On Sun, 24 Oct 2021 12:16:27 +0300
Andriy Tryshnivskyy <andriy.tryshnivskyy@xxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx>
@Jyoti,
looking for your Ack / or Reviewed-by tag for this one.
Thanks,
Jonathan
> ---
> Changes comparing v6 -> v7:
> * split into two patches: one for changes in core functionality,
> another - for changes in the driver
>
> Changes comparing v5 -> v6:
> * revert v5 changes since with scmi_iio_read_raw() the channel
> can't be used by in kernel users (iio-hwmon)
> * returned to v3 with direct mode
> * introduce new type IIO_VAL_INT_64 to read 64-bit value
>
> Changes comparing v4 -> v5:
> * call iio_device_release_direct_mode() on error
> * code cleanup, fix typo
>
> Changes comparing v3 -> v4:
> * do not use scmi_iio_get_raw() for reading raw attribute due to 32-bit
> return value limitation (actually I reverted the previous v3)
> * introduce scmi_iio_read_raw to scmi_iio_ext_info[] which can return
> 64-bit value
> * enabling/disabling and reading raw attribute is done in direct mode
>
> Changes comparing v2 -> v3:
> * adaptation for changes in structure scmi_iio_priv (no member
> named 'handle')
>
> Changes comparing v0 -> v2:
> * added an error return when the error happened during config_set
> * removed redundant cast for "readings"
> * added check if raw value fits 32 bits
>
> drivers/iio/common/scmi_sensors/scmi_iio.c | 57 +++++++++++++++++++++-
> 1 file changed, 56 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..d538bf3ab1ef 100644
> --- a/drivers/iio/common/scmi_sensors/scmi_iio.c
> +++ b/drivers/iio/common/scmi_sensors/scmi_iio.c
> @@ -279,6 +279,52 @@ static int scmi_iio_get_odr_val(struct iio_dev *iio_dev, int *val, int *val2)
> return 0;
> }
>
> +static int scmi_iio_read_channel_data(struct iio_dev *iio_dev,
> + struct iio_chan_spec const *ch, int *val, int *val2)
> +{
> + struct scmi_iio_priv *sensor = iio_priv(iio_dev);
> + u32 sensor_config;
> + struct scmi_sensor_reading readings[SCMI_IIO_NUM_OF_AXIS];
> + int err;
> +
> + sensor_config = FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
> + SCMI_SENS_CFG_SENSOR_ENABLE);
> + err = sensor->sensor_ops->config_set(
> + sensor->ph, 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->sensor_ops->reading_get_timestamped(
> + sensor->ph, 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->sensor_ops->config_set(
> + sensor->ph, sensor->sensor_info->id, sensor_config);
> + if (err) {
> + dev_err(&iio_dev->dev,
> + "Error in disabling sensor %s err %d",
> + sensor->sensor_info->name, err);
> + return err;
> + }
> +
> + *val = lower_32_bits(readings[ch->scan_index].value);
> + *val2 = upper_32_bits(readings[ch->scan_index].value);
> +
> + return IIO_VAL_INT_64;
> +}
> +
> static int scmi_iio_read_raw(struct iio_dev *iio_dev,
> struct iio_chan_spec const *ch, int *val,
> int *val2, long mask)
> @@ -300,6 +346,14 @@ 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:
> + ret = iio_device_claim_direct_mode(iio_dev);
> + if (ret)
> + return ret;
> +
> + ret = scmi_iio_read_channel_data(iio_dev, ch, val, val2);
> + iio_device_release_direct_mode(iio_dev);
> + return ret;
> default:
> return -EINVAL;
> }
> @@ -381,7 +435,8 @@ 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);
