linux-kernel - Re: [PATCH v2 2/4] toshiba_acpi: Support alternate hotkey interfaces

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Message-ID: <20120105182522.GD24242@srcf.ucam.org>
Date:	Thu, 5 Jan 2012 18:25:22 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Seth Forshee <seth.forshee@...onical.com>
Cc:	Len Brown <lenb@...nel.org>, Azael Avalos <coproscefalo@...il.com>,
	Thomas Renninger <trenn@...e.de>,
	platform-driver-x86@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] toshiba_acpi: Support alternate hotkey
 interfaces

On Tue, Jan 03, 2012 at 01:02:36PM -0600, Seth Forshee wrote:
> There are two types of problems that prevent hotkeys from working
> on many of the machines supported by toshiba_acpi. The first of
> these is the lack of a functioning SCI for hotkey events. For these
> machines it is possible to filter the Fn keypresses from the
> keyboard and generate a notification by executing the ACPI NTFY
> method.
> 
> The second problem is a lack of support for HCI_SYSTEM_EVENT, which
> is used for reading the hotkey scancodes. On these machines the
> scancodes can be read by executing the ACPI NTFY method.
> 
> This patch fixes both problems by installing an i8042 filter when
> the NTFY method is present to generate notifications and by
> detecting which of INFO or HCI_SYSTEM_EVENT is supported for
> reading scancodes. If neither method of reading scancodes is
> supported, the hotkey input device is not registered.
> 
> Signed-off-by: Azael Avalos <coproscefalo@...il.com>
> Signed-off-by: Seth Forshee <seth.forshee@...onical.com>

It's still an awful way to implement things, but it doesn't seem like 
there's any alternative, so sure.

> +		error = i8042_install_filter(toshiba_acpi_i8042_filter);

If this is only needed for TOS1900 machines then I think I'd prefer to 
see it only done on them. Just add a flag to the data field of the IDs 
and check that.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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