7 Addresses scanned: from Super I/O config space (8 I/O ports)
8 Datasheet: Once publicly available at the ITE website, but no longer
11 Addresses scanned: from Super I/O config space (8 I/O ports)
12 Datasheet: Once publicly available at the ITE website, but no longer
15 Addresses scanned: from Super I/O config space (8 I/O ports)
16 Datasheet: Once publicly available at the ITE website, but no longer
19 Addresses scanned: from Super I/O config space (8 I/O ports)
20 Datasheet: Once publicly available at the ITE website, but no longer
23 Addresses scanned: from Super I/O config space (8 I/O ports)
24 Datasheet: Not publicly available
25 * SiS950 [clone of IT8705F]
27 Addresses scanned: from Super I/O config space (8 I/O ports)
28 Datasheet: No longer be available
32 Jean Delvare <khali@linux-fr.org>
40 0 if vbat should report power on value, 1 if vbat should be updated after
41 each read. Default is 0. On some boards the battery voltage is provided
42 by either the battery or the onboard power supply. Only the first reading
43 at power on will be the actual battery voltage (which the chip does
44 automatically). On other boards the battery voltage is always fed to
45 the chip so can be read at any time. Excessive reading may decrease
46 battery life but no information is given in the datasheet.
48 * fix_pwm_polarity int
50 Force PWM polarity to active high (DANGEROUS). Some chips are
51 misconfigured by BIOS - PWM values would be inverted. This option tries
52 to fix this. Please contact your BIOS manufacturer and ask him for fix.
58 All the chips suported by this driver are LPC Super-I/O chips, accessed
59 through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an
60 SMBus interface to the hardware monitoring functions. This driver no
61 longer supports this interface though, as it is slower and less reliable
62 than the ISA access, and was only available on a small number of
69 This driver implements support for the IT8705F, IT8712F, IT8716F,
70 IT8718F, IT8720F, IT8726F and SiS950 chips.
72 These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
73 joysticks and other miscellaneous stuff. For hardware monitoring, they
74 include an 'environment controller' with 3 temperature sensors, 3 fan
75 rotation speed sensors, 8 voltage sensors, and associated alarms.
77 The IT8712F and IT8716F additionally feature VID inputs, used to report
78 the Vcore voltage of the processor. The early IT8712F have 5 VID pins,
79 the IT8716F and late IT8712F have 6. They are shared with other functions
80 though, so the functionality may not be available on a given system.
82 The IT8718F and IT8720F also features VID inputs (up to 8 pins) but the value
83 is stored in the Super-I/O configuration space. Due to technical limitations,
84 this value can currently only be read once at initialization time, so
85 the driver won't notice and report changes in the VID value. The two
86 upper VID bits share their pins with voltage inputs (in5 and in6) so you
87 can't have both on a given board.
89 The IT8716F, IT8718F, IT8720F and later IT8712F revisions have support for
90 2 additional fans. The additional fans are supported by the driver.
92 The IT8716F, IT8718F and IT8720F, and late IT8712F and IT8705F also have
93 optional 16-bit tachometer counters for fans 1 to 3. This is better (no more
94 fan clock divider mess) but not compatible with the older chips and
95 revisions. The 16-bit tachometer mode is enabled by the driver when one
96 of the above chips is detected.
98 The IT8726F is just bit enhanced IT8716F with additional hardware
99 for AMD power sequencing. Therefore the chip will appear as IT8716F
100 to userspace applications.
102 Temperatures are measured in degrees Celsius. An alarm is triggered once
103 when the Overtemperature Shutdown limit is crossed.
105 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
106 triggered if the rotation speed has dropped below a programmable limit. When
107 16-bit tachometer counters aren't used, fan readings can be divided by
108 a programmable divider (1, 2, 4 or 8) to give the readings more range or
109 accuracy. With a divider of 2, the lowest representable value is around
110 2600 RPM. Not all RPM values can accurately be represented, so some rounding
113 Voltage sensors (also known as IN sensors) report their values in volts. An
114 alarm is triggered if the voltage has crossed a programmable minimum or
115 maximum limit. Note that minimum in this case always means 'closest to
116 zero'; this is important for negative voltage measurements. All voltage
117 inputs can measure voltages between 0 and 4.08 volts, with a resolution of
118 0.016 volt. The battery voltage in8 does not have limit registers.
120 The VID lines (IT8712F/IT8716F/IT8718F/IT8720F) encode the core voltage value:
121 the voltage level your processor should work with. This is hardcoded by
122 the mainboard and/or processor itself. It is a value in volts.
124 If an alarm triggers, it will remain triggered until the hardware register
125 is read at least once. This means that the cause for the alarm may already
126 have disappeared! Note that in the current implementation, all hardware
127 registers are read whenever any data is read (unless it is less than 1.5
128 seconds since the last update). This means that you can easily miss
131 Out-of-limit readings can also result in beeping, if the chip is properly
132 wired and configured. Beeping can be enabled or disabled per sensor type
133 (temperatures, voltages and fans.)
135 The IT87xx only updates its values each 1.5 seconds; reading it more often
136 will do no harm, but will return 'old' values.
138 To change sensor N to a thermistor, 'echo 4 > tempN_type' where N is 1, 2,
139 or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'.
140 Give 0 for unused sensor. Any other value is invalid. To configure this at
141 startup, consult lm_sensors's /etc/sensors.conf. (4 = thermistor;
148 The fan speed control features are limited to manual PWM mode. Automatic
149 "Smart Guardian" mode control handling is only implemented for older chips
150 (see below.) However if you want to go for "manual mode" just write 1 to
153 If you are only able to control the fan speed with very small PWM values,
154 try lowering the PWM base frequency (pwm1_freq). Depending on the fan,
155 it may give you a somewhat greater control range. The same frequency is
156 used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are
160 Automatic fan speed control (old interface)
161 -------------------------------------------
163 The driver supports the old interface to automatic fan speed control
164 which is implemented by IT8705F chips up to revision F and IT8712F
165 chips up to revision G.
167 This interface implements 4 temperature vs. PWM output trip points.
168 The PWM output of trip point 4 is always the maximum value (fan running
169 at full speed) while the PWM output of the other 3 trip points can be
170 freely chosen. The temperature of all 4 trip points can be freely chosen.
171 Additionally, trip point 1 has an hysteresis temperature attached, to
172 prevent fast switching between fan on and off.
174 The chip automatically computes the PWM output value based on the input
175 temperature, based on this simple rule: if the temperature value is
176 between trip point N and trip point N+1 then the PWM output value is
177 the one of trip point N. The automatic control mode is less flexible
178 than the manual control mode, but it reacts faster, is more robust and
179 doesn't use CPU cycles.