forked from Minki/linux
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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| .. | ||
| adm1275.c | ||
| ibm-cffps.c | ||
| ir35221.c | ||
| Kconfig | ||
| lm25066.c | ||
| ltc2978.c | ||
| ltc3815.c | ||
| Makefile | ||
| max8688.c | ||
| max16064.c | ||
| max20751.c | ||
| max31785.c | ||
| max34440.c | ||
| pmbus_core.c | ||
| pmbus.c | ||
| pmbus.h | ||
| tps40422.c | ||
| tps53679.c | ||
| ucd9000.c | ||
| ucd9200.c | ||
| zl6100.c | ||