docs/designs/gpio-based-cable-presence.md

1 ## GPIO-based Cable Presence Detection
9 The intent of this new daemon design is to report GPIO-based cable presence
13 huge waste. Therefore, we need a solution to pack multiple presence states into
23 1. The openbmc IPMI interface should support exposing cable presence states.
30 Presence states. This new daemon will resIDe in openbmc/dbus-sensors. Its
63 polls the gpio presence signal for these objects in an interval of 10 seconds.
69 On the IPMI sIDe, the presence states will be grouped into fewer SDR IDs in
86 new SDR name is cable[0-1]. The SDR name implies that this SDR has the presence
88 bit position for cable1 is 1. In the case of having more than 14 presence
106 try to group it with anything and use 1 SDR ID for its presence state. See the
131 - Explore the option of reporting the presence state via type12 record instead
133   of 255 IDs. Meanwhile, it doesn't support stacking multiple presence states in
159 - The presence state that is reported by GpioCableSevice is matching the result
163   the zeroth bit is matching the presence state of object
169   group. Meanwhile, only the zero bit is used to report the presence state.
171 - The state of the cable presence need to change with 10 seconds once a cable is