int
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ds1672_gettime(device_t dev, struct timespec *ts)
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{
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uint8_t secs[4];
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int error;
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error = ds1672_read(dev, DS1672_COUNTER, secs, 4);
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if (error == 0) {
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/* counter has seconds since epoch */
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ts->tv_sec = (secs[3] << 24) | (secs[2] << 16)
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| (secs[1] << 8) | (secs[0] << 0);
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ts->tv_nsec = NANOSEC / 2;
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}
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return (error);
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}
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static int
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ds1672_settime(device_t dev, struct timespec *ts)
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{
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uint8_t data[4];
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data[0] = (ts->tv_sec >> 0) & 0xff;
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data[1] = (ts->tv_sec >> 8) & 0xff;
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data[2] = (ts->tv_sec >> 16) & 0xff;
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data[3] = (ts->tv_sec >> 24) & 0xff;
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return (ds1672_write(dev, DS1672_COUNTER, data, 4));
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}
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static device_method_t ds1672_methods[] = {
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DEVMETHOD(device_probe, ds1672_probe),
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DEVMETHOD(device_attach, ds1672_attach),
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DEVMETHOD(clock_gettime, ds1672_gettime),
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DEVMETHOD(clock_settime, ds1672_settime),
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DEVMETHOD_END
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};
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static driver_t ds1672_driver = {
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"ds1672_rtc",
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ds1672_methods,
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sizeof(struct ds1672_softc),
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};
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static devclass_t ds1672_devclass;
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DRIVER_MODULE(ds1672, iicbus, ds1672_driver, ds1672_devclass, 0, 0);
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MODULE_VERSION(ds1672, 1);
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MODULE_DEPEND(ds1672, iicbus, 1, 1, 1);
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