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gerrit.openbmc.org / openbmc / phosphor-power / 92e89eb5bd184c6bdd569a2bc905bce12cad488e
commit92e89eb5bd184c6bdd569a2bc905bce12cad488e[log] [tgz]
authorLei YU <mine260309@gmail.com>Wed Nov 06 18:08:25 2019 +0800
committerLei YU <mine260309@gmail.com>Mon Dec 09 14:14:41 2019 +0800
tree5f35ba6c7e2f4eac0d63cbba1d20984e43aab7c4
parent7c2fbbb61ca9bbfecea2278d0368c4e02038db3d [diff]
i2c: Implement read function

Implement I2CDevice::read() by invoking i2c_smbus_read_xxx() APIs.
The code is referenced from i2c-tools' i2cget.c:

 https://github.com/ev3dev/i2c-tools/blob/ev3dev-stretch/tools/i2cget.c

Tested: Verify on Witherspoon that it reads the PSU ppgrade mode status
        register (1 byte) and CRC16 register (2 bytes) correctly.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I8759b6a35229f81120acf77f08429f7f79458b8b
6 files changed
tree: 5f35ba6c7e2f4eac0d63cbba1d20984e43aab7c4
  1. example/
  2. org/
  3. phosphor-regulators/
  4. power-sequencer/
  5. power-supply/
  6. services/
  7. test/
  8. tools/
  9. .clang-format
  10. .gitignore
  11. argument.hpp
  12. device.hpp
  13. device_monitor.hpp
  14. elog-errors.hpp
  15. file.hpp
  16. gpio.cpp
  17. gpio.hpp
  18. LICENSE
  19. MAINTAINERS
  20. meson.build
  21. meson_options.txt
  22. names_values.hpp
  23. pmbus.cpp
  24. pmbus.hpp
  25. README.md
  26. types.hpp
  27. utility.cpp
  28. utility.hpp
README.md

Code for detecting and analyzing power faults on Witherspoon.

To Build

To build this package, do the following steps:

    1. meson build
    2. ninja -C build

To clean the repository again run `rm -rf build`.

Power Supply Monitor and Util JSON config

Several applications in this repository require a PSU JSON config to run. The JSON config file provides information for:

  • Where to access the pmbus attributes
  • Which attribute file in pmbus maps to which property and interface in D-Bus
  • Which kernel device directory is used on which PSU

There is an example psu.json to describe the necessary configurations.

  • inventoryPMBusAccessType defines the pmbus access type, which tells the service which sysfs type to use to read the attributes. The possible values are:
    • Base: The base dir, e.g. /sys/bus/i2c/devices/3-0069/
    • Hwmon: The hwmon dir, e.g. /sys/bus/i2c/devices/3-0069/hwmon/hwmonX/
    • Debug: The pmbus debug dir, e.g. /sys/kernel/debug/pmbus/hwmonX/
    • DeviceDebug: The device debug dir, e.g. '/sys/kernel/debug/./`
    • HwmonDeviceDebug: The hwmon device debug dir, e.g. /sys/kernel/debug/pmbus/hwmonX/cffps1/
  • fruConfigs defines the mapping between the attribute file and the FRU inventory interface and property. The configuration example below indicates that the service will read part_number attribute file from a directory specified by the above pmbus access type, and assign to PartNumber property in xyz.openbmc_project.Inventory.Decorator.Asset interface.
      "fruConfigs": [
    {
      "propertyName": "PartNumber",
      "fileName": "part_number",
      "interface": "xyz.openbmc_project.Inventory.Decorator.Asset"
    }
  ]
  • psuDevices defines the kernel device dir for each PSU in inventory. The configuration example below indicates that powersupply0's device is located in /sys/bus/i2c/devices/3-0069.
      "psuDevices": {
    "/xyz/openbmc_project/inventory/system/chassis/motherboard/powersupply0" : "/sys/bus/i2c/devices/3-0069",
  }