7 Addresses scanned: from Super I/O config space (8 I/O ports)
8 Datasheet: Not publicly available
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: Once publicly available at the ITE website, but no longer
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
55 Addresses scanned: from Super I/O config space (8 I/O ports)
56 Datasheet: Not publicly available
59 Addresses scanned: from Super I/O config space (8 I/O ports)
60 Datasheet: Not publicly available
61 * SiS950 [clone of IT8705F]
63 Addresses scanned: from Super I/O config space (8 I/O ports)
64 Datasheet: No longer be available
68 Jean Delvare <jdelvare@suse.de>
76 0 if vbat should report power on value, 1 if vbat should be updated after
77 each read. Default is 0. On some boards the battery voltage is provided
78 by either the battery or the onboard power supply. Only the first reading
79 at power on will be the actual battery voltage (which the chip does
80 automatically). On other boards the battery voltage is always fed to
81 the chip so can be read at any time. Excessive reading may decrease
82 battery life but no information is given in the datasheet.
84 * fix_pwm_polarity int
86 Force PWM polarity to active high (DANGEROUS). Some chips are
87 misconfigured by BIOS - PWM values would be inverted. This option tries
88 to fix this. Please contact your BIOS manufacturer and ask him for fix.
94 All the chips supported by this driver are LPC Super-I/O chips, accessed
95 through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an
96 SMBus interface to the hardware monitoring functions. This driver no
97 longer supports this interface though, as it is slower and less reliable
98 than the ISA access, and was only available on a small number of
105 This driver implements support for the IT8603E, IT8623E, IT8705F, IT8712F,
106 IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8758E, IT8771E,
107 IT8772E, IT8781F, IT8782F, IT8783E/F, IT8786E, and SiS950 chips.
109 These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
110 joysticks and other miscellaneous stuff. For hardware monitoring, they
111 include an 'environment controller' with 3 temperature sensors, 3 fan
112 rotation speed sensors, 8 voltage sensors, associated alarms, and chassis
115 The IT8712F and IT8716F additionally feature VID inputs, used to report
116 the Vcore voltage of the processor. The early IT8712F have 5 VID pins,
117 the IT8716F and late IT8712F have 6. They are shared with other functions
118 though, so the functionality may not be available on a given system.
120 The IT8718F and IT8720F also features VID inputs (up to 8 pins) but the value
121 is stored in the Super-I/O configuration space. Due to technical limitations,
122 this value can currently only be read once at initialization time, so
123 the driver won't notice and report changes in the VID value. The two
124 upper VID bits share their pins with voltage inputs (in5 and in6) so you
125 can't have both on a given board.
127 The IT8716F, IT8718F, IT8720F, IT8721F/IT8758E and later IT8712F revisions
128 have support for 2 additional fans. The additional fans are supported by the
131 The IT8716F, IT8718F, IT8720F, IT8721F/IT8758E, IT8781F, IT8782F, IT8783E/F,
132 and late IT8712F and IT8705F also have optional 16-bit tachometer counters
133 for fans 1 to 3. This is better (no more fan clock divider mess) but not
134 compatible with the older chips and revisions. The 16-bit tachometer mode
135 is enabled by the driver when one of the above chips is detected.
137 The IT8726F is just bit enhanced IT8716F with additional hardware
138 for AMD power sequencing. Therefore the chip will appear as IT8716F
139 to userspace applications.
141 The IT8728F, IT8771E, and IT8772E are considered compatible with the IT8721F,
142 until a datasheet becomes available (hopefully.)
144 The IT8603E/IT8623E is a custom design, hardware monitoring part is similar to
145 IT8728F. It only supports 16-bit fan mode, the full speed mode of the
146 fan is not supported (value 0 of pwmX_enable).
148 Temperatures are measured in degrees Celsius. An alarm is triggered once
149 when the Overtemperature Shutdown limit is crossed.
151 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
152 triggered if the rotation speed has dropped below a programmable limit. When
153 16-bit tachometer counters aren't used, fan readings can be divided by
154 a programmable divider (1, 2, 4 or 8) to give the readings more range or
155 accuracy. With a divider of 2, the lowest representable value is around
156 2600 RPM. Not all RPM values can accurately be represented, so some rounding
159 Voltage sensors (also known as IN sensors) report their values in volts. An
160 alarm is triggered if the voltage has crossed a programmable minimum or
161 maximum limit. Note that minimum in this case always means 'closest to
162 zero'; this is important for negative voltage measurements. All voltage
163 inputs can measure voltages between 0 and 4.08 volts, with a resolution of
164 0.016 volt (except IT8603E, IT8721F/IT8758E and IT8728F: 0.012 volt.) The
165 battery voltage in8 does not have limit registers.
167 On the IT8603E, IT8721F/IT8758E, IT8781F, IT8782F, and IT8783E/F, some
168 voltage inputs are internal and scaled inside the chip:
170 * in7 (optional for IT8781F, IT8782F, and IT8783E/F)
172 * in9 (relevant for IT8603E only)
173 The driver handles this transparently so user-space doesn't have to care.
175 The VID lines (IT8712F/IT8716F/IT8718F/IT8720F) encode the core voltage value:
176 the voltage level your processor should work with. This is hardcoded by
177 the mainboard and/or processor itself. It is a value in volts.
179 If an alarm triggers, it will remain triggered until the hardware register
180 is read at least once. This means that the cause for the alarm may already
181 have disappeared! Note that in the current implementation, all hardware
182 registers are read whenever any data is read (unless it is less than 1.5
183 seconds since the last update). This means that you can easily miss
186 Out-of-limit readings can also result in beeping, if the chip is properly
187 wired and configured. Beeping can be enabled or disabled per sensor type
188 (temperatures, voltages and fans.)
190 The IT87xx only updates its values each 1.5 seconds; reading it more often
191 will do no harm, but will return 'old' values.
193 To change sensor N to a thermistor, 'echo 4 > tempN_type' where N is 1, 2,
194 or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'.
195 Give 0 for unused sensor. Any other value is invalid. To configure this at
196 startup, consult lm_sensors's /etc/sensors.conf. (4 = thermistor;
203 The fan speed control features are limited to manual PWM mode. Automatic
204 "Smart Guardian" mode control handling is only implemented for older chips
205 (see below.) However if you want to go for "manual mode" just write 1 to
208 If you are only able to control the fan speed with very small PWM values,
209 try lowering the PWM base frequency (pwm1_freq). Depending on the fan,
210 it may give you a somewhat greater control range. The same frequency is
211 used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are
215 Automatic fan speed control (old interface)
216 -------------------------------------------
218 The driver supports the old interface to automatic fan speed control
219 which is implemented by IT8705F chips up to revision F and IT8712F
220 chips up to revision G.
222 This interface implements 4 temperature vs. PWM output trip points.
223 The PWM output of trip point 4 is always the maximum value (fan running
224 at full speed) while the PWM output of the other 3 trip points can be
225 freely chosen. The temperature of all 4 trip points can be freely chosen.
226 Additionally, trip point 1 has an hysteresis temperature attached, to
227 prevent fast switching between fan on and off.
229 The chip automatically computes the PWM output value based on the input
230 temperature, based on this simple rule: if the temperature value is
231 between trip point N and trip point N+1 then the PWM output value is
232 the one of trip point N. The automatic control mode is less flexible
233 than the manual control mode, but it reacts faster, is more robust and
234 doesn't use CPU cycles.
236 Trip points must be set properly before switching to automatic fan speed
237 control mode. The driver will perform basic integrity checks before
238 actually switching to automatic control mode.
241 Temperature offset attributes
242 -----------------------------
244 The driver supports temp[1-3]_offset sysfs attributes to adjust the reported
245 temperature for thermal diodes or diode-connected thermal transistors.
246 If a temperature sensor is configured for thermistors, the attribute values
247 are ignored. If the thermal sensor type is Intel PECI, the temperature offset
248 must be programmed to the critical CPU temperature.