Kernel driver ucd9200

Supported chips:

Author: Guenter Roeck <linux@roeck-us.net>

Description

[From datasheets] UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and UCD9248 are multi-rail, multi-phase synchronous buck digital PWM controllers designed for non-isolated DC/DC power applications. The devices integrate dedicated circuitry for DC/DC loop management with flash memory and a serial interface to support configuration, monitoring and management.

This driver is a client driver to the core PMBus driver. Please see Documentation/hwmon/pmbus.rst for details on PMBus client drivers.

Usage Notes

This driver does not auto-detect devices. You will have to instantiate the devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for details.

Platform data support

The driver supports standard PMBus driver platform data. Please see Documentation/hwmon/pmbus.rst for details.

Sysfs entries

The following attributes are supported. Limits are read-write; all other attributes are read-only.

in1_label

“vin”.

in1_input

Measured voltage. From READ_VIN register.

in1_min

Minimum Voltage. From VIN_UV_WARN_LIMIT register.

in1_max

Maximum voltage. From VIN_OV_WARN_LIMIT register.

in1_lcrit

Critical minimum Voltage. VIN_UV_FAULT_LIMIT register.

in1_crit

Critical maximum voltage. From VIN_OV_FAULT_LIMIT register.

in1_min_alarm

Voltage low alarm. From VIN_UV_WARNING status.

in1_max_alarm

Voltage high alarm. From VIN_OV_WARNING status.

in1_lcrit_alarm

Voltage critical low alarm. From VIN_UV_FAULT status.

in1_crit_alarm

Voltage critical high alarm. From VIN_OV_FAULT status.

in[2-5]_label

“vout[1-4]”.

in[2-5]_input

Measured voltage. From READ_VOUT register.

in[2-5]_min

Minimum Voltage. From VOUT_UV_WARN_LIMIT register.

in[2-5]_max

Maximum voltage. From VOUT_OV_WARN_LIMIT register.

in[2-5]_lcrit

Critical minimum Voltage. VOUT_UV_FAULT_LIMIT register.

in[2-5]_crit

Critical maximum voltage. From VOUT_OV_FAULT_LIMIT register.

in[2-5]_min_alarm

Voltage low alarm. From VOLTAGE_UV_WARNING status.

in[2-5]_max_alarm

Voltage high alarm. From VOLTAGE_OV_WARNING status.

in[2-5]_lcrit_alarm

Voltage critical low alarm. From VOLTAGE_UV_FAULT status.

in[2-5]_crit_alarm

Voltage critical high alarm. From VOLTAGE_OV_FAULT status.

curr1_label

“iin”.

curr1_input

Measured current. From READ_IIN register.

curr[2-5]_label

“iout[1-4]”.

curr[2-5]_input

Measured current. From READ_IOUT register.

curr[2-5]_max

Maximum current. From IOUT_OC_WARN_LIMIT register.

curr[2-5]_lcrit

Critical minimum output current. From IOUT_UC_FAULT_LIMIT register.

curr[2-5]_crit

Critical maximum current. From IOUT_OC_FAULT_LIMIT register.

curr[2-5]_max_alarm

Current high alarm. From IOUT_OC_WARNING status.

curr[2-5]_crit_alarm

Current critical high alarm. From IOUT_OC_FAULT status.

power1_input

Measured input power. From READ_PIN register.

power1_label

“pin”

power[2-5]_input

Measured output power. From READ_POUT register.

power[2-5]_label

“pout[1-4]”

The number of output voltage, current, and power attribute sets is determined by the number of enabled rails. See chip datasheets for details.

temp[1-5]_input

Measured temperatures. From READ_TEMPERATURE_1 and READ_TEMPERATURE_2 registers. temp1 is the chip internal temperature. temp[2-5] are rail temperatures. temp[2-5] attributes are only created for enabled rails. See chip datasheets for details.

temp[1-5]_max

Maximum temperature. From OT_WARN_LIMIT register.

temp[1-5]_crit

Critical high temperature. From OT_FAULT_LIMIT register.

temp[1-5]_max_alarm

Temperature high alarm.

temp[1-5]_crit_alarm

Temperature critical high alarm.

fan1_input

Fan RPM. ucd9240 only.

fan1_alarm

Fan alarm. ucd9240 only.

fan1_fault

Fan fault. ucd9240 only.