comedi_legacy_detach(9)

okay bestie, welcome to comedi_legacy_detach(9) from the Kernel API Manual — this page is about the generic detach helper for legacy COMEDI drivers, and it’s lowkey iconic 💖✨

💖 NAME 💖

comedi_legacy_detach — the generic (*detach) function for legacy drivers. That’s the whole vibe: one tidy detach handler, no drama 🎀

✨ SYNOPSIS ✨

void comedi_legacy_detach (struct comedi_device *dev );

🎀 ARGUMENTS 🎀

• dev — the COMEDI device, bestie. Yes, literally just the COMEDI device 🫶

🦋 DESCRIPTION 🦋

okay so this is a simple, generic 'detach' handler for legacy COMEDI devices. We’re talking devices that just use a single I/O port region and possibly an IRQ, and that don’t need any special clean-up for their private device or subdevice storage. It’s giving “minimal cleanup, maximum slay” 😌

It can also be called by a driver-specific 'detach' handler — so yes, it’s allowed to be the cleanup bestie for another handler too 💅

Here’s the actual cleanup tea:

• If dev->irq is non-zero, the IRQ will be freed. No leftover IRQ, periodt 🔥
• If dev->iobase and dev->iolen are both non-zero, the I/O port region will be released. Both need to be non-zero, bestie — both, not one 🌸

🌸 SEE ALSO 🌸

The kernel file is ./drivers/comedi/drivers.c — and here’s the whole friend group:

• comedi_set_hw_dev(9)
• comedi_alloc_devpriv(9)
• comedi_alloc_subdevices(9)
• comedi_alloc_subdev_readback(9)
• comedi_readback_insn_read(9)
• comedi_timeout(9)
• comedi_dio_insn_config(9)
• comedi_dio_update_state(9)
• comedi_bytes_per_scan_cmd(9)
• comedi_bytes_per_scan(9)
• comedi_nscans_left(9)
• comedi_nsamples_left(9)
• comedi_inc_scan_progress(9)
• comedi_handle_events(9)
• comedi_load_firmware(9)
• __comedi_check_request_region(9)
• comedi_check_request_region(9)
• comedi_auto_config(9)
• comedi_auto_unconfig(9)
• comedi_driver_register(9)
• comedi_driver_unregister(9)

okay that’s the page, bestie. Signed off from source/version ./drivers/comedi — Kernel API Manual — date October 2026. Stay detach-ed and iconic 💅✨🫶