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
+
+ 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
