Date:   Mon, 30 Jan 2023 13:08:47 +0000
From:   Darrell Kavanagh <darrell.kavanagh@...il.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Bug#1029850: linux: Driver not loaded for ST Microelectronics
 LSM6DS3TR-C accelerometer (acpi:SMO8B30:SMO8B30:)

Here is what I hope is the relevant section from the DSDT:

    Scope (_SB.PCI0.I2C5)
    {
        Device (DEV)
        {
            Name (_HID, EisaId ("SMO8B30"))  // _HID: Hardware ID
            Name (_CID, EisaId ("SMO8B30"))  // _CID: Compatible ID
            Name (_UID, Zero)  // _UID: Unique ID
            Method (_CRS, 0, NotSerialized)  // _CRS: Current Resource Settings
            {
                Name (RBUF, ResourceTemplate ()
                {
                    I2cSerialBusV2 (0x006A, ControllerInitiated, 0x00061A80,
                        AddressingMode7Bit, "\\_SB.PCI0.I2C5",
                        0x00, ResourceConsumer, , Exclusive,
                        )
                })
                Return (RBUF) /* \_SB_.PCI0.I2C5.DEV_._CRS.RBUF */
            }

            Method (ROTM, 0, NotSerialized)
            {
                Name (RBUF, Package (0x03)
                {
                    "0 -1 0",
                    "1 0 0",
                    "0 0 1"
                })
                Return (RBUF) /* \_SB_.PCI0.I2C5.DEV_.ROTM.RBUF */
            }

            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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