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Commit | Line | Data |
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3b02d332 HG |
1 | Kernel driver f71882fg |
2 | ====================== | |
3 | ||
4 | Supported chips: | |
09475d32 HG |
5 | * Fintek F71858FG |
6 | Prefix: 'f71858fg' | |
3b02d332 HG |
7 | Addresses scanned: none, address read from Super I/O config space |
8 | Datasheet: Available from the Fintek website | |
9 | * Fintek F71862FG and F71863FG | |
10 | Prefix: 'f71862fg' | |
11 | Addresses scanned: none, address read from Super I/O config space | |
12 | Datasheet: Available from the Fintek website | |
09475d32 HG |
13 | * Fintek F71882FG and F71883FG |
14 | Prefix: 'f71882fg' | |
15 | Addresses scanned: none, address read from Super I/O config space | |
16 | Datasheet: Available from the Fintek website | |
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17 | * Fintek F8000 |
18 | Prefix: 'f8000' | |
19 | Addresses scanned: none, address read from Super I/O config space | |
20 | Datasheet: Not public | |
21 | ||
22 | Author: Hans de Goede <hdegoede@redhat.com> | |
23 | ||
24 | ||
25 | Description | |
26 | ----------- | |
27 | ||
28 | Fintek F718xxFG/F8000 Super I/O chips include complete hardware monitoring | |
29 | capabilities. They can monitor up to 9 voltages (3 for the F8000), 4 fans and | |
30 | 3 temperature sensors. | |
31 | ||
32 | These chips also have fan controlling features, using either DC or PWM, in | |
33 | three different modes (one manual, two automatic). | |
34 | ||
35 | The driver assumes that no more than one chip is present, which seems | |
36 | reasonable. | |
37 | ||
38 | ||
39 | Monitoring | |
40 | ---------- | |
41 | ||
42 | The Voltage, Fan and Temperature Monitoring uses the standard sysfs | |
43 | interface as documented in sysfs-interface, without any exceptions. | |
44 | ||
45 | ||
46 | Fan Control | |
47 | ----------- | |
48 | ||
49 | Both PWM (pulse-width modulation) and DC fan speed control methods are | |
50 | supported. The right one to use depends on external circuitry on the | |
51 | motherboard, so the driver assumes that the BIOS set the method | |
52 | properly. | |
53 | ||
54 | There are 2 modes to specify the speed of the fan, PWM duty cycle (or DC | |
55 | voltage) mode, where 0-100% duty cycle (0-100% of 12V) is specified. And RPM | |
56 | mode where the actual RPM of the fan (as measured) is controlled and the speed | |
57 | gets specified as 0-100% of the fan#_full_speed file. | |
58 | ||
59 | Since both modes work in a 0-100% (mapped to 0-255) scale, there isn't a | |
60 | whole lot of a difference when modifying fan control settings. The only | |
61 | important difference is that in RPM mode the 0-100% controls the fan speed | |
62 | between 0-100% of fan#_full_speed. It is assumed that if the BIOS programs | |
63 | RPM mode, it will also set fan#_full_speed properly, if it does not then | |
64 | fan control will not work properly, unless you set a sane fan#_full_speed | |
65 | value yourself. | |
66 | ||
67 | Switching between these modes requires re-initializing a whole bunch of | |
68 | registers, so the mode which the BIOS has set is kept. The mode is | |
69 | printed when loading the driver. | |
70 | ||
71 | Three different fan control modes are supported; the mode number is written | |
72 | to the pwm#_enable file. Note that not all modes are supported on all | |
09475d32 | 73 | chips, and some modes may only be available in RPM / PWM mode. |
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74 | Writing an unsupported mode will result in an invalid parameter error. |
75 | ||
76 | * 1: Manual mode | |
77 | You ask for a specific PWM duty cycle / DC voltage or a specific % of | |
78 | fan#_full_speed by writing to the pwm# file. This mode is only | |
09475d32 | 79 | available on the F71858FG / F8000 if the fan channel is in RPM mode. |
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80 | |
81 | * 2: Normal auto mode | |
82 | You can define a number of temperature/fan speed trip points, which % the | |
83 | fan should run at at this temp and which temp a fan should follow using the | |
84 | standard sysfs interface. The number and type of trip points is chip | |
85 | depended, see which files are available in sysfs. | |
86 | Fan/PWM channel 3 of the F8000 is always in this mode! | |
87 | ||
88 | * 3: Thermostat mode (Only available on the F8000 when in duty cycle mode) | |
89 | The fan speed is regulated to keep the temp the fan is mapped to between | |
90 | temp#_auto_point2_temp and temp#_auto_point3_temp. | |
91 | ||
92 | Both of the automatic modes require that pwm1 corresponds to fan1, pwm2 to | |
93 | fan2 and pwm3 to fan3. |