Message-ID: <20230201102954.00002abb@Huawei.com>
Date:   Wed, 1 Feb 2023 10:29:54 +0000
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Darrell Kavanagh <darrell.kavanagh@...il.com>
CC:     Jonathan Cameron <jic23@...nel.org>, <linux-iio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Bastien Nocera <hadess@...ess.net>
Subject: Re: Bug#1029850: linux: Driver not loaded for ST Microelectronics
 LSM6DS3TR-C accelerometer (acpi:SMO8B30:SMO8B30:)

On Wed, 1 Feb 2023 01:46:11 +0000
Darrell Kavanagh <darrell.kavanagh@...il.com> wrote:

> I should also add that I'm more than willing to help in testing any
> further changes for you, whether for this bug or future ones.
> 

Thanks for the excellent reporting and testing!  I'll definitely
keep you in mind for this driver and in particular ACPI side
of things.

Jonathan

> Darrell
> 
> On Wed, 1 Feb 2023 at 01:40, Darrell Kavanagh
> <darrell.kavanagh@...il.com> wrote:
> >
> > Hello, all.
> >
> > I've finally reached a conclusion on this, after testing all the
> > combinations of the patches (with and without reading the acpi
> > mounting matrix), window managers (wayland, xorg) and the presence or
> > not of my custom kernel parms.
> >
> > What works well is the full set of patches with the custom kernel
> > parms and a new hwdb entry for the sensor:
> >
> > sensor:modalias:acpi:SMO8B30*:dmi:*:svnLENOVO*:pn82AT:*
> >  ACCEL_MOUNT_MATRIX=0, 1, 0; -1, 0, 0; 0, 0, 1
> >
> > The autorotate then works correctly in wayland and xorg, but for xorg,
> > the settings say the screen is "portrait left" when in actual fact it
> > is in standard laptop landscape orientation. Wayland does not have
> > this problem (I guess because wayland's view of the screen is straight
> > from the kernel).
> >
> > Without the hwdb entry, the orientation is 90 degrees out without
> > using the acpi matrix and 180 degrees out when using it. I could have
> > gone either way here with appropriate hwdb entries, but my view is
> > that we *should* be using the matrix.
> >
> > BTW, when I reported before that it was working correctly in Gnome, I
> > was using a third party shell extension to force auto-rotation rather
> > than actually detaching the keyboard. I take the view that if an
> > extension works differently to the built-in tablet mode, it's the
> > extension's problem!
> >
> > The only thing that concerns me is the need for custom kernel parms.
> > It would be better if there was a way to avoid this, so that the user
> > didn't have to mess around with their grub config. Though having said
> > that, the sensors fix as we have it doesn't make things worse - under
> > currently released kernels the screen always starts up sideways unless
> > custom parms are added in grub.
> >
> > Without the custom parms,  the patches and the new hwdb entry do
> > ensure that things end up the right way around, but it's a bit clunky.
> > The boot messages/splash is sideways and you can see the sensors
> > kicking in on the gdm screen: it shows momentarily sideways before
> > righting itself. This can also cause the scaling to be set to 200%,
> > which can carry through to the user's session.
> >
> > So thanks for your work on this - I now have a fully functioning
> > device. I hope the changes are robust enough to be pushed into a
> > future kernel so that others can benefit.
> >
> > Regards,
> > Darrell
> >
> >
> > On Tue, 31 Jan 2023 at 13:34, Darrell Kavanagh
> > <darrell.kavanagh@...il.com> wrote:  
> > >
> > > Just a quick update on testing: I'm finding what look like
> > > interactions between the kernel parm
> > > video=DSI-1:panel_orientation=right_side_up and the sensor, which also
> > > seem to differ depending on whether I'm in an X or Wayland session.
> > > I'm documenting the effects of the various combinations and will post
> > > my results when complete.
> > >
> > > Thanks,
> > > Darrell
> > >
> > >
> > >
> > >
> > >
> > > On Mon, 30 Jan 2023 at 20:17, Jonathan Cameron <jic23@...nel.org> wrote:  
> > > >
> > > > On Mon, 30 Jan 2023 20:02:31 +0000
> > > > Darrell Kavanagh <darrell.kavanagh@...il.com> wrote:
> > > >  
> > > > > Thanks. To be clear, before I changed the grub command line, the
> > > > > system always booted up "sideways", even when the sensor was not being
> > > > > detected. This was true for everything, not just Gnome, except grub
> > > > > itself.
> > > > >
> > > > > I added:
> > > > >
> > > > > GRUB_CMDLINE_LINUX_DEFAULT="fbcon=rotate:1
> > > > > video=DSI-1:panel_orientation=right_side_up quiet splash"
> > > > >
> > > > > This fixed the orientation for pre-splash boot messages, the splash
> > > > > screen and the desktop environment. But not, for example (as I saw
> > > > > after adding my own module signing key for testing your fixes), the
> > > > > MOK validation screens.
> > > > >
> > > > > Does this make sense?
> > > > >
> > > > > Does what you are proposing act at a lower level than changing the
> > > > > systemd hwdb orientation matrix?  
> > > >
> > > > I'm not sure on the userspace side of things, but intent is that
> > > > it will provide the orientation data to any users - though only after
> > > > the kernel boots and software needs to be aware of it.  Give it a go,
> > > > and if not Bastien (IIRC wrote iio-sensor-proxy) may be able to advise.
> > > >
> > > > For Bastien - patches for kernel side are:
> > > > https://lore.kernel.org/linux-iio/20230130201018.981024-1-jic23@kernel.org/T/#t
> > > >
> > > > Darrell is going to test them after back porting to 6.1.
> > > > With the first patch he gets the right result in gnome but we weren't
> > > > picking up the rotation matrix at that point (ROTM in ACPI).
> > > >
> > > > Thanks,
> > > >
> > > > Jonathan
> > > >  
> > > > >
> > > > > Thanks,
> > > > > Darrell
> > > > >
> > > > > On Mon, 30 Jan 2023 at 19:27, Jonathan Cameron <jic23@...nel.org> wrote:  
> > > > > >
> > > > > > On Mon, 30 Jan 2023 18:32:02 +0000
> > > > > > Darrell Kavanagh <darrell.kavanagh@...il.com> wrote:
> > > > > >  
> > > > > > > On Mon, 30 Jan 2023 at 17:35, Jonathan Cameron
> > > > > > > <Jonathan.Cameron@...wei.com> wrote:
> > > > > > >  
> > > > > > > > That certainly looks like suitable matrix.
> > > > > > > >
> > > > > > > > If we are lucky it matches the handling in bmc150-accel-core.c for an identically
> > > > > > > > named method.  That is going to swap the x and y axis which is I'd have thought would
> > > > > > > > be rather bad if what you have is currently working well.
> > > > > > > >  
> > > > > > >
> > > > > > > Actually, that would be good, because at present I have to rotate 90
> > > > > > > degrees in my grub command line.  
> > > > > > :)
> > > > > >
> > > > > > I'll see if I can roll a suitable patch.
> > > > > >
> > > > > > Jonathan
> > > > > >  
> > > > > > >
> > > > > > > Darrell
> > > > > > >  
> > > > > > > > >             }
> > > > > > > > >
> > > > > > > > >             Method (PRIM, 0, NotSerialized)
> > > > > > > > >             {
> > > > > > > > >                 Name (RBUF, Buffer (One)
> > > > > > > > >                 {
> > > > > > > > >                      0x01                                             // .
> > > > > > > > >                 })
> > > > > > > > >                 Return (RBUF) /* \_SB_.PCI0.I2C5.DEV_.PRIM.RBUF */
> > > > > > > > >             }
> > > > > > > > >
> > > > > > > > >             Method (_STA, 0, NotSerialized)  // _STA: Status
> > > > > > > > >             {
> > > > > > > > >                 If ((GAVT == 0x6A))
> > > > > > > > >                 {
> > > > > > > > >                     Return (0x0F)
> > > > > > > > >                 }
> > > > > > > > >                 Else
> > > > > > > > >                 {
> > > > > > > > >                     Return (Zero)
> > > > > > > > >                 }
> > > > > > > > >             }
> > > > > > > > >
> > > > > > > > >             Method (CALS, 1, NotSerialized)
> > > > > > > > >             {
> > > > > > > > >                 Local0 = Arg0
> > > > > > > > >                 If (((Local0 == Zero) || (Local0 == Ones)))
> > > > > > > > >                 {
> > > > > > > > >                     Local0 = BAC1 /* \BAC1 */
> > > > > > > > >                     Return (Local0)
> > > > > > > > >                 }
> > > > > > > > >                 Else
> > > > > > > > >                 {
> > > > > > > > >                     BAC1 = Local0
> > > > > > > > >                     BACS = Local0
> > > > > > > > >                     BSCA (0xB0)
> > > > > > > > >                 }
> > > > > > > > >             }
> > > > > > > > >         }
> > > > > > > > >     }
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > Thanks,
> > > > > > > > > Darrell
> > > > > > > > >
> > > > > > > > > On Mon, 30 Jan 2023 at 12:31, Jonathan Cameron
> > > > > > > > > <Jonathan.Cameron@...wei.com> wrote:  
> > > > > > > > > >
> > > > > > > > > > On Mon, 30 Jan 2023 03:37:23 +0000
> > > > > > > > > > Darrell Kavanagh <darrell.kavanagh@...il.com> wrote:
> > > > > > > > > >  
> > > > > > > > > > > Forwarding because original html messages were rejected by the server...
> > > > > > > > > > >
> > > > > > > > > > > ---------- Forwarded message ---------
> > > > > > > > > > > From: Darrell Kavanagh <darrell.kavanagh@...il.com>
> > > > > > > > > > > Date: Mon, 30 Jan 2023 at 02:52
> > > > > > > > > > > Subject: Re: Bug#1029850: linux: Driver not loaded for ST
> > > > > > > > > > > Microelectronics LSM6DS3TR-C accelerometer (acpi:SMO8B30:SMO8B30:)
> > > > > > > > > > > To: Jonathan Cameron <jic23@...nel.org>
> > > > > > > > > > > Cc: <lorenzo@...nel.org>, <lars@...afoo.de>,
> > > > > > > > > > > <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
> > > > > > > > > > > <carnil@...ian.org>
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > Hi Jonathan,
> > > > > > > > > > >
> > > > > > > > > > > Thank you. The driver has evolved quite a bit in 6.2 (I read somewhere
> > > > > > > > > > > that 6.2 includes some i2c enhancements), but I adapted your changes
> > > > > > > > > > > to fit my Debian 6.1 kernel and it works. Two IIO devices are created
> > > > > > > > > > > in sysfs, iio-sensor-proxy.service starts up and automatic screen
> > > > > > > > > > > rotation in Gnome just works.
> > > > > > > > > > >
> > > > > > > > > > > To get the modules to load on boot, I made a small change to your code
> > > > > > > > > > > in st_lsm6dsx_i2c to add the acpi alias to modules.alias:
> > > > > > > > > > >
> > > > > > > > > > > adding a null element to st_lsm6dsx_i2c_acpi_match:
> > > > > > > > > > >     static const struct acpi_device_id st_lsm6dsx_i2c_acpi_match[] = {
> > > > > > > > > > >          { "SMO8B30", ST_LSM6DS3TRC_ID, },
> > > > > > > > > > >          { },
> > > > > > > > > > >     };
> > > > > > > > > > > then:
> > > > > > > > > > >    MODULE_DEVICE_TABLE(acpi, st_lsm6dsx_i2c_acpi_match);  
> > > > > > > > > >
> > > > > > > > > > doh! That was indeed sloppy of me to miss even for an untested hack.
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >  
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > dmesg shows:
> > > > > > > > > > >
> > > > > > > > > > > [ 7366.120208] st_lsm6dsx_i2c i2c-SMO8B30:00: supply vdd not found,
> > > > > > > > > > > using dummy regulator
> > > > > > > > > > > [ 7366.120260] st_lsm6dsx_i2c i2c-SMO8B30:00: supply vddio not found,
> > > > > > > > > > > using dummy regulator
> > > > > > > > > > > [ 7366.650839] st_lsm6dsx_i2c i2c-SMO8B30:00: mounting matrix not
> > > > > > > > > > > found: using identity...
> > > > > > > > > > >
> > > > > > > > > > > Is this a problem?  
> > > > > > > > > >
> > > > > > > > > > Those are all fine. For regulators that's expected on ACPI and should
> > > > > > > > > > be harmless as it's up to the firmware to manage power (in DT it may
> > > > > > > > > > be up to the kernel).
> > > > > > > > > > For the mounting matrix, there is often something in ACPI DSDT
> > > > > > > > > > (non standard though).  Could you
> > > > > > > > > > cat /sys/firmware/acpi/tables/DSDT > ~/dsdt
> > > > > > > > > > then run through iasl from acpitools
> > > > > > > > > > iasl -d ~/dsdt
> > > > > > > > > > and find the bit related to this device.
> > > > > > > > > >
> > > > > > > > > > If you can then share that there may be a _DSM or similar in there that
> > > > > > > > > > is effectively the mounting matrix.  If we are lucky it will look like
> > > > > > > > > > some existing versions we have code to handle and can add that support
> > > > > > > > > > as well.
> > > > > > > > > >
> > > > > > > > > > Either way - I'll spin a formal patch with your fixes above and we can
> > > > > > > > > > get this upstream for future kernels.  Mounting matrix can follow
> > > > > > > > > > later if needed.
> > > > > > > > > >
> > > > > > > > > > Thanks,
> > > > > > > > > >
> > > > > > > > > > Jonathan
> > > > > > > > > >
> > > > > > > > > >  
> > > > > > > > > > >
> > > > > > > > > > > Thanks again.
> > > > > > > > > > >
> > > > > > > > > > > Darrell
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > On Sun, 29 Jan 2023 at 18:10, Jonathan Cameron <jic23@...nel.org> wrote:  
> > > > > > > > > > > >
> > > > > > > > > > > > On Sun, 29 Jan 2023 17:03:51 +0000
> > > > > > > > > > > > Darrell Kavanagh <darrell.kavanagh@...il.com> wrote:
> > > > > > > > > > > >  
> > > > > > > > > > > > > Hi,
> > > > > > > > > > > > >
> > > > > > > > > > > > > I raised this bug in Debian, and have been asked to raise it upstream and
> > > > > > > > > > > > > was given your addresses to do so. Will this email be OK, or should I raise
> > > > > > > > > > > > > it in a bug tracking system somewhere?  
> > > > > > > > > > > >
> > > > > > > > > > > > Email is the right option.
> > > > > > > > > > > >  
> > > > > > > > > > > > >
> > > > > > > > > > > > > Many thanks,
> > > > > > > > > > > > > Darrell
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > ---------- Forwarded message ---------
> > > > > > > > > > > > > From: Salvatore Bonaccorso <carnil@...ian.org>
> > > > > > > > > > > > > Date: Sat, 28 Jan 2023 at 20:33
> > > > > > > > > > > > > Subject: Re: Bug#1029850: linux: Driver not loaded for ST Microelectronics
> > > > > > > > > > > > > LSM6DS3TR-C accelerometer (acpi:SMO8B30:SMO8B30:)
> > > > > > > > > > > > > To: Darrell Kavanagh <darrell.kavanagh@...il.com>, <1029850@...s.debian.org>
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > Hi Darrell,
> > > > > > > > > > > > >
> > > > > > > > > > > > > On Sat, Jan 28, 2023 at 08:13:16PM +0000, Darrell Kavanagh wrote:  
> > > > > > > > > > > > > > Package: src:linux
> > > > > > > > > > > > > > Version: 6.1.4-1
> > > > > > > > > > > > > > Severity: normal
> > > > > > > > > > > > > > File: linux
> > > > > > > > > > > > > > X-Debbugs-Cc: darrell.kavanagh@...il.com
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Dear Maintainer,
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > This is a convertable touchscreen tablet/laptop. The rotation sensor  
> > > > > > > > > > > > > device  
> > > > > > > > > > > > > > ST Microelectronics LSM6DS3TR-C does not work. It is detected via ACPI  
> > > > > > > > > > > > > and the  
> > > > > > > > > > > > > > sysfs trees are created at  
> > > > > > > > > > > > > devices/pci0000:00/0000:00:17.1/i2c_designware.3/i2c-4/i2c-SMO8B30:00  
> > > > > > > > > > > > > > and devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:3c/SMO8B30:00 with
> > > > > > > > > > > > > > symlinks bus/acpi/devices/SMO8B30:00 and bus/i2c/devices/i2c-SMO8B30:00,  
> > > > > > > > > > > > > but  
> > > > > > > > > > > > > > no driver is loaded.  
> > > > > > > > > > > >
> > > > > > > > > > > > At least this is using the ST PNP ID which is better than average
> > > > > > > > > > > > (long story!)
> > > > > > > > > > > >
> > > > > > > > > > > > The driver in question (ultimately drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c
> > > > > > > > > > > > does not currently have an ACPI support.  It should be straight forwards
> > > > > > > > > > > > to add though the driver first needs converting to use
> > > > > > > > > > > > device_get_match_data() with appropriate fallback so that it will match on
> > > > > > > > > > > > ACPI, OF or original spi_device_id tables
> > > > > > > > > > > >
> > > > > > > > > > > > Completely untested but something like the following
> > > > > > > > > > > > (the offset in the enum is needed to allow us to tell if we got a result when
> > > > > > > > > > > > calling device_get_match_data() as it returns NULL on failure IIRC)
> > > > > > > > > > > >
> > > > > > > > > > > > I'm not sure how sucessful the driver will be at finding any interrupts etc, but
> > > > > > > > > > > > it may get you basic functionality.
> > > > > > > > > > > >
> > > > > > > > > > > > Good luck and others more familiar with the driver may well tell me what I forgot
> > > > > > > > > > > > when hacking the below ;)
> > > > > > > > > > > >
> > > > > > > > > > > > diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> > > > > > > > > > > > index 499fcf8875b4..2617ce236ddc 100644
> > > > > > > > > > > > --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> > > > > > > > > > > > +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> > > > > > > > > > > > @@ -39,7 +39,7 @@
> > > > > > > > > > > >  #define ST_ISM330IS_DEV_NAME   "ism330is"
> > > > > > > > > > > >
> > > > > > > > > > > >  enum st_lsm6dsx_hw_id {
> > > > > > > > > > > > -       ST_LSM6DS3_ID,
> > > > > > > > > > > > +       ST_LSM6DS3_ID = 1,
> > > > > > > > > > > >         ST_LSM6DS3H_ID,
> > > > > > > > > > > >         ST_LSM6DSL_ID,
> > > > > > > > > > > >         ST_LSM6DSM_ID,
> > > > > > > > > > > > diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c
> > > > > > > > > > > > index df5f60925260..ecfceb2fb3db 100644
> > > > > > > > > > > > --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c
> > > > > > > > > > > > +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c
> > > > > > > > > > > > @@ -23,10 +23,15 @@ static const struct regmap_config st_lsm6dsx_i2c_regmap_config = {
> > > > > > > > > > > >
> > > > > > > > > > > >  static int st_lsm6dsx_i2c_probe(struct i2c_client *client)
> > > > > > > > > > > >  {
> > > > > > > > > > > > -       const struct i2c_device_id *id = i2c_client_get_device_id(client);
> > > > > > > > > > > > -       int hw_id = id->driver_data;
> > > > > > > > > > > > +       int hw_id;
> > > > > > > > > > > >         struct regmap *regmap;
> > > > > > > > > > > >
> > > > > > > > > > > > +       hw_id = (kernel_ulong_t)device_get_match_data(&client->dev);
> > > > > > > > > > > > +       if (!hw_id)
> > > > > > > > > > > > +               hw_id = i2c_client_get_device_id(client)->driver_data;
> > > > > > > > > > > > +       if (!hw_id)
> > > > > > > > > > > > +               return -EINVAL;
> > > > > > > > > > > > +
> > > > > > > > > > > >         regmap = devm_regmap_init_i2c(client, &st_lsm6dsx_i2c_regmap_config);
> > > > > > > > > > > >         if (IS_ERR(regmap)) {
> > > > > > > > > > > >                 dev_err(&client->dev, "Failed to register i2c regmap %ld\n", PTR_ERR(regmap));
> > > > > > > > > > > > @@ -129,6 +134,10 @@ static const struct of_device_id st_lsm6dsx_i2c_of_match[] = {
> > > > > > > > > > > >  };
> > > > > > > > > > > >  MODULE_DEVICE_TABLE(of, st_lsm6dsx_i2c_of_match);
> > > > > > > > > > > >
> > > > > > > > > > > > +static const struct acpi_device_id st_lsm6dsx_i2c_acpi_match[] = {
> > > > > > > > > > > > +       { "SMO8B30", ST_LSM6DS3TRC_ID, },
> > > > > > > > > > > > +};
> > > > > > > > > > > > +
> > > > > > > > > > > >  static const struct i2c_device_id st_lsm6dsx_i2c_id_table[] = {
> > > > > > > > > > > >         { ST_LSM6DS3_DEV_NAME, ST_LSM6DS3_ID },
> > > > > > > > > > > >         { ST_LSM6DS3H_DEV_NAME, ST_LSM6DS3H_ID },
> > > > > > > > > > > > @@ -161,6 +170,7 @@ static struct i2c_driver st_lsm6dsx_driver = {
> > > > > > > > > > > >                 .name = "st_lsm6dsx_i2c",
> > > > > > > > > > > >                 .pm = pm_sleep_ptr(&st_lsm6dsx_pm_ops),
> > > > > > > > > > > >                 .of_match_table = st_lsm6dsx_i2c_of_match,
> > > > > > > > > > > > +               .acpi_match_table = st_lsm6dsx_i2c_acpi_match,
> > > > > > > > > > > >         },
> > > > > > > > > > > >         .probe_new = st_lsm6dsx_i2c_probe,
> > > > > > > > > > > >         .id_table = st_lsm6dsx_i2c_id_table,
> > > > > > > > > > > >
> > > > > > > > > > > >  
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > The device is identifying itself to the kernel with PNP id SMO8B30:
> > > > > > > > > > > > > > physical_node:
> > > > > > > > > > > > > >       modalias=acpi:SMO8B30:SMO8B30:
> > > > > > > > > > > > > >       name=SMO8B30:00
> > > > > > > > > > > > > >       uevent=MODALIAS=acpi:SMO8B30:SMO8B30:
> > > > > > > > > > > > > >       waiting_for_supplier=0
> > > > > > > > > > > > > > firmware_node:
> > > > > > > > > > > > > >       hid=SMO8B30
> > > > > > > > > > > > > >       modalias=acpi:SMO8B30:SMO8B30:
> > > > > > > > > > > > > >       path=\_SB_.PCI0.I2C5.DEV_
> > > > > > > > > > > > > >       status=15
> > > > > > > > > > > > > >       uevent=MODALIAS=acpi:SMO8B30:SMO8B30:
> > > > > > > > > > > > > >       uid=0
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > The kernel module for the appropriate driver (st_lsm6dsx_i2c) is not  
> > > > > > > > > > > > > loaded on boot.  
> > > > > > > > > > > > > > Modprobing it does not associate it with the device, as I would expect as
> > > > > > > > > > > > > > the module does not provide an alias for the above acpi/pnp id.  
> > > > > > > > > > > > >
> > > > > > > > > > > > > Can you report this issue upstream? Gues to reach out are according to
> > > > > > > > > > > > > get_maintainers.pl script:
> > > > > > > > > > > > >
> > > > > > > > > > > > > Lorenzo Bianconi <lorenzo@...nel.org> (maintainer:ST LSM6DSx IMU IIO DRIVER)
> > > > > > > > > > > > > Jonathan Cameron <jic23@...nel.org> (maintainer:IIO SUBSYSTEM AND DRIVERS)
> > > > > > > > > > > > > Lars-Peter Clausen <lars@...afoo.de> (reviewer:IIO SUBSYSTEM AND DRIVERS)
> > > > > > > > > > > > > linux-iio@...r.kernel.org (open list:ST LSM6DSx IMU IIO DRIVER)
> > > > > > > > > > > > > linux-kernel@...r.kernel.org (open list)
> > > > > > > > > > > > >
> > > > > > > > > > > > > Please keep us in the loop.
> > > > > > > > > > > > >
> > > > > > > > > > > > > Regards,
> > > > > > > > > > > > > Salvatore  
> > > > > > > > > > > >  
> > > > > > > > > >  
> > > > > > > >  
> > > > > >  
> > > >  

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