drivers/iio/chemical/bme680.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef BME680_H_
   3 #define BME680_H_
   4
   5 #include <linux/regmap.h>
   6
   7 #define BME680_REG_CHIP_ID                      0xD0
   8 #define   BME680_CHIP_ID_VAL                    0x61
   9 #define BME680_REG_SOFT_RESET                   0xE0
  10 #define   BME680_CMD_SOFTRESET                  0xB6
  11 #define BME680_REG_STATUS                       0x73
  12 #define   BME680_SPI_MEM_PAGE_BIT               BIT(4)
  13 #define     BME680_SPI_MEM_PAGE_1_VAL           1
  14
  15 #define BME680_REG_TEMP_MSB                     0x22
  16 #define BME680_REG_PRESS_MSB                    0x1F
  17 #define BME680_REG_HUMIDITY_MSB                 0x25
  18 #define BME680_REG_GAS_MSB                      0x2A
  19 #define BME680_REG_GAS_R_LSB                    0x2B
  20 #define   BME680_GAS_STAB_BIT                   BIT(4)
  21 #define   BME680_GAS_RANGE_MASK                 GENMASK(3, 0)
  22
  23 #define BME680_REG_CTRL_HUMIDITY                0x72
  24 #define   BME680_OSRS_HUMIDITY_MASK             GENMASK(2, 0)
  25
  26 #define BME680_REG_CTRL_MEAS                    0x74
  27 #define   BME680_OSRS_TEMP_MASK                 GENMASK(7, 5)
  28 #define   BME680_OSRS_PRESS_MASK                GENMASK(4, 2)
  29 #define   BME680_MODE_MASK                      GENMASK(1, 0)
  30
  31 #define BME680_REG_CONFIG                       0x75
  32 #define   BME680_FILTER_MASK                    GENMASK(4, 2)
  33 #define     BME680_FILTER_COEFF_VAL             BIT(1)
  34
  35 /* TEMP/PRESS/HUMID reading skipped */
  36 #define BME680_MEAS_SKIPPED                     0x8000
  37
  38 #define BME680_MAX_OVERFLOW_VAL                 0x40000000
  39 #define BME680_HUM_REG_SHIFT_VAL                4
  40 #define BME680_BIT_H1_DATA_MASK                 GENMASK(3, 0)
  41
  42 #define   BME680_RHRANGE_MASK                   GENMASK(5, 4)
  43 #define BME680_REG_RES_HEAT_VAL                 0x00
  44 #define   BME680_RSERROR_MASK                   GENMASK(7, 4)
  45 #define BME680_REG_IDAC_HEAT_0                  0x50
  46 #define BME680_REG_RES_HEAT_0                   0x5A
  47 #define BME680_REG_GAS_WAIT_0                   0x64
  48 #define BME680_ADC_GAS_RES                      GENMASK(15, 6)
  49 #define BME680_AMB_TEMP                         25
  50
  51 #define BME680_REG_CTRL_GAS_1                   0x71
  52 #define   BME680_RUN_GAS_MASK                   BIT(4)
  53 #define   BME680_NB_CONV_MASK                   GENMASK(3, 0)
  54
  55 #define BME680_REG_MEAS_STAT_0                  0x1D
  56 #define   BME680_NEW_DATA_BIT                   BIT(7)
  57 #define   BME680_GAS_MEAS_BIT                   BIT(6)
  58 #define   BME680_MEAS_BIT                       BIT(5)
  59
  60 #define BME680_TEMP_NUM_BYTES                   3
  61 #define BME680_PRESS_NUM_BYTES                  3
  62 #define BME680_HUMID_NUM_BYTES                  2
  63 #define BME680_GAS_NUM_BYTES                    2
  64
  65 #define BME680_MEAS_TRIM_MASK                   GENMASK(24, 4)
  66
  67 /* Datasheet Section 1.1, Table 1 */
  68 #define BME680_STARTUP_TIME_US                  2000
  69
  70 #define BME680_NUM_CHANNELS                     4
  71 #define BME680_NUM_BULK_READ_REGS               15
  72
  73 /* Calibration Parameters */
  74 #define BME680_T2_LSB_REG       0x8A
  75 #define BME680_H2_MSB_REG       0xE1
  76 #define BME680_GH3_REG          0xEE
  77
  78 #define BME680_CALIB_RANGE_1_LEN               23
  79 #define BME680_CALIB_RANGE_2_LEN               14
  80 #define BME680_CALIB_RANGE_3_LEN               5
  81
  82 extern const struct regmap_config bme680_regmap_config;
  83
  84 int bme680_core_probe(struct device *dev, struct regmap *regmap,
  85                       const char *name);
  86
  87 #endif  /* BME680_H_ */