Add support for reading the "ROTM" method from APCI which contains
the mount matrix.
Cc: Jonathan Cameron <jic23@xxxxxxxxxx>
Cc: Lars-Peter Clausen <lars@xxxxxxxxxx>
Cc: "Uwe Kleine-König" <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
---
drivers/iio/accel/kxcjk-1013.c | 88 ++++++++++++++++++++++++++++++++--
1 file changed, 85 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
index 894709286b0c..760bbd95b73c 100644
--- a/drivers/iio/accel/kxcjk-1013.c
+++ b/drivers/iio/accel/kxcjk-1013.c
@@ -619,6 +619,85 @@ static int kxcjk1013_set_power_state(struct kxcjk1013_data *data, bool on)
return 0;
}
+#ifdef CONFIG_ACPI
+/*
+ * Support for getting accelerometer information from KIOX000A ACPI nodes.
+ *
+ */
+static bool kxj_acpi_orientation(struct device *dev,
+ struct iio_mount_matrix *orientation)
+{
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+ char *name, *alt_name, *label, *str;
+ union acpi_object *obj, *elements;
+ acpi_status status;
+ int i, j, val[3];
+
+ if (acpi_has_method(adev->handle, "ROTM")) {
+ name = "ROTM";
+ } else {
+ return false;
+ }
+
+ status = acpi_evaluate_object(adev->handle, name, NULL, &buffer);
+ if (ACPI_FAILURE(status)) {
+ dev_warn(dev, "Failed to get ACPI mount matrix: %d\n", status);
+ return false;
+ }
+
+ 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 true;
+
+unknown_format:
+ dev_warn(dev, "Unknown ACPI mount matrix format, ignoring\n");
+ kfree(buffer.pointer);
+ return false;
+}
+
+static bool kxj1009_apply_acpi_orientation(struct device *dev,
+ struct iio_mount_matrix *orientation)
+{
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+
+ if (adev && acpi_dev_hid_uid_match(adev, "KIOX000A", NULL))
+ return kxj_acpi_orientation(dev, orientation);
+
+ return false;
+}
+#else
+static bool kxj1009_apply_acpi_orientation(struct device *dev,
+ struct iio_mount_matrix *orientation)
+{
+ return false;
+}
+#endif
+
static int kxcjk1013_chip_update_thresholds(struct kxcjk1013_data *data)
{
int ret;
@@ -1449,9 +1528,12 @@ static int kxcjk1013_probe(struct i2c_client *client)
} else {
data->active_high_intr = true; /* default polarity */
- ret = iio_read_mount_matrix(&client->dev, &data->orientation);
- if (ret)
- return ret;
+ if (!apply_kcj1009_acpi_orientation(&client->dev, &data->orientation)) {
+ ret = iio_read_mount_matrix(&client->dev, &data->orientation);
+ if (ret)
+ return ret;
+ }
+
}
ret = devm_regulator_bulk_get_enable(&client->dev,
--
2.40.1
