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Subject[PATCH v5] iio: adc: ad7768-1: Add channel label example
Date
This is a demo usage of new "label" attribute for channel.

Signed-off-by: Cristian Pop <cristian.pop@analog.com>
---
Changes in V5:
Create a separate patch file for this commit
drivers/iio/adc/ad7768-1.c | 49 ++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)

diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
index 0d132708c429..5ca9f9febb5a 100644
--- a/drivers/iio/adc/ad7768-1.c
+++ b/drivers/iio/adc/ad7768-1.c
@@ -161,6 +161,7 @@ struct ad7768_state {
struct completion completion;
struct iio_trigger *trig;
struct gpio_desc *gpio_sync_in;
+ const char **labels;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
@@ -407,6 +408,14 @@ static int ad7768_write_raw(struct iio_dev *indio_dev,
}
}

+static int ad7768_read_label(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, char *label)
+{
+ struct ad7768_state *st = iio_priv(indio_dev);
+
+ return sprintf(label, "%s\n", st->labels[chan->channel]);
+}
+
static struct attribute *ad7768_attributes[] = {
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
NULL
@@ -420,6 +429,7 @@ static const struct iio_info ad7768_info = {
.attrs = &ad7768_group,
.read_raw = &ad7768_read_raw,
.write_raw = &ad7768_write_raw,
+ .read_label = ad7768_read_label,
.debugfs_reg_access = &ad7768_reg_access,
};

@@ -538,6 +548,41 @@ static void ad7768_clk_disable(void *data)
clk_disable_unprepare(st->mclk);
}

+static int ad7768_set_channel_label(struct iio_dev *indio_dev,
+ int num_channels)
+{
+ struct ad7768_state *st = iio_priv(indio_dev);
+ struct device *device = indio_dev->dev.parent;
+ struct fwnode_handle *fwnode;
+ struct fwnode_handle *child;
+ const char *label;
+ int crt_ch = 0;
+
+ st->labels = devm_kcalloc(indio_dev->dev.parent,
+ num_channels,
+ sizeof(**st->labels),
+ GFP_KERNEL);
+
+ if (!st->labels)
+ return -ENOMEM;
+
+ fwnode = dev_fwnode(device);
+ fwnode_for_each_child_node(fwnode, child) {
+ if (fwnode_property_read_u32(child, "reg", &crt_ch))
+ continue;
+
+ if (crt_ch >= num_channels)
+ continue;
+
+ if (fwnode_property_read_string(child, "label", &label))
+ continue;
+
+ st->labels[crt_ch] = label;
+ }
+
+ return 0;
+}
+
static int ad7768_probe(struct spi_device *spi)
{
struct ad7768_state *st;
@@ -611,6 +656,10 @@ static int ad7768_probe(struct spi_device *spi)

init_completion(&st->completion);

+ ret = ad7768_set_channel_label(indio_dev, ARRAY_SIZE(ad7768_channels));
+ if (ret)
+ return ret;
+
ret = devm_request_irq(&spi->dev, spi->irq,
&ad7768_interrupt,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
--
2.17.1
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