Module Parameters¶

• vref: int

  Default: 1250 (mV)

  Reference voltage on VREF_ADC pin in mV. It should not be necessary to setthis parameter unless a non-default reference voltage is used.

Description¶

[From datasheet] The SMM665 is an Active DC Output power supply Controllerthat monitors, margins and cascade sequences power. The part monitors sixpower supply channels as well as VDD, 12V input, two general-purpose analoginputs and an internal temperature sensor using a 10-bit ADC.

Each monitored channel has its own high and low limits, plus a criticallimit.

Support for SMM465, SMM764, and SMM766 has been implemented but is untested.

Usage Notes¶

This driver does not probe for devices, since there is no register whichcan be safely used to identify the chip. You will have to instantiatethe devices explicitly. When instantiating the device, you have to specifyits configuration register address.

Example: the following will load the driver for an SMM665 at address 0x57on I2C bus #1:

$ modprobe smm665$ echo smm665 0x57 > /sys/bus/i2c/devices/i2c-1/new_device

Sysfs entries¶

This driver uses the values in the datasheet to convert ADC register valuesinto the values specified in the sysfs-interface document. All attributes areread only.

Min, max, lcrit, and crit values are used by the chip to trigger external signalsand/or other activity. Triggered signals can include HEALTHY, RST, Power Off,or Fault depending on the chip configuration. The driver reports values as lcritor crit if exceeding the limits triggers RST, Power Off, or Fault, and as min ormax otherwise. For details please see the SMM665 datasheet.

For SMM465 and SMM764, values for Channel E and F are reported but undefined.