linux-kernel - Re: [PATCH v2 1/1] iio/scmi: Add reading "raw" attribute.

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Date:   Fri, 1 Oct 2021 10:12:38 +0300
From:   Andriy Tryshnivskyy <andriy.tryshnivskyy@...nsynergy.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     jbhayana@...gle.com, lars@...afoo.de, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Vasyl.Vavrychuk@...nsynergy.com
Subject: Re: [PATCH v2 1/1] iio/scmi: Add reading "raw" attribute.

Hi Jonathan,

Thank you for review!

Regards,
Andriy.

On 30.09.21 19:33, Jonathan Cameron wrote:
> CAUTION: This email originated from outside of the organization.
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>
> On Mon, 27 Sep 2021 16:22:02 +0300
> Andriy Tryshnivskyy <andriy.tryshnivskyy@...nsynergy.com> wrote:
>
>> Add IIO_CHAN_INFO_RAW to the mask and implement corresponding
>> reading "raw" attribute in scmi_iio_read_raw.
>>
>> Signed-off-by: Andriy Tryshnivskyy <andriy.tryshnivskyy@...nsynergy.com>
> Hi Andriy,
>
> Looks good to me, but I'll leave it on list to get feedback form the
> driver maintainer for this one.
>
> Feel free to poke if no reply in next 2 weeks.
>
> Thanks,
>
> Jonathan
>
>> ---
>>   drivers/iio/common/scmi_sensors/scmi_iio.c | 45 +++++++++++++++++++++-
>>   1 file changed, 44 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/iio/common/scmi_sensors/scmi_iio.c b/drivers/iio/common/scmi_sensors/scmi_iio.c
>> index 7cf2bf282cef..c6a9dc6ad140 100644
>> --- a/drivers/iio/common/scmi_sensors/scmi_iio.c
>> +++ b/drivers/iio/common/scmi_sensors/scmi_iio.c
>> @@ -286,6 +286,9 @@ static int scmi_iio_read_raw(struct iio_dev *iio_dev,
>>        struct scmi_iio_priv *sensor = iio_priv(iio_dev);
>>        s8 scale;
>>        int ret;
>> +     int err;
>> +     u32 sensor_config;
>> +     struct scmi_sensor_reading readings[SCMI_IIO_NUM_OF_AXIS];
>>
>>        switch (mask) {
>>        case IIO_CHAN_INFO_SCALE:
>> @@ -300,6 +303,45 @@ static int scmi_iio_read_raw(struct iio_dev *iio_dev,
>>        case IIO_CHAN_INFO_SAMP_FREQ:
>>                ret = scmi_iio_get_odr_val(iio_dev, val, val2);
>>                return ret ? ret : IIO_VAL_INT_PLUS_MICRO;
>> +     case IIO_CHAN_INFO_RAW:
>> +             sensor_config = FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
>> +                                        SCMI_SENS_CFG_SENSOR_ENABLE);
>> +             err = sensor->handle->sensor_ops->config_set(
>> +                     sensor->handle, sensor->sensor_info->id, sensor_config);
>> +             if (err) {
>> +                     dev_err(&iio_dev->dev,
>> +                             "Error in enabling sensor %s err %d",
>> +                             sensor->sensor_info->name, err);
>> +                     return err;
>> +             }
>> +
>> +             err = sensor->handle->sensor_ops->reading_get_timestamped(
>> +                     sensor->handle, sensor->sensor_info->id,
>> +                     sensor->sensor_info->num_axis, readings);
>> +             if (err) {
>> +                     dev_err(&iio_dev->dev,
>> +                             "Error in reading raw attribute for sensor %s err %d",
>> +                             sensor->sensor_info->name, err);
>> +                     return err;
>> +             }
>> +
>> +             sensor_config = FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
>> +                                        SCMI_SENS_CFG_SENSOR_DISABLE);
>> +             err = sensor->handle->sensor_ops->config_set(
>> +                     sensor->handle, sensor->sensor_info->id, sensor_config);
>> +             if (err) {
>> +                     dev_err(&iio_dev->dev,
>> +                             "Error in enabling sensor %s err %d",
>> +                             sensor->sensor_info->name, err);
>> +                     return err;
>> +             }
>> +             /* Check if raw value fits 32 bits */
>> +             if (readings[ch->scan_index].value < INT_MIN ||
>> +                 readings[ch->scan_index].value > INT_MAX)
>> +                     return -ERANGE;
>> +             /* Use 32-bit value, since practically there is no need in 64 bits */
>> +             *val = (int)readings[ch->scan_index].value;
>> +             return IIO_VAL_INT;
>>        default:
>>                return -EINVAL;
>>        }
>> @@ -381,7 +423,8 @@ static void scmi_iio_set_data_channel(struct iio_chan_spec *iio_chan,
>>        iio_chan->type = type;
>>        iio_chan->modified = 1;
>>        iio_chan->channel2 = mod;
>> -     iio_chan->info_mask_separate = BIT(IIO_CHAN_INFO_SCALE);
>> +     iio_chan->info_mask_separate =
>> +             BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_RAW);
>>        iio_chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ);
>>        iio_chan->info_mask_shared_by_type_available =
>>                BIT(IIO_CHAN_INFO_SAMP_FREQ);
>