diff options
Diffstat (limited to 'drivers/iio/accel/bma400.h')
| -rw-r--r-- | drivers/iio/accel/bma400.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/iio/accel/bma400.h b/drivers/iio/accel/bma400.h new file mode 100644 index 0000000000..932358b45f --- /dev/null +++ b/drivers/iio/accel/bma400.h @@ -0,0 +1,149 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Register constants and other forward declarations needed by the bma400 + * sources. + * + * Copyright 2019 Dan Robertson <dan@dlrobertson.com> + */ + +#ifndef _BMA400_H_ +#define _BMA400_H_ + +#include <linux/bits.h> +#include <linux/regmap.h> + +/* + * Read-Only Registers + */ + +/* Status and ID registers */ +#define BMA400_CHIP_ID_REG 0x00 +#define BMA400_ERR_REG 0x02 +#define BMA400_STATUS_REG 0x03 + +/* Acceleration registers */ +#define BMA400_X_AXIS_LSB_REG 0x04 +#define BMA400_X_AXIS_MSB_REG 0x05 +#define BMA400_Y_AXIS_LSB_REG 0x06 +#define BMA400_Y_AXIS_MSB_REG 0x07 +#define BMA400_Z_AXIS_LSB_REG 0x08 +#define BMA400_Z_AXIS_MSB_REG 0x09 + +/* Sensor time registers */ +#define BMA400_SENSOR_TIME0 0x0a +#define BMA400_SENSOR_TIME1 0x0b +#define BMA400_SENSOR_TIME2 0x0c + +/* Event and interrupt registers */ +#define BMA400_EVENT_REG 0x0d +#define BMA400_INT_STAT0_REG 0x0e +#define BMA400_INT_STAT1_REG 0x0f +#define BMA400_INT_STAT2_REG 0x10 +#define BMA400_INT12_MAP_REG 0x23 +#define BMA400_INT_ENG_OVRUN_MSK BIT(4) + +/* Temperature register */ +#define BMA400_TEMP_DATA_REG 0x11 + +/* FIFO length and data registers */ +#define BMA400_FIFO_LENGTH0_REG 0x12 +#define BMA400_FIFO_LENGTH1_REG 0x13 +#define BMA400_FIFO_DATA_REG 0x14 + +/* Step count registers */ +#define BMA400_STEP_CNT0_REG 0x15 +#define BMA400_STEP_CNT1_REG 0x16 +#define BMA400_STEP_CNT3_REG 0x17 +#define BMA400_STEP_STAT_REG 0x18 +#define BMA400_STEP_INT_MSK BIT(0) +#define BMA400_STEP_RAW_LEN 0x03 +#define BMA400_STEP_STAT_MASK GENMASK(9, 8) + +/* + * Read-write configuration registers + */ +#define BMA400_ACC_CONFIG0_REG 0x19 +#define BMA400_ACC_CONFIG1_REG 0x1a +#define BMA400_ACC_CONFIG2_REG 0x1b +#define BMA400_CMD_REG 0x7e + +/* Interrupt registers */ +#define BMA400_INT_CONFIG0_REG 0x1f +#define BMA400_INT_CONFIG1_REG 0x20 +#define BMA400_INT1_MAP_REG 0x21 +#define BMA400_INT_IO_CTRL_REG 0x24 +#define BMA400_INT_DRDY_MSK BIT(7) + +/* Chip ID of BMA 400 devices found in the chip ID register. */ +#define BMA400_ID_REG_VAL 0x90 + +#define BMA400_LP_OSR_SHIFT 5 +#define BMA400_NP_OSR_SHIFT 4 +#define BMA400_SCALE_SHIFT 6 + +#define BMA400_TWO_BITS_MASK GENMASK(1, 0) +#define BMA400_LP_OSR_MASK GENMASK(6, 5) +#define BMA400_NP_OSR_MASK GENMASK(5, 4) +#define BMA400_ACC_ODR_MASK GENMASK(3, 0) +#define BMA400_ACC_SCALE_MASK GENMASK(7, 6) + +#define BMA400_ACC_ODR_MIN_RAW 0x05 +#define BMA400_ACC_ODR_LP_RAW 0x06 +#define BMA400_ACC_ODR_MAX_RAW 0x0b + +#define BMA400_ACC_ODR_MAX_HZ 800 +#define BMA400_ACC_ODR_MIN_WHOLE_HZ 25 +#define BMA400_ACC_ODR_MIN_HZ 12 + +/* Generic interrupts register */ +#define BMA400_GEN1INT_CONFIG0 0x3f +#define BMA400_GEN2INT_CONFIG0 0x4A +#define BMA400_GEN_CONFIG1_OFF 0x01 +#define BMA400_GEN_CONFIG2_OFF 0x02 +#define BMA400_GEN_CONFIG3_OFF 0x03 +#define BMA400_GEN_CONFIG31_OFF 0x04 +#define BMA400_INT_GEN1_MSK BIT(2) +#define BMA400_INT_GEN2_MSK BIT(3) +#define BMA400_GEN_HYST_MSK GENMASK(1, 0) + +/* TAP config registers */ +#define BMA400_TAP_CONFIG 0x57 +#define BMA400_TAP_CONFIG1 0x58 +#define BMA400_S_TAP_MSK BIT(2) +#define BMA400_D_TAP_MSK BIT(3) +#define BMA400_INT_S_TAP_MSK BIT(10) +#define BMA400_INT_D_TAP_MSK BIT(11) +#define BMA400_TAP_SEN_MSK GENMASK(2, 0) +#define BMA400_TAP_TICSTH_MSK GENMASK(1, 0) +#define BMA400_TAP_QUIET_MSK GENMASK(3, 2) +#define BMA400_TAP_QUIETDT_MSK GENMASK(5, 4) +#define BMA400_TAP_TIM_LIST_LEN 4 + +/* + * BMA400_SCALE_MIN macro value represents m/s^2 for 1 LSB before + * converting to micro values for +-2g range. + * + * For +-2g - 1 LSB = 0.976562 milli g = 0.009576 m/s^2 + * For +-4g - 1 LSB = 1.953125 milli g = 0.019153 m/s^2 + * For +-16g - 1 LSB = 7.8125 milli g = 0.076614 m/s^2 + * + * The raw value which is used to select the different ranges is determined + * by the first bit set position from the scale value, so BMA400_SCALE_MIN + * should be odd. + * + * Scale values for +-2g, +-4g, +-8g and +-16g are populated into bma400_scales + * array by left shifting BMA400_SCALE_MIN. + * e.g.: + * To select +-2g = 9577 << 0 = raw value to write is 0. + * To select +-8g = 9577 << 2 = raw value to write is 2. + * To select +-16g = 9577 << 3 = raw value to write is 3. + */ +#define BMA400_SCALE_MIN 9577 +#define BMA400_SCALE_MAX 76617 + +extern const struct regmap_config bma400_regmap_config; + +int bma400_probe(struct device *dev, struct regmap *regmap, int irq, + const char *name); + +#endif |