xref: /dragonfly/sys/dev/misc/pcfclock/pcfclock.c (revision 0db87cb7)
1 /*
2  * Copyright (c) 2000 Sascha Schumann. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
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.
12  *
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.
23  *
24  * $FreeBSD: src/sys/dev/ppbus/pcfclock.c,v 1.3.2.1 2000/05/24 00:20:57 n_hibma Exp $
25  *
26  */
27 
28 #include "opt_pcfclock.h"
29 
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bus.h>
33 #include <sys/conf.h>
34 #include <sys/device.h>
35 #include <sys/sockio.h>
36 #include <sys/mbuf.h>
37 #include <sys/kernel.h>
38 #include <sys/fcntl.h>
39 #include <sys/uio.h>
40 
41 #include <machine/clock.h>      /* for DELAY */
42 
43 #include <bus/ppbus/ppbconf.h>
44 #include <bus/ppbus/ppb_msq.h>
45 #include <bus/ppbus/ppbio.h>
46 
47 #include "ppbus_if.h"
48 
49 #define PCFCLOCK_NAME "pcfclock"
50 
51 struct pcfclock_data {
52 	int	count;
53 	struct	ppb_device pcfclock_dev;
54 };
55 
56 #define DEVTOSOFTC(dev) \
57 	((struct pcfclock_data *)device_get_softc(dev))
58 #define UNITOSOFTC(unit) \
59 	((struct pcfclock_data *)devclass_get_softc(pcfclock_devclass, (unit)))
60 #define UNITODEVICE(unit) \
61 	(devclass_get_device(pcfclock_devclass, (unit)))
62 
63 static devclass_t pcfclock_devclass;
64 
65 static	d_open_t		pcfclock_open;
66 static	d_close_t		pcfclock_close;
67 static	d_read_t		pcfclock_read;
68 
69 static struct dev_ops pcfclock_ops = {
70 	{ PCFCLOCK_NAME, 0, 0 },
71 	.d_open =	pcfclock_open,
72 	.d_close =	pcfclock_close,
73 	.d_read =	pcfclock_read,
74 };
75 
76 #ifndef PCFCLOCK_MAX_RETRIES
77 #define PCFCLOCK_MAX_RETRIES 10
78 #endif
79 
80 #define AFC_HI 0
81 #define AFC_LO AUTOFEED
82 
83 /* AUTO FEED is used as clock */
84 #define AUTOFEED_CLOCK(val) \
85 	ctr = (ctr & ~(AUTOFEED)) ^ (val); ppb_wctr(ppbus, ctr)
86 
87 /* SLCT is used as clock */
88 #define CLOCK_OK \
89 	((ppb_rstr(ppbus) & SELECT) == (i & 1 ? SELECT : 0))
90 
91 /* PE is used as data */
92 #define BIT_SET (ppb_rstr(ppbus)&PERROR)
93 
94 /* the first byte sent as reply must be 00001001b */
95 #define PCFCLOCK_CORRECT_SYNC(buf) (buf[0] == 9)
96 
97 #define NR(buf, off) (buf[off+1]*10+buf[off])
98 
99 /* check for correct input values */
100 #define PCFCLOCK_CORRECT_FORMAT(buf) (\
101 	NR(buf, 14) <= 99 && \
102 	NR(buf, 12) <= 12 && \
103 	NR(buf, 10) <= 31 && \
104 	NR(buf,  6) <= 23 && \
105 	NR(buf,  4) <= 59 && \
106 	NR(buf,  2) <= 59)
107 
108 #define PCFCLOCK_BATTERY_STATUS_LOW(buf) (buf[8] & 4)
109 
110 #define PCFCLOCK_CMD_TIME 0		/* send current time */
111 #define PCFCLOCK_CMD_COPY 7 	/* copy received signal to PC */
112 
113 static int
114 pcfclock_probe(device_t dev)
115 {
116 	struct pcfclock_data *sc;
117 
118 	device_set_desc(dev, "PCF-1.0");
119 
120 	sc = DEVTOSOFTC(dev);
121 	bzero(sc, sizeof(struct pcfclock_data));
122 
123 	return (0);
124 }
125 
126 static int
127 pcfclock_attach(device_t dev)
128 {
129 	int unit;
130 
131 	unit = device_get_unit(dev);
132 
133 	make_dev(&pcfclock_ops, unit,
134 		 UID_ROOT, GID_WHEEL, 0444, PCFCLOCK_NAME "%d", unit);
135 
136 	return (0);
137 }
138 
139 static int
140 pcfclock_open(struct dev_open_args *ap)
141 {
142 	cdev_t dev = ap->a_head.a_dev;
143 	u_int unit = minor(dev);
144 	struct pcfclock_data *sc = UNITOSOFTC(unit);
145 	device_t pcfclockdev = UNITODEVICE(unit);
146 	device_t ppbus = device_get_parent(pcfclockdev);
147 	int res;
148 
149 	if (!sc)
150 		return (ENXIO);
151 
152 	if ((res = ppb_request_bus(ppbus, pcfclockdev,
153 		(ap->a_oflags & O_NONBLOCK) ? PPB_DONTWAIT : PPB_WAIT)))
154 		return (res);
155 
156 	sc->count++;
157 
158 	return (0);
159 }
160 
161 static int
162 pcfclock_close(struct dev_close_args *ap)
163 {
164 	cdev_t dev = ap->a_head.a_dev;
165 	u_int unit = minor(dev);
166 	struct pcfclock_data *sc = UNITOSOFTC(unit);
167 	device_t pcfclockdev = UNITODEVICE(unit);
168 	device_t ppbus = device_get_parent(pcfclockdev);
169 
170 	sc->count--;
171 	if (sc->count == 0) {
172 		ppb_release_bus(ppbus, pcfclockdev);
173 	}
174 
175 	return (0);
176 }
177 
178 static void
179 pcfclock_write_cmd(cdev_t dev, unsigned char command)
180 {
181 	u_int unit = minor(dev);
182 	device_t ppidev = UNITODEVICE(unit);
183         device_t ppbus = device_get_parent(ppidev);
184 	unsigned char ctr = 14;
185 	char i;
186 
187 	for (i = 0; i <= 7; i++) {
188 		ppb_wdtr(ppbus, i);
189 		AUTOFEED_CLOCK(i & 1 ? AFC_HI : AFC_LO);
190 		DELAY(3000);
191 	}
192 	ppb_wdtr(ppbus, command);
193 	AUTOFEED_CLOCK(AFC_LO);
194 	DELAY(3000);
195 	AUTOFEED_CLOCK(AFC_HI);
196 }
197 
198 static void
199 pcfclock_display_data(cdev_t dev, char buf[18])
200 {
201 	u_int unit = minor(dev);
202 #ifdef PCFCLOCK_VERBOSE
203 	int year;
204 
205 	year = NR(buf, 14);
206 	if (year < 70)
207 		year += 100;
208 	kprintf(PCFCLOCK_NAME "%d: %02d.%02d.%4d %02d:%02d:%02d, "
209 			"battery status: %s\n",
210 			unit,
211 			NR(buf, 10), NR(buf, 12), 1900 + year,
212 			NR(buf, 6), NR(buf, 4), NR(buf, 2),
213 			PCFCLOCK_BATTERY_STATUS_LOW(buf) ? "LOW" : "ok");
214 #else
215 	if (PCFCLOCK_BATTERY_STATUS_LOW(buf))
216 		kprintf(PCFCLOCK_NAME "%d: BATTERY STATUS LOW ON\n",
217 				unit);
218 #endif
219 }
220 
221 static int
222 pcfclock_read_data(cdev_t dev, char *buf, ssize_t bits)
223 {
224 	u_int unit = minor(dev);
225 	device_t ppidev = UNITODEVICE(unit);
226         device_t ppbus = device_get_parent(ppidev);
227 	int i;
228 	char waitfor;
229 	int offset;
230 
231 	/* one byte per four bits */
232 	bzero(buf, ((bits + 3) >> 2) + 1);
233 
234 	waitfor = 100;
235 	for (i = 0; i <= bits; i++) {
236 		/* wait for clock, maximum (waitfor*100) usec */
237 		while(!CLOCK_OK && --waitfor > 0)
238 			DELAY(100);
239 
240 		/* timed out? */
241 		if (!waitfor)
242 			return (EIO);
243 
244 		waitfor = 100; /* reload */
245 
246 		/* give it some time */
247 		DELAY(500);
248 
249 		/* calculate offset into buffer */
250 		offset = i >> 2;
251 		buf[offset] <<= 1;
252 
253 		if (BIT_SET)
254 			buf[offset] |= 1;
255 	}
256 
257 	return (0);
258 }
259 
260 static int
261 pcfclock_read_dev(cdev_t dev, char *buf, int maxretries)
262 {
263 	u_int unit = minor(dev);
264 	device_t ppidev = UNITODEVICE(unit);
265         device_t ppbus = device_get_parent(ppidev);
266 	int error = 0;
267 
268 	ppb_set_mode(ppbus, PPB_COMPATIBLE);
269 
270 	while (--maxretries > 0) {
271 		pcfclock_write_cmd(dev, PCFCLOCK_CMD_TIME);
272 		if (pcfclock_read_data(dev, buf, 68))
273 			continue;
274 
275 		if (!PCFCLOCK_CORRECT_SYNC(buf))
276 			continue;
277 
278 		if (!PCFCLOCK_CORRECT_FORMAT(buf))
279 			continue;
280 
281 		break;
282 	}
283 
284 	if (!maxretries)
285 		error = EIO;
286 
287 	return (error);
288 }
289 
290 static int
291 pcfclock_read(struct dev_read_args *ap)
292 {
293 	cdev_t dev = ap->a_head.a_dev;
294 	u_int unit = minor(dev);
295 	char buf[18];
296 	int error = 0;
297 
298 	if (ap->a_uio->uio_resid < 18)
299 		return (ERANGE);
300 
301 	error = pcfclock_read_dev(dev, buf, PCFCLOCK_MAX_RETRIES);
302 
303 	if (error) {
304 		kprintf(PCFCLOCK_NAME "%d: no PCF found\n", unit);
305 	} else {
306 		pcfclock_display_data(dev, buf);
307 
308 		uiomove(buf, 18, ap->a_uio);
309 	}
310 
311 	return (error);
312 }
313 
314 /*
315  * Because pcfclock is a static device that always exists under any
316  * attached ppbus, and not scanned by the ppbus, we need an identify function
317  * to create the device.
318  */
319 static device_method_t pcfclock_methods[] = {
320 	/* device interface */
321 	DEVMETHOD(device_identify,	bus_generic_identify),
322 	DEVMETHOD(device_probe,		pcfclock_probe),
323 	DEVMETHOD(device_attach,	pcfclock_attach),
324 
325 	DEVMETHOD_END
326 };
327 
328 static driver_t pcfclock_driver = {
329 	PCFCLOCK_NAME,
330 	pcfclock_methods,
331 	sizeof(struct pcfclock_data),
332 };
333 
334 DRIVER_MODULE(pcfclock, ppbus, pcfclock_driver, pcfclock_devclass, NULL, NULL);
335 
336