Commit | Line | Data |
---|---|---|
7f15b664 M |
1 | Kernel driver lm90 |
2 | ================== | |
3 | ||
4 | Supported chips: | |
b04f2f7d | 5 | |
c09472fc GR |
6 | * National Semiconductor LM84 |
7 | ||
8 | Prefix: 'lm84' | |
9 | ||
10 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
11 | ||
12 | Datasheet: Publicly available at the National Semiconductor website | |
13 | ||
7f15b664 | 14 | * National Semiconductor LM90 |
b04f2f7d | 15 | |
7f15b664 | 16 | Prefix: 'lm90' |
b04f2f7d | 17 | |
7f15b664 | 18 | Addresses scanned: I2C 0x4c |
b04f2f7d | 19 | |
7f15b664 | 20 | Datasheet: Publicly available at the National Semiconductor website |
b04f2f7d MCC |
21 | |
22 | http://www.national.com/pf/LM/LM90.html | |
23 | ||
7f15b664 | 24 | * National Semiconductor LM89 |
b04f2f7d | 25 | |
97ae60bb | 26 | Prefix: 'lm89' (no auto-detection) |
b04f2f7d | 27 | |
7f15b664 | 28 | Addresses scanned: I2C 0x4c and 0x4d |
b04f2f7d | 29 | |
7f15b664 | 30 | Datasheet: Publicly available at the National Semiconductor website |
b04f2f7d MCC |
31 | |
32 | http://www.national.com/mpf/LM/LM89.html | |
33 | ||
7f15b664 | 34 | * National Semiconductor LM99 |
b04f2f7d | 35 | |
7f15b664 | 36 | Prefix: 'lm99' |
b04f2f7d | 37 | |
7f15b664 | 38 | Addresses scanned: I2C 0x4c and 0x4d |
b04f2f7d | 39 | |
7f15b664 | 40 | Datasheet: Publicly available at the National Semiconductor website |
b04f2f7d MCC |
41 | |
42 | http://www.national.com/pf/LM/LM99.html | |
43 | ||
7f15b664 | 44 | * National Semiconductor LM86 |
b04f2f7d | 45 | |
7f15b664 | 46 | Prefix: 'lm86' |
b04f2f7d | 47 | |
7f15b664 | 48 | Addresses scanned: I2C 0x4c |
b04f2f7d | 49 | |
7f15b664 | 50 | Datasheet: Publicly available at the National Semiconductor website |
b04f2f7d MCC |
51 | |
52 | http://www.national.com/mpf/LM/LM86.html | |
53 | ||
f63f6cce GR |
54 | * Analog Devices ADM1020 |
55 | ||
56 | Prefix: 'adm1020' | |
57 | ||
58 | Addresses scanned: I2C 0x4c - 0x4e | |
59 | ||
60 | Datasheet: Publicly available at the Analog Devices website | |
61 | ||
0c6bffd4 GR |
62 | * Analog Devices ADM1021 |
63 | ||
64 | Prefix: 'adm1021' | |
65 | ||
66 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
67 | ||
68 | Datasheet: Publicly available at the Analog Devices website | |
69 | ||
70 | * Analog Devices ADM1021A/ADM1023 | |
71 | ||
72 | Prefix: 'adm1023' | |
73 | ||
74 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
75 | ||
76 | Datasheet: Publicly available at the Analog Devices website | |
77 | ||
7f15b664 | 78 | * Analog Devices ADM1032 |
b04f2f7d | 79 | |
7f15b664 | 80 | Prefix: 'adm1032' |
b04f2f7d | 81 | |
90209b42 | 82 | Addresses scanned: I2C 0x4c and 0x4d |
b04f2f7d | 83 | |
a874a10c | 84 | Datasheet: Publicly available at the ON Semiconductor website |
b04f2f7d | 85 | |
6c7b66be | 86 | https://www.onsemi.com/PowerSolutions/product.do?id=ADM1032 |
b04f2f7d | 87 | |
7f15b664 | 88 | * Analog Devices ADT7461 |
b04f2f7d | 89 | |
7f15b664 | 90 | Prefix: 'adt7461' |
b04f2f7d | 91 | |
90209b42 | 92 | Addresses scanned: I2C 0x4c and 0x4d |
b04f2f7d | 93 | |
a874a10c | 94 | Datasheet: Publicly available at the ON Semiconductor website |
b04f2f7d | 95 | |
6c7b66be | 96 | https://www.onsemi.com/PowerSolutions/product.do?id=ADT7461 |
b04f2f7d | 97 | |
5a4e5e6a | 98 | * Analog Devices ADT7461A |
b04f2f7d | 99 | |
5a4e5e6a | 100 | Prefix: 'adt7461a' |
b04f2f7d | 101 | |
5a4e5e6a | 102 | Addresses scanned: I2C 0x4c and 0x4d |
b04f2f7d | 103 | |
5a4e5e6a | 104 | Datasheet: Publicly available at the ON Semiconductor website |
b04f2f7d | 105 | |
6c7b66be | 106 | https://www.onsemi.com/PowerSolutions/product.do?id=ADT7461A |
b04f2f7d | 107 | |
a9f3d3a8 GR |
108 | * Analog Devices ADT7481 |
109 | ||
110 | Prefix: 'adt7481' | |
111 | ||
112 | Addresses scanned: I2C 0x4b and 0x4c | |
113 | ||
114 | Datasheet: Publicly available at the ON Semiconductor website | |
115 | ||
116 | https://www.onsemi.com/PowerSolutions/product.do?id=ADT7481 | |
117 | ||
118 | * Analog Devices ADT7482 | |
119 | ||
120 | Prefix: 'adt7482' | |
121 | ||
122 | Addresses scanned: I2C 0x4c | |
123 | ||
124 | Datasheet: Publicly available at the ON Semiconductor website | |
125 | ||
126 | https://www.onsemi.com/PowerSolutions/product.do?id=ADT7482 | |
127 | ||
128 | * Analog Devices ADT7483A | |
129 | ||
130 | Prefix: 'adt7483a' | |
131 | ||
132 | Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e | |
133 | ||
134 | Datasheet: Publicly available at the ON Semiconductor website | |
135 | ||
136 | https://www.onsemi.com/PowerSolutions/product.do?id=ADT7483A | |
137 | ||
5a4e5e6a | 138 | * ON Semiconductor NCT1008 |
b04f2f7d | 139 | |
5a4e5e6a | 140 | Prefix: 'nct1008' |
b04f2f7d | 141 | |
5a4e5e6a | 142 | Addresses scanned: I2C 0x4c and 0x4d |
b04f2f7d | 143 | |
5a4e5e6a | 144 | Datasheet: Publicly available at the ON Semiconductor website |
b04f2f7d | 145 | |
6c7b66be | 146 | https://www.onsemi.com/PowerSolutions/product.do?id=NCT1008 |
b04f2f7d | 147 | |
af4540b1 GR |
148 | * ON Semiconductor NCT210 |
149 | ||
150 | Prefix: 'adm1021' | |
151 | ||
152 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
153 | ||
154 | Datasheet: Publicly available at the ON Semiconductor website | |
155 | ||
156 | https://www.onsemi.com/PowerSolutions/product.do?id=NCT210 | |
157 | ||
2c6cb6c5 GR |
158 | * ON Semiconductor NCT214 |
159 | ||
160 | Prefix: 'nct214' | |
161 | ||
162 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
163 | ||
164 | Datasheet: Publicly available at the ON Semiconductor website | |
165 | ||
166 | https://www.onsemi.com/PowerSolutions/product.do?id=NCT214 | |
167 | ||
d8521f82 GR |
168 | * ON Semiconductor NCT218 |
169 | ||
170 | Prefix: 'nct218' | |
171 | ||
172 | Addresses scanned: I2C 0x4c - 0x4d | |
173 | ||
174 | Datasheet: Publicly available at the ON Semiconductor website | |
175 | ||
176 | https://www.onsemi.com/PowerSolutions/product.do?id=NCT218 | |
177 | ||
2c6cb6c5 GR |
178 | * ON Semiconductor NCT72 |
179 | ||
180 | Prefix: 'nct72' | |
181 | ||
182 | Addresses scanned: I2C 0x4c - 0x4d | |
183 | ||
184 | Datasheet: Publicly available at the ON Semiconductor website | |
185 | ||
186 | https://www.onsemi.com/PowerSolutions/product.do?id=NCT72 | |
187 | ||
c09472fc GR |
188 | * Maxim MAX1617 |
189 | ||
190 | Prefix: 'max1617' | |
191 | ||
192 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
193 | ||
194 | Datasheet: Publicly available at the Maxim website | |
195 | ||
196 | * Maxim MAX1617A | |
197 | ||
198 | Prefix: 'max1617a' | |
199 | ||
200 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
201 | ||
202 | Datasheet: Publicly available at the Maxim website | |
203 | ||
3c1ecccb GR |
204 | * Maxim MAX6642 |
205 | ||
206 | Prefix: 'max6642' | |
207 | ||
208 | Addresses scanned: I2C 0x48-0x4f | |
209 | ||
210 | Datasheet: Publicly available at the Maxim website | |
211 | ||
212 | http://datasheets.maxim-ic.com/en/ds/MAX6642.pdf | |
213 | ||
271dabf5 | 214 | * Maxim MAX6646 |
b04f2f7d | 215 | |
271dabf5 | 216 | Prefix: 'max6646' |
b04f2f7d | 217 | |
271dabf5 | 218 | Addresses scanned: I2C 0x4d |
b04f2f7d | 219 | |
271dabf5 | 220 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
221 | |
222 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3497 | |
223 | ||
271dabf5 | 224 | * Maxim MAX6647 |
b04f2f7d | 225 | |
271dabf5 | 226 | Prefix: 'max6646' |
b04f2f7d | 227 | |
271dabf5 | 228 | Addresses scanned: I2C 0x4e |
b04f2f7d | 229 | |
271dabf5 | 230 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
231 | |
232 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3497 | |
233 | ||
1a51e068 | 234 | * Maxim MAX6648 |
b04f2f7d | 235 | |
904a6fe6 | 236 | Prefix: 'max6648' |
b04f2f7d | 237 | |
1a51e068 | 238 | Addresses scanned: I2C 0x4c |
b04f2f7d | 239 | |
1a51e068 | 240 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
241 | |
242 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3500 | |
243 | ||
271dabf5 | 244 | * Maxim MAX6649 |
b04f2f7d | 245 | |
271dabf5 | 246 | Prefix: 'max6646' |
b04f2f7d | 247 | |
271dabf5 | 248 | Addresses scanned: I2C 0x4c |
b04f2f7d | 249 | |
271dabf5 | 250 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
251 | |
252 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3497 | |
253 | ||
229d495d JL |
254 | * Maxim MAX6654 |
255 | ||
256 | Prefix: 'max6654' | |
257 | ||
258 | Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, | |
259 | ||
260 | 0x4c, 0x4d and 0x4e | |
261 | ||
262 | Datasheet: Publicly available at the Maxim website | |
263 | ||
264 | https://www.maximintegrated.com/en/products/sensors/MAX6654.html | |
265 | ||
7f15b664 | 266 | * Maxim MAX6657 |
b04f2f7d | 267 | |
7f15b664 | 268 | Prefix: 'max6657' |
b04f2f7d | 269 | |
7f15b664 | 270 | Addresses scanned: I2C 0x4c |
b04f2f7d | 271 | |
7f15b664 | 272 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
273 | |
274 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578 | |
275 | ||
7f15b664 | 276 | * Maxim MAX6658 |
b04f2f7d | 277 | |
7f15b664 | 278 | Prefix: 'max6657' |
b04f2f7d | 279 | |
7f15b664 | 280 | Addresses scanned: I2C 0x4c |
b04f2f7d | 281 | |
7f15b664 | 282 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
283 | |
284 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578 | |
285 | ||
7f15b664 | 286 | * Maxim MAX6659 |
b04f2f7d | 287 | |
13c84951 | 288 | Prefix: 'max6659' |
b04f2f7d | 289 | |
13c84951 | 290 | Addresses scanned: I2C 0x4c, 0x4d, 0x4e |
b04f2f7d | 291 | |
7f15b664 | 292 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
293 | |
294 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578 | |
295 | ||
32c82a93 | 296 | * Maxim MAX6680 |
b04f2f7d | 297 | |
32c82a93 | 298 | Prefix: 'max6680' |
b04f2f7d | 299 | |
32c82a93 | 300 | Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, |
b04f2f7d MCC |
301 | |
302 | 0x4c, 0x4d and 0x4e | |
303 | ||
32c82a93 | 304 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
305 | |
306 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3370 | |
307 | ||
32c82a93 | 308 | * Maxim MAX6681 |
b04f2f7d | 309 | |
32c82a93 | 310 | Prefix: 'max6680' |
b04f2f7d | 311 | |
32c82a93 | 312 | Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, |
b04f2f7d MCC |
313 | |
314 | 0x4c, 0x4d and 0x4e | |
315 | ||
32c82a93 | 316 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
317 | |
318 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3370 | |
319 | ||
1a51e068 | 320 | * Maxim MAX6692 |
b04f2f7d | 321 | |
904a6fe6 | 322 | Prefix: 'max6648' |
b04f2f7d | 323 | |
1a51e068 | 324 | Addresses scanned: I2C 0x4c |
b04f2f7d | 325 | |
1a51e068 | 326 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
327 | |
328 | http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3500 | |
329 | ||
06e1c0a2 | 330 | * Maxim MAX6695 |
b04f2f7d | 331 | |
06e1c0a2 | 332 | Prefix: 'max6695' |
b04f2f7d | 333 | |
06e1c0a2 | 334 | Addresses scanned: I2C 0x18 |
b04f2f7d | 335 | |
06e1c0a2 | 336 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
337 | |
338 | http://www.maxim-ic.com/datasheet/index.mvp/id/4199 | |
339 | ||
06e1c0a2 | 340 | * Maxim MAX6696 |
b04f2f7d | 341 | |
06e1c0a2 | 342 | Prefix: 'max6695' |
b04f2f7d | 343 | |
06e1c0a2 | 344 | Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, |
b04f2f7d MCC |
345 | |
346 | 0x4c, 0x4d and 0x4e | |
347 | ||
06e1c0a2 | 348 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
349 | |
350 | http://www.maxim-ic.com/datasheet/index.mvp/id/4199 | |
351 | ||
c4f99a2b | 352 | * Winbond/Nuvoton W83L771W/G |
b04f2f7d | 353 | |
c4f99a2b | 354 | Prefix: 'w83l771' |
b04f2f7d | 355 | |
c4f99a2b | 356 | Addresses scanned: I2C 0x4c |
b04f2f7d | 357 | |
c4f99a2b | 358 | Datasheet: No longer available |
b04f2f7d | 359 | |
6771ea1f | 360 | * Winbond/Nuvoton W83L771AWG/ASG |
b04f2f7d | 361 | |
6771ea1f | 362 | Prefix: 'w83l771' |
b04f2f7d | 363 | |
6771ea1f | 364 | Addresses scanned: I2C 0x4c |
b04f2f7d | 365 | |
6771ea1f | 366 | Datasheet: Not publicly available, can be requested from Nuvoton |
b04f2f7d | 367 | |
2ef01793 | 368 | * Philips/NXP SA56004X |
b04f2f7d | 369 | |
2ef01793 | 370 | Prefix: 'sa56004' |
b04f2f7d | 371 | |
2ef01793 | 372 | Addresses scanned: I2C 0x48 through 0x4F |
b04f2f7d | 373 | |
2ef01793 | 374 | Datasheet: Publicly available at NXP website |
b04f2f7d MCC |
375 | |
376 | http://ics.nxp.com/products/interface/datasheet/sa56004x.pdf | |
377 | ||
ae544f64 | 378 | * GMT G781 |
b04f2f7d | 379 | |
ae544f64 | 380 | Prefix: 'g781' |
b04f2f7d | 381 | |
ae544f64 | 382 | Addresses scanned: I2C 0x4c, 0x4d |
b04f2f7d | 383 | |
ae544f64 | 384 | Datasheet: Not publicly available from GMT |
b04f2f7d | 385 | |
1daaceb2 | 386 | * Texas Instruments TMP451 |
b04f2f7d | 387 | |
1daaceb2 | 388 | Prefix: 'tmp451' |
b04f2f7d | 389 | |
1daaceb2 | 390 | Addresses scanned: I2C 0x4c |
b04f2f7d | 391 | |
1daaceb2 | 392 | Datasheet: Publicly available at TI website |
1daaceb2 | 393 | |
6c7b66be | 394 | https://www.ti.com/litv/pdf/sbos686 |
7f15b664 | 395 | |
f8344f76 GR |
396 | * Texas Instruments TMP461 |
397 | ||
398 | Prefix: 'tmp461' | |
399 | ||
400 | Addresses scanned: I2C 0x48 through 0x4F | |
401 | ||
402 | Datasheet: Publicly available at TI website | |
403 | ||
404 | https://www.ti.com/lit/gpn/tmp461 | |
405 | ||
37d1dc8d GR |
406 | * Philips NE1617, NE1617A |
407 | ||
408 | Prefix: 'max1617' (probably detected as a max1617) | |
409 | ||
410 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
411 | ||
412 | Datasheets: Publicly available at the Philips website | |
413 | ||
9a198663 GR |
414 | * Philips NE1618 |
415 | ||
416 | Prefix: 'ne1618' | |
417 | ||
418 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
419 | ||
420 | Datasheets: Publicly available at the Philips website | |
421 | ||
37d1dc8d GR |
422 | * Genesys Logic GL523SM |
423 | ||
424 | Prefix: 'gl523sm' | |
425 | ||
426 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
427 | ||
428 | Datasheet: | |
429 | ||
430 | * TI THMC10 | |
431 | ||
432 | Prefix: 'thmc10' | |
433 | ||
434 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
435 | ||
436 | Datasheet: Publicly available at the TI website | |
437 | ||
438 | * Onsemi MC1066 | |
439 | ||
440 | Prefix: 'mc1066' | |
441 | ||
442 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e | |
443 | ||
444 | Datasheet: Publicly available at the Onsemi website | |
445 | ||
7c81c60f | 446 | Author: Jean Delvare <jdelvare@suse.de> |
7f15b664 M |
447 | |
448 | ||
449 | Description | |
450 | ----------- | |
451 | ||
452 | The LM90 is a digital temperature sensor. It senses its own temperature as | |
453 | well as the temperature of up to one external diode. It is compatible | |
23b2d477 | 454 | with many other devices, many of which are supported by this driver. |
32c82a93 | 455 | |
c09472fc GR |
456 | The family of chips supported by this driver is derived from MAX1617. |
457 | This chip as well as various compatible chips support a local and a remote | |
458 | temperature sensor with 8 bit accuracy. Later chips provide improved accuracy | |
459 | and other additional features such as hysteresis and temperature offset | |
460 | registers. | |
461 | ||
32c82a93 | 462 | Note that there is no easy way to differentiate between the MAX6657, |
6948708d GR |
463 | MAX6658 and MAX6659 variants. The extra features of the MAX6659 are only |
464 | supported by this driver if the chip is located at address 0x4d or 0x4e, | |
465 | or if the chip type is explicitly selected as max6659. | |
466 | The MAX6680 and MAX6681 only differ in their pinout, therefore they obviously | |
467 | can't (and don't need to) be distinguished. | |
7f15b664 | 468 | |
7f15b664 | 469 | The different chipsets of the family are not strictly identical, although |
f65e1708 JD |
470 | very similar. For reference, here comes a non-exhaustive list of specific |
471 | features: | |
7f15b664 | 472 | |
c09472fc GR |
473 | LM84: |
474 | * 8 bit sensor resolution | |
475 | ||
f63f6cce | 476 | ADM1020, ADM1021, GL523SM, MAX1617, NE1617, NE1617A, THMC10: |
c09472fc GR |
477 | * 8 bit sensor resolution |
478 | * Low temperature limits | |
479 | ||
9a198663 | 480 | NCT210, NE1618: |
af4540b1 GR |
481 | * 11 bit sensor resolution for remote temperature sensor |
482 | * Low temperature limits | |
483 | ||
0c6bffd4 GR |
484 | ADM1021A, ADM1023: |
485 | * Temperature offset register for remote temperature sensor | |
486 | * 11 bit resolution for remote temperature sensor | |
487 | * Low temperature limits | |
488 | ||
7f15b664 | 489 | LM90: |
c09472fc GR |
490 | * 11 bit resolution for remote temperature sensor |
491 | * Temperature offset register for remote temperature sensor | |
492 | * Low and critical temperature limits | |
493 | * Configurable conversion rate | |
7f15b664 M |
494 | * Filter and alert configuration register at 0xBF. |
495 | * ALERT is triggered by temperatures over critical limits. | |
496 | ||
497 | LM86 and LM89: | |
498 | * Same as LM90 | |
499 | * Better external channel accuracy | |
500 | ||
501 | LM99: | |
502 | * Same as LM89 | |
503 | * External temperature shifted by 16 degrees down | |
504 | ||
505 | ADM1032: | |
506 | * Consecutive alert register at 0x22. | |
507 | * Conversion averaging. | |
508 | * Up to 64 conversions/s. | |
509 | * ALERT is triggered by open remote sensor. | |
c3df5806 | 510 | * SMBus PEC support for Write Byte and Receive Byte transactions. |
7f15b664 | 511 | |
5a4e5e6a | 512 | ADT7461, ADT7461A, NCT1008: |
7f15b664 M |
513 | * Extended temperature range (breaks compatibility) |
514 | * Lower resolution for remote temperature | |
425f5b5d | 515 | * SMBus PEC support for Write Byte and Receive Byte transactions. |
a9f3d3a8 GR |
516 | * 10 bit temperature resolution |
517 | ||
518 | ADT7481, ADT7482, ADT7483: | |
519 | * Temperature offset register | |
520 | * SMBus PEC support | |
521 | * 10 bit temperature resolution for external sensors | |
522 | * Two remote sensors | |
523 | * Selectable address (ADT7483) | |
7f15b664 | 524 | |
3c1ecccb GR |
525 | MAX6642: |
526 | * No critical limit register | |
527 | * Conversion rate not configurable | |
528 | * Better local resolution (10 bit) | |
529 | * 10 bit external sensor resolution | |
530 | ||
904a6fe6 GR |
531 | MAX6646, MAX6647, MAX6649: |
532 | * Better local resolution | |
533 | * Extended range unsigned external temperature | |
534 | ||
535 | MAX6648, MAX6692: | |
536 | * Better local resolution | |
537 | * Unsigned temperature | |
538 | ||
399a8a00 | 539 | MAX6654, MAX6690: |
229d495d JL |
540 | * Better local resolution |
541 | * Selectable address | |
542 | * Remote sensor type selection | |
543 | * Extended temperature range | |
544 | * Extended resolution only available when conversion rate <= 1 Hz | |
545 | ||
7f15b664 | 546 | MAX6657 and MAX6658: |
f65e1708 | 547 | * Better local resolution |
7f15b664 M |
548 | * Remote sensor type selection |
549 | ||
32c82a93 | 550 | MAX6659: |
f65e1708 | 551 | * Better local resolution |
7f15b664 M |
552 | * Selectable address |
553 | * Second critical temperature limit | |
554 | * Remote sensor type selection | |
555 | ||
32c82a93 RB |
556 | MAX6680 and MAX6681: |
557 | * Selectable address | |
558 | * Remote sensor type selection | |
559 | ||
06e1c0a2 GR |
560 | MAX6695 and MAX6696: |
561 | * Better local resolution | |
562 | * Selectable address (max6696) | |
563 | * Second critical temperature limit | |
564 | * Two remote sensors | |
565 | ||
c4f99a2b JD |
566 | W83L771W/G |
567 | * The G variant is lead-free, otherwise similar to the W. | |
568 | * Filter and alert configuration register at 0xBF | |
569 | * Moving average (depending on conversion rate) | |
570 | ||
6771ea1f | 571 | W83L771AWG/ASG |
c4f99a2b | 572 | * Successor of the W83L771W/G, same features. |
6771ea1f | 573 | * The AWG and ASG variants only differ in package format. |
6771ea1f | 574 | * Diode ideality factor configuration (remote sensor) at 0xE3 |
6771ea1f | 575 | |
2ef01793 SD |
576 | SA56004X: |
577 | * Better local resolution | |
578 | ||
7f15b664 M |
579 | All temperature values are given in degrees Celsius. Resolution |
580 | is 1.0 degree for the local temperature, 0.125 degree for the remote | |
229d495d JL |
581 | temperature, except for the MAX6654, MAX6657, MAX6658 and MAX6659 which have |
582 | a resolution of 0.125 degree for both temperatures. | |
7f15b664 M |
583 | |
584 | Each sensor has its own high and low limits, plus a critical limit. | |
585 | Additionally, there is a relative hysteresis value common to both critical | |
586 | values. To make life easier to user-space applications, two absolute values | |
587 | are exported, one for each channel, but these values are of course linked. | |
588 | Only the local hysteresis can be set from user-space, and the same delta | |
589 | applies to the remote hysteresis. | |
590 | ||
177e7592 GR |
591 | The lm90 driver will not update its values more frequently than configured with |
592 | the update_interval attribute; reading them more often will do no harm, but will | |
593 | return 'old' values. | |
7f15b664 | 594 | |
53de3342 JD |
595 | SMBus Alert Support |
596 | ------------------- | |
597 | ||
598 | This driver has basic support for SMBus alert. When an alert is received, | |
599 | the status register is read and the faulty temperature channel is logged. | |
600 | ||
5a4e5e6a GR |
601 | The Analog Devices chips (ADM1032, ADT7461 and ADT7461A) and ON |
602 | Semiconductor chips (NCT1008) do not implement the SMBus alert protocol | |
603 | properly so additional care is needed: the ALERT output is disabled when | |
604 | an alert is received, and is re-enabled only when the alarm is gone. | |
605 | Otherwise the chip would block alerts from other chips in the bus as long | |
606 | as the alarm is active. | |
53de3342 | 607 | |
c3df5806 JD |
608 | PEC Support |
609 | ----------- | |
610 | ||
611 | The ADM1032 is the only chip of the family which supports PEC. It does | |
612 | not support PEC on all transactions though, so some care must be taken. | |
613 | ||
614 | When reading a register value, the PEC byte is computed and sent by the | |
615 | ADM1032 chip. However, in the case of a combined transaction (SMBus Read | |
616 | Byte), the ADM1032 computes the CRC value over only the second half of | |
617 | the message rather than its entirety, because it thinks the first half | |
618 | of the message belongs to a different transaction. As a result, the CRC | |
619 | value differs from what the SMBus master expects, and all reads fail. | |
620 | ||
621 | For this reason, the lm90 driver will enable PEC for the ADM1032 only if | |
622 | the bus supports the SMBus Send Byte and Receive Byte transaction types. | |
623 | These transactions will be used to read register values, instead of | |
624 | SMBus Read Byte, and PEC will work properly. | |
625 | ||
626 | Additionally, the ADM1032 doesn't support SMBus Send Byte with PEC. | |
627 | Instead, it will try to write the PEC value to the register (because the | |
628 | SMBus Send Byte transaction with PEC is similar to a Write Byte transaction | |
0966415d | 629 | without PEC), which is not what we want. Thus, PEC is explicitly disabled |
c3df5806 JD |
630 | on SMBus Send Byte transactions in the lm90 driver. |
631 | ||
632 | PEC on byte data transactions represents a significant increase in bandwidth | |
633 | usage (+33% for writes, +25% for reads) in normal conditions. With the need | |
634 | to use two SMBus transaction for reads, this overhead jumps to +50%. Worse, | |
635 | two transactions will typically mean twice as much delay waiting for | |
636 | transaction completion, effectively doubling the register cache refresh time. | |
637 | I guess reliability comes at a price, but it's quite expensive this time. | |
638 | ||
3b0982ff GR |
639 | So, as not everyone might enjoy the slowdown, PEC is disabled by default and |
640 | can be enabled through sysfs. Just write 1 to the "pec" file and PEC will be | |
641 | enabled. Write 0 to that file to disable PEC again. |