Messages in this thread |  | | Subject | Re: [PATCH v2] iio: accel: bmc150: Check for a second ACPI device for BOSC0200 | From | Steven Presser <> | Date | Sun, 4 Feb 2018 12:58:11 -0500 |
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All,
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.
Steve
[1] 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> wrote: >> 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 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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