linux-kernel - Re: Accelerometer lis3lv02d is present on SMBus but its address is unknown, skipping registration

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Message-ID: <47ed190e-ebae-fdc6-f46a-f42a36fb6f26@molgen.mpg.de>
Date:   Tue, 28 Feb 2023 11:39:20 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Wolfram Sang <wsa@...nel.org>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-i2c@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, Dell.Client.Kernel@...l.com,
        Pali Rohár <pali@...nel.org>
Subject: Re: Accelerometer lis3lv02d is present on SMBus but its address is
 unknown, skipping registration

Dear Wolfram,


Thank you for your prompt reply.

Am 27.02.23 um 20:27 schrieb Wolfram Sang:

>> What can a user do about this? It looks like the I2C addresses need to be
>> added to `dell_lis3lv02d_devices[]` in `drivers/i2c/busses/i2c-i801.c`.
> 
> Complain to Dell about the missing address ;)

I will. (As “Laptop system certified with Ubuntu“ [1], I was hoping that 
Canonical would have solved that with Dell already.)

> Until then:
> 
>> [   20.631866] i801_smbus 0000:00:1f.4: SPD Write Disable is set
> 
> # cd /sys/bus/pci/drivers/i801_smbus/0000\:00\:1f.4
> # ls -d i2c-?
> 
> The last digit of the printout is the bus number. Then:
> 
> # modprobe i2c-dev
> # i2cdetect <bus_number>
> 
> And post the output here.

     $ cd /sys/bus/pci/drivers/i801_smbus/0000:00:1f.4
     $ ls -d i2c-?
     i2c-6
     $ sudo i2cdetect 6
     WARNING! This program can confuse your I2C bus, cause data loss and 
worse!
     I will probe file /dev/i2c-6.
     I will probe address range 0x08-0x77.
     Continue? [Y/n] Y
          0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
     00:                         08 -- -- -- -- -- -- --
     10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
     20: -- -- -- -- -- -- -- -- -- 29 -- -- -- -- -- --
     30: 30 -- -- -- -- 35 UU UU -- -- -- -- -- -- -- --
     40: -- -- -- -- 44 -- -- -- -- -- -- -- -- -- -- --
     50: UU -- 52 -- -- -- -- -- -- -- -- -- -- -- -- --
     60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
     70: -- -- -- -- -- -- -- --

> If you are brave and see that the address 0x1d or 0x29 are printed in
> your output, you could try adding an entry to the array you already
> mentioned above with the address you found. It may be safer to do
> some sanity checking before, though.

So, 29 shows up in the dump. Let’s see if I am going to find the time to 
build a Linux kernel. (I couldn’t find a module parameter to force 
loading at a specific address.)


Kind regards,

Paul


[1]: https://ubuntu.com/certified/201902-26859