linux-kernel - Re: [PATCH v2 07/13] iio: chemical: bme680: generalize read

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Message-ID: <20241027101157.79969c0b@jic23-huawei>
Date: Sun, 27 Oct 2024 10:11:57 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Vasileios Amoiridis <vassilisamir@...il.com>
Cc: lars@...afoo.de, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, andriy.shevchenko@...ux.intel.com,
 anshulusr@...il.com, gustavograzs@...il.com, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 07/13] iio: chemical: bme680: generalize read_*()
 functions

On Mon, 21 Oct 2024 21:53:10 +0200
Vasileios Amoiridis <vassilisamir@...il.com> wrote:

> Remove the IIO specific scaling measurement units from the read functions
> and add them inside the ->read_raw() function to keep the read_*() generic.
> This way they can be used in other parts of the driver.
Applied.
> 
> Signed-off-by: Vasileios Amoiridis <vassilisamir@...il.com>
> ---
>  drivers/iio/chemical/bme680_core.c | 68 ++++++++++++++++++------------
>  1 file changed, 40 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
> index 2ad427f5deb4..c79ba6d1ece8 100644
> --- a/drivers/iio/chemical/bme680_core.c
> +++ b/drivers/iio/chemical/bme680_core.c
> @@ -644,23 +644,20 @@ static int bme680_gas_config(struct bme680_data *data)
>  	return ret;
>  }
>  
> -static int bme680_read_temp(struct bme680_data *data, int *val)
> +static int bme680_read_temp(struct bme680_data *data, s16 *comp_temp)
>  {
>  	int ret;
>  	u32 adc_temp;
> -	s16 comp_temp;
>  
>  	ret = bme680_read_temp_adc(data, &adc_temp);
>  	if (ret)
>  		return ret;
>  
> -	comp_temp = bme680_compensate_temp(data, adc_temp);
> -	*val = comp_temp * 10; /* Centidegrees to millidegrees */
> -	return IIO_VAL_INT;
> +	*comp_temp = bme680_compensate_temp(data, adc_temp);
> +	return 0;
>  }
>  
> -static int bme680_read_press(struct bme680_data *data,
> -			     int *val, int *val2)
> +static int bme680_read_press(struct bme680_data *data, u32 *comp_press)
>  {
>  	int ret;
>  	u32 adc_press;
> @@ -674,16 +671,14 @@ static int bme680_read_press(struct bme680_data *data,
>  	if (ret)
>  		return ret;
>  
> -	*val = bme680_compensate_press(data, adc_press, t_fine);
> -	*val2 = 1000;
> -	return IIO_VAL_FRACTIONAL;
> +	*comp_press = bme680_compensate_press(data, adc_press, t_fine);
> +	return 0;
>  }
>  
> -static int bme680_read_humid(struct bme680_data *data,
> -			     int *val, int *val2)
> +static int bme680_read_humid(struct bme680_data *data, u32 *comp_humidity)
>  {
>  	int ret;
> -	u32 adc_humidity, comp_humidity;
> +	u32 adc_humidity;
>  	s32 t_fine;
>  
>  	ret = bme680_get_t_fine(data, &t_fine);
> @@ -694,15 +689,11 @@ static int bme680_read_humid(struct bme680_data *data,
>  	if (ret)
>  		return ret;
>  
> -	comp_humidity = bme680_compensate_humid(data, adc_humidity, t_fine);
> -
> -	*val = comp_humidity;
> -	*val2 = 1000;
> -	return IIO_VAL_FRACTIONAL;
> +	*comp_humidity = bme680_compensate_humid(data, adc_humidity, t_fine);
> +	return 0;
>  }
>  
> -static int bme680_read_gas(struct bme680_data *data,
> -			   int *val)
> +static int bme680_read_gas(struct bme680_data *data, int *comp_gas_res)
>  {
>  	struct device *dev = regmap_get_device(data->regmap);
>  	int ret;
> @@ -737,9 +728,8 @@ static int bme680_read_gas(struct bme680_data *data,
>  	}
>  
>  	gas_range = FIELD_GET(BME680_GAS_RANGE_MASK, gas_regs_val);
> -
> -	*val = bme680_compensate_gas(data, adc_gas_res, gas_range);
> -	return IIO_VAL_INT;
> +	*comp_gas_res = bme680_compensate_gas(data, adc_gas_res, gas_range);
> +	return 0;
>  }
>  
>  static int bme680_read_raw(struct iio_dev *indio_dev,
> @@ -747,7 +737,7 @@ static int bme680_read_raw(struct iio_dev *indio_dev,
>  			   int *val, int *val2, long mask)
>  {
>  	struct bme680_data *data = iio_priv(indio_dev);
> -	int ret;
> +	int chan_val, ret;
>  
>  	guard(mutex)(&data->lock);
>  
> @@ -763,13 +753,35 @@ static int bme680_read_raw(struct iio_dev *indio_dev,
>  	case IIO_CHAN_INFO_PROCESSED:
>  		switch (chan->type) {
>  		case IIO_TEMP:
> -			return bme680_read_temp(data, val);
> +			ret = bme680_read_temp(data, (s16 *)&chan_val);
> +			if (ret)
> +				return ret;
> +
> +			*val = chan_val * 10;
> +			return IIO_VAL_INT;
>  		case IIO_PRESSURE:
> -			return bme680_read_press(data, val, val2);
> +			ret = bme680_read_press(data, &chan_val);
> +			if (ret)
> +				return ret;
> +
> +			*val = chan_val;
> +			*val2 = 1000;
> +			return IIO_VAL_FRACTIONAL;
>  		case IIO_HUMIDITYRELATIVE:
> -			return bme680_read_humid(data, val, val2);
> +			ret = bme680_read_humid(data, &chan_val);
> +			if (ret)
> +				return ret;
> +
> +			*val = chan_val;
> +			*val2 = 1000;
> +			return IIO_VAL_FRACTIONAL;
>  		case IIO_RESISTANCE:
> -			return bme680_read_gas(data, val);
> +			ret = bme680_read_gas(data, &chan_val);
> +			if (ret)
> +				return ret;
> +
> +			*val = chan_val;
> +			return IIO_VAL_INT;
>  		default:
>  			return -EINVAL;
>  		}