Add gpio-presence-sensor
This is to implement the gpio based hw inventory design [1].
There is a new meson option 'gpio-presence' to enable/disable the
daemon.
Summary of the functionality:
- fetch configuration from EM, according to the configuration interface
- the D-Bus interface is
xyz.openbmc_project.Configuration.GPIODeviceDetect
- the configuration represents devices for which presence can be
detected based on gpio values.
- watch gpios for changes
- add/remove the xyz.openbmc_project.Inventory.Source.DevicePresence
interface on the object path based on gpio values.
References:
[1] https://github.com/openbmc/docs/blob/master/designs/inventory/gpio-based-hardware-inventory.md
[2] https://www.kernel.org/doc/html/latest/admin-guide/gpio/gpio-sim.html
Tested: using linux gpio-sim facility, see below
1. create a fake gpio via [2]
2. configure gpio-presence-sensor as per [1]
3. run the gpio-presence-sensor
4. change the value of the gpio previously configured
5. there should be log output (at debug level)
6. the dbus interfaces exposed should appear/disappear as per [1]
Change-Id: I4cf039b583247581aa5c6c6c59e7fc41ced0bb85
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/service_files/xyz.openbmc_project.gpiopresence.service b/service_files/xyz.openbmc_project.gpiopresence.service
new file mode 100644
index 0000000..0f0b2ce
--- /dev/null
+++ b/service_files/xyz.openbmc_project.gpiopresence.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=GPIO Presence Sensor
+
+[Service]
+ExecStart=/usr/libexec/entity-manager/gpio-presence-sensor
+Restart=always
+Type=dbus
+BusName=xyz.openbmc_project.gpiopresence
+
+[Install]
+WantedBy=multi-user.target
+Alias=dbus-xyz.openbmc_project.gpiopresence.service