On Sun, Aug 25, 2024 at 09:04:16AM +0200, Christophe JAILLET wrote: > Le 23/08/2024 à 20:17, Vasileios Amoiridis a écrit : > > 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-Re5JQEeQqe8AvxtiuMwx3w@xxxxxxxxxxxxxxxx> > > --- > > drivers/iio/pressure/bmp280-core.c | 26 ++++++++++++++++++++++++++ > > drivers/iio/pressure/bmp280.h | 3 +++ > > 2 files changed, 29 insertions(+) > > > > diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c > > index c23515048081..e01c9369bd67 100644 > > --- a/drivers/iio/pressure/bmp280-core.c > > +++ b/drivers/iio/pressure/bmp280-core.c > > @@ -965,6 +965,30 @@ 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) > > + return dev_err_probe(data->dev, ret, > > + "Failed to reset device.\n"); > > + > > + usleep_range(data->start_up_time, data->start_up_time + 500); > > + > > + ret = regmap_read(data->regmap, BMP280_REG_STATUS, ®); > > + if (ret) > > + return dev_err_probe(data->dev, ret, > > + "Failed to read status register.\n"); > > + > > + if (reg & BMP280_REG_STATUS_IM_UPDATE) > > + return dev_err_probe(data->dev, ret, > > + "Failed to copy NVM contents.\n"); > > ret is 0 at this point. > Should a -E<something> be used instead? > > CJ > Hi Cristophe, Yes, actually this could be an I/O error since we were not able to copy the values back from the NVM device to the sensor. Cheers, Vasilis > > + > > + return 0; > > +} > > + > > static int bmp280_chip_config(struct bmp280_data *data) > > { > > u8 osrs = FIELD_PREP(BMP280_OSRS_TEMP_MASK, data->oversampling_temp + 1) | > > @@ -1082,6 +1106,7 @@ 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, > > }; > > @@ -1202,6 +1227,7 @@ 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 4e675401d61b..73516878d020 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 >
