iio: adc: ti-ads1015: Switch to read_avail

Replace sysfs attributes with read_avail() callback. This also permits
removal of ads1115_info, since the scale attribute tables are now part
of chip data.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20220328194725.149150-10-marex@denx.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ti-ads1015.c

@@ -81,6 +81,9 @@ struct ads1015_chip_data {
 	int				num_channels;
 	const struct iio_info		*info;
 	const int			*data_rate;
+	const int			data_rate_len;
+	const int			*scale;
+	const int			scale_len;
 	bool				has_comparator;
 };
 
@@ -108,10 +111,28 @@ static const int ads1115_data_rate[] = {
  * Translation from PGA bits to full-scale positive and negative input voltage
  * range in mV
  */
-static int ads1015_fullscale_range[] = {
+static const int ads1015_fullscale_range[] = {
 	6144, 4096, 2048, 1024, 512, 256, 256, 256
 };
 
+static const int ads1015_scale[] = {	/* 12bit ADC */
+	256, 11,
+	512, 11,
+	1024, 11,
+	2048, 11,
+	4096, 11,
+	6144, 11
+};
+
+static const int ads1115_scale[] = {	/* 16bit ADC */
+	256, 15,
+	512, 15,
+	1024, 15,
+	2048, 15,
+	4096, 15,
+	6144, 15
+};
+
 /*
  * Translation from COMP_QUE field value to the number of successive readings
  * exceed the threshold values before an interrupt is generated
@@ -166,6 +187,9 @@ static const struct iio_event_spec ads1015_events[] = {
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |		\
 				BIT(IIO_CHAN_INFO_SCALE) |	\
 				BIT(IIO_CHAN_INFO_SAMP_FREQ),	\
+	.info_mask_shared_by_all_available =			\
+				BIT(IIO_CHAN_INFO_SCALE) |	\
+				BIT(IIO_CHAN_INFO_SAMP_FREQ),	\
 	.scan_index = _addr,					\
 	.scan_type = {						\
 		.sign = 's',					\
@@ -189,6 +213,9 @@ static const struct iio_event_spec ads1015_events[] = {
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |		\
 				BIT(IIO_CHAN_INFO_SCALE) |	\
 				BIT(IIO_CHAN_INFO_SAMP_FREQ),	\
+	.info_mask_shared_by_all_available =			\
+				BIT(IIO_CHAN_INFO_SCALE) |	\
+				BIT(IIO_CHAN_INFO_SAMP_FREQ),	\
 	.scan_index = _addr,					\
 	.scan_type = {						\
 		.sign = 's',					\
@@ -470,7 +497,7 @@ static int ads1015_set_data_rate(struct ads1015_data *data, int chan, int rate)
 {
 	int i;
 
-	for (i = 0; i < ARRAY_SIZE(ads1015_data_rate); i++) {
+	for (i = 0; i < data->chip->data_rate_len; i++) {
 		if (data->chip->data_rate[i] == rate) {
 			data->channel_data[chan].data_rate = i;
 			return 0;
@@ -480,6 +507,32 @@ static int ads1015_set_data_rate(struct ads1015_data *data, int chan, int rate)
 	return -EINVAL;
 }
 
+static int ads1015_read_avail(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      const int **vals, int *type, int *length,
+			      long mask)
+{
+	struct ads1015_data *data = iio_priv(indio_dev);
+
+	if (chan->type != IIO_VOLTAGE)
+		return -EINVAL;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		*type = IIO_VAL_FRACTIONAL_LOG2;
+		*vals =  data->chip->scale;
+		*length = data->chip->scale_len;
+		return IIO_AVAIL_LIST;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*type = IIO_VAL_INT;
+		*vals = data->chip->data_rate;
+		*length = data->chip->data_rate_len;
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
 static int ads1015_read_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan, int *val,
 			    int *val2, long mask)
@@ -828,60 +881,20 @@ static const struct iio_buffer_setup_ops ads1015_buffer_setup_ops = {
 	.validate_scan_mask = &iio_validate_scan_mask_onehot,
 };
 
-static IIO_CONST_ATTR_NAMED(ads1015_scale_available, scale_available,
-	"3 2 1 0.5 0.25 0.125");
-static IIO_CONST_ATTR_NAMED(ads1115_scale_available, scale_available,
-	"0.1875 0.125 0.0625 0.03125 0.015625 0.007813");
-
-static IIO_CONST_ATTR_NAMED(ads1015_sampling_frequency_available,
-	sampling_frequency_available, "128 250 490 920 1600 2400 3300");
-static IIO_CONST_ATTR_NAMED(ads1115_sampling_frequency_available,
-	sampling_frequency_available, "8 16 32 64 128 250 475 860");
-
-static struct attribute *ads1015_attributes[] = {
-	&iio_const_attr_ads1015_scale_available.dev_attr.attr,
-	&iio_const_attr_ads1015_sampling_frequency_available.dev_attr.attr,
-	NULL,
-};
-
-static const struct attribute_group ads1015_attribute_group = {
-	.attrs = ads1015_attributes,
-};
-
-static struct attribute *ads1115_attributes[] = {
-	&iio_const_attr_ads1115_scale_available.dev_attr.attr,
-	&iio_const_attr_ads1115_sampling_frequency_available.dev_attr.attr,
-	NULL,
-};
-
-static const struct attribute_group ads1115_attribute_group = {
-	.attrs = ads1115_attributes,
-};
-
 static const struct iio_info ads1015_info = {
+	.read_avail	= ads1015_read_avail,
 	.read_raw	= ads1015_read_raw,
 	.write_raw	= ads1015_write_raw,
 	.read_event_value = ads1015_read_event,
 	.write_event_value = ads1015_write_event,
 	.read_event_config = ads1015_read_event_config,
 	.write_event_config = ads1015_write_event_config,
-	.attrs          = &ads1015_attribute_group,
-};
-
-static const struct iio_info ads1115_info = {
-	.read_raw	= ads1015_read_raw,
-	.write_raw	= ads1015_write_raw,
-	.read_event_value = ads1015_read_event,
-	.write_event_value = ads1015_write_event,
-	.read_event_config = ads1015_read_event_config,
-	.write_event_config = ads1015_write_event_config,
-	.attrs          = &ads1115_attribute_group,
 };
 
 static const struct iio_info tla2024_info = {
+	.read_avail	= ads1015_read_avail,
 	.read_raw	= ads1015_read_raw,
 	.write_raw	= ads1015_write_raw,
-	.attrs          = &ads1015_attribute_group,
 };
 
 static int ads1015_client_get_channels_config(struct i2c_client *client)
@@ -1128,14 +1141,20 @@ static const struct ads1015_chip_data ads1015_data = {
 	.num_channels	= ARRAY_SIZE(ads1015_channels),
 	.info		= &ads1015_info,
 	.data_rate	= ads1015_data_rate,
+	.data_rate_len	= ARRAY_SIZE(ads1015_data_rate),
+	.scale		= ads1015_scale,
+	.scale_len	= ARRAY_SIZE(ads1015_scale),
 	.has_comparator	= true,
 };
 
 static const struct ads1015_chip_data ads1115_data = {
 	.channels	= ads1115_channels,
 	.num_channels	= ARRAY_SIZE(ads1115_channels),
-	.info		= &ads1115_info,
+	.info		= &ads1015_info,
 	.data_rate	= ads1115_data_rate,
+	.data_rate_len	= ARRAY_SIZE(ads1115_data_rate),
+	.scale		= ads1115_scale,
+	.scale_len	= ARRAY_SIZE(ads1115_scale),
 	.has_comparator	= true,
 };
 
@@ -1144,6 +1163,9 @@ static const struct ads1015_chip_data tla2024_data = {
 	.num_channels	= ARRAY_SIZE(tla2024_channels),
 	.info		= &tla2024_info,
 	.data_rate	= ads1015_data_rate,
+	.data_rate_len	= ARRAY_SIZE(ads1015_data_rate),
+	.scale		= ads1015_scale,
+	.scale_len	= ARRAY_SIZE(ads1015_scale),
 	.has_comparator	= false,
 };