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Based on kernel version 3.15.4. Page generated on 2014-07-07 09:03 EST.

1	Kernel driver sis5595
2	=====================
3	
4	Supported chips:
5	  * Silicon Integrated Systems Corp. SiS5595 Southbridge Hardware Monitor
6	    Prefix: 'sis5595'
7	    Addresses scanned: ISA in PCI-space encoded address
8	    Datasheet: Publicly available at the Silicon Integrated Systems Corp. site.
9	
10	Authors:
11	        Kyösti Mälkki <kmalkki@cc.hut.fi>,
12	        Mark D. Studebaker <mdsxyz123@yahoo.com>,
13	        Aurelien Jarno <aurelien@aurel32.net> 2.6 port
14	
15	   SiS southbridge has a LM78-like chip integrated on the same IC.
16	   This driver is a customized copy of lm78.c
17	
18	   Supports following revisions:
19	       Version         PCI ID          PCI Revision
20	       1               1039/0008       AF or less
21	       2               1039/0008       B0 or greater
22	
23	   Note: these chips contain a 0008 device which is incompatible with the
24	        5595. We recognize these by the presence of the listed
25	        "blacklist" PCI ID and refuse to load.
26	
27	   NOT SUPPORTED       PCI ID          BLACKLIST PCI ID
28	        540            0008            0540
29	        550            0008            0550
30	       5513            0008            5511
31	       5581            0008            5597
32	       5582            0008            5597
33	       5597            0008            5597
34	        630            0008            0630
35	        645            0008            0645
36	        730            0008            0730
37	        735            0008            0735
38	
39	
40	Module Parameters
41	-----------------
42	force_addr=0xaddr	Set the I/O base address. Useful for boards
43				that don't set the address in the BIOS. Does not do a
44				PCI force; the device must still be present in lspci.
45				Don't use this unless the driver complains that the
46				base address is not set.
47				Example: 'modprobe sis5595 force_addr=0x290'
48	
49	
50	Description
51	-----------
52	
53	The SiS5595 southbridge has integrated hardware monitor functions. It also
54	has an I2C bus, but this driver only supports the hardware monitor. For the
55	I2C bus driver see i2c-sis5595.
56	
57	The SiS5595 implements zero or one temperature sensor, two fan speed
58	sensors, four or five voltage sensors, and alarms.
59	
60	On the first version of the chip, there are four voltage sensors and one
61	temperature sensor.
62	
63	On the second version of the chip, the temperature sensor (temp) and the
64	fifth voltage sensor (in4) share a pin which is configurable, but not
65	through the driver. Sorry. The driver senses the configuration of the pin,
66	which was hopefully set by the BIOS.
67	
68	Temperatures are measured in degrees Celsius. An alarm is triggered once
69	when the max is crossed; it is also triggered when it drops below the min
70	value. Measurements are guaranteed between -55 and +125 degrees, with a
71	resolution of 1 degree.
72	
73	Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
74	triggered if the rotation speed has dropped below a programmable limit. Fan
75	readings can be divided by a programmable divider (1, 2, 4 or 8) to give
76	the readings more range or accuracy. Not all RPM values can accurately be
77	represented, so some rounding is done. With a divider of 2, the lowest
78	representable value is around 2600 RPM.
79	
80	Voltage sensors (also known as IN sensors) report their values in volts. An
81	alarm is triggered if the voltage has crossed a programmable minimum or
82	maximum limit. Note that minimum in this case always means 'closest to
83	zero'; this is important for negative voltage measurements. All voltage
84	inputs can measure voltages between 0 and 4.08 volts, with a resolution of
85	0.016 volt.
86	
87	In addition to the alarms described above, there is a BTI alarm, which gets
88	triggered when an external chip has crossed its limits. Usually, this is
89	connected to some LM75-like chip; if at least one crosses its limits, this
90	bit gets set.
91	
92	If an alarm triggers, it will remain triggered until the hardware register
93	is read at least once. This means that the cause for the alarm may already
94	have disappeared! Note that in the current implementation, all hardware
95	registers are read whenever any data is read (unless it is less than 1.5
96	seconds since the last update). This means that you can easily miss
97	once-only alarms.
98	
99	The SiS5595 only updates its values each 1.5 seconds; reading it more often
100	will do no harm, but will return 'old' values.
101	
102	Problems
103	--------
104	Some chips refuse to be enabled. We don't know why.
105	The driver will recognize this and print a message in dmesg.
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