The vcnl4040 proximity sensor defaults to 12 bit data resolution, but
the chip also supports 16 bit data resolution, which is called proximity
high definition (PS_HD).
Add read/write attribute for proximity resolution, and read attribute
for available proximity resolution values for the vcnl4040 chip.
Signed-off-by: Mårten Lindahl <marten.lindahl@xxxxxxxx>
---
drivers/iio/light/vcnl4000.c | 87 +++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 85 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index fdf763a04b0b..2addff635b79 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -90,6 +90,7 @@
#define VCNL4040_PS_CONF1_PS_SHUTDOWN BIT(0)
#define VCNL4040_PS_CONF2_PS_IT GENMASK(3, 1) /* Proximity integration time */
#define VCNL4040_CONF1_PS_PERS GENMASK(5, 4) /* Proximity interrupt persistence setting */
+#define VCNL4040_PS_CONF2_PS_HD BIT(11) /* Proximity high definition */
#define VCNL4040_PS_CONF2_PS_INT GENMASK(9, 8) /* Proximity interrupt mode */
#define VCNL4040_PS_CONF3_MPS GENMASK(6, 5) /* Proximity multi pulse number */
#define VCNL4040_PS_MS_LED_I GENMASK(10, 8) /* Proximity current */
@@ -170,6 +171,11 @@ static const int vcnl4040_ps_calibbias_ua[][2] = {
{0, 200000},
};
+static const int vcnl4040_ps_resolutions[2] = {
+ 12,
+ 16
+};
+
static const int vcnl4040_als_persistence[] = {1, 2, 4, 8};
static const int vcnl4040_ps_persistence[] = {1, 2, 3, 4};
static const int vcnl4040_ps_oversampling_ratio[] = {1, 2, 4, 8};
@@ -880,6 +886,54 @@ static ssize_t vcnl4040_write_ps_calibbias(struct vcnl4000_data *data, int val)
return ret;
}
+static ssize_t vcnl4040_read_ps_resolution(struct vcnl4000_data *data, int *val, int *val2)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
+ if (ret < 0)
+ return ret;
+
+ ret = FIELD_GET(VCNL4040_PS_CONF2_PS_HD, ret);
+ if (ret >= ARRAY_SIZE(vcnl4040_ps_resolutions))
+ return -EINVAL;
+
+ *val = vcnl4040_ps_resolutions[ret];
+ *val2 = 0;
+
+ return ret;
+}
+
+static ssize_t vcnl4040_write_ps_resolution(struct vcnl4000_data *data, int val)
+{
+ unsigned int i;
+ int ret;
+ u16 regval;
+
+ for (i = 0; i < ARRAY_SIZE(vcnl4040_ps_resolutions); i++) {
+ if (val == vcnl4040_ps_resolutions[i])
+ break;
+ }
+
+ if (i >= ARRAY_SIZE(vcnl4040_ps_resolutions))
+ return -EINVAL;
+
+ mutex_lock(&data->vcnl4000_lock);
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
+ if (ret < 0)
+ goto out_unlock;
+
+ regval = (ret & ~VCNL4040_PS_CONF2_PS_HD);
+ regval |= FIELD_PREP(VCNL4040_PS_CONF2_PS_HD, i);
+ ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1,
+ regval);
+
+out_unlock:
+ mutex_unlock(&data->vcnl4000_lock);
+ return ret;
+}
+
static int vcnl4000_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
@@ -950,6 +1004,16 @@ static int vcnl4000_read_raw(struct iio_dev *indio_dev,
default:
return -EINVAL;
}
+ case IIO_CHAN_INFO_RESOLUTION:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ ret = vcnl4040_read_ps_resolution(data, val, val2);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
default:
return -EINVAL;
}
@@ -987,6 +1051,13 @@ static int vcnl4040_write_raw(struct iio_dev *indio_dev,
default:
return -EINVAL;
}
+ case IIO_CHAN_INFO_RESOLUTION:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ return vcnl4040_write_ps_resolution(data, val);
+ default:
+ return -EINVAL;
+ }
default:
return -EINVAL;
}
@@ -1035,6 +1106,16 @@ static int vcnl4040_read_avail(struct iio_dev *indio_dev,
default:
return -EINVAL;
}
+ case IIO_CHAN_INFO_RESOLUTION:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ *vals = (int *)vcnl4040_ps_resolutions;
+ *length = ARRAY_SIZE(vcnl4040_ps_resolutions);
+ *type = IIO_VAL_INT;
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
default:
return -EINVAL;
}
@@ -1808,10 +1889,12 @@ static const struct iio_chan_spec vcnl4040_channels[] = {
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) |
- BIT(IIO_CHAN_INFO_CALIBBIAS),
+ BIT(IIO_CHAN_INFO_CALIBBIAS) |
+ BIT(IIO_CHAN_INFO_RESOLUTION),
.info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) |
- BIT(IIO_CHAN_INFO_CALIBBIAS),
+ BIT(IIO_CHAN_INFO_CALIBBIAS) |
+ BIT(IIO_CHAN_INFO_RESOLUTION),
.ext_info = vcnl4000_ext_info,
.event_spec = vcnl4040_event_spec,
.num_event_specs = ARRAY_SIZE(vcnl4040_event_spec),
--
2.30.2
