d0beb2c412
- ds1374u : use multi-byte write. - at24co2n, max6657: remove mutex, iicbus has the necessary locking. Submitted by: Sreekanth M. S. (kanthms at netlogicmicro com)
148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/*-
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* Copyright (c) 2003-2009 RMI Corporation
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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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* 3. Neither the name of RMI Corporation, nor the names of its contributors,
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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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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* RMI_BSD */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* RTC chip 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/bus.h>
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#include <sys/clock.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <mips/include/bus.h>
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#include <mips/include/cpu.h>
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#include <mips/include/cpufunc.h>
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#include <mips/include/frame.h>
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#include <mips/include/resource.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include "iicbus_if.h"
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#include "clock_if.h"
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#define DS1374_RTC_COUNTER 0 /* counter (bytes 0-3) */
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struct ds1374u_softc {
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uint32_t sc_addr;
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device_t sc_dev;
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};
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static int
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ds1374u_probe(device_t dev)
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{
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device_set_desc(dev, "DS1374U-33 RTC");
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return (0);
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}
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static int
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ds1374u_attach(device_t dev)
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{
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struct ds1374u_softc *sc = device_get_softc(dev);
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if(sc==NULL) {
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printf("ds1374u_attach device_get_softc failed\n");
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return (0);
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}
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sc->sc_dev = dev;
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sc->sc_addr = iicbus_get_addr(dev);
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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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ds1374u_settime(device_t dev, struct timespec *ts)
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{
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/* NB: register pointer precedes actual data */
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uint8_t data[5] = { DS1374_RTC_COUNTER };
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struct ds1374u_softc *sc = device_get_softc(dev);
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struct iic_msg msgs[1] = {
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{ sc->sc_addr, IIC_M_WR, 5, data },
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};
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data[1] = (ts->tv_sec >> 0) & 0xff;
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data[2] = (ts->tv_sec >> 8) & 0xff;
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data[3] = (ts->tv_sec >> 16) & 0xff;
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data[4] = (ts->tv_sec >> 24) & 0xff;
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return iicbus_transfer(dev, msgs, 1);
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}
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static int
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ds1374u_gettime(device_t dev, struct timespec *ts)
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{
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struct ds1374u_softc *sc = device_get_softc(dev);
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uint8_t addr[1] = { DS1374_RTC_COUNTER };
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uint8_t secs[4];
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struct iic_msg msgs[2] = {
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{ sc->sc_addr, IIC_M_WR, 1, addr },
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{ sc->sc_addr, IIC_M_RD, 4, secs },
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};
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int error;
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error = iicbus_transfer(dev, msgs, 2);
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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 = 0;
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}
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return error;
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}
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static device_method_t ds1374u_methods[] = {
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DEVMETHOD(device_probe, ds1374u_probe),
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DEVMETHOD(device_attach, ds1374u_attach),
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DEVMETHOD(clock_gettime, ds1374u_gettime),
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DEVMETHOD(clock_settime, ds1374u_settime),
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{0, 0},
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};
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static driver_t ds1374u_driver = {
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"ds1374u",
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ds1374u_methods,
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sizeof(struct ds1374u_softc),
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};
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static devclass_t ds1374u_devclass;
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DRIVER_MODULE(ds1374u, iicbus, ds1374u_driver, ds1374u_devclass, 0, 0);
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MODULE_VERSION(ds1374u, 1);
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MODULE_DEPEND(ds1374u, iicbus, 1, 1, 1);
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