1 /** @file 2 Implementation of SmBusLib class library for DXE phase. 3 4 Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 14 **/ 15 16 #include "InternalSmbusLib.h" 17 18 /** 19 Executes an SMBUS quick read command. 20 21 Executes an SMBUS quick read command on the SMBUS device specified by SmBusAddress. 22 Only the SMBUS slave address field of SmBusAddress is required. 23 If Status is not NULL, then the status of the executed command is returned in Status. 24 If PEC is set in SmBusAddress, then ASSERT(). 25 If Command in SmBusAddress is not zero, then ASSERT(). 26 If Length in SmBusAddress is not zero, then ASSERT(). 27 If any reserved bits of SmBusAddress are set, then ASSERT(). 28 29 @param SmBusAddress The address that encodes the SMBUS Slave Address, 30 SMBUS Command, SMBUS Data Length, and PEC. 31 @param Status Return status for the executed command. 32 This is an optional parameter and may be NULL. 33 RETURN_SUCCESS: The SMBUS command was executed. 34 RETURN_TIMEOUT: A timeout occurred while executing the 35 SMBUS command. 36 RETURN_DEVICE_ERROR: The request was not 37 completed because a failure reflected in the Host Status 38 Register bit. Device errors are a result of a transaction 39 collision, illegal command field, unclaimed cycle (host 40 initiated), or bus errors (collisions). 41 RETURN_UNSUPPORTED: The SMBus operation is not supported. 42 43 **/ 44 VOID 45 EFIAPI 46 SmBusQuickRead ( 47 IN UINTN SmBusAddress, 48 OUT RETURN_STATUS *Status OPTIONAL 49 ) 50 { 51 ASSERT (!SMBUS_LIB_PEC (SmBusAddress)); 52 ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0); 53 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0); 54 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 55 56 InternalSmBusExec (EfiSmbusQuickRead, SmBusAddress, 0, NULL, Status); 57 } 58 59 /** 60 Executes an SMBUS quick write command. 61 62 Executes an SMBUS quick write command on the SMBUS device specified by SmBusAddress. 63 Only the SMBUS slave address field of SmBusAddress is required. 64 If Status is not NULL, then the status of the executed command is returned in Status. 65 If PEC is set in SmBusAddress, then ASSERT(). 66 If Command in SmBusAddress is not zero, then ASSERT(). 67 If Length in SmBusAddress is not zero, then ASSERT(). 68 If any reserved bits of SmBusAddress are set, then ASSERT(). 69 70 @param SmBusAddress The address that encodes the SMBUS Slave Address, 71 SMBUS Command, SMBUS Data Length, and PEC. 72 @param Status Return status for the executed command. 73 This is an optional parameter and may be NULL. 74 RETURN_SUCCESS: The SMBUS command was executed. 75 RETURN_TIMEOUT: A timeout occurred while executing the 76 SMBUS command. 77 RETURN_DEVICE_ERROR: The request was not completed because 78 a failure reflected in the Host Status Register bit. 79 Device errors are a result of a transaction collision, 80 illegal command field, unclaimed cycle (host initiated), 81 or bus errors (collisions). 82 RETURN_UNSUPPORTED: The SMBus operation is not supported. 83 84 **/ 85 VOID 86 EFIAPI 87 SmBusQuickWrite ( 88 IN UINTN SmBusAddress, 89 OUT RETURN_STATUS *Status OPTIONAL 90 ) 91 { 92 ASSERT (!SMBUS_LIB_PEC (SmBusAddress)); 93 ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0); 94 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0); 95 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 96 97 InternalSmBusExec (EfiSmbusQuickWrite, SmBusAddress, 0, NULL, Status); 98 } 99 100 /** 101 Executes an SMBUS receive byte command. 102 103 Executes an SMBUS receive byte command on the SMBUS device specified by SmBusAddress. 104 Only the SMBUS slave address field of SmBusAddress is required. 105 The byte received from the SMBUS is returned. 106 If Status is not NULL, then the status of the executed command is returned in Status. 107 If Command in SmBusAddress is not zero, then ASSERT(). 108 If Length in SmBusAddress is not zero, then ASSERT(). 109 If any reserved bits of SmBusAddress are set, then ASSERT(). 110 111 @param SmBusAddress The address that encodes the SMBUS Slave Address, 112 SMBUS Command, SMBUS Data Length, and PEC. 113 @param Status Return status for the executed command. 114 This is an optional parameter and may be NULL. 115 RETURN_SUCCESS: The SMBUS command was executed. 116 RETURN_TIMEOUT: A timeout occurred while executing the 117 SMBUS command. 118 RETURN_DEVICE_ERROR: The request was not completed because 119 a failure reflected in the Host Status Register bit. Device 120 errors are a result of a transaction collision, illegal 121 command field, unclaimed cycle(host initiated), or bus 122 errors (collisions). 123 RETURN_CRC_ERROR: The checksum is not correct. (PEC is incorrect.) 124 RETURN_UNSUPPORTED: The SMBus operation is not supported. 125 126 @return The byte received from the SMBUS. 127 128 **/ 129 UINT8 130 EFIAPI 131 SmBusReceiveByte ( 132 IN UINTN SmBusAddress, 133 OUT RETURN_STATUS *Status OPTIONAL 134 ) 135 { 136 UINT8 Byte; 137 138 ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0); 139 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0); 140 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 141 142 InternalSmBusExec (EfiSmbusReceiveByte, SmBusAddress, 1, &Byte, Status); 143 144 return Byte; 145 } 146 147 /** 148 Executes an SMBUS send byte command. 149 150 Executes an SMBUS send byte command on the SMBUS device specified by SmBusAddress. 151 The byte specified by Value is sent. 152 Only the SMBUS slave address field of SmBusAddress is required. Value is returned. 153 If Status is not NULL, then the status of the executed command is returned in Status. 154 If Command in SmBusAddress is not zero, then ASSERT(). 155 If Length in SmBusAddress is not zero, then ASSERT(). 156 If any reserved bits of SmBusAddress are set, then ASSERT(). 157 158 @param SmBusAddress The address that encodes the SMBUS Slave Address, 159 SMBUS Command, SMBUS Data Length, and PEC. 160 @param Value The 8-bit value to send. 161 @param Status Return status for the executed command. 162 This is an optional parameter and may be NULL. 163 RETURN_SUCCESS: The SMBUS command was executed. 164 RETURN_TIMEOUT: A timeout occurred while executing the 165 SMBUS command. 166 RETURN_DEVICE_ERROR: The request was not completed because 167 a failure reflected in the Host Status Register bit. Device 168 errors are a result of a transaction collision, illegal 169 command field, unclaimed cycle(host initiated), or bus 170 errors (collisions). 171 RETURN_CRC_ERROR: The checksum is not correct (PEC is incorrect) 172 RETURN_UNSUPPORTED: The SMBus operation is not supported. 173 174 @return The parameter of Value. 175 176 **/ 177 UINT8 178 EFIAPI 179 SmBusSendByte ( 180 IN UINTN SmBusAddress, 181 IN UINT8 Value, 182 OUT RETURN_STATUS *Status OPTIONAL 183 ) 184 { 185 UINT8 Byte; 186 187 ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0); 188 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0); 189 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 190 191 Byte = Value; 192 InternalSmBusExec (EfiSmbusSendByte, SmBusAddress, 1, &Byte, Status); 193 194 return Value; 195 } 196 197 /** 198 Executes an SMBUS read data byte command. 199 200 Executes an SMBUS read data byte command on the SMBUS device specified by SmBusAddress. 201 Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required. 202 The 8-bit value read from the SMBUS is returned. 203 If Status is not NULL, then the status of the executed command is returned in Status. 204 If Length in SmBusAddress is not zero, then ASSERT(). 205 If any reserved bits of SmBusAddress are set, then ASSERT(). 206 207 @param SmBusAddress The address that encodes the SMBUS Slave Address, 208 SMBUS Command, SMBUS Data Length, and PEC. 209 @param Status Return status for the executed command. 210 This is an optional parameter and may be NULL. 211 RETURN_SUCCESS: The SMBUS command was executed. 212 RETURN_TIMEOUT: A timeout occurred while executing the 213 SMBUS command. 214 RETURN_DEVICE_ERROR: The request was not completed because 215 a failurereflected in the Host Status Register bit. Device 216 errors are a result of a transaction collision, illegal 217 command field, unclaimed cycle (host initiated), or bus 218 errors (collisions). 219 RETURN_CRC_ERROR: The checksum is not correct (PEC is incorrect) 220 RETURN_UNSUPPORTED: The SMBus operation is not supported. 221 222 @return The byte read from the SMBUS. 223 224 **/ 225 UINT8 226 EFIAPI 227 SmBusReadDataByte ( 228 IN UINTN SmBusAddress, 229 OUT RETURN_STATUS *Status OPTIONAL 230 ) 231 { 232 UINT8 Byte; 233 234 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0); 235 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 236 237 InternalSmBusExec (EfiSmbusReadByte, SmBusAddress, 1, &Byte, Status); 238 239 return Byte; 240 } 241 242 /** 243 Executes an SMBUS write data byte command. 244 245 Executes an SMBUS write data byte command on the SMBUS device specified by SmBusAddress. 246 The 8-bit value specified by Value is written. 247 Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required. 248 Value is returned. 249 If Status is not NULL, then the status of the executed command is returned in Status. 250 If Length in SmBusAddress is not zero, then ASSERT(). 251 If any reserved bits of SmBusAddress are set, then ASSERT(). 252 253 @param SmBusAddress The address that encodes the SMBUS Slave Address, 254 SMBUS Command, SMBUS Data Length, and PEC. 255 @param Value The 8-bit value to write. 256 @param Status Return status for the executed command. 257 This is an optional parameter and may be NULL. 258 RETURN_SUCCESS: The SMBUS command was executed. 259 RETURN_TIMEOUT: A timeout occurred while executing the 260 SMBUS command. 261 RETURN_DEVICE_ERROR: The request was not completed because 262 a failure reflected in the Host Status Register bit. Device 263 errors are a result of a transaction collision, illegal 264 command field, unclaimed cycle host initiated), or bus 265 errors (collisions). 266 RETURN_CRC_ERROR: The checksum is not correct. (PEC is incorrect.) 267 RETURN_UNSUPPORTED: The SMBus operation is not supported. 268 269 @return The parameter of Value. 270 271 **/ 272 UINT8 273 EFIAPI 274 SmBusWriteDataByte ( 275 IN UINTN SmBusAddress, 276 IN UINT8 Value, 277 OUT RETURN_STATUS *Status OPTIONAL 278 ) 279 { 280 UINT8 Byte; 281 282 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0); 283 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 284 285 Byte = Value; 286 InternalSmBusExec (EfiSmbusWriteByte, SmBusAddress, 1, &Byte, Status); 287 288 return Value; 289 } 290 291 /** 292 Executes an SMBUS read data word command. 293 294 Executes an SMBUS read data word command on the SMBUS device specified by SmBusAddress. 295 Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required. 296 The 16-bit value read from the SMBUS is returned. 297 If Status is not NULL, then the status of the executed command is returned in Status. 298 If Length in SmBusAddress is not zero, then ASSERT(). 299 If any reserved bits of SmBusAddress are set, then ASSERT(). 300 301 @param SmBusAddress The address that encodes the SMBUS Slave Address, 302 SMBUS Command, SMBUS Data Length, and PEC. 303 @param Status Return status for the executed command. 304 This is an optional parameter and may be NULL. 305 RETURN_SUCCESS: The SMBUS command was executed. 306 RETURN_TIMEOUT: A timeout occurred while executing the 307 SMBUS command. 308 RETURN_DEVICE_ERROR: The request was not completed because 309 a failure reflected in the Host Status Register bit. 310 Device errors are a result of a transaction collision, 311 illegal command field, unclaimed cycle (host initiated), 312 or bus errors (collisions). 313 RETURN_CRC_ERROR: The checksum is not correct. (PEC is 314 incorrect.) 315 RETURN_UNSUPPORTED: The SMBus operation is not supported. 316 317 @return The byte read from the SMBUS. 318 319 **/ 320 UINT16 321 EFIAPI 322 SmBusReadDataWord ( 323 IN UINTN SmBusAddress, 324 OUT RETURN_STATUS *Status OPTIONAL 325 ) 326 { 327 UINT16 Word; 328 329 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0); 330 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 331 332 InternalSmBusExec (EfiSmbusReadWord, SmBusAddress, 2, &Word, Status); 333 334 return Word; 335 } 336 337 /** 338 Executes an SMBUS write data word command. 339 340 Executes an SMBUS write data word command on the SMBUS device specified by SmBusAddress. 341 The 16-bit value specified by Value is written. 342 Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required. 343 Value is returned. 344 If Status is not NULL, then the status of the executed command is returned in Status. 345 If Length in SmBusAddress is not zero, then ASSERT(). 346 If any reserved bits of SmBusAddress are set, then ASSERT(). 347 348 @param SmBusAddress The address that encodes the SMBUS Slave Address, 349 SMBUS Command, SMBUS Data Length, and PEC. 350 @param Value The 16-bit value to write. 351 @param Status Return status for the executed command. 352 This is an optional parameter and may be NULL. 353 RETURN_SUCCESS: The SMBUS command was executed. 354 RETURN_TIMEOUT: A timeout occurred while executing the SMBUS 355 command. 356 RETURN_DEVICE_ERROR: The request was not completed because 357 a failure reflected in the Host Status Register bit. 358 Device errors are a result of a transaction collision, 359 illegal command field, unclaimed cycle (host initiated), 360 or bus errors (collisions). 361 RETURN_CRC_ERROR: The checksum is not correct. 362 (PEC is incorrect.) 363 RETURN_UNSUPPORTED: The SMBus operation is not supported. 364 365 @return The parameter of Value. 366 367 **/ 368 UINT16 369 EFIAPI 370 SmBusWriteDataWord ( 371 IN UINTN SmBusAddress, 372 IN UINT16 Value, 373 OUT RETURN_STATUS *Status OPTIONAL 374 ) 375 { 376 UINT16 Word; 377 378 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0); 379 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 380 381 Word = Value; 382 InternalSmBusExec (EfiSmbusWriteWord, SmBusAddress, 2, &Word, Status); 383 384 return Value; 385 } 386 387 /** 388 Executes an SMBUS process call command. 389 390 Executes an SMBUS process call command on the SMBUS device specified by SmBusAddress. 391 The 16-bit value specified by Value is written. 392 Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required. 393 The 16-bit value returned by the process call command is returned. 394 If Status is not NULL, then the status of the executed command is returned in Status. 395 If Length in SmBusAddress is not zero, then ASSERT(). 396 If any reserved bits of SmBusAddress are set, then ASSERT(). 397 398 @param SmBusAddress The address that encodes the SMBUS Slave Address, 399 SMBUS Command, SMBUS Data Length, and PEC. 400 @param Value The 16-bit value to write. 401 @param Status Return status for the executed command. 402 This is an optional parameter and may be NULL. 403 RETURN_SUCCESS: The SMBUS command was executed. 404 RETURN_TIMEOUT: A timeout occurred while executing the 405 SMBUS command. 406 RETURN_DEVICE_ERROR: The request was not completed because 407 a failure reflected in the Host Status Register bit. 408 Device errors are a result of a transaction collision, 409 illegal command field, unclaimed cycle (host initiated), 410 or bus errors (collisions). 411 RETURN_CRC_ERROR: The checksum is not correct. (PEC is 412 incorrect.) 413 RETURN_UNSUPPORTED: The SMBus operation is not supported. 414 415 @return The 16-bit value returned by the process call command. 416 417 **/ 418 UINT16 419 EFIAPI 420 SmBusProcessCall ( 421 IN UINTN SmBusAddress, 422 IN UINT16 Value, 423 OUT RETURN_STATUS *Status OPTIONAL 424 ) 425 { 426 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0); 427 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 428 429 InternalSmBusExec (EfiSmbusProcessCall, SmBusAddress, 2, &Value, Status); 430 431 return Value; 432 } 433 434 /** 435 Executes an SMBUS read block command. 436 437 Executes an SMBUS read block command on the SMBUS device specified by SmBusAddress. 438 Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required. 439 Bytes are read from the SMBUS and stored in Buffer. 440 The number of bytes read is returned, and will never return a value larger than 32-bytes. 441 If Status is not NULL, then the status of the executed command is returned in Status. 442 It is the caller's responsibility to make sure Buffer is large enough for the total number of bytes read. 443 SMBUS supports a maximum transfer size of 32 bytes, so Buffer does not need to be any larger than 32 bytes. 444 If Length in SmBusAddress is not zero, then ASSERT(). 445 If Buffer is NULL, then ASSERT(). 446 If any reserved bits of SmBusAddress are set, then ASSERT(). 447 448 @param SmBusAddress The address that encodes the SMBUS Slave Address, 449 SMBUS Command, SMBUS Data Length, and PEC. 450 @param Buffer The pointer to the buffer to store the bytes read from 451 the SMBUS. 452 @param Status Return status for the executed command. 453 This is an optional parameter and may be NULL. 454 RETURN_SUCCESS: The SMBUS command was executed. 455 RETURN_TIMEOUT: A timeout occurred while executing the SMBUS 456 command. 457 RETURN_DEVICE_ERROR: The request was not completed because 458 a failure reflected in the Host Status Register bit. Device 459 errors are a result of a transaction collision, illegal 460 command field, unclaimed cycle (host initiated), or bus 461 errors (collisions). 462 RETURN_CRC_ERROR: The checksum is not correct. (PEC is 463 incorrect.) 464 RETURN_UNSUPPORTED: The SMBus operation is not supported. 465 466 @return The number of bytes read. 467 468 **/ 469 UINTN 470 EFIAPI 471 SmBusReadBlock ( 472 IN UINTN SmBusAddress, 473 OUT VOID *Buffer, 474 OUT RETURN_STATUS *Status OPTIONAL 475 ) 476 { 477 ASSERT (Buffer != NULL); 478 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0); 479 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 480 481 return InternalSmBusExec (EfiSmbusReadBlock, SmBusAddress, 0x20, Buffer, Status); 482 } 483 484 /** 485 Executes an SMBUS write block command. 486 487 Executes an SMBUS write block command on the SMBUS device specified by SmBusAddress. 488 The SMBUS slave address, SMBUS command, and SMBUS length fields of SmBusAddress are required. 489 Bytes are written to the SMBUS from Buffer. 490 The number of bytes written is returned, and will never return a value larger than 32-bytes. 491 If Status is not NULL, then the status of the executed command is returned in Status. 492 If Length in SmBusAddress is zero or greater than 32, then ASSERT(). 493 If Buffer is NULL, then ASSERT(). 494 If any reserved bits of SmBusAddress are set, then ASSERT(). 495 496 @param SmBusAddress The address that encodes the SMBUS Slave Address, 497 MBUS Command, SMBUS Data Length, and PEC. 498 @param Buffer The pointer to the buffer to store the bytes read from 499 the SMBUS. 500 @param Status Return status for the executed command. 501 This is an optional parameter and may be NULL. 502 RETURN_TIMEOUT: A timeout occurred while executing the 503 SMBUS command. 504 RETURN_DEVICE_ERROR: The request was not completed because 505 a failure reflected in the Host Status Register bit. Device 506 errors are a result of a transaction collision, illegal 507 command field, unclaimed cycle (host initiated), or bus 508 errors (collisions). 509 RETURN_CRC_ERROR: The checksum is not correct. (PEC is 510 incorrect.) 511 RETURN_UNSUPPORTED: The SMBus operation is not supported. 512 513 @return The number of bytes written. 514 515 **/ 516 UINTN 517 EFIAPI 518 SmBusWriteBlock ( 519 IN UINTN SmBusAddress, 520 OUT VOID *Buffer, 521 OUT RETURN_STATUS *Status OPTIONAL 522 ) 523 { 524 UINTN Length; 525 526 ASSERT (Buffer != NULL); 527 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) >= 1); 528 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) <= 32); 529 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 530 531 Length = SMBUS_LIB_LENGTH (SmBusAddress); 532 return InternalSmBusExec (EfiSmbusWriteBlock, SmBusAddress, Length, Buffer, Status); 533 } 534 535 /** 536 Executes an SMBUS block process call command. 537 538 Executes an SMBUS block process call command on the SMBUS device specified by SmBusAddress. 539 The SMBUS slave address, SMBUS command, and SMBUS length fields of SmBusAddress are required. 540 Bytes are written to the SMBUS from WriteBuffer. Bytes are then read from the SMBUS into ReadBuffer. 541 If Status is not NULL, then the status of the executed command is returned in Status. 542 It is the caller's responsibility to make sure ReadBuffer is large enough for the total number of bytes read. 543 SMBUS supports a maximum transfer size of 32 bytes, so Buffer does not need to be any larger than 32 bytes. 544 If Length in SmBusAddress is zero or greater than 32, then ASSERT(). 545 If WriteBuffer is NULL, then ASSERT(). 546 If ReadBuffer is NULL, then ASSERT(). 547 If any reserved bits of SmBusAddress are set, then ASSERT(). 548 549 @param SmBusAddress The address that encodes the SMBUS Slave Address, 550 SMBUS Command, SMBUS Data Length, and PEC. 551 @param WriteBuffer The pointer to the buffer of bytes to write to the SMBUS. 552 @param ReadBuffer The pointer to the buffer of bytes to read from the SMBUS. 553 @param Status Return status for the executed command. 554 This is an optional parameter and may be NULL. 555 RETURN_TIMEOUT: A timeout occurred while executing the 556 SMBUS command. 557 RETURN_DEVICE_ERROR: The request was not completed because 558 a failure reflected in the Host Status Register bit. Device 559 errors are a result of a transaction collision, illegal 560 command field, unclaimed cycle (host initiated), or bus 561 errors (collisions). 562 RETURN_CRC_ERROR: The checksum is not correct. (PEC is 563 incorrect.) 564 RETURN_UNSUPPORTED: The SMBus operation is not supported. 565 566 @return The number of bytes written. 567 568 **/ 569 UINTN 570 EFIAPI 571 SmBusBlockProcessCall ( 572 IN UINTN SmBusAddress, 573 IN VOID *WriteBuffer, 574 OUT VOID *ReadBuffer, 575 OUT RETURN_STATUS *Status OPTIONAL 576 ) 577 { 578 UINTN Length; 579 580 ASSERT (WriteBuffer != NULL); 581 ASSERT (ReadBuffer != NULL); 582 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) >= 1); 583 ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) <= 32); 584 ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0); 585 586 Length = SMBUS_LIB_LENGTH (SmBusAddress); 587 // 588 // Assuming that ReadBuffer is large enough to save another memory copy. 589 // 590 ReadBuffer = CopyMem (ReadBuffer, WriteBuffer, Length); 591 return InternalSmBusExec (EfiSmbusBWBRProcessCall, SmBusAddress, Length, ReadBuffer, Status); 592 } 593
