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Message-ID: <20141124215026.GA14361@srcf.ucam.org> Date: Mon, 24 Nov 2014 21:50:26 +0000 From: Matthew Garrett <mjg59@...f.ucam.org> To: Pali Rohár <pali.rohar@...il.com> Cc: Darren Hart <dvhart@...radead.org>, platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org, Gabriele Mazzotta <gabriele.mzt@...il.com>, Alex Hung <alex.hung@...onical.com> Subject: Re: [PATCH 1/3] platform: x86: dell-rbtn: Dell Airplane Mode Switch driver On Mon, Nov 24, 2014 at 09:55:47PM +0100, Pali Rohár wrote: > This is complicated. HW switch controls all radio devices and you > do not know which are present in specified running machine. Also > list of devices which HW switch controls can be edited in BIOS > (on some machines). So what to do? We only know that it controls > some devices... Typically there'll be a firmware method that provides a mask of the controlled devices. Do you have the ACPI tables for a device that implements this? Registering an rfkill interface that claims to only control wifi but which also kills other devices is likely to confuse userspace - it would probably be better to avoid registering the rfkill interface at all in that case. -- Matthew Garrett | mjg59@...f.ucam.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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