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
51 Addresses scanned: from Super I/O config space (8 I/O ports)
52 Datasheet: Not publicly available
53 * SiS950 [clone of IT8705F]
55 Addresses scanned: from Super I/O config space (8 I/O ports)
56 Datasheet: No longer be available
60 Jean Delvare <khali@linux-fr.org>
68 0 if vbat should report power on value, 1 if vbat should be updated after
69 each read. Default is 0. On some boards the battery voltage is provided
70 by either the battery or the onboard power supply. Only the first reading
71 at power on will be the actual battery voltage (which the chip does
72 automatically). On other boards the battery voltage is always fed to
73 the chip so can be read at any time. Excessive reading may decrease
74 battery life but no information is given in the datasheet.
76 * fix_pwm_polarity int
78 Force PWM polarity to active high (DANGEROUS). Some chips are
79 misconfigured by BIOS - PWM values would be inverted. This option tries
80 to fix this. Please contact your BIOS manufacturer and ask him for fix.
86 All the chips suported by this driver are LPC Super-I/O chips, accessed
87 through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an
88 SMBus interface to the hardware monitoring functions. This driver no
89 longer supports this interface though, as it is slower and less reliable
90 than the ISA access, and was only available on a small number of
97 This driver implements support for the IT8705F, IT8712F, IT8716F,
98 IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8758E, IT8387E/F,
101 These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
102 joysticks and other miscellaneous stuff. For hardware monitoring, they
103 include an 'environment controller' with 3 temperature sensors, 3 fan
104 rotation speed sensors, 8 voltage sensors, associated alarms, and chassis
107 The IT8712F and IT8716F additionally feature VID inputs, used to report
108 the Vcore voltage of the processor. The early IT8712F have 5 VID pins,
109 the IT8716F and late IT8712F have 6. They are shared with other functions
110 though, so the functionality may not be available on a given system.
112 The IT8718F and IT8720F also features VID inputs (up to 8 pins) but the value
113 is stored in the Super-I/O configuration space. Due to technical limitations,
114 this value can currently only be read once at initialization time, so
115 the driver won't notice and report changes in the VID value. The two
116 upper VID bits share their pins with voltage inputs (in5 and in6) so you
117 can't have both on a given board.
119 The IT8716F, IT8718F, IT8720F, IT8721F/IT8758E, IT8783E/F, and later IT8712F
120 revisions have support for 2 additional fans. The additional fans are supported
123 The IT8716F, IT8718F, IT8720F and IT8721F/IT8758E, IT8783E/F, and late IT8712F
124 and IT8705F also have optional 16-bit tachometer counters for fans 1 to 3. This
125 is better (no more fan clock divider mess) but not compatible with the older
126 chips and revisions. The 16-bit tachometer mode is enabled by the driver when
127 one of the above chips is detected.
129 The IT8726F is just bit enhanced IT8716F with additional hardware
130 for AMD power sequencing. Therefore the chip will appear as IT8716F
131 to userspace applications.
133 The IT8728F is considered compatible with the IT8721F, until a datasheet
134 becomes available (hopefully.)
136 Temperatures are measured in degrees Celsius. An alarm is triggered once
137 when the Overtemperature Shutdown limit is crossed.
139 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
140 triggered if the rotation speed has dropped below a programmable limit. When
141 16-bit tachometer counters aren't used, fan readings can be divided by
142 a programmable divider (1, 2, 4 or 8) to give the readings more range or
143 accuracy. With a divider of 2, the lowest representable value is around
144 2600 RPM. Not all RPM values can accurately be represented, so some rounding
147 Voltage sensors (also known as IN sensors) report their values in volts. An
148 alarm is triggered if the voltage has crossed a programmable minimum or
149 maximum limit. Note that minimum in this case always means 'closest to
150 zero'; this is important for negative voltage measurements. All voltage
151 inputs can measure voltages between 0 and 4.08 volts, with a resolution of
152 0.016 volt (except IT8721F/IT8758E and IT8728F: 0.012 volt.) The battery
153 voltage in8 does not have limit registers.
155 On the IT8721F/IT8758E/IT8783E/F, some voltage inputs are internal and scaled
156 inside the chip (in7, in8 and optionally in3). The driver handles this
157 transparently so user-space doesn't have to care.
159 The VID lines (IT8712F/IT8716F/IT8718F/IT8720F) encode the core voltage value:
160 the voltage level your processor should work with. This is hardcoded by
161 the mainboard and/or processor itself. It is a value in volts.
163 If an alarm triggers, it will remain triggered until the hardware register
164 is read at least once. This means that the cause for the alarm may already
165 have disappeared! Note that in the current implementation, all hardware
166 registers are read whenever any data is read (unless it is less than 1.5
167 seconds since the last update). This means that you can easily miss
170 Out-of-limit readings can also result in beeping, if the chip is properly
171 wired and configured. Beeping can be enabled or disabled per sensor type
172 (temperatures, voltages and fans.)
174 The IT87xx only updates its values each 1.5 seconds; reading it more often
175 will do no harm, but will return 'old' values.
177 To change sensor N to a thermistor, 'echo 4 > tempN_type' where N is 1, 2,
178 or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'.
179 Give 0 for unused sensor. Any other value is invalid. To configure this at
180 startup, consult lm_sensors's /etc/sensors.conf. (4 = thermistor;
187 The fan speed control features are limited to manual PWM mode. Automatic
188 "Smart Guardian" mode control handling is only implemented for older chips
189 (see below.) However if you want to go for "manual mode" just write 1 to
192 If you are only able to control the fan speed with very small PWM values,
193 try lowering the PWM base frequency (pwm1_freq). Depending on the fan,
194 it may give you a somewhat greater control range. The same frequency is
195 used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are
199 Automatic fan speed control (old interface)
200 -------------------------------------------
202 The driver supports the old interface to automatic fan speed control
203 which is implemented by IT8705F chips up to revision F and IT8712F
204 chips up to revision G.
206 This interface implements 4 temperature vs. PWM output trip points.
207 The PWM output of trip point 4 is always the maximum value (fan running
208 at full speed) while the PWM output of the other 3 trip points can be
209 freely chosen. The temperature of all 4 trip points can be freely chosen.
210 Additionally, trip point 1 has an hysteresis temperature attached, to
211 prevent fast switching between fan on and off.
213 The chip automatically computes the PWM output value based on the input
214 temperature, based on this simple rule: if the temperature value is
215 between trip point N and trip point N+1 then the PWM output value is
216 the one of trip point N. The automatic control mode is less flexible
217 than the manual control mode, but it reacts faster, is more robust and
218 doesn't use CPU cycles.
220 Trip points must be set properly before switching to automatic fan speed
221 control mode. The driver will perform basic integrity checks before
222 actually switching to automatic control mode.