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-rw-r--r--drivers/iio/accel/bma400.h149
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