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1 | /** @file\r |
2 | Null implementation of SmBusLib class library.\r | |
3 | \r | |
4 | Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php.\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include <Base.h>\r | |
16 | #include <Library/SmbusLib.h>\r | |
17 | #include <Library/DebugLib.h>\r | |
18 | \r | |
19 | /**\r | |
20 | Executes an SMBUS quick read command.\r | |
21 | \r | |
22 | Executes an SMBUS quick read command on the SMBUS device specified by SmBusAddress.\r | |
23 | Only the SMBUS slave address field of SmBusAddress is required.\r | |
24 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
25 | If PEC is set in SmBusAddress, then ASSERT().\r | |
26 | If Command in SmBusAddress is not zero, then ASSERT().\r | |
27 | If Length in SmBusAddress is not zero, then ASSERT().\r | |
28 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
29 | \r | |
30 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
31 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
32 | @param Status Return status for the executed command.\r | |
33 | This is an optional parameter and may be NULL.\r | |
34 | RETURN_SUCCESS The SMBUS command was executed.\r | |
35 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
36 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
37 | reflected in the Host Status Register bit. Device errors are a result\r | |
38 | of a transaction collision, illegal command field, unclaimed cycle\r | |
39 | (host initiated), or bus errors (collisions).\r | |
40 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
41 | \r | |
42 | **/\r | |
43 | VOID\r | |
44 | EFIAPI\r | |
45 | SmBusQuickRead (\r | |
46 | IN UINTN SmBusAddress,\r | |
47 | OUT RETURN_STATUS *Status OPTIONAL\r | |
48 | )\r | |
49 | {\r | |
50 | ASSERT (!SMBUS_LIB_PEC (SmBusAddress));\r | |
51 | ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0);\r | |
52 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);\r | |
53 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
54 | if (Status != NULL) {\r | |
55 | *Status = RETURN_UNSUPPORTED;\r | |
56 | }\r | |
57 | }\r | |
58 | \r | |
59 | /**\r | |
60 | Executes an SMBUS quick write command.\r | |
61 | \r | |
62 | Executes an SMBUS quick write command on the SMBUS device specified by SmBusAddress.\r | |
63 | Only the SMBUS slave address field of SmBusAddress is required.\r | |
64 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
65 | If PEC is set in SmBusAddress, then ASSERT().\r | |
66 | If Command in SmBusAddress is not zero, then ASSERT().\r | |
67 | If Length in SmBusAddress is not zero, then ASSERT().\r | |
68 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
69 | \r | |
70 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
71 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
72 | @param Status Return status for the executed command.\r | |
73 | This is an optional parameter and may be NULL.\r | |
74 | RETURN_SUCCESS The SMBUS command was executed.\r | |
75 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
76 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
77 | reflected in the Host Status Register bit. Device errors are a result\r | |
78 | of a transaction collision, illegal command field, unclaimed cycle\r | |
79 | (host initiated), or bus errors (collisions).\r | |
80 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
81 | \r | |
82 | **/\r | |
83 | VOID\r | |
84 | EFIAPI\r | |
85 | SmBusQuickWrite (\r | |
86 | IN UINTN SmBusAddress,\r | |
87 | OUT RETURN_STATUS *Status OPTIONAL\r | |
88 | )\r | |
89 | {\r | |
90 | ASSERT (!SMBUS_LIB_PEC (SmBusAddress));\r | |
91 | ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0);\r | |
92 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);\r | |
93 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
94 | if (Status != NULL) {\r | |
95 | *Status = RETURN_UNSUPPORTED;\r | |
96 | }\r | |
97 | }\r | |
98 | \r | |
99 | /**\r | |
100 | Executes an SMBUS receive byte command.\r | |
101 | \r | |
102 | Executes an SMBUS receive byte command on the SMBUS device specified by SmBusAddress.\r | |
103 | Only the SMBUS slave address field of SmBusAddress is required.\r | |
104 | The byte received from the SMBUS is returned.\r | |
105 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
106 | If Command in SmBusAddress is not zero, then ASSERT().\r | |
107 | If Length in SmBusAddress is not zero, then ASSERT().\r | |
108 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
109 | \r | |
110 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
111 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
112 | @param Status Return status for the executed command.\r | |
113 | This is an optional parameter and may be NULL.\r | |
114 | RETURN_SUCCESS The SMBUS command was executed.\r | |
115 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
116 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
117 | reflected in the Host Status Register bit. Device errors are a result\r | |
118 | of a transaction collision, illegal command field, unclaimed cycle\r | |
119 | (host initiated), or bus errors (collisions).\r | |
120 | RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect)\r | |
121 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
122 | \r | |
123 | @return The byte received from the SMBUS.\r | |
124 | \r | |
125 | **/\r | |
126 | UINT8\r | |
127 | EFIAPI\r | |
128 | SmBusReceiveByte (\r | |
129 | IN UINTN SmBusAddress,\r | |
130 | OUT RETURN_STATUS *Status OPTIONAL\r | |
131 | )\r | |
132 | {\r | |
133 | ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0);\r | |
134 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);\r | |
135 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
136 | if (Status != NULL) {\r | |
137 | *Status = RETURN_UNSUPPORTED;\r | |
138 | }\r | |
139 | return 0;\r | |
140 | }\r | |
141 | \r | |
142 | /**\r | |
143 | Executes an SMBUS send byte command.\r | |
144 | \r | |
145 | Executes an SMBUS send byte command on the SMBUS device specified by SmBusAddress.\r | |
146 | The byte specified by Value is sent.\r | |
147 | Only the SMBUS slave address field of SmBusAddress is required. Value is returned.\r | |
148 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
149 | If Command in SmBusAddress is not zero, then ASSERT().\r | |
150 | If Length in SmBusAddress is not zero, then ASSERT().\r | |
151 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
152 | \r | |
153 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
154 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
155 | @param Value The 8-bit value to send.\r | |
156 | @param Status Return status for the executed command.\r | |
157 | This is an optional parameter and may be NULL.\r | |
158 | RETURN_SUCCESS The SMBUS command was executed.\r | |
159 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
160 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
161 | reflected in the Host Status Register bit. Device errors are a result\r | |
162 | of a transaction collision, illegal command field, unclaimed cycle\r | |
163 | (host initiated), or bus errors (collisions).\r | |
164 | RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect)\r | |
165 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
166 | \r | |
167 | @return The parameter of Value.\r | |
168 | \r | |
169 | **/\r | |
170 | UINT8\r | |
171 | EFIAPI\r | |
172 | SmBusSendByte (\r | |
173 | IN UINTN SmBusAddress,\r | |
174 | IN UINT8 Value,\r | |
175 | OUT RETURN_STATUS *Status OPTIONAL\r | |
176 | )\r | |
177 | {\r | |
178 | ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0);\r | |
179 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);\r | |
180 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
181 | if (Status != NULL) {\r | |
182 | *Status = RETURN_UNSUPPORTED;\r | |
183 | }\r | |
184 | return 0;\r | |
185 | }\r | |
186 | \r | |
187 | /**\r | |
188 | Executes an SMBUS read data byte command.\r | |
189 | \r | |
190 | Executes an SMBUS read data byte command on the SMBUS device specified by SmBusAddress.\r | |
191 | Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.\r | |
192 | The 8-bit value read from the SMBUS is returned.\r | |
193 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
194 | If Length in SmBusAddress is not zero, then ASSERT().\r | |
195 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
196 | \r | |
197 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
198 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
199 | @param Status Return status for the executed command.\r | |
200 | This is an optional parameter and may be NULL.\r | |
201 | RETURN_SUCCESS The SMBUS command was executed.\r | |
202 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
203 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
204 | reflected in the Host Status Register bit. Device errors are a result\r | |
205 | of a transaction collision, illegal command field, unclaimed cycle\r | |
206 | (host initiated), or bus errors (collisions).\r | |
207 | RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect)\r | |
208 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
209 | \r | |
210 | @return The byte read from the SMBUS.\r | |
211 | \r | |
212 | **/\r | |
213 | UINT8\r | |
214 | EFIAPI\r | |
215 | SmBusReadDataByte (\r | |
216 | IN UINTN SmBusAddress,\r | |
217 | OUT RETURN_STATUS *Status OPTIONAL\r | |
218 | )\r | |
219 | {\r | |
220 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);\r | |
221 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
222 | if (Status != NULL) {\r | |
223 | *Status = RETURN_UNSUPPORTED;\r | |
224 | }\r | |
225 | return 0;\r | |
226 | }\r | |
227 | \r | |
228 | /**\r | |
229 | Executes an SMBUS write data byte command.\r | |
230 | \r | |
231 | Executes an SMBUS write data byte command on the SMBUS device specified by SmBusAddress.\r | |
232 | The 8-bit value specified by Value is written.\r | |
233 | Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.\r | |
234 | Value is returned.\r | |
235 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
236 | If Length in SmBusAddress is not zero, then ASSERT().\r | |
237 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
238 | \r | |
239 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
240 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
241 | @param Value The 8-bit value to write.\r | |
242 | @param Status Return status for the executed command.\r | |
243 | This is an optional parameter and may be NULL.\r | |
244 | RETURN_SUCCESS The SMBUS command was executed.\r | |
245 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
246 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
247 | reflected in the Host Status Register bit. Device errors are a result\r | |
248 | of a transaction collision, illegal command field, unclaimed cycle\r | |
249 | (host initiated), or bus errors (collisions).\r | |
250 | RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect)\r | |
251 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
252 | \r | |
253 | @return The parameter of Value.\r | |
254 | \r | |
255 | **/\r | |
256 | UINT8\r | |
257 | EFIAPI\r | |
258 | SmBusWriteDataByte (\r | |
259 | IN UINTN SmBusAddress,\r | |
260 | IN UINT8 Value,\r | |
261 | OUT RETURN_STATUS *Status OPTIONAL\r | |
262 | )\r | |
263 | {\r | |
264 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);\r | |
265 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
266 | if (Status != NULL) {\r | |
267 | *Status = RETURN_UNSUPPORTED;\r | |
268 | }\r | |
269 | return 0;\r | |
270 | }\r | |
271 | \r | |
272 | /**\r | |
273 | Executes an SMBUS read data word command.\r | |
274 | \r | |
275 | Executes an SMBUS read data word command on the SMBUS device specified by SmBusAddress.\r | |
276 | Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.\r | |
277 | The 16-bit value read from the SMBUS is returned.\r | |
278 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
279 | If Length in SmBusAddress is not zero, then ASSERT().\r | |
280 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
281 | \r | |
282 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
283 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
284 | @param Status Return status for the executed command.\r | |
285 | This is an optional parameter and may be NULL.\r | |
286 | RETURN_SUCCESS The SMBUS command was executed.\r | |
287 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
288 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
289 | reflected in the Host Status Register bit. Device errors are a result\r | |
290 | of a transaction collision, illegal command field, unclaimed cycle\r | |
291 | (host initiated), or bus errors (collisions).\r | |
292 | RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect)\r | |
293 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
294 | \r | |
295 | @return The byte read from the SMBUS.\r | |
296 | \r | |
297 | **/\r | |
298 | UINT16\r | |
299 | EFIAPI\r | |
300 | SmBusReadDataWord (\r | |
301 | IN UINTN SmBusAddress,\r | |
302 | OUT RETURN_STATUS *Status OPTIONAL\r | |
303 | )\r | |
304 | {\r | |
305 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);\r | |
306 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
307 | if (Status != NULL) {\r | |
308 | *Status = RETURN_UNSUPPORTED;\r | |
309 | }\r | |
310 | return 0;\r | |
311 | }\r | |
312 | \r | |
313 | /**\r | |
314 | Executes an SMBUS write data word command.\r | |
315 | \r | |
316 | Executes an SMBUS write data word command on the SMBUS device specified by SmBusAddress.\r | |
317 | The 16-bit value specified by Value is written.\r | |
318 | Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.\r | |
319 | Value is returned.\r | |
320 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
321 | If Length in SmBusAddress is not zero, then ASSERT().\r | |
322 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
323 | \r | |
324 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
325 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
326 | @param Value The 16-bit value to write.\r | |
327 | @param Status Return status for the executed command.\r | |
328 | This is an optional parameter and may be NULL.\r | |
329 | RETURN_SUCCESS The SMBUS command was executed.\r | |
330 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
331 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
332 | reflected in the Host Status Register bit. Device errors are a result\r | |
333 | of a transaction collision, illegal command field, unclaimed cycle\r | |
334 | (host initiated), or bus errors (collisions).\r | |
335 | RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect)\r | |
336 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
337 | \r | |
338 | @return The parameter of Value.\r | |
339 | \r | |
340 | **/\r | |
341 | UINT16\r | |
342 | EFIAPI\r | |
343 | SmBusWriteDataWord (\r | |
344 | IN UINTN SmBusAddress,\r | |
345 | IN UINT16 Value,\r | |
346 | OUT RETURN_STATUS *Status OPTIONAL\r | |
347 | )\r | |
348 | {\r | |
349 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);\r | |
350 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
351 | if (Status != NULL) {\r | |
352 | *Status = RETURN_UNSUPPORTED;\r | |
353 | }\r | |
354 | return 0;\r | |
355 | }\r | |
356 | \r | |
357 | /**\r | |
358 | Executes an SMBUS process call command.\r | |
359 | \r | |
360 | Executes an SMBUS process call command on the SMBUS device specified by SmBusAddress.\r | |
361 | The 16-bit value specified by Value is written.\r | |
362 | Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.\r | |
363 | The 16-bit value returned by the process call command is returned.\r | |
364 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
365 | If Length in SmBusAddress is not zero, then ASSERT().\r | |
366 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
367 | \r | |
368 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
369 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
370 | @param Value The 16-bit value to write.\r | |
371 | @param Status Return status for the executed command.\r | |
372 | This is an optional parameter and may be NULL.\r | |
373 | RETURN_SUCCESS The SMBUS command was executed.\r | |
374 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
375 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
376 | reflected in the Host Status Register bit. Device errors are a result\r | |
377 | of a transaction collision, illegal command field, unclaimed cycle\r | |
378 | (host initiated), or bus errors (collisions).\r | |
379 | RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect)\r | |
380 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
381 | \r | |
382 | @return The 16-bit value returned by the process call command.\r | |
383 | \r | |
384 | **/\r | |
385 | UINT16\r | |
386 | EFIAPI\r | |
387 | SmBusProcessCall (\r | |
388 | IN UINTN SmBusAddress,\r | |
389 | IN UINT16 Value,\r | |
390 | OUT RETURN_STATUS *Status OPTIONAL\r | |
391 | )\r | |
392 | {\r | |
393 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);\r | |
394 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
395 | if (Status != NULL) {\r | |
396 | *Status = RETURN_UNSUPPORTED;\r | |
397 | }\r | |
398 | return 0;\r | |
399 | }\r | |
400 | \r | |
401 | /**\r | |
402 | Executes an SMBUS read block command.\r | |
403 | \r | |
404 | Executes an SMBUS read block command on the SMBUS device specified by SmBusAddress.\r | |
405 | Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.\r | |
406 | Bytes are read from the SMBUS and stored in Buffer.\r | |
407 | The number of bytes read is returned, and will never return a value larger than 32-bytes.\r | |
408 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
409 | It is the caller's responsibility to make sure Buffer is large enough for the total number of bytes read.\r | |
410 | SMBUS supports a maximum transfer size of 32 bytes, so Buffer does not need to be any larger than 32 bytes.\r | |
411 | If Length in SmBusAddress is not zero, then ASSERT().\r | |
412 | If Buffer is NULL, then ASSERT().\r | |
413 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
414 | \r | |
415 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
416 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
417 | @param Buffer Pointer to the buffer to store the bytes read from the SMBUS.\r | |
418 | @param Status Return status for the executed command.\r | |
419 | This is an optional parameter and may be NULL.\r | |
420 | RETURN_SUCCESS The SMBUS command was executed.\r | |
421 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
422 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
423 | reflected in the Host Status Register bit. Device errors are a result\r | |
424 | of a transaction collision, illegal command field, unclaimed cycle\r | |
425 | (host initiated), or bus errors (collisions).\r | |
426 | RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect)\r | |
427 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
428 | \r | |
429 | @return The number of bytes read.\r | |
430 | \r | |
431 | **/\r | |
432 | UINTN\r | |
433 | EFIAPI\r | |
434 | SmBusReadBlock (\r | |
435 | IN UINTN SmBusAddress,\r | |
436 | OUT VOID *Buffer,\r | |
437 | OUT RETURN_STATUS *Status OPTIONAL\r | |
438 | )\r | |
439 | {\r | |
440 | ASSERT (Buffer != NULL);\r | |
441 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);\r | |
442 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
443 | if (Status != NULL) {\r | |
444 | *Status = RETURN_UNSUPPORTED;\r | |
445 | }\r | |
446 | return 0;\r | |
447 | }\r | |
448 | \r | |
449 | /**\r | |
450 | Executes an SMBUS write block command.\r | |
451 | \r | |
452 | Executes an SMBUS write block command on the SMBUS device specified by SmBusAddress.\r | |
453 | The SMBUS slave address, SMBUS command, and SMBUS length fields of SmBusAddress are required.\r | |
454 | Bytes are written to the SMBUS from Buffer.\r | |
455 | The number of bytes written is returned, and will never return a value larger than 32-bytes.\r | |
456 | If Status is not NULL, then the status of the executed command is returned in Status. \r | |
457 | If Length in SmBusAddress is zero or greater than 32, then ASSERT().\r | |
458 | If Buffer is NULL, then ASSERT().\r | |
459 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
460 | \r | |
461 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
462 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
463 | @param Buffer Pointer to the buffer to store the bytes read from the SMBUS.\r | |
464 | @param Status Return status for the executed command.\r | |
465 | This is an optional parameter and may be NULL.\r | |
466 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
467 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
468 | reflected in the Host Status Register bit. Device errors are a result\r | |
469 | of a transaction collision, illegal command field, unclaimed cycle\r | |
470 | (host initiated), or bus errors (collisions).\r | |
471 | RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect)\r | |
472 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
473 | \r | |
474 | @return The number of bytes written.\r | |
475 | \r | |
476 | **/\r | |
477 | UINTN\r | |
478 | EFIAPI\r | |
479 | SmBusWriteBlock (\r | |
480 | IN UINTN SmBusAddress,\r | |
481 | OUT VOID *Buffer,\r | |
482 | OUT RETURN_STATUS *Status OPTIONAL\r | |
483 | )\r | |
484 | {\r | |
485 | ASSERT (Buffer != NULL);\r | |
486 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) >= 1);\r | |
487 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) <= 32);\r | |
488 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
489 | if (Status != NULL) {\r | |
490 | *Status = RETURN_UNSUPPORTED;\r | |
491 | }\r | |
492 | return 0;\r | |
493 | }\r | |
494 | \r | |
495 | /**\r | |
496 | Executes an SMBUS block process call command.\r | |
497 | \r | |
498 | Executes an SMBUS block process call command on the SMBUS device specified by SmBusAddress.\r | |
499 | The SMBUS slave address, SMBUS command, and SMBUS length fields of SmBusAddress are required.\r | |
500 | Bytes are written to the SMBUS from WriteBuffer. Bytes are then read from the SMBUS into ReadBuffer.\r | |
501 | If Status is not NULL, then the status of the executed command is returned in Status.\r | |
502 | It is the caller's responsibility to make sure ReadBuffer is large enough for the total number of bytes read.\r | |
503 | SMBUS supports a maximum transfer size of 32 bytes, so Buffer does not need to be any larger than 32 bytes.\r | |
504 | If Length in SmBusAddress is zero or greater than 32, then ASSERT().\r | |
505 | If WriteBuffer is NULL, then ASSERT().\r | |
506 | If ReadBuffer is NULL, then ASSERT().\r | |
507 | If any reserved bits of SmBusAddress are set, then ASSERT().\r | |
508 | \r | |
509 | @param SmBusAddress Address that encodes the SMBUS Slave Address,\r | |
510 | SMBUS Command, SMBUS Data Length, and PEC.\r | |
511 | @param WriteBuffer Pointer to the buffer of bytes to write to the SMBUS.\r | |
512 | @param ReadBuffer Pointer to the buffer of bytes to read from the SMBUS.\r | |
513 | @param Status Return status for the executed command.\r | |
514 | This is an optional parameter and may be NULL.\r | |
515 | RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.\r | |
516 | RETURN_DEVICE_ERROR The request was not completed because a failure\r | |
517 | reflected in the Host Status Register bit. Device errors are a result\r | |
518 | of a transaction collision, illegal command field, unclaimed cycle\r | |
519 | (host initiated), or bus errors (collisions).\r | |
520 | RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect)\r | |
521 | RETURN_UNSUPPORTED The SMBus operation is not supported.\r | |
522 | \r | |
523 | @return The number of bytes written.\r | |
524 | \r | |
525 | **/\r | |
526 | UINTN\r | |
527 | EFIAPI\r | |
528 | SmBusBlockProcessCall (\r | |
529 | IN UINTN SmBusAddress,\r | |
530 | IN VOID *WriteBuffer,\r | |
531 | OUT VOID *ReadBuffer,\r | |
532 | OUT RETURN_STATUS *Status OPTIONAL\r | |
533 | )\r | |
534 | {\r | |
535 | ASSERT (WriteBuffer != NULL);\r | |
536 | ASSERT (ReadBuffer != NULL);\r | |
537 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) >= 1);\r | |
538 | ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) <= 32);\r | |
539 | ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);\r | |
540 | if (Status != NULL) {\r | |
541 | *Status = RETURN_UNSUPPORTED;\r | |
542 | }\r | |
543 | return 0;\r | |
544 | }\r |