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[PATCH v2 2/7] iio: pressure: bmp280: Add support for bmp280 soft reset

Vasileios Amoiridis posted 7 patches 1 year, 6 months ago
There is a newer version of this series
[PATCH v2 2/7] iio: pressure: bmp280: Add support for bmp280 soft reset
Posted by Vasileios Amoiridis 1 year, 6 months ago 
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>
---
 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 d5e5eb22667a..acbc33aacc09 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -963,6 +963,32 @@ 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, &reg);
+	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) |
@@ -1079,6 +1105,7 @@ 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,
 };
@@ -1196,6 +1223,7 @@ 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 9bea0b84d2f4..a9f220c1f77a 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
Re: [PATCH v2 2/7] iio: pressure: bmp280: Add support for bmp280 soft reset
Posted by Jonathan Cameron 1 year, 6 months ago 
On Fri, 26 Jul 2024 01:10:34 +0200
Vasileios Amoiridis <vassilisamir@gmail.com> wrote:

> 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>
Trivial passing comment seeing as you are going do be doing a v3 anyway.

Jonathan

> ---
>  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 d5e5eb22667a..acbc33aacc09 100644
> --- a/drivers/iio/pressure/bmp280-core.c
> +++ b/drivers/iio/pressure/bmp280-core.c
> @@ -963,6 +963,32 @@ 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;
Is this only ever called from probe?

If so, return dev_err_probe() which will save a few lines of code.

> +	}
> +
> +	usleep_range(data->start_up_time, data->start_up_time + 500);
> +
> +	ret = regmap_read(data->regmap, BMP280_REG_STATUS, &reg);
> +	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) |
> @@ -1079,6 +1105,7 @@ 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,
>  };
> @@ -1196,6 +1223,7 @@ 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 9bea0b84d2f4..a9f220c1f77a 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
Re: [PATCH v2 2/7] iio: pressure: bmp280: Add support for bmp280 soft reset
Posted by Vasileios Amoiridis 1 year, 5 months ago 
On Sun, Jul 28, 2024 at 04:49:01PM +0100, Jonathan Cameron wrote:
> On Fri, 26 Jul 2024 01:10:34 +0200
> Vasileios Amoiridis <vassilisamir@gmail.com> wrote:
> 
> > 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>
> Trivial passing comment seeing as you are going do be doing a v3 anyway.
> 
> Jonathan
> 
> > ---
> >  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 d5e5eb22667a..acbc33aacc09 100644
> > --- a/drivers/iio/pressure/bmp280-core.c
> > +++ b/drivers/iio/pressure/bmp280-core.c
> > @@ -963,6 +963,32 @@ 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;
> Is this only ever called from probe?
> 
> If so, return dev_err_probe() which will save a few lines of code.
> 

Hi Jonathan,

Indeed, this is being called only from probe so I could change that as you
proposed!

Cheers,
Vasilis

> > +	}
> > +
> > +	usleep_range(data->start_up_time, data->start_up_time + 500);
> > +
> > +	ret = regmap_read(data->regmap, BMP280_REG_STATUS, &reg);
> > +	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) |
> > @@ -1079,6 +1105,7 @@ 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,
> >  };
> > @@ -1196,6 +1223,7 @@ 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 9bea0b84d2f4..a9f220c1f77a 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
>

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