[PATCH v3 5/9] iio: light: veml6030: use read_avail() for available attributes

[Javier Carrasco <javier.carrasco.cruz@gmail.com>]

Drop custom attributes by using the standard read_avail() callback to
read scale and integration time. When at it, add the integration time
and scale attributes fro the WHITE channel, as they modify its value as
well. To avoid breaking the current ABI, these attributes must be kept
as separate for both channels even though they are shared under the
hood.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
---
 drivers/iio/light/veml6030.c | 82 +++++++++++++++++++++++++-------------------
 1 file changed, 47 insertions(+), 35 deletions(-)

diff --git a/drivers/iio/light/veml6030.c b/drivers/iio/light/veml6030.c
index 72c1988e48e6..fe6d2f9a2e01 100644
--- a/drivers/iio/light/veml6030.c
+++ b/drivers/iio/light/veml6030.c
@@ -58,25 +58,24 @@ struct veml6030_data {
 	int cur_integration_time;
 };
 
-/* Integration time available in seconds */
-static IIO_CONST_ATTR(in_illuminance_integration_time_available,
-				"0.025 0.05 0.1 0.2 0.4 0.8");
+static const int veml6030_it_times[][2] = {
+	{ 0, 25000 },
+	{ 0, 50000 },
+	{ 0, 100000 },
+	{ 0, 200000 },
+	{ 0, 400000 },
+	{ 0, 800000 },
+};
 
 /*
  * Scale is 1/gain. Value 0.125 is ALS gain x (1/8), 0.25 is
  * ALS gain x (1/4), 1.0 = ALS gain x 1 and 2.0 is ALS gain x 2.
  */
-static IIO_CONST_ATTR(in_illuminance_scale_available,
-				"0.125 0.25 1.0 2.0");
-
-static struct attribute *veml6030_attributes[] = {
-	&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
-	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
-	NULL
-};
-
-static const struct attribute_group veml6030_attr_group = {
-	.attrs = veml6030_attributes,
+static const int veml6030_scale_vals[][2] = {
+	{ 0, 125000 },
+	{ 0, 250000 },
+	{ 1, 0 },
+	{ 2, 0 },
 };
 
 /*
@@ -200,6 +199,8 @@ static const struct iio_chan_spec veml6030_channels[] = {
 				BIT(IIO_CHAN_INFO_PROCESSED) |
 				BIT(IIO_CHAN_INFO_INT_TIME) |
 				BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) |
+						     BIT(IIO_CHAN_INFO_SCALE),
 		.event_spec = veml6030_event_spec,
 		.num_event_specs = ARRAY_SIZE(veml6030_event_spec),
 	},
@@ -209,7 +210,11 @@ static const struct iio_chan_spec veml6030_channels[] = {
 		.modified = 1,
 		.channel2 = IIO_MOD_LIGHT_BOTH,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
-				BIT(IIO_CHAN_INFO_PROCESSED),
+				BIT(IIO_CHAN_INFO_PROCESSED) |
+				BIT(IIO_CHAN_INFO_INT_TIME) |
+				BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) |
+						     BIT(IIO_CHAN_INFO_SCALE),
 	},
 };
 
@@ -555,37 +560,44 @@ static int veml6030_read_raw(struct iio_dev *indio_dev,
 			return -EINVAL;
 		}
 	case IIO_CHAN_INFO_INT_TIME:
-		if (chan->type == IIO_LIGHT)
-			return veml6030_get_intgrn_tm(indio_dev, val, val2);
-		return -EINVAL;
+		return veml6030_get_intgrn_tm(indio_dev, val, val2);
 	case IIO_CHAN_INFO_SCALE:
-		if (chan->type == IIO_LIGHT)
-			return veml6030_get_als_gain(indio_dev, val, val2);
-		return -EINVAL;
+		return veml6030_get_als_gain(indio_dev, val, val2);
 	default:
 		return -EINVAL;
 	}
 }
 
+static int veml6030_read_avail(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       const int **vals, int *type, int *length,
+			       long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_INT_TIME:
+		*vals = (int *)&veml6030_it_times;
+		*length = 2 * ARRAY_SIZE(veml6030_it_times);
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		return IIO_AVAIL_LIST;
+	case IIO_CHAN_INFO_SCALE:
+		*vals = (int *)&veml6030_scale_vals;
+		*length = 2 * ARRAY_SIZE(veml6030_scale_vals);
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		return IIO_AVAIL_LIST;
+	}
+
+	return -EINVAL;
+}
+
 static int veml6030_write_raw(struct iio_dev *indio_dev,
 				struct iio_chan_spec const *chan,
 				int val, int val2, long mask)
 {
 	switch (mask) {
 	case IIO_CHAN_INFO_INT_TIME:
-		switch (chan->type) {
-		case IIO_LIGHT:
-			return veml6030_set_intgrn_tm(indio_dev, val, val2);
-		default:
-			return -EINVAL;
-		}
+		return veml6030_set_intgrn_tm(indio_dev, val, val2);
 	case IIO_CHAN_INFO_SCALE:
-		switch (chan->type) {
-		case IIO_LIGHT:
-			return veml6030_set_als_gain(indio_dev, val, val2);
-		default:
-			return -EINVAL;
-		}
+		return veml6030_set_als_gain(indio_dev, val, val2);
 	default:
 		return -EINVAL;
 	}
@@ -684,19 +696,19 @@ static int veml6030_write_interrupt_config(struct iio_dev *indio_dev,
 
 static const struct iio_info veml6030_info = {
 	.read_raw  = veml6030_read_raw,
+	.read_avail  = veml6030_read_avail,
 	.write_raw = veml6030_write_raw,
 	.read_event_value = veml6030_read_event_val,
 	.write_event_value	= veml6030_write_event_val,
 	.read_event_config = veml6030_read_interrupt_config,
 	.write_event_config	= veml6030_write_interrupt_config,
-	.attrs = &veml6030_attr_group,
 	.event_attrs = &veml6030_event_attr_group,
 };
 
 static const struct iio_info veml6030_info_no_irq = {
 	.read_raw  = veml6030_read_raw,
+	.read_avail  = veml6030_read_avail,
 	.write_raw = veml6030_write_raw,
-	.attrs = &veml6030_attr_group,
 };
 
 static irqreturn_t veml6030_event_handler(int irq, void *private)

-- 
2.43.0