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
27 Addresses scanned: from Super I/O config space (8 I/O ports)
28 Datasheet: Not publicly available
31 Addresses scanned: from Super I/O config space (8 I/O ports)
32 Datasheet: Not publicly available
35 Addresses scanned: from Super I/O config space (8 I/O ports)
36 Datasheet: Not publicly available
39 Addresses scanned: from Super I/O config space (8 I/O ports)
40 Datasheet: Not publicly available
43 Addresses scanned: from Super I/O config space (8 I/O ports)
44 Datasheet: Not publicly available
47 Addresses scanned: from Super I/O config space (8 I/O ports)
48 Datasheet: Not publicly available
49 * SiS950 [clone of IT8705F]
51 Addresses scanned: from Super I/O config space (8 I/O ports)
52 Datasheet: No longer be available
56 Jean Delvare <khali@linux-fr.org>
64 0 if vbat should report power on value, 1 if vbat should be updated after
65 each read. Default is 0. On some boards the battery voltage is provided
66 by either the battery or the onboard power supply. Only the first reading
67 at power on will be the actual battery voltage (which the chip does
68 automatically). On other boards the battery voltage is always fed to
69 the chip so can be read at any time. Excessive reading may decrease
70 battery life but no information is given in the datasheet.
72 * fix_pwm_polarity int
74 Force PWM polarity to active high (DANGEROUS). Some chips are
75 misconfigured by BIOS - PWM values would be inverted. This option tries
76 to fix this. Please contact your BIOS manufacturer and ask him for fix.
82 All the chips suported by this driver are LPC Super-I/O chips, accessed
83 through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an
84 SMBus interface to the hardware monitoring functions. This driver no
85 longer supports this interface though, as it is slower and less reliable
86 than the ISA access, and was only available on a small number of
93 This driver implements support for the IT8603E, IT8623E, IT8705F,
94 IT8712F, IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8758E,
95 IT8771E, IT8772E, IT8781F, IT8782F, IT8783E/F, and SiS950 chips.
97 These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
98 joysticks and other miscellaneous stuff. For hardware monitoring, they
99 include an 'environment controller' with 3 temperature sensors, 3 fan
100 rotation speed sensors, 8 voltage sensors, associated alarms, and chassis
103 The IT8712F and IT8716F additionally feature VID inputs, used to report
104 the Vcore voltage of the processor. The early IT8712F have 5 VID pins,
105 the IT8716F and late IT8712F have 6. They are shared with other functions
106 though, so the functionality may not be available on a given system.
108 The IT8718F and IT8720F also features VID inputs (up to 8 pins) but the value
109 is stored in the Super-I/O configuration space. Due to technical limitations,
110 this value can currently only be read once at initialization time, so
111 the driver won't notice and report changes in the VID value. The two
112 upper VID bits share their pins with voltage inputs (in5 and in6) so you
113 can't have both on a given board.
115 The IT8716F, IT8718F, IT8720F, IT8721F/IT8758E, IT8783E/F, and later IT8712F
116 revisions have support for 2 additional fans. The additional fans are supported
119 The IT8716F, IT8718F, IT8720F and IT8721F/IT8758E, IT8783E/F, and late IT8712F
120 and IT8705F also have optional 16-bit tachometer counters for fans 1 to 3. This
121 is better (no more fan clock divider mess) but not compatible with the older
122 chips and revisions. The 16-bit tachometer mode is enabled by the driver when
123 one of the above chips is detected.
125 The IT8726F is just bit enhanced IT8716F with additional hardware
126 for AMD power sequencing. Therefore the chip will appear as IT8716F
127 to userspace applications.
129 The IT8728F is considered compatible with the IT8721F, until a datasheet
130 becomes available (hopefully.)
132 Temperatures are measured in degrees Celsius. An alarm is triggered once
133 when the Overtemperature Shutdown limit is crossed.
135 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
136 triggered if the rotation speed has dropped below a programmable limit. When
137 16-bit tachometer counters aren't used, fan readings can be divided by
138 a programmable divider (1, 2, 4 or 8) to give the readings more range or
139 accuracy. With a divider of 2, the lowest representable value is around
140 2600 RPM. Not all RPM values can accurately be represented, so some rounding
143 Voltage sensors (also known as IN sensors) report their values in volts. An
144 alarm is triggered if the voltage has crossed a programmable minimum or
145 maximum limit. Note that minimum in this case always means 'closest to
146 zero'; this is important for negative voltage measurements. All voltage
147 inputs can measure voltages between 0 and 4.08 volts, with a resolution of
148 0.016 volt (except IT8721F/IT8758E and IT8728F: 0.012 volt.) The battery
149 voltage in8 does not have limit registers.
151 On the IT8721F/IT8758E/IT8783E/F, some voltage inputs are internal and scaled
152 inside the chip (in7, in8 and optionally in3). The driver handles this
153 transparently so user-space doesn't have to care.
155 The VID lines (IT8712F/IT8716F/IT8718F/IT8720F) encode the core voltage value:
156 the voltage level your processor should work with. This is hardcoded by
157 the mainboard and/or processor itself. It is a value in volts.
159 If an alarm triggers, it will remain triggered until the hardware register
160 is read at least once. This means that the cause for the alarm may already
161 have disappeared! Note that in the current implementation, all hardware
162 registers are read whenever any data is read (unless it is less than 1.5
163 seconds since the last update). This means that you can easily miss
166 Out-of-limit readings can also result in beeping, if the chip is properly
167 wired and configured. Beeping can be enabled or disabled per sensor type
168 (temperatures, voltages and fans.)
170 The IT87xx only updates its values each 1.5 seconds; reading it more often
171 will do no harm, but will return 'old' values.
173 To change sensor N to a thermistor, 'echo 4 > tempN_type' where N is 1, 2,
174 or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'.
175 Give 0 for unused sensor. Any other value is invalid. To configure this at
176 startup, consult lm_sensors's /etc/sensors.conf. (4 = thermistor;
183 The fan speed control features are limited to manual PWM mode. Automatic
184 "Smart Guardian" mode control handling is only implemented for older chips
185 (see below.) However if you want to go for "manual mode" just write 1 to
188 If you are only able to control the fan speed with very small PWM values,
189 try lowering the PWM base frequency (pwm1_freq). Depending on the fan,
190 it may give you a somewhat greater control range. The same frequency is
191 used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are
195 Automatic fan speed control (old interface)
196 -------------------------------------------
198 The driver supports the old interface to automatic fan speed control
199 which is implemented by IT8705F chips up to revision F and IT8712F
200 chips up to revision G.
202 This interface implements 4 temperature vs. PWM output trip points.
203 The PWM output of trip point 4 is always the maximum value (fan running
204 at full speed) while the PWM output of the other 3 trip points can be
205 freely chosen. The temperature of all 4 trip points can be freely chosen.
206 Additionally, trip point 1 has an hysteresis temperature attached, to
207 prevent fast switching between fan on and off.
209 The chip automatically computes the PWM output value based on the input
210 temperature, based on this simple rule: if the temperature value is
211 between trip point N and trip point N+1 then the PWM output value is
212 the one of trip point N. The automatic control mode is less flexible
213 than the manual control mode, but it reacts faster, is more robust and
214 doesn't use CPU cycles.
216 Trip points must be set properly before switching to automatic fan speed
217 control mode. The driver will perform basic integrity checks before
218 actually switching to automatic control mode.