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iio: accel: mxc4005: Read orientation matrix from ACPI ROTM method

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Some devices use the semi-standard ACPI "ROTM" method to store
the accelerometers orientation matrix.

Add support for this using the new iio_read_acpi_mount_matrix() helper, if
the helper fails to read the matrix fall back to iio_read_mount_matrix()
which will try to get it from device-properties (devicetree) and if
that fails it will fill the matrix with the identity matrix.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=218578
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240425125754.76010-5-hdegoede@redhat.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Hans de Goede 2024-04-25 14:57:54 +02:00 committed by Jonathan Cameron
parent dd3f40b539
commit 4a8e1e020a
1 changed files with 22 additions and 0 deletions
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22
drivers/iio/accel/mxc4005.c
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@ -56,6 +56,7 @@ struct mxc4005_data {
struct mutex mutex;
struct regmap *regmap;
struct iio_trigger *dready_trig;
struct iio_mount_matrix orientation;
/* Ensure timestamp is naturally aligned */
struct {
__be16 chans[3];
@ -259,6 +260,20 @@ static int mxc4005_write_raw(struct iio_dev *indio_dev,
}
}
static const struct iio_mount_matrix *
mxc4005_get_mount_matrix(const struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct mxc4005_data *data = iio_priv(indio_dev);
return &data->orientation;
}
static const struct iio_chan_spec_ext_info mxc4005_ext_info[] = {
IIO_MOUNT_MATRIX(IIO_SHARED_BY_TYPE, mxc4005_get_mount_matrix),
{ }
};
static const struct iio_info mxc4005_info = {
.read_raw = mxc4005_read_raw,
.write_raw = mxc4005_write_raw,
@ -285,6 +300,7 @@ static const unsigned long mxc4005_scan_masks[] = {
.shift = 4, \
.endianness = IIO_BE, \
}, \
.ext_info = mxc4005_ext_info, \
}
static const struct iio_chan_spec mxc4005_channels[] = {
@ -415,6 +431,12 @@ static int mxc4005_probe(struct i2c_client *client)
mutex_init(&data->mutex);
if (!iio_read_acpi_mount_matrix(&client->dev, &data->orientation, "ROTM")) {
ret = iio_read_mount_matrix(&client->dev, &data->orientation);
if (ret)
return ret;
}
indio_dev->channels = mxc4005_channels;
indio_dev->num_channels = ARRAY_SIZE(mxc4005_channels);
indio_dev->available_scan_masks = mxc4005_scan_masks;