| # SPDX-License-Identifier: CC-BY-SA-4.0 |
| # SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com> |
| |
| TODO list for libgpiod |
| |
| ========== |
| |
| This document contains the list of things I'd like to have in libgpiod before |
| declaring it "mostly feature-complete". If anyone wants to help, this can |
| serve as the starting point. |
| |
| ========== |
| |
| * implement dbus API for controlling GPIOs |
| |
| A common complaint from users about gpioset is that the state of a line is not |
| retained once the program exits. While this is precisely the way linux |
| character devices work, it's understandable that most users will want some |
| centralized way of controlling GPIOs - similar to how sysfs worked. |
| |
| One of the possible solutions is a DBus API. We need a daemon exposing chips |
| and lines as dbus objects and allowing to control and inspect lines using |
| dbus methods and monitor them using signals. |
| |
| As of writing of this document some of the work has already been done and the |
| skeleton of the dbus daemon written in C using GLib has already been developed |
| and is partially functional. |
| |
| ---------- |
| |
| * implement a simple daemon for controlling GPIOs in C together with a client |
| program |
| |
| This is by far the lowest priority task. Similarly as with the dbus daemon: |
| the goal is to provide a centralized agent controlling GPIOs with a simple |
| interface consisting of a command line client communicating with the server |
| over unix sockets. |
| |
| In this case however the goal is to have as few dependencies as possible. This |
| is because for some small systems dbus is overkill. Since we won't be using any |
| standardized protocol, it will take much more effort to implement it correctly. |
| |
| ---------- |
| |
| * improve gpioset --interactive tab completion |
| |
| The existing tab completion uses libedit's readline emulation layer which |
| has a few limitations, including not being able to correctly handle quoted |
| line names and being disabled when stdin/stdout are not a tty (which makes |
| testing with gpio-tools-test.bats using coproc problematic). |
| |
| One approach that could address both these problems is to bypass the readline |
| emulation and use the libedit API (histedit.h) directly. |
