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Rudolf Marek563daaf2006-07-05 18:15:31 +02001Kernel driver w83627ehf
2=======================
3
4Supported chips:
Gong Jun237c8d2f2009-03-30 21:46:42 +02005 * Winbond W83627EHF/EHG (ISA access ONLY)
Rudolf Marek563daaf2006-07-05 18:15:31 +02006 Prefix: 'w83627ehf'
7 Addresses scanned: ISA address retrieved from Super I/O registers
Guenter Roeck96d1eac2011-02-11 08:10:53 -08008 Datasheet: not available
Gong Jun237c8d2f2009-03-30 21:46:42 +02009 * Winbond W83627DHG
10 Prefix: 'w83627dhg'
11 Addresses scanned: ISA address retrieved from Super I/O registers
Guenter Roeck96d1eac2011-02-11 08:10:53 -080012 Datasheet: not available
Jean Delvarec1e48dc2009-06-15 18:39:50 +020013 * Winbond W83627DHG-P
14 Prefix: 'w83627dhg'
15 Addresses scanned: ISA address retrieved from Super I/O registers
16 Datasheet: not available
Jean Delvareeff76872011-11-04 12:00:48 +010017 * Winbond W83627UHG
18 Prefix: 'w83627uhg'
19 Addresses scanned: ISA address retrieved from Super I/O registers
20 Datasheet: available from www.nuvoton.com
Gong Jun237c8d2f2009-03-30 21:46:42 +020021 * Winbond W83667HG
22 Prefix: 'w83667hg'
23 Addresses scanned: ISA address retrieved from Super I/O registers
24 Datasheet: not available
Guenter Roeckc39aeda2010-08-14 21:08:55 +020025 * Winbond W83667HG-B
26 Prefix: 'w83667hg'
27 Addresses scanned: ISA address retrieved from Super I/O registers
28 Datasheet: Available from Nuvoton upon request
Guenter Roeckec3e5a12011-02-02 08:46:49 -080029 * Nuvoton NCT6775F/W83667HG-I
30 Prefix: 'nct6775'
31 Addresses scanned: ISA address retrieved from Super I/O registers
32 Datasheet: Available from Nuvoton upon request
33 * Nuvoton NCT6776F
34 Prefix: 'nct6776'
35 Addresses scanned: ISA address retrieved from Super I/O registers
36 Datasheet: Available from Nuvoton upon request
Rudolf Marek563daaf2006-07-05 18:15:31 +020037
38Authors:
39 Jean Delvare <khali@linux-fr.org>
Jean Delvare3379cee2006-09-24 21:25:52 +020040 Yuan Mu (Winbond)
Jean Delvare7188cc62006-12-12 18:18:30 +010041 Rudolf Marek <r.marek@assembler.cz>
David Hubbard657c93b2007-02-14 21:15:04 +010042 David Hubbard <david.c.hubbard@gmail.com>
Gong Jun237c8d2f2009-03-30 21:46:42 +020043 Gong Jun <JGong@nuvoton.com>
Rudolf Marek563daaf2006-07-05 18:15:31 +020044
45Description
46-----------
47
Gong Jun237c8d2f2009-03-30 21:46:42 +020048This driver implements support for the Winbond W83627EHF, W83627EHG,
Jean Delvareeff76872011-11-04 12:00:48 +010049W83627DHG, W83627DHG-P, W83627UHG, W83667HG, W83667HG-B, W83667HG-I
50(NCT6775F), and NCT6776F super I/O chips. We will refer to them collectively
51as Winbond chips.
Rudolf Marek563daaf2006-07-05 18:15:31 +020052
Jean Delvareeff76872011-11-04 12:00:48 +010053The chips implement 2 to 4 temperature sensors (9 for NCT6775F and NCT6776F),
542 to 5 fan rotation speed sensors, 8 to 10 analog voltage sensors, one VID
55(except for 627UHG), alarms with beep warnings (control unimplemented),
Guenter Roeckec3e5a12011-02-02 08:46:49 -080056and some automatic fan regulation strategies (plus manual fan control mode).
Rudolf Marek563daaf2006-07-05 18:15:31 +020057
Guenter Roeckec3e5a12011-02-02 08:46:49 -080058The temperature sensor sources on W82677HG-B, NCT6775F, and NCT6776F are
59configurable. temp4 and higher attributes are only reported if its temperature
60source differs from the temperature sources of the already reported temperature
61sensors. The configured source for each of the temperature sensors is provided
62in tempX_label.
Guenter Roeckd36cf322011-02-07 15:08:54 -080063
Rudolf Marek563daaf2006-07-05 18:15:31 +020064Temperatures are measured in degrees Celsius and measurement resolution is 1
Guenter Roeckec3e5a12011-02-02 08:46:49 -080065degC for temp1 and and 0.5 degC for temp2 and temp3. For temp4 and higher,
66resolution is 1 degC for W83667HG-B and 0.0 degC for NCT6775F and NCT6776F.
67An alarm is triggered when the temperature gets higher than high limit;
68it stays on until the temperature falls below the hysteresis value.
69Alarms are only supported for temp1, temp2, and temp3.
Rudolf Marek563daaf2006-07-05 18:15:31 +020070
71Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
72triggered if the rotation speed has dropped below a programmable limit. Fan
73readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or
74128) to give the readings more range or accuracy. The driver sets the most
75suitable fan divisor itself. Some fans might not be present because they
76share pins with other functions.
77
78Voltage sensors (also known as IN sensors) report their values in millivolts.
79An alarm is triggered if the voltage has crossed a programmable minimum
80or maximum limit.
81
82The driver supports automatic fan control mode known as Thermal Cruise.
83In this mode, the chip attempts to keep the measured temperature in a
84predefined temperature range. If the temperature goes out of range, fan
85is driven slower/faster to reach the predefined range again.
86
87The mode works for fan1-fan4. Mapping of temperatures to pwm outputs is as
88follows:
89
90temp1 -> pwm1
91temp2 -> pwm2
Jean Delvareeff76872011-11-04 12:00:48 +010092temp3 -> pwm3 (not on 627UHG)
Guenter Roeckc39aeda2010-08-14 21:08:55 +020093prog -> pwm4 (not on 667HG and 667HG-B; the programmable setting is not
94 supported by the driver)
Rudolf Marek563daaf2006-07-05 18:15:31 +020095
96/sys files
97----------
98
Jean Delvareeff76872011-11-04 12:00:48 +010099name - this is a standard hwmon device entry, it contains the name of
100 the device (see the prefix in the list of supported devices at
101 the top of this file)
David Hubbard657c93b2007-02-14 21:15:04 +0100102
Rudolf Marek563daaf2006-07-05 18:15:31 +0200103pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range:
104 0 (stop) to 255 (full)
105
106pwm[1-4]_enable - this file controls mode of fan/temperature control:
Daniel J Blueman41e9a062009-12-14 18:01:37 -0800107 * 1 Manual mode, write to pwm file any value 0-255 (full speed)
108 * 2 "Thermal Cruise" mode
109 * 3 "Fan Speed Cruise" mode
110 * 4 "Smart Fan III" mode
Guenter Roeckec3e5a12011-02-02 08:46:49 -0800111 * 5 "Smart Fan IV" mode
112
113 SmartFan III mode is not supported on NCT6776F.
114
115 SmartFan IV mode is configurable only if it was configured at system
116 startup, and is only supported for W83677HG-B, NCT6775F, and NCT6776F.
117 SmartFan IV operational parameters can not be configured at this time,
118 and the various pwm attributes are not used in SmartFan IV mode.
119 The attributes can be written to, which is useful if you plan to
120 configure the system for a different pwm mode. However, the information
121 returned when reading pwm attributes is unrelated to SmartFan IV
122 operation.
Daniel J Blueman41e9a062009-12-14 18:01:37 -0800123
124pwm[1-4]_mode - controls if output is PWM or DC level
125 * 0 DC output (0 - 12v)
126 * 1 PWM output
Rudolf Marek563daaf2006-07-05 18:15:31 +0200127
128Thermal Cruise mode
129-------------------
130
131If the temperature is in the range defined by:
132
Jean Delvare15fe25c2006-10-08 21:59:54 +0200133pwm[1-4]_target - set target temperature, unit millidegree Celsius
Rudolf Marek563daaf2006-07-05 18:15:31 +0200134 (range 0 - 127000)
Jean Delvare15fe25c2006-10-08 21:59:54 +0200135pwm[1-4]_tolerance - tolerance, unit millidegree Celsius (range 0 - 15000)
Rudolf Marek563daaf2006-07-05 18:15:31 +0200136
137there are no changes to fan speed. Once the temperature leaves the interval,
138fan speed increases (temp is higher) or decreases if lower than desired.
139There are defined steps and times, but not exported by the driver yet.
140
141pwm[1-4]_min_output - minimum fan speed (range 1 - 255), when the temperature
142 is below defined range.
143pwm[1-4]_stop_time - how many milliseconds [ms] must elapse to switch
144 corresponding fan off. (when the temperature was below
145 defined range).
146
147Note: last two functions are influenced by other control bits, not yet exported
148 by the driver, so a change might not have any effect.
David Hubbard657c93b2007-02-14 21:15:04 +0100149
150Implementation Details
151----------------------
152
153Future driver development should bear in mind that the following registers have
154different functions on the 627EHF and the 627DHG. Some registers also have
155different power-on default values, but BIOS should already be loading
156appropriate defaults. Note that bank selection must be performed as is currently
157done in the driver for all register addresses.
158
1590x49: only on DHG, selects temperature source for AUX fan, CPU fan0
1600x4a: not completely documented for the EHF and the DHG documentation assigns
161 different behavior to bits 7 and 6, including extending the temperature
162 input selection to SmartFan I, not just SmartFan III. Testing on the EHF
163 will reveal whether they are compatible or not.
164
1650x58: Chip ID: 0xa1=EHF 0xc1=DHG
1660x5e: only on DHG, has bits to enable "current mode" temperature detection and
167 critical temperature protection
1680x45b: only on EHF, bit 3, vin4 alarm (EHF supports 10 inputs, only 9 on DHG)
1690x552: only on EHF, vin4
1700x558: only on EHF, vin4 high limit
1710x559: only on EHF, vin4 low limit
1720x6b: only on DHG, SYS fan critical temperature
1730x6c: only on DHG, CPU fan0 critical temperature
1740x6d: only on DHG, AUX fan critical temperature
1750x6e: only on DHG, CPU fan1 critical temperature
176
1770x50-0x55 and 0x650-0x657 are marked "Test Register" for the EHF, but "Reserved
178 Register" for the DHG
179
180The DHG also supports PECI, where the DHG queries Intel CPU temperatures, and
181the ICH8 southbridge gets that data via PECI from the DHG, so that the
182southbridge drives the fans. And the DHG supports SST, a one-wire serial bus.
Jean Delvarec1e48dc2009-06-15 18:39:50 +0200183
184The DHG-P has an additional automatic fan speed control mode named Smart Fan
185(TM) III+. This mode is not yet supported by the driver.