1 Kernel driver f71805f 2 ===================== 3 4 Supported chips: 5 6 * Fintek F71805F/FG 7 8 Prefix: 'f71805f' 9 10 Addresses scanned: none, address read from Super I/O config space 11 12 Datasheet: Available from the Fintek website 13 14 * Fintek F71806F/FG 15 16 Prefix: 'f71872f' 17 18 Addresses scanned: none, address read from Super I/O config space 19 20 Datasheet: Available from the Fintek website 21 22 * Fintek F71872F/FG 23 24 Prefix: 'f71872f' 25 26 Addresses scanned: none, address read from Super I/O config space 27 28 Datasheet: Available from the Fintek website 29 30 Author: Jean Delvare <jdelvare@suse.de> 31 32 Thanks to Denis Kieft from Barracuda Networks for the donation of a 33 test system (custom Jetway K8M8MS motherboard, with CPU and RAM) and 34 for providing initial documentation. 35 36 Thanks to Kris Chen and Aaron Huang from Fintek for answering technical 37 questions and providing additional documentation. 38 39 Thanks to Chris Lin from Jetway for providing wiring schematics and 40 answering technical questions. 41 42 43 Description 44 ----------- 45 46 The Fintek F71805F/FG Super I/O chip includes complete hardware monitoring 47 capabilities. It can monitor up to 9 voltages (counting its own power 48 source), 3 fans and 3 temperature sensors. 49 50 This chip also has fan controlling features, using either DC or PWM, in 51 three different modes (one manual, two automatic). 52 53 The Fintek F71872F/FG Super I/O chip is almost the same, with two 54 additional internal voltages monitored (VSB and battery). It also features 55 6 VID inputs. The VID inputs are not yet supported by this driver. 56 57 The Fintek F71806F/FG Super-I/O chip is essentially the same as the 58 F71872F/FG, and is undistinguishable therefrom. 59 60 The driver assumes that no more than one chip is present, which seems 61 reasonable. 62 63 64 Voltage Monitoring 65 ------------------ 66 67 Voltages are sampled by an 8-bit ADC with a LSB of 8 mV. The supported 68 range is thus from 0 to 2.040 V. Voltage values outside of this range 69 need external resistors. An exception is in0, which is used to monitor 70 the chip's own power source (+3.3V), and is divided internally by a 71 factor 2. For the F71872F/FG, in9 (VSB) and in10 (battery) are also 72 divided internally by a factor 2. 73 74 The two LSB of the voltage limit registers are not used (always 0), so 75 you can only set the limits in steps of 32 mV (before scaling). 76 77 The wirings and resistor values suggested by Fintek are as follow: 78 79 ======= ======= =========== ==== ======= ============ ============== 80 in pin expected 81 name use R1 R2 divider raw val. 82 ======= ======= =========== ==== ======= ============ ============== 83 in0 VCC VCC3.3V int. int. 2.00 1.65 V 84 in1 VIN1 VTT1.2V 10K - 1.00 1.20 V 85 in2 VIN2 VRAM 100K 100K 2.00 ~1.25 V [1]_ 86 in3 VIN3 VCHIPSET 47K 100K 1.47 2.24 V [2]_ 87 in4 VIN4 VCC5V 200K 47K 5.25 0.95 V 88 in5 VIN5 +12V 200K 20K 11.00 1.05 V 89 in6 VIN6 VCC1.5V 10K - 1.00 1.50 V 90 in7 VIN7 VCORE 10K - 1.00 ~1.40 V [1]_ 91 in8 VIN8 VSB5V 200K 47K 1.00 0.95 V 92 in10 VSB VSB3.3V int. int. 2.00 1.65 V [3]_ 93 in9 VBAT VBATTERY int. int. 2.00 1.50 V [3]_ 94 ======= ======= =========== ==== ======= ============ ============== 95 96 .. [1] Depends on your hardware setup. 97 .. [2] Obviously not correct, swapping R1 and R2 would make more sense. 98 .. [3] F71872F/FG only. 99 100 These values can be used as hints at best, as motherboard manufacturers 101 are free to use a completely different setup. As a matter of fact, the 102 Jetway K8M8MS uses a significantly different setup. You will have to 103 find out documentation about your own motherboard, and edit sensors.conf 104 accordingly. 105 106 Each voltage measured has associated low and high limits, each of which 107 triggers an alarm when crossed. 108 109 110 Fan Monitoring 111 -------------- 112 113 Fan rotation speeds are reported as 12-bit values from a gated clock 114 signal. Speeds down to 366 RPM can be measured. There is no theoretical 115 high limit, but values over 6000 RPM seem to cause problem. The effective 116 resolution is much lower than you would expect, the step between different 117 register values being 10 rather than 1. 118 119 The chip assumes 2 pulse-per-revolution fans. 120 121 An alarm is triggered if the rotation speed drops below a programmable 122 limit or is too low to be measured. 123 124 125 Temperature Monitoring 126 ---------------------- 127 128 Temperatures are reported in degrees Celsius. Each temperature measured 129 has a high limit, those crossing triggers an alarm. There is an associated 130 hysteresis value, below which the temperature has to drop before the 131 alarm is cleared. 132 133 All temperature channels are external, there is no embedded temperature 134 sensor. Each channel can be used for connecting either a thermal diode 135 or a thermistor. The driver reports the currently selected mode, but 136 doesn't allow changing it. In theory, the BIOS should have configured 137 everything properly. 138 139 140 Fan Control 141 ----------- 142 143 Both PWM (pulse-width modulation) and DC fan speed control methods are 144 supported. The right one to use depends on external circuitry on the 145 motherboard, so the driver assumes that the BIOS set the method 146 properly. The driver will report the method, but won't let you change 147 it. 148 149 When the PWM method is used, you can select the operating frequency, 150 from 187.5 kHz (default) to 31 Hz. The best frequency depends on the 151 fan model. As a rule of thumb, lower frequencies seem to give better 152 control, but may generate annoying high-pitch noise. So a frequency just 153 above the audible range, such as 25 kHz, may be a good choice; if this 154 doesn't give you good linear control, try reducing it. Fintek recommends 155 not going below 1 kHz, as the fan tachometers get confused by lower 156 frequencies as well. 157 158 When the DC method is used, Fintek recommends not going below 5 V, which 159 corresponds to a pwm value of 106 for the driver. The driver doesn't 160 enforce this limit though. 161 162 Three different fan control modes are supported; the mode number is written 163 to the pwm<n>_enable file. 164 165 * 1: Manual mode 166 You ask for a specific PWM duty cycle or DC voltage by writing to the 167 pwm<n> file. 168 169 * 2: Temperature mode 170 You define 3 temperature/fan speed trip points using the 171 pwm<n>_auto_point<m>_temp and _fan files. These define a staircase 172 relationship between temperature and fan speed with two additional points 173 interpolated between the values that you define. When the temperature 174 is below auto_point1_temp the fan is switched off. 175 176 * 3: Fan speed mode 177 You ask for a specific fan speed by writing to the fan<n>_target file. 178 179 Both of the automatic modes require that pwm1 corresponds to fan1, pwm2 to 180 fan2 and pwm3 to fan3. Temperature mode also requires that temp1 corresponds 181 to pwm1 and fan1, etc.
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