Add the proximity multi pulse (PS_MPS) as oversampling_ratio.
Instead of one single pulse per every defined time frame,
one can program 2, 4, or even 8 pulses. This leads to a
longer IRED on-time for each proximity measurement value, which
also results in a higher detection range.
Add read/write attribute for proximity oversampling-ratio and read
attribute for available oversampling-ratio.
This is supported for vcnl4040 and vcnl4200.
Signed-off-by: Astrid Rost <astrid.rost@xxxxxxxx>
---
drivers/iio/light/vcnl4000.c | 84 ++++++++++++++++++++++++++++++++++++
1 file changed, 84 insertions(+)
diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index 4fd4d4ef5990..67d5d0e14bcd 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -61,6 +61,7 @@
#define VCNL4200_AL_CONF 0x00 /* Ambient light configuration */
#define VCNL4200_PS_CONF1 0x03 /* Proximity configuration */
+#define VCNL4200_PS_CONF3 0x04 /* Proximity configuration */
#define VCNL4040_PS_THDL_LM 0x06 /* Proximity threshold low */
#define VCNL4040_PS_THDH_LM 0x07 /* Proximity threshold high */
#define VCNL4040_ALS_THDL_LM 0x02 /* Ambient light threshold low */
@@ -90,6 +91,7 @@
#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_INT GENMASK(9, 8) /* Proximity interrupt mode */
+#define VCNL4040_PS_CONF3_MPS GENMASK(6, 5) /* Proximity multi pulse number */
#define VCNL4040_PS_IF_AWAY BIT(8) /* Proximity event cross low threshold */
#define VCNL4040_PS_IF_CLOSE BIT(9) /* Proximity event cross high threshold */
#define VCNL4040_ALS_RISING BIT(12) /* Ambient Light cross high threshold */
@@ -157,6 +159,7 @@ static const int vcnl4200_als_it_times[][2] = {
};
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};
#define VCNL4000_SLEEP_DELAY_MS 2000 /* before we enter pm_runtime_suspend */
@@ -778,6 +781,56 @@ static ssize_t vcnl4040_write_ps_period(struct vcnl4000_data *data, int val, int
return ret;
}
+static ssize_t vcnl4040_read_ps_oversampling_ratio(struct vcnl4000_data *data, int *val)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF3);
+ if (ret < 0)
+ return ret;
+
+ ret = FIELD_GET(VCNL4040_PS_CONF3_MPS, ret);
+
+ if (ret >= ARRAY_SIZE(vcnl4040_ps_oversampling_ratio))
+ return -EINVAL;
+
+ *val = vcnl4040_ps_oversampling_ratio[ret];
+
+ return ret;
+}
+
+static ssize_t vcnl4040_write_ps_oversampling_ratio(struct vcnl4000_data *data, int val)
+{
+ unsigned int i;
+ int ret, index = -1;
+ u16 regval;
+
+ for (i = 0; i < ARRAY_SIZE(vcnl4040_ps_oversampling_ratio); i++) {
+ if (val == vcnl4040_ps_oversampling_ratio[i]) {
+ index = i;
+ break;
+ }
+ }
+
+ if (index < 0)
+ return -EINVAL;
+
+ mutex_lock(&data->vcnl4000_lock);
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF3);
+ if (ret < 0)
+ goto out;
+
+ regval = (ret & ~VCNL4040_PS_CONF3_MPS) |
+ FIELD_PREP(VCNL4040_PS_CONF3_MPS, index);
+ ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF3,
+ regval);
+
+out:
+ 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)
@@ -828,6 +881,17 @@ static int vcnl4000_read_raw(struct iio_dev *indio_dev,
if (ret < 0)
return ret;
return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ ret = vcnl4040_read_ps_oversampling_ratio(data, val);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+
default:
return -EINVAL;
}
@@ -851,6 +915,13 @@ static int vcnl4040_write_raw(struct iio_dev *indio_dev,
default:
return -EINVAL;
}
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ return vcnl4040_write_ps_oversampling_ratio(data, val);
+ default:
+ return -EINVAL;
+ }
default:
return -EINVAL;
}
@@ -880,6 +951,16 @@ static int vcnl4040_read_avail(struct iio_dev *indio_dev,
}
*type = IIO_VAL_INT_PLUS_MICRO;
return IIO_AVAIL_LIST;
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ *vals = (int *)vcnl4040_ps_oversampling_ratio;
+ *length = ARRAY_SIZE(vcnl4040_ps_oversampling_ratio);
+ *type = IIO_VAL_INT;
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
default:
return -EINVAL;
}
@@ -1648,6 +1729,9 @@ static const struct iio_chan_spec vcnl4040_channels[] = {
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME),
.info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME),
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ .info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME) |
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.ext_info = vcnl4000_ext_info,
.event_spec = vcnl4040_event_spec,
.num_event_specs = ARRAY_SIZE(vcnl4040_event_spec),
--
2.30.2
