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gerrit.openbmc.org / openbmc / phosphor-gpio-monitor / 9e8a2ffe85ae936271d482b1963049c5d148d77a
commit9e8a2ffe85ae936271d482b1963049c5d148d77a[log] [tgz]
authorGeorge Liu <liuxiwei@inspur.com>Mon Aug 07 08:31:15 2023 +0800
committerGeorge Liu <liuxiwei@inspur.com>Mon Aug 07 08:31:15 2023 +0800
tree7218e5801799ed9d2df2241156da34d7d4940ee6
parent7d7cc9e69bd36fdc5d55838dad233aba768e2a09 [diff]
Remove gpio-util

The gpio-util directory is not widely used in the community, and its
only known usage[1] has been removed, and so we agreed with the
maintainer to delete this directory.

[1] https://gerrit.openbmc.org/c/openbmc/openbmc/+/65642

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I61294b6a456e95532414687427b0c1cf36d58b4a
7 files changed
tree: 7218e5801799ed9d2df2241156da34d7d4940ee6
  1. presence/
  2. subprojects/
  3. test/
  4. .clang-format
  5. .gitignore
  6. 99-gpio-keys.rules
  7. evdev.cpp
  8. evdev.hpp
  9. file.hpp
  10. gpioMon.cpp
  11. gpioMon.hpp
  12. gpioMonMain.cpp
  13. LICENSE
  14. mainapp.cpp
  15. meson.build
  16. meson_options.txt
  17. monitor.cpp
  18. monitor.hpp
  19. OWNERS
  20. phosphor-gpio-monitor@.service
  21. phosphor-gpio-presence@.service
  22. phosphor-multi-gpio-monitor.json
  23. phosphor-multi-gpio-monitor.service
  24. 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" }
]