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 AUTHOR 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 * 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_pcfclock.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/sockio.h> 36 #include <sys/mbuf.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/conf.h> 40 #include <sys/fcntl.h> 41 #include <sys/uio.h> 42 43 #include <machine/bus.h> 44 #include <machine/resource.h> 45 46 #include <dev/ppbus/ppbconf.h> 47 #include <dev/ppbus/ppb_msq.h> 48 #include <dev/ppbus/ppbio.h> 49 50 #include "ppbus_if.h" 51 52 #define PCFCLOCK_NAME "pcfclock" 53 54 struct pcfclock_data { 55 int count; 56 }; 57 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))) 64 65 static devclass_t pcfclock_devclass; 66 67 static d_open_t pcfclock_open; 68 static d_close_t pcfclock_close; 69 static d_read_t pcfclock_read; 70 71 static struct cdevsw pcfclock_cdevsw = { 72 .d_version = D_VERSION, 73 .d_flags = D_NEEDGIANT, 74 .d_open = pcfclock_open, 75 .d_close = pcfclock_close, 76 .d_read = pcfclock_read, 77 .d_name = PCFCLOCK_NAME, 78 }; 79 80 #ifndef PCFCLOCK_MAX_RETRIES 81 #define PCFCLOCK_MAX_RETRIES 10 82 #endif 83 84 #define AFC_HI 0 85 #define AFC_LO AUTOFEED 86 87 /* AUTO FEED is used as clock */ 88 #define AUTOFEED_CLOCK(val) \ 89 ctr = (ctr & ~(AUTOFEED)) ^ (val); ppb_wctr(ppbus, ctr) 90 91 /* SLCT is used as clock */ 92 #define CLOCK_OK \ 93 ((ppb_rstr(ppbus) & SELECT) == (i & 1 ? SELECT : 0)) 94 95 /* PE is used as data */ 96 #define BIT_SET (ppb_rstr(ppbus)&PERROR) 97 98 /* the first byte sent as reply must be 00001001b */ 99 #define PCFCLOCK_CORRECT_SYNC(buf) (buf[0] == 9) 100 101 #define NR(buf, off) (buf[off+1]*10+buf[off]) 102 103 /* check for correct input values */ 104 #define PCFCLOCK_CORRECT_FORMAT(buf) (\ 105 NR(buf, 14) <= 99 && \ 106 NR(buf, 12) <= 12 && \ 107 NR(buf, 10) <= 31 && \ 108 NR(buf, 6) <= 23 && \ 109 NR(buf, 4) <= 59 && \ 110 NR(buf, 2) <= 59) 111 112 #define PCFCLOCK_BATTERY_STATUS_LOW(buf) (buf[8] & 4) 113 114 #define PCFCLOCK_CMD_TIME 0 /* send current time */ 115 #define PCFCLOCK_CMD_COPY 7 /* copy received signal to PC */ 116 117 static void 118 pcfclock_identify(driver_t *driver, device_t parent) 119 { 120 121 device_t dev; 122 123 dev = device_find_child(parent, PCFCLOCK_NAME, 0); 124 if (!dev) 125 BUS_ADD_CHILD(parent, 0, PCFCLOCK_NAME, -1); 126 } 127 128 static int 129 pcfclock_probe(device_t dev) 130 { 131 struct pcfclock_data *sc; 132 133 device_set_desc(dev, "PCF-1.0"); 134 135 sc = DEVTOSOFTC(dev); 136 bzero(sc, sizeof(struct pcfclock_data)); 137 138 return (0); 139 } 140 141 static int 142 pcfclock_attach(device_t dev) 143 { 144 int unit; 145 146 unit = device_get_unit(dev); 147 148 make_dev(&pcfclock_cdevsw, unit, 149 UID_ROOT, GID_WHEEL, 0400, PCFCLOCK_NAME "%d", unit); 150 151 return (0); 152 } 153 154 static int 155 pcfclock_open(struct cdev *dev, int flag, int fms, struct thread *td) 156 { 157 u_int unit = minor(dev); 158 struct pcfclock_data *sc = UNITOSOFTC(unit); 159 device_t pcfclockdev = UNITODEVICE(unit); 160 device_t ppbus = device_get_parent(pcfclockdev); 161 int res; 162 163 if (!sc) 164 return (ENXIO); 165 166 if ((res = ppb_request_bus(ppbus, pcfclockdev, 167 (flag & O_NONBLOCK) ? PPB_DONTWAIT : PPB_WAIT))) 168 return (res); 169 170 sc->count++; 171 172 return (0); 173 } 174 175 static int 176 pcfclock_close(struct cdev *dev, int flags, int fmt, struct thread *td) 177 { 178 u_int unit = minor(dev); 179 struct pcfclock_data *sc = UNITOSOFTC(unit); 180 device_t pcfclockdev = UNITODEVICE(unit); 181 device_t ppbus = device_get_parent(pcfclockdev); 182 183 sc->count--; 184 if (sc->count == 0) 185 ppb_release_bus(ppbus, pcfclockdev); 186 187 return (0); 188 } 189 190 static void 191 pcfclock_write_cmd(struct cdev *dev, unsigned char command) 192 { 193 u_int unit = minor(dev); 194 device_t ppidev = UNITODEVICE(unit); 195 device_t ppbus = device_get_parent(ppidev); 196 unsigned char ctr = 14; 197 char i; 198 199 for (i = 0; i <= 7; i++) { 200 ppb_wdtr(ppbus, i); 201 AUTOFEED_CLOCK(i & 1 ? AFC_HI : AFC_LO); 202 DELAY(3000); 203 } 204 ppb_wdtr(ppbus, command); 205 AUTOFEED_CLOCK(AFC_LO); 206 DELAY(3000); 207 AUTOFEED_CLOCK(AFC_HI); 208 } 209 210 static void 211 pcfclock_display_data(struct cdev *dev, char buf[18]) 212 { 213 u_int unit = minor(dev); 214 #ifdef PCFCLOCK_VERBOSE 215 int year; 216 217 year = NR(buf, 14); 218 if (year < 70) 219 year += 100; 220 221 printf(PCFCLOCK_NAME "%d: %02d.%02d.%4d %02d:%02d:%02d, " 222 "battery status: %s\n", 223 unit, 224 NR(buf, 10), NR(buf, 12), 1900 + year, 225 NR(buf, 6), NR(buf, 4), NR(buf, 2), 226 PCFCLOCK_BATTERY_STATUS_LOW(buf) ? "LOW" : "ok"); 227 #else 228 if (PCFCLOCK_BATTERY_STATUS_LOW(buf)) 229 printf(PCFCLOCK_NAME "%d: BATTERY STATUS LOW ON\n", 230 unit); 231 #endif 232 } 233 234 static int 235 pcfclock_read_data(struct cdev *dev, char *buf, ssize_t bits) 236 { 237 u_int unit = minor(dev); 238 device_t ppidev = UNITODEVICE(unit); 239 device_t ppbus = device_get_parent(ppidev); 240 int i; 241 char waitfor; 242 int offset; 243 244 /* one byte per four bits */ 245 bzero(buf, ((bits + 3) >> 2) + 1); 246 247 waitfor = 100; 248 for (i = 0; i <= bits; i++) { 249 /* wait for clock, maximum (waitfor*100) usec */ 250 while(!CLOCK_OK && --waitfor > 0) 251 DELAY(100); 252 253 /* timed out? */ 254 if (!waitfor) 255 return (EIO); 256 257 waitfor = 100; /* reload */ 258 259 /* give it some time */ 260 DELAY(500); 261 262 /* calculate offset into buffer */ 263 offset = i >> 2; 264 buf[offset] <<= 1; 265 266 if (BIT_SET) 267 buf[offset] |= 1; 268 } 269 270 return (0); 271 } 272 273 static int 274 pcfclock_read_dev(struct cdev *dev, char *buf, int maxretries) 275 { 276 u_int unit = minor(dev); 277 device_t ppidev = UNITODEVICE(unit); 278 device_t ppbus = device_get_parent(ppidev); 279 int error = 0; 280 281 ppb_set_mode(ppbus, PPB_COMPATIBLE); 282 283 while (--maxretries > 0) { 284 pcfclock_write_cmd(dev, PCFCLOCK_CMD_TIME); 285 if (pcfclock_read_data(dev, buf, 68)) 286 continue; 287 288 if (!PCFCLOCK_CORRECT_SYNC(buf)) 289 continue; 290 291 if (!PCFCLOCK_CORRECT_FORMAT(buf)) 292 continue; 293 294 break; 295 } 296 297 if (!maxretries) 298 error = EIO; 299 300 return (error); 301 } 302 303 static int 304 pcfclock_read(struct cdev *dev, struct uio *uio, int ioflag) 305 { 306 u_int unit = minor(dev); 307 char buf[18]; 308 int error = 0; 309 310 if (uio->uio_resid < 18) 311 return (ERANGE); 312 313 error = pcfclock_read_dev(dev, buf, PCFCLOCK_MAX_RETRIES); 314 315 if (error) { 316 printf(PCFCLOCK_NAME "%d: no PCF found\n", unit); 317 } else { 318 pcfclock_display_data(dev, buf); 319 320 uiomove(buf, 18, uio); 321 } 322 323 return (error); 324 } 325 326 static device_method_t pcfclock_methods[] = { 327 /* device interface */ 328 DEVMETHOD(device_identify, pcfclock_identify), 329 DEVMETHOD(device_probe, pcfclock_probe), 330 DEVMETHOD(device_attach, pcfclock_attach), 331 332 { 0, 0 } 333 }; 334 335 static driver_t pcfclock_driver = { 336 PCFCLOCK_NAME, 337 pcfclock_methods, 338 sizeof(struct pcfclock_data), 339 }; 340 341 DRIVER_MODULE(pcfclock, ppbus, pcfclock_driver, pcfclock_devclass, 0, 0); 342