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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/iio/potentiometer/tpl0102.c
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@@ -15,7 +15,7 @@
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15
 
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 struct tpl0102_cfg {
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 	int wipers;
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-	int max_pos;
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+	int avail[3];
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 	int kohms;
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 };
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21
 
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@@ -28,16 +28,16 @@
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 static const struct tpl0102_cfg tpl0102_cfg[] = {
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 	/* on-semiconductor parts */
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-	[CAT5140_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
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-	[CAT5140_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
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+	[CAT5140_503] = { .wipers = 1, .avail = { 0, 1, 255 }, .kohms = 50, },
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+	[CAT5140_104] = { .wipers = 1, .avail = { 0, 1, 255 }, .kohms = 100, },
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 	/* ti parts */
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-	[TPL0102_104] = { .wipers = 2, .max_pos = 256, .kohms = 100 },
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-	[TPL0401_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
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+	[TPL0102_104] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms = 100 },
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+	[TPL0401_103] = { .wipers = 1, .avail = { 0, 1, 127 }, .kohms = 10, },
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 };
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 struct tpl0102_data {
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 	struct regmap *regmap;
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-	unsigned long devid;
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+	const struct tpl0102_cfg *cfg;
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 };
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 static const struct regmap_config tpl0102_regmap_config = {
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@@ -52,6 +52,7 @@
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 	.channel = (ch),					\
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 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
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 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
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+	.info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW),	\
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 }
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 static const struct iio_chan_spec tpl0102_channels[] = {
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@@ -72,9 +73,27 @@
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 		return ret ? ret : IIO_VAL_INT;
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 	}
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 	case IIO_CHAN_INFO_SCALE:
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-		*val = 1000 * tpl0102_cfg[data->devid].kohms;
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-		*val2 = tpl0102_cfg[data->devid].max_pos;
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+		*val = 1000 * data->cfg->kohms;
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+		*val2 = data->cfg->avail[2] + 1;
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 		return IIO_VAL_FRACTIONAL;
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+	}
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+
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+	return -EINVAL;
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+}
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+
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+static int tpl0102_read_avail(struct iio_dev *indio_dev,
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+			      struct iio_chan_spec const *chan,
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+			      const int **vals, int *type, int *length,
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+			      long mask)
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+{
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+	struct tpl0102_data *data = iio_priv(indio_dev);
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+
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+	switch (mask) {
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+	case IIO_CHAN_INFO_RAW:
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+		*length = ARRAY_SIZE(data->cfg->avail);
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+		*vals = data->cfg->avail;
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+		*type = IIO_VAL_INT;
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+		return IIO_AVAIL_RANGE;
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 	}
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 	return -EINVAL;
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@@ -89,7 +108,7 @@
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 	if (mask != IIO_CHAN_INFO_RAW)
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 		return -EINVAL;
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-	if (val >= tpl0102_cfg[data->devid].max_pos || val < 0)
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+	if (val > data->cfg->avail[2] || val < 0)
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 		return -EINVAL;
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 	return regmap_write(data->regmap, chan->channel, val);
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@@ -97,6 +116,7 @@
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 static const struct iio_info tpl0102_info = {
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 	.read_raw = tpl0102_read_raw,
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+	.read_avail = tpl0102_read_avail,
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 	.write_raw = tpl0102_write_raw,
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 };
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@@ -113,17 +133,16 @@
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 	data = iio_priv(indio_dev);
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 	i2c_set_clientdata(client, indio_dev);
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-	data->devid = id->driver_data;
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+	data->cfg = &tpl0102_cfg[id->driver_data];
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 	data->regmap = devm_regmap_init_i2c(client, &tpl0102_regmap_config);
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 	if (IS_ERR(data->regmap)) {
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 		dev_err(dev, "regmap initialization failed\n");
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 		return PTR_ERR(data->regmap);
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 	}
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-	indio_dev->dev.parent = dev;
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 	indio_dev->info = &tpl0102_info;
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 	indio_dev->channels = tpl0102_channels;
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-	indio_dev->num_channels = tpl0102_cfg[data->devid].wipers;
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+	indio_dev->num_channels = data->cfg->wipers;
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 	indio_dev->name = client->name;
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 	return devm_iio_device_register(dev, indio_dev);