linux-kernel - [PATCH v2 06/10] iio: light: veml6030: use read

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Message-Id: <20240923-veml6035-v2-6-58c72a0df31c@gmail.com>
Date: Mon, 23 Sep 2024 00:17:54 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Jonathan Cameron <jic23@...nel.org>, 
 Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Rishi Gupta <gupt21@...il.com>
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH v2 06/10] iio: light: veml6030: use read_avail() for
 available attributes

Drop custom attributes by using the standard read_avail() callback to
read scale and integration time. When at it, define these attributes as
available by all channels, as they affect the values of both the ALS and
the WHITE channel.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/iio/light/veml6030.c | 64 +++++++++++++++++++++++++++++++-------------
 1 file changed, 45 insertions(+), 19 deletions(-)

diff --git a/drivers/iio/light/veml6030.c b/drivers/iio/light/veml6030.c
index 89c98bfc5191..a3190fab3add 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},
 };
 
 /*
@@ -197,9 +196,11 @@ static const struct iio_chan_spec veml6030_channels[] = {
 		.type = IIO_LIGHT,
 		.channel = CH_ALS,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
-				BIT(IIO_CHAN_INFO_PROCESSED) |
-				BIT(IIO_CHAN_INFO_INT_TIME) |
-				BIT(IIO_CHAN_INFO_SCALE),
+				BIT(IIO_CHAN_INFO_PROCESSED),
+		.info_mask_shared_by_all = 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),
 	},
@@ -210,6 +211,10 @@ static const struct iio_chan_spec veml6030_channels[] = {
 		.channel2 = IIO_MOD_LIGHT_BOTH,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 				BIT(IIO_CHAN_INFO_PROCESSED),
+		.info_mask_shared_by_all = 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),
 	},
 };
 
@@ -567,6 +572,27 @@ static int veml6030_read_raw(struct iio_dev *indio_dev,
 	}
 }
 
+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;
+	default:
+		return -EINVAL;
+	}
+}
+
 static int veml6030_write_raw(struct iio_dev *indio_dev,
 				struct iio_chan_spec const *chan,
 				int val, int val2, long mask)
@@ -684,19 +710,19 @@ 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