eeprom.md

eeprom

Description

Some fans have EEPROMs on them. In these cases, the eeprom JSON stanza can be used to have the application re-bind the EEPROM driver to the EEPROM instance after a new fan is detected. This will trigger the EEPROM to be read by the appropriate code if the platform is configured to do so.

This is optional and only required if the above behavior is desired.

Keys

• "bus_address"
• "driver_name"
• "bind_delay_ms"

"bus_address"

The I2C bus and address string of the form BB-AAAA that is used by the I2C subsystem in sysfs.

"bus_address": "3-0050"

"driver_name"

The name of the eeprom driver in sysfs.

"driver_name": "at24"

"bind_delay_ms"

The number of milliseconds to wait after a fan is detected before binding the driver to the device in case the device takes some time to initialize after being plugged into power. If no delay is required, a value of zero can be used.

"bind_delay_ms": 1000

Example

[
  {
    "name": "fan0",
    "path": "/system/chassis/motherboard/fan0",
    "methods": [
      {
        "type": "tach",
        "sensors": ["fan0_0"]
      }
    ],
    "rpolicy": {
      "type": "anyof"
    },
    "eeprom": {
      "bus_address": "30-0050",
      "driver_name": "at24",
      "bind_delay_ms": 1000
    }
  }
]