On 14/02/16 22:37, Cristina Moraru wrote:
> Change static attribute meas_conf for bias current configuration
> to channel attribute in_magn_meas_conf and also add
> in_magn_meas_conf_available attribute to view available configurations.
>
> This patch solves functionality bug: driver was using same function
> hmc5843_set_measurement_configuration for setting bias current config
> for all device types but the function was returning -EINVAL for any
> setting >= 0x03 although, for sensor HMC5983, value 3 is valid.
>
> API for setting bias measurement configuration:
>
> normal - Normal measurement configuration (default):
> In normal measurement configuration the device
> follows normal measurement flow. Pins BP and BN
> are left floating and high impedance.
>
> positivebias - Positive bias configuration: In positive bias
> configuration, a positive current is forced across
> the resistive load on pins BP and BN.
>
> negativebias - Negative bias configuration. In negative bias
> configuration, a negative current is forced across
> the resistive load on pins BP and BN.
>
> disabled - Only available on HMC5983. Magnetic sensor is disabled.
> Temperature sensor is enabled.
>
> Signed-off-by: Cristina Moraru <cristina.morar...@gmail.com>
> Cc: Daniel Baluta <daniel.bal...@intel.com>
Hmm. I do slightly wonder if we can come up with a more generic name for this
as I doubt this will be the last magnetometer we ever see with this sort
of functionality.
Lets leave it be for now as it is not too much a burden to support a more
generic interface in addition to this one in the future.
Applied to the togreg branch of iio.git - initialy pushed out as testing for
the auto builders to play with it.
Thanks,
Jonathan
> ---
> Changes since v1:
> Changed user interface for bias configuration from
> integer values to string values in order to make it
> more suggestive.
> Used iio_enum from implementation.
> drivers/staging/iio/magnetometer/hmc5843_core.c | 133
> ++++++++++++++++--------
> 1 file changed, 87 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/staging/iio/magnetometer/hmc5843_core.c
> b/drivers/staging/iio/magnetometer/hmc5843_core.c
> index e270ea1..77882b4 100644
> --- a/drivers/staging/iio/magnetometer/hmc5843_core.c
> +++ b/drivers/staging/iio/magnetometer/hmc5843_core.c
> @@ -65,6 +65,33 @@
> #define HMC5843_MEAS_CONF_NEGATIVE_BIAS 0x02
> #define HMC5843_MEAS_CONF_MASK 0x03
>
> +/*
> + * API for setting the measurement configuration to
> + * Normal, Positive bias and Negative bias
> + *
> + * From the datasheet:
> + * 0 - Normal measurement configuration (default): In normal measurement
> + * configuration the device follows normal measurement flow. Pins BP
> + * and BN are left floating and high impedance.
> + *
> + * 1 - Positive bias configuration: In positive bias configuration, a
> + * positive current is forced across the resistive load on pins BP
> + * and BN.
> + *
> + * 2 - Negative bias configuration. In negative bias configuration, a
> + * negative current is forced across the resistive load on pins BP
> + * and BN.
> + *
> + * 3 - Only available on HMC5983. Magnetic sensor is disabled.
> + * Temperature sensor is enabled.
> + */
> +
> +static const char *const hmc5843_meas_conf_modes[] = {"normal",
> "positivebias",
> + "negativebias"};
> +
> +static const char *const hmc5983_meas_conf_modes[] = {"normal",
> "positivebias",
> + "negativebias",
> + "disabled"};
> /* Scaling factors: 10000000/Gain */
> static const int hmc5843_regval_to_nanoscale[] = {
> 6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714
> @@ -173,24 +200,6 @@ static int hmc5843_read_measurement(struct hmc5843_data
> *data,
> return IIO_VAL_INT;
> }
>
> -/*
> - * API for setting the measurement configuration to
> - * Normal, Positive bias and Negative bias
> - *
> - * From the datasheet:
> - * 0 - Normal measurement configuration (default): In normal measurement
> - * configuration the device follows normal measurement flow. Pins BP
> - * and BN are left floating and high impedance.
> - *
> - * 1 - Positive bias configuration: In positive bias configuration, a
> - * positive current is forced across the resistive load on pins BP
> - * and BN.
> - *
> - * 2 - Negative bias configuration. In negative bias configuration, a
> - * negative current is forced across the resistive load on pins BP
> - * and BN.
> - *
> - */
> static int hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf)
> {
> int ret;
> @@ -204,48 +213,55 @@ static int hmc5843_set_meas_conf(struct hmc5843_data
> *data, u8 meas_conf)
> }
>
> static
> -ssize_t hmc5843_show_measurement_configuration(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> +int hmc5843_show_measurement_configuration(struct iio_dev *indio_dev,
> + const struct iio_chan_spec *chan)
> {
> - struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
> + struct hmc5843_data *data = iio_priv(indio_dev);
> unsigned int val;
> int ret;
>
> ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &val);
> if (ret)
> return ret;
> - val &= HMC5843_MEAS_CONF_MASK;
>
> - return sprintf(buf, "%d\n", val);
> + return val & HMC5843_MEAS_CONF_MASK;
> }
>
> static
> -ssize_t hmc5843_set_measurement_configuration(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf,
> - size_t count)
> +int hmc5843_set_measurement_configuration(struct iio_dev *indio_dev,
> + const struct iio_chan_spec *chan,
> + unsigned int meas_conf)
> {
> - struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
> - unsigned long meas_conf = 0;
> - int ret;
> + struct hmc5843_data *data = iio_priv(indio_dev);
>
> - ret = kstrtoul(buf, 10, &meas_conf);
> - if (ret)
> - return ret;
> - if (meas_conf >= HMC5843_MEAS_CONF_MASK)
> - return -EINVAL;
> + return hmc5843_set_meas_conf(data, meas_conf);
> +}
>
> - ret = hmc5843_set_meas_conf(data, meas_conf);
> +static const struct iio_enum hmc5843_meas_conf_enum = {
> + .items = hmc5843_meas_conf_modes,
> + .num_items = ARRAY_SIZE(hmc5843_meas_conf_modes),
> + .get = hmc5843_show_measurement_configuration,
> + .set = hmc5843_set_measurement_configuration,
> +};
>
> - return (ret < 0) ? ret : count;
> -}
> +static const struct iio_chan_spec_ext_info hmc5843_ext_info[] = {
> + IIO_ENUM("meas_conf", true, &hmc5843_meas_conf_enum),
> + IIO_ENUM_AVAILABLE("meas_conf", &hmc5843_meas_conf_enum),
> + { },
> +};
>
> -static IIO_DEVICE_ATTR(meas_conf,
> - S_IWUSR | S_IRUGO,
> - hmc5843_show_measurement_configuration,
> - hmc5843_set_measurement_configuration,
> - 0);
> +static const struct iio_enum hmc5983_meas_conf_enum = {
> + .items = hmc5983_meas_conf_modes,
> + .num_items = ARRAY_SIZE(hmc5983_meas_conf_modes),
> + .get = hmc5843_show_measurement_configuration,
> + .set = hmc5843_set_measurement_configuration,
> +};
> +
> +static const struct iio_chan_spec_ext_info hmc5983_ext_info[] = {
> + IIO_ENUM("meas_conf", true, &hmc5983_meas_conf_enum),
> + IIO_ENUM_AVAILABLE("meas_conf", &hmc5983_meas_conf_enum),
> + { },
> +};
>
> static
> ssize_t hmc5843_show_samp_freq_avail(struct device *dev,
> @@ -458,6 +474,25 @@ done:
> .storagebits = 16, \
> .endianness = IIO_BE, \
> }, \
> + .ext_info = hmc5843_ext_info, \
> + }
> +
> +#define HMC5983_CHANNEL(axis, idx) \
> + { \
> + .type = IIO_MAGN, \
> + .modified = 1, \
> + .channel2 = IIO_MOD_##axis, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
> + BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .scan_index = idx, \
> + .scan_type = { \
> + .sign = 's', \
> + .realbits = 16, \
> + .storagebits = 16, \
> + .endianness = IIO_BE, \
> + }, \
> + .ext_info = hmc5983_ext_info, \
> }
>
> static const struct iio_chan_spec hmc5843_channels[] = {
> @@ -475,8 +510,14 @@ static const struct iio_chan_spec hmc5883_channels[] = {
> IIO_CHAN_SOFT_TIMESTAMP(3),
> };
>
> +static const struct iio_chan_spec hmc5983_channels[] = {
> + HMC5983_CHANNEL(X, 0),
> + HMC5983_CHANNEL(Z, 1),
> + HMC5983_CHANNEL(Y, 2),
> + IIO_CHAN_SOFT_TIMESTAMP(3),
> +};
> +
> static struct attribute *hmc5843_attributes[] = {
> - &iio_dev_attr_meas_conf.dev_attr.attr,
> &iio_dev_attr_scale_available.dev_attr.attr,
> &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
> NULL
> @@ -515,7 +556,7 @@ static const struct hmc5843_chip_info
> hmc5843_chip_info_tbl[] = {
> ARRAY_SIZE(hmc5883l_regval_to_nanoscale),
> },
> [HMC5983_ID] = {
> - .channels = hmc5883_channels,
> + .channels = hmc5983_channels,
> .regval_to_samp_freq = hmc5983_regval_to_samp_freq,
> .n_regval_to_samp_freq =
> ARRAY_SIZE(hmc5983_regval_to_samp_freq),
>
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