diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/accel/bmc150-accel-core.c | 108 |
1 files changed, 104 insertions, 4 deletions
diff --git a/drivers/iio/accel/bmc150-accel-core.c b/drivers/iio/accel/bmc150-accel-core.c index 746555a6a403..7e425ebcd7ea 100644 --- a/drivers/iio/accel/bmc150-accel-core.c +++ b/drivers/iio/accel/bmc150-accel-core.c @@ -413,6 +413,103 @@ static int bmc150_accel_set_power_state(struct bmc150_accel_data *data, bool on) } #endif +#ifdef CONFIG_ACPI +/* + * Support for getting accelerometer information from BOSC0200 ACPI nodes. + * + * There are 2 variants of the BOSC0200 ACPI node. Some 2-in-1s with 360 degree + * hinges declare 2 I2C ACPI-resources for 2 accelerometers, 1 in the display + * and 1 in the base of the 2-in-1. On these 2-in-1s the ROMS ACPI object + * contains the mount-matrix for the sensor in the display and ROMK contains + * the mount-matrix for the sensor in the base. On devices using a single + * sensor there is a ROTM ACPI object which contains the mount-matrix. + * + * Here is an incomplete list of devices known to use 1 of these setups: + * + * Yoga devices with 2 accelerometers using ROMS + ROMK for the mount-matrices: + * Lenovo Thinkpad Yoga 11e 3th gen + * Lenovo Thinkpad Yoga 11e 4th gen + * + * Tablets using a single accelerometer using ROTM for the mount-matrix: + * Chuwi Hi8 Pro (CWI513) + * Chuwi Vi8 Plus (CWI519) + * Chuwi Hi13 + * Irbis TW90 + * Jumper EZpad mini 3 + * Onda V80 plus + * Predia Basic Tablet + */ +static bool bmc150_apply_acpi_orientation(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; + char *name, *alt_name, *str; + acpi_status status; + int i, j, val[3]; + + if (!adev || !acpi_dev_hid_uid_match(adev, "BOSC0200", NULL)) + return false; + + if (strcmp(dev_name(dev), "i2c-BOSC0200:base") == 0) + alt_name = "ROMK"; + else + alt_name = "ROMS"; + + if (acpi_has_method(adev->handle, "ROTM")) + name = "ROTM"; + else if (acpi_has_method(adev->handle, alt_name)) + name = alt_name; + 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; +} +#else +static bool bmc150_apply_acpi_orientation(struct device *dev, + struct iio_mount_matrix *orientation) +{ + return false; +} +#endif + static const struct bmc150_accel_interrupt_info { u8 map_reg; u8 map_bitmask; @@ -1585,10 +1682,13 @@ int bmc150_accel_core_probe(struct device *dev, struct regmap *regmap, int irq, data->regmap = regmap; - ret = iio_read_mount_matrix(dev, "mount-matrix", - &data->orientation); - if (ret) - return ret; + if (!bmc150_apply_acpi_orientation(dev, &data->orientation)) { + ret = iio_read_mount_matrix(dev, "mount-matrix", + &data->orientation); + if (ret) + return ret; + } + /* * VDD is the analog and digital domain voltage supply * VDDIO is the digital I/O voltage supply |