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iio: imu: lsm6dsx: Add ACPI mount matrix retrieval

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DSDT ROTM method seen in the wild with SMO8B30 _HID.
Making assumption it is similar to that used for bmc150 plus
information from Darrell that the rotation is out by 90 degrees at boot.

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 */
}

Reported-by: Darrell Kavanagh <darrell.kavanagh@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Tested-by: Darrell Kavanagh <darrell.kavanagh@gmail.org>
Link: https://lore.kernel.org/r/20230130201018.981024-3-jic23@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jonathan Cameron 2023-01-30 20:10:18 +00:00 committed by Jonathan Cameron
parent bd66b6acd2
commit dc3d25f22b
1 changed files with 74 additions and 3 deletions
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77
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
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@ -56,6 +56,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
@ -2624,6 +2625,73 @@ static int st_lsm6dsx_init_regulators(struct device *dev)
return 0;
}
#ifdef CONFIG_ACPI
static int lsm6dsx_get_acpi_mount_matrix(struct device *dev,
struct iio_mount_matrix *orientation)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_device *adev = ACPI_COMPANION(dev);
union acpi_object *obj, *elements;
acpi_status status;
int i, j, val[3];
char *str;
if (!has_acpi_companion(dev))
return -EINVAL;
if (!acpi_has_method(adev->handle, "ROTM"))
return -EINVAL;
status = acpi_evaluate_object(adev->handle, "ROTM", NULL, &buffer);
if (ACPI_FAILURE(status)) {
dev_warn(dev, "Failed to get ACPI mount matrix: %d\n", status);
return -EINVAL;
}
obj = buffer.pointer;
if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count != 3)
goto unknown_format;
elements = obj->package.elements;
for (i = 0; i < 3; i++) {
if (elements[i].type != ACPI_TYPE_STRING)
goto unknown_format;
str = elements[i].string.pointer;
if (sscanf(str, "%d %d %d", &val[0], &val[1], &val[2]) != 3)
goto unknown_format;
for (j = 0; j < 3; j++) {
switch (val[j]) {
case -1: str = "-1"; break;
case 0: str = "0"; break;
case 1: str = "1"; break;
default: goto unknown_format;
}
orientation->rotation[i * 3 + j] = str;
}
}
kfree(buffer.pointer);
return 0;
unknown_format:
dev_warn(dev, "Unknown ACPI mount matrix format, ignoring\n");
kfree(buffer.pointer);
return -EINVAL;
}
#else
static int lsm6dsx_get_acpi_mount_matrix(struct device *dev,
struct iio_mount_matrix *orientation)
{
return false;
}
#endif
int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id,
struct regmap *regmap)
{
@ -2698,9 +2766,12 @@ int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id,
return err;
}
err = iio_read_mount_matrix(hw->dev, &hw->orientation);
if (err)
return err;
err = lsm6dsx_get_acpi_mount_matrix(hw->dev, &hw->orientation);
if (err) {
err = iio_read_mount_matrix(hw->dev, &hw->orientation);
if (err)
return err;
}
for (i = 0; i < ST_LSM6DSX_ID_MAX; i++) {
if (!hw->iio_devs[i])