linux-kernel - Re: [PATCH 0/8] [Resend] ideapad: using EC command to control rf/camera power

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Date:	Wed, 18 Aug 2010 11:35:19 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Ike Panhc <ike.pan@...onical.com>
Cc:	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Thomas Renninger <trenn@...e.de>,
	Alan Cox <alan@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Corentin Chary <corentincj@...aif.net>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	"Brown, Len" <len.brown@...el.com>,
	Matthew Garrett <mjg@...hat.com>
Subject: Re: [PATCH 0/8] [Resend] ideapad: using EC command to control
 rf/camera power

On Wed, 2010-08-18 at 09:36 +0100, Ike Panhc wrote:
> 
> Once the rfkill of a laptop is set to block, it is no way to unblock with Linux
> without driver. Thanks for David Woodhouse wrote the first driver solving this.
> 
> But the \_SB_.GECN and \_SB_.DECN are only available on Lenovo ideapad S10-3.
> Using EC command to control rf/camera power is better because I believe every
> ideapads which has VPC2004 device in its DSDT has this common method.
> 
> This driver is tested and work fine on Lenovo ideapad B550 and ideapad S10-3.

Works for me too (on S10-3); thanks.

It all looks good, although should we have a delay or a schedule or at
least a cpu_relax() in the read_ec_data() and write_ec_cmd() loops?
Those loops should be using time_before() too, rather than open-coding
the comparison.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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