Compass AK8975 does not transmit data to Android 12 on the RK3588 chip

Ddenbon · 11 1月

Help me set up the AK8975 compass sensor connected via the I2C bus on a single-board computer with an RK3588 chip with Android12
The AK8975 compass does not transmit data via the I2C bus, the drivers for which are located at: kernel-5.10/drivers/input/sensors/compass/ak8975.c
1) Added it to the device tree in the file
`&i2c2 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&i2c2m4_xfer>;

ak8975_compass: ak8975@d {
	status = "okay";
	compatible = "ak8975";
	reg = <0x0d>;
	irq_enable = <0>;
	poll_delay_ms = <30>;
	type = <SENSOR_TYPE_COMPASS>;
	layout = <0>;
};

};`

2) Checked in kernel config
CONFIG_SENSOR_DEVICE=y CONFIG_COMPASS_DEVICE=y CONFIG_COMPASS_AK8975=y

3) BoardConfig.mk
BOARD_SENSOR_ST ?= true BOARD_SENSOR_COMPASS_AK8975 := true BOARD_COMPASS_SENSOR_SUPPORT := true

4) ueventd.rockchip.rc
/dev/akm8975_dev 0660 system system /dev/compass 0660 system system

5) I also check the compass with the command: adb shell dmesg | grep -i akm
I get the answer:
[ 6.556308] compass_akm8975 2-000d: sensor_register_device: akm8975, id = 38 [ 6.556774] compass_akm8975 2-000d: sensor_chip_init:ak8975:devid=0x48,ops=0x000000003d2201ef [ 6.557589] sensor_init: AK8975-driver Misc device registered successfully: akm8975_dev [ 6.557674] compass_akm8975 2-000d: sensor_irq_init:use polling,delay=30 ms [ 6.557708] compass_akm8975 2-000d: sensor_misc_device_register:miscdevice: compass [ 6.557711] compass_akm8975 2-000d: sensor_probe:initialized ok,sensor name:akm8975,type:3,id=38\x0a [ 199.652741] compass_akm8975 2-000d: set sensor poll time to 5ms [ 200.086721] compass_akm8975 2-000d: set sensor poll time to 10ms [ 222.654669] compass_akm8975 2-000d: set sensor poll time to 5ms [ 991.704449] compass_akm8975 2-000d: set sensor poll time to 5ms [ 998.886466] compass_akm8975 2-000d: set sensor poll time to 10ms

But when I check the compass in the app, I get the message: THIS SENSOR DOES NOT REPORT ANY READINGS, YOU SEEMS TO HAVE AN ERROR IN THE INTERACTION OF THE SENSOR SERVICE IN THE DEVICE FIRMWARE

Nneardi · 13 1月

From your logs, the driver appears to load successfully,

Use the i2cdetect -y 2 to confirm that the sensor is detected at address 0x0d,
Ensure that the 0x0d address is visible. If not, check hardware connections and the device tree configuration.
Use i2cget -y 2 0x0d to communicate directly with the sensor.
If the above two steps are ok, Check adb shell dumpsys sensorservice to see if the 8975 sensor is registered.