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gerrit.openbmc.org / openbmc / phosphor-gpio-monitor / 0172969c58370a0f4f41d646dce76c23dd0637cd
commit0172969c58370a0f4f41d646dce76c23dd0637cd[log] [tgz]
authorPatrick Williams <patrick@stwcx.xyz>Thu Jun 01 09:11:32 2023 -0500
committerPatrick Williams <patrick@stwcx.xyz>Thu Jun 01 16:07:40 2023 -0500
tree6fe098c1c4e7138c2659a5ff470fd9f088acdad9
parent162bd7104c58f0e9672511a183448fda4c920fab [diff]
meson: add subproject support

Enable building the repository outside of an OpenBMC Docker container or
SDK by leveraging meson subproject support.  Copy wrap files from
elsewhere in the organization and update the meson dependencies for some
missing dependencies.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9f2cdc310cbee3fd4ee911cca5e339c4e1ebb94f
9 files changed
tree: 6fe098c1c4e7138c2659a5ff470fd9f088acdad9
  1. gpio-util/
  2. presence/
  3. subprojects/
  4. test/
  5. .clang-format
  6. .gitignore
  7. 99-gpio-keys.rules
  8. argument.cpp
  9. argument.hpp
  10. evdev.cpp
  11. evdev.hpp
  12. file.hpp
  13. gpioMon.cpp
  14. gpioMon.hpp
  15. gpioMonMain.cpp
  16. LICENSE
  17. mainapp.cpp
  18. meson.build
  19. meson_options.txt
  20. monitor.cpp
  21. monitor.hpp
  22. OWNERS
  23. phosphor-gpio-monitor@.service
  24. phosphor-gpio-presence@.service
  25. phosphor-multi-gpio-monitor.json
  26. phosphor-multi-gpio-monitor.service
  27. README.md
README.md

GPIO Monitoring

Implemented Daemons

phosphor-gpio-monitor

This daemon accepts a command line parameter for monitoring single gpio line and take action if requested. This implementation uses GPIO keys and only supports monitoring single GPIO line, for multiple lines, user has to run this daemon seperately for each gpio line.

phosphor-multi-gpio-monitor

This daemon accepts command line parameter as a well-defined GPIO configuration file in json format to monitor list of gpios from config file and take action defined in config based on gpio state change. It uses libgpiod library.

Difference

New implementation (phosphor-multi-gpio-monitor) provides multiple gpio line monitoring in single instance of phosphor-multi-gpio-monitor running. It is very easy to add list of gpios into JSON config file and it also supports of GPIO line by name defined in kernel.

Configuration

There is a phosphor-multi-gpio-monitor.json file that defines details of GPIOs which is required to be monitored. This file can be replaced with a platform specific configuration file via bbappend.

Following are fields in json file

  1. Name: Name of gpio for reference.
  2. LineName: this is the line name defined in device tree for specific gpio
  3. GpioNum: GPIO offset, this field is optional if LineName is defined.
  4. ChipId: This is device name either offset ("0") or complete gpio device ("gpiochip0"). This field is not required if LineName is defined.
  5. EventMon: Event of gpio to be monitored. This can be "FALLING", "RISING" OR "BOTH". Default value for this is "BOTH".
  6. Target: This is an optional systemd service which will get started after triggering event. A journal entry will be added for every event occurs irrespective of this definition.
  7. Targets: This is an optional systemd service which will get started after triggering corresponding event(RASING or FALLING). A journal entry will be added for every event occurs irrespective of this definition.
  8. Continue: This is a optional flag and if it is defined as true then this gpio will be monitored continously. If not defined then monitoring of this gpio will stop after first event.

Sample config file

[
  {
    "Name": "PowerButton",
    "LineName": "POWER_BUTTON",
    "GpioNum": 34,
    "ChipId": "gpiochip0",
    "EventMon": "FALLING",
    "Target": "PowerButtonDown.service",
    "Continue": true
  },
  {
    "Name": "PowerGood",
    "LineName": "PS_PWROK",
    "EventMon": "BOTH",
    "Targets": {
      "FALLING": ["PowerGoodFalling.service", "PowerOff.service"],
      "RISING": ["PowerGoodRising.service", "PowerOn.service"]
    },
    "Continue": false
  },
  { "Name": "SystemReset", "GpioNum": 46, "ChipId": "0" }
]