1 /*- 2 * Copyright (c) 1998 Nicolas Souchu 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $Id: iicsmb.c,v 1.2 1998/10/31 11:31:07 nsouch Exp $ 27 * 28 */ 29 30 /* 31 * I2C to SMB bridge 32 * 33 * Example: 34 * 35 * smb bttv 36 * \ / 37 * smbus 38 * / \ 39 * iicsmb bti2c 40 * | 41 * iicbus 42 * / | \ 43 * iicbb pcf ... 44 * | 45 * lpbb 46 */ 47 48 #include <sys/param.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 #include <sys/module.h> 52 #include <sys/bus.h> 53 #include <sys/conf.h> 54 #include <sys/buf.h> 55 #include <sys/uio.h> 56 #include <sys/malloc.h> 57 58 #include <machine/clock.h> 59 60 #include <dev/iicbus/iiconf.h> 61 #include <dev/iicbus/iicbus.h> 62 63 #include <dev/smbus/smbconf.h> 64 65 #include "iicbus_if.h" 66 #include "smbus_if.h" 67 68 struct iicsmb_softc { 69 70 #define SMB_WAITING_ADDR 0x0 71 #define SMB_WAITING_LOW 0x1 72 #define SMB_WAITING_HIGH 0x2 73 #define SMB_DONE 0x3 74 int state; 75 76 u_char devaddr; /* slave device address */ 77 78 char low; /* low byte received first */ 79 char high; /* high byte */ 80 81 device_t smbus; 82 }; 83 84 static int iicsmb_probe(device_t); 85 static int iicsmb_attach(device_t); 86 static void iicsmb_print_child(device_t, device_t); 87 88 static void iicsmb_intr(device_t dev, int event, char *buf); 89 static int iicsmb_callback(device_t dev, int index, caddr_t data); 90 static int iicsmb_quick(device_t dev, u_char slave, int how); 91 static int iicsmb_sendb(device_t dev, u_char slave, char byte); 92 static int iicsmb_recvb(device_t dev, u_char slave, char *byte); 93 static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte); 94 static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word); 95 static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte); 96 static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word); 97 static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata); 98 static int iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf); 99 static int iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf); 100 101 static devclass_t iicsmb_devclass; 102 103 static device_method_t iicsmb_methods[] = { 104 /* device interface */ 105 DEVMETHOD(device_probe, iicsmb_probe), 106 DEVMETHOD(device_attach, iicsmb_attach), 107 108 /* bus interface */ 109 DEVMETHOD(bus_print_child, iicsmb_print_child), 110 111 /* iicbus interface */ 112 DEVMETHOD(iicbus_intr, iicsmb_intr), 113 114 /* smbus interface */ 115 DEVMETHOD(smbus_callback, iicsmb_callback), 116 DEVMETHOD(smbus_quick, iicsmb_quick), 117 DEVMETHOD(smbus_sendb, iicsmb_sendb), 118 DEVMETHOD(smbus_recvb, iicsmb_recvb), 119 DEVMETHOD(smbus_writeb, iicsmb_writeb), 120 DEVMETHOD(smbus_writew, iicsmb_writew), 121 DEVMETHOD(smbus_readb, iicsmb_readb), 122 DEVMETHOD(smbus_readw, iicsmb_readw), 123 DEVMETHOD(smbus_pcall, iicsmb_pcall), 124 DEVMETHOD(smbus_bwrite, iicsmb_bwrite), 125 DEVMETHOD(smbus_bread, iicsmb_bread), 126 127 { 0, 0 } 128 }; 129 130 static driver_t iicsmb_driver = { 131 "iicsmb", 132 iicsmb_methods, 133 sizeof(struct iicsmb_softc), 134 }; 135 136 static int 137 iicsmb_probe(device_t dev) 138 { 139 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); 140 141 sc->smbus = smbus_alloc_bus(dev); 142 143 if (!sc->smbus) 144 return (EINVAL); /* XXX don't know what to return else */ 145 146 return (0); 147 } 148 149 static int 150 iicsmb_attach(device_t dev) 151 { 152 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); 153 154 /* probe and attach the smbus */ 155 device_probe_and_attach(sc->smbus); 156 157 return (0); 158 } 159 160 static void 161 iicsmb_print_child(device_t bus, device_t dev) 162 { 163 printf(" on %s%d", device_get_name(bus), device_get_unit(bus)); 164 165 return; 166 } 167 168 /* 169 * iicsmb_intr() 170 * 171 * iicbus interrupt handler 172 */ 173 static void 174 iicsmb_intr(device_t dev, int event, char *buf) 175 { 176 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); 177 178 switch (event) { 179 case INTR_GENERAL: 180 case INTR_START: 181 sc->state = SMB_WAITING_ADDR; 182 break; 183 184 case INTR_STOP: 185 /* call smbus intr handler */ 186 smbus_intr(sc->smbus, sc->devaddr, 187 sc->low, sc->high, SMB_ENOERR); 188 break; 189 190 case INTR_RECEIVE: 191 switch (sc->state) { 192 case SMB_DONE: 193 /* XXX too much data, discard */ 194 printf("%s: too much data from 0x%x\n", __FUNCTION__, 195 sc->devaddr & 0xff); 196 goto end; 197 198 case SMB_WAITING_ADDR: 199 sc->devaddr = (u_char)*buf; 200 sc->state = SMB_WAITING_LOW; 201 break; 202 203 case SMB_WAITING_LOW: 204 sc->low = *buf; 205 sc->state = SMB_WAITING_HIGH; 206 break; 207 208 case SMB_WAITING_HIGH: 209 sc->high = *buf; 210 sc->state = SMB_DONE; 211 break; 212 } 213 end: 214 break; 215 216 case INTR_TRANSMIT: 217 case INTR_NOACK: 218 break; 219 220 case INTR_ERROR: 221 switch (*buf) { 222 case IIC_EBUSERR: 223 smbus_intr(sc->smbus, sc->devaddr, 0, 0, SMB_EBUSERR); 224 break; 225 226 default: 227 printf("%s unknown error 0x%x!\n", __FUNCTION__, 228 (int)*buf); 229 break; 230 } 231 break; 232 233 default: 234 panic("%s: unknown event (%d)!", __FUNCTION__, event); 235 } 236 237 return; 238 } 239 240 static int 241 iicsmb_callback(device_t dev, int index, caddr_t data) 242 { 243 device_t parent = device_get_parent(dev); 244 int error = 0; 245 int how; 246 247 switch (index) { 248 case SMB_REQUEST_BUS: 249 /* request underlying iicbus */ 250 how = *(int *)data; 251 error = iicbus_request_bus(parent, dev, how); 252 break; 253 254 case SMB_RELEASE_BUS: 255 /* release underlying iicbus */ 256 error = iicbus_release_bus(parent, dev); 257 break; 258 259 default: 260 error = EINVAL; 261 } 262 263 return (error); 264 } 265 266 static int 267 iicsmb_quick(device_t dev, u_char slave, int how) 268 { 269 device_t parent = device_get_parent(dev); 270 int error; 271 272 switch (how) { 273 case SMB_QWRITE: 274 error = iicbus_start(parent, slave & ~LSB, 0); 275 break; 276 277 case SMB_QREAD: 278 error = iicbus_start(parent, slave | LSB, 0); 279 break; 280 281 default: 282 error = EINVAL; 283 break; 284 } 285 286 if (!error) 287 error = iicbus_stop(parent); 288 289 return (error); 290 } 291 292 static int 293 iicsmb_sendb(device_t dev, u_char slave, char byte) 294 { 295 device_t parent = device_get_parent(dev); 296 int error, sent; 297 298 error = iicbus_start(parent, slave & ~LSB, 0); 299 300 if (!error) { 301 error = iicbus_write(parent, &byte, 1, &sent, 0); 302 303 iicbus_stop(parent); 304 } 305 306 return (error); 307 } 308 309 static int 310 iicsmb_recvb(device_t dev, u_char slave, char *byte) 311 { 312 device_t parent = device_get_parent(dev); 313 int error, read; 314 315 error = iicbus_start(parent, slave | LSB, 0); 316 317 if (!error) { 318 error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0); 319 320 iicbus_stop(parent); 321 } 322 323 return (error); 324 } 325 326 static int 327 iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte) 328 { 329 device_t parent = device_get_parent(dev); 330 int error, sent; 331 332 error = iicbus_start(parent, slave & ~LSB, 0); 333 334 if (!error) { 335 if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0))) 336 error = iicbus_write(parent, &byte, 1, &sent, 0); 337 338 iicbus_stop(parent); 339 } 340 341 return (error); 342 } 343 344 static int 345 iicsmb_writew(device_t dev, u_char slave, char cmd, short word) 346 { 347 device_t parent = device_get_parent(dev); 348 int error, sent; 349 350 char low = (char)(word & 0xff); 351 char high = (char)((word & 0xff00) >> 8); 352 353 error = iicbus_start(parent, slave & ~LSB, 0); 354 355 if (!error) { 356 if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0))) 357 if (!(error = iicbus_write(parent, &low, 1, &sent, 0))) 358 error = iicbus_write(parent, &high, 1, &sent, 0); 359 360 iicbus_stop(parent); 361 } 362 363 return (error); 364 } 365 366 static int 367 iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte) 368 { 369 device_t parent = device_get_parent(dev); 370 int error, sent, read; 371 372 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 373 return (error); 374 375 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 376 goto error; 377 378 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 379 goto error; 380 381 if ((error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0))) 382 goto error; 383 384 error: 385 iicbus_stop(parent); 386 return (error); 387 } 388 389 #define BUF2SHORT(low,high) \ 390 ((short)(((high) & 0xff) << 8) | (short)((low) & 0xff)) 391 392 static int 393 iicsmb_readw(device_t dev, u_char slave, char cmd, short *word) 394 { 395 device_t parent = device_get_parent(dev); 396 int error, sent, read; 397 char buf[2]; 398 399 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 400 return (error); 401 402 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 403 goto error; 404 405 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 406 goto error; 407 408 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0))) 409 goto error; 410 411 /* first, receive low, then high byte */ 412 *word = BUF2SHORT(buf[0], buf[1]); 413 414 error: 415 iicbus_stop(parent); 416 return (error); 417 } 418 419 static int 420 iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata) 421 { 422 device_t parent = device_get_parent(dev); 423 int error, sent, read; 424 char buf[2]; 425 426 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 427 return (error); 428 429 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 430 goto error; 431 432 /* first, send low, then high byte */ 433 buf[0] = (char)(sdata & 0xff); 434 buf[1] = (char)((sdata & 0xff00) >> 8); 435 436 if ((error = iicbus_write(parent, buf, 2, &sent, 0))) 437 goto error; 438 439 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 440 goto error; 441 442 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0))) 443 goto error; 444 445 /* first, receive low, then high byte */ 446 *rdata = BUF2SHORT(buf[0], buf[1]); 447 448 error: 449 iicbus_stop(parent); 450 return (error); 451 } 452 453 static int 454 iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf) 455 { 456 device_t parent = device_get_parent(dev); 457 int error, sent; 458 459 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 460 goto error; 461 462 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 463 goto error; 464 465 if ((error = iicbus_write(parent, buf, (int)count, &sent, 0))) 466 goto error; 467 468 if ((error = iicbus_stop(parent))) 469 goto error; 470 471 error: 472 return (error); 473 } 474 475 static int 476 iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf) 477 { 478 device_t parent = device_get_parent(dev); 479 int error, sent, read; 480 481 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 482 return (error); 483 484 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 485 goto error; 486 487 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 488 goto error; 489 490 if ((error = iicbus_read(parent, buf, (int)count, &read, 491 IIC_LAST_READ, 0))) 492 goto error; 493 494 error: 495 iicbus_stop(parent); 496 return (error); 497 } 498 499 DRIVER_MODULE(iicsmb, iicbus, iicsmb_driver, iicsmb_devclass, 0, 0); 500