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freebsd/sys/dev/ppbus/pcfclock.c
Bernd Walter 338cad62ab This makes ppbus childs like lpt and ppi succesfully connect to more
than just the first ppbus.
The child drivers always tried to attach unit 0.

Reviewed by:	gallatin
Approved by:	gallatin
2002-04-07 22:06:20 +00:00

343 lines
7.6 KiB
C

/*
* 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.
*
* $FreeBSD$
*
*/
#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/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 {
int count;
};
#define DEVTOSOFTC(dev) \
((struct pcfclock_data *)device_get_softc(dev))
#define UNITOSOFTC(unit) \
((struct pcfclock_data *)devclass_get_softc(pcfclock_devclass, (unit)))
#define UNITODEVICE(unit) \
(devclass_get_device(pcfclock_devclass, (unit)))
static devclass_t pcfclock_devclass;
static d_open_t pcfclock_open;
static d_close_t pcfclock_close;
static d_read_t pcfclock_read;
#define CDEV_MAJOR 140
static struct cdevsw pcfclock_cdevsw = {
/* open */ pcfclock_open,
/* close */ pcfclock_close,
/* read */ pcfclock_read,
/* write */ nowrite,
/* ioctl */ noioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ PCFCLOCK_NAME,
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
};
#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)
{
BUS_ADD_CHILD(parent, 0, PCFCLOCK_NAME, -1);
}
static int
pcfclock_probe(device_t dev)
{
struct pcfclock_data *sc;
device_set_desc(dev, "PCF-1.0");
sc = DEVTOSOFTC(dev);
bzero(sc, sizeof(struct pcfclock_data));
return (0);
}
static int
pcfclock_attach(device_t dev)
{
int unit;
unit = device_get_unit(dev);
make_dev(&pcfclock_cdevsw, unit,
UID_ROOT, GID_WHEEL, 0444, PCFCLOCK_NAME "%d", unit);
return (0);
}
static int
pcfclock_open(dev_t dev, int flag, int fms, struct thread *td)
{
u_int unit = minor(dev);
struct pcfclock_data *sc = UNITOSOFTC(unit);
device_t pcfclockdev = UNITODEVICE(unit);
device_t ppbus = device_get_parent(pcfclockdev);
int res;
if (!sc)
return (ENXIO);
if ((res = ppb_request_bus(ppbus, pcfclockdev,
(flag & O_NONBLOCK) ? PPB_DONTWAIT : PPB_WAIT)))
return (res);
sc->count++;
return (0);
}
static int
pcfclock_close(dev_t dev, int flags, int fmt, struct thread *td)
{
u_int unit = minor(dev);
struct pcfclock_data *sc = UNITOSOFTC(unit);
device_t pcfclockdev = UNITODEVICE(unit);
device_t ppbus = device_get_parent(pcfclockdev);
sc->count--;
if (sc->count == 0)
ppb_release_bus(ppbus, pcfclockdev);
return (0);
}
static void
pcfclock_write_cmd(dev_t dev, unsigned char command)
{
u_int unit = minor(dev);
device_t ppidev = UNITODEVICE(unit);
device_t ppbus = device_get_parent(ppidev);
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(dev_t dev, char buf[18])
{
u_int unit = minor(dev);
#ifdef PCFCLOCK_VERBOSE
int year;
year = NR(buf, 14);
if (year < 70)
year += 100;
printf(PCFCLOCK_NAME "%d: %02d.%02d.%4d %02d:%02d:%02d, "
"battery status: %s\n",
unit,
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))
printf(PCFCLOCK_NAME "%d: BATTERY STATUS LOW ON\n",
unit);
#endif
}
static int
pcfclock_read_data(dev_t dev, char *buf, ssize_t bits)
{
u_int unit = minor(dev);
device_t ppidev = UNITODEVICE(unit);
device_t ppbus = device_get_parent(ppidev);
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(dev_t dev, char *buf, int maxretries)
{
u_int unit = minor(dev);
device_t ppidev = UNITODEVICE(unit);
device_t ppbus = device_get_parent(ppidev);
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 ssize_t
pcfclock_read(dev_t dev, struct uio *uio, int ioflag)
{
u_int unit = minor(dev);
char buf[18];
int error = 0;
if (uio->uio_resid < 18)
return (ERANGE);
error = pcfclock_read_dev(dev, buf, PCFCLOCK_MAX_RETRIES);
if (error) {
printf(PCFCLOCK_NAME "%d: no PCF found\n", unit);
} 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, pcfclock_devclass, 0, 0);