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For that reason we can use bulk reads as is done as well in the BME68x Sensor API [1]. The arrays that are used for reading the data out of the sensor are located inside DMA safe buffer. [1]: https://github.com/boschsensortec/BME68x_SensorAPI/blob/v4.4.8/bme68x.= c#L1769 Signed-off-by: Vasileios Amoiridis --- drivers/iio/chemical/bme680.h | 28 +-- drivers/iio/chemical/bme680_core.c | 283 ++++++++++------------------- 2 files changed, 101 insertions(+), 210 deletions(-) diff --git a/drivers/iio/chemical/bme680.h b/drivers/iio/chemical/bme680.h index 3133d624270a..5f602170a3af 100644 --- a/drivers/iio/chemical/bme680.h +++ b/drivers/iio/chemical/bme680.h @@ -39,10 +39,8 @@ #define BME680_HUM_REG_SHIFT_VAL 4 #define BME680_BIT_H1_DATA_MASK GENMASK(3, 0) =20 -#define BME680_REG_RES_HEAT_RANGE 0x02 #define BME680_RHRANGE_MASK GENMASK(5, 4) #define BME680_REG_RES_HEAT_VAL 0x00 -#define BME680_REG_RANGE_SW_ERR 0x04 #define BME680_RSERROR_MASK GENMASK(7, 4) #define BME680_REG_RES_HEAT_0 0x5A #define BME680_REG_GAS_WAIT_0 0x64 @@ -58,31 +56,13 @@ =20 /* Calibration Parameters */ #define BME680_T2_LSB_REG 0x8A -#define BME680_T3_REG 0x8C -#define BME680_P1_LSB_REG 0x8E -#define BME680_P2_LSB_REG 0x90 -#define BME680_P3_REG 0x92 -#define BME680_P4_LSB_REG 0x94 -#define BME680_P5_LSB_REG 0x96 -#define BME680_P7_REG 0x98 -#define BME680_P6_REG 0x99 -#define BME680_P8_LSB_REG 0x9C -#define BME680_P9_LSB_REG 0x9E -#define BME680_P10_REG 0xA0 -#define BME680_H2_LSB_REG 0xE2 #define BME680_H2_MSB_REG 0xE1 -#define BME680_H1_MSB_REG 0xE3 -#define BME680_H1_LSB_REG 0xE2 -#define BME680_H3_REG 0xE4 -#define BME680_H4_REG 0xE5 -#define BME680_H5_REG 0xE6 -#define BME680_H6_REG 0xE7 -#define BME680_H7_REG 0xE8 -#define BME680_T1_LSB_REG 0xE9 -#define BME680_GH2_LSB_REG 0xEB -#define BME680_GH1_REG 0xED #define BME680_GH3_REG 0xEE =20 +#define BME680_CALIB_RANGE_1_LEN 23 +#define BME680_CALIB_RANGE_2_LEN 14 +#define BME680_CALIB_RANGE_3_LEN 5 + extern const struct regmap_config bme680_regmap_config; =20 int bme680_core_probe(struct device *dev, struct regmap *regmap, diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme6= 80_core.c index 681f271f9b06..ed4cdb4d64af 100644 --- a/drivers/iio/chemical/bme680_core.c +++ b/drivers/iio/chemical/bme680_core.c @@ -19,8 +19,53 @@ #include #include =20 +#include + #include "bme680.h" =20 +/* 1st set of calibration data */ +enum { + /* Temperature calib indexes */ + T2_LSB =3D 0, + T3 =3D 2, + /* Pressure calib indexes */ + P1_LSB =3D 4, + P2_LSB =3D 6, + P3 =3D 8, + P4_LSB =3D 10, + P5_LSB =3D 12, + P7 =3D 14, + P6 =3D 15, + P8_LSB =3D 18, + P9_LSB =3D 20, + P10 =3D 22, +}; + +/* 2nd set of calibration data */ +enum { + /* Humidity calib indexes */ + H2_MSB =3D 0, + H1_LSB =3D 1, + H3 =3D 3, + H4 =3D 4, + H5 =3D 5, + H6 =3D 6, + H7 =3D 7, + /* Stray T1 calib index */ + T1_LSB =3D 8, + /* Gas heater calib indexes */ + GH2_LSB =3D 10, + GH1 =3D 12, + GH3 =3D 13, +}; + +/* 3rd set of calibration data */ +enum { + RES_HEAT_VAL =3D 0, + RES_HEAT_RANGE =3D 2, + RANGE_SW_ERR =3D 4, +}; + struct bme680_calib { u16 par_t1; s16 par_t2; @@ -64,6 +109,16 @@ struct bme680_data { * and humidity compensation calculations. */ s32 t_fine; + + /* + * DMA (thus cache coherency maintenance) may require the + * transfer buffers to live in their own cache lines. + */ + union { + u8 bme680_cal_buf_1[BME680_CALIB_RANGE_1_LEN]; + u8 bme680_cal_buf_2[BME680_CALIB_RANGE_2_LEN]; + u8 bme680_cal_buf_3[BME680_CALIB_RANGE_3_LEN]; + } __aligned(IIO_DMA_MINALIGN); }; =20 static const struct regmap_range bme680_volatile_ranges[] =3D { @@ -112,217 +167,73 @@ static int bme680_read_calib(struct bme680_data *dat= a, struct bme680_calib *calib) { struct device *dev =3D regmap_get_device(data->regmap); - unsigned int tmp, tmp_msb, tmp_lsb; + unsigned int tmp_msb, tmp_lsb; int ret; - __le16 buf; - - /* Temperature related coefficients */ - ret =3D regmap_bulk_read(data->regmap, BME680_T1_LSB_REG, - &buf, sizeof(buf)); - if (ret < 0) { - dev_err(dev, "failed to read BME680_T1_LSB_REG\n"); - return ret; - } - calib->par_t1 =3D le16_to_cpu(buf); =20 ret =3D regmap_bulk_read(data->regmap, BME680_T2_LSB_REG, - &buf, sizeof(buf)); + &data->bme680_cal_buf_1[0], + sizeof(data->bme680_cal_buf_1)); if (ret < 0) { - dev_err(dev, "failed to read BME680_T2_LSB_REG\n"); + dev_err(dev, "failed to read 1st set of calib data;\n"); return ret; } - calib->par_t2 =3D le16_to_cpu(buf); =20 - ret =3D regmap_read(data->regmap, BME680_T3_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_T3_REG\n"); - return ret; - } - calib->par_t3 =3D tmp; + calib->par_t2 =3D get_unaligned_le16(&data->bme680_cal_buf_1[T2_LSB]); + calib->par_t3 =3D data->bme680_cal_buf_1[T3]; + calib->par_p1 =3D get_unaligned_le16(&data->bme680_cal_buf_1[P1_LSB]); + calib->par_p2 =3D get_unaligned_le16(&data->bme680_cal_buf_1[P2_LSB]); + calib->par_p3 =3D data->bme680_cal_buf_1[P3]; + calib->par_p4 =3D get_unaligned_le16(&data->bme680_cal_buf_1[P4_LSB]); + calib->par_p5 =3D get_unaligned_le16(&data->bme680_cal_buf_1[P5_LSB]); + calib->par_p7 =3D data->bme680_cal_buf_1[P7]; + calib->par_p6 =3D data->bme680_cal_buf_1[P6]; + calib->par_p8 =3D get_unaligned_le16(&data->bme680_cal_buf_1[P8_LSB]); + calib->par_p9 =3D get_unaligned_le16(&data->bme680_cal_buf_1[P9_LSB]); + calib->par_p10 =3D data->bme680_cal_buf_1[P10]; =20 - /* Pressure related coefficients */ - ret =3D regmap_bulk_read(data->regmap, BME680_P1_LSB_REG, - &buf, sizeof(buf)); + ret =3D regmap_bulk_read(data->regmap, BME680_H2_MSB_REG, + &data->bme680_cal_buf_2[0], + sizeof(data->bme680_cal_buf_2)); if (ret < 0) { - dev_err(dev, "failed to read BME680_P1_LSB_REG\n"); + dev_err(dev, "failed to read 2nd set of calib data;\n"); return ret; } - calib->par_p1 =3D le16_to_cpu(buf); =20 - ret =3D regmap_bulk_read(data->regmap, BME680_P2_LSB_REG, - &buf, sizeof(buf)); - if (ret < 0) { - dev_err(dev, "failed to read BME680_P2_LSB_REG\n"); - return ret; - } - calib->par_p2 =3D le16_to_cpu(buf); - - ret =3D regmap_read(data->regmap, BME680_P3_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_P3_REG\n"); - return ret; - } - calib->par_p3 =3D tmp; - - ret =3D regmap_bulk_read(data->regmap, BME680_P4_LSB_REG, - &buf, sizeof(buf)); - if (ret < 0) { - dev_err(dev, "failed to read BME680_P4_LSB_REG\n"); - return ret; - } - calib->par_p4 =3D le16_to_cpu(buf); - - ret =3D regmap_bulk_read(data->regmap, BME680_P5_LSB_REG, - &buf, sizeof(buf)); - if (ret < 0) { - dev_err(dev, "failed to read BME680_P5_LSB_REG\n"); - return ret; - } - calib->par_p5 =3D le16_to_cpu(buf); - - ret =3D regmap_read(data->regmap, BME680_P6_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_P6_REG\n"); - return ret; - } - calib->par_p6 =3D tmp; - - ret =3D regmap_read(data->regmap, BME680_P7_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_P7_REG\n"); - return ret; - } - calib->par_p7 =3D tmp; - - ret =3D regmap_bulk_read(data->regmap, BME680_P8_LSB_REG, - &buf, sizeof(buf)); - if (ret < 0) { - dev_err(dev, "failed to read BME680_P8_LSB_REG\n"); - return ret; - } - calib->par_p8 =3D le16_to_cpu(buf); - - ret =3D regmap_bulk_read(data->regmap, BME680_P9_LSB_REG, - &buf, sizeof(buf)); - if (ret < 0) { - dev_err(dev, "failed to read BME680_P9_LSB_REG\n"); - return ret; - } - calib->par_p9 =3D le16_to_cpu(buf); - - ret =3D regmap_read(data->regmap, BME680_P10_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_P10_REG\n"); - return ret; - } - calib->par_p10 =3D tmp; - - /* Humidity related coefficients */ - ret =3D regmap_read(data->regmap, BME680_H1_MSB_REG, &tmp_msb); - if (ret < 0) { - dev_err(dev, "failed to read BME680_H1_MSB_REG\n"); - return ret; - } - ret =3D regmap_read(data->regmap, BME680_H1_LSB_REG, &tmp_lsb); - if (ret < 0) { - dev_err(dev, "failed to read BME680_H1_LSB_REG\n"); - return ret; - } + tmp_lsb =3D data->bme680_cal_buf_2[H1_LSB]; + tmp_msb =3D data->bme680_cal_buf_2[H1_LSB + 1]; calib->par_h1 =3D (tmp_msb << BME680_HUM_REG_SHIFT_VAL) | (tmp_lsb & BME680_BIT_H1_DATA_MASK); =20 - ret =3D regmap_read(data->regmap, BME680_H2_MSB_REG, &tmp_msb); - if (ret < 0) { - dev_err(dev, "failed to read BME680_H2_MSB_REG\n"); - return ret; - } - ret =3D regmap_read(data->regmap, BME680_H2_LSB_REG, &tmp_lsb); - if (ret < 0) { - dev_err(dev, "failed to read BME680_H2_LSB_REG\n"); - return ret; - } + tmp_msb =3D data->bme680_cal_buf_2[H2_MSB]; + tmp_lsb =3D data->bme680_cal_buf_2[H2_MSB + 1]; calib->par_h2 =3D (tmp_msb << BME680_HUM_REG_SHIFT_VAL) | (tmp_lsb >> BME680_HUM_REG_SHIFT_VAL); =20 - ret =3D regmap_read(data->regmap, BME680_H3_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_H3_REG\n"); - return ret; - } - calib->par_h3 =3D tmp; - - ret =3D regmap_read(data->regmap, BME680_H4_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_H4_REG\n"); - return ret; - } - calib->par_h4 =3D tmp; - - ret =3D regmap_read(data->regmap, BME680_H5_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_H5_REG\n"); - return ret; - } - calib->par_h5 =3D tmp; - - ret =3D regmap_read(data->regmap, BME680_H6_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_H6_REG\n"); - return ret; - } - calib->par_h6 =3D tmp; + calib->par_h3 =3D data->bme680_cal_buf_2[H3]; + calib->par_h4 =3D data->bme680_cal_buf_2[H4]; + calib->par_h5 =3D data->bme680_cal_buf_2[H5]; + calib->par_h6 =3D data->bme680_cal_buf_2[H6]; + calib->par_h7 =3D data->bme680_cal_buf_2[H7]; + calib->par_t1 =3D get_unaligned_le16(&data->bme680_cal_buf_2[T1_LSB]); + calib->par_gh2 =3D get_unaligned_le16(&data->bme680_cal_buf_2[GH2_LSB]); + calib->par_gh1 =3D data->bme680_cal_buf_2[GH1]; + calib->par_gh3 =3D data->bme680_cal_buf_2[GH3]; =20 - ret =3D regmap_read(data->regmap, BME680_H7_REG, &tmp); + ret =3D regmap_bulk_read(data->regmap, BME680_REG_RES_HEAT_VAL, + &data->bme680_cal_buf_3[0], + sizeof(data->bme680_cal_buf_3)); if (ret < 0) { - dev_err(dev, "failed to read BME680_H7_REG\n"); + dev_err(dev, "failed to read 3rd set of calib data;\n"); return ret; } - calib->par_h7 =3D tmp; =20 - /* Gas heater related coefficients */ - ret =3D regmap_read(data->regmap, BME680_GH1_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_GH1_REG\n"); - return ret; - } - calib->par_gh1 =3D tmp; + calib->res_heat_val =3D data->bme680_cal_buf_3[RES_HEAT_VAL]; =20 - ret =3D regmap_bulk_read(data->regmap, BME680_GH2_LSB_REG, - &buf, sizeof(buf)); - if (ret < 0) { - dev_err(dev, "failed to read BME680_GH2_LSB_REG\n"); - return ret; - } - calib->par_gh2 =3D le16_to_cpu(buf); + calib->res_heat_range =3D FIELD_GET(BME680_RHRANGE_MASK, + data->bme680_cal_buf_3[RES_HEAT_RANGE]); =20 - ret =3D regmap_read(data->regmap, BME680_GH3_REG, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read BME680_GH3_REG\n"); - return ret; - } - calib->par_gh3 =3D tmp; - - /* Other coefficients */ - ret =3D regmap_read(data->regmap, BME680_REG_RES_HEAT_RANGE, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read resistance heat range\n"); - return ret; - } - calib->res_heat_range =3D FIELD_GET(BME680_RHRANGE_MASK, tmp); - - ret =3D regmap_read(data->regmap, BME680_REG_RES_HEAT_VAL, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read resistance heat value\n"); - return ret; - } - calib->res_heat_val =3D tmp; - - ret =3D regmap_read(data->regmap, BME680_REG_RANGE_SW_ERR, &tmp); - if (ret < 0) { - dev_err(dev, "failed to read range software error\n"); - return ret; - } - calib->range_sw_err =3D FIELD_GET(BME680_RSERROR_MASK, tmp); + calib->range_sw_err =3D FIELD_GET(BME680_RSERROR_MASK, + data->bme680_cal_buf_3[RANGE_SW_ERR]); =20 return 0; } --=20 2.25.1