diff options
Diffstat (limited to 'drivers/iio/chemical/bme680_core.c')
| -rw-r--r-- | drivers/iio/chemical/bme680_core.c | 54 |
1 files changed, 45 insertions, 9 deletions
diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c index 70c1fe4366f4..ccde4c65ff93 100644 --- a/drivers/iio/chemical/bme680_core.c +++ b/drivers/iio/chemical/bme680_core.c @@ -63,9 +63,23 @@ struct bme680_data { s32 t_fine; }; +static const struct regmap_range bme680_volatile_ranges[] = { + regmap_reg_range(BME680_REG_MEAS_STAT_0, BME680_REG_GAS_R_LSB), + regmap_reg_range(BME680_REG_STATUS, BME680_REG_STATUS), + regmap_reg_range(BME680_T2_LSB_REG, BME680_GH3_REG), +}; + +static const struct regmap_access_table bme680_volatile_table = { + .yes_ranges = bme680_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(bme680_volatile_ranges), +}; + const struct regmap_config bme680_regmap_config = { .reg_bits = 8, .val_bits = 8, + .max_register = 0xef, + .volatile_table = &bme680_volatile_table, + .cache_type = REGCACHE_RBTREE, }; EXPORT_SYMBOL(bme680_regmap_config); @@ -316,6 +330,10 @@ static s16 bme680_compensate_temp(struct bme680_data *data, s64 var1, var2, var3; s16 calc_temp; + /* If the calibration is invalid, attempt to reload it */ + if (!calib->par_t2) + bme680_read_calib(data, calib); + var1 = (adc_temp >> 3) - (calib->par_t1 << 1); var2 = (var1 * calib->par_t2) >> 11; var3 = ((var1 >> 1) * (var1 >> 1)) >> 12; @@ -583,8 +601,7 @@ static int bme680_gas_config(struct bme680_data *data) return ret; } -static int bme680_read_temp(struct bme680_data *data, - int *val, int *val2) +static int bme680_read_temp(struct bme680_data *data, int *val) { struct device *dev = regmap_get_device(data->regmap); int ret; @@ -617,10 +634,9 @@ static int bme680_read_temp(struct bme680_data *data, * compensate_press/compensate_humid to get compensated * pressure/humidity readings. */ - if (val && val2) { - *val = comp_temp; - *val2 = 100; - return IIO_VAL_FRACTIONAL; + if (val) { + *val = comp_temp * 10; /* Centidegrees to millidegrees */ + return IIO_VAL_INT; } return ret; @@ -635,7 +651,7 @@ static int bme680_read_press(struct bme680_data *data, s32 adc_press; /* Read and compensate temperature to get a reading of t_fine */ - ret = bme680_read_temp(data, NULL, NULL); + ret = bme680_read_temp(data, NULL); if (ret < 0) return ret; @@ -668,7 +684,7 @@ static int bme680_read_humid(struct bme680_data *data, u32 comp_humidity; /* Read and compensate temperature to get a reading of t_fine */ - ret = bme680_read_temp(data, NULL, NULL); + ret = bme680_read_temp(data, NULL); if (ret < 0) return ret; @@ -761,7 +777,7 @@ static int bme680_read_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_PROCESSED: switch (chan->type) { case IIO_TEMP: - return bme680_read_temp(data, val, val2); + return bme680_read_temp(data, val); case IIO_PRESSURE: return bme680_read_press(data, val, val2); case IIO_HUMIDITYRELATIVE: @@ -867,8 +883,28 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap, { struct iio_dev *indio_dev; struct bme680_data *data; + unsigned int val; int ret; + ret = regmap_write(regmap, BME680_REG_SOFT_RESET, + BME680_CMD_SOFTRESET); + if (ret < 0) { + dev_err(dev, "Failed to reset chip\n"); + return ret; + } + + ret = regmap_read(regmap, BME680_REG_CHIP_ID, &val); + if (ret < 0) { + dev_err(dev, "Error reading chip ID\n"); + return ret; + } + + if (val != BME680_CHIP_ID_VAL) { + dev_err(dev, "Wrong chip ID, got %x expected %x\n", + val, BME680_CHIP_ID_VAL); + return -ENODEV; + } + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); if (!indio_dev) return -ENOMEM; |