linux-kernel - Re: [PATCH v3 2/3] iio: temperature: mlx90632 Read sampling frequency

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Date:   Tue, 6 Sep 2022 13:21:36 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Crt Mori <cmo@...exis.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] iio: temperature: mlx90632 Read sampling frequency

On Tue, Sep 6, 2022 at 12:04 PM <cmo@...exis.com> wrote:
>
> From: Crt Mori <cmo@...exis.com>
>
> Allow users to read sensor sampling frequency to better plan the
> application measurement requests.
>
> Signed-off-by: Crt Mori <cmo@...exis.com>
> ---
>  drivers/iio/temperature/mlx90632.c | 51 ++++++++++++++++++++++++++++++
>  1 file changed, 51 insertions(+)
>
> diff --git a/drivers/iio/temperature/mlx90632.c b/drivers/iio/temperature/mlx90632.c
> index e41a18edbc65..6b33284eb0b6 100644
> --- a/drivers/iio/temperature/mlx90632.c
> +++ b/drivers/iio/temperature/mlx90632.c
> @@ -81,6 +81,9 @@
>  #define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous */
>
>  #define MLX90632_EE_RR GENMASK(10, 8) /* Only Refresh Rate bits */
> +#define MLX90632_REFRESH_RATE(ee_val) FIELD_GET(MLX90632_EE_RR, ee_val)
> +                                       /* Extract Refresh Rate from ee register */
> +#define MLX90632_REFRESH_RATE_STATUS(refresh_rate) (refresh_rate << 8)
>
>  /* Measurement types */
>  #define MLX90632_MTYP_MEDICAL 0
> @@ -915,6 +918,24 @@ static int mlx90632_calc_ambient_dsp105(struct mlx90632_data *data, int *val)
>         return ret;
>  }
>
> +static int mlx90632_get_refresh_rate(struct mlx90632_data *data,
> +                                    int *refresh_rate)
> +{
> +       unsigned int meas1;
> +       int ret;
> +
> +       ret = regmap_read(data->regmap, MLX90632_EE_MEDICAL_MEAS1, &meas1);
> +       if (ret < 0)
> +               return ret;
> +
> +       *refresh_rate = MLX90632_REFRESH_RATE(meas1);
> +
> +       return ret;
> +}
> +
> +static const int mlx90632_freqs[][2] = { {0, 500000}, {1, 0}, {2, 0}, {4, 0},
> +                                         {8, 0}, {16, 0}, {32, 0}, {64, 0} };

I would indent this as
_freqs ... = {
  ...pairs...
};

Either way,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> +
>  /**
>   * mlx90632_pm_interraction_wakeup() - Measure time between user interactions to change powermode
>   * @data: pointer to mlx90632_data object containing interaction_ts information
> @@ -993,6 +1014,15 @@ static int mlx90632_read_raw(struct iio_dev *indio_dev,
>                 *val = data->object_ambient_temperature;
>                 ret = IIO_VAL_INT;
>                 break;
> +       case IIO_CHAN_INFO_SAMP_FREQ:
> +               ret = mlx90632_get_refresh_rate(data, &cr);
> +               if (ret < 0)
> +                       goto mlx90632_read_raw_pm;
> +
> +               *val = mlx90632_freqs[cr][0];
> +               *val2 = mlx90632_freqs[cr][1];
> +               ret = IIO_VAL_INT_PLUS_MICRO;
> +               break;
>         default:
>                 ret = -EINVAL;
>                 break;
> @@ -1026,12 +1056,30 @@ static int mlx90632_write_raw(struct iio_dev *indio_dev,
>         }
>  }
>
> +static int mlx90632_read_avail(struct iio_dev *indio_dev,
> +                              struct iio_chan_spec const *chan,
> +                              const int **vals, int *type, int *length,
> +                              long mask)
> +{
> +       switch (mask) {
> +       case IIO_CHAN_INFO_SAMP_FREQ:
> +               *vals = (int *)mlx90632_freqs;
> +               *type = IIO_VAL_INT_PLUS_MICRO;
> +               *length = 2 * ARRAY_SIZE(mlx90632_freqs);
> +               return IIO_AVAIL_LIST;
> +       default:
> +               return -EINVAL;
> +       }
> +}
> +
>  static const struct iio_chan_spec mlx90632_channels[] = {
>         {
>                 .type = IIO_TEMP,
>                 .modified = 1,
>                 .channel2 = IIO_MOD_TEMP_AMBIENT,
>                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
> +               .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
> +               .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
>         },
>         {
>                 .type = IIO_TEMP,
> @@ -1039,12 +1087,15 @@ static const struct iio_chan_spec mlx90632_channels[] = {
>                 .channel2 = IIO_MOD_TEMP_OBJECT,
>                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
>                         BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | BIT(IIO_CHAN_INFO_CALIBAMBIENT),
> +               .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
> +               .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
>         },
>  };
>
>  static const struct iio_info mlx90632_info = {
>         .read_raw = mlx90632_read_raw,
>         .write_raw = mlx90632_write_raw,
> +       .read_avail = mlx90632_read_avail,
>  };
>
>  static int mlx90632_sleep(struct mlx90632_data *data)
> --
> 2.34.1
>


-- 
With Best Regards,
Andy Shevchenko