Re: [PATCH 1/2] iio: imu: lsm6dsx: Support SMO8B30 ACPI ID for LSM6DS3TR-C

[Jonathan Cameron <jic23@kernel.org>]

On Mon, 30 Jan 2023 20:10:17 +0000
Jonathan Cameron <jic23@kernel.org> wrote:

> From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> 
> ID seen in the wild and it is a valid ST micro ID.
> An offset of 1 for the device ID enum is needed when adding support for
> retrieving the ID from device_get_match_data() to allow detection of
> NULL pointer and fallback to i2c_device_id table.
> 
> DSDT chunk cropped for relevant parts.
> 
>    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 */
>             }
> ...
> 
> Link: https://lore.kernel.org/all/20230129182441.082f29d0@jic23-huawei/
> Reported-by: Darrell Kavanagh <darrell.kavanagh@gmail.com>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

I'd forgotten about these.  Still I have another few
patches waiting on dependency unwinding so will need to do a second
pull request later this week (first one will probably be tomorrow).

I've applied this pair and pushed out as testing for 0-day to take
an initial look at them.

Note I will definitely be rebasing though as need the tree to move
forwards for the palmas series.

Thanks

Jonathan

> ---
> 
> Since initial posting in thread added missing {} to terminate the
> list of IDs and MODULE_DEVICE_TABLE() so that autoloading of the
> driver works (thanks Darrell!)
> 
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h     |  2 +-
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c | 16 ++++++++++++++--
>  2 files changed, 15 insertions(+), 3 deletions(-)
> 
> 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..8ae5a485ce7d 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 +134,12 @@ 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, },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(acpi, st_lsm6dsx_i2c_acpi_match);
> +
>  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 +172,7 @@ 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,