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 * $FreeBSD: src/sys/dev/iicbus/iicsmb.c,v 1.5.2.2 2000/08/09 00:59:27 peter Exp $ 27 * $DragonFly: src/sys/bus/iicbus/iicsmb.c,v 1.5 2006/12/22 23:12:16 swildner Exp $ 28 * 29 */ 30 31 /* 32 * I2C to SMB bridge 33 * 34 * Example: 35 * 36 * smb bttv 37 * \ / 38 * smbus 39 * / \ 40 * iicsmb bti2c 41 * | 42 * iicbus 43 * / | \ 44 * iicbb pcf ... 45 * | 46 * lpbb 47 */ 48 49 #include <sys/param.h> 50 #include <sys/kernel.h> 51 #include <sys/systm.h> 52 #include <sys/module.h> 53 #include <sys/bus.h> 54 #include <sys/conf.h> 55 #include <sys/buf.h> 56 #include <sys/uio.h> 57 #include <sys/malloc.h> 58 59 #include <machine/clock.h> 60 61 #include "iiconf.h" 62 #include "iicbus.h" 63 64 #include <bus/smbus/smbconf.h> 65 66 #include "iicbus_if.h" 67 #include "smbus_if.h" 68 69 struct iicsmb_softc { 70 71 #define SMB_WAITING_ADDR 0x0 72 #define SMB_WAITING_LOW 0x1 73 #define SMB_WAITING_HIGH 0x2 74 #define SMB_DONE 0x3 75 int state; 76 77 u_char devaddr; /* slave device address */ 78 79 char low; /* low byte received first */ 80 char high; /* high byte */ 81 82 device_t smbus; 83 }; 84 85 static int iicsmb_probe(device_t); 86 static int iicsmb_attach(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 DEVMETHOD(device_detach, bus_generic_detach), 108 109 /* bus interface */ 110 DEVMETHOD(bus_print_child, bus_generic_print_child), 111 112 /* iicbus interface */ 113 DEVMETHOD(iicbus_intr, iicsmb_intr), 114 115 /* smbus interface */ 116 DEVMETHOD(smbus_callback, iicsmb_callback), 117 DEVMETHOD(smbus_quick, iicsmb_quick), 118 DEVMETHOD(smbus_sendb, iicsmb_sendb), 119 DEVMETHOD(smbus_recvb, iicsmb_recvb), 120 DEVMETHOD(smbus_writeb, iicsmb_writeb), 121 DEVMETHOD(smbus_writew, iicsmb_writew), 122 DEVMETHOD(smbus_readb, iicsmb_readb), 123 DEVMETHOD(smbus_readw, iicsmb_readw), 124 DEVMETHOD(smbus_pcall, iicsmb_pcall), 125 DEVMETHOD(smbus_bwrite, iicsmb_bwrite), 126 DEVMETHOD(smbus_bread, iicsmb_bread), 127 128 { 0, 0 } 129 }; 130 131 static driver_t iicsmb_driver = { 132 "iicsmb", 133 iicsmb_methods, 134 sizeof(struct iicsmb_softc), 135 }; 136 137 static int 138 iicsmb_probe(device_t dev) 139 { 140 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); 141 142 sc->smbus = smbus_alloc_bus(dev); 143 144 if (!sc->smbus) 145 return (EINVAL); /* XXX don't know what to return else */ 146 147 return (0); 148 } 149 150 static int 151 iicsmb_attach(device_t dev) 152 { 153 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); 154 155 /* probe and attach the smbus */ 156 device_probe_and_attach(sc->smbus); 157 158 return (0); 159 } 160 161 /* 162 * iicsmb_intr() 163 * 164 * iicbus interrupt handler 165 */ 166 static void 167 iicsmb_intr(device_t dev, int event, char *buf) 168 { 169 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); 170 171 switch (event) { 172 case INTR_GENERAL: 173 case INTR_START: 174 sc->state = SMB_WAITING_ADDR; 175 break; 176 177 case INTR_STOP: 178 /* call smbus intr handler */ 179 smbus_intr(sc->smbus, sc->devaddr, 180 sc->low, sc->high, SMB_ENOERR); 181 break; 182 183 case INTR_RECEIVE: 184 switch (sc->state) { 185 case SMB_DONE: 186 /* XXX too much data, discard */ 187 kprintf("%s: too much data from 0x%x\n", __func__, 188 sc->devaddr & 0xff); 189 goto end; 190 191 case SMB_WAITING_ADDR: 192 sc->devaddr = (u_char)*buf; 193 sc->state = SMB_WAITING_LOW; 194 break; 195 196 case SMB_WAITING_LOW: 197 sc->low = *buf; 198 sc->state = SMB_WAITING_HIGH; 199 break; 200 201 case SMB_WAITING_HIGH: 202 sc->high = *buf; 203 sc->state = SMB_DONE; 204 break; 205 } 206 end: 207 break; 208 209 case INTR_TRANSMIT: 210 case INTR_NOACK: 211 break; 212 213 case INTR_ERROR: 214 switch (*buf) { 215 case IIC_EBUSERR: 216 smbus_intr(sc->smbus, sc->devaddr, 0, 0, SMB_EBUSERR); 217 break; 218 219 default: 220 kprintf("%s unknown error 0x%x!\n", __func__, 221 (int)*buf); 222 break; 223 } 224 break; 225 226 default: 227 panic("%s: unknown event (%d)!", __func__, event); 228 } 229 230 return; 231 } 232 233 static int 234 iicsmb_callback(device_t dev, int index, caddr_t data) 235 { 236 device_t parent = device_get_parent(dev); 237 int error = 0; 238 int how; 239 240 switch (index) { 241 case SMB_REQUEST_BUS: 242 /* request underlying iicbus */ 243 how = *(int *)data; 244 error = iicbus_request_bus(parent, dev, how); 245 break; 246 247 case SMB_RELEASE_BUS: 248 /* release underlying iicbus */ 249 error = iicbus_release_bus(parent, dev); 250 break; 251 252 default: 253 error = EINVAL; 254 } 255 256 return (error); 257 } 258 259 static int 260 iicsmb_quick(device_t dev, u_char slave, int how) 261 { 262 device_t parent = device_get_parent(dev); 263 int error; 264 265 switch (how) { 266 case SMB_QWRITE: 267 error = iicbus_start(parent, slave & ~LSB, 0); 268 break; 269 270 case SMB_QREAD: 271 error = iicbus_start(parent, slave | LSB, 0); 272 break; 273 274 default: 275 error = EINVAL; 276 break; 277 } 278 279 if (!error) 280 error = iicbus_stop(parent); 281 282 return (error); 283 } 284 285 static int 286 iicsmb_sendb(device_t dev, u_char slave, char byte) 287 { 288 device_t parent = device_get_parent(dev); 289 int error, sent; 290 291 error = iicbus_start(parent, slave & ~LSB, 0); 292 293 if (!error) { 294 error = iicbus_write(parent, &byte, 1, &sent, 0); 295 296 iicbus_stop(parent); 297 } 298 299 return (error); 300 } 301 302 static int 303 iicsmb_recvb(device_t dev, u_char slave, char *byte) 304 { 305 device_t parent = device_get_parent(dev); 306 int error, read; 307 308 error = iicbus_start(parent, slave | LSB, 0); 309 310 if (!error) { 311 error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0); 312 313 iicbus_stop(parent); 314 } 315 316 return (error); 317 } 318 319 static int 320 iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte) 321 { 322 device_t parent = device_get_parent(dev); 323 int error, sent; 324 325 error = iicbus_start(parent, slave & ~LSB, 0); 326 327 if (!error) { 328 if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0))) 329 error = iicbus_write(parent, &byte, 1, &sent, 0); 330 331 iicbus_stop(parent); 332 } 333 334 return (error); 335 } 336 337 static int 338 iicsmb_writew(device_t dev, u_char slave, char cmd, short word) 339 { 340 device_t parent = device_get_parent(dev); 341 int error, sent; 342 343 char low = (char)(word & 0xff); 344 char high = (char)((word & 0xff00) >> 8); 345 346 error = iicbus_start(parent, slave & ~LSB, 0); 347 348 if (!error) { 349 if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0))) 350 if (!(error = iicbus_write(parent, &low, 1, &sent, 0))) 351 error = iicbus_write(parent, &high, 1, &sent, 0); 352 353 iicbus_stop(parent); 354 } 355 356 return (error); 357 } 358 359 static int 360 iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte) 361 { 362 device_t parent = device_get_parent(dev); 363 int error, sent, read; 364 365 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 366 return (error); 367 368 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 369 goto error; 370 371 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 372 goto error; 373 374 if ((error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0))) 375 goto error; 376 377 error: 378 iicbus_stop(parent); 379 return (error); 380 } 381 382 #define BUF2SHORT(low,high) \ 383 ((short)(((high) & 0xff) << 8) | (short)((low) & 0xff)) 384 385 static int 386 iicsmb_readw(device_t dev, u_char slave, char cmd, short *word) 387 { 388 device_t parent = device_get_parent(dev); 389 int error, sent, read; 390 char buf[2]; 391 392 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 393 return (error); 394 395 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 396 goto error; 397 398 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 399 goto error; 400 401 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0))) 402 goto error; 403 404 /* first, receive low, then high byte */ 405 *word = BUF2SHORT(buf[0], buf[1]); 406 407 error: 408 iicbus_stop(parent); 409 return (error); 410 } 411 412 static int 413 iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata) 414 { 415 device_t parent = device_get_parent(dev); 416 int error, sent, read; 417 char buf[2]; 418 419 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 420 return (error); 421 422 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 423 goto error; 424 425 /* first, send low, then high byte */ 426 buf[0] = (char)(sdata & 0xff); 427 buf[1] = (char)((sdata & 0xff00) >> 8); 428 429 if ((error = iicbus_write(parent, buf, 2, &sent, 0))) 430 goto error; 431 432 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 433 goto error; 434 435 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0))) 436 goto error; 437 438 /* first, receive low, then high byte */ 439 *rdata = BUF2SHORT(buf[0], buf[1]); 440 441 error: 442 iicbus_stop(parent); 443 return (error); 444 } 445 446 static int 447 iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf) 448 { 449 device_t parent = device_get_parent(dev); 450 int error, sent; 451 452 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 453 goto error; 454 455 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 456 goto error; 457 458 if ((error = iicbus_write(parent, buf, (int)count, &sent, 0))) 459 goto error; 460 461 if ((error = iicbus_stop(parent))) 462 goto error; 463 464 error: 465 return (error); 466 } 467 468 static int 469 iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf) 470 { 471 device_t parent = device_get_parent(dev); 472 int error, sent, read; 473 474 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 475 return (error); 476 477 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 478 goto error; 479 480 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 481 goto error; 482 483 if ((error = iicbus_read(parent, buf, (int)count, &read, 484 IIC_LAST_READ, 0))) 485 goto error; 486 487 error: 488 iicbus_stop(parent); 489 return (error); 490 } 491 492 DRIVER_MODULE(iicsmb, iicbus, iicsmb_driver, iicsmb_devclass, 0, 0); 493