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    Subject[PATCH v5 2/3] hwmon: SMM665 driver documentation
    Signed-off-by: Guenter Roeck <>
    Acked-by: Jonathan Cameron <>
    Documentation/hwmon/smm665 | 157 ++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 157 insertions(+), 0 deletions(-)
    create mode 100644 Documentation/hwmon/smm665

    diff --git a/Documentation/hwmon/smm665 b/Documentation/hwmon/smm665
    new file mode 100644
    index 0000000..358ecc0
    --- /dev/null
    +++ b/Documentation/hwmon/smm665
    @@ -0,0 +1,157 @@
    +Kernel driver smm665
    +Supported chips:
    + * Summit Microelectronics SMM465
    + Prefix: 'smm465'
    + Addresses scanned: -
    + Datasheet:
    + * Summit Microelectronics SMM665, SMM665B
    + Prefix: 'smm665'
    + Addresses scanned: -
    + Datasheet:
    + * Summit Microelectronics SMM665C
    + Prefix: 'smm665c'
    + Addresses scanned: -
    + Datasheet:
    + * Summit Microelectronics SMM764
    + Prefix: 'smm764'
    + Addresses scanned: -
    + Datasheet:
    + * Summit Microelectronics SMM766, SMM766B
    + Prefix: 'smm766'
    + Addresses scanned: -
    + Datasheets:
    +Author: Guenter Roeck <>
    +Module Parameters
    +* vref: int
    + Default: 1250 (mV)
    + Reference voltage on VREF_ADC pin in mV. It should not be necessary to set
    + this parameter unless a non-default reference voltage is used.
    +[From datasheet] The SMM665 is an Active DC Output power supply Controller
    +that monitors, margins and cascade sequences power. The part monitors six
    +power supply channels as well as VDD, 12V input, two general-purpose analog
    +inputs and an internal temperature sensor using a 10-bit ADC.
    +Each monitored channel has its own high and low limits, plus a critical
    +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 which
    +can be safely used to identify the chip. You will have to instantiate
    +the devices explicitly. When instantiating the device, you have to specify
    +its configuration register address.
    +Example: the following will load the driver for an SMM665 at address 0x57
    +on 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 values
    +into the values specified in the sysfs-interface document. All attributes are
    +read only.
    +Min, max, lcrit, and crit values are used by the chip to trigger external signals
    +and/or other activity. Triggered signals can include HEALTHY, RST, Power Off,
    +or Fault depending on the chip configuration. The driver reports values as lcrit
    +or crit if exceeding the limits triggers RST, Power Off, or Fault, and as min or
    +max otherwise. For details please see the SMM665 datasheet.
    +For SMM465 and SMM764, values for Channel E and F are reported but undefined.
    +in1_input 12V input voltage (mV)
    +in2_input 3.3V (VDD) input voltage (mV)
    +in3_input Channel A voltage (mV)
    +in4_input Channel B voltage (mV)
    +in5_input Channel C voltage (mV)
    +in6_input Channel D voltage (mV)
    +in7_input Channel E voltage (mV)
    +in8_input Channel F voltage (mV)
    +in9_input AIN1 voltage (mV)
    +in10_input AIN2 voltage (mV)
    +in1_min 12v input minimum voltage (mV)
    +in2_min 3.3V (VDD) input minimum voltage (mV)
    +in3_min Channel A minimum voltage (mV)
    +in4_min Channel B minimum voltage (mV)
    +in5_min Channel C minimum voltage (mV)
    +in6_min Channel D minimum voltage (mV)
    +in7_min Channel E minimum voltage (mV)
    +in8_min Channel F minimum voltage (mV)
    +in9_min AIN1 minimum voltage (mV)
    +in10_min AIN2 minimum voltage (mV)
    +in1_max 12v input maximum voltage (mV)
    +in2_max 3.3V (VDD) input maximum voltage (mV)
    +in3_max Channel A maximum voltage (mV)
    +in4_max Channel B maximum voltage (mV)
    +in5_max Channel C maximum voltage (mV)
    +in6_max Channel D maximum voltage (mV)
    +in7_max Channel E maximum voltage (mV)
    +in8_max Channel F maximum voltage (mV)
    +in9_max AIN1 maximum voltage (mV)
    +in10_max AIN2 maximum voltage (mV)
    +in1_lcrit 12v input critical minimum voltage (mV)
    +in2_lcrit 3.3V (VDD) input critical minimum voltage (mV)
    +in3_lcrit Channel A critical minimum voltage (mV)
    +in4_lcrit Channel B critical minimum voltage (mV)
    +in5_lcrit Channel C critical minimum voltage (mV)
    +in6_lcrit Channel D critical minimum voltage (mV)
    +in7_lcrit Channel E critical minimum voltage (mV)
    +in8_lcrit Channel F critical minimum voltage (mV)
    +in9_lcrit AIN1 critical minimum voltage (mV)
    +in10_lcrit AIN2 critical minimum voltage (mV)
    +in1_crit 12v input critical maximum voltage (mV)
    +in2_crit 3.3V (VDD) input critical maximum voltage (mV)
    +in3_crit Channel A critical maximum voltage (mV)
    +in4_crit Channel B critical maximum voltage (mV)
    +in5_crit Channel C critical maximum voltage (mV)
    +in6_crit Channel D critical maximum voltage (mV)
    +in7_crit Channel E critical maximum voltage (mV)
    +in8_crit Channel F critical maximum voltage (mV)
    +in9_crit AIN1 critical maximum voltage (mV)
    +in10_crit AIN2 critical maximum voltage (mV)
    +in1_fault 12v input fault
    +in2_fault 3.3V (VDD) input fault
    +in3_fault Channel A fault
    +in4_fault Channel B fault
    +in5_fault Channel C fault
    +in6_fault Channel D fault
    +in7_fault Channel E fault
    +in8_fault Channel F fault
    +in9_fault AIN1 fault
    +in10_fault AIN2 fault
    +temp1_input Chip tempererature
    +temp1_min Mimimum chip tempererature
    +temp1_max Maximum chip tempererature
    +temp1_crit Critical chip tempererature
    +temp1_fault Temperature fault

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