Re: [PATCH v8 1/3] iio: pressure: bmp280: Generalize read_*() functions

From: Vasileios Amoiridis
Date: Wed Jun 26 2024 - 09:39:47 EST

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On Sun, Jun 23, 2024 at 11:26:23PM -0500, Adam Rizkalla wrote:
> On Sat, Jun 22, 2024 at 02:19:18PM +0200, Vasileios Amoiridis wrote:
> > On Sat, Jun 22, 2024 at 10:28:26AM +0100, Jonathan Cameron wrote:
> > > On Tue, 18 Jun 2024 01:05:38 +0200
> > > Vasileios Amoiridis <vassilisamir@xxxxxxxxx> wrote:
> > >
> > > > Add the coefficients for the IIO standard units and the IIO value
> > > > inside the chip_info structure.
> > > >
> > > > Move the calculations for the IIO unit compatibility from inside the
> > > > read_{temp,press,humid}() functions and move them to the general
> > > > read_raw() function.
> > > >
> > > > In this way, all the data for the calculation of the value are
> > > > located in the chip_info structure of the respective sensor.
> > > >
> > > > Signed-off-by: Vasileios Amoiridis <vassilisamir@xxxxxxxxx>
> > > Does this incorporate the fix? I'm a little confused looking at
> > > what is visible here, so I'd like Adam to take a look.
> > >
> > > Btw, you missed cc'ing Adam.
> > >
> >
> > Ah, I only used the output of get_maintainer...
> >
> > > > ---
> > > > drivers/iio/pressure/bmp280-core.c | 167 +++++++++++++++++------------
> > > > drivers/iio/pressure/bmp280.h | 13 ++-
> > > > 2 files changed, 107 insertions(+), 73 deletions(-)
> > > >
> > > > diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
> > > > index 50d71ad83f37..27c00af060fa 100644
> > > > --- a/drivers/iio/pressure/bmp280-core.c
> > > > +++ b/drivers/iio/pressure/bmp280-core.c
> > > > @@ -445,10 +445,8 @@ static u32 bmp280_compensate_press(struct bmp280_data *data,
> > > > return (u32)p;
> > > > }
> > > >
> > > > -static int bmp280_read_temp(struct bmp280_data *data,
> > > > - int *val, int *val2)
> > > > +static int bmp280_read_temp(struct bmp280_data *data, s32 *comp_temp)
> > > > {
> > > > - s32 comp_temp;
> > > > u32 adc_temp;
> > > > int ret;
> > > >
> > > > @@ -456,16 +454,15 @@ static int bmp280_read_temp(struct bmp280_data *data,
> > > > if (ret)
> > > > return ret;
> > > >
> > > > - comp_temp = bmp280_compensate_temp(data, adc_temp);
> > > > + *comp_temp = bmp280_compensate_temp(data, adc_temp);
> > > >
> > > > - *val = comp_temp * 10;
> > > > - return IIO_VAL_INT;
> > > > + return 0;
> > > > }
> > > >
> > > > -static int bmp280_read_press(struct bmp280_data *data,
> > > > - int *val, int *val2)
> > > > +static int bmp280_read_press(struct bmp280_data *data, u32 *comp_press)
> > > > {
> > > > - u32 comp_press, adc_press, t_fine;
> > > > + u32 adc_press;
> > > > + s32 t_fine;
> > > > int ret;
> > > >
> > > > ret = bmp280_get_t_fine(data, &t_fine);
> > > > @@ -476,17 +473,13 @@ static int bmp280_read_press(struct bmp280_data *data,
> > > > if (ret)
> > > > return ret;
> > > >
> > > > - comp_press = bmp280_compensate_press(data, adc_press, t_fine);
> > > > -
> > > > - *val = comp_press;
> > > > - *val2 = 256000;
> > > > + *comp_press = bmp280_compensate_press(data, adc_press, t_fine);
> > > >
> > > > - return IIO_VAL_FRACTIONAL;
> > > > + return 0;
> > > > }
> > > >
> > > > -static int bme280_read_humid(struct bmp280_data *data, int *val, int *val2)
> > > > +static int bme280_read_humid(struct bmp280_data *data, u32 *comp_humidity)
> > > > {
> > > > - u32 comp_humidity;
> > > > u16 adc_humidity;
> > > > s32 t_fine;
> > > > int ret;
> > > > @@ -499,11 +492,9 @@ static int bme280_read_humid(struct bmp280_data *data, int *val, int *val2)
> > > > if (ret)
> > > > return ret;
> > > >
> > > > - comp_humidity = bme280_compensate_humidity(data, adc_humidity, t_fine);
> > > > -
> > > > - *val = comp_humidity * 1000 / 1024;
> > > > + *comp_humidity = bme280_compensate_humidity(data, adc_humidity, t_fine);
> > > >
> > > > - return IIO_VAL_INT;
> > > > + return 0;
> > > > }
> > > >
> > > > static int bmp280_read_raw_impl(struct iio_dev *indio_dev,
> > > > @@ -511,6 +502,8 @@ static int bmp280_read_raw_impl(struct iio_dev *indio_dev,
> > > > int *val, int *val2, long mask)
> > > > {
> > > > struct bmp280_data *data = iio_priv(indio_dev);
> > > > + int chan_value;
> > > > + int ret;
> > > >
> > > > guard(mutex)(&data->lock);
> > > >
> >
> > ...
> >
> > > > @@ -518,11 +511,29 @@ static int bmp280_read_raw_impl(struct iio_dev *indio_dev,
> > > > case IIO_CHAN_INFO_PROCESSED:
> > > > switch (chan->type) {
> > > > case IIO_HUMIDITYRELATIVE:
> > > > - return data->chip_info->read_humid(data, val, val2);
> > > > + ret = data->chip_info->read_humid(data, &chan_value);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + *val = data->chip_info->humid_coeffs[0] * chan_value;
> > > > + *val2 = data->chip_info->humid_coeffs[1];
> > > > + return data->chip_info->humid_coeffs_type;
> > > > case IIO_PRESSURE:
> > > > - return data->chip_info->read_press(data, val, val2);
> > > > + ret = data->chip_info->read_press(data, &chan_value);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + *val = data->chip_info->press_coeffs[0] * chan_value;
> > > > + *val2 = data->chip_info->press_coeffs[1];
> > > > + return data->chip_info->press_coeffs_type;
> > > > case IIO_TEMP:
> > > > - return data->chip_info->read_temp(data, val, val2);
> > > > + ret = data->chip_info->read_temp(data, &chan_value);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + *val = data->chip_info->temp_coeffs[0] * (s64)chan_value;
> >
> > This is the first difference with the previous version where I incorporated
> > the typecasting to (s64).
> >
> > > > + *val2 = data->chip_info->temp_coeffs[1];
> > > > + return data->chip_info->temp_coeffs_type;
> > > > default:
> > > > return -EINVAL;
> > > > }
> > > > @@ -822,6 +833,8 @@ static int bmp280_chip_config(struct bmp280_data *data)
> > > >
> > > > static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
> > > > static const u8 bmp280_chip_ids[] = { BMP280_CHIP_ID };
> > > > +static const int bmp280_temp_coeffs[] = { 10, 1 };
> > > > +static const int bmp280_press_coeffs[] = { 1, 256000 };
> > > >
> > > > const struct bmp280_chip_info bmp280_chip_info = {
> > > > .id_reg = BMP280_REG_ID,
> > > > @@ -850,6 +863,11 @@ const struct bmp280_chip_info bmp280_chip_info = {
> > > > .num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
> > > > .oversampling_press_default = BMP280_OSRS_PRESS_16X - 1,
> > > >
> > > > + .temp_coeffs = bmp280_temp_coeffs,
> > > > + .temp_coeffs_type = IIO_VAL_FRACTIONAL,
> > > > + .press_coeffs = bmp280_press_coeffs,
> > > > + .press_coeffs_type = IIO_VAL_FRACTIONAL,
> > > > +
> > > > .chip_config = bmp280_chip_config,
> > > > .read_temp = bmp280_read_temp,
> > > > .read_press = bmp280_read_press,
> > > > @@ -877,6 +895,7 @@ static int bme280_chip_config(struct bmp280_data *data)
> > > > }
> > > >
> > > > static const u8 bme280_chip_ids[] = { BME280_CHIP_ID };
> > > > +static const int bme280_humid_coeffs[] = { 1000, 1024 };
> > > >
> > > > const struct bmp280_chip_info bme280_chip_info = {
> > > > .id_reg = BMP280_REG_ID,
> > > > @@ -899,6 +918,13 @@ const struct bmp280_chip_info bme280_chip_info = {
> > > > .num_oversampling_humid_avail = ARRAY_SIZE(bmp280_oversampling_avail),
> > > > .oversampling_humid_default = BME280_OSRS_HUMIDITY_16X - 1,
> > > >
> > > > + .temp_coeffs = bmp280_temp_coeffs,
> > > > + .temp_coeffs_type = IIO_VAL_FRACTIONAL,
> > > > + .press_coeffs = bmp280_press_coeffs,
> > > > + .press_coeffs_type = IIO_VAL_FRACTIONAL,
> > > > + .humid_coeffs = bme280_humid_coeffs,
> > > > + .humid_coeffs_type = IIO_VAL_FRACTIONAL,
> > > > +
> > > > .chip_config = bme280_chip_config,
> > > > .read_temp = bmp280_read_temp,
> > > > .read_press = bmp280_read_press,
> > > > @@ -1091,9 +1117,8 @@ static u32 bmp380_compensate_press(struct bmp280_data *data,
> > > > return comp_press;
> > > > }
> > > >
> > > > -static int bmp380_read_temp(struct bmp280_data *data, int *val, int *val2)
> > > > +static int bmp380_read_temp(struct bmp280_data *data, s32 *comp_temp)
> > > > {
> > > > - s32 comp_temp;
> > > > u32 adc_temp;
> > > > int ret;
> > > >
> > > > @@ -1101,15 +1126,14 @@ static int bmp380_read_temp(struct bmp280_data *data, int *val, int *val2)
> > > > if (ret)
> > > > return ret;
> > > >
> > > > - comp_temp = bmp380_compensate_temp(data, adc_temp);
> > > > + *comp_temp = bmp380_compensate_temp(data, adc_temp);
> > > >
> > > > - *val = comp_temp * 10;
> > > > - return IIO_VAL_INT;
> > > > + return 0;
> > > > }
> > > >
> > > > -static int bmp380_read_press(struct bmp280_data *data, int *val, int *val2)
> > > > +static int bmp380_read_press(struct bmp280_data *data, u32 *comp_press)
> > > > {
> > > > - u32 adc_press, comp_press, t_fine;
> > > > + u32 adc_press, t_fine;
> > > > int ret;
> > > >
> > > > ret = bmp380_get_t_fine(data, &t_fine);
> > > > @@ -1120,12 +1144,9 @@ static int bmp380_read_press(struct bmp280_data *data, int *val, int *val2)
> > > > if (ret)
> > > > return ret;
> > > >
> > > > - comp_press = bmp380_compensate_press(data, adc_press, t_fine);
> > > > -
> > > > - *val = comp_press;
> > > > - *val2 = 100000;
> > > > + *comp_press = bmp380_compensate_press(data, adc_press, t_fine);
> > > >
> > > > - return IIO_VAL_FRACTIONAL;
> > > > + return 0;
> > > > }
> > > >
> > > > static int bmp380_read_calib(struct bmp280_data *data)
> > > > @@ -1296,6 +1317,8 @@ static int bmp380_chip_config(struct bmp280_data *data)
> > > > static const int bmp380_oversampling_avail[] = { 1, 2, 4, 8, 16, 32 };
> > > > static const int bmp380_iir_filter_coeffs_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128};
> > > > static const u8 bmp380_chip_ids[] = { BMP380_CHIP_ID, BMP390_CHIP_ID };
> > > > +static const int bmp380_temp_coeffs[] = { 10, 1 };
> > > > +static const int bmp380_press_coeffs[] = { 1, 100000 };
> > > >
> > > > const struct bmp280_chip_info bmp380_chip_info = {
> > > > .id_reg = BMP380_REG_ID,
> > > > @@ -1323,6 +1346,11 @@ const struct bmp280_chip_info bmp380_chip_info = {
> > > > .num_iir_filter_coeffs_avail = ARRAY_SIZE(bmp380_iir_filter_coeffs_avail),
> > > > .iir_filter_coeff_default = 2,
> > > >
> > > > + .temp_coeffs = bmp380_temp_coeffs,
> > > > + .temp_coeffs_type = IIO_VAL_FRACTIONAL,
> > > > + .press_coeffs = bmp380_press_coeffs,
> > > > + .press_coeffs_type = IIO_VAL_FRACTIONAL,
> > > > +
> > > > .chip_config = bmp380_chip_config,
> > > > .read_temp = bmp380_read_temp,
> > > > .read_press = bmp380_read_press,
> > > > @@ -1443,9 +1471,9 @@ static int bmp580_nvm_operation(struct bmp280_data *data, bool is_write)
> > > > * for what is expected on IIO ABI.
> > > > */
> > > >
> >
> > ...
> >
> > > > -static int bmp580_read_temp(struct bmp280_data *data, int *val, int *val2)
> > > > +static int bmp580_read_temp(struct bmp280_data *data, s32 *raw_temp)
> > > > {
> > > > - s32 raw_temp;
> > > > + s32 value_temp;
> > > > int ret;
> > > >
> > > > ret = regmap_bulk_read(data->regmap, BMP580_REG_TEMP_XLSB, data->buf,
> > > > @@ -1455,25 +1483,19 @@ static int bmp580_read_temp(struct bmp280_data *data, int *val, int *val2)
> > > > return ret;
> > > > }
> > > >
> > > > - raw_temp = get_unaligned_le24(data->buf);
> > > > - if (raw_temp == BMP580_TEMP_SKIPPED) {
> > > > + value_temp = get_unaligned_le24(data->buf);
> > > > + if (value_temp == BMP580_TEMP_SKIPPED) {
> > > > dev_err(data->dev, "reading temperature skipped\n");
> > > > return -EIO;
> > > > }
> > > > + *raw_temp = sign_extend32(value_temp, 23);
> > > >
> >
> > Here I use Adam's correction with sign_extend32()
> >
> > > > - /*
> > > > - * Temperature is returned in Celsius degrees in fractional
> > > > - * form down 2^16. We rescale by x1000 to return millidegrees
> > > > - * Celsius to respect IIO ABI.
> > > > - */
> > > > - raw_temp = sign_extend32(raw_temp, 23);
> > > > - *val = ((s64)raw_temp * 1000) / (1 << 16);
> > > > - return IIO_VAL_INT;
> > > > + return 0;
> > > > }
> > > >
> > > > -static int bmp580_read_press(struct bmp280_data *data, int *val, int *val2)
> > > > +static int bmp580_read_press(struct bmp280_data *data, u32 *raw_press)
> > > > {
> > > > - u32 raw_press;
> > > > + u32 value_press;
> > > > int ret;
> > > >
> > > > ret = regmap_bulk_read(data->regmap, BMP580_REG_PRESS_XLSB, data->buf,
> > > > @@ -1483,18 +1505,14 @@ static int bmp580_read_press(struct bmp280_data *data, int *val, int *val2)
> > > > return ret;
> > > > }
> > > >
> > > > - raw_press = get_unaligned_le24(data->buf);
> > > > - if (raw_press == BMP580_PRESS_SKIPPED) {
> > > > + value_press = get_unaligned_le24(data->buf);
> > > > + if (value_press == BMP580_PRESS_SKIPPED) {
> > > > dev_err(data->dev, "reading pressure skipped\n");
> > > > return -EIO;
> > > > }
> > > > - /*
> > > > - * Pressure is returned in Pascals in fractional form down 2^16.
> > > > - * We rescale /1000 to convert to kilopascal to respect IIO ABI.
> > > > - */
> > > > - *val = raw_press;
> > > > - *val2 = 64000; /* 2^6 * 1000 */
> > > > - return IIO_VAL_FRACTIONAL;
> > > > + *raw_press = value_press;
> > > > +
> > > > + return 0;
> > > > }
> > > >
> > > > static const int bmp580_odr_table[][2] = {
> > > > @@ -1830,6 +1848,8 @@ static int bmp580_chip_config(struct bmp280_data *data)
> > > >
> > > > static const int bmp580_oversampling_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128 };
> > > > static const u8 bmp580_chip_ids[] = { BMP580_CHIP_ID, BMP580_CHIP_ID_ALT };
> > > > +static const int bmp580_temp_coeffs[] = { 1000, 16 };
>
> I believe we can do something similar to what Jonathan mentioned in [1]
> to avoid using a 64-bit signed int by changing these coefficients to
> something like:
>
> static const int bmp580_temp_coeffs[] = { 250, 14 };
>
> This would allow the result for the max temperature value (85) to still
> fit in a 32-bit signed integer and would give a bit more resolution in
> the result. The bit shift of 14 would achieve the same effect with the
> new scaling.
>
> 85 * 2^16 * 250 = 1,392,640,000 (can be stored as a s32)
>
> Then, 1,392,640,000 / 2^14 = 85000
>
>
> [1] https://lore.kernel.org/all/20240602201200.30418-1-ajarizzo@xxxxxxxxx/
>

Hi Adam,

This is such a good and simple idea. I don't know how it didn't even
came up to my mind. I could even push a bit further to go to 125 and 19 maybe.
Thanks a lot for the feedback.

Cheers,
Vasilis

> > > > +static const int bmp580_press_coeffs[] = { 1, 64000};
> > > >
> > > > const struct bmp280_chip_info bmp580_chip_info = {
> > > > .id_reg = BMP580_REG_CHIP_ID,
> > > > @@ -1856,6 +1876,11 @@ const struct bmp280_chip_info bmp580_chip_info = {
> > > > .num_iir_filter_coeffs_avail = ARRAY_SIZE(bmp380_iir_filter_coeffs_avail),
> > > > .iir_filter_coeff_default = 2,
> > > >
> > > > + .temp_coeffs = bmp580_temp_coeffs,
> > > > + .temp_coeffs_type = IIO_VAL_FRACTIONAL_LOG2,
> > > > + .press_coeffs = bmp580_press_coeffs,
> > > > + .press_coeffs_type = IIO_VAL_FRACTIONAL,
> > > > +
> > > > .chip_config = bmp580_chip_config,
> > > > .read_temp = bmp580_read_temp,
> > > > .read_press = bmp580_read_press,
> > > > @@ -2011,9 +2036,8 @@ static s32 bmp180_compensate_temp(struct bmp280_data *data, u32 adc_temp)
> > > > return (bmp180_calc_t_fine(data, adc_temp) + 8) / 16;
> > > > }
> > > >
> > > > -static int bmp180_read_temp(struct bmp280_data *data, int *val, int *val2)
> > > > +static int bmp180_read_temp(struct bmp280_data *data, s32 *comp_temp)
> > > > {
> > > > - s32 comp_temp;
> > > > u32 adc_temp;
> > > > int ret;
> > > >
> > > > @@ -2021,10 +2045,9 @@ static int bmp180_read_temp(struct bmp280_data *data, int *val, int *val2)
> > > > if (ret)
> > > > return ret;
> > > >
> > > > - comp_temp = bmp180_compensate_temp(data, adc_temp);
> > > > + *comp_temp = bmp180_compensate_temp(data, adc_temp);
> > > >
> > > > - *val = comp_temp * 100;
> > > > - return IIO_VAL_INT;
> > > > + return 0;
> > > > }
> > > >
> > > > static int bmp180_read_press_adc(struct bmp280_data *data, u32 *adc_press)
> > > > @@ -2087,9 +2110,9 @@ static u32 bmp180_compensate_press(struct bmp280_data *data, u32 adc_press,
> > > > return p + ((x1 + x2 + 3791) >> 4);
> > > > }
> > > >
> > > > -static int bmp180_read_press(struct bmp280_data *data, int *val, int *val2)
> > > > +static int bmp180_read_press(struct bmp280_data *data, u32 *comp_press)
> > > > {
> > > > - u32 comp_press, adc_press;
> > > > + u32 adc_press;
> > > > s32 t_fine;
> > > > int ret;
> > > >
> > > > @@ -2101,12 +2124,9 @@ static int bmp180_read_press(struct bmp280_data *data, int *val, int *val2)
> > > > if (ret)
> > > > return ret;
> > > >
> > > > - comp_press = bmp180_compensate_press(data, adc_press, t_fine);
> > > > -
> > > > - *val = comp_press;
> > > > - *val2 = 1000;
> > > > + *comp_press = bmp180_compensate_press(data, adc_press, t_fine);
> > > >
> > > > - return IIO_VAL_FRACTIONAL;
> > > > + return 0;
> > > > }
> > > >
> > > > static int bmp180_chip_config(struct bmp280_data *data)
> > > > @@ -2117,6 +2137,8 @@ static int bmp180_chip_config(struct bmp280_data *data)
> > > > static const int bmp180_oversampling_temp_avail[] = { 1 };
> > > > static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
> > > > static const u8 bmp180_chip_ids[] = { BMP180_CHIP_ID };
> > > > +static const int bmp180_temp_coeffs[] = { 100, 1 };
> > > > +static const int bmp180_press_coeffs[] = { 1, 1000 };
> > > >
> > > > const struct bmp280_chip_info bmp180_chip_info = {
> > > > .id_reg = BMP280_REG_ID,
> > > > @@ -2137,6 +2159,11 @@ const struct bmp280_chip_info bmp180_chip_info = {
> > > > ARRAY_SIZE(bmp180_oversampling_press_avail),
> > > > .oversampling_press_default = BMP180_MEAS_PRESS_8X,
> > > >
> > > > + .temp_coeffs = bmp180_temp_coeffs,
> > > > + .temp_coeffs_type = IIO_VAL_FRACTIONAL,
> > > > + .press_coeffs = bmp180_press_coeffs,
> > > > + .press_coeffs_type = IIO_VAL_FRACTIONAL,
> > > > +
> > > > .chip_config = bmp180_chip_config,
> > > > .read_temp = bmp180_read_temp,
> > > > .read_press = bmp180_read_press,
> > > > diff --git a/drivers/iio/pressure/bmp280.h b/drivers/iio/pressure/bmp280.h
> > > > index 7c30e4d523be..a3d2cd722760 100644
> > > > --- a/drivers/iio/pressure/bmp280.h
> > > > +++ b/drivers/iio/pressure/bmp280.h
> > > > @@ -446,10 +446,17 @@ struct bmp280_chip_info {
> > > > int num_sampling_freq_avail;
> > > > int sampling_freq_default;
> > > >
> > > > + const int *temp_coeffs;
> > > > + const int temp_coeffs_type;
> > > > + const int *press_coeffs;
> > > > + const int press_coeffs_type;
> > > > + const int *humid_coeffs;
> > > > + const int humid_coeffs_type;
> > > > +
> > > > int (*chip_config)(struct bmp280_data *data);
> > > > - int (*read_temp)(struct bmp280_data *data, int *val, int *val2);
> > > > - int (*read_press)(struct bmp280_data *data, int *val, int *val2);
> > > > - int (*read_humid)(struct bmp280_data *data, int *val, int *val2);
> > > > + int (*read_temp)(struct bmp280_data *data, s32 *adc_temp);
> > > > + int (*read_press)(struct bmp280_data *data, u32 *adc_press);
> > > > + int (*read_humid)(struct bmp280_data *data, u32 *adc_humidity);
> > > > int (*read_calib)(struct bmp280_data *data);
> > > > int (*preinit)(struct bmp280_data *data);
> > > > };
> > >

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