drivers/iio/accel/adxl345.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * ADXL345 3-Axis Digital Accelerometer
   4  *
   5  * Copyright (c) 2017 Eva Rachel Retuya <eraretuya@gmail.com>
   6  */
   7
   8 #ifndef _ADXL345_H_
   9 #define _ADXL345_H_
  10
  11 #define ADXL345_REG_DEVID               0x00
  12 #define ADXL345_REG_OFSX                0x1E
  13 #define ADXL345_REG_OFSY                0x1F
  14 #define ADXL345_REG_OFSZ                0x20
  15 #define ADXL345_REG_OFS_AXIS(index)     (ADXL345_REG_OFSX + (index))
  16 #define ADXL345_REG_BW_RATE             0x2C
  17 #define ADXL345_REG_POWER_CTL           0x2D
  18 #define ADXL345_REG_DATA_FORMAT         0x31
  19 #define ADXL345_REG_DATAX0              0x32
  20 #define ADXL345_REG_DATAY0              0x34
  21 #define ADXL345_REG_DATAZ0              0x36
  22 #define ADXL345_REG_DATA_AXIS(index)    \
  23         (ADXL345_REG_DATAX0 + (index) * sizeof(__le16))
  24
  25 #define ADXL345_BW_RATE                 GENMASK(3, 0)
  26 #define ADXL345_BASE_RATE_NANO_HZ       97656250LL
  27
  28 #define ADXL345_POWER_CTL_MEASURE       BIT(3)
  29 #define ADXL345_POWER_CTL_STANDBY       0x00
  30
  31 #define ADXL345_DATA_FORMAT_RANGE       GENMASK(1, 0)   /* Set the g range */
  32 #define ADXL345_DATA_FORMAT_JUSTIFY     BIT(2)  /* Left-justified (MSB) mode */
  33 #define ADXL345_DATA_FORMAT_FULL_RES    BIT(3)  /* Up to 13-bits resolution */
  34 #define ADXL345_DATA_FORMAT_SPI_3WIRE   BIT(6)  /* 3-wire SPI mode */
  35 #define ADXL345_DATA_FORMAT_SELF_TEST   BIT(7)  /* Enable a self test */
  36
  37 #define ADXL345_DATA_FORMAT_2G          0
  38 #define ADXL345_DATA_FORMAT_4G          1
  39 #define ADXL345_DATA_FORMAT_8G          2
  40 #define ADXL345_DATA_FORMAT_16G         3
  41
  42 #define ADXL345_DEVID                   0xE5
  43
  44 /*
  45  * In full-resolution mode, scale factor is maintained at ~4 mg/LSB
  46  * in all g ranges.
  47  *
  48  * At +/- 16g with 13-bit resolution, scale is computed as:
  49  * (16 + 16) * 9.81 / (2^13 - 1) = 0.0383
  50  */
  51 #define ADXL345_USCALE  38300
  52
  53 /*
  54  * The Datasheet lists a resolution of Resolution is ~49 mg per LSB. That's
  55  * ~480mm/s**2 per LSB.
  56  */
  57 #define ADXL375_USCALE  480000
  58
  59 struct adxl345_chip_info {
  60         const char *name;
  61         int uscale;
  62 };
  63
  64 int adxl345_core_probe(struct device *dev, struct regmap *regmap,
  65                        int (*setup)(struct device*, struct regmap*));
  66
  67 #endif /* _ADXL345_H_ */