[PATCH 1/2] iio: proximity: vcnl3020: add proximity rate

[Ivan Mikhaylov <i.mikhaylov@yadro.com>]

Add the proximity rate optional option and handling of it for
vishay vcnl3020.

Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
---
 drivers/iio/proximity/vcnl3020.c | 123 ++++++++++++++++++++++++++++++-
 1 file changed, 120 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/proximity/vcnl3020.c b/drivers/iio/proximity/vcnl3020.c
index 37264f801ad0..833c5d5ac0a1 100644
--- a/drivers/iio/proximity/vcnl3020.c
+++ b/drivers/iio/proximity/vcnl3020.c
@@ -40,6 +40,17 @@
 #define VCNL_ON_DEMAND_TIMEOUT_US	100000
 #define VCNL_POLL_US			20000
 
+static const int vcnl3020_prox_sampling_frequency[][2] = {
+	{1, 950000},
+	{3, 906250},
+	{7, 812500},
+	{16, 625000},
+	{31, 250000},
+	{62, 500000},
+	{125, 0},
+	{250, 0},
+};
+
 /**
  * struct vcnl3020_data - vcnl3020 specific data.
  * @regmap:	device register map.
@@ -75,12 +86,37 @@ static u32 microamp_to_reg(u32 *val)
 	return *val /= 10000;
 };
 
+static u32 hz_to_reg(u32 *val)
+{
+	unsigned int i;
+	int index = -1;
+
+	for (i = 0; i < ARRAY_SIZE(vcnl3020_prox_sampling_frequency); i++) {
+		if (*val == vcnl3020_prox_sampling_frequency[i][0]) {
+			index = i;
+			break;
+		}
+	}
+
+	*val = index;
+	if (index < 0)
+		*val = 0;
+
+	return *val;
+};
+
 static struct vcnl3020_property vcnl3020_led_current_property = {
 	.name = "vishay,led-current-microamp",
 	.reg = VCNL_LED_CURRENT,
 	.conversion_func = microamp_to_reg,
 };
 
+static struct vcnl3020_property vcnl3020_proximity_rate_property = {
+	.name = "vishay,proximity-rate-hz",
+	.reg = VCNL_PROXIMITY_RATE,
+	.conversion_func = hz_to_reg,
+};
+
 static int vcnl3020_get_and_apply_property(struct vcnl3020_data *data,
 					   struct vcnl3020_property prop)
 {
@@ -125,8 +161,18 @@ static int vcnl3020_init(struct vcnl3020_data *data)
 	data->rev = reg;
 	mutex_init(&data->lock);
 
-	return vcnl3020_get_and_apply_property(data,
-					       vcnl3020_led_current_property);
+	rc = vcnl3020_get_and_apply_property(data,
+					     vcnl3020_led_current_property);
+	if (rc) {
+		goto err_prop_set;
+	}
+
+	rc = vcnl3020_get_and_apply_property(data,
+					     vcnl3020_proximity_rate_property);
+
+err_prop_set:
+
+	return rc;
 };
 
 static int vcnl3020_measure_proximity(struct vcnl3020_data *data, int *val)
@@ -165,10 +211,50 @@ static int vcnl3020_measure_proximity(struct vcnl3020_data *data, int *val)
 	return rc;
 }
 
+static int vcnl3020_read_proxy_samp_freq(struct vcnl3020_data *data, int *val,
+					 int *val2)
+{
+	int rc;
+	unsigned int prox_rate;
+
+	rc = regmap_read(data->regmap, VCNL_PROXIMITY_RATE, &prox_rate);
+	if (rc)
+		return rc;
+
+	if (prox_rate >= ARRAY_SIZE(vcnl3020_prox_sampling_frequency))
+		return -EINVAL;
+
+	*val = vcnl3020_prox_sampling_frequency[prox_rate][0];
+	*val2 = vcnl3020_prox_sampling_frequency[prox_rate][1];
+
+	return 0;
+}
+
+static int vcnl3020_write_proxy_samp_freq(struct vcnl3020_data *data, int val,
+					  int val2)
+{
+	unsigned int i;
+	int index = -1;
+
+	for (i = 0; i < ARRAY_SIZE(vcnl3020_prox_sampling_frequency); i++) {
+		if (val == vcnl3020_prox_sampling_frequency[i][0] &&
+		    val2 == vcnl3020_prox_sampling_frequency[i][1]) {
+			index = i;
+			break;
+		}
+	}
+
+	if (index < 0)
+		return -EINVAL;
+
+	return regmap_write(data->regmap, VCNL_PROXIMITY_RATE, index);
+}
+
 static const struct iio_chan_spec vcnl3020_channels[] = {
 	{
 		.type = IIO_PROXIMITY,
-		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SAMP_FREQ),
 	},
 };
 
@@ -185,13 +271,44 @@ static int vcnl3020_read_raw(struct iio_dev *indio_dev,
 		if (rc)
 			return rc;
 		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		rc = vcnl3020_read_proxy_samp_freq(data, val, val2);
+		if (rc < 0)
+			return rc;
+		return IIO_VAL_INT_PLUS_MICRO;
 	default:
 		return -EINVAL;
 	}
 }
 
+static int vcnl3020_write_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      int val, int val2, long mask)
+{
+	int rc;
+	struct vcnl3020_data *data = iio_priv(indio_dev);
+
+	rc = iio_device_claim_direct_mode(indio_dev);
+	if (rc)
+		return rc;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		rc = vcnl3020_write_proxy_samp_freq(data, val, val2);
+		goto end;
+	default:
+		rc = -EINVAL;
+		goto end;
+	}
+
+end:
+	iio_device_release_direct_mode(indio_dev);
+	return rc;
+}
+
 static const struct iio_info vcnl3020_info = {
 	.read_raw = vcnl3020_read_raw,
+	.write_raw = vcnl3020_write_raw,
 };
 
 static const struct regmap_config vcnl3020_regmap_config = {
-- 
2.26.2