94322e503c
Convert ak8975 sensor driver to utilize device tree.
This also supports the ak8975 embedded in a invensense MPU9150. In such
a case the device tree node should look something like, where the ak8975
is a child of the mpu9150.
mpu9150@68 {
compatible = "invensense,mpu9150";
reg = <0x68>;
label = "mpu9150";
#address-cells = <1>;
#size-cells = <0>;
ak8975@c {
compatible = "asahi-kasei,ak8975";
reg = <0xc>;
label = "ak8975";
};
};
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_DRIVERS_SENSOR_AK8975_AK8975_H_
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#define ZEPHYR_DRIVERS_SENSOR_AK8975_AK8975_H_
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#include <device.h>
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#define AK8975_REG_CHIP_ID 0x00
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#define AK8975_CHIP_ID 0x48
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#define AK8975_REG_DATA_START 0x03
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#define AK8975_REG_CNTL 0x0A
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#define AK8975_MODE_MEASURE 0x01
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#define AK8975_MODE_FUSE_ACCESS 0x0F
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#define AK8975_REG_ADJ_DATA_START 0x10
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#define AK8975_MEASURE_TIME_US 9000
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#define AK8975_MICRO_GAUSS_PER_BIT 3000
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#ifdef DT_INST_0_INVENSENSE_MPU9150_BASE_ADDRESS
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#if DT_INST_0_ASAHI_KASEI_AK8975_BASE_ADDRESS != 0x0C
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#error "I2C address must be 0x0C when AK8975 is part of a MPU9150 chip"
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#endif
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#ifdef DT_INST_0_INVENSENSE_MPU9150
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#define MPU9150_I2C_ADDR DT_INST_0_INVENSENSE_MPU9150_BASE_ADDRESS
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#endif
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#define MPU9150_REG_BYPASS_CFG 0x37
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#define MPU9150_I2C_BYPASS_EN BIT(1)
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#define MPU9150_REG_PWR_MGMT1 0x6B
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#define MPU9150_SLEEP_EN BIT(6)
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#endif /* DT_INST_0_INVENSENSE_MPU9150 */
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struct ak8975_data {
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struct device *i2c;
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s16_t x_sample;
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s16_t y_sample;
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s16_t z_sample;
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u8_t x_adj;
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u8_t y_adj;
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u8_t z_adj;
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};
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#endif /* ZEPHYR_DRIVERS_SENSOR_AK8975_AK8975_H_ */
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