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iio: accel: bmc150: Get mount-matrix from ACPI

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bmc150 accelerometers with an ACPI hardware-id of BOSC0200 have an ACPI
method providing their mount-matrix, add support for retrieving this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20201130141954.339805-3-hdegoede@redhat.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Hans de Goede 2020-11-30 15:19:54 +01:00 committed by Jonathan Cameron
parent 5bfb3a4bd8
commit 8a06720034
1 changed files with 104 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

108
drivers/iio/accel/bmc150-accel-core.c
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@ -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