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w83781d @ 601

Revision 601, 30.8 KB (checked in by mds, 14 years ago)
(mds) add support for beep3 register in 782d/783s/627hf.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`

Line
1	Kernel driver `w83781d.o'
2	=========================
3
4	Status: W83781D support is complete and well-tested, others are mostly complete
5	and somewhat tested.
6
7	Supported chips:
8	* Winbond W83781D
9	Prefix 'w83781d'
10	Addresses scanned: I2C 0x20 - 0x2f (inclusive), ISA 0x290 (8 I/O ports)
11	Datasheet: Publicly available at the Winbond website
12	* Winbond W83782D
13	Prefix 'w83782d'
14	Addresses scanned: I2C 0x20 - 0x2f (inclusive), ISA 0x290 (8 I/O ports)
15	Datasheet: Publicly available at the Winbond website
16	* Winbond W83783S
17	Prefix 'w83783s'
18	Addresses scanned: I2C 0x20 - 0x2f (inclusive)
19	Datasheet: Publicly available at the Winbond website
20	* Winbond W83627HF
21	Prefix 'w83627hf'
22	Addresses scanned: I2C 0x20 - 0x2f (inclusive), ISA 0x290 (8 I/O ports)
23	Datasheet: Available on request from Winbond
24
25
26	Author: Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock <phil@netroedge.com>,
27	and Mark Studebaker <mds@eng.paradyne.com>
28
29
30	Module Parameters
31	-----------------
32
33	* force: short array (min = 1, max = 48)
34	List of adapter,address pairs to boldly assume to be present
35	* force_w83781d: short array (min = 1, max = 48)
36	List of adapter,address pairs which are unquestionably assumed to contain
37	a `w83781d' chip
38	* force_w83782d: short array (min = 1, max = 48)
39	List of adapter,address pairs which are unquestionably assumed to contain
40	a `w83782d' chip
41	* force_w83783s: short array (min = 1, max = 48)
42	List of adapter,address pairs which are unquestionably assumed to contain
43	a `w83783s' chip
44	* ignore: short array (min = 1, max = 48)
45	List of adapter,address pairs not to scan
46	* ignore_range: short array (min = 1, max = 48)
47	List of adapter,start-addr,end-addr triples not to scan
48	* probe: short array (min = 1, max = 48)
49	List of adapter,address pairs to scan additionally
50	* probe_range: short array (min = 1, max = 48)
51	List of adapter,start-addr,end-addr triples to scan additionally
52
53
54	Description
55	-----------
56
57	This driver implements support for the Winbond W83781D, W83782D,
58	W8783S, and W83627HF chips.
59	We will refer to them collectively as W8378* chips.
60
61	There is quite some difference between these chips, but they are similar
62	enough that it was sensible to put them together in one driver.
63	The W83627HF chip is assumed to be identical to the W83782D.
64
65	Detection of these chips can sometimes be foiled because they can be in
66	an internal state that allows no clean access. If you know the address
67	of the chip, use a 'force' parameter; this will put them into a more
68	well-behaved state first.
69
70	The W8378* implements temperature sensors (three on the W83781D and W83782D,
71	two on the W83783S), three FAN rotation speed sensors, voltage sensors
72	(seven on the W83781D, nine on the W83782D and six on the W83783S), VID
73	lines, alarms with beep warnings, and some miscellaneous stuff.
74
75	Temperatures are measured in degrees Celcius. There is always one main
76	temperature sensor, and one (W83783S) or two (W83781D and W83782D) other
77	sensors. An alarm is triggered for the main sensor once when the
78	Overtemperature Shutdown limit is crossed; it is triggered again as soon as
79	it drops below the Hysteresis value. A more useful behaviour
80	can be found by setting the Hysteresis value to +127 degrees Celcius; in
81	this case, alarms are issued during all the time when the actual temperature
82	is above the Overtemperature Shutdown value. For the other sensor(s), an
83	alarm is triggered when the temperature gets higher then the Overtemperature
84	Shutdown value; it stays on until the temperature falls below the Hysteresis
85	value. But on the W83781D, there is only one alarm that functions for both
86	other sensors! Temperatures are guaranteed within a range of -55 to +125
87	degrees. The main temperature sensors has a resolution of 1 degree; the other
88	sensor(s) of 0.5 degree.
89
90	FAN rotation speeds are reported in RPM (rotations per minute). An alarm is
91	triggered if the rotation speed has dropped below a programmable limit. FAN
92	readings can be divided by a programmable divider (1, 2, 4 or 8 for the
93	W83781D; 1, 2, 4, 8, 16, 32, 64 or 128 for the W83782D and W83783S) to give
94	the readings more range or accuracy. This is important because some FANs
95	report only one 'tick' each rotation, while others report two - making
96	all readings twice as high. Not all RPM values can accurately be represented,
97	so some rounding is done. With a divider of 2, the lowest representable
98	value is around 2600 RPM.
99
100	Voltage sensors (also known as IN sensors) report their values in volts.
101	An alarm is triggered if the voltage has crossed a programmable minimum
102	or maximum limit. Note that minimum in this case always means 'closest to
103	zero'; this is important for negative voltage measurements. All voltage
104	inputs can measure voltages between 0 and 4.08 volts, with a resolution
105	of 0.016 volt.
106
107	The VID lines encode the core voltage value: the voltage level your processor
108	should work with. This is hardcoded by the mainboard and/or processor itself.
109	It is a value in volts. When it is unconnected, you will often find the
110	value 3.50 V here.
111
112	The W83782D and W83783S temperature conversion machine understands about
113	several kinds of temperature probes. You can program the so-called
114	beta value in the sensor files. '1' is the PII/Celeron diode, '2' is the
115	TN3904 transistor, and 3435 the default thermistor value. Other values
116	are (not yet) supported. You can program your own values through the
117	rt interface, but this is not very useful, because these tables are
118	under NDA.
119
120	In addition to the alarms described above, there is a CHAS alarm on the
121	W83781D and W83782D which triggers if your computer case is open.
122
123	When an alarm goes off, you can be warned by a beeping signal through
124	your computer speaker. It is possible to enable all beeping globally,
125	or only the beeping for some alarms.
126
127	If an alarm triggers, it will remain triggered until the hardware register
128	is read at least once. This means that the cause for the alarm may
129	already have disappeared! Note that in the current implementation, all
130	hardware registers are read whenever any data is read (unless it is less
131	than 1.5 seconds since the last update). This means that you can easily
132	miss once-only alarms.
133
134	The W8378* only updates its values each 1.5 seconds; reading it more often
135	will do no harm, but will return 'old' values.
136
137
138	Chip Features
139	-------------
140
141	Chip `w83781d'
142	LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
143	in0 NONE NONE R 2
144	in1 NONE NONE R 2
145	in2 NONE NONE R 2
146	in3 NONE NONE R 2
147	in4 NONE NONE R 2
148	in5 NONE NONE R 2
149	in6 NONE NONE R 2
150	in0_min in0 in0 RW 2
151	in1_min in1 in1 RW 2
152	in2_min in2 in2 RW 2
153	in3_min in3 in3 RW 2
154	in4_min in4 in4 RW 2
155	in5_min in5 in5 RW 2
156	in6_min in6 in6 RW 2
157	in0_max in0 in0 RW 2
158	in1_max in1 in1 RW 2
159	in2_max in2 in2 RW 2
160	in3_max in3 in3 RW 2
161	in4_max in4 in4 RW 2
162	in5_max in5 in5 RW 2
163	in6_max in6 in6 RW 2
164	fan1 NONE NONE R 0
165	fan2 NONE NONE R 0
166	fan3 NONE NONE R 0
167	fan1_min fan1 NONE RW 0
168	fan2_min fan2 NONE RW 0
169	fan3_min fan3 NONE RW 0
170	temp1 NONE NONE R 1
171	temp1_hyst temp1 temp1 RW 1
172	temp1_over temp1 temp1 RW 1
173	temp2 NONE NONE R 1
174	temp2_hyst temp2 temp2 RW 1
175	temp2_over temp2 temp2 RW 1
176	temp3 NONE NONE R 1
177	temp3_hyst temp3 temp3 RW 1
178	temp3_over temp3 temp3 RW 1
179	vid NONE NONE R 2
180	fan1_div fan1 NONE RW 0
181	fan2_div fan2 NONE RW 0
182	fan3_div fan3 NONE R 0
183	alarms NONE NONE R 0
184	beep_enable alarms NONE RW 0
185	beeps alarms alarms RW 0
186
187	LABEL FEATURE SYMBOL SYSCTL FILE:NR
188	in0 SENSORS_W83781D_IN0 in0:3
189	in1 SENSORS_W83781D_IN1 in1:3
190	in2 SENSORS_W83781D_IN2 in2:3
191	in3 SENSORS_W83781D_IN3 in3:3
192	in4 SENSORS_W83781D_IN4 in4:3
193	in5 SENSORS_W83781D_IN5 in5:3
194	in6 SENSORS_W83781D_IN6 in6:3
195	in0_min SENSORS_W83781D_IN0_MIN in0:1
196	in1_min SENSORS_W83781D_IN1_MIN in1:1
197	in2_min SENSORS_W83781D_IN2_MIN in2:1
198	in3_min SENSORS_W83781D_IN3_MIN in3:1
199	in4_min SENSORS_W83781D_IN4_MIN in4:1
200	in5_min SENSORS_W83781D_IN5_MIN in5:1
201	in6_min SENSORS_W83781D_IN6_MIN in6:1
202	in0_max SENSORS_W83781D_IN0_MAX in0:2
203	in1_max SENSORS_W83781D_IN1_MAX in1:2
204	in2_max SENSORS_W83781D_IN2_MAX in2:2
205	in3_max SENSORS_W83781D_IN3_MAX in3:2
206	in4_max SENSORS_W83781D_IN4_MAX in4:2
207	in5_max SENSORS_W83781D_IN5_MAX in5:2
208	in6_max SENSORS_W83781D_IN6_MAX in6:2
209	fan1 SENSORS_W83781D_FAN1 fan1:2
210	fan2 SENSORS_W83781D_FAN2 fan2:2
211	fan3 SENSORS_W83781D_FAN3 fan3:2
212	fan1_min SENSORS_W83781D_FAN1_MIN fan1:1
213	fan2_min SENSORS_W83781D_FAN2_MIN fan2:1
214	fan3_min SENSORS_W83781D_FAN3_MIN fan3:1
215	temp1 SENSORS_W83781D_TEMP1 temp1:3
216	temp1_hyst SENSORS_W83781D_TEMP1_HYST temp1:2
217	temp1_over SENSORS_W83781D_TEMP1_OVER temp1:1
218	temp2 SENSORS_W83781D_TEMP2 temp2:3
219	temp2_hyst SENSORS_W83781D_TEMP2_HYST temp2:2
220	temp2_over SENSORS_W83781D_TEMP2_OVER temp2:1
221	temp3 SENSORS_W83781D_TEMP3 temp3:3
222	temp3_hyst SENSORS_W83781D_TEMP3_HYST temp3:2
223	temp3_over SENSORS_W83781D_TEMP3_OVER temp3:1
224	vid SENSORS_W83781D_VID vid:1
225	fan1_div SENSORS_W83781D_FAN1_DIV fan_div:1
226	fan2_div SENSORS_W83781D_FAN2_DIV fan_div:2
227	fan3_div SENSORS_W83781D_FAN3_DIV fan_div:3
228	alarms SENSORS_W83781D_ALARMS alarms:1
229	beep_enable SENSORS_W83781D_BEEP_ENABLE beep:1
230	beeps SENSORS_W83781D_BEEPS beep:2
231
232
233	Chip `w83782d'
234	LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
235	in0 NONE NONE R 2
236	in1 NONE NONE R 2
237	in2 NONE NONE R 2
238	in3 NONE NONE R 2
239	in4 NONE NONE R 2
240	in5 NONE NONE R 2
241	in6 NONE NONE R 2
242	in7 NONE NONE R 2
243	in8 NONE NONE R 2
244	in0_min in0 in0 RW 2
245	in1_min in1 in1 RW 2
246	in2_min in2 in2 RW 2
247	in3_min in3 in3 RW 2
248	in4_min in4 in4 RW 2
249	in5_min in5 in5 RW 2
250	in6_min in6 in6 RW 2
251	in7_min in7 in7 RW 2
252	in8_min in8 in8 RW 2
253	in0_max in0 in0 RW 2
254	in1_max in1 in1 RW 2
255	in2_max in2 in2 RW 2
256	in3_max in3 in3 RW 2
257	in4_max in4 in4 RW 2
258	in5_max in5 in5 RW 2
259	in6_max in6 in6 RW 2
260	in7_max in7 in7 RW 2
261	in8_max in8 in8 RW 2
262	fan1 NONE NONE R 0
263	fan2 NONE NONE R 0
264	fan3 NONE NONE R 0
265	fan1_min fan1 NONE RW 0
266	fan2_min fan2 NONE RW 0
267	fan3_min fan3 NONE RW 0
268	temp1 NONE NONE R 1
269	temp1_hyst temp1 temp1 RW 1
270	temp1_over temp1 temp1 RW 1
271	temp2 NONE NONE R 1
272	temp2_hyst temp2 temp2 RW 1
273	temp2_over temp2 temp2 RW 1
274	temp3 NONE NONE R 1
275	temp3_hyst temp3 temp3 RW 1
276	temp3_over temp3 temp3 RW 1
277	vid NONE NONE R 2
278	fan1_div fan1 NONE RW 0
279	fan2_div fan2 NONE RW 0
280	fan3_div fan3 NONE R 0
281	alarms NONE NONE R 0
282	beep_enable alarms NONE RW 0
283	beeps alarms alarms RW 0
284	sensor1 NONE NONE RW 0
285	sensor2 NONE NONE RW 0
286	sensor3 NONE NONE RW 0
287
288	LABEL FEATURE SYMBOL SYSCTL FILE:NR
289	in0 SENSORS_W83782D_IN0 in0:3
290	in1 SENSORS_W83782D_IN1 in1:3
291	in2 SENSORS_W83782D_IN2 in2:3
292	in3 SENSORS_W83782D_IN3 in3:3
293	in4 SENSORS_W83782D_IN4 in4:3
294	in5 SENSORS_W83782D_IN5 in5:3
295	in6 SENSORS_W83782D_IN6 in6:3
296	in7 SENSORS_W83782D_IN7 in7:3
297	in8 SENSORS_W83782D_IN8 in8:3
298	in0_min SENSORS_W83782D_IN0_MIN in0:1
299	in1_min SENSORS_W83782D_IN1_MIN in1:1
300	in2_min SENSORS_W83782D_IN2_MIN in2:1
301	in3_min SENSORS_W83782D_IN3_MIN in3:1
302	in4_min SENSORS_W83782D_IN4_MIN in4:1
303	in5_min SENSORS_W83782D_IN5_MIN in5:1
304	in6_min SENSORS_W83782D_IN6_MIN in6:1
305	in7_min SENSORS_W83782D_IN7_MIN in7:1
306	in8_min SENSORS_W83782D_IN8_MIN in8:1
307	in0_max SENSORS_W83782D_IN0_MAX in0:2
308	in1_max SENSORS_W83782D_IN1_MAX in1:2
309	in2_max SENSORS_W83782D_IN2_MAX in2:2
310	in3_max SENSORS_W83782D_IN3_MAX in3:2
311	in4_max SENSORS_W83782D_IN4_MAX in4:2
312	in5_max SENSORS_W83782D_IN5_MAX in5:2
313	in6_max SENSORS_W83782D_IN6_MAX in6:2
314	in7_max SENSORS_W83782D_IN7_MAX in7:2
315	in8_max SENSORS_W83782D_IN8_MAX in8:2
316	fan1 SENSORS_W83782D_FAN1 fan1:2
317	fan2 SENSORS_W83782D_FAN2 fan2:2
318	fan3 SENSORS_W83781D_FAN3 fan3:2
319	fan1_min SENSORS_W83782D_FAN1_MIN fan1:1
320	fan2_min SENSORS_W83782D_FAN2_MIN fan2:1
321	fan3_min SENSORS_W83781D_FAN3_MIN fan3:1
322	temp1 SENSORS_W83782D_TEMP1 temp1:3
323	temp1_hyst SENSORS_W83782D_TEMP1_HYST temp1:2
324	temp1_over SENSORS_W83782D_TEMP1_OVER temp1:1
325	temp2 SENSORS_W83782D_TEMP2 temp2:3
326	temp2_hyst SENSORS_W83782D_TEMP2_HYST temp2:2
327	temp2_over SENSORS_W83782D_TEMP2_OVER temp2:1
328	temp3 SENSORS_W83782D_TEMP3 temp3:3
329	temp3_hyst SENSORS_W83782D_TEMP3_HYST temp3:2
330	temp3_over SENSORS_W83782D_TEMP3_OVER temp3:1
331	vid SENSORS_W83782D_VID vid:1
332	fan1_div SENSORS_W83782D_FAN1_DIV fan_div:1
333	fan2_div SENSORS_W83782D_FAN2_DIV fan_div:2
334	fan3_div SENSORS_W83781D_FAN3_DIV fan_div:3
335	alarms SENSORS_W83782D_ALARMS alarms:1
336	beep_enable SENSORS_W83782D_BEEP_ENABLE beep:1
337	beeps SENSORS_W83782D_BEEPS beep:2
338	sensor1 SENSORS_W83782D_SENS1 sensor1:1
339	sensor2 SENSORS_W83782D_SENS2 sensor2:1
340	sensor3 SENSORS_W83782D_SENS3 sensor3:1
341
342
343	Chip `w83783s'
344	LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
345	in0 NONE NONE R 2
346	in1 NONE NONE R 2
347	in2 NONE NONE R 2
348	in3 NONE NONE R 2
349	in4 NONE NONE R 2
350	in5 NONE NONE R 2
351	in6 NONE NONE R 2
352	in0_min in0 in0 RW 2
353	in1_min in1 in1 RW 2
354	in2_min in2 in2 RW 2
355	in3_min in3 in3 RW 2
356	in4_min in4 in4 RW 2
357	in5_min in5 in5 RW 2
358	in6_min in6 in6 RW 2
359	in0_max in0 in0 RW 2
360	in1_max in1 in1 RW 2
361	in2_max in2 in2 RW 2
362	in3_max in3 in3 RW 2
363	in4_max in4 in4 RW 2
364	in5_max in5 in5 RW 2
365	in6_max in6 in6 RW 2
366	fan1 NONE NONE R 0
367	fan2 NONE NONE R 0
368	fan3 NONE NONE R 0
369	fan1_min fan1 NONE RW 0
370	fan2_min fan2 NONE RW 0
371	fan3_min fan3 NONE RW 0
372	temp1 NONE NONE R 1
373	temp1_hyst temp1 temp1 RW 1
374	temp1_over temp1 temp1 RW 1
375	temp2 NONE NONE R 1
376	temp2_hyst temp2 temp2 RW 1
377	temp2_over temp2 temp2 RW 1
378	vid NONE NONE R 2
379	fan1_div fan1 NONE RW 0
380	fan2_div fan2 NONE RW 0
381	fan3_div fan3 NONE R 0
382	alarms NONE NONE R 0
383	beep_enable alarms NONE RW 0
384	beeps alarms alarms RW 0
385	sensor1 NONE NONE RW 0
386	sensor2 NONE NONE RW 0
387
388	LABEL FEATURE SYMBOL SYSCTL FILE:NR
389	in0 SENSORS_W83783S_IN0 in0:3
390	in1 SENSORS_W83783S_IN1 in1:3
391	in2 SENSORS_W83783S_IN2 in2:3
392	in3 SENSORS_W83783S_IN3 in3:3
393	in4 SENSORS_W83783S_IN4 in4:3
394	in5 SENSORS_W83783S_IN5 in5:3
395	in6 SENSORS_W83783S_IN6 in6:3
396	in0_min SENSORS_W83783S_IN0_MIN in0:1
397	in1_min SENSORS_W83783S_IN1_MIN in1:1
398	in2_min SENSORS_W83783S_IN2_MIN in2:1
399	in3_min SENSORS_W83783S_IN3_MIN in3:1
400	in4_min SENSORS_W83783S_IN4_MIN in4:1
401	in5_min SENSORS_W83783S_IN5_MIN in5:1
402	in6_min SENSORS_W83783S_IN6_MIN in6:1
403	in0_max SENSORS_W83783S_IN0_MAX in0:2
404	in1_max SENSORS_W83783S_IN1_MAX in1:2
405	in2_max SENSORS_W83783S_IN2_MAX in2:2
406	in3_max SENSORS_W83783S_IN3_MAX in3:2
407	in4_max SENSORS_W83783S_IN4_MAX in4:2
408	in5_max SENSORS_W83783S_IN5_MAX in5:2
409	in6_max SENSORS_W83783S_IN6_MAX in6:2
410	fan1 SENSORS_W83783S_FAN1 fan1:2
411	fan2 SENSORS_W83783S_FAN2 fan2:2
412	fan3 SENSORS_W83783S_FAN3 fan3:2
413	fan1_min SENSORS_W83783S_FAN1_MIN fan1:1
414	fan2_min SENSORS_W83783S_FAN2_MIN fan2:1
415	fan3_min SENSORS_W83783S_FAN3_MIN fan3:1
416	temp1 SENSORS_W83783S_TEMP1 temp1:3
417	temp1_hyst SENSORS_W83783S_TEMP1_HYST temp1:2
418	temp1_over SENSORS_W83783S_TEMP1_OVER temp1:1
419	temp2 SENSORS_W83783S_TEMP2 temp2:3
420	temp2_hyst SENSORS_W83783S_TEMP2_HYST temp2:2
421	temp2_over SENSORS_W83783S_TEMP2_OVER temp2:1
422	vid SENSORS_W83783S_VID vid:1
423	fan1_div SENSORS_W83783S_FAN1_DIV fan_div:1
424	fan2_div SENSORS_W83783S_FAN2_DIV fan_div:2
425	fan3_div SENSORS_W83783S_FAN3_DIV fan_div:3
426	alarms SENSORS_W83783S_ALARMS alarms:1
427	beep_enable SENSORS_W83783S_BEEP_ENABLE beep:1
428	beeps SENSORS_W83783S_BEEPS beep:2
429	sensor1 SENSORS_W83783S_SENS1 sensor1:1
430	sensor2 SENSORS_W83783S_SENS2 sensor2:1
431
432
433
434	Old documentation
435	-----------------
436
437
438	Winbond 83781D driver
439	---------------------
440	Supports the following Winbond chips:
441
442	Chip #vin #fanin #pwm #temp wchipid i2c ISA
443	------------------------------------------------------------
444	w83781d 7 3 0 3 0x10 yes yes
445	w83782d 9 3 2-4 3 0x30 yes yes
446	w83783s 5-6 3 2 1-2 0x40 yes no
447
448
449	Stability
450	---------
451	w83781d: tested, stable
452	w83782d: beta tested, some minor bugs and things to do.
453	w83783s: untested
454
455
456	/PROC ENTRIES
457	-------------
458	Varies depending on chip type. Most are identical to the lm78 entries.
459	See the lm78 documentation for details.
460
461	Additional entries not in the lm78:
462
463	pwm[1-4]: (782d/783s only)
464	Controls the speed of the fans with PWM (Pulse Width Modulation)
465	Valid values:
466	0 - 255. 255 = max speed.
467
468	sensor[1-3]: (782d/783s only)
469	Controls the sensor type. To change to a different
470	sensor type, for example, do 'echo 2 > sensor1'.
471	Valid values:
472	1: Pentium II / Celeron diode
473	2: 2N3904 Transistor in a diode configuration
474	3435: Thermistor with Beta = 3435. Beta is a measure
475	of sensitivity to temperature.
476	Thermistors with other Betas could in theory be supported
477	after correspondence with Winbond. See below.
478
479	rt[1-3]: (781d only)
480	32-byte tables controlling the conversion from
481	resistance to temperature for thermistors.
482	For the curious only. Writing to these entries will
483	probably render temperature sensing insane.
484	Only set at initialization; not updated every 1.5 seconds.
485
486
487	The driver only updates its values each 1.5 seconds; reading it more often
488	will do no harm, but will return 'old' values.
489
490
491	TO DO:
492	-----
493	782d programmable pins
494	783s temp2 (labeled as temp1 in data sheet) at different location
495	than 781d/782d, not implemented yet.
496
497
498	NOTES:
499	-----
500	783s has no in1 so that in[2-6] are compatible with the 781d/782d.
501
502	783s pin is programmable for -5V or temp1; defaults to -5V,
503	no control in driver so temp1 doesn't work.
504
505	782d and 783s datasheets differ on which is pwm1 and which is pwm2.
506	We chose to follow 782d.
507
508	782d and 783s pin is programmable for fan3 input or pwm2 output;
509	defaults to fan3 input.
510	no control in driver so pwm2 doesn't work.
511
512	782d has pwm1-2 for isa, pwm1-4 for i2c. (pwm3-4 share pins with
513	the isa pins)
514
515	781d allowable values for fan_div are 1,2,4,8.
516	782d/783s allowable values for fan_div are 1,2,4,8,16,32,64,128.
517
518
519
520	Data sheet updates:
521	------------------
522	- Mask off lower bit of all ID registers.
523
524	- PWM clock registers:
525
526	000: master / 512
527	001: master / 1024
528	010: master / 2048
529	011: master / 4096
530	100: master / 8192
531
532
533	Answers from Winbond tech support
534	---------------------------------
535	>
536	> 1) In the W83781D data sheet section 7.2 last paragraph, it talks about
537	> reprogramming the R-T table if the Beta of the thermistor is not
538	> 3435K. The R-T table is described briefly in section 8.20.
539	> What formulas do I use to program a new R-T table for a given Beta?
540	>
541	We are sorry that the calculation for R-T table value is
542	confidential. If you have another Beta value of thermistor, we can help
543	to calculate the R-T table for you. But you should give us real R-T
544	Table which can be gotten by thermistor vendor. Therefore we will calculate
545	them and obtain 32-byte data, and you can fill the 32-byte data to the
546	register in Bank0.CR51 of W83781D.
547
548
549	> 2) In the W83782D data sheet, it mentions that pins 38, 39, and 40 are
550	> programmable to be either thermistor or Pentium II diode inputs.
551	> How do I program them for diode inputs? I can't find any register
552	> to program these to be diode inputs.
553	--> You may program Bank0 CR[5Dh] and CR[59h] registers.
554
555	CR[5Dh] bit 1(VTIN1) bit 2(VTIN2) bit 3(VTIN3)
556
557	thermistor 0 0 0
558	diode 1 1 1
559
560
561	CR[59h] bit 4(VTIN1) bit 2(VTIN2) bit 3(VTIN3)
562
563	PII thermal diode 1 1 1
564	2N3904 diode 0 0 0
565
566
567	Author/Maintainer
568	-----------------
569	Original 781D support: Frodo and Phil (lm78@stimpy.netroedge.com)
570	782D/783S support added by: Mark D. Studebaker (mds@eng.paradyne.com)
571	Send requests to the lm78@stimpy.netroedge.com mailing list.

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