Please excuse the late answer.
Thank you both, Mr. Cameron and Mr. Shevchenko, for guiding me through this.
I'll keep an eye on git, and make sure to remember your advice on any
future submissions.
Best regards,
Jesus Gonzalez
"10EC5280" is used by several manufacturers like Lenovo, GPD, or AYA (and
probably others) in their ACPI table as the ID for the bmi160 IMU. This
means the bmi160_i2c driver won't bind to it, and the IMU is unavailable
to the user. Manufacturers have been approached on several occasions to
try getting a BIOS with a fixed ID, mostly without actual positive
results, and since affected devices are already a few years old, this is
not expected to change. This patch enables using the bmi160_i2c driver for
the bmi160 IMU on these devices.
Here is the relevant extract from the DSDT of a GPD Win Max 2 (AMD 6800U
model) with the latest firmware 1.05 installed. GPD sees this as WONTFIX
with the argument of the device working with the Windows drivers.
Device (BMA2)
{
Name (_ADR, Zero) // _ADR: Address
Name (_HID, "10EC5280") // _HID: Hardware ID
Name (_CID, "10EC5280") // _CID: Compatible ID
Name (_DDN, "Accelerometer") // _DDN: DOS Device Name
Name (_UID, One) // _UID: Unique ID
Method (_CRS, 0, NotSerialized) // _CRS: Current Resource Settings
{
Name (RBUF, ResourceTemplate ()
{
I2cSerialBusV2 (0x0069, ControllerInitiated, 0x00061A80,
AddressingMode7Bit, "\\_SB.I2CC",
0x00, ResourceConsumer, , Exclusive,
)
})
Return (RBUF) /* \_SB_.I2CC.BMA2._CRS.RBUF */
}
...
}
Signed-off-by: Jesus Gonzalez <jesusmgh@xxxxxxxxx>
For future reference don't send a new version in reply to the old one.
It makes a big mess in many people's email clients
if we get lots of versions. The patch naming is enough to associate
the different versions.
Applied to the togreg branch of iio.git and pushed out as testing for 0-day
to take a look at it.
Thanks,
Jonathan
---
v4: Moved comment back to relevant position inside function
drivers/iio/imu/bmi160/bmi160_i2c.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/iio/imu/bmi160/bmi160_i2c.c b/drivers/iio/imu/bmi160/bmi160_i2c.c
index 81652c08e644..a081305254db 100644
--- a/drivers/iio/imu/bmi160/bmi160_i2c.c
+++ b/drivers/iio/imu/bmi160/bmi160_i2c.c
@@ -43,6 +43,15 @@ static const struct i2c_device_id bmi160_i2c_id[] = {
MODULE_DEVICE_TABLE(i2c, bmi160_i2c_id);
static const struct acpi_device_id bmi160_acpi_match[] = {
+ /*
+ * FIRMWARE BUG WORKAROUND
+ * Some manufacturers like GPD, Lenovo or Aya used the incorrect
+ * ID "10EC5280" for bmi160 in their DSDT. A fixed firmware is not
+ * available as of Feb 2024 after trying to work with OEMs, and
+ * this is not expected to change anymore since at least some of
+ * the affected devices are from 2021/2022.
+ */
+ {"10EC5280", 0},
{"BMI0160", 0},
{ },
};
