linux-kernel - Re: [PATCH] sbs-battery: make writes to ManufacturerAccess optional

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Message-ID: <20160919190242.wx2enmdqblbcvzqm@earth>
Date:   Mon, 19 Sep 2016 21:02:45 +0200
From:   Sebastian Reichel <sre@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>
Subject: Re: [PATCH] sbs-battery: make writes to ManufacturerAccess optional

Hi,

On Thu, Sep 08, 2016 at 07:10:00PM -0700, Guenter Roeck wrote:
> According to the Smart Battery Data Specification, the use
> of ManufacturerAcess (register 0x0) is implementation-defined.
> It appears that some batteries use writes to this register
> in order to implement certain functionality, but others may
> simply NAK all writes to it. As a result, write failures to
> ManufacturerAccess should not be used as an indicator of
> battery presence, nor as a failure to enter sleep mode.
> 
> The failed write access was seen with SANYO AP13J3K.
> 
> Cc: Brian Norris <briannorris@...omium.org>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

Thanks, queued.

-- Sebastian

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