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8     Datasheet: Provided by VIA upon request and under NDA
12 This driver is based on the driver for kernel 2.4 by Mark D. Studebaker and
15 Thanks to Joseph Chan and Fiona Gatt from VIA for providing documentation and
25 			UCH1, bit 1 maps to UCH2 and so on. Setting a bit to 1
26 			enables the thermal input of that particular UCH and
43 capabilities. It monitors 2 dedicated temperature sensor inputs (temp1 and
44 temp2), 1 dedicated voltage (in5) and 2 fans. Additionally, the chip
48 This chip also provides manual and automatic control of fan speeds (according
55 The following table shows the relationship between the vt1211 inputs and the
83 motherboard and edit sensors.conf accordingly.
96 (2) R1 and R2 for 3.3V (int) are internal to the VT1211 chip and the driver
97     performs the scaling and returns the properly scaled voltage value.
99 Each measured voltage has an associated low and high limit which triggers an
114 internal thermal diode and the driver does all the scaling for temp2 and
116 temp1 and temp3-temp7, scaling depends on the board implementation and needs
120 convert between sysfs readings and real temperatures:
124 According to the VIA VT1211 BIOS porting guide, the following gain and offset
140 pin (Vpin) is formed by a voltage divider made of the thermistor (Rth) and a
148 Rth = Ro * exp(B * (1 / T - 1 / To))   (To is 298.15K (25C) and Ro is the
151 Mingling the above two equations and assuming Rs = Ro and B = 3435 yields the
164 controls both PWM outputs but each PWM output can be individually enabled and
167 Each PWM has 4 associated distinct output duty-cycles: full, high, low and
168 off. Full and off are internally hard-wired to 255 (100%) and 0 (0%),
169 respectively. High and low can be programmed via
171 different thermal input but - and here's the weird part - only one set of
175 registers in the VT1211 and programming one set is sufficient (actually only