336 lines
7.5 KiB
C
336 lines
7.5 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2000 Sascha Schumann. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY SASCHA SCHUMANN ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
|
|
* EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
|
|
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
|
|
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_pcfclock.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/uio.h>
|
|
|
|
#include <machine/bus.h>
|
|
#include <machine/resource.h>
|
|
|
|
#include <dev/ppbus/ppbconf.h>
|
|
#include <dev/ppbus/ppb_msq.h>
|
|
#include <dev/ppbus/ppbio.h>
|
|
|
|
#include "ppbus_if.h"
|
|
|
|
#define PCFCLOCK_NAME "pcfclock"
|
|
|
|
struct pcfclock_data {
|
|
device_t dev;
|
|
struct cdev *cdev;
|
|
};
|
|
|
|
static d_open_t pcfclock_open;
|
|
static d_close_t pcfclock_close;
|
|
static d_read_t pcfclock_read;
|
|
|
|
static struct cdevsw pcfclock_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_open = pcfclock_open,
|
|
.d_close = pcfclock_close,
|
|
.d_read = pcfclock_read,
|
|
.d_name = PCFCLOCK_NAME,
|
|
};
|
|
|
|
#ifndef PCFCLOCK_MAX_RETRIES
|
|
#define PCFCLOCK_MAX_RETRIES 10
|
|
#endif
|
|
|
|
#define AFC_HI 0
|
|
#define AFC_LO AUTOFEED
|
|
|
|
/* AUTO FEED is used as clock */
|
|
#define AUTOFEED_CLOCK(val) \
|
|
ctr = (ctr & ~(AUTOFEED)) ^ (val); ppb_wctr(ppbus, ctr)
|
|
|
|
/* SLCT is used as clock */
|
|
#define CLOCK_OK \
|
|
((ppb_rstr(ppbus) & SELECT) == (i & 1 ? SELECT : 0))
|
|
|
|
/* PE is used as data */
|
|
#define BIT_SET (ppb_rstr(ppbus)&PERROR)
|
|
|
|
/* the first byte sent as reply must be 00001001b */
|
|
#define PCFCLOCK_CORRECT_SYNC(buf) (buf[0] == 9)
|
|
|
|
#define NR(buf, off) (buf[off+1]*10+buf[off])
|
|
|
|
/* check for correct input values */
|
|
#define PCFCLOCK_CORRECT_FORMAT(buf) (\
|
|
NR(buf, 14) <= 99 && \
|
|
NR(buf, 12) <= 12 && \
|
|
NR(buf, 10) <= 31 && \
|
|
NR(buf, 6) <= 23 && \
|
|
NR(buf, 4) <= 59 && \
|
|
NR(buf, 2) <= 59)
|
|
|
|
#define PCFCLOCK_BATTERY_STATUS_LOW(buf) (buf[8] & 4)
|
|
|
|
#define PCFCLOCK_CMD_TIME 0 /* send current time */
|
|
#define PCFCLOCK_CMD_COPY 7 /* copy received signal to PC */
|
|
|
|
static void
|
|
pcfclock_identify(driver_t *driver, device_t parent)
|
|
{
|
|
|
|
device_t dev;
|
|
|
|
dev = device_find_child(parent, PCFCLOCK_NAME, -1);
|
|
if (!dev)
|
|
BUS_ADD_CHILD(parent, 0, PCFCLOCK_NAME, -1);
|
|
}
|
|
|
|
static int
|
|
pcfclock_probe(device_t dev)
|
|
{
|
|
|
|
device_set_desc(dev, "PCF-1.0");
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pcfclock_attach(device_t dev)
|
|
{
|
|
struct pcfclock_data *sc = device_get_softc(dev);
|
|
int unit;
|
|
|
|
unit = device_get_unit(dev);
|
|
|
|
sc->dev = dev;
|
|
sc->cdev = make_dev(&pcfclock_cdevsw, unit,
|
|
UID_ROOT, GID_WHEEL, 0400, PCFCLOCK_NAME "%d", unit);
|
|
if (sc->cdev == NULL) {
|
|
device_printf(dev, "Failed to create character device\n");
|
|
return (ENXIO);
|
|
}
|
|
sc->cdev->si_drv1 = sc;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pcfclock_open(struct cdev *dev, int flag, int fms, struct thread *td)
|
|
{
|
|
struct pcfclock_data *sc = dev->si_drv1;
|
|
device_t pcfclockdev;
|
|
device_t ppbus;
|
|
int res;
|
|
|
|
if (!sc)
|
|
return (ENXIO);
|
|
pcfclockdev = sc->dev;
|
|
ppbus = device_get_parent(pcfclockdev);
|
|
|
|
ppb_lock(ppbus);
|
|
res = ppb_request_bus(ppbus, pcfclockdev,
|
|
(flag & O_NONBLOCK) ? PPB_DONTWAIT : PPB_WAIT);
|
|
ppb_unlock(ppbus);
|
|
return (res);
|
|
}
|
|
|
|
static int
|
|
pcfclock_close(struct cdev *dev, int flags, int fmt, struct thread *td)
|
|
{
|
|
struct pcfclock_data *sc = dev->si_drv1;
|
|
device_t pcfclockdev = sc->dev;
|
|
device_t ppbus = device_get_parent(pcfclockdev);
|
|
|
|
ppb_lock(ppbus);
|
|
ppb_release_bus(ppbus, pcfclockdev);
|
|
ppb_unlock(ppbus);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
pcfclock_write_cmd(struct cdev *dev, unsigned char command)
|
|
{
|
|
struct pcfclock_data *sc = dev->si_drv1;
|
|
device_t pcfclockdev = sc->dev;
|
|
device_t ppbus = device_get_parent(pcfclockdev);
|
|
unsigned char ctr = 14;
|
|
char i;
|
|
|
|
for (i = 0; i <= 7; i++) {
|
|
ppb_wdtr(ppbus, i);
|
|
AUTOFEED_CLOCK(i & 1 ? AFC_HI : AFC_LO);
|
|
DELAY(3000);
|
|
}
|
|
ppb_wdtr(ppbus, command);
|
|
AUTOFEED_CLOCK(AFC_LO);
|
|
DELAY(3000);
|
|
AUTOFEED_CLOCK(AFC_HI);
|
|
}
|
|
|
|
static void
|
|
pcfclock_display_data(struct cdev *dev, char buf[18])
|
|
{
|
|
struct pcfclock_data *sc = dev->si_drv1;
|
|
#ifdef PCFCLOCK_VERBOSE
|
|
int year;
|
|
|
|
year = NR(buf, 14);
|
|
if (year < 70)
|
|
year += 100;
|
|
|
|
device_printf(sc->dev, "%02d.%02d.%4d %02d:%02d:%02d, "
|
|
"battery status: %s\n",
|
|
NR(buf, 10), NR(buf, 12), 1900 + year,
|
|
NR(buf, 6), NR(buf, 4), NR(buf, 2),
|
|
PCFCLOCK_BATTERY_STATUS_LOW(buf) ? "LOW" : "ok");
|
|
#else
|
|
if (PCFCLOCK_BATTERY_STATUS_LOW(buf))
|
|
device_printf(sc->dev, "BATTERY STATUS LOW ON\n");
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
pcfclock_read_data(struct cdev *dev, char *buf, ssize_t bits)
|
|
{
|
|
struct pcfclock_data *sc = dev->si_drv1;
|
|
device_t pcfclockdev = sc->dev;
|
|
device_t ppbus = device_get_parent(pcfclockdev);
|
|
int i;
|
|
char waitfor;
|
|
int offset;
|
|
|
|
/* one byte per four bits */
|
|
bzero(buf, ((bits + 3) >> 2) + 1);
|
|
|
|
waitfor = 100;
|
|
for (i = 0; i <= bits; i++) {
|
|
/* wait for clock, maximum (waitfor*100) usec */
|
|
while (!CLOCK_OK && --waitfor > 0)
|
|
DELAY(100);
|
|
|
|
/* timed out? */
|
|
if (!waitfor)
|
|
return (EIO);
|
|
|
|
waitfor = 100; /* reload */
|
|
|
|
/* give it some time */
|
|
DELAY(500);
|
|
|
|
/* calculate offset into buffer */
|
|
offset = i >> 2;
|
|
buf[offset] <<= 1;
|
|
|
|
if (BIT_SET)
|
|
buf[offset] |= 1;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pcfclock_read_dev(struct cdev *dev, char *buf, int maxretries)
|
|
{
|
|
struct pcfclock_data *sc = dev->si_drv1;
|
|
device_t pcfclockdev = sc->dev;
|
|
device_t ppbus = device_get_parent(pcfclockdev);
|
|
int error = 0;
|
|
|
|
ppb_set_mode(ppbus, PPB_COMPATIBLE);
|
|
|
|
while (--maxretries > 0) {
|
|
pcfclock_write_cmd(dev, PCFCLOCK_CMD_TIME);
|
|
if (pcfclock_read_data(dev, buf, 68))
|
|
continue;
|
|
|
|
if (!PCFCLOCK_CORRECT_SYNC(buf))
|
|
continue;
|
|
|
|
if (!PCFCLOCK_CORRECT_FORMAT(buf))
|
|
continue;
|
|
|
|
break;
|
|
}
|
|
|
|
if (!maxretries)
|
|
error = EIO;
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
pcfclock_read(struct cdev *dev, struct uio *uio, int ioflag)
|
|
{
|
|
struct pcfclock_data *sc = dev->si_drv1;
|
|
device_t ppbus;
|
|
char buf[18];
|
|
int error = 0;
|
|
|
|
if (uio->uio_resid < 18)
|
|
return (ERANGE);
|
|
|
|
ppbus = device_get_parent(sc->dev);
|
|
ppb_lock(ppbus);
|
|
error = pcfclock_read_dev(dev, buf, PCFCLOCK_MAX_RETRIES);
|
|
ppb_unlock(ppbus);
|
|
|
|
if (error) {
|
|
device_printf(sc->dev, "no PCF found\n");
|
|
} else {
|
|
pcfclock_display_data(dev, buf);
|
|
|
|
uiomove(buf, 18, uio);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static device_method_t pcfclock_methods[] = {
|
|
/* device interface */
|
|
DEVMETHOD(device_identify, pcfclock_identify),
|
|
DEVMETHOD(device_probe, pcfclock_probe),
|
|
DEVMETHOD(device_attach, pcfclock_attach),
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t pcfclock_driver = {
|
|
PCFCLOCK_NAME,
|
|
pcfclock_methods,
|
|
sizeof(struct pcfclock_data),
|
|
};
|
|
|
|
DRIVER_MODULE(pcfclock, ppbus, pcfclock_driver, 0, 0);
|