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 * $FreeBSD$ 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 87 static void iicsmb_intr(device_t dev, int event, char *buf); 88 static int iicsmb_callback(device_t dev, int index, caddr_t data); 89 static int iicsmb_quick(device_t dev, u_char slave, int how); 90 static int iicsmb_sendb(device_t dev, u_char slave, char byte); 91 static int iicsmb_recvb(device_t dev, u_char slave, char *byte); 92 static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte); 93 static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word); 94 static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte); 95 static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word); 96 static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata); 97 static int iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf); 98 static int iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf); 99 100 static devclass_t iicsmb_devclass; 101 102 static device_method_t iicsmb_methods[] = { 103 /* device interface */ 104 DEVMETHOD(device_probe, iicsmb_probe), 105 DEVMETHOD(device_attach, iicsmb_attach), 106 107 /* bus interface */ 108 DEVMETHOD(bus_print_child, bus_generic_print_child), 109 110 /* iicbus interface */ 111 DEVMETHOD(iicbus_intr, iicsmb_intr), 112 113 /* smbus interface */ 114 DEVMETHOD(smbus_callback, iicsmb_callback), 115 DEVMETHOD(smbus_quick, iicsmb_quick), 116 DEVMETHOD(smbus_sendb, iicsmb_sendb), 117 DEVMETHOD(smbus_recvb, iicsmb_recvb), 118 DEVMETHOD(smbus_writeb, iicsmb_writeb), 119 DEVMETHOD(smbus_writew, iicsmb_writew), 120 DEVMETHOD(smbus_readb, iicsmb_readb), 121 DEVMETHOD(smbus_readw, iicsmb_readw), 122 DEVMETHOD(smbus_pcall, iicsmb_pcall), 123 DEVMETHOD(smbus_bwrite, iicsmb_bwrite), 124 DEVMETHOD(smbus_bread, iicsmb_bread), 125 126 { 0, 0 } 127 }; 128 129 static driver_t iicsmb_driver = { 130 "iicsmb", 131 iicsmb_methods, 132 sizeof(struct iicsmb_softc), 133 }; 134 135 static int 136 iicsmb_probe(device_t dev) 137 { 138 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); 139 140 sc->smbus = smbus_alloc_bus(dev); 141 142 if (!sc->smbus) 143 return (EINVAL); /* XXX don't know what to return else */ 144 145 return (0); 146 } 147 148 static int 149 iicsmb_attach(device_t dev) 150 { 151 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); 152 153 /* probe and attach the smbus */ 154 device_probe_and_attach(sc->smbus); 155 156 return (0); 157 } 158 159 /* 160 * iicsmb_intr() 161 * 162 * iicbus interrupt handler 163 */ 164 static void 165 iicsmb_intr(device_t dev, int event, char *buf) 166 { 167 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev); 168 169 switch (event) { 170 case INTR_GENERAL: 171 case INTR_START: 172 sc->state = SMB_WAITING_ADDR; 173 break; 174 175 case INTR_STOP: 176 /* call smbus intr handler */ 177 smbus_intr(sc->smbus, sc->devaddr, 178 sc->low, sc->high, SMB_ENOERR); 179 break; 180 181 case INTR_RECEIVE: 182 switch (sc->state) { 183 case SMB_DONE: 184 /* XXX too much data, discard */ 185 printf("%s: too much data from 0x%x\n", __FUNCTION__, 186 sc->devaddr & 0xff); 187 goto end; 188 189 case SMB_WAITING_ADDR: 190 sc->devaddr = (u_char)*buf; 191 sc->state = SMB_WAITING_LOW; 192 break; 193 194 case SMB_WAITING_LOW: 195 sc->low = *buf; 196 sc->state = SMB_WAITING_HIGH; 197 break; 198 199 case SMB_WAITING_HIGH: 200 sc->high = *buf; 201 sc->state = SMB_DONE; 202 break; 203 } 204 end: 205 break; 206 207 case INTR_TRANSMIT: 208 case INTR_NOACK: 209 break; 210 211 case INTR_ERROR: 212 switch (*buf) { 213 case IIC_EBUSERR: 214 smbus_intr(sc->smbus, sc->devaddr, 0, 0, SMB_EBUSERR); 215 break; 216 217 default: 218 printf("%s unknown error 0x%x!\n", __FUNCTION__, 219 (int)*buf); 220 break; 221 } 222 break; 223 224 default: 225 panic("%s: unknown event (%d)!", __FUNCTION__, event); 226 } 227 228 return; 229 } 230 231 static int 232 iicsmb_callback(device_t dev, int index, caddr_t data) 233 { 234 device_t parent = device_get_parent(dev); 235 int error = 0; 236 int how; 237 238 switch (index) { 239 case SMB_REQUEST_BUS: 240 /* request underlying iicbus */ 241 how = *(int *)data; 242 error = iicbus_request_bus(parent, dev, how); 243 break; 244 245 case SMB_RELEASE_BUS: 246 /* release underlying iicbus */ 247 error = iicbus_release_bus(parent, dev); 248 break; 249 250 default: 251 error = EINVAL; 252 } 253 254 return (error); 255 } 256 257 static int 258 iicsmb_quick(device_t dev, u_char slave, int how) 259 { 260 device_t parent = device_get_parent(dev); 261 int error; 262 263 switch (how) { 264 case SMB_QWRITE: 265 error = iicbus_start(parent, slave & ~LSB, 0); 266 break; 267 268 case SMB_QREAD: 269 error = iicbus_start(parent, slave | LSB, 0); 270 break; 271 272 default: 273 error = EINVAL; 274 break; 275 } 276 277 if (!error) 278 error = iicbus_stop(parent); 279 280 return (error); 281 } 282 283 static int 284 iicsmb_sendb(device_t dev, u_char slave, char byte) 285 { 286 device_t parent = device_get_parent(dev); 287 int error, sent; 288 289 error = iicbus_start(parent, slave & ~LSB, 0); 290 291 if (!error) { 292 error = iicbus_write(parent, &byte, 1, &sent, 0); 293 294 iicbus_stop(parent); 295 } 296 297 return (error); 298 } 299 300 static int 301 iicsmb_recvb(device_t dev, u_char slave, char *byte) 302 { 303 device_t parent = device_get_parent(dev); 304 int error, read; 305 306 error = iicbus_start(parent, slave | LSB, 0); 307 308 if (!error) { 309 error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0); 310 311 iicbus_stop(parent); 312 } 313 314 return (error); 315 } 316 317 static int 318 iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte) 319 { 320 device_t parent = device_get_parent(dev); 321 int error, sent; 322 323 error = iicbus_start(parent, slave & ~LSB, 0); 324 325 if (!error) { 326 if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0))) 327 error = iicbus_write(parent, &byte, 1, &sent, 0); 328 329 iicbus_stop(parent); 330 } 331 332 return (error); 333 } 334 335 static int 336 iicsmb_writew(device_t dev, u_char slave, char cmd, short word) 337 { 338 device_t parent = device_get_parent(dev); 339 int error, sent; 340 341 char low = (char)(word & 0xff); 342 char high = (char)((word & 0xff00) >> 8); 343 344 error = iicbus_start(parent, slave & ~LSB, 0); 345 346 if (!error) { 347 if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0))) 348 if (!(error = iicbus_write(parent, &low, 1, &sent, 0))) 349 error = iicbus_write(parent, &high, 1, &sent, 0); 350 351 iicbus_stop(parent); 352 } 353 354 return (error); 355 } 356 357 static int 358 iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte) 359 { 360 device_t parent = device_get_parent(dev); 361 int error, sent, read; 362 363 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 364 return (error); 365 366 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 367 goto error; 368 369 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 370 goto error; 371 372 if ((error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0))) 373 goto error; 374 375 error: 376 iicbus_stop(parent); 377 return (error); 378 } 379 380 #define BUF2SHORT(low,high) \ 381 ((short)(((high) & 0xff) << 8) | (short)((low) & 0xff)) 382 383 static int 384 iicsmb_readw(device_t dev, u_char slave, char cmd, short *word) 385 { 386 device_t parent = device_get_parent(dev); 387 int error, sent, read; 388 char buf[2]; 389 390 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 391 return (error); 392 393 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 394 goto error; 395 396 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 397 goto error; 398 399 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0))) 400 goto error; 401 402 /* first, receive low, then high byte */ 403 *word = BUF2SHORT(buf[0], buf[1]); 404 405 error: 406 iicbus_stop(parent); 407 return (error); 408 } 409 410 static int 411 iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata) 412 { 413 device_t parent = device_get_parent(dev); 414 int error, sent, read; 415 char buf[2]; 416 417 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 418 return (error); 419 420 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 421 goto error; 422 423 /* first, send low, then high byte */ 424 buf[0] = (char)(sdata & 0xff); 425 buf[1] = (char)((sdata & 0xff00) >> 8); 426 427 if ((error = iicbus_write(parent, buf, 2, &sent, 0))) 428 goto error; 429 430 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 431 goto error; 432 433 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0))) 434 goto error; 435 436 /* first, receive low, then high byte */ 437 *rdata = BUF2SHORT(buf[0], buf[1]); 438 439 error: 440 iicbus_stop(parent); 441 return (error); 442 } 443 444 static int 445 iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf) 446 { 447 device_t parent = device_get_parent(dev); 448 int error, sent; 449 450 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 451 goto error; 452 453 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 454 goto error; 455 456 if ((error = iicbus_write(parent, buf, (int)count, &sent, 0))) 457 goto error; 458 459 if ((error = iicbus_stop(parent))) 460 goto error; 461 462 error: 463 return (error); 464 } 465 466 static int 467 iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf) 468 { 469 device_t parent = device_get_parent(dev); 470 int error, sent, read; 471 472 if ((error = iicbus_start(parent, slave & ~LSB, 0))) 473 return (error); 474 475 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0))) 476 goto error; 477 478 if ((error = iicbus_repeated_start(parent, slave | LSB, 0))) 479 goto error; 480 481 if ((error = iicbus_read(parent, buf, (int)count, &read, 482 IIC_LAST_READ, 0))) 483 goto error; 484 485 error: 486 iicbus_stop(parent); 487 return (error); 488 } 489 490 DRIVER_MODULE(iicsmb, iicbus, iicsmb_driver, iicsmb_devclass, 0, 0); 491