[PATCH v4 3/4] iio: vcnl4000: Add sampling frequency support for VCNL4010/20.

Mathieu Othacehe
2020-04-21T07:55:50Z

Add sampling frequency support for proximity data on VCNL4010 and VCNL4020
chips.

Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>
---
drivers/iio/light/vcnl4000.c | 112 ++++++++++++++++++++++++++++++++++-
1 file changed, 111 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index db5c15541174..1e00a9666534 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -86,6 +86,19 @@
#define VCNL4010_INT_DRDY \
(BIT(VCNL4010_INT_PROXIMITY) | BIT(VCNL4010_INT_ALS))

+#define VCNL4010_PROXIMITY_SAMPLING_FREQUENCY_AVAILABLE \
+ "1.95 3.90 7.81 16.62 31.25 62.5 125 250"
+
+static const int vcnl4010_prox_sampling_frequency[][2] = {
+ {1, 950000},
+ {3, 906250},
+ {7, 812500},
+ {16, 625000},
+ {31, 250000},
+ {62, 500000},
+ {125, 0},
+ {250, 0}
+};

#define VCNL4000_SLEEP_DELAY_MS 2000 /* before we enter pm_runtime_suspend */

@@ -366,6 +379,24 @@ static int vcnl4200_measure_proximity(struct vcnl4000_data *data, int *val)
return vcnl4200_measure(data, &data->vcnl4200_ps, val);
}

+static int vcnl4010_read_proxy_samp_freq(struct vcnl4000_data *data, int *val,
+ int *val2)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, VCNL4010_PROX_RATE);
+ if (ret < 0)
+ return ret;
+
+ if (ret >= ARRAY_SIZE(vcnl4010_prox_sampling_frequency))
+ return -EINVAL;
+
+ *val = vcnl4010_prox_sampling_frequency[ret][0];
+ *val2 = vcnl4010_prox_sampling_frequency[ret][1];
+
+ return 0;
+}
+
static bool vcnl4010_in_periodic_mode(struct vcnl4000_data *data)
{
int ret;
@@ -459,11 +490,75 @@ static int vcnl4010_read_raw(struct iio_dev *indio_dev,

iio_device_release_direct_mode(indio_dev);
return ret;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ ret = vcnl4010_read_proxy_samp_freq(data, val, val2);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
default:
return -EINVAL;
}
}

+static int vcnl4010_write_proxy_samp_freq(struct vcnl4000_data *data, int val,
+ int val2)
+{
+ int i;
+ const int len = ARRAY_SIZE(vcnl4010_prox_sampling_frequency);
+
+ for (i = 0; i < len; i++) {
+ if (val <= vcnl4010_prox_sampling_frequency[i][0])
+ break;
+ }
+
+ if (i == len)
+ return -EINVAL;
+
+ return i2c_smbus_write_byte_data(data->client, VCNL4010_PROX_RATE, i);
+}
+
+static int vcnl4010_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ int ret;
+ struct vcnl4000_data *data = iio_priv(indio_dev);
+
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
+ /* Protect against event capture. */
+ if (vcnl4010_in_periodic_mode(data)) {
+ ret = -EBUSY;
+ goto end;
+ }
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ ret = vcnl4010_write_proxy_samp_freq(data, val, val2);
+ goto end;
+ default:
+ ret = -EINVAL;
+ goto end;
+ }
+ default:
+ ret = -EINVAL;
+ goto end;
+ }
+
+end:
+ iio_device_release_direct_mode(indio_dev);
+ return ret;
+}
+
static int vcnl4010_read_event(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
@@ -668,23 +763,38 @@ static const struct iio_chan_spec vcnl4010_channels[] = {
}, {
.type = IIO_PROXIMITY,
.scan_index = 0,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ),
.event_spec = vcnl4000_event_spec,
.num_event_specs = ARRAY_SIZE(vcnl4000_event_spec),
.ext_info = vcnl4000_ext_info,
},
};

+static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
+ VCNL4010_PROXIMITY_SAMPLING_FREQUENCY_AVAILABLE);
+
+static struct attribute *vcnl4010_attributes[] = {
+ &iio_const_attr_in_proximity_sampling_frequency_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group vcnl4010_attribute_group = {
+ .attrs = vcnl4010_attributes,
+};
+
static const struct iio_info vcnl4000_info = {
.read_raw = vcnl4000_read_raw,
};

static const struct iio_info vcnl4010_info = {
.read_raw = vcnl4010_read_raw,
+ .write_raw = vcnl4010_write_raw,
.read_event_value = vcnl4010_read_event,
.write_event_value = vcnl4010_write_event,
.read_event_config = vcnl4010_read_event_config,
.write_event_config = vcnl4010_write_event_config,
+ .attrs = &vcnl4010_attribute_group,
};

static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
--
2.26.0