From 83cb40beaefaf59b224efdabecaac611b783da74 Mon Sep 17 00:00:00 2001 From: Angel Iglesias Date: Tue, 13 Sep 2022 01:46:42 +0200 Subject: [PATCH] iio: pressure: bmp280: Simplify bmp280 calibration data reading On bmp280 and bme280, the temperature and pressure calibration parameters are available on a contiguous memory region. Considering this arrangement, simplified the calibration reading function by using only one buffer to read in batch temperature and pressure registers. Signed-off-by: Angel Iglesias Link: https://lore.kernel.org/r/96d81282c95006d857f4d836d2ff3ee0740a85a0.1663025017.git.ang.iglesiasg@gmail.com Signed-off-by: Jonathan Cameron --- drivers/iio/pressure/bmp280-core.c | 58 +++++++++++++++----------------------- drivers/iio/pressure/bmp280.h | 3 ++ 2 files changed, 26 insertions(+), 35 deletions(-) diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c index 74f273b..c86dae3 100644 --- a/drivers/iio/pressure/bmp280-core.c +++ b/drivers/iio/pressure/bmp280-core.c @@ -134,8 +134,7 @@ struct bmp280_chip_info { * These enums are used for indexing into the array of compensation * parameters for BMP280. */ -enum { T1, T2, T3 }; -enum { P1, P2, P3, P4, P5, P6, P7, P8, P9 }; +enum { T1, T2, T3, P1, P2, P3, P4, P5, P6, P7, P8, P9 }; static const struct iio_chan_spec bmp280_channels[] = { { @@ -159,8 +158,7 @@ static int bmp280_read_calib(struct bmp280_data *data, struct bmp280_calib *calib, unsigned int chip) { - __le16 p_buf[BMP280_COMP_PRESS_REG_COUNT / 2]; - __le16 t_buf[BMP280_COMP_TEMP_REG_COUNT / 2]; + __le16 c_buf[BMP280_CONTIGUOUS_CALIB_REGS / 2]; struct device *dev = data->dev; unsigned int tmp; __le16 l16; @@ -168,43 +166,33 @@ static int bmp280_read_calib(struct bmp280_data *data, int ret; - /* Read temperature calibration values. */ + /* Read temperature and pressure calibration values. */ ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_TEMP_START, - t_buf, BMP280_COMP_TEMP_REG_COUNT); + c_buf, sizeof(c_buf)); if (ret < 0) { dev_err(data->dev, - "failed to read temperature calibration parameters\n"); + "failed to read temperature and pressure calibration parameters\n"); return ret; } - /* Toss the temperature calibration data into the entropy pool */ - add_device_randomness(t_buf, sizeof(t_buf)); - - calib->T1 = le16_to_cpu(t_buf[T1]); - calib->T2 = le16_to_cpu(t_buf[T2]); - calib->T3 = le16_to_cpu(t_buf[T3]); - - /* Read pressure calibration values. */ - ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_PRESS_START, - p_buf, BMP280_COMP_PRESS_REG_COUNT); - if (ret < 0) { - dev_err(data->dev, - "failed to read pressure calibration parameters\n"); - return ret; - } - - /* Toss the pressure calibration data into the entropy pool */ - add_device_randomness(p_buf, sizeof(p_buf)); - - calib->P1 = le16_to_cpu(p_buf[P1]); - calib->P2 = le16_to_cpu(p_buf[P2]); - calib->P3 = le16_to_cpu(p_buf[P3]); - calib->P4 = le16_to_cpu(p_buf[P4]); - calib->P5 = le16_to_cpu(p_buf[P5]); - calib->P6 = le16_to_cpu(p_buf[P6]); - calib->P7 = le16_to_cpu(p_buf[P7]); - calib->P8 = le16_to_cpu(p_buf[P8]); - calib->P9 = le16_to_cpu(p_buf[P9]); + /* Toss the temperature and pressure calibration data into the entropy pool */ + add_device_randomness(c_buf, sizeof(c_buf)); + + /* Parse temperature calibration values. */ + calib->T1 = le16_to_cpu(c_buf[T1]); + calib->T2 = le16_to_cpu(c_buf[T2]); + calib->T3 = le16_to_cpu(c_buf[T3]); + + /* Parse pressure calibration values. */ + calib->P1 = le16_to_cpu(c_buf[P1]); + calib->P2 = le16_to_cpu(c_buf[P2]); + calib->P3 = le16_to_cpu(c_buf[P3]); + calib->P4 = le16_to_cpu(c_buf[P4]); + calib->P5 = le16_to_cpu(c_buf[P5]); + calib->P6 = le16_to_cpu(c_buf[P6]); + calib->P7 = le16_to_cpu(c_buf[P7]); + calib->P8 = le16_to_cpu(c_buf[P8]); + calib->P9 = le16_to_cpu(c_buf[P9]); /* * Read humidity calibration values. diff --git a/drivers/iio/pressure/bmp280.h b/drivers/iio/pressure/bmp280.h index 4a50183..03a5392 100644 --- a/drivers/iio/pressure/bmp280.h +++ b/drivers/iio/pressure/bmp280.h @@ -37,6 +37,9 @@ #define BMP280_COMP_H5_MASK GENMASK(15, 4) +#define BMP280_CONTIGUOUS_CALIB_REGS (BMP280_COMP_TEMP_REG_COUNT + \ + BMP280_COMP_PRESS_REG_COUNT) + #define BMP280_FILTER_MASK GENMASK(4, 2) #define BMP280_FILTER_OFF 0 #define BMP280_FILTER_2X 1 -- 2.7.4