tjh.dev
Linux kernel mirror (for testing)
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kernel
os
linux
1Kernel driver w83791d
2=====================
3
4Supported chips:
5 * Winbond W83791D
6 Prefix: 'w83791d'
7 Addresses scanned: I2C 0x2c - 0x2f
8 Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83791Da.pdf
9
10Author: Charles Spirakis <bezaur@gmail.com>
11
12This driver was derived from the w83781d.c and w83792d.c source files.
13
14Credits:
15 w83781d.c:
16 Frodo Looijaard <frodol@dds.nl>,
17 Philip Edelbrock <phil@netroedge.com>,
18 and Mark Studebaker <mdsxyz123@yahoo.com>
19 w83792d.c:
20 Chunhao Huang <DZShen@Winbond.com.tw>,
21 Rudolf Marek <r.marek@sh.cvut.cz>
22
23Module Parameters
24-----------------
25
26* init boolean
27 (default 0)
28 Use 'init=1' to have the driver do extra software initializations.
29 The default behavior is to do the minimum initialization possible
30 and depend on the BIOS to properly setup the chip. If you know you
31 have a w83791d and you're having problems, try init=1 before trying
32 reset=1.
33
34* reset boolean
35 (default 0)
36 Use 'reset=1' to reset the chip (via index 0x40, bit 7). The default
37 behavior is no chip reset to preserve BIOS settings.
38
39* force_subclients=bus,caddr,saddr,saddr
40 This is used to force the i2c addresses for subclients of
41 a certain chip. Example usage is `force_subclients=0,0x2f,0x4a,0x4b'
42 to force the subclients of chip 0x2f on bus 0 to i2c addresses
43 0x4a and 0x4b.
44
45
46Description
47-----------
48
49This driver implements support for the Winbond W83791D chip.
50
51Detection of the chip can sometimes be foiled because it can be in an
52internal state that allows no clean access (Bank with ID register is not
53currently selected). If you know the address of the chip, use a 'force'
54parameter; this will put it into a more well-behaved state first.
55
56The driver implements three temperature sensors, five fan rotation speed
57sensors, and ten voltage sensors.
58
59Temperatures are measured in degrees Celsius and measurement resolution is 1
60degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when
61the temperature gets higher than the Overtemperature Shutdown value; it stays
62on until the temperature falls below the Hysteresis value.
63
64Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
65triggered if the rotation speed has dropped below a programmable limit. Fan
66readings can be divided by a programmable divider (1, 2, 4, 8 for fan 1/2/3
67and 1, 2, 4, 8, 16, 32, 64 or 128 for fan 4/5) to give the readings more
68range or accuracy.
69
70Voltage sensors (also known as IN sensors) report their values in millivolts.
71An alarm is triggered if the voltage has crossed a programmable minimum
72or maximum limit.
73
74Alarms are provided as output from a "realtime status register". The
75following bits are defined:
76
77bit - alarm on:
780 - Vcore
791 - VINR0
802 - +3.3VIN
813 - 5VDD
824 - temp1
835 - temp2
846 - fan1
857 - fan2
868 - +12VIN
879 - -12VIN
8810 - -5VIN
8911 - fan3
9012 - chassis
9113 - temp3
9214 - VINR1
9315 - reserved
9416 - tart1
9517 - tart2
9618 - tart3
9719 - VSB
9820 - VBAT
9921 - fan4
10022 - fan5
10123 - reserved
102
103When an alarm goes off, you can be warned by a beeping signal through your
104computer speaker. It is possible to enable all beeping globally, or only
105the beeping for some alarms.
106
107The driver only reads the chip values each 3 seconds; reading them more
108often will do no harm, but will return 'old' values.
109
110W83791D TODO:
111---------------
112Provide a patch for per-file alarms as discussed on the mailing list
113Provide a patch for smart-fan control (still need appropriate motherboard/fans)