Message-ID: <20230201102824.00002044@Huawei.com>
Date:   Wed, 1 Feb 2023 10:28:24 +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>,
        "Hans de Goede" <hdegoede@...hat.com>
Subject: Re: Bug#1029850: linux: Driver not loaded for ST Microelectronics
 LSM6DS3TR-C accelerometer (acpi:SMO8B30:SMO8B30:)

On Wed, 1 Feb 2023 01:40:49 +0000
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.

Added Hans de Goede as he has probably run into more of this mess
than anyone else.  Hans, any thoughts on if we are doing something
wrong on kernel side?  Or is the matrix just wrong *sigh*
I think 'ROTM' is defined by MS. 
https://learn.microsoft.com/en-us/windows-hardware/drivers/sensors/sensors-acpi-entries



> 
> 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.

I'll certainly pick up the ID patch, but I'm dubious about the mount
matrix unless we manage to establish why it isn't directly giving us
the right answer (and what the solution should be).


Jonathan

> 
> 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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