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Subject: Re: [PATCH v2] iio: accel: bmc150: Check for a second ACPI device for
 BOSC0200
To:     Andy Shevchenko <andy.shevchenko@gmail.com>
Cc:     Hans de Goede <hdegoede@redhat.com>,
        Hartmut Knaack <knaack.h@gmx.de>,
        Jeremy Cline <jeremy@jcline.org>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Jonathan Cameron <jic23@jic23.retrosnub.co.uk>,
        Lars Kellogg-Stedman <lars@oddbit.com>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        Wolfram Sang <wsa@the-dreams.de>, linux-iio@vger.kernel.org
References: <010001602cf53153-39ad69f1-1b39-4e6d-a748-9455a16c2fbd-000000@email.amazonses.com>
 <20171210182152.70ad8fbf@archlinux>
 <01000160dccefcb4-25edfd89-56f3-486f-88a4-cb8c07253974-000000@email.amazonses.com>
 <20180114104330.2aa7c1fd@archlinux> <20180128094021.572ab366@archlinux>
 <CAHp75VenBEYSZ9okZfGZUmBX+ikL236a9_qjtn-DJtSihw5X+g@mail.gmail.com>
 <20180130160107.000006df@huawei.com>
 <CAHp75VchRJzp1CM33q18e9x8Uq7bNrPZykz-GdpRgB3=y2C+KQ@mail.gmail.com>
 <CAHp75Vf==OQ=Cx4Nzrd+vAOJshT-oL6L8Y54aWt0cGyJJuacjg@mail.gmail.com>
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 <f42f6acc-cb30-e36d-0c98-42b7e3d40457@pressers.name>
 <CAHp75VfmH5aNPzBLvm-GrQ-49uyJNNwdjbte3uh_kmaC91bz6A@mail.gmail.com>
 <197f448e-322f-dae4-aa4b-3cc2bd5b16bb@pressers.name>
 <CAHp75VeVuS51Z7U2P+t3YnfitUtVVAa_8oSbnXCHTY7rqrJUEQ@mail.gmail.com>
From:   Steven Presser <steve@pressers.name>
Message-ID: <9ee7da52-d86a-7784-8c00-6e5b4ae3ed96@pressers.name>
Date:   Sun, 4 Feb 2018 12:58:11 -0500
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Content-Type: text/plain; charset=utf-8; format=flowed
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Content-Language: en-US

All,

I had a chance to sit back down with the machine.=C2=A0 I didn't take it =
all=20
the way apart - there are pieces that I'm afraid of breaking without=20
directions on how to properly disassemble them.

However, I did recover an exact chip ID - the chips in use are BMA255s=20
[1].=C2=A0 Rather than take the machine apart (and because the chips are =

2mmx2mm), I queried the chip over SMBus.=C2=A0 On page 50 of the below=20
document, you can see that register 0x00 is a read-only chip ID.=C2=A0 Th=
is=20
chipID is unique per Bosch product.=C2=A0 So, using SMBus, I asked the ch=
ip=20
for it's chip ID (0xFA, in this case) and then searched likely products=20
until I found the matching chipID.

Does this suffice to settle which chips are in use?=C2=A0 If not, I can=20
finish taking the machine apart, I'd just prefer to avoid the risk of=20
breaking something.

As soon as I finish screwing everything back together, I'll grab the=20
other software IDs asked for and build the branch referenced elsewhere.

Steve


[1]=20
https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMA255=
-DS004-05_published.pdf


On 01/30/2018 03:12 PM, Andy Shevchenko wrote:
> On Tue, Jan 30, 2018 at 9:27 PM, Steven Presser <steve@pressers.name> w=
rote:
>> On 01/30/2018 02:05 PM, Andy Shevchenko wrote:
>>> On Tue, Jan 30, 2018 at 8:34 PM, Steven Presser <steve@pressers.name>=

>>> wrote:
>>>> First, I believe the "bmc150" in the subject line is in some way a
>>>> misnomer.
>>>> You'd have to ask Jeremy for more details on what he intended it to =
refer
>>>> to.  However, I believe the device in question is actually the bma25=
0[1],
>>>> which does not have a magnetometer component.  I'm unfortunately awa=
y
>>>> from
>>>> my notes, but I can check later if you need me to verify the exact c=
hip.
>>> Please do, I would really be on the safe side here.
>> Will do.  My digital notes indicate I worked from what was exposed bac=
k to
>> what chip matched.  If you can give me through Friday evening, I'll cr=
ack it
>> and do a visual verification.  (Alas, I'm traveling and won't be back =
to it
>> until then).
> We are in the merge window anyway, so, no hurry.
>
> I'm looking right now in the clean solution. Looks promising.
>
>>> Bad, bad Lenovo. (DMI strings might help here)
>> What particular DMI strings would be helpful?  All of them?
> Let's do this way. Create a bug on kernel bugzilla, attach output of
>
> % acpidump -o tables.dat # tables.dat file
> % grep -H 15 /sys/bus/acpi/devices/*/status
> % dmidecode
>
> and share the number here. I will take it.
>


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