Add static attribute meas_conf_available to show available
configurations for the bias current.
API for setting bias measurement configuration:
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.
Signed-off-by: Cristina Moraru <cristina.moraru09@xxxxxxxxx>
---
drivers/staging/iio/magnetometer/hmc5843_core.c | 83 +++++++++++++++++++------
1 file changed, 65 insertions(+), 18 deletions(-)
diff --git a/drivers/staging/iio/magnetometer/hmc5843_core.c b/drivers/staging/iio/magnetometer/hmc5843_core.c
index 4aab022..4e2a7ec 100644
--- a/drivers/staging/iio/magnetometer/hmc5843_core.c
+++ b/drivers/staging/iio/magnetometer/hmc5843_core.c
@@ -66,6 +66,34 @@
#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 int hmc5843_regval_to_meas_conf[] = {
+ 0, 1, 2
+};
+
+static const int hmc5983_regval_to_meas_conf[] = {
+ 0, 1, 2, 3
+};
+
/* Scaling factors: 10000000/Gain */
static const int hmc5843_regval_to_nanoscale[] = {
6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714
@@ -109,6 +137,8 @@ static const int hmc5983_regval_to_samp_freq[][2] = {
/* Describe chip variants */
struct hmc5843_chip_info {
const struct iio_chan_spec *channels;
+ const int *regval_to_meas_conf;
+ const int n_regval_to_meas_conf;
const int (*regval_to_samp_freq)[2];
const int n_regval_to_samp_freq;
const int *regval_to_nanoscale;
@@ -174,24 +204,6 @@ 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;
@@ -248,6 +260,28 @@ static IIO_DEVICE_ATTR(meas_conf,
hmc5843_set_measurement_configuration,
0);
+static ssize_t hmc5843_show_meas_conf_avail(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
+
+ size_t len = 0;
+ int i;
+
+ for (i = 0; i < data->variant->n_regval_to_meas_conf; i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "%d ", data->variant->regval_to_meas_conf[i]);
+
+ /* replace trailing space by newline */
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static IIO_DEVICE_ATTR(meas_conf_available, S_IRUGO,
+ hmc5843_show_meas_conf_avail, NULL, 0);
+
static
ssize_t hmc5843_show_samp_freq_avail(struct device *dev,
struct device_attribute *attr, char *buf)
@@ -478,6 +512,7 @@ static const struct iio_chan_spec hmc5883_channels[] = {
static struct attribute *hmc5843_attributes[] = {
&iio_dev_attr_meas_conf.dev_attr.attr,
+ &iio_dev_attr_meas_conf_available.dev_attr.attr,
&iio_dev_attr_scale_available.dev_attr.attr,
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
NULL
@@ -490,6 +525,9 @@ static const struct attribute_group hmc5843_group = {
static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = {
[HMC5843_ID] = {
.channels = hmc5843_channels,
+ .regval_to_meas_conf = hmc5843_regval_to_meas_conf,
+ .n_regval_to_meas_conf =
+ ARRAY_SIZE(hmc5843_regval_to_meas_conf),
.regval_to_samp_freq = hmc5843_regval_to_samp_freq,
.n_regval_to_samp_freq =
ARRAY_SIZE(hmc5843_regval_to_samp_freq),
@@ -499,6 +537,9 @@ static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = {
},
[HMC5883_ID] = {
.channels = hmc5883_channels,
+ .regval_to_meas_conf = hmc5843_regval_to_meas_conf,
+ .n_regval_to_meas_conf =
+ ARRAY_SIZE(hmc5843_regval_to_meas_conf),
.regval_to_samp_freq = hmc5883_regval_to_samp_freq,
.n_regval_to_samp_freq =
ARRAY_SIZE(hmc5883_regval_to_samp_freq),
@@ -508,6 +549,9 @@ static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = {
},
[HMC5883L_ID] = {
.channels = hmc5883_channels,
+ .regval_to_meas_conf = hmc5843_regval_to_meas_conf,
+ .n_regval_to_meas_conf =
+ ARRAY_SIZE(hmc5843_regval_to_meas_conf),
.regval_to_samp_freq = hmc5883_regval_to_samp_freq,
.n_regval_to_samp_freq =
ARRAY_SIZE(hmc5883_regval_to_samp_freq),
@@ -517,6 +561,9 @@ static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = {
},
[HMC5983_ID] = {
.channels = hmc5883_channels,
+ .regval_to_meas_conf = hmc5983_regval_to_meas_conf,
+ .n_regval_to_meas_conf =
+ ARRAY_SIZE(hmc5983_regval_to_meas_conf),
.regval_to_samp_freq = hmc5983_regval_to_samp_freq,
.n_regval_to_samp_freq =
ARRAY_SIZE(hmc5983_regval_to_samp_freq),
--
1.9.1
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