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SubjectRe: [PATCH v2] iio: accel: bmc150: Check for a second ACPI device for BOSC0200

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

However, I did recover an exact chip ID - the chips in use are BMA255s
[1].  Rather than take the machine apart (and because the chips are
2mmx2mm), I queried the chip over SMBus.  On page 50 of the below
document, you can see that register 0x00 is a read-only chip ID.  This
chipID is unique per Bosch product.  So, using SMBus, I asked the chip
for it's chip ID (0xFA, in this case) and then searched likely products
until I found the matching chipID.

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

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



On 01/30/2018 03:12 PM, Andy Shevchenko wrote:
> On Tue, Jan 30, 2018 at 9:27 PM, Steven Presser <> wrote:
>> On 01/30/2018 02:05 PM, Andy Shevchenko wrote:
>>> On Tue, Jan 30, 2018 at 8:34 PM, Steven Presser <>
>>> 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 bma250[1],
>>>> which does not have a magnetometer component. I'm unfortunately away
>>>> from
>>>> my notes, but I can check later if you need me to verify the exact chip.
>>> Please do, I would really be on the safe side here.
>> Will do. My digital notes indicate I worked from what was exposed back to
>> what chip matched. If you can give me through Friday evening, I'll crack 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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