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diff --git a/Documentation/hwmon/pmbus.rst b/Documentation/hwmon/pmbus.rst new file mode 100644 index 0000000000..eb1569bfa6 --- /dev/null +++ b/Documentation/hwmon/pmbus.rst @@ -0,0 +1,277 @@ +Kernel driver pmbus +=================== + +Supported chips: + + * Flex BMR310, BMR453, BMR454, BMR456, BMR457, BMR458, BMR480, + BMR490, BMR491, BMR492 + + Prefixes: 'bmr310', 'bmr453', 'bmr454', 'bmr456', 'bmr457', 'bmr458', 'bmr480', + 'bmr490', 'bmr491', 'bmr492' + + Addresses scanned: - + + Datasheets: + + https://flexpowermodules.com/products + + + * ON Semiconductor ADP4000, NCP4200, NCP4208 + + Prefixes: 'adp4000', 'ncp4200', 'ncp4208' + + Addresses scanned: - + + Datasheets: + + https://www.onsemi.com/pub_link/Collateral/ADP4000-D.PDF + + https://www.onsemi.com/pub_link/Collateral/NCP4200-D.PDF + + https://www.onsemi.com/pub_link/Collateral/JUNE%202009-%20REV.%200.PDF + + * Lineage Power + + Prefixes: 'mdt040', 'pdt003', 'pdt006', 'pdt012', 'udt020' + + Addresses scanned: - + + Datasheets: + + http://www.lineagepower.com/oem/pdf/PDT003A0X.pdf + + http://www.lineagepower.com/oem/pdf/PDT006A0X.pdf + + http://www.lineagepower.com/oem/pdf/PDT012A0X.pdf + + http://www.lineagepower.com/oem/pdf/UDT020A0X.pdf + + http://www.lineagepower.com/oem/pdf/MDT040A0X.pdf + + * Texas Instruments TPS40400, TPS544B20, TPS544B25, TPS544C20, TPS544C25 + + Prefixes: 'tps40400', 'tps544b20', 'tps544b25', 'tps544c20', 'tps544c25' + + Addresses scanned: - + + Datasheets: + + https://www.ti.com/lit/gpn/tps40400 + + https://www.ti.com/lit/gpn/tps544b20 + + https://www.ti.com/lit/gpn/tps544b25 + + https://www.ti.com/lit/gpn/tps544c20 + + https://www.ti.com/lit/gpn/tps544c25 + + * Maxim MAX20796 + + Prefix: 'max20796' + + Addresses scanned: - + + Datasheet: + + Not published + + * Generic PMBus devices + + Prefix: 'pmbus' + + Addresses scanned: - + + Datasheet: n.a. + + +Author: Guenter Roeck <linux@roeck-us.net> + + +Description +----------- + +This driver supports hardware monitoring for various PMBus compliant devices. +It supports voltage, current, power, and temperature sensors as supported +by the device. + +Each monitored channel has its own high and low limits, plus a critical +limit. + +Fan support will be added in a later version of this driver. + + +Usage Notes +----------- + +This driver does not probe for PMBus devices, since there is no register +which can be safely used to identify the chip (The MFG_ID register is not +supported by all chips), and since there is no well defined address range for +PMBus devices. You will have to instantiate the devices explicitly. + +Example: the following will load the driver for an LTC2978 at address 0x60 +on I2C bus #1:: + + $ modprobe pmbus + $ echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device + + +Platform data support +--------------------- + +Support for additional PMBus chips can be added by defining chip parameters in +a new chip specific driver file. For example, (untested) code to add support for +Emerson DS1200 power modules might look as follows:: + + static struct pmbus_driver_info ds1200_info = { + .pages = 1, + /* Note: All other sensors are in linear mode */ + .direct[PSC_VOLTAGE_OUT] = true, + .direct[PSC_TEMPERATURE] = true, + .direct[PSC_CURRENT_OUT] = true, + .m[PSC_VOLTAGE_IN] = 1, + .b[PSC_VOLTAGE_IN] = 0, + .R[PSC_VOLTAGE_IN] = 3, + .m[PSC_VOLTAGE_OUT] = 1, + .b[PSC_VOLTAGE_OUT] = 0, + .R[PSC_VOLTAGE_OUT] = 3, + .m[PSC_TEMPERATURE] = 1, + .b[PSC_TEMPERATURE] = 0, + .R[PSC_TEMPERATURE] = 3, + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT + | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT + | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT + | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT + | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP + | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, + }; + + static int ds1200_probe(struct i2c_client *client) + { + return pmbus_do_probe(client, &ds1200_info); + } + + static const struct i2c_device_id ds1200_id[] = { + {"ds1200", 0}, + {} + }; + + MODULE_DEVICE_TABLE(i2c, ds1200_id); + + /* This is the driver that will be inserted */ + static struct i2c_driver ds1200_driver = { + .driver = { + .name = "ds1200", + }, + .probe = ds1200_probe, + .id_table = ds1200_id, + }; + + static int __init ds1200_init(void) + { + return i2c_add_driver(&ds1200_driver); + } + + static void __exit ds1200_exit(void) + { + i2c_del_driver(&ds1200_driver); + } + + +Sysfs entries +------------- + +When probing the chip, the driver identifies which PMBus registers are +supported, and determines available sensors from this information. +Attribute files only exist if respective sensors are supported by the chip. +Labels are provided to inform the user about the sensor associated with +a given sysfs entry. + +The following attributes are supported. Limits are read-write; all other +attributes are read-only. + +======================= ======================================================== +inX_input Measured voltage. From READ_VIN or READ_VOUT register. +inX_min Minimum Voltage. + From VIN_UV_WARN_LIMIT or VOUT_UV_WARN_LIMIT register. +inX_max Maximum voltage. + From VIN_OV_WARN_LIMIT or VOUT_OV_WARN_LIMIT register. +inX_lcrit Critical minimum Voltage. + From VIN_UV_FAULT_LIMIT or VOUT_UV_FAULT_LIMIT register. +inX_crit Critical maximum voltage. + From VIN_OV_FAULT_LIMIT or VOUT_OV_FAULT_LIMIT register. +inX_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status. +inX_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status. +inX_lcrit_alarm Voltage critical low alarm. + From VOLTAGE_UV_FAULT status. +inX_crit_alarm Voltage critical high alarm. + From VOLTAGE_OV_FAULT status. +inX_label "vin", "vcap", or "voutY" +inX_rated_min Minimum rated voltage. + From MFR_VIN_MIN or MFR_VOUT_MIN register. +inX_rated_max Maximum rated voltage. + From MFR_VIN_MAX or MFR_VOUT_MAX register. + +currX_input Measured current. From READ_IIN or READ_IOUT register. +currX_max Maximum current. + From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT register. +currX_lcrit Critical minimum output current. + From IOUT_UC_FAULT_LIMIT register. +currX_crit Critical maximum current. + From IIN_OC_FAULT_LIMIT or IOUT_OC_FAULT_LIMIT register. +currX_alarm Current high alarm. + From IIN_OC_WARNING or IOUT_OC_WARNING status. +currX_max_alarm Current high alarm. + From IIN_OC_WARN_LIMIT or IOUT_OC_WARN_LIMIT status. +currX_lcrit_alarm Output current critical low alarm. + From IOUT_UC_FAULT status. +currX_crit_alarm Current critical high alarm. + From IIN_OC_FAULT or IOUT_OC_FAULT status. +currX_label "iin", "iinY", "iinY.Z", "ioutY", or "ioutY.Z", + where Y reflects the page number and Z reflects the + phase. +currX_rated_max Maximum rated current. + From MFR_IIN_MAX or MFR_IOUT_MAX register. + +powerX_input Measured power. From READ_PIN or READ_POUT register. +powerX_cap Output power cap. From POUT_MAX register. +powerX_max Power limit. From PIN_OP_WARN_LIMIT or + POUT_OP_WARN_LIMIT register. +powerX_crit Critical output power limit. + From POUT_OP_FAULT_LIMIT register. +powerX_alarm Power high alarm. + From PIN_OP_WARNING or POUT_OP_WARNING status. +powerX_crit_alarm Output power critical high alarm. + From POUT_OP_FAULT status. +powerX_label "pin", "pinY", "pinY.Z", "poutY", or "poutY.Z", + where Y reflects the page number and Z reflects the + phase. +powerX_rated_max Maximum rated power. + From MFR_PIN_MAX or MFR_POUT_MAX register. + +tempX_input Measured temperature. + From READ_TEMPERATURE_X register. +tempX_min Minimum temperature. From UT_WARN_LIMIT register. +tempX_max Maximum temperature. From OT_WARN_LIMIT register. +tempX_lcrit Critical low temperature. + From UT_FAULT_LIMIT register. +tempX_crit Critical high temperature. + From OT_FAULT_LIMIT register. +tempX_min_alarm Chip temperature low alarm. Set by comparing + READ_TEMPERATURE_X with UT_WARN_LIMIT if + TEMP_UT_WARNING status is set. +tempX_max_alarm Chip temperature high alarm. Set by comparing + READ_TEMPERATURE_X with OT_WARN_LIMIT if + TEMP_OT_WARNING status is set. +tempX_lcrit_alarm Chip temperature critical low alarm. Set by comparing + READ_TEMPERATURE_X with UT_FAULT_LIMIT if + TEMP_UT_FAULT status is set. +tempX_crit_alarm Chip temperature critical high alarm. Set by comparing + READ_TEMPERATURE_X with OT_FAULT_LIMIT if + TEMP_OT_FAULT status is set. +tempX_rated_min Minimum rated temperature. + From MFR_TAMBIENT_MIN register. +tempX_rated_max Maximum rated temperature. + From MFR_TAMBIENT_MAX, MFR_MAX_TEMP_1, MFR_MAX_TEMP_2 or + MFR_MAX_TEMP_3 register. +======================= ======================================================== |