mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-10 20:02:10 -04:00
Code Issues Packages Projects Releases Wiki Activity

iio: pressure: bmp280: Add support for bmp280 soft reset

Browse Source 
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@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20240902184222.24874-3-vassilisamir@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Vasileios Amoiridis
2024-09-02 20:42:17 +02:00
committed by Jonathan Cameron
parent 61809f1861
commit 1a8a87879e
2 changed files with 32 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/iio/pressure/bmp280-core.c
View File

@@ -964,6 +964,33 @@ static const unsigned long bme280_avail_scan_masks[] = {
0
};
static int bmp280_preinit(struct bmp280_data *data)
{
struct device *dev = data->dev;
unsigned int reg;
int ret;
ret = regmap_write(data->regmap, BMP280_REG_RESET, BMP280_RST_SOFT_CMD);
if (ret)
return dev_err_probe(dev, ret, "Failed to reset device.\n");
/*
* According to the datasheet in Chapter 1: Specification, Table 2,
* after resetting, the device uses the complete power-on sequence so
* it needs to wait for the defined start-up time.
*/
fsleep(data->start_up_time);
ret = regmap_read(data->regmap, BMP280_REG_STATUS, &reg);
if (ret)
return dev_err_probe(dev, ret, "Failed to read status register.\n");
if (reg & BMP280_REG_STATUS_IM_UPDATE)
return dev_err_probe(dev, -EIO, "Failed to copy NVM contents.\n");
return 0;
}
static int bmp280_chip_config(struct bmp280_data *data)
{
u8 osrs = FIELD_PREP(BMP280_OSRS_TEMP_MASK, data->oversampling_temp + 1) |
@@ -1080,6 +1107,7 @@ 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,
};
@@ -1197,6 +1225,7 @@ 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,
};

3
drivers/iio/pressure/bmp280.h
View File

@@ -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