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iio: adc: ad7768-1: Add channel labels. 

For better identification of the channels.

Signed-off-by: Cristian Pop <cristian.pop@analog.com>
Link: https://lore.kernel.org/r/20200928090959.88842-3-cristian.pop@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Cristian Pop 2020-09-28 12:09:57 +03:00 committed by Jonathan Cameron
parent 3079188f82
commit 75ed0be720
1 changed files with 41 additions and 0 deletions
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41
drivers/iio/adc/ad7768-1.c
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@ -161,6 +161,7 @@ struct ad7768_state {
struct completion completion;
struct iio_trigger *trig;
struct gpio_desc *gpio_sync_in;
const char *labels[ARRAY_SIZE(ad7768_channels)];
/*
* 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,
};
@ -532,6 +542,33 @@ 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;
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;
@ -604,6 +641,10 @@ 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,