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