The BM(P/E)28x devices have an option for soft reset which is also recommended by the Bosch Sensortech BME2 Sensor API to be used before the initial configuration of the device. Link: https://github.com/boschsensortec/BME280_SensorAPI/blob/bme280_v3.5.1/bme280.c#L429 Signed-off-by: Vasileios Amoiridis <vassilisamir@xxxxxxxxx> --- drivers/iio/pressure/bmp280-core.c | 28 ++++++++++++++++++++++++++++ drivers/iio/pressure/bmp280.h | 3 +++ 2 files changed, 31 insertions(+) diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c index 9c32266403bd..caee586b2268 100644 --- a/drivers/iio/pressure/bmp280-core.c +++ b/drivers/iio/pressure/bmp280-core.c @@ -958,6 +958,32 @@ static const unsigned long bme280_avail_scan_masks[] = { 0 }; +static int bmp280_preinit(struct bmp280_data *data) +{ + unsigned int reg; + int ret; + + ret = regmap_write(data->regmap, BMP280_REG_RESET, BMP280_RST_SOFT_CMD); + if (ret) { + dev_err(data->dev, "Failed to reset device.\n"); + return ret; + } + + usleep_range(data->start_up_time, data->start_up_time + 500); + + ret = regmap_read(data->regmap, BMP280_REG_STATUS, ®); + if (ret) { + dev_err(data->dev, "Failed to read status register.\n"); + return ret; + } + if (reg & BMP280_REG_STATUS_IM_UPDATE) { + dev_err(data->dev, "Failed to copy NVM contents.\n"); + return ret; + } + + return 0; +} + static int bmp280_chip_config(struct bmp280_data *data) { u8 osrs = FIELD_PREP(BMP280_OSRS_TEMP_MASK, data->oversampling_temp + 1) | @@ -1074,6 +1100,7 @@ const struct bmp280_chip_info bmp280_chip_info = { .read_temp = bmp280_read_temp, .read_press = bmp280_read_press, .read_calib = bmp280_read_calib, + .preinit = bmp280_preinit, .trigger_handler = bmp280_trigger_handler, }; @@ -1191,6 +1218,7 @@ const struct bmp280_chip_info bme280_chip_info = { .read_press = bmp280_read_press, .read_humid = bme280_read_humid, .read_calib = bme280_read_calib, + .preinit = bmp280_preinit, .trigger_handler = bme280_trigger_handler, }; diff --git a/drivers/iio/pressure/bmp280.h b/drivers/iio/pressure/bmp280.h index 56c01f224728..02647454bd02 100644 --- a/drivers/iio/pressure/bmp280.h +++ b/drivers/iio/pressure/bmp280.h @@ -205,6 +205,9 @@ #define BMP280_REG_CONFIG 0xF5 #define BMP280_REG_CTRL_MEAS 0xF4 #define BMP280_REG_STATUS 0xF3 +#define BMP280_REG_STATUS_IM_UPDATE BIT(0) +#define BMP280_REG_RESET 0xE0 +#define BMP280_RST_SOFT_CMD 0xB6 #define BMP280_REG_COMP_TEMP_START 0x88 #define BMP280_COMP_TEMP_REG_COUNT 6 -- 2.25.1
