cf583b4275
The dual tachometer feature is implemented in hardware with a TACHSEL input to indicate the rotor under measurement, and exposed on the device by extending the READ_FAN_SPEED_1 word with two extra bytes*. The need to read the non-standard four-byte response leads to a cut-down implementation of i2c_smbus_xfer_emulated() included in the driver. Further, to expose the second rotor tachometer value to userspace the values are exposed through virtual pages. We re-route accesses to FAN_CONFIG_1_2 and READ_FAN_SPEED_1 on pages 23-28 (not defined by the hardware) to the same registers on pages 0-5, and with the latter command we extract the value from the second word of the four-byte response. * The documentation recommends the slower rotor be associated with TACHSEL=0, which corresponds to the first word of the response. The TACHSEL=0 measurement is used by the controller's closed-loop fan management to judge target fan rate. Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Guenter Roeck <linux@roeck-us.net> |
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| .. | ||
| ab8500 | ||
| abituguru | ||
| abituguru-datasheet | ||
| abituguru3 | ||
| abx500 | ||
| acpi_power_meter | ||
| ad7314 | ||
| adc128d818 | ||
| adm1021 | ||
| adm1025 | ||
| adm1026 | ||
| adm1031 | ||
| adm1275 | ||
| adm9240 | ||
| ads1015 | ||
| ads7828 | ||
| adt7410 | ||
| adt7411 | ||
| adt7462 | ||
| adt7470 | ||
| adt7475 | ||
| amc6821 | ||
| asb100 | ||
| asc7621 | ||
| aspeed-pwm-tacho | ||
| coretemp | ||
| da9052 | ||
| da9055 | ||
| dme1737 | ||
| ds620 | ||
| ds1621 | ||
| emc6w201 | ||
| emc1403 | ||
| emc2103 | ||
| f71805f | ||
| f71882fg | ||
| fam15h_power | ||
| ftsteutates | ||
| g760a | ||
| g762 | ||
| gl518sm | ||
| hih6130 | ||
| hwmon-kernel-api.txt | ||
| ibm-cffps | ||
| ibmaem | ||
| ibmpowernv | ||
| ina2xx | ||
| ina209 | ||
| ina3221 | ||
| ir35221 | ||
| it87 | ||
| jc42 | ||
| k8temp | ||
| k10temp | ||
| lineage-pem | ||
| lm63 | ||
| lm70 | ||
| lm73 | ||
| lm75 | ||
| lm77 | ||
| lm78 | ||
| lm80 | ||
| lm83 | ||
| lm85 | ||
| lm87 | ||
| lm90 | ||
| lm92 | ||
| lm93 | ||
| lm25066 | ||
| lm95234 | ||
| lm95245 | ||
| ltc2945 | ||
| ltc2978 | ||
| ltc2990 | ||
| ltc3815 | ||
| ltc4151 | ||
| ltc4215 | ||
| ltc4245 | ||
| ltc4260 | ||
| ltc4261 | ||
| max197 | ||
| max1619 | ||
| max1668 | ||
| max6639 | ||
| max6642 | ||
| max6650 | ||
| max6697 | ||
| max8688 | ||
| max16064 | ||
| max16065 | ||
| max20751 | ||
| max31722 | ||
| max31785 | ||
| max31790 | ||
| max34440 | ||
| mc13783-adc | ||
| mcp3021 | ||
| menf21bmc | ||
| nct6683 | ||
| nct6775 | ||
| nct7802 | ||
| nct7904 | ||
| nsa320 | ||
| ntc_thermistor | ||
| pc87360 | ||
| pc87427 | ||
| pcf8591 | ||
| pmbus | ||
| pmbus-core | ||
| powr1220 | ||
| pwm-fan | ||
| sch5627 | ||
| sch5636 | ||
| scpi-hwmon | ||
| sht3x | ||
| sht15 | ||
| sht21 | ||
| shtc1 | ||
| sis5595 | ||
| smm665 | ||
| smsc47b397 | ||
| smsc47m1 | ||
| smsc47m192 | ||
| submitting-patches | ||
| sysfs-interface | ||
| tc74 | ||
| tc654 | ||
| thmc50 | ||
| tmp102 | ||
| tmp103 | ||
| tmp108 | ||
| tmp401 | ||
| tmp421 | ||
| tps40422 | ||
| twl4030-madc-hwmon | ||
| ucd9000 | ||
| ucd9200 | ||
| userspace-tools | ||
| vexpress | ||
| via686a | ||
| vt1211 | ||
| w83l785ts | ||
| w83l786ng | ||
| w83627ehf | ||
| w83627hf | ||
| w83773g | ||
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| w83791d | ||
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| w83793 | ||
| w83795 | ||
| wm831x | ||
| wm8350 | ||
| xgene-hwmon | ||
| zl6100 | ||