2 * Copyright (c) 2000 Sascha Schumann. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY SASCHA SCHUMANN ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
16 * EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
18 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
19 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
20 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
21 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
22 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 * $FreeBSD: src/sys/dev/ppbus/pcfclock.c,v 1.3.2.1 2000/05/24 00:20:57 n_hibma Exp $
25 * $DragonFly: src/sys/dev/misc/pcfclock/pcfclock.c,v 1.8 2005/10/28 03:25:48 dillon Exp $
29 #include "opt_pcfclock.h"
31 #include <sys/param.h>
32 #include <sys/systm.h>
34 #include <sys/sockio.h>
36 #include <sys/kernel.h>
38 #include <sys/fcntl.h>
41 #include <machine/bus.h>
42 #include <machine/resource.h>
43 #include <machine/clock.h> /* for DELAY */
45 #include <bus/ppbus/ppbconf.h>
46 #include <bus/ppbus/ppb_msq.h>
47 #include <bus/ppbus/ppbio.h>
51 #define PCFCLOCK_NAME "pcfclock"
53 struct pcfclock_data {
55 struct ppb_device pcfclock_dev;
58 #define DEVTOSOFTC(dev) \
59 ((struct pcfclock_data *)device_get_softc(dev))
60 #define UNITOSOFTC(unit) \
61 ((struct pcfclock_data *)devclass_get_softc(pcfclock_devclass, (unit)))
62 #define UNITODEVICE(unit) \
63 (devclass_get_device(pcfclock_devclass, (unit)))
65 static devclass_t pcfclock_devclass;
67 static d_open_t pcfclock_open;
68 static d_close_t pcfclock_close;
69 static d_read_t pcfclock_read;
71 #define CDEV_MAJOR 140
72 static struct cdevsw pcfclock_cdevsw = {
73 /* name */ PCFCLOCK_NAME,
79 /* open */ pcfclock_open,
80 /* close */ pcfclock_close,
81 /* read */ pcfclock_read,
86 /* strategy */ nostrategy,
91 #ifndef PCFCLOCK_MAX_RETRIES
92 #define PCFCLOCK_MAX_RETRIES 10
96 #define AFC_LO AUTOFEED
98 /* AUTO FEED is used as clock */
99 #define AUTOFEED_CLOCK(val) \
100 ctr = (ctr & ~(AUTOFEED)) ^ (val); ppb_wctr(ppbus, ctr)
102 /* SLCT is used as clock */
104 ((ppb_rstr(ppbus) & SELECT) == (i & 1 ? SELECT : 0))
106 /* PE is used as data */
107 #define BIT_SET (ppb_rstr(ppbus)&PERROR)
109 /* the first byte sent as reply must be 00001001b */
110 #define PCFCLOCK_CORRECT_SYNC(buf) (buf[0] == 9)
112 #define NR(buf, off) (buf[off+1]*10+buf[off])
114 /* check for correct input values */
115 #define PCFCLOCK_CORRECT_FORMAT(buf) (\
116 NR(buf, 14) <= 99 && \
117 NR(buf, 12) <= 12 && \
118 NR(buf, 10) <= 31 && \
119 NR(buf, 6) <= 23 && \
120 NR(buf, 4) <= 59 && \
123 #define PCFCLOCK_BATTERY_STATUS_LOW(buf) (buf[8] & 4)
125 #define PCFCLOCK_CMD_TIME 0 /* send current time */
126 #define PCFCLOCK_CMD_COPY 7 /* copy received signal to PC */
129 pcfclock_probe(device_t dev)
131 struct pcfclock_data *sc;
133 device_set_desc(dev, "PCF-1.0");
135 sc = DEVTOSOFTC(dev);
136 bzero(sc, sizeof(struct pcfclock_data));
142 pcfclock_attach(device_t dev)
146 unit = device_get_unit(dev);
148 cdevsw_add(&pcfclock_cdevsw, -1, unit);
149 make_dev(&pcfclock_cdevsw, unit,
150 UID_ROOT, GID_WHEEL, 0444, PCFCLOCK_NAME "%d", unit);
156 pcfclock_open(dev_t dev, int flag, int fms, struct thread *td)
158 u_int unit = minor(dev);
159 struct pcfclock_data *sc = UNITOSOFTC(unit);
160 device_t pcfclockdev = UNITODEVICE(unit);
161 device_t ppbus = device_get_parent(pcfclockdev);
167 if ((res = ppb_request_bus(ppbus, pcfclockdev,
168 (flag & O_NONBLOCK) ? PPB_DONTWAIT : PPB_WAIT)))
177 pcfclock_close(dev_t dev, int flags, int fmt, struct thread *td)
179 u_int unit = minor(dev);
180 struct pcfclock_data *sc = UNITOSOFTC(unit);
181 device_t pcfclockdev = UNITODEVICE(unit);
182 device_t ppbus = device_get_parent(pcfclockdev);
185 if (sc->count == 0) {
186 ppb_release_bus(ppbus, pcfclockdev);
193 pcfclock_write_cmd(dev_t dev, unsigned char command)
195 u_int unit = minor(dev);
196 device_t ppidev = UNITODEVICE(unit);
197 device_t ppbus = device_get_parent(ppidev);
198 unsigned char ctr = 14;
201 for (i = 0; i <= 7; i++) {
203 AUTOFEED_CLOCK(i & 1 ? AFC_HI : AFC_LO);
206 ppb_wdtr(ppbus, command);
207 AUTOFEED_CLOCK(AFC_LO);
209 AUTOFEED_CLOCK(AFC_HI);
213 pcfclock_display_data(dev_t dev, char buf[18])
215 u_int unit = minor(dev);
216 #ifdef PCFCLOCK_VERBOSE
222 printf(PCFCLOCK_NAME "%d: %02d.%02d.%4d %02d:%02d:%02d, "
223 "battery status: %s\n",
225 NR(buf, 10), NR(buf, 12), 1900 + year,
226 NR(buf, 6), NR(buf, 4), NR(buf, 2),
227 PCFCLOCK_BATTERY_STATUS_LOW(buf) ? "LOW" : "ok");
229 if (PCFCLOCK_BATTERY_STATUS_LOW(buf))
230 printf(PCFCLOCK_NAME "%d: BATTERY STATUS LOW ON\n",
236 pcfclock_read_data(dev_t dev, char *buf, ssize_t bits)
238 u_int unit = minor(dev);
239 device_t ppidev = UNITODEVICE(unit);
240 device_t ppbus = device_get_parent(ppidev);
245 /* one byte per four bits */
246 bzero(buf, ((bits + 3) >> 2) + 1);
249 for (i = 0; i <= bits; i++) {
250 /* wait for clock, maximum (waitfor*100) usec */
251 while(!CLOCK_OK && --waitfor > 0)
258 waitfor = 100; /* reload */
260 /* give it some time */
263 /* calculate offset into buffer */
275 pcfclock_read_dev(dev_t dev, char *buf, int maxretries)
277 u_int unit = minor(dev);
278 device_t ppidev = UNITODEVICE(unit);
279 device_t ppbus = device_get_parent(ppidev);
282 ppb_set_mode(ppbus, PPB_COMPATIBLE);
284 while (--maxretries > 0) {
285 pcfclock_write_cmd(dev, PCFCLOCK_CMD_TIME);
286 if (pcfclock_read_data(dev, buf, 68))
289 if (!PCFCLOCK_CORRECT_SYNC(buf))
292 if (!PCFCLOCK_CORRECT_FORMAT(buf))
305 pcfclock_read(dev_t dev, struct uio *uio, int ioflag)
307 u_int unit = minor(dev);
311 if (uio->uio_resid < 18)
314 error = pcfclock_read_dev(dev, buf, PCFCLOCK_MAX_RETRIES);
317 printf(PCFCLOCK_NAME "%d: no PCF found\n", unit);
319 pcfclock_display_data(dev, buf);
321 uiomove(buf, 18, uio);
328 * Because pcfclock is a static device that always exists under any
329 * attached ppbus, and not scanned by the ppbus, we need an identify function
330 * to create the device.
332 static device_method_t pcfclock_methods[] = {
333 /* device interface */
334 DEVMETHOD(device_identify, bus_generic_identify),
335 DEVMETHOD(device_probe, pcfclock_probe),
336 DEVMETHOD(device_attach, pcfclock_attach),
341 static driver_t pcfclock_driver = {
344 sizeof(struct pcfclock_data),
347 DRIVER_MODULE(pcfclock, ppbus, pcfclock_driver, pcfclock_devclass, 0, 0);