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via686a

Revision 3146, 8.0 KB (checked in by khali, 6 years ago)
Backport updates from Linux 2.6.
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1	Kernel driver `via686a.o'
2	=========================
3
4	Status: Stable.
5
6	Supported chips:
7	* Via VT82C686A, VT82C686B Southbridge Integrated Hardware Monitor
8	Prefix: 'via686a'
9	Addresses scanned: ISA in PCI-space encoded address
10	Datasheet: On request through web form
11	(http://www.via.com.tw/en/support/datasheets/)
12
13	Authors: Kyösti Mälkki <kmalkki@cc.hut.fi>,
14	Mark D. Studebaker <mdsxyz123@yahoo.com>
15	Bob Dougherty <bobd@stanford.edu>
16	(Some conversion-factor data were contributed by
17	Jonathan Teh Soon Yew <j.teh@iname.com>
18	and Alex van Kaam <darkside@chello.nl>.)
19
20	Module Parameters
21	-----------------
22
23	force_addr=0xaddr Set the I/O base address. Useful for boards that
24	don't set the address in the BIOS. Look for a BIOS
25	upgrade before resorting to this. Does not do a
26	PCI force; the via686a must still be present in lspci.
27	Don't use this unless the driver complains that the
28	base address is not set.
29	Example: 'modprobe via686a force_addr=0x6000'
30
31
32	Description
33	-----------
34
35	The driver does not distinguish between the chips and reports
36	all as a 686A.
37
38	The Via 686a southbridge has integrated hardware monitor functionality.
39	It also has an I2C bus, but this driver only supports the hardware monitor.
40	For the I2C bus driver, see ../busses/i2c-viapro.
41
42	The Via 686a implements three temperature sensors, two fan rotation speed
43	sensors, five voltage sensors and alarms.
44
45	Temperatures are measured in degrees Celsius. An alarm is triggered once
46	when the Overtemperature Shutdown limit is crossed; it is triggered again
47	as soon as it drops below the hysteresis value.
48
49	Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
50	triggered if the rotation speed has dropped below a programmable limit. Fan
51	readings can be divided by a programmable divider (1, 2, 4 or 8) to give
52	the readings more range or accuracy. Not all RPM values can accurately be
53	represented, so some rounding is done. With a divider of 2, the lowest
54	representable value is around 2600 RPM.
55
56	Voltage sensors (also known as IN sensors) report their values in volts.
57	An alarm is triggered if the voltage has crossed a programmable minimum
58	or maximum limit. Voltages are internally scalled, so each voltage channel
59	has a different resolution and range.
60
61	If an alarm triggers, it will remain triggered until the hardware register
62	is read at least once. This means that the cause for the alarm may
63	already have disappeared! Note that in the current implementation, all
64	hardware registers are read whenever any data is read (unless it is less
65	than 1.5 seconds since the last update). This means that you can easily
66	miss once-only alarms.
67
68	The driver only updates its values each 1.5 seconds; reading it more often
69	will do no harm, but will return 'old' values.
70
71
72	Known Issues
73	------------
74
75	This driver handles sensors integrated in some VIA south bridges. It is
76	possible that a motherboard maker used a VT82C686A/B chip as part of a
77	product design but was not interested in its hardware monitoring features,
78	in which case the sensor inputs will not be wired. This is the case of
79	the Asus K7V, A7V and A7V133 motherboards, to name only a few of them.
80	So, if you need the force_addr parameter, and end up with values which
81	don't seem to make any sense, don't look any further: your chip is simply
82	not wired for hardware monitoring.
83
84
85	Chip Features
86	-------------
87
88	Chip `via686a'
89	LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
90	in0 NONE NONE R 2
91	in1 NONE NONE R 2
92	in2 NONE NONE R 2
93	in3 NONE NONE R 2
94	in4 NONE NONE R 2
95	in0_min in0 in0 RW 2
96	in1_min in1 in1 RW 2
97	in2_min in2 in2 RW 2
98	in3_min in3 in3 RW 2
99	in4_min in3 in3 RW 2
100	in0_max in0 in0 RW 2
101	in1_max in1 in1 RW 2
102	in2_max in2 in2 RW 2
103	in3_max in3 in3 RW 2
104	in4_max in3 in3 RW 2
105	fan1 NONE NONE R 0
106	fan2 NONE NONE R 0
107	fan1_min fan1 fan1 RW 0
108	fan2_min fan2 fan2 RW 0
109	temp NONE NONE R 1
110	temp_hyst temp temp RW 1
111	temp_over temp temp RW 1
112	temp2 NONE NONE R 1
113	temp2_hyst temp temp RW 1
114	temp2_over temp temp RW 1
115	temp3 NONE NONE R 1
116	temp3_hyst temp temp RW 1
117	temp3_over temp temp RW 1
118	fan1_div fan1 NONE RW 0
119	fan2_div fan2 NONE RW 0
120	alarms NONE NONE R 0
121
122	LABEL FEATURE SYMBOL SYSCTL FILE:NR
123	in0 SENSORS_VIA686A_IN0 in0:3
124	in1 SENSORS_VIA686A_IN1 in1:3
125	in2 SENSORS_VIA686A_IN2 in2:3
126	in3 SENSORS_VIA686A_IN3 in3:3
127	in4 SENSORS_VIA686A_IN4 in4:3
128	in0_min SENSORS_VIA686A_IN0_MIN in0:1
129	in1_min SENSORS_VIA686A_IN1_MIN in1:1
130	in2_min SENSORS_VIA686A_IN2_MIN in2:1
131	in3_min SENSORS_VIA686A_IN3_MIN in3:1
132	in4_min SENSORS_VIA686A_IN4_MIN in4:1
133	in0_max SENSORS_VIA686A_IN0_MAX in0:2
134	in1_max SENSORS_VIA686A_IN1_MAX in1:2
135	in2_max SENSORS_VIA686A_IN2_MAX in2:2
136	in3_max SENSORS_VIA686A_IN3_MAX in3:2
137	in4_max SENSORS_VIA686A_IN4_MAX in4:2
138	fan1 SENSORS_VIA686A_FAN1 fan1:2
139	fan2 SENSORS_VIA686A_FAN2 fan2:2
140	fan1_min SENSORS_VIA686A_FAN1_MIN fan1:1
141	fan2_min SENSORS_VIA686A_FAN2_MIN fan2:1
142	temp SENSORS_VIA686A_TEMP temp:3
143	temp_hyst SENSORS_VIA686A_TEMP_HYST temp:2
144	temp_over SENSORS_VIA686A_TEMP_OVER temp:1
145	temp2 SENSORS_VIA686A_TEMP2 temp2:3
146	temp2_hyst SENSORS_VIA686A_TEMP2_HYST temp2:2
147	temp2_over SENSORS_VIA686A_TEMP2_OVER temp2:1
148	temp3 SENSORS_VIA686A_TEMP3 temp3:3
149	temp3_hyst SENSORS_VIA686A_TEMP3_HYST temp3:2
150	temp3_over SENSORS_VIA686A_TEMP3_OVER temp3:1
151	fan1_div SENSORS_VIA686A_FAN1_DIV fan_div:1
152	fan2_div SENSORS_VIA686A_FAN2_DIV fan_div:2
153	alarms SENSORS_VIA686A_ALARMS alarms:1
154
155

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