Implement OpenDRM: Linux DRM/KMS abstraction library and CLI

[Copilot]

Bootstraps the opendrm repository with a generic Linux DRM/KMS abstraction layer targeting OpenIPC embedded devices (cameras, FPV ground stations) that need direct display output without a compositor.

Library (src/opendrm.h / src/opendrm.c)

• Device management — drm_open / drm_close with capability negotiation (UNIVERSAL_PLANES, ATOMIC, DUMB_BUFFER)
• Output setup — drm_prepare enumerates connectors, selects the best matching mode (or preferred if unspecified), allocates a double-buffered ARGB8888 dumb framebuffer pipeline
• Atomic commits — drm_commit issues test-then-apply DRM_MODE_ATOMIC_ALLOW_MODESET commits for tear-free updates
• Clean teardown — drm_cleanup correctly unwinds map → FB → dumb buffer in order; partial allocation paths are safe

Header named opendrm.h (not drm.h) to avoid collision with the system libdrm <drm.h>.

CLI (src/main.c)

opendrm [options] <command>

Commands:
  list        Print WxH@R for every connected display
  info        Dump connector / CRTC / plane topology

Options:
  -d <device>  DRM node (default: /dev/dri/card0)

Command is validated before the device is opened so unknown-command errors are clear.

Build (CMakeLists.txt)

CMake (≥ 3.10, C99) with pkg-config libdrm. Produces:

• opendrm — CLI binary
• libopendrm_lib.a — static library for downstream projects
• src/opendrm.h installed to <prefix>/include/opendrm/

Original prompt

OpenDRM

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