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Date: Mon, 27 Jun 2022 18:10:48 +0200
From: Angel Iglesias <ang.iglesiasg@...il.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: Lars-Peter Clausen <lars@...afoo.de>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Ulf Hansson <ulf.hansson@...aro.org>,
Paul Cercueil <paul@...pouillou.net>,
linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] iio: pressure: bmp280: Adds more tunable config
parameters for BMP380
On dom, 2022-06-26 at 15:39 +0100, Jonathan Cameron wrote:
> On Sat, 25 Jun 2022 17:10:36 +0200
> Angel Iglesias <ang.iglesiasg@...il.com> wrote:
>
> > Allows to configure the IIR filter coefficient and the sampling
> > frequency
> > The IIR filter coefficient is exposed using the sysfs attribute
> > "filter_low_pass_3db_frequency"
> >
> > Signed-off-by: Angel Iglesias <ang.iglesiasg@...il.com>
> Hi Angel
>
> A few comments inline,
> > ---
> > drivers/iio/pressure/bmp280-core.c | 168
> > ++++++++++++++++++++++++++++-
> > drivers/iio/pressure/bmp280.h | 18 ----
> > 2 files changed, 166 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/iio/pressure/bmp280-core.c
> > b/drivers/iio/pressure/bmp280-core.c
> > index 3887475a9059..3d22fc844e87 100644
> > --- a/drivers/iio/pressure/bmp280-core.c
> > +++ b/drivers/iio/pressure/bmp280-core.c
> > @@ -96,6 +96,27 @@ static const char *const bmp280_supply_names[] =
> > {
> > "vddd", "vdda"
> > };
> >
> > +enum bmp380_odr {
> > + BMP380_ODR_200HZ,
> > + BMP380_ODR_100HZ,
> > + BMP380_ODR_50HZ,
> > + BMP380_ODR_25HZ,
> > + BMP380_ODR_12_5HZ,
> > + BMP380_ODR_6_25HZ,
> > + BMP380_ODR_3_125HZ,
> > + BMP380_ODR_1_5625HZ,
> > + BMP380_ODR_0_78HZ,
> > + BMP380_ODR_0_39HZ,
> > + BMP380_ODR_0_2HZ,
> > + BMP380_ODR_0_1HZ,
> > + BMP380_ODR_0_05HZ,
> > + BMP380_ODR_0_02HZ,
> > + BMP380_ODR_0_01HZ,
> > + BMP380_ODR_0_006HZ,
> > + BMP380_ODR_0_003HZ,
> > + BMP380_ODR_0_0015HZ
> > +};
> > +
> > #define BMP280_NUM_SUPPLIES ARRAY_SIZE(bmp280_supply_names)
> >
> > struct bmp280_data {
> > @@ -117,6 +138,16 @@ struct bmp280_data {
> > u8 oversampling_press;
> > u8 oversampling_temp;
> > u8 oversampling_humid;
> > + u8 iir_filter_coeff;
> > +
> > + /* BMP380 devices introduce sampling frequecy
> > configuration. See
> > + * datasheet sections 3.3.3. and 4.3.19.
> > + *
> > + * BMx280 devices allowed indirect configuration of
> > sampling frequency
> > + * changing the t_standby duration between measurements.
> > See datasheet
> > + * section 3.6.3
> > + */
> > + int sampling_freq;
> >
> > /*
> > * Carryover value from temperature conversion, used in
> > pressure
> > @@ -135,6 +166,12 @@ struct bmp280_chip_info {
> > const int *oversampling_humid_avail;
> > int num_oversampling_humid_avail;
> >
> > + const int *iir_filter_coeffs_avail;
> > + int num_iir_filter_coeffs_avail;
> > +
> > + const int (*sampling_freq_avail)[2];
> > + int num_sampling_freq_avail;
> > +
> > int (*chip_config)(struct bmp280_data *);
> > int (*read_temp)(struct bmp280_data *, int *);
> > int (*read_press)(struct bmp280_data *, int *, int *);
> > @@ -185,6 +222,30 @@ static const struct iio_chan_spec
> > bmp280_channels[] = {
> > },
> > };
> >
> > +static const struct iio_chan_spec bmp380_channels[] = {
> > + {
> > + .type = IIO_PRESSURE,
> > + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED)
> > |
> > +
> > BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
> > + .info_mask_shared_by_all =
> > BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> > +
> > BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
> > + },
> > + {
> > + .type = IIO_TEMP,
> > + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED)
> > |
> > +
> > BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
> > + .info_mask_shared_by_all =
> > BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> > +
> > BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
> > + },
> > + {
> > + .type = IIO_HUMIDITYRELATIVE,
> > + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED)
> > |
> > +
> > BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
> > + .info_mask_shared_by_all =
> > BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> > +
> > BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
> > + },
> > +};
> > +
> > static int bmp280_read_calib(struct bmp280_data *data,
> > struct bmp280_calib *calib,
> > unsigned int chip)
> > @@ -514,6 +575,15 @@ static int bmp280_read_raw(struct iio_dev
> > *indio_dev,
> > break;
> > }
> > break;
> > + case IIO_CHAN_INFO_SAMP_FREQ:
> > + *val = data->chip_info->sampling_freq_avail[data-
> > >sampling_freq][0];
> This is currently safe, but given sampling_freq_avail is only present
> for one device type,
> I'd prefer a sanity check that it is not NULL.
Sure!
> > + *val2 = data->chip_info->sampling_freq_avail[data-
> > >sampling_freq][1];
> > + ret = IIO_VAL_INT_PLUS_MICRO;
> > + break;
> > + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
> > + *val = data->chip_info-
> > >iir_filter_coeffs_avail[data->iir_filter_coeff];
> > + ret = IIO_VAL_INT;
> > + break;
> > default:
> > ret = -EINVAL;
> > break;
> > @@ -577,6 +647,39 @@ static int
> > bmp280_write_oversampling_ratio_press(struct bmp280_data *data,
> > return -EINVAL;
> > }
> >
> > +static int bmp280_write_sampling_frequency(struct bmp280_data
> > *data,
> > + int val, int val2)
> > +{
> > + int i;
> > + const int (*avail)[2] = data->chip_info-
> > >sampling_freq_avail;
> > + const int n = data->chip_info->num_sampling_freq_avail;
> > +
> > + for (i = 0; i < n; i++) {
> > + if (avail[i][0] == val && avail[i][1] == val2) {
> > + data->sampling_freq = i;
> better to only set the cached value if the write succeeds.
>
> e.g.
> ret = data->chip_info->chip_config(data);
> if (ret)
> return ret;
>
> data->sampling_freq = i;
>
> return 0;
Ok! Should I restore the previous value in case of failure?
> > +
> > + return data->chip_info->chip_config(data);
> > + }
> > + }
> > + return -EINVAL;
> > +}
> > +
> > +static int bmp280_write_iir_filter_coeffs(struct bmp280_data
> > *data, int val)
> > +{
> > + int i;
> > + const int *avail = data->chip_info-
> > >iir_filter_coeffs_avail;
> > + const int n = data->chip_info->num_iir_filter_coeffs_avail;
> > +
> > + for (i = 0; i < n; i++) {
> > + if (avail[i] == val) {
> > + data->iir_filter_coeff = i;
> > +
> As for previous function, set the cached value only after you know
> the write
> succeeded.
>
> > + return data->chip_info->chip_config(data);
> > + }
> > + }
> > + return -EINVAL;
> > +}
> > +
> > static int bmp280_write_raw(struct iio_dev *indio_dev,
> > struct iio_chan_spec const *chan,
> > int val, int val2, long mask)
> > @@ -606,6 +709,22 @@ static int bmp280_write_raw(struct iio_dev
> > *indio_dev,
> > pm_runtime_mark_last_busy(data->dev);
> > pm_runtime_put_autosuspend(data->dev);
> > break;
> > + case IIO_CHAN_INFO_SAMP_FREQ:
> > + pm_runtime_get_sync(data->dev);
> > + mutex_lock(&data->lock);
> > + ret = bmp280_write_sampling_frequency(data, val,
> > val2);
> > + mutex_unlock(&data->lock);
> > + pm_runtime_mark_last_busy(data->dev);
> > + pm_runtime_put_autosuspend(data->dev);
> > + break;
> > + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
> > + pm_runtime_get_sync(data->dev);
> > + mutex_lock(&data->lock);
> > + ret = bmp280_write_iir_filter_coeffs(data, val);
> > + mutex_unlock(&data->lock);
> > + pm_runtime_mark_last_busy(data->dev);
> > + pm_runtime_put_autosuspend(data->dev);
> > + break;
> > default:
> > return -EINVAL;
> > }
> > @@ -636,6 +755,17 @@ static int bmp280_read_avail(struct iio_dev
> > *indio_dev,
> > }
> > *type = IIO_VAL_INT;
> > return IIO_AVAIL_LIST;
> > + case IIO_CHAN_INFO_SAMP_FREQ:
> > + *vals = (const int *)data->chip_info-
> > >sampling_freq_avail;
> > + *type = IIO_VAL_INT_PLUS_MICRO;
> > + /* Values are stored in a 2D matrix */
> > + *length = data->chip_info->num_sampling_freq_avail;
> > + return IIO_AVAIL_LIST;
> > + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
> > + *vals = data->chip_info->iir_filter_coeffs_avail;
> > + *type = IIO_VAL_INT;
> > + *length = data->chip_info-
> > >num_iir_filter_coeffs_avail;
> > + return IIO_AVAIL_LIST;
> > default:
> > return -EINVAL;
> > }
> > @@ -749,7 +879,7 @@ static int bmp380_cmd(struct bmp280_data *data,
> > u8 cmd)
> > goto failure;
> > }
> > /* wait for 2ms for command to be proccessed */
> > - usleep_range(2000, 2500);
> > + usleep_range(data->start_up_time, data->start_up_time +
> > 100);
> > /* check for command processing error */
> > ret = regmap_read(data->regmap, BMP380_REG_ERROR, ®);
> > if (ret) {
> > @@ -943,6 +1073,27 @@ static int bmp380_read_calib(struct
> > bmp280_data *data,
> > return 0;
> > }
> >
> > +static const int bmp380_odr_table[][2] = {
> > + [BMP380_ODR_200HZ] = {200, 0},
> > + [BMP380_ODR_100HZ] = {100, 0},
> > + [BMP380_ODR_50HZ] = {50, 0},
> > + [BMP380_ODR_25HZ] = {25, 0},
> > + [BMP380_ODR_12_5HZ] = {12, 500000},
> > + [BMP380_ODR_6_25HZ] = {6, 250000},
> > + [BMP380_ODR_3_125HZ] = {3, 125000},
> > + [BMP380_ODR_1_5625HZ] = {1, 562500},
> > + [BMP380_ODR_0_78HZ] = {0, 781250},
> > + [BMP380_ODR_0_39HZ] = {0, 390625},
> > + [BMP380_ODR_0_2HZ] = {0, 195313},
> > + [BMP380_ODR_0_1HZ] = {0, 97656},
> > + [BMP380_ODR_0_05HZ] = {0, 48828},
> > + [BMP380_ODR_0_02HZ] = {0, 24414},
> > + [BMP380_ODR_0_01HZ] = {0, 12207},
> > + [BMP380_ODR_0_006HZ] = {0, 6104},
> > + [BMP380_ODR_0_003HZ] = {0, 3052},
> > + [BMP380_ODR_0_0015HZ] = {0, 1526},
> > +};
> > +
> > static int bmp380_chip_config(struct bmp280_data *data)
> > {
> > u8 osrs;
> > @@ -976,7 +1127,7 @@ static int bmp380_chip_config(struct
> > bmp280_data *data)
> >
> > /* configure output data rate */
> > ret = regmap_write_bits(data->regmap, BMP380_REG_ODR,
> > - BMP380_ODRS_MASK,
> > BMP380_ODRS_50HZ);
> > + BMP380_ODRS_MASK, data-
> > >sampling_freq);
> > if (ret < 0) {
> > dev_err(data->dev, "failed to write ODR selection
> > register\n");
> > return ret;
> > @@ -990,6 +1141,9 @@ static int bmp380_chip_config(struct
> > bmp280_data *data)
> > return ret;
> > }
> >
> > + /* startup time wait to verify config */
> > + usleep_range(data->start_up_time, data->start_up_time +
> > 100);
> > +
>
> Only necessary now? Or is this a fix for what was here before?
Hum, this sleep should be also present on the previous patch, my bad.
> > /* check config error flag */
> > ret = regmap_read(data->regmap, BMP380_REG_ERROR, &tmp);
> > if (ret < 0) {
> > @@ -1007,6 +1161,7 @@ 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[] = { 0, 1, 3, 7,
> > 15, 31, 63, 127 };
> >
> > static const struct bmp280_chip_info bmp380_chip_info = {
> > .oversampling_temp_avail = bmp380_oversampling_avail,
> > @@ -1015,6 +1170,12 @@ static const struct bmp280_chip_info
> > bmp380_chip_info = {
> > .oversampling_press_avail = bmp380_oversampling_avail,
> > .num_oversampling_press_avail =
> > ARRAY_SIZE(bmp380_oversampling_avail),
> >
> > + .sampling_freq_avail = bmp380_odr_table,
> > + .num_sampling_freq_avail = ARRAY_SIZE(bmp380_odr_table) *
> > 2,
> > +
> > + .iir_filter_coeffs_avail = bmp380_iir_filter_coeffs_avail,
> > + .num_iir_filter_coeffs_avail =
> > ARRAY_SIZE(bmp380_iir_filter_coeffs_avail),
> > +
> > .chip_config = bmp380_chip_config,
> > .read_temp = bmp380_read_temp,
> > .read_press = bmp380_read_press,
> > @@ -1369,9 +1530,12 @@ int bmp280_common_probe(struct device *dev,
> > break;
> > case BMP380_CHIP_ID:
> > indio_dev->num_channels = 2;
> > + indio_dev->channels = bmp380_channels;
> > data->chip_info = &bmp380_chip_info;
> > data->oversampling_press = ilog2(4);
> > data->oversampling_temp = ilog2(1);
> > + data->iir_filter_coeff = 2;
> > + data->sampling_freq = BMP380_ODR_50HZ;
> > data->start_up_time = 2000;
> > break;
> > default:
> > diff --git a/drivers/iio/pressure/bmp280.h
> > b/drivers/iio/pressure/bmp280.h
> > index b4c122525ffe..f9e21546957e 100644
> > --- a/drivers/iio/pressure/bmp280.h
> > +++ b/drivers/iio/pressure/bmp280.h
> > @@ -71,24 +71,6 @@
> > #define BMP380_OSRS_PRESS_32X BMP380_OSRS_PRESS_X(5)
> >
> > #define BMP380_ODRS_MASK GENMASK(4, 0)
> > -#define BMP380_ODRS_200HZ 0x00
> > -#define BMP380_ODRS_100HZ 0x01
> > -#define BMP380_ODRS_50HZ 0x02
> > -#define BMP380_ODRS_25HZ 0x03
> > -#define BMP380_ODRS_12_5HZ 0x04
> > -#define BMP380_ODRS_6_25HZ 0x05
> > -#define BMP380_ODRS_3_1HZ 0x06
> > -#define BMP380_ODRS_1_5HZ 0x07
> > -#define BMP380_ODRS_0_78HZ 0x08
> > -#define BMP380_ODRS_0_39HZ 0x09
> > -#define BMP380_ODRS_0_2HZ 0x0A
> > -#define BMP380_ODRS_0_1HZ 0x0B
> > -#define BMP380_ODRS_0_05HZ 0x0C
> > -#define BMP380_ODRS_0_02HZ 0x0D
> > -#define BMP380_ODRS_0_01HZ 0x0E
> > -#define BMP380_ODRS_0_006HZ 0x0F
> > -#define BMP380_ODRS_0_003HZ 0x10
> > -#define BMP380_ODRS_0_0015HZ 0x11
> >
> > #define BMP380_CTRL_SENSORS_MASK GENMASK(1, 0)
> > #define BMP380_CTRL_SENSORS_PRESS_EN BIT(0)
>
I'll try to post the revised version of the patches this week. Thanks
for your time!
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