Commit 40efeec7 authored by David Lechner's avatar David Lechner Committed by Jonathan Cameron
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staging: iio: resolver: ad2s1210: add label attribute support 



The ad2s1210 resolver driver has quite a few channels, mostly for
internal signals for event support. This makes it difficult to know
which channel is which. This patch adds a label attribute to the
channels to make it easier to identify them.

Signed-off-by: default avatarDavid Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20231005-ad2s1210-mainline-v4-15-ec00746840fc@baylibre.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 1638b6d4

drivers/staging/iio/resolver/ad2s1210.c

+29 −0
Original line number Diff line number Diff line
@@ -1158,6 +1158,34 @@ static int ad2s1210_initial(struct ad2s1210_state *st) 
	return ret;

}



static int ad2s1210_read_label(struct iio_dev *indio_dev,

			       struct iio_chan_spec const *chan,

			       char *label)

{

	if (chan->type == IIO_ANGL) {

		if (chan->channel == 0)

			return sprintf(label, "position\n");

		if (chan->channel == 1)

			return sprintf(label, "tracking error\n");

	}

	if (chan->type == IIO_ANGL_VEL)

		return sprintf(label, "velocity\n");

	if (chan->type == IIO_PHASE)

		return sprintf(label, "synthetic reference\n");

	if (chan->type == IIO_ALTVOLTAGE) {

		if (chan->output)

			return sprintf(label, "excitation\n");

		if (chan->channel == 0)

			return sprintf(label, "monitor signal\n");

		if (chan->channel == 1)

			return sprintf(label, "cosine\n");

		if (chan->channel == 2)

			return sprintf(label, "sine\n");

	}



	return -EINVAL;

}



static int ad2s1210_read_event_value(struct iio_dev *indio_dev,

				     const struct iio_chan_spec *chan,

				     enum iio_event_type type,
@@ -1338,6 +1366,7 @@ static const struct iio_info ad2s1210_info = { 
	.read_raw = ad2s1210_read_raw,

	.read_avail = ad2s1210_read_avail,

	.write_raw = ad2s1210_write_raw,

	.read_label = ad2s1210_read_label,

	.attrs = &ad2s1210_attribute_group,

	.read_event_value = ad2s1210_read_event_value,

	.write_event_value = ad2s1210_write_event_value,