linux-kernel - Re: [PATCH 2/3] mfd: cros_ec: Create sysfs attributes for the ChromeOS EC.

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Message-ID: <546F8711.70503@collabora.co.uk>
Date:	Fri, 21 Nov 2014 19:40:17 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Bill Richardson <wfrichar@...omium.org>
CC:	Lee Jones <lee.jones@...aro.org>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>, Simon Glass <sjg@...gle.com>,
	Gwendal Grignou <gwendal@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mfd: cros_ec: Create sysfs attributes for the ChromeOS
 EC.

Hello Bill,

On 11/20/2014 07:16 PM, Bill Richardson wrote:
>>
>> I don't really know why there are two interfaces for this but I guess
>> that different user-space utilities use one or another. Maybe the
>> ChromiumOS folks can comment on this.
> 
> The /dev/cros_ec interface responds to ioctls and is the primary means
> by which userspace applications talk to the EC (replacing three really
> awkward bus-specific libraries). It emits a simplified version string
> when read so that humans can tell if the EC is alive and speaking the
> same protocol that the userspace app expects.
> 
> The /sys/class/chromeos/cros_ec/* tree was originally envisioned as a
> way to provide additional human-readable interfaces to a subset of the
> EC commands, but except for the lightbar it's not often used. The
> version component here shows all the version-related info that the EC
> can provide.
> 

Got it, thanks a lot for the explanation.

Best regards,
Javier


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