Searched hist:"65 f79b501030678393eae0ae03d60a8151fbef55" (Results 1 – 3 of 3) sorted by relevance
| /openbmc/linux/arch/arm64/boot/dts/qcom/ |
| H A D | msm8916-samsung-serranove.dts | diff 3ae82f22ed7a746a8a9e89ea840401c46deddbb3 Sun Sep 04 16:49:35 CDT 2022 Jakob Hauser <jahau@rocketmail.com> arm64: dts: qcom: msm8916-samsung-serranove: Add magnetometer
Add magnetometer Yamaha YAS537 to the DeviceTree of samsung-serranove.
The YAS537 variant was recently added to the Yamaha YAS magnetometers
driver [1].
In the DeviceTree of samsung-serranove for the Android kernel, there is
unfortunately no information on interrupts or pinctrl [2].
In the Android kernel driver for magnetometer Yamaha YAS537, there is a
device-specific matrix to correct an ellipsoid shape of the measure values
into a sphere shape [3]. This could be converted and applied to a mount-matrix.
However, the current state of the mainline Yamaha YAS537 driver needs
post-process calibration in userspace anyway, as it lacks a formula to center
the measure values around zero. The correction of the ellipsoid into a sphere
can be done in the post-process calibration as well.
A mount-matrix is needed nonetheless. When putting samsung-serranove flat on
a table in portrait orientation heading north, the Yamaha YAS537 magnetometer
axes natively point X+ to north, Y+ to east and Z+ into the ground, which
corresponds to a common way to define the Earth's magnetic field coordinate
system [4]. According to the IIO definition, it should be Y+ to north, X+ to
east and Z+ upwards [5], which corresponds to a common device coordinate system
and eases sensor fusing.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/iio/magnetometer/yamaha-yas530.c?id=65f79b501030678393eae0ae03d60a8151fbef55
[2] https://github.com/msm8916-mainline/android_kernel_qcom_msm8916/blob/GT-I9195I/arch/arm/boot/dts/samsung/msm8916/msm8916-sec-serranovelte-eur-r03.dtsi#L318-L321
[3] https://github.com/msm8916-mainline/android_kernel_qcom_msm8916/blob/GT-I9195I/drivers/iio/magnetometer/yas_mag_drv-yas537.c#L105-L106
[4] https://en.wikipedia.org/wiki/Earth%27s_magnetic_field#Characteristics
[5] https://github.com/torvalds/linux/blob/v5.19/Documentation/devicetree/bindings/iio/mount-matrix.txt#L93-L126
Cc: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Jakob Hauser <jahau@rocketmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220904214935.31032-1-jahau@rocketmail.com
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| /openbmc/linux/drivers/iio/magnetometer/ |
| H A D | yamaha-yas530.c | diff 65f79b501030678393eae0ae03d60a8151fbef55 Fri Aug 12 17:05:03 CDT 2022 Jakob Hauser <jahau@rocketmail.com> iio: magnetometer: yas530: Add YAS537 variant
Add support for the magnetometer Yamaha YAS537. The additions are based on
comparison of Yamaha Android kernel drivers for YAS532 [1] and YAS537 [2].
In the Yamaha YAS537 Android driver, there is an overflow/underflow control
implemented. For regular usage, this seems not necessary. A similar overflow/
underflow control of Yamaha YAS530/532 Android driver isn't integrated in the
mainline driver. It is therefore skipped for YAS537 in the mainline too.
Also in the Yamaha YAS537 Android driver, at the end of the reset_yas537()
function, a measurement is saved in "last_after_rcoil". Later on, this is
compared to current measurements. If the difference gets too big, a new
reset is initialized. The difference in measurements needs to be quite big,
it's hard to say if this is necessary for regular operation. Therefore this
isn't integrated in the mainline driver either.
[1] https://github.com/msm8916-mainline/android_kernel_qcom_msm8916/blob/GT-I9195I/drivers/iio/magnetometer/yas_mag_drv-yas532.c
[2] https://github.com/msm8916-mainline/android_kernel_qcom_msm8916/blob/GT-I9195I/drivers/iio/magnetometer/yas_mag_drv-yas537.c
Signed-off-by: Jakob Hauser <jahau@rocketmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/264c6488733a5c32089c9ab406a5bcb808c48fef.1660337264.git.jahau@rocketmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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| H A D | Kconfig | diff 65f79b501030678393eae0ae03d60a8151fbef55 Fri Aug 12 17:05:03 CDT 2022 Jakob Hauser <jahau@rocketmail.com> iio: magnetometer: yas530: Add YAS537 variant
Add support for the magnetometer Yamaha YAS537. The additions are based on
comparison of Yamaha Android kernel drivers for YAS532 [1] and YAS537 [2].
In the Yamaha YAS537 Android driver, there is an overflow/underflow control
implemented. For regular usage, this seems not necessary. A similar overflow/
underflow control of Yamaha YAS530/532 Android driver isn't integrated in the
mainline driver. It is therefore skipped for YAS537 in the mainline too.
Also in the Yamaha YAS537 Android driver, at the end of the reset_yas537()
function, a measurement is saved in "last_after_rcoil". Later on, this is
compared to current measurements. If the difference gets too big, a new
reset is initialized. The difference in measurements needs to be quite big,
it's hard to say if this is necessary for regular operation. Therefore this
isn't integrated in the mainline driver either.
[1] https://github.com/msm8916-mainline/android_kernel_qcom_msm8916/blob/GT-I9195I/drivers/iio/magnetometer/yas_mag_drv-yas532.c
[2] https://github.com/msm8916-mainline/android_kernel_qcom_msm8916/blob/GT-I9195I/drivers/iio/magnetometer/yas_mag_drv-yas537.c
Signed-off-by: Jakob Hauser <jahau@rocketmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/264c6488733a5c32089c9ab406a5bcb808c48fef.1660337264.git.jahau@rocketmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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