334 lines
7.5 KiB
C
334 lines
7.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2000 Sascha Schumann. 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 SASCHA SCHUMANN ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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*/
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#include <sys/cdefs.h>
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#include "opt_pcfclock.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/sockio.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/uio.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <dev/ppbus/ppbconf.h>
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#include <dev/ppbus/ppb_msq.h>
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#include <dev/ppbus/ppbio.h>
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#include "ppbus_if.h"
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#define PCFCLOCK_NAME "pcfclock"
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struct pcfclock_data {
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device_t dev;
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struct cdev *cdev;
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};
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static d_open_t pcfclock_open;
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static d_close_t pcfclock_close;
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static d_read_t pcfclock_read;
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static struct cdevsw pcfclock_cdevsw = {
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.d_version = D_VERSION,
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.d_open = pcfclock_open,
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.d_close = pcfclock_close,
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.d_read = pcfclock_read,
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.d_name = PCFCLOCK_NAME,
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};
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#ifndef PCFCLOCK_MAX_RETRIES
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#define PCFCLOCK_MAX_RETRIES 10
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#endif
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#define AFC_HI 0
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#define AFC_LO AUTOFEED
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/* AUTO FEED is used as clock */
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#define AUTOFEED_CLOCK(val) \
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ctr = (ctr & ~(AUTOFEED)) ^ (val); ppb_wctr(ppbus, ctr)
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/* SLCT is used as clock */
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#define CLOCK_OK \
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((ppb_rstr(ppbus) & SELECT) == (i & 1 ? SELECT : 0))
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/* PE is used as data */
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#define BIT_SET (ppb_rstr(ppbus)&PERROR)
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/* the first byte sent as reply must be 00001001b */
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#define PCFCLOCK_CORRECT_SYNC(buf) (buf[0] == 9)
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#define NR(buf, off) (buf[off+1]*10+buf[off])
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/* check for correct input values */
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#define PCFCLOCK_CORRECT_FORMAT(buf) (\
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NR(buf, 14) <= 99 && \
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NR(buf, 12) <= 12 && \
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NR(buf, 10) <= 31 && \
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NR(buf, 6) <= 23 && \
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NR(buf, 4) <= 59 && \
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NR(buf, 2) <= 59)
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#define PCFCLOCK_BATTERY_STATUS_LOW(buf) (buf[8] & 4)
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#define PCFCLOCK_CMD_TIME 0 /* send current time */
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#define PCFCLOCK_CMD_COPY 7 /* copy received signal to PC */
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static void
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pcfclock_identify(driver_t *driver, device_t parent)
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{
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device_t dev;
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dev = device_find_child(parent, PCFCLOCK_NAME, -1);
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if (!dev)
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BUS_ADD_CHILD(parent, 0, PCFCLOCK_NAME, -1);
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}
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static int
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pcfclock_probe(device_t dev)
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{
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device_set_desc(dev, "PCF-1.0");
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return (0);
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}
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static int
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pcfclock_attach(device_t dev)
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{
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struct pcfclock_data *sc = device_get_softc(dev);
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int unit;
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unit = device_get_unit(dev);
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sc->dev = dev;
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sc->cdev = make_dev(&pcfclock_cdevsw, unit,
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UID_ROOT, GID_WHEEL, 0400, PCFCLOCK_NAME "%d", unit);
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if (sc->cdev == NULL) {
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device_printf(dev, "Failed to create character device\n");
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return (ENXIO);
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}
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sc->cdev->si_drv1 = sc;
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return (0);
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}
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static int
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pcfclock_open(struct cdev *dev, int flag, int fms, struct thread *td)
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{
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struct pcfclock_data *sc = dev->si_drv1;
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device_t pcfclockdev;
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device_t ppbus;
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int res;
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if (!sc)
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return (ENXIO);
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pcfclockdev = sc->dev;
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ppbus = device_get_parent(pcfclockdev);
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ppb_lock(ppbus);
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res = ppb_request_bus(ppbus, pcfclockdev,
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(flag & O_NONBLOCK) ? PPB_DONTWAIT : PPB_WAIT);
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ppb_unlock(ppbus);
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return (res);
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}
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static int
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pcfclock_close(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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struct pcfclock_data *sc = dev->si_drv1;
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device_t pcfclockdev = sc->dev;
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device_t ppbus = device_get_parent(pcfclockdev);
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ppb_lock(ppbus);
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ppb_release_bus(ppbus, pcfclockdev);
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ppb_unlock(ppbus);
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return (0);
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}
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static void
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pcfclock_write_cmd(struct cdev *dev, unsigned char command)
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{
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struct pcfclock_data *sc = dev->si_drv1;
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device_t pcfclockdev = sc->dev;
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device_t ppbus = device_get_parent(pcfclockdev);
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unsigned char ctr = 14;
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char i;
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for (i = 0; i <= 7; i++) {
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ppb_wdtr(ppbus, i);
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AUTOFEED_CLOCK(i & 1 ? AFC_HI : AFC_LO);
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DELAY(3000);
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}
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ppb_wdtr(ppbus, command);
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AUTOFEED_CLOCK(AFC_LO);
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DELAY(3000);
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AUTOFEED_CLOCK(AFC_HI);
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}
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static void
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pcfclock_display_data(struct cdev *dev, char buf[18])
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{
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struct pcfclock_data *sc = dev->si_drv1;
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#ifdef PCFCLOCK_VERBOSE
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int year;
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year = NR(buf, 14);
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if (year < 70)
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year += 100;
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device_printf(sc->dev, "%02d.%02d.%4d %02d:%02d:%02d, "
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"battery status: %s\n",
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NR(buf, 10), NR(buf, 12), 1900 + year,
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NR(buf, 6), NR(buf, 4), NR(buf, 2),
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PCFCLOCK_BATTERY_STATUS_LOW(buf) ? "LOW" : "ok");
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#else
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if (PCFCLOCK_BATTERY_STATUS_LOW(buf))
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device_printf(sc->dev, "BATTERY STATUS LOW ON\n");
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#endif
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}
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static int
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pcfclock_read_data(struct cdev *dev, char *buf, ssize_t bits)
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{
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struct pcfclock_data *sc = dev->si_drv1;
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device_t pcfclockdev = sc->dev;
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device_t ppbus = device_get_parent(pcfclockdev);
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int i;
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char waitfor;
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int offset;
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/* one byte per four bits */
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bzero(buf, ((bits + 3) >> 2) + 1);
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waitfor = 100;
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for (i = 0; i <= bits; i++) {
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/* wait for clock, maximum (waitfor*100) usec */
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while (!CLOCK_OK && --waitfor > 0)
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DELAY(100);
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/* timed out? */
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if (!waitfor)
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return (EIO);
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waitfor = 100; /* reload */
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/* give it some time */
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DELAY(500);
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/* calculate offset into buffer */
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offset = i >> 2;
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buf[offset] <<= 1;
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if (BIT_SET)
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buf[offset] |= 1;
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}
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return (0);
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}
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static int
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pcfclock_read_dev(struct cdev *dev, char *buf, int maxretries)
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{
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struct pcfclock_data *sc = dev->si_drv1;
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device_t pcfclockdev = sc->dev;
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device_t ppbus = device_get_parent(pcfclockdev);
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int error = 0;
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ppb_set_mode(ppbus, PPB_COMPATIBLE);
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while (--maxretries > 0) {
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pcfclock_write_cmd(dev, PCFCLOCK_CMD_TIME);
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if (pcfclock_read_data(dev, buf, 68))
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continue;
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if (!PCFCLOCK_CORRECT_SYNC(buf))
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continue;
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if (!PCFCLOCK_CORRECT_FORMAT(buf))
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continue;
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break;
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}
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if (!maxretries)
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error = EIO;
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return (error);
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}
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static int
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pcfclock_read(struct cdev *dev, struct uio *uio, int ioflag)
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{
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struct pcfclock_data *sc = dev->si_drv1;
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device_t ppbus;
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char buf[18];
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int error = 0;
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if (uio->uio_resid < 18)
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return (ERANGE);
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ppbus = device_get_parent(sc->dev);
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ppb_lock(ppbus);
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error = pcfclock_read_dev(dev, buf, PCFCLOCK_MAX_RETRIES);
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ppb_unlock(ppbus);
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if (error) {
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device_printf(sc->dev, "no PCF found\n");
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} else {
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pcfclock_display_data(dev, buf);
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uiomove(buf, 18, uio);
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}
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return (error);
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}
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static device_method_t pcfclock_methods[] = {
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/* device interface */
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DEVMETHOD(device_identify, pcfclock_identify),
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DEVMETHOD(device_probe, pcfclock_probe),
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DEVMETHOD(device_attach, pcfclock_attach),
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{ 0, 0 }
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};
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static driver_t pcfclock_driver = {
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PCFCLOCK_NAME,
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pcfclock_methods,
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sizeof(struct pcfclock_data),
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};
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DRIVER_MODULE(pcfclock, ppbus, pcfclock_driver, 0, 0);
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